Water Heater
Workshop Manual
Thermo S 160
Thermo S 230
Thermo S 300
Thermo S 350
Thermo S 400
with Control Unit 1586
Status: 12/2012
Ident.-no. 11114913B II
Thermo S 160/230/300/350/400
1
Introduction
1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
1.6
2
Electrical components
Fuel
201
201
Burner
Combustion air fan
Fuel pump
Nozzle block preheater
Control unit
Electronic ignition unit with ignition electrodes
Temperature sensors with water temperature sensor and integrated overheating protection
Heat exchanger
Combustion chamber
Circulating pump
Aquavent 5000 (U4814) and Aquavent 5000S (U4854) circulating pumps
Aquavent 6000C (U4855) and Aquavent 6000SC (U4856) circulating pumps
Fuel filter
302
302
302
303
303
304
304
305
306
307
307
308
308
Heater functions
4.1
4.2
4.2.1
4.2.2
4.2.3
4.3
4.3.1
4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4
4.6
4.6.1
4.7
5
101
101
101
101
101
101
102
102
105
105
105
105
Assemblies and components descriptions
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.2
3.3
3.4
3.4.1
3.4.2
3.5
4
Content and purpose
Workshop manual validity
Meaning of highlighted content
Additional applicable documentation
Installation and safety regulations
Legal installation regulations
Installation regulations for railway vehicles
General safety regulations
Combustion air supply
Exhaust line
Adapter wiring harness
Suggestions for Improvement and change
Technical data
2.1
2.2
3
1 Introduction
General heater functionality description
Operational heater sequence
Switching on and start
Heating operation
Switching off
Diagnosis interface and STT-diagnosis
Test plug
Malfunction interlock and heater interlock
Malfunction interlock
Malfunctions during switching-on and start procedure
Malfunctions during heater operation
Malfunctions during run-down
Malfunction interlock release and error clearance
Heater interlock
Heater interlock release
Error output
401
402
402
402
403
405
405
406
406
406
406
407
407
407
407
408
Troubleshooting and error correction
5.1
General
501
1
1 Introduction
5.2
5.3
5.4
5.4.1
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.5.7
5.5.8
5.5.9
5.5.10
5.5.11
5.5.12
5.5.13
5.5.14
6
General
601
General
Heater servicing
Servicing
CO2 content adjustment
701
701
701
702
Burner, components and heater removal and installation
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
8.13
8.14
8.14.1
8.14.2
2
501
503
505
505
505
507
508
509
509
509
510
510
510
510
511
512
512
512
513
514
515
516
517
518
519
Servicing
7.1
7.1.1
7.2
7.2.1
8
General error symptoms
Malfunction code output via flash code
Error symptoms during functional tests with malfunction code output or diagnosis
Error symptom "No start within safety period"
Error symptom "Flame interruption"
Error symptom "Low voltage"
Error symptom "Extraneous light detected prior to ignition or during run-down"
Error symptom "Flame detector defective"
Error symptoms "Temperature sensor / overheating protection defective" and "Overheating"
Error symptom "Circulating pump interruption"
Individual component tests
General visual inspection
Heat exchanger visual inspection
Combustion chamber visual inspection
Resistance check of the temperature sensor with integrated overheating protection
Adapter wiring harness inspection
Fan and combustion air intake line visual inspection
Burner motor inspection
Electronic ignition unit inspection
Ignition electrode inspection
Flame detector inspection
Fuel pump inspection
Solenoid valve inspection
Nozzle block preheater inspection
Circulating pump inspection
Schematic diagrams
6.1
7
Thermo S 160/230/300/350/400
General
Burner removal and installation
Removal and installation of the temperature sensor with integrated overheating protection
Hood removal and installation
Combustion air fan removal and installation
Electronic ignition unit and ignition electrode removal and installation
Control unit removal and installation
Fuel pump removal and installation
Solenoid valve removal and installation
Atomiser nozzle removal and installation
Combustion chamber removal and installation
Heat exchanger removal and installation
Heater removal and installation
Start-up after burner or heater installation
Bleeding of the fuel system
Bleeding of the water circulation
801
802
803
803
804
806
808
808
810
810
811
811
811
812
812
812
Thermo S 160/230/300/350/400
9
1 Introduction
Modifications and retrofits
10 Packing / storage
and shipping
10.1
General
1001
Appendix A 1
Periodic heater maintenance
A-2
3
1 Introduction
4
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
1
Introduction
1.1
Content and purpose
This workshop manual is used to support personnel
briefed and/or trained by Spheros during
maintenance and repair of water heaters Thermo
S 160, S 230, S 300, S 350 and S 400.
1.2
Workshop manual validity
The workshop manual applies to heaters listed on the title
page of this document.
It may be subjected to modifications and amendments.
The respectively currently valid version is binding.
This version can be found on the Spheros homepage
under Service / Technical Documents.
1.3
Meaning of highlighted content
In this manual sections highlighted with CAUTION,
ATTENTION and NOTE have the following meaning:
CAUTION
This caption is used, if improper adherence or nonadherence to instructions or procedures may cause injuries
or fatal accidents.
ATTENTION
This caption is used, if improper adherence or nonadherence to instructions or procedures may cause
component damage.
NOTE
This caption is used, if a distinctive feature is pointed out.
1.4
Additional applicable documentation
We recommend the use of additional documentation.
References are provided in the workshop manual at
appropriate locations.
The following documents can be consulted during
operation and maintenance of the heaters listed on the
title page:
• Operating instruction
• Installation instruction
• Technical communications
• Technical information
• Spare parts list
1 Introduction
1.5
Installation and safety regulations
1.5.1 Legal installation regulations
For the heaters exist type approvals according to the ECE
Regulations
R10 (EMC):
No. 03 5266 and
R122 (Heater) No. 00 0208 for Thermo S 160
No. 00 0226 for Thermo S 230
No. 00 0227 for Thermo S 300
No. 00 0228 for Thermo S 350
No. 00 0225 for Thermo S 400
Installation is governed above all by the provisions in
Annex 7 of the ECE Regulation R122.
NOTE
The provisions of these Regulations are binding within the
territory governed by ECE Regulations and should
similarly be observed in countries without specific
regulations.
(Extract from ECE Regulation R122, Annex 7)
4. The heater must have a manufacturer’s label showing
the manufacturer’s name, the model number and type
together with its rated output in kilowatts. The fuel type
must also be stated and, where relevant, the operating
voltage and gas pressure.
7.1. A clearly visible tell-tale in the operator’s field of view
shall inform when the combustion heater is switched on or
off.
(Extract from ECE Regulation R122, Part I)
5.3 Vehicle Installation Requirements for
Combustion Heaters
5.3.1 Scope
5.3.1.1 Subject to paragraph 5.3.1.2., combustion
heaters shall be installed according to the requirements of
paragraph 5.3.
5.3.1.2 Vehicles of category O having liquid fuel heaters
are deemed to comply with the requirements of paragraph
5.3.
5.3.2 Positioning of combustion heater
5.3.2.1 Body sections and any other components in the
vicinity of the heater must be protected from excessive
heat and the possibility of fuel or oil contamination.
5.3.2.2 The combustion heater shall not constitute a risk
of fire, even in the case of overheating. This requirement
shall be deemed to be met if the installation ensures an
adequate distance to all parts and suitable ventilation, by
the use of fire resistant materials or by the use of heat
shields.
5.3.2.3 In the case of M2 and M3 vehicles, the combustion
heater must not be positioned in the passenger
101
1 Introduction
compartment. However, an installation in an effectively
sealed envelope which also complies with the conditions
in paragraph 5.3.2.2. may be used.
5.3.2.4 The label referred to in Annex 7, paragraph 1.4.,
or a duplicate, must be positioned so that it can be easily
read when the heater is installed in the vehicle.
5.3.2.5 Every reasonable precaution should be taken in
positioning the heater to minimize the risk of injury and
damage to personal property.
5.3.3 Fuel supply
5.3.3.1 The fuel filler must not be situated in the
passenger compartment and must be provided with an
effective cap to prevent fuel spillage.
5.3.3.2 In the case of liquid fuel heaters, where a supply
separate from that of the vehicle is provided, the type of
fuel and its filler point must be clearly labelled.
5.3.3.3 A notice, indicating that the heater must be shut
down before refuelling, must be affixed to the fuelling
point. In addition a suitable instruction must be included in
the manufacturer’s operating manual.
5.3.4 Exhaust system
Thermo S 160/230/300/350/400
spare parts. This will result in the invalidation of the type
approval for the heater and therefore of its ECE Type
Approval.
CAUTION
At petrol stations and other fuel filling facilities the heater
must be switched off due to the explosion hazard. To
advice to this requirement the self-adhesive label with the
text ’’Switch off heater before refueling!“, delivered with
each heater, is to be affixed next to the filler neck.
1.5.2 Installation regulations for railway
vehicles
For heater models Thermo S 230 / 300 / 350 / 400 Rail a
design certification acc. to § 33 EBO (= Federal Railway
Authority) has been issued with the following approval
number: EBA 32AZ3/0006/10.
Particular attention must be given to incidental provision
1.6 of the design certification:
Should the manufacturer, operator or service technician
gain knowledge of any accidents and damage (caused by
fire, explosion, escape of Diesel fuel or heating oil EL) that
may have occurred despite proper use of the heater, he is
required to immediately notify the certifying body thereof.
5.3.4.1 The exhaust outlet must be located so as to
prevent emissions from entering the vehicle through
ventilators, heated air inlets or opening windows.
1.5.3 General safety regulations
5.3.5 Combustion air inlet
"General safety regulations" beyond the scope of these
regulations are listed below.
5.3.5.1 The air for the combustion chamber of the heater
must not be drawn from the passenger compartment of
the vehicle.
5.3.5.2 The air inlet must be so positioned or guarded that
blocking by rubbish or luggage is unlikely.
5.3.6 Heating air inlet
not applicable
5.3.7 Heating air outlet
not applicable
5.3.8 Automatic control of the heating system
5.3.8.1 The heating system must be switched off
automatically and the supply of fuel must be stopped
within five seconds when the vehicle’s engine stops
running. If a manual device is already activated, the
heating system can stay in operation.
ATTENTION
Failure to follow the installation instructions and the notes
contained therein will lead to all liability being refused by
Spheros. The same applies if repairs are carried out
incorrectly or with the use of parts other than genuine
102
General accident prevention regulations must be
observed.
The safety regulations must be observed during
operation, maintenance and repair of heaters of the
Thermo S series.
For heaters in vehicles, which are not subjected to the
European Directive, inspection and approval by the
respective inspection authority is required, if applicable
regulations are in place.
The year of first start-up must be permanently marked
on the type plate by removal of not applicable dates.
The heaters are registered and licensed for the use in
vehicles according to the respective EU Directive 70/156/
ECC (e.g. 2001/56/EC). When using the heater for other
applications not subjected to this EU Directive (e.g. ships),
respective applicable regulations must be fulfilled.
ATTENTION
The heaters are not approved for vehicles subjected to
Directive 94/55/EC (ADR).
The heater may only be installed in the driver's cab or
passenger compartment, if an installation box is used,
which can be tightly sealed vs. the vehicle interior. The
installation box must be sufficiently vented from the
outside.
Thermo S 160/230/300/350/400
If the temperature within the installation box exceeds the
permissible ambient temperature of the heater, the
venting opening must be increased after consultation with
Spheros.
ATTENTION
Prior to opening the heater it must be disconnected
from the vehicle electrical system.
NOTE
The heater should always be disconnected from the
vehicle electrical system prior to disconnecting the
temperature sensor plug.
If the order is reversed, the heater will automatically be
interlocked.
Prior to removing the burner from the heat exchanger,
the temperature sensor plug must be removed.
ATTENTION
A temperature of 110°C may not be exceeded in the
heater areas (storage temperature).
Exceeding the temperature may cause heater
malfunctions and permanent damage to the
electronics.
Electrical cables must be routed avoiding isolation
damage (e.g. by pinching, heat development,
bending, fraying, etc.).
1 Introduction
CAUTION
If operated without coolant (overheating!), the heaters
outer enclosure may reach the ignition temperature of
diesel fuel during operation!
Dripping or evaporating fuel should not accumulate
or ignite on hot parts or electrical equipment.
The heater should be installed as low as possible to
ensure automatic venting of heater and circulating pump.
This in particular applies for the circulating pump, which
does not automatically draw.
After coolant replacement sufficient purging of the cooling
system must be ensured. Insufficient venting during
heating operation can cause malfunctions due to
overheating.
Proper venting can be recognised by almost noise-free
operation of the circulating pump.
The opening pressure in the vehicle cooling system,
usually indicated on the cooler lid, may not exceed 2.0 bar
working overpressure (also applies to separate heating
circulations).
Hose connections must be secured with hose clamps
against slipping.
ATTENTION
The tightening torques of the used hose clamps must be
observed.
CAUTION
For risk of poisoning and suffocation the heater may
not be used in closed rooms such as garages or
workshops without exhaust fume extraction. This
also applies when pre-set times/timers are used. This
also applies for burner operation during adjustment
of the CO2 content in the exhaust fumes.
For explosion risk the heater must be switched off at
gas stations and gas systems.
For explosion risk the heater must be switched off,
when combustible fumes or dust can be generated
(e.g. in the proximity of fuel, coal, wood dust, grain
storage/silos or similar).
ATTENTION
The heaters may only be installed in horizontal
position.
103
1 Introduction
Thermo S 160/230/300/350/400
Water heating circulation system - wall heater and roof channel heater
1
2
3
4
5
6
7
8
9
Wall heater with fan
Heat exchanger at the entrance
Heater
Circulation pump
Roof heat exchanger
Vehicle engine
Shut-off valve
Driver seat heater
Control element
Supply
Return
Fig. 101 Heater installation example in a bus
Coolant level verification and cooling system purging
must be performed according to the vehicle
manufacturer's specifications. The coolant in the heating
circulation system should contain at least 20 % of an antifreezing agent recommended by the vehicle
manufacturer.
The anti-freezing agent content should not exceed 60 %.
If a shut-off fitting is installed in the return line, an
information plate must be installed at a well visible
location.
Fuel hoses may not be bent or twisted during installation.
In order to avoid sagging, they should secured using
clamps in 25 cm distances.
Fuel lines must be protected against temperature
exposure.
Permissible fuel line dimensions must be obtained from
the installation instruction.
Fig. 102 Information plate
104
Thermo S 160/230/300/350/400
1 Introduction
1.5.4 Combustion air supply
1.5.6 Adapter wiring harness
The combustion air intake opening may not point into
driving direction. It should be arranged to effectively avoid
contaminations as well as snow plastering and splash
water intake. Furthermore the combustion air intake
opening should be protected against object penetration by
installing a grid or other suitable measures.
ATTENTION
Do not put strain on the adapter wiring harness or adapter
plugs installed for testing purposes.
Combustion air intake and exhaust fume outlet must be
arranged to ensure that no air pressure difference (e.g.
suction) will occur in any vehicle operating condition.
Permissible dimensions of the optional, applicationdepending combustion air intake line must be obtained
from the installation instruction.
1.5.5 Exhaust line
The exhaust pipe must be secured to the heater using
e.g. a clamp.
Condensation water accumulations must be drained.
If necessary, a condensation water drain hole with a
diameter of Ø 4 must be implemented.
1.6
Suggestions for Improvement
and change
Please direct any complaints, improvement or
modification suggestions regarding this manual to:
service@spheros.de
Permissible dimensions of the optional, applicationdepending exhaust line must be obtained from the
installation instruction.
The heater exhaust pipe port may not be partially or
completely obstructed by leafs, soil, snow, mud, etc. (this
may occur when the vehicle is driving in reverse). The
exhaust pipe port may not point into driving direction.
Combustion air intake and exhaust fume outlet must be
arranged to ensure that no air pressure difference (e.g.
suction) will occur in any vehicle operating condition.
If the exhaust line is installed in close proximity to
temperature-sensitive parts, then it must be
insulated.
If exhaust fumes exit downwards under the vehicle,
exhaust gas deflection is absolutely necessary.
105
1 Introduction
106
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
2
2 Technical data
Technical data
Unless limiting values are defined, the technical data
should be understood with tolerances of ±10% common
for heaters at an ambient temperature of +20° C and at
nominal voltage.
Table 201 Technical data
Heater
ECE type permit number E1 122R 00
Design
Heat flow rate (at 20°C ambient temperature)
Fuel
Fuel consumption
Nominal voltage
Operating voltage range
Electrical power consumption at 24 V *
Max. permissible combustion air intake temperature
Permissible ambient temperature during operation
Permissible storage temperature
Permissible operating overpressure
Heat exchanger filling volume
Minimum water flow **
Minimum circulation volume
CO2 in exhaust at nominal voltage
Heater dimensions (tolerance ± 3 mm)
Weight
kW
(kcal/h)
kg/h
V=
V=
W
°C
°C
°C
bar
l
l/h
l
Vol %
mm
kg
Thermo S 160 Thermo S 230 Thermo S 300 Thermo S 350 Thermo S 400
0208
0226
0227
0228
0225
High-pressure atomizer
16
23
30
35
40
(13 800)
(20 000)
(26 000)
(30 000)
(34 000)
Diesel / light fuel oil
1.6
2.5
3.0
3.6
4.1
24
20...30
50
65
90
120
180
+ 85
-40...+ 100
-40...+ 110
max. 2.0
1.8
1400
1900
2400
2700
3200
10.0
9.5 + 1.5
Length 600 / Width 247 / Height 220
18.4
18.8
* without circulating pump
Max. continuous current of the circulating pump 10 A, maximum peak current for 0.5 s duration = 90 A - We recommend the use of Spheros circulation pumps for
highest efficiency and reliability. In order to reduce starting currents the circulating pump can be synchronized by the control unit for a short time period during activation.
Confirm compatibility in case pumps provided by different manufacturers are used!
** Minimum water flow at coolant temperatures above 50°C
Below 50°C a lower water flow is permitted, if the occurence of vapor bubbles due to local overheating safely can be excluded.
2.1
Electrical components
Control unit, circulating pump, solenoid valve, electronic
ignition and the digital timer are designed for 24V nominal
voltage. Motor nozzle block preheater and temperature
sensor voltages are controlled by the control unit.
NOTE
Recirculating pumps must be assigned to the heaters
according to the flow resistance in the coolant circulation
system. Voltages directly applied to the burner motor for
testing purposes may not exceed 12 V.
2.2
–
–
–
Fuel
Only fuels listed on the type plate as well as fuels
approved by Spheros may be used. The fuel use
limitations in the heater listed below must be observed.
– Diesel fuel according to DIN EN 590 and DIN 51628: The
limitations of use of the standard apply, hence winter
diesel down to - 20°C, Arctic diesel down to - 40°C
– Light fuel oil according to DIN 51603 (above 0°C)
– Bio diesel fuel according to DIN EN 14214: 0 .. - 5 °C
without preheating system, -10 .. - 15 °C with nozzle
–
–
block preheater and heated fuel filter (use limitations
depending on fuel quality).
Diesel -water emulsions: 0 .. - 5 °C without preheating
system, - 10 .. - 15 °C with nozzle block preheater and
heated fuel filter (use limitations depending on fuel
quality/water content).
100% Paraffin: - 10°C with nozzle block preheater and
heated fuel filter, the use of lubrication-improving
additives is recommended.
Mixture of 70 Vol-% diesel fuel (winter diesel)
according to DIN EN 590 or DIN 51628 and 30 Vol-%
Bio diesel according to DIN EN 14214: - 5 .. - 10 °C
without preheating system, - 15°C with nozzle block
preheater and heated fuel filter (use limitations
depending on fuel quality).
Mixture of 75 Vol-% diesel fuel (winter diesel) according
to DIN EN 590 or DIN 51628 and 25 Vol-% vegetable oil
(rapeseed oil): 0 .. - 5 °C without preheating system,
- 5 .. - 10 °C with nozzle block preheater and heated fuel
filter (use limitations depending on fuel quality).
Mixture of 75 Vol-% diesel fuel according to DIN EN
590 or DIN 51628 and 25 Vol-% ethanol:
0 .. - 5 °C without preheating system, -5 .. - 10 °C with
with nozzle block preheater and heated fuel filter
201
2 Technical data
ATTENTION
The listed temperature ranges, hence minimum
permissible temperatures strongly depend on the
respective fuel quality. In case of bad-quality fuel the
use limitations may deviate, e.g. in case of too high
water content.
At temperatures below 0°C commercially available winter
diesel should be used. This especially applies for fuel
extraction from a separate fuel tank.
The use of lubrication and flow improving additives is
permitted. No negative impact is known at time of the
preparation of this workshop manual.
ATTENTION
When fuels are used, their respective limitations of
use must be observed and appropriate measures
(nozzle block preheater, electrically heated filter)
must be applied as needed.
In case fuel is extracted from the vehicle tank, the
vehicle manufacturer's mixing regulations shall apply.
202
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
3
3 Assemblies and components
Assemblies and components
descriptions
The Spheros Thermo S 160, S 230, S 300, S 350 and
S 400 water heater systems are used in conjunction with
the vehicle heating system
–
–
–
Heat is generated by combustion of liquid fuels. The heat
it transferred to a coolant circulation system via the
heater's heat exchanger. Intermittent operation adjusts
the heater to changing heat demand (cyclic operation).
The control unit controls heater activation and
deactivation based on the temperature sensor signals.
The heaters of the Thermo S series mainly consist of the
following main components:
to heat the passenger compartment
to defrost the windows
to preheat water-cooled vehicle engines.
The water heater operates independently from the vehicle
engine and is connected to the cooling system, the fuel
system and the electrical system of the vehicle. It is bolted
down to the vehicle chassis or is secured using an
additional cross beam.
–
–
–
Burner
Combustion chamber
Heat exchanger
A circulating pump is externally installed in the system, or
for compact devices directly on the heater.
4
3
2
Version for additional
sensor
5
1
10
6
7
12
9
11
13
8
1
2
3
4
Burner
Coolant, intake
Sensor plug
Temperature sensor with
integrated overheating protection
5 Coolant, outlet
6
7
8
9
10
11
Heat exchanger
Exhaust outlet
Fuel, return
Combustion air, intake
Fuel, flow
Splashguard
(screen alternative)
12 Screen
13 Hot air elbow
(incl. adapter)
(screen alternative)
301
3 Assemblies and components
3.1
Burner
3.1.2 Fuel pump
The burner consists of components
•
•
•
•
•
•
•
•
Thermo S 160/230/300/350/400
Burner motor
Combustion air fan
Fuel pump with solenoid valve and atomiser nozzle
Electronic ignition unit with ignition electrode
Nozzle block preheater, optional
Control unit with flame detector
Disc with inspection glass
Adapter wiring harness as interface to the
temperature sensor system
3.1.1 Combustion air fan
The fuel pump is responsible for fuel supply.
The pump is driven by the burner motor via a coupling.
Fuel is compressed in the fuel pump to approx. 10 bar and
atomised via the atomiser nozzle.
The solenoid valve integrated into the fuel pump opens
and closes the fuel supply to the atomiser nozzle.
Three different fuel pumps are assigned to the different
heating capacity classes of the Thermo S series.
These are identified by the heating capacity class
specification as well as colour dots:
•
•
•
16 KW:
23-35 KW:
40 KW:
The combustion air fan transports the air required for
combustion from the combustion air intake to the
combustion chamber.
1 colour dot
2 colour dots
3 colour dots
Solenoid valve
Nozzle block
preheater (optional)
The combustion air fan consists of burner motor, fan and
motor cross member. Air is drawn in through the air intake
opening in the hood. The air intake opening is equipped
with a splashguard, a protective screen and a hot air
elbow.
Motor cross member
Coupling with
magnets
Screen
Burner motor
O-ring
Fuel pump
Shaft
circlip
Fan
Two different motors are assigned to the different heating
capacity classes of the Thermo S series. The respective
heating capacity classes are indicated on the motor. In
addition the motors are differentiated by colour.
• 16 kW - 30 KW: Motor housing
colour:
silver
•
302
35 kW - 40 KW: Motor housing
colour:
black
Colour dots for
identification
of the heating
capacity class
Thermo S 160/230/300/350/400
The fuel pump can be used in dual-line operation (fuel
supply and return line).
If the heater is operated with
–
–
–
–
a long fuel supply line
check valves in the fuel supply and return line
a fuel filter in the fuel supply line
single-line operation
the fuel supply line must be filled prior to first heater startup (see 8.14.1).
3 Assemblies and components
3.1.4 Control unit
The control unit 1586 ensures the operating sequence
and burner operation monitoring.
The flame detector is integrated into the control unit.
Different control units are assigned to the different heating
capacity classes.
The control units are assigned via the ID number and the
performance class indicated on the type plate of the
control unit.
3.1.3 Nozzle block preheater
In case of very low temperatures fuel may exhibit severely
modified viscosity. Due to insufficient fuel atomisation
functional heater malfunctions may occur.
Depending on the fuel used, these temperatures vary.
When used in cold regions or if fuels different from diesel
fuel are used, we recommend the use of a nozzle block
preheater.
The nozzle block preheater consists of a heating element
with an integrated temperature sensor.
At a temperature of < 5°C the heating element heats the
nozzle holder and thus, fuel and atomizer nozzle. Fuel
viscosity is reduced and atomisation improved.
The control unit defines the preheating time depending on
vehicle electrical system voltage and starting temperature.
Type plate with
ID number and
heating capacity
class identification
Control unit 1586
The use of the nozzle block preheater is optional. It is
possible to retrofit this capability without modifications to
the control unit.
Flame detector
Heating element
Nozzle block preheater
3.1.4.1 Flame detector
The flame detector monitors the flame conditions during
heater operation.
The fame detector is a photo transistor, which changes its
resistance as a function of flame luminous intensity and
thus, the voltage applied.
303
3 Assemblies and components
Electronic ignition unit
Disc
Thermo S 160/230/300/350/400
3.1.6 Temperature sensors with water
temperature sensor and integrated
overheating protection
The water temperature sensor captures the coolant
temperature at the heat exchanger outlet as electrical
resistance.
This signal is transmitted to the control unit, where it is
processed.
Flame detector
Window
3.1.5 Electronic ignition unit with ignition
electrodes
The overheating protection integrated into the temperature
sensor is responsible for temperature limitation.
Similar to the water temperature sensor, the coolant
temperature is captured at the heat exchanger outlet as
electrical resistance and transmitted to the control unit.
Overheating protection prevents inadmissibly high heater
operating temperatures.
At a temperature greater than 125°C heater deactivation
and interlocking is initiated.
It is not necessary to manually reset the overheating
protection.
Temperature
sensor
The electronic ignition unit induces the high voltage
required for ignition of the fuel-air mixture. Ignition is
triggered by a high voltage spark, which is initiated on the
ignition electrode.
Ignition electrode
3.1.6.1 Adapter wiring harness
Electronic ignition unit
304
It is possible to disconnect the temperature sensor plug
from the adapter wiring harness. Thus, the hood does not
need to be removed for burner head removal.
Thermo S 160/230/300/350/400
3.2
3 Assemblies and components
Heat exchanger
The heat exchanger transfers the heat generated by
combustion to the coolant circulation system.
Depending on the system integration a heat exchanger
with or without thread in the coolant inlet socket can be
installed.
Coolant inlet
Coolant outlet
Exhaust outlet
305
3 Assemblies and components
3.3
Thermo S 160/230/300/350/400
Combustion chamber
The combustion chamber is used for generation and
combustion of the fuel air mixture. The generated exhaust
gas heats the coolant flowing through the heat exchanger.
23 - 35 KW
Welding seam
Swirl plate
16 KW
Combustion chamber
Identification
of the heating
capacity class
Three different combustion chambers are used for heaters
of the Thermo S series. Deviating from the standard
combustion chamber variant for Thermo S 230, S 300 and
S 350, the Thermo S 160 is equipped with a combustion
chamber with a sheet metal swirler and the Thermo S 400
is equipped with a burner pipe with increased wall
thickness (1.5 mm).
40 KW
The combustion chambers of Thermos S 160 and Thermo
S 400 are each fitted with a stamping to distinguish the
individual combustion chambers.
NOTE
If possible, the combustion chamber should be inserted
into the heat exchanger in such a way, that the burner
pipe welding seam is between 60° and 300° in the lower
area.
At the same time it must be ensured that none of the
4 cut-outs of the combustion-chamber head points
vertically downwards (see figure on the right).
It is permissible to change the position during maintenance
or after combustion chamber replacement vs. the previous
installation position.
Cut-out positions
on the combustion
chamber head
in installed condition
306
Thermo S 160/230/300/350/400
3.4
3 Assemblies and components
Circulating pump
Nominal voltage
Operating voltage
range
Nominal power
consumption
Weight
l/h
V=
V=
W
kg
U 4814
Aquavent
5000
5000
(against 0.2
bar)
12
or
24
10…14
or
20…28
104
2.1
U 4854
Aquavent
5000S
5000
(against 0.2 bar)
24
20…28
104
2.2
U 4855
Aquavent
6000C
6000
(against 0.4 bar)
24
20…28
210
2.4
U 4856
Aquavent
6000SC
6000
(against 0.4 bar)
24
20…28
210
2.5
Circulating pump
Flow rate
The externally arranged circulating pump ensures coolant
transport within the vehicle and/or heater circulation
system.
Depending on the application, the circulating pump is
switched on via the control unit or directly via the vehicle
electrical system and operated during the entire heater
operation duration.
Heaters can be operated with Aquavent 5000 (U4814),
Aquavent 5000S (U4854), Aquavent 6000C (U4855) or
Aquavent 6000SC (U4856) circulating pumps.
The safety device of the circulating pump may never be
pulled, while the pump is running, and may not be
replaced, when the pump is switched on.
Aquavent 5000
(U4814)
Aquavent 5000S
(U4854)
Aquavent 6000C
(U4855)
Aquavent 6000SC
(U4856)
3.4.1 Aquavent 5000 (U4814) and Aquavent
5000S (U4854) circulating pumps
The Aquavent 5000 (U4814) and 5000S (U4854)
circulating pumps are equipped with a brush motor.
NOTE
Aquavent 5000 (U4814) with floating-ring type shaft seal.
Aquavent 5000S (U4854) magnetic drive (no seal)
ATTENTION
The circulating pump motor is not equipped with an
internal inverse-polarity protection.
307
3 Assemblies and components
3.4.2 Aquavent 6000C (U4855) and Aquavent
6000SC (U4856) circulating pumps
The Aquavent 6000C (U4855) and
Aquavent 6000SC (U4856) circulating pumps are
equipped with a brushless motor.
NOTE
The Aquavent 6000C (U4855) has a floating-ring type
shaft seal.
The Aquavent 6000SC (U4856) is equipped wit a
magnetic coupling (no seal)
Soft start
The circulating pump motor starts slowly and gently. Max.
rotational speed is only reached after approx. 5 seconds.
Protection against dry running
Protection against dry running is integrated into the
circulating pump motor.
If the circulating pump motor consumes within a time
period of approx. 45 minutes significantly less current, dry
running is detected. The circulating pump motor is
switched off.
After approx. 2 minutes and circulating pump motor
reactivation, the operation can be continued.
Blocking protection
If the pump wheel is blocked, the motor will be switched
off via the error mode directly prior to standstill of the
pump wheel.
Overload protection
Overload protection is activated after the soft start is
completed. The current consumption will be limited.
In case of hydraulic overpressuring of the circulating
pump, the circulating pump motor will not be damaged.
Error mode
In case of malfunctions the circulating pump motor is
switched off via the error mode. After approx. 5 seconds
the error mode switches the circulating pump motor into
energy-saving sleep mode.
Sleep mode
In sleep mode internal electronics consumers of the
circulating pump motor are switched off.
Reactivation of the circulating pump motor
It is possible to reactivate the circulating pump motor from
sleep mode. For this purpose the power supply is
disconnected for > 2 min. After the power supply is
reconnected, the circulating pump motor restarts in softstart mode.
308
Thermo S 160/230/300/350/400
Inverse-polarity protection
The circulating pump motor is not equipped with an
internal inverse-polarity protection.
3.5
Fuel filter
A heatable fuel filter is available as an option. The
temperature switch switches the integrated filter heating
on at a temperature of ≤ 0.5 ± 2.5 °C and switches it off at
a temperature of ≥ 5.5 ± 2.5 °C.
Thermo S 160/230/300/350/400
4
Heater functions
4.1
General heater functionality
description
The heater principle is based on a high-pressure atomizer
burner and is monitored by an integrated control unit.
The burner motor powers the fan and the fuel pump. The
fuel pump is coupled to the motor using a plastic coupling.
The fan produces the required combustion air, the combustion
air volume is impacted by the burner motor speed.
The speed is monitored by a sensor in the control unit, which
analyses the changing magnetic field of the magnets in the coupling.
The speed required for the CO2-content is determined during
first calibration at Spheros and is stored in the control unit.
In a maintenance event the workshop can adjust the CO2setting using the STT diagnosis (Spheros-Thermo-TestDiagnosis) (see 4.2).
The fuel pressure is generated in the fuel pump and reduced
to the required pressure using a pressure limiting valve.
A solenoid valve releases the fuel via the atomizer nozzle
for combustion in the combustion chamber.
As an option, the fuel pump can be equipped with a nozzle
block preheater. The nozzle block preheater heats the
nozzle holder with the atomizer nozzle at low temperatures,
and thus the fuel. The fuel air mixture is ignited in the
combustion chamber via a high-voltage ignition spark.
The flame is monitored by a flame detector integrated into
4 Heater functions
the control unit.
Depending on the equipment, the heater is switched on
and off using a
• digital timer
• switch
• or climate control.
During heating operation the burner is automatically
switched on and off. The heater is switched on, when the
temperature falls short of a lower temperature threshold,
and is switched off, if the upper temperature threshold is
reached (see table 401).
The switching thresholds depend on the heater variant
and the heating operation type. They cannot be changed
and are programmed into the control unit.
For overheating protection of the heater the switching
thresholds are modified by the control unit, if specified
temperature gradients are exceeded.
If the specified minimum burning duration is not reached,
the switching thresholds will be reduced. This protects the
heater against sooting of the heat exchanger.
An operating display is available for monitoring the operating
status. A flame indication can be optionally installed.
The operating display is also used to output error
messages in flash code.
It is also possible to read the flash code via the two-pin
plug in the heater wiring harness (see 4.7 and 5.3).
Use max. 2W lamps.
Table 401 Standard switching thresholds
Standard
Lower switching threshold: auxiliary heating in °C
78
Upper switching threshold: auxiliary heating in °C
85
Lower switching threshold: normal mode parking heating in °C
70
Upper switching threshold: normal mode parking heating in °C
85
Lower switching threshold: saving mode 1 parking
heating in °C
55
Upper switching threshold: saving mode 1 parking
heating in °C
70
Lower switching threshold: saving mode 2 parking
heating in °C
45
Upper switching threshold: saving mode 2 parking
heating in °C
60
NOTE
Switching thresholds may deviate
per customer.
401
4 Heater functions
4.2
Thermo S 160/230/300/350/400
Operational heater sequence
Signals
off
on
Terminal 61
off (parking heating)
T < T_min
UPFA off
off (parking heating)
T >= T_max
T < T_min
Flame
generation
T >= T_max
Flame
generation
T > T_min T < T_min
UPFA on
Coolant temperature
off
on (auxiliary heating)
Flame
generation
Main switch
Actuators
Operating display
Flame display
Combustion air motor
Circulating pump
Electronic ignition unit
Solenoid valve
90
0..108 12
1
0..15
5
...
30
90
Run-down 2
30
Run-down with safety period
...
Stabilisation
5
Ignition
0..15
Pre-ignition
1
Run-down 2
0..108 12
Run-down with safety period
90
Stabilisation
30
Ignition
...
Pre-ignition
5
Run-down 2
0..15
Run-down with safety period
1
Stabilisation
0..108 12
Ignition
Time in s
Pre-ignition
Nozzle block preheater
OFF
Standby
Start
Heating
Rundown
Standby
Start
Heating
Rundown
Standby
Initial cycle with light check
Optional nozzle block
preheating
Initial cycle with light check
Optional nozzle block
preheating
Initial cycle with light check
Optional nozzle block
preheating
Look for
State
Start
Heating
Rundown
Off
Fig. 403 Operational sequence
4.2.1 Switching on and start
When switched on, the operating display is illuminated,
the control unit starts controlled operation and checks the
coolant temperature.
If the coolant temperature is below the upper temperature
threshold, the initial cycle starts.
Combustion air fan and circulating pump are switched on.
After approx. 12 seconds (initial cycle time) the highvoltage spark is ignited. Approx. 1 second later the
solenoid valve in the fuel pump is opened.
The fuel injected via the atomizer nozzle and mixed with
the air of the combustion air fan, is ignited by the ignition
spark and burned in the combustion chamber.
The flame is monitored by a flame detector integrated into
the control unit.
A few seconds after a flame is detected, the control unit
switches the electronic ignition unit off. Until then the
flame is stabilised. The heater is not yet in heating mode.
With optional nozzle block preheater:
The integrated temperature sensor determines the
temperature on the nozzle holder as soon as the initial
cycle starts. Starting at a temperature of < 5°C the nozzle
block preheater is switched on. Depending on the
determined temperature and the vehicle electrical system
402
voltage the preheating time is determined. The duty cycle
is limited to a maximum of 120 seconds.
The burner motor does not run during the entire
preheating time. It starts latest 12 seconds prior to
expiration of the determined preheating time during initial
cycle.
The initial cycle time can be extended to a maximum of
120 seconds.
The further sequence takes place as described.
4.2.2 Heating operation
After the flame is stabilised, the heater is in controlled
(normal) operation.
Depending on the coolant temperature, the coolant
temperature is maintained at one level by switching the
burner alternately on and off.
Once the upper switching threshold is exceeded, heating
operation is finished and run-down initiated.
The solenoid valve is closed, the flame expires, however the
combustion air fan and circulating pump continue running.
The run-down ends approx. after 120 seconds. The
combustion air fan is switched off.
The heater is in a controlled break.
The operating display is illuminated.
Thermo S 160/230/300/350/400
4 Heater functions
Once the temperature falls short of the lower switching
threshold, the heater restarts burner operation. It runs
through the same sequence as the switching-on
sequence.
4.2.2.3 Gradient evaluation
Different switching thresholds are defined for different
heater operating modes.
The switching thresholds are selected depending on the
present condition and the selected heating operation.
The following switching thresholds may be applied.
The control unit recognises the quick temperature
increase and automatically sets the upper switching
threshold to a lower value.
The quicker the temperature increases, the lower the
switching threshold for starting the controlled break is set.
In addition, the burner is also switched back on again after
the controlled break at a lower switching threshold.
•
•
•
•
Parking heating mode and auxiliary heating mode
Gradient evaluation
Minimum combustion period (also called hysteresis
adaptation)
Saving mode 1 and saving mode 2
The switching thresholds can be obtained from Table 401.
4.2.2.1 Auxiliary heating mode and parking
heating mode
The control unit received the information, whether the
vehicle engine is running or not, from terminal D+/+61.
If terminal D+/+61 is connected and the vehicle engine is
running, the switching thresholds in auxiliary heating
mode are higher than in parking heating mode with the
engine not running.
In that case a saving mode is activated in parking heating
operation.
If terminal D+/+61 is not connected, then there is no
distinction. The heater always runs in parking heating
operation.
4.2.2.2 Saving modes
Two different saving modes are programmed in the
control unit.
Saving mode 1 and saving mode 2 exist (see table 401).
In saving mode 1 the switching thresholds are higher than
in saving mode 2.
If saving mode is activated, the controlled temperatures in
the heating system are maintained at a low temperature
level. The lower and upper switching threshold are
reduced.
Due to lower radiation loss the fuel consumption can be
reduced for a lower heat demand (e.g. warmer mode).
The heater burner output is not reduced.
In case of low coolant flow or poor coolant circuit venting
the temperature quickly increases in heating operation.
This prevents residual heat triggering the overheating
protection.
4.2.2.4 Minimum combustion period
A minimum burner combustion period of 120 second is
targeted.
For ambient and operating conditions this target is not
always achieved.
In order to achieve the minimum combustion period, the
lower switching threshold is variably adjusted by the
control unit.
This process is also called hysteresis adaptation and is
applied in parking heating operation as well as auxiliary
heating operation.
If the combustion period falls short of the minimum
combustion period, the lower switching value is lowered
by 1K for the following combustion process.
The upper switching threshold remains as is.
This can be repeated until the minimum combustion
period is reached or the lower switching threshold is
reduced by 5K.
Further lowering is not possible.
Following a combustion process, where the required
minimum combustion period was reached, the lower
switching value is reset to its original value.
4.2.3 Switching off
Switching the heater off ends the combustion process.
The operating display expires and run-down is initiated.
The solenoid valve closes, the flame expires, the
combustion air fan and circulating pump continue running.
The run-down ends approx. after 120 seconds. The
combustion air fan is switched off.
In auxiliary heating mode (signal from terminal D+/+61)
saving mode is automatically deactivated (see 4.1).
403
4 Heater functions
If a malfunction occurs during run-down (e.g. flame
detection), the run-down may be shorter than 120 seconds.
During run-down it is permitted to switch the heater
back on. The burner will restart after a run-down time
of 30 seconds and subsequent initial cycle time.
404
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
4.3
Diagnosis interface and STT-diagnosis
Heaters of the Thermo S series support diagnosis
capabilities. Using the SST diagnosis adapter, SST
diagnosis and a PC, the heaters in a vehicle can be
checked. For this purpose the SST diagnosis adapter is
connected to the diagnosis interface in the heater wiring
harness, and to a PC.
Next, SST diagnosis is started on the PC and the
connection to the heater control unit is established.
4 Heater functions
4.3.1 Test plug
For tests using the "Component test" menu of SST
diagnosis, the temperature sensor "A" plug must be
replaced with a test plug.
24V
24V
BUSY
BUSY
PC
PC
SSpphheer roos sTThheer rmmooTTees st t
ca.
3m
approx.
3Kabel
m cable
A
Thermo
Thermo SS
zum
Fahrzeug
to vehicle
Heater wiring harness
Fig. 404 SST diagnosis connection to the heater
NOTE
For protection against moisture and contamination ensure
that the diagnosis interface is sealed using protective
caps, if not in use.
The latest SST diagnosis software can be found in the
Internet on the Spheros homepage under Service /
Technical Documents.
405
4 Heater functions
4.4
Malfunction interlock and heater
interlock
Malfunction interlocks and heater interlocks are
distinguished.
Each malfunction interlock and heater interlock is stored
in the control unit.
The heater should be protected against thermal loads.
Thermal loads can be triggered by:
•
•
•
Coolant flow too low
Coolant circuit not or only partially filled /
dry overheating.
Circulating pump failure.
The control unit software detects overheating.
Overheating is also detected by hardware (overheating
protection), independently from software.
4.5
Malfunction interlock
Thermo S 160/230/300/350/400
Malfunction criteria:
• Short circuit and/or interruption of electrical
components:
– Burner motor (stops immediately)
– Circulating pump
– Electronic ignition unit
– Optional nozzle block preheater
• Flame or extraneous light detection by the flame
detector prior to ignition of the high-voltage ignition
spark.
• No start: No flame detection within 15 seconds
after opening the solenoid valve.
• Temperature sensor delivers unacceptable
temperature values.
• Heater operation outside the permissible temperature
range.
• Burner motor speed signal faulty.
• Voltage falling short of the low voltage threshold of
approx. 20.5 V at motor start or within a duration of 20
seconds after a heating request.
• Voltage exceeding the high voltage threshold of approx.
30 V at motor start or within a duration of 6 seconds (rundown only, no malfunction interlock).
If one of the malfunctions listed below occurs, the heater
will initiate a fault shut-down, followed by malfunction
interlock.
4.5.2 Malfunctions during heater operation
Depending on the error timing, no run-down or a 120 seconds
run-down will be executed.
Flash impulses are outputted via the operating display
and the interface in the heater wiring harness (see 5.3).
NOTE
In case of malfunctions during heater operation, a
120 seconds run-down will be executed first. Subsequently
the heater status is switched to malfunction interlock.
If the circulating pump is externally actuated, it will
continue operating.
In case of several sequential malfunction interlocks a
heater interlock is initiated (see 4.6).
4.5.1 Malfunctions during switching-on and
start procedure
NOTE
If malfunctions occur during switching-on or during the
start process prior to ignition, the heater will be switched
off without run-down.
The heater is in malfunction interlock.
The motor stops immediately or does not start.
If the circulating pump is externally actuated, it will
continue operating.
406
Malfunction criteria:
• Short circuit and/or interruption of electrical
components:
– Burner motor (stops immediately)
– Circulating pump.
• Water temperature greater than the upper switching
threshold.
• Temperature sensor delivers unacceptable
temperature values.
• Heater operation outside the permissible temperature
range.
• Burner motor speed signal faulty.
• Flame interruption (combustion interruption for longer
than 15 seconds).
• Voltage falling short of the low voltage threshold of
approx. 20.5 V at motor start or within a duration of
20 seconds after a heating request.
• Voltage exceeding the high voltage threshold of approx.
30 V at motor start or within a duration of 6 seconds (rundown is applied, but no malfunction interlock).
• Reaching the max. number of shortfalls of the
minimum combustion duration.
• Control unit malfunction.
Thermo S 160/230/300/350/400
4.5.3 Malfunctions during run-down
NOTE
If the circulating pump is externally actuated, it will
continue operating.
Malfunction causes:
• Short circuit and/or interruption of electrical components:
– Burner motor (stops immediately)
– Circulating pump.
• Heater operation outside the permissible temperature
range.
• Motor speed signal faulty.
• Voltage falling short of the low voltage threshold of
approx. 20.5 V at motor start or within a duration of
20 seconds after a heating request.
• Voltage exceeding the high voltage threshold of approx.
30 V at motor start or within a duration of 6 seconds
(run-down is applied, but no malfunction interlock).
• Control unit malfunction.
4.5.4 Malfunction interlock release and error
clearance
The malfunction interlock is released when the heater is
switched off.
After that it will be immediately ready for operation.
The detected error is stored in the error memory and can
be read using SST diagnosis.
It is possible to delete the stored error using SST
diagnosis (see 4.3).
4.6
Heater interlock
4 Heater functions
Heater interlock causes:
• Short circuit and/or interruption of electrical
components:
– Solenoid valve
– Flame detector
– Overheating protection
– Water temperature sensor.
• Flame not expired within 30 seconds after run-down
started. (Burner motor stops).
• Overheating protection triggered.
• Control unit error or programming error.
• Repeated malfunctions.
• Repeated flame interruptions.
4.6.1 Heater interlock release
NOTE
The heater interlock timing must be observed!
Was the heater interlock triggered within 120 seconds
(e.g. in case of maintenance or repair activities) or after
more than 120 seconds.
The release procedure depends on the interlock timing.
The procedure is also different if the release
performed with or without SST diagnosis.
Temperature sensor, overheating protection errors or
errors causing overheating cause a heater interlock
in software and hardware.
Thus, the interlock must be released in software and
hardware.
For this purpose the heater must be disconnected
from the vehicle electrical system twice.
The heater interlock overrides the standard
malfunction interlock.
If the heater interlock is active, neither start nor run-down
are executed after switching the heater back on.
Prior to restarting the heater troubleshooting must be
performed by personnel trained by Spheros in order to
identify the root cause.
After that the heater interlock can be released (see 4.6.1).
Here it is differentiated between interlocks caused by
overheating and interlocks caused by other errors.
NOTE
If malfunctions occur during switching-on or during the
start process prior to ignition, the heater will be switched
off without run-down.
The heater is in heater interlock state.
The burner motor stops immediately or does not start.
Besides that a run-down between 30 seconds and 60 seconds
is performed depending on error type and timing.
Subsequently the heater status is switched to heater interlock.
If the circulating pump is externally actuated, it will
continue operating.
407
4 Heater functions
Thermo S 160/230/300/350/400
4.6.1.1 Release of a heater interlock triggered by the
temperature sensors
4.6.1.2 Release of a heater interlock triggered by
other malfunctions using SST diagnosis
If the heater interlock was triggered less than
120 seconds ago:
1. Switch interlocked heater off.
2. Correct the cause of the heater interlock.
3. Clear the error using SST diagnosis.
Procedure with and without SST diagnosis
1. Correct the cause of the heater interlock.
2. Switch interlocked heater on.
3. Disconnect the switched on heater from the vehicle
electrical system.
With SST diagnosis
4. Switch interlocked heater off.
5. Connect the switched off heater to the vehicle
electrical system.
6. Clear the error using SST diagnosis.
Without SST diagnosis
4. Connect the switched on heater to the vehicle
electrical system.
Note: The heater automatically starts after connecting it to
the vehicle electrical system.
The heater can be switched off in (pre-)flow.
If the heater interlock was triggered more than
120 seconds ago:
Procedure with and without SST diagnosis
1. Correct the cause of the heater interlock.
2. Switch interlocked heater on.
3. Disconnect the switched on heater for > 10 seconds
from the vehicle electrical system.
4. Connect the switched on heater to the vehicle
electrical system.
5. Within 120 seconds disconnect the switched on
heater again from the vehicle electrical system.
With SST diagnosis
6. Switch interlocked heater off.
7. Reconnect the switched off heater
to the vehicle electrical system.
8. Clear the error using SST diagnosis.
Without SST diagnosis
6. Reconnect the switched on heater
to the vehicle electrical system.
Note: The heater automatically starts after connecting it
to the vehicle electrical system.
The heater can be switched off in (pre-)flow.
408
4.6.1.3 Release of a heater interlock triggered by
other malfunctions not using SST diagnosis
1. Correct the cause of the heater interlock.
2. Switch interlocked heater on.
3. Disconnect the switched on heater for > 10 seconds
from the vehicle electrical system.
4. Connect the switched on heater to the vehicle
electrical system.
5. Within 120 seconds disconnect the switched on
heater again from the vehicle electrical system.
6. Reconnect the switched on heater
to the vehicle electrical system.
Note: The heater automatically starts after connecting it to
the vehicle electrical system.
The heater can be switched off in (pre-)flow.
4.7
Error output
If the heater is equipped with the standard timer, an error
output is displayed on the digital timer after a malfunction
occurs.
It is also possible to output an error via flash code.
An error is outputted this way via the operating display or
via the two-pin plug in the heater wiring harness (see 5.3).
Furthermore it is possible to output an error via SST
diagnosis (see 4.3).
Thermo S 160/230/300/350/400
5
Troubleshooting and error correction
5.1
General
This section describes troubleshooting and error
correction for Thermo S 160, S 230, S 300, S 350 and
S 400 heaters.
ATTENTION
Troubleshooting and error correction may only be
performed by briefed personnel.
In case of doubt functional connections can be obtained in
chapters 3 and 4.
Error detection is usually limited to localizing the faulty
component.
The following malfunction causes are not taken into
account and should basically always be verified and/or a
malfunction due to these reasons should be excluded:
5 Troubleshooting and error correction
•
•
•
•
•
•
Corrosion on plugs
Loose plug connections
Crimp failures on plugs and/or pins
Corrosion on cable and fuses
Corrosion on battery terminals
Cable insulation damage
ATTENTION
Prior to replacing a fuse troubleshooting needs to be
performed. The heater must be disconnected from the
vehicle electrical system and the fuse must switch into
currentless state.
A properly dimensioned fuse must be inserted (see
chapter 6 Schematic diagrams).
After each error correction a functional test must be
performed in the vehicle.
5.2
General error symptoms
The following table lists possible, general error symptoms.
Table 501: General error symptoms
Error symptom
Possible cause
Error in the electronics
Operating display is not illuminated and the heater does
not function.
•
•
•
No supply voltage.
Fuses.
Supply cable to the plug contacts of plug A of the
control unit.
Fuse F2 triggered.
Short circuit in the circulating pump or in the
supply cable to the heater.
Fuse F3 triggered.
Short circuit in the supply cable to the heater/ burner
motor/ nozzle block preheater (if installed).
Heater is functional, however the operating display
is not illuminated.
Operating display defective to cables to
the operating display interrupted or shorted.
501
5 Troubleshooting and error correction
Thermo S 160/230/300/350/400
Table 501: General error symptoms
Error symptom
Possible cause
Error in the water system
Circulating pump not operating (Aquavent 6000S and
Aquavent 6000SC only).
•
Error mode activated.
In case of malfunctions the motor is switched off via the
error mode.
Reactivation of the circulating pump motor
For this purpose disconnect the power supply for > 2 min.
After the power supply is reconnected the motor
performs a soft start.
Heater stops as the connected heat exchanger provides
insufficient heat.
Flow rate too small, because
• Air in the heater, heat exchanger or in system
sections.
• Taps/valves (flow controllers) throttled,
contaminated, closed.
• Contaminations in the system, e.g. filters or at bottlenecks.
• Circulating pump delivery rate insufficient
(air in pump housing),
• Insufficient frost protection.
• System resistance too high (especially high in the cold).
• Circulating pump defective.
Heat exchanger provides not enough heat, because
• Air in the heat exchangers and/or system sections.
• Contaminated heat exchanger surfaces (outside).
• Insufficient air entry or air exit.
• Fan: Insufficient delivery rate /
incorrect direction of rotation / resistance too high.
• Antifreeze content too high.
Approximate flow rate determination:
Heat flow [kW] according to type plate
Flow rate in [l/h] =
502
Temperature difference Δt in [K] or [°C]
measured on the heater between water inlet and water outlet
(e.g. using contact thermometer)
x 860
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
Table 501: General error symptoms
Error symptom
Possible cause
Error in the fuel supply
No fuel delivery to the heater.
•
•
•
•
•
•
•
Fuel tank empty.
Bent, closed, clogged or
leaking lines.
Paraffin deposits or frozen water entrapments in fuel
lines or lines.
Venting opening in tank closed.
Fuel lines mixed up.
Fuel filter contaminated.
Fuel screen (filter) in pump contaminated.
Error in the combustion
CO2 value cannot be adjusted to nominal value.
Irregular combustion.
•
•
•
•
•
•
•
•
•
•
5.3
Air bubbles in fuel supply line (leaking fuel supply line).
Fuel filter contaminated or leaking.
Fuel integration leaking (suction lift, low pressure in
tank), observe installation instruction.
Fuel pump defective (pump pressure).
Screen (filter) in fuel pump contaminated.
O-ring seal on fuel pump ineffective.
Atomizer nozzle defective.
Combustion air and exhaust lines throttled or closed.
Burner motor speed too low.
Coupling defective.
Malfunction code output via flash code
NOTE
If the heater is equipped with a standard timer or switch,
the error cause is outputted as a flash code via the
operating display.
3-pin plug
to SST diagnosis
2-pin plug
to flash code output
Customer-specific
plug
Another possibility to output the flash code is via the
two-pin plug on the heater wiring harness.
After five short signals the long flash signals
are counted.
The number of long flash impulses corresponds to the
respective flash code. Flash codes and their respective
error meaning are presented in Table 502.
Plug to the
control unit
Fig. 501 Standard Thermo S heater wiring harness
503
5 Troubleshooting and error correction
Thermo S 160/230/300/350/400
Table 502 Error and flash codes
Error description
Flash code
Control unit error (e.g. incorrect checksum, no EOL programming)
0
No start within safety period
1
Flame interruption in burner operation, repeated starts unsuccessful
2
Low voltage
3
Extraneous light (flame detector "Bright" prior to ignition) or (flame detector "Bright" in run-down 2)
4
Flame detector short circuit after terminal 31 or interruption or short circuit after terminal 30
5
Coolant temperature sensor short circuit after terminal 31 or interruption or short circuit
after terminal 30
6
Coolant temperature sensor / overheating protection defective
6
Overheating protection temperature sensor short circuit after terminal 31 or interruption or short circuit
after terminal 30
6
Solenoid valve short circuit after terminal 31or interruption or short circuit after terminal 30
7
Motor short circuit after terminal 31 or interruption or fuse F1 defective or short circuit after terminal 30
8
Circulating pump short circuit after terminal 31 or interruption or short circuit after terminal 30
9
Overheating protection triggered
10
Electronic ignition unit short circuit after terminal 31 or interruption or short circuit after terminal 30
11
Heater interlock - release required (caused by repeated malfunctions or repeated
flame interruptions)
12
Nozzle block preheater sensor short circuit after terminal 31 or interruption or short circuit after
terminal 30
13
Nozzle block preheater heating element short circuit after terminal 31 or interruption or short circuit
after terminal 30
13
Minimum combustion period undercut several times
14
Faulty speed signal
15
504
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
5.4
Error symptoms during functional
tests with malfunction code output or
diagnosis
5.4.1
Error symptom "No start within safety period"
If due to a malfunction the heater unsuccessfully attempted
to start eight times in a row, it will be interlocked.
No further start attempts will be tried.
The heater interlock overrides the standard
malfunction interlock.
The procedure for releasing the heater interlock can be
found in point 4.6.1.
The "No start within safety period" error symptom does
not always indicate that no ignition took place.
This symptom occurs as well, if the heater fails to enter
heating operation (heating or auxiliary heating state) after
successful ignition, e.g. in case the fuel supply is interrupted.
5.4.2 Error symptom "Flame interruption"
If due to a malfunction flame interruption occurs during
heating operation five times in a row, the heater will be
interlocked.
No further start attempts will be tried.
The heater interlock overrides the standard
malfunction interlock.
The procedure for releasing the heater interlock can be
found in point 4.6.1.
NOTE
After above mentioned error symptoms occur,
troubleshooting according to page 506 is recommended.
505
5 Troubleshooting and error correction
Thermo S 160/230/300/350/400
NO
YES
Are the combustion air intake opening and line and the
exhaust line clean and securely mounted?
Clean and securely mount the combustion air intake
opening and line and the exhaust line.
Is sufficient fresh air intake ensured and are no exhaust fumes
drawn in?
Secure fresh air supply. Prevent
exhaust intake.
Switch heater on or start burner motor component test: Does
Check the burner motor
the burner motor start?
Is the fan wheel properly secured?
Are all screw connections tightened and ensured that no air
escapes?
Properly secure the fan wheel. Make sure that all screw
connections are tightened and that no air escapes.
Are all electrical connection plugged in and undamaged?
Connect electrical connections or replace
damaged parts.
Is the flame detector inspection glass and/or the flame
detector clean and undamaged?
Clean the flame detector inspection glass and/or
the flame detector. If the flame detector is damaged,
replace the control unit.
Is the correct disc installed and properly mounted?
Install the correct disc and mount it properly.
Is the distance of the ignition electrodes OK and/or is the
ignition electrode properly fitted?
Replace and/or properly fit ignition electrodes.
Is the atomizer nozzle clean, without deposits and properly
screwed in?
Does the atomizer nozzle properly atomise?
Replace or properly mount the atomizer nozzle. Do not
clean it!
Is the fuel used suitable for the operating
temperature?
Switch heater on or start
motor component test:
Does the fuel return work?
Is the fuel in the fuel supply
line and the fuel return line
bubble-free?
Is the pump pressure
OK?
506
Is the fuel filter
contaminated,
clogged or leaking?
Replace the fuel
filter.
Use fuel suitable for the operating temperature. If needed,
clean all parts routing fuel and replace fuel filter.
Is the fuel line leaking
on the suction side or is
a line closed?
Are the fuel lines
empty?
Re-tighten screw
connections. Replace
or open all lines as
needed.
Fill lines (several start
repetitions or purging
procedure as
needed).
Does the solenoid
valve open?
Replace the complete
solenoid valve.
Replace fuel pump.
Replace control unit.
Are the O-rings installed
in the fuel pump?
Are they tightly
screwed on?
Replace O-rings and
filter (screen) as
needed.
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
5.4.3 Error symptom "Low voltage"
A value is stored in the control unit as smallest
"permissible low voltage".
It must be noted that the voltage may be lowered during
heater start, and that the "low voltage" threshold may be
violated.
Among others this depends on the vehicle electrical system,
the temperature of optional components, such as the nozzle
block preheater, circulating pumps or heatable filters.
NO
YES
Is the battery charge condition permanently
Ensure permanent battery voltage greater
greater than 20.5V ± 0.5V?
than 20.5V ± 0.5V.
Disconnect the A1 plug from the control unit.
Is the electrical connection to the heater OK?
Repair or replace the
Is the voltage between pin 2 and pin 1 of plug A1
(fuse, wiring harnesses, plug connections,
electrical connection to
at least 20.5V ± 0.5V?
pins, etc.)
the heater.
Start heater: Is the voltage permanently applied to the heater during heater
Ensure higher voltage during heater
start or during heating operation 20.5V ± 0.5V? (Verify with SST diagnosis.)
start and/or heating operation.
Control unit defective, replace it.
507
5 Troubleshooting and error correction
Thermo S 160/230/300/350/400
5.4.4 Error symptom "Extraneous light detected
prior to ignition or during run-down"
NO
YES
Did overheating occur?
Correct overheating cause.
Is the burner properly screwed onto the
Properly screw burner onto the heat
heat exchanger?
exchanger.
Did the heater burn longer before?
Is the combustion air inlet clean/free?
Clean/clear combustion air intake inlet.
Was the heater stopped or the voltage
Is the motor OK and can rotate freely?
Correct motor problem.
disconnected before or during run-down?
Is the exhaust outlet clean/free?
Clean/clear exhaust outlet.
Is the burner pipe coked, contaminated
Clean / replace burner pipe. Clean
or damaged?
heat exchanger.
Is the heat exchanger sooted?
Insert correct combustion chamber.
Is the correct combustion chamber
Let heater cool down for approx.
2 minutes and restart again.
Did the error return?
Replace the complete solenoid valve.
Did the error return?
Control unit defective, replace it.
508
installed?
Did the error return?
Thermo S 160/230/300/350/400
5.4.5
5 Troubleshooting and error correction
Error symptom "Flame detector defective"
The flame detector cannot be replaced. It can only be
tested using SST diagnosis.
In case of damage or if the target value cannot be
reached, the control unit must be replaced as needed.
5.4.6 Error symptoms "Temperature sensor /
overheating protection defective" and
"Overheating"
NO
Are the temperature sensor plugs,
contacts and cables OK?
Correct error and/or replace the
component.
YES
Are the adapter wiring harness
plugs, contacts and cables OK?
Correct error and/or replace the
component.
Is sufficient cooling and coolant flow
ensured?
Correct error
Are all shut-off devices opened?
Is the cooling system leak-tight,
completely filled and purged?
Is a circulating pump connected and
the direction of rotation of the
circulating pump correct?
Is the coolant cold-resistant?
Replace control unit.
5.4.7 Error symptom "Circulating pump
interruption"
The "Circulating pump interruption" error can also be
triggered by dry operation of the circulating pump.
509
5 Troubleshooting and error correction
5.5
Individual component tests
Thermo S 160/230/300/350/400
5.5.1 General visual inspection
Individual components can basically be tested using
visual inspection or manual electrical testing.
•
Inspect components for damages (cracks, deformation,
leaks, discolourations, etc.) and replace as needed.
In addition, the electrical components of the burner motor,
circulating pump, electronic ignition unit, solenoid valve,
nozzle block preheater operating display and flame
display can be checked using the "Component Test"
menu of the SST diagnosis.
The flame detector as well as the fuel pump pressure can
also be checked using the "Component Test" menu of the
SST diagnosis.
•
Inspect plugs and cables for corrosion, contact and
crimp errors and repair as needed.
•
Check plug contacts for corrosion and tight fit. Repair
as needed.
NOTE
Prior to disconnecting the temperature sensor plug
connection, disconnect the heater from the vehicle
electrical system.
For tests using the "Component test" menu of SST
diagnosis, the temperature sensor must be replaced
with a test plug.
5.5.2 Heat exchanger visual inspection
•
Inspect heat exchanger interior for damage,
corrosion, sooting and deposits.
•
Inspect heat exchanger for outer damage,
corrosion, moisture, deformations, deposits,
discolourations, etc.
ATTENTION
Soot and deposits in the heat exchanger must be
removed, as they impact the heat transfer to the coolant.
Severe outer deformations may impact coolant flow.
5.5.2.1 Visual inspection of exhaust outlet and
exhaust line
Inspect exhaust outlet and possibly available exhaust line
for conditions, tight fit, contamination and deposits.
If exhaust fumes exit downwards under the vehicle,
exhaust gas deflection is absolutely necessary.
5.5.3 Combustion chamber visual inspection
A test plug must be used for the component test
using SST diagnosis.
Fig. 502
ATTENTION
The general safety regulations according to chapter 1
must be observed.
•
Remove combustion chamber (see 8.11).
•
Inspect swirl plate and combustion chamber head for
damage and tight fit.
•
Check and remove combustion chamber for scalings
and coke deposits as needed.
•
Inspect combustion chamber for deformation and
moisture.
•
Inspect welding seam and combustion chamber for
cracks.
NOTE
Cracks in longitudinal direction at the end of the welding
seam shorter than 80 mm are permissible.
•
510
After the inspection is completed, reinstall the
combustion chamber (see 8.11).
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
Pin 3 & 4
Water
temperature sensor
Pin 1 & 2
Overheating protection
Fig. 503
Resistance check of the temperature sensor
with integrated overheating protection
CAUTION
Prior to removing the temperature sensor, the
overpressure in the cooling system must be released by
opening the cooling lid. Observe the risk of injuries due to
increased coolant temperature. Possibly let heater
additionally cool down and have collecting container
ready for discharged coolant.
Fig. 504
Resistance vs. temperature chart
Overheating protection (pin 1 & pin 2)
Water temperature sensor (pin 3 & pin 4)
Inspection
Inspect temperature sensor, plug and cable
for damage and proper fit.
•
Remove temperature sensor (see 8.3).
•
Perform the electrical test using a measuring device
suitable for resistance measurements.
The water temperature sensor and the overheating
protection should indicate values according to the
charts.
Preferably the resistance should be measured at an
approx. consistent temperature of 20° C and
approx. 100° C (immerse sensor up to the copper
gasket ring into boiling water).
Prior to reading the value, the sensor should be
exposed to the temperature for approx. 20 seconds.
•
Overheating protection [Ohm]
•
1500
150
140
1400
20°C: 107…109 Ohm
100°C: 137…140 Ohm
130
120
1300
20°C: 1070 …1086?
1200
100°C: 1377…1393?
1100
110
100
0
20
40
60
80
100
120
Water temperature sensor [Ohm]
5.5.4
1000
140
Temperature [°C]
Fig. 505
Install temperature sensor (see 8.3).
511
5 Troubleshooting and error correction
Thermo S 160/230/300/350/400
5.5.5 Adapter wiring harness inspection
•
Check circlip for proper fit.
Inspection
•
Install hood (see 8.4).
•
Inspect adapter wiring harness for tight fit and
damage of the rubber grommet and the plug.
•
Remove hood (see 8.4).
•
Disconnect temperature sensor.
•
Disconnect adapter wiring harness from the control
unit and pull from its position in the burner housing.
•
Inspect adapter wiring harness for plug and cable
insulation damage.
•
Check electrical cable connection on the plug pins.
•
Connect adapter wiring harness to the control unit and
return it into its position in the burner housing.
•
Connect temperature sensor.
•
Install hood (see 8.4).
Fan
Hood
Shaft
circlip
Fig. 507
5.5.7 Burner motor inspection
NOTE
It is possible to test the burner motor using the
Component Test menu of SST diagnosis.
The motor can also be checked by applying direct voltage.
The electrical connection to the control unit must be
disconnected first.
Motor cross member
Fig. 506 Adapter wiring harness
5.5.6 Fan and combustion air intake line visual
inspection
•
Inspect a possibly available combustion air intake line
for contamination, condition and deposits.
•
Remove hood (see 8.4).
•
Inspect fan channels for contamination and deposits.
•
Inspect fan and motor shaft mount for cracks, stress
marks and deformations.
•
Check cover plate for tight fit.
512
Motor
Fig. 510
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
Inspection using SST diagnosis
• Disconnect the heater from the vehicle electrical
system.
•
Disconnect the temperature sensor plug and connect
the test plug to the adapter wiring harness.
•
Check if the motor used corresponds to the heating
capacity class.
•
Inspect the motor for bearing conditions (stiffness).
For this purpose remove hood as needed (see 8.4).
•
Reconnect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
•
Select the motor in the Component Test menu.
Insert target speed and runtime. Next start the
component test.
5.5.8 Electronic ignition unit inspection
NOTE
It is possible to manually test the functionality of the
electronic ignition unit, and using the Component Test
menu of SST diagnosis.
It can only be verified by visual inspection of the ignition
electrode, whether the ignition spark jumps over to the
ignition electrode.
CAUTION
High voltage: The voltage received by the ignition
electrode is >13,000 Volt.
During operation or testing of the electronic ignition unit, the
ignition electrode may not be contacted by persons or items.
ATTENTION
Do not test or apply voltage to the electronic ignition unit
without an ignition electrode.
Inspect the electronic ignition unit for housing and end
cover damage.
No mechanical damage may be caused or be present on
housing and end cover.
Compare the displayed actual speed with the target
speed of SST diagnosis.
•
After the test is completed, exit SST diagnosis
as needed.
•
Disconnect the heater from the vehicle electrical
system.
•
Disconnect the test plug and reconnect the
temperature sensor plug.
•
Ignition electrode 13,000 Volt
10kΩ
Install hood (see 8.4).
Fig. 511
513
5 Troubleshooting and error correction
Inspection using SST diagnosis
• Remove burner (see 8.2).
•
Connect the test plug to the adapter wiring harness.
•
Reconnect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
Thermo S 160/230/300/350/400
CAUTION
High voltage: The voltage received by the ignition
electrode is >13.000 Volt.
During operation or testing the ignition electrode may not
be contacted by persons or items.
Inspection
• Remove burner (see 8.2).
•
Check distance of the electrode tip to the atomizer
nozzle (see Fig. 512).
Check the distance between the electrodes
(see Fig. 512).
•
Select the electronic ignition unit in the Component Test
menu, enter a runtime and start the component test.
•
•
Nominal condition: Ignition sparks the ignition
electrode jump over with a rate of 6Hz.
NOTE
The distance between the electrodes may b measured
using checking gauge, item number 310646.
•
After the test is completed, exit SST diagnosis as
needed.
•
Disconnect the heater from the vehicle electrical
system.
•
Disconnect the test plug.
•
Install burner (see 8.2).
•
If needed, lift off ignition electrode (3, Fig. 805) from
the electronic ignition unit by twisting a screwdriver
sideways (see Fig. 804).
•
Inspect the ignition electrode insulation for damage.
•
Functionality is verified while inspecting the electronic
ignition unit.
Manual functional test when disassembled
• Remove electronic ignition unit (see 8.6).
•
Connect ignition electrode.
•
Apply 24V direct voltage according to Fig. 511
(10kOhm on SE input).
•
Nominal condition: Ignition sparks the ignition
electrode jump over with a rate of 6Hz.
•
After the test is completed, install the electronic
ignition unit (see 8.6) and attach the ignition electrode.
•
Install burner (see 8.2).
5.5.9 Ignition electrode inspection
NOTE
The ignition electrode insulation may not be damaged.
Ignition electrodes not functioning properly must be
replaced.
ATTENTION
Do not damage the electronic ignition unit when removing
the ignition electrode.
514
8 ± 0,5
4+ 1
Fig. 512
5 ± 0,5
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
5.5.10 Flame detector inspection
NOTE
In case of contamination the glass body of the flame
detector and the inspection glass in the disc (see Fig. 513)
must be cleaned.
The flame detector is permanently integrated into the
control unit and cannot be replaced.
Functionality is verified using SST diagnosis.
In case of damage or if the target value cannot be
reached, the control unit must be replaced as needed.
Electronic ignition unit
Disc
Inspection
• Remove burner (see 8.2).
•
Connect the test plug to the adapter wiring harness.
•
Connect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis and establish the connection to
the heater.
•
Cover the glass body of the flame detector.
•
Check the flame detector voltage displayed on a PC
by SST diagnosis
(target value: U = 4.60V...4.74V).
Remove the cover from the glass body of the flame
detector and illuminate from close distance using a
bright lamp.
•
•
Check the flame detector voltage displayed on a PC
by SST diagnosis
(target value: U = 0.60V...1.50V).
•
After the test is completed, exit SST diagnosis as
needed.
•
Disconnect the heater from the vehicle electrical
system.
•
Disconnect the test plug as needed.
•
Install burner (see 8.2).
Flame detector
Window
Fig. 513
515
5 Troubleshooting and error correction
5.5.11 Fuel pump inspection
ATTENTION
The pump pressure of the fuel pump is adjusted to a
fixed value in the factory.
It is not permitted to change the pump pressure.
If the specified pressure cannot be reached, the fuel
pump must be replaced.
Inspection using SST diagnosis
• Remove burner (see 8.2).
•
Connect the test plug to the adapter wiring harness.
•
Connect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
•
Select and start the pump pressure test in the
Component Test menu.
•
Check the information and follow the instructions
provided by SST diagnosis.
•
The motor is started using the speed programmed in
the control unit.
•
Compare the actual pressure with the target pressure
in Table 503.
According to the manufacturer's specifications the fuel
pump and fuel hoses must be replaced after 5 years.
NOTE
If bio diesel or FAME is used, the fuel pump and fuel
lines must be replaced according to the latest
technical information / notification.
CAUTION
The ignition electrode must be removed during the
pump pressure check.
NOTE
The fuel pump pressure can be checked while the burner
is disassembled, using the Component Test menu of SST
diagnosis.
A pressure test unit with a display range from 0 to 15 bar
is required (Fig. 514).
The pressure test unit can be obtained from a Spheros
Service Center or a distribution partner.
Thermo S 160/230/300/350/400
If the specified pressure cannot be reached, the fuel
pump must be replaced.
•
Follow the instructions provided by SST diagnosis.
•
After the test is completed, exit SST diagnosis as
needed.
The following inspections should be performed prior
to testing the pump pressure:
•
Disconnect the heater from the vehicle electrical
system.
•
Is the CO2 content properly adjusted?
•
Disconnect the test plug.
•
Do the fuel pump and atomizer nozzle used
correspond to the heating capacity class?
•
Install burner (see 8.2).
•
Is the fuel temperature 15...25°C?
Table 503 Fuel pump pressures
•
Are available check valves in the fuel (pre-)flow and
return line opened?
•
Was the fuel filter in the fuel (pre-)flow line replaced?
•
Are the filters (screens) in the pump inlet clean?
• Is the fuel delivered without bubbles?
Attach a transparent hose for testing.
516
CO2
without fuel
delivery by
nozzle
with
fuel
delivery by
nozzle
[Vol.-%]
[bar]
[bar]
S160
9.5 + 1.5
10.1 ± 0.3
10.0 ± 0.4
S230
9.5 + 1.5
10.2 ± 0.3
9.8 ± 0.4
S300
9.5 + 1.5
10.6 ± 0.3
10 ± 0.4
S350
9.5 + 1.5
10.9 ± 0.3
10.4 ± 0.4
S400
9.5 + 1.5
9.5 ± 0.3
9.1 ± 0.4
Heater
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
•
Select and start the solenoid valve in the Component
Test menu.
•
The solenoid valve must audibly open.
•
After the test is completed, exit SST diagnosis as needed.
•
Disconnect the heater from the vehicle electrical system.
•
Disconnect the test plug.
•
Install burner (see 8.2).
Manual inspection:
• Remove burner (see 8.2).
Fig. 514
•
Disconnect the solenoid valve plug from the control unit.
•
Check the electrical functionality by applying direct
voltage:
5.5.12 Solenoid valve inspection
CAUTION
The coil of the solenoid valve can heat up in switched-on
condition.
The solenoid valve must only be completely replaced.
In case of replacement or assembly a new gasket ring
must be used.
NOTE
Due to system characteristics draining the space between
solenoid valve and nozzle bore may cause fuel dripping
from the atomizer nozzle for a short period of time.
A leaking valve seat of the solenoid valve can be indicated
by smoke development in the heater during the run-down.
Fuel drips from the atomizer nozzle.
A not closing solenoid valve may cause heater deactivation
during run-down with heater interlock activation.
– Opening voltage:
– Power consumption at
24V and 20°C:
– Nominal current at 24V:
starting at 17.0 Volt
9 Watt
0.37 Ampere
The solenoid valve must audibly open, when voltage
is applied.
•
Connect the solenoid valve plug to the control unit.
•
Install burner (see 8.2).
It is possible to manually test the electrical functionality of
the solenoid valve, and using the Component Test menu
of SST diagnosis.
Inspection using SST diagnosis
• Remove burner (see 8.2).
•
Connect the test plug to the adapter wiring harness.
•
•
Connect the heater to the vehicle electrical system.
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
Fig. 515 Solenoid valve
517
5 Troubleshooting and error correction
5.5.13 Nozzle block preheater inspection
CAUTION
The heating element of the nozzle block preheater can
heat up during inspection.
Do not pull heating element out of the nozzle holder during
inspection.
NOTE
At a temperature of < 5°C the heating element in the
nozzle holder is switched on via a temperature sensor.
The heating duration depends on the temperature and the
vehicle electrical system voltage.
The power consumption at 24 Volt amounts to approx.
130 Watt.
Thermo S 160/230/300/350/400
Manual inspection
• Remove burner (see 8.2).
•
•
Disconnect the nozzle block preheater plug from the
control unit.
If necessary, remove the nozzle block preheater.
•
Check the electrical resistance:
Heating element between pin 1 and 2:
max. 3.9...4.9Ω at 20°C.
•
If necessary, install the nozzle block preheater.
Inspection using SST diagnosis
• Remove burner (see 8.2).
•
Connect the nozzle block preheater plug to the control
unit.
•
Connect the test plug to the adapter wiring harness.
•
Install burner (see 8.2).
•
Connect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
•
Select the optional nozzle block preheater in the
Component Test menu, select a runtime and start the
component test.
Nominal condition: The heating element warms up.
•
After the test is completed, exit SST diagnosis
as needed.
•
Disconnect the heater from the vehicle electrical
system.
•
Disconnect the test plug.
•
Install burner (see 8.2).
518
Heating element
Pin 1
Pin 2
Fig. 516
Thermo S 160/230/300/350/400
5 Troubleshooting and error correction
5.5.14 Circulating pump inspection
ATTENTION
The safety device of the circulating pump may never be
pulled, while the pump is running.
Inspection using SST diagnosis
• Disconnect the heater from the vehicle electrical
system.
•
Disconnect the temperature sensor plug and connect
the test plug to the adapter wiring harness.
•
Check the electrical connections as well as the
cooling system for leak-tightness.
•
Connect the heater to the vehicle electrical system.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Component Test menu.
•
Select and start the circulating pump in the
Component Test menu and start the component test.
•
After the test is completed, exit SST diagnosis
as needed.
•
Disconnect the heater from the vehicle electrical
system.
•
Disconnect the test plug and reconnect the
temperature sensor plug.
•
Connect the heater to the vehicle electrical system.
519
5 Troubleshooting and error correction
520
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
6
Schematic diagrams
6.1
General
6 Schematic diagrams
The following figures represent customer-dependent
heater connection options to the vehicle electrical system.
The heater wiring harness cables as well as the cables of
the vehicle electrical system are shown.
ATTENTION
In case of vehicle cable lengths up to 7.5 m the cable
cross-sections must be at least of the same size as the
respectively corresponding cable of the heater wiring
harness.
In case of vehicle cable lengths between 7.5 m and 15 m
the cable cross-sections in the vehicle must be larger
dimensioned than the respectively corresponding cable of
the heater wiring harness. The cable cross-sections
indicated in the table must be applied.
601
6 Schematic diagrams
Thermo S 160/230/300/350/400
30
31
61
F1
(HG)
F2
(UP)
F3
A1
Heater wiring
harness
1
2
X1
UP M
UP 1
2
UP +
1
2,5mm
2
2,5mm
2
3
br
2
5
bl
4
1
4
3
2
6
X2
2
Terminal 30 (1)
4
Terminal 30(2)
3
BA +
6
13
0,75mm 2
rd/wt
bl
or
8
2
bl
9
UPFA
5
0,75mm 2
S1
HS
1
0,75mm
X3
S2 (3-step switch)
0,75mm
2
rd/wt
7
K-line or CAN-H
2
0,75mm
2
rd
2
L-line or CAN-L
6
0,75mm2
bl
3
1
0,75mm2
br
4
2
or
10
0,75mm
2
rd
1
0,75mm
2
bl
2
0,75mm
2
br
14
0,75mm2
ye
1
2
rd
11
2
br
12
Operating mode
FA
4
FA +
BA +
BA (Test)
3
D2
BA -
D1
W-BUS S
Diagnosis +
Diagnosis -
0,75mm
0,75mm
0,75mm
M
Vcc
2
DVW
M
MV
1
2
Z
1
4
6
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
X3
X2
1
3
7
-
1
+
1
2
3
R
4
3
2
1
4
T
3
6
Vcc
D2
A1
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
2
6
5
2
1
2
1
Item
BA (Test)
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Fig. 601 Standard system connection to wiring harness 2710250_
602
Heater
A2
1
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
ZFG
Vcc
D1
8
SE
3
Control unit
X1
BM
V
5
5
Diagnosis -
Saving mode 2
A2
rd
S3
Terminal 61 (D+)
Saving mode 1
normal
br
2
2.5mm
2,5mm 2
2,5mm 2
Controller
BA
Terminal 31
B
1
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Thermo S 160/230/300/350/400
6 Schematic diagrams
75(15)
58
30
31
61
F3
F1
(HG)
F2
(UP)
A1
Heater wiring
harness
1
2
UP 1
M
1
UP -
X1
UP +
2
1
2,5mm
2,5mm
2
3
br
2
2
5
bl
4
1
4
3
2
6
X2
11
Terminal 31
2
S3
8
12
7
2
Terminal 30 (1)
Terminal 30(2)
3
UPFA
5
0,75mm
2
or
8
HS
1
0,75mm
2
bl
9
X3
Operating mode
FA +
BA +
BA (Test)
W-BUS S
Digital timer P
with Plus on terminal 10 =
Continuous operation for immediate heating
Terminal 10 open =
Heating period can be variably programmed
(10 min to 120 min)
1
4
6
Legend
0,75mm
2
rd/wt
7
2
0,75mm
2
rd
2
6
0,75mm2
bl
3
1
0,75mm2
br
4
4
0,75mm
2
or
10
3
0,75mm
2
rd
6
1
0,75mm
2
bl
2
0,75mm 2
br
14
0,75mm2
ye
1
2
rt
11
2
br
12
Diagnosis+
0,75mm
Diagnosis -
0,75mm
X3
1
3
Vcc
2
7
1
D1
8
2
3
BM
DVW
M
MV
1
2
Z
-
1
+
ZFG
R
4
3
2
1
Vcc
4
T
3
Vcc
D2
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
A1
2
6
5
2
1
2
1
Item
BA (Test)
Heater
A2
1
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
SE
3
Control unit
X2
X1
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
BA -
M
V
5
5
D2
D1
1
13
0,75mm
Diagnosis-
FA
rd/wt
bl
6
K-line or CAN-H
Saving mode 2
A2
rd
BA +
Terminal 61 (D+)
Saving mode S2 (3-step switch)
1 normal
2.5mm
2,5mm 2
2,5mm 2
2
4
X4
4
br
2
Controller
10
1
B
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Fig. 602 Standard system connection with digital timer to wiring harness 2710250_
603
6 Schematic diagrams
Thermo S 160/230/300/350/400
30
31
61
F2
(UP)
F3
A1
X2
2
2,5mm br
Terminal 30(1)
4
2,5mm rd
Terminal 30(2)
S1
HS
1
L-line
K-line
UP -
7
UP 1
UPL
BA
5
2,5mm br
BA +
4
2,5mm br
1
2,5mm bl
A2
2
Vcc
5
2
9
2
8
6
0,75mm bl
5
0,75mm or
2
13
2
7
0,75mm bl
7
0,75mm rd/wt
2
0,75mm rd
2
2
FA +
0,75mm rd
2
0,75mm br
14
0,75mm2 ye
1
2
D1
2
11
2
12
Diagnosis+
0,75mm rd
Diagnosis -
0,75mm br
X3
X2
2
1
2
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
1
3
4
5
7
6
6
5
7
1
Vcc
D2
coolant
C1
C2
150°C
125°C
-50°C
A1
1
3
2
1
overheating
3
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
1
2
2
1
Item
BA (Test)
Heater
A2
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Fig. 603 EvoBus system connection to wiring harness 11111288_, watertight
604
T
4
3
Control unit
2
ZFG
2
D1
4
+
R
Heater wiring
harness
X1
-
1
Vcc
6
0,75mm bl
SE
3
3
2
1
MV
Z
4
10
2
D2
BA W-BUS S
3
1
BA +
BA (Test)
0,75mm2 or
M
2
2
4
FA
DVW
1
3
Operating mode
BM
V
1
4
3
2
6
S2 (3-step switch)
Saving mode 2
M
1
2
2
4
K-line
B
2
5
2
X3
Terminal 61 (D+)
Saving mode 1
normal
2
6
UPFA
S3
3
2,5mm rt/wt
X1
UP monitoring
2
2
0,75mm bl
2
0,75mm bl
2
0,75mm rd
UP +
1
2
3
UP M
2
Terminal 31
Controller
F1
(HG)
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Thermo S 160/230/300/350/400
6 Schematic diagrams
30
31
61
F1
(HG)
F2
(UP)
F3
X1 10-pin
S1
2
2,5mm br
Terminal 30(1)
4
2,5mm rt
Terminal 30(2)
HS
3
2,5mm rt/ws
3
0,75mm sw
5
UP1
M
A1
2
Terminal 31
S3
BA
1
1
2
2
2
2
2
UP+
7
UPFA
5
0,75mm or
BA +
6
0,75mm bl
2,5mm sw
2
4
2
1
4
3
2
6
2
Vcc
A2
9
Terminal 61 (D+)
5
0,75mm rd/wt
13
2
7
2
2
0,75mm rd
6
0,75mm bl
Controller
2,5mm br
K-line
L-line
Saving mode 1
normal
2
1
2
2
Operating mode
Saving mode 2
FA
FA +
3
D2
0,75mm or
0,75mm rd
2
0,75mm br
D11
0,75mm ye
Diagnosis+
2
0,75mm rd
Diagnosis -
3
0,75mm br
BA W-BUS S
10
2
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
9
1
8
4
2
1
T
Vcc
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
12
Control unit
D1
3
ZFG
11
2
7
+
1
2
X2
-
1
3
Heater wiring
harness
X1
SE
3
1
14
2
MV
Z
Vcc
6
2
M
2
2
0,75mm bl
DVW
R
10 10
2
1
BA +
BA (Test)
4
V
3
4
2
BM
4
3
S2 (3-step switch)
2
2
8
Terminal 31
M
1
5
X2 8-pin
B
1
A1
D2
2
1
1
2
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
Item
BA (Test)
Heater
A2
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Fig. 604 Standard system connection to wiring harness 11111289_
605
6 Schematic diagrams
Thermo S 160/230/300/350/400
30
31
61
F2
(UP)
F3
Marking point green
F4
(UP2)
X1
UP -
UP 1
M
UP +
2
2
2,5mm br
1
2,5mm bl
2
A1
Marking point yellow
X3
UP -
UP 2
M
BA
Terminal 31
4
Terminal 30(1)
Terminal 30(2)
1
S3
BA +
UPFA
S1
HS
1
2
0,75mm bl
8
2
2.5mm br
2
2,5mm rd
2
2,5mm rd/wt
2
2
10
0,75mm bl
7
0,75mm or
6
0,75mm bl
1
4
3
2
6
2,5mm bl
2
2,5mm br
18
A2
Vcc
2
8
13
Terminal 61 (D+)
2
0,75mm rd/wt
3
2
0,75mm rd
K-line (MAN-Cats)
7
2
21
Saving mode 1
normal
Operating mode
FA
BA +
BA (Test)
11
0,75mm or
9
0,75mm rd
D2
BA -
1
2
0,75mm br
D1
1
0,75mm ye
Diagnosis+
2
0,75mm rt
Diagnosis -
3
0,75mm br
W-BUS S
4
Vcc
1
3
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
Control unit
A1
D2
Heater
A2
8
2
T
3
Heater wiring
harness
15
16
17
18
19
20
21
ZFG
12
D1
1
2
3
4
5
6
7
+
11
2
X1/X3
-
1
1
2
X2
SE
1
14
2
Z
3
Vcc
6
2
MV
R
2
0,75mm bl
M
3
10
2
FA +
DVW
2
4
2
BM
4
3
S2 (3-step switch)
Saving mode 2
2
9
2
M
V
1
5
2
B
1
4
2
Water pump 2+ 17
UPL
2
5
2,5mm bl
1
Water pump 2UP monitoring
3
2
X2
S4
2
2,5mm br
2
UP +
1
2
Controller
F1
(HG)
1
2
6
5
2
1
2
1
14
13
2
1
14
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
Item
BA (Test)
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Fig. 605 MAN system connection to wiring harness 11111290_
606
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Thermo S 160/230/300/350/400
6 Schematic diagrams
30
31
61
F1
(HG)
F2
(UP)
F3
A1
Heater wiring
harness
2
X1 2-pin
UP -
UP 1
M
3
2
2,5mm br
1
UP +
1
2,5mm bl
2
2
5
2
4
1
4
3
2
6
X2 6-pin
2
Terminal 30(2)
3
2
2.5mm br
2
2,5mm rd
2
2,5mm rd/wt
4
A2
2
BA +
UPFA
6
0,75mm bl
S3
5
0,75mm or
S1
HS
1
0,75mm bl
Vcc
5
2
9
2
7
K-line or CAN-H
2
0,75mm rd
1
2
2
BA +
1
0,75mm bl
BA -
2
0,75mm br
D1 1
0,75mm ye
Diagnosis+
2
0,75mm rd
Diagnosis -
3
0,75mm br
D2
BA (Test)
W-BUS S
-
1
+
4
T
3
Vcc
coolant
14
C1
C2
150°C
125°C
-50°C
2
1
overheating
1
2
11
2
12
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
3
2
1
1
2
1
6
5
4
3
2
1
2
2
A1
D2
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
1
2
2
1
Item
BA (Test)
Heater
A2
grey
black
1
D1
X3
X2
ZFG
1
Control unit
X1
SE
3
2
2
2
MV
Z
Vcc
6
2
M
R
10
2
0,75mm rd
DVW
3
4
FA +
BM
4
3
FA
2
2
8
13
X3 2-pin
M
V
1
Controller
BA
Terminal 31
Terminal 30(1)
B
1
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Fig. 606 IRISBUS system connection to wiring harness 11111292_
607
6 Schematic diagrams
Thermo S 160/230/300/350/400
30
31
61
F1
(HG)
F2
(UP)
F3
A1
X2
S1
2
Terminal 31
2
2,5mm br
Terminal 30(1)
4
2,5mm rd
Terminal 30(2)
3
2,5mm rd/wt
HS
1
0,75mm bl
1
2
2
2
3
2
2
5
4
UP -
UP 1
M
UPL
UP +
UP monitoring
S3
1
4
3
2
6
2,5mm br
1
2,5mm bl
A2
2
Vcc
5
2
6
0,75mm bl
5
0,75mm or
9
2
2
BA +
4
0,75mm bl
Terminal 61 (D+)
7
0,75mm rd/wt
13
2
7
FA
FA +
0,75mm rd
1
0,75mm bl
2
0,75mm br
D11
0,75mm ye
Diagnosis+
2
0,75mm rd
Diagnosis-
3
0,75mm br
BA W-BUS S
4
2
1
3
2
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
1
4
5
7
6
6
5
7
2
Vcc
150°C
125°C
-50°C
2
1
overheating
Control unit
A1
D2
1
2
3
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
1
2
2
1
Item
BA (Test)
Heater
A2
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Fig. 607 Volvo system connection to wiring harness 11111293_
608
C2
12
D1
3
coolant
C1
11
2
4
T
1
X3
X2
ZFG
3
Heater wiring
harness
X1
+
1
14
2
-
Vcc
6
2
SE
1
R
2
1
Z
3
3
10
2
D2
BA +
BA (Test)
0,75mm or
3
MV
2
4
Operating mode
M
4
3
2
2
2
8
S2 (3-step switch)
Saving mode 2
BM
DVW
1
2
Saving mode 1
normal
M
V
2
2
X3
UPFA
BA
2,5mm br
5
X1
Controller
UP -
2
B
1
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Thermo S 160/230/300/350/400
6 Schematic diagrams
30
31
61
F1
(HG)
F2
(UP)
F3
Heater wiring
harness
UP 1
M
3
2
2,5mm br
2
UP +
1
2
X1 2-pin
UP -
A1
2
2,5mm sw
1
2
5
4
1
4
3
2
6
X2 12-pin
2.5mm br
2
2,5mm rd
2
2,5mm rd/wt
2
5
0,75mm bl
S3
BA +
UPFA
8
0,75mm or
S1
HS
1
0,75mm sw
A2
Vcc
5
2
9
2
13
0,75mm rd/wt
2
0,75mm rd
2
7
2
Saving mode 2
Operating mode
4
0,75mm or
FA +
6
0,75mm rd
FA
D2
0,75mm bl
2
0,75mm br
D1
W-BUS S
1
0,75mm ye
Diagnosis +
2
0,75mm rd
Diagnosis -
3
0,75mm br
BA (Test)
BA -
X2
1
+
4
T
3
Vcc
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
1
2
11
2
12
Control unit
X1
9
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
8
14
13
2
1
12
10
1
Heater
A2
7
2
2
A1
D2
D1
1
ZFG
1
14
2
-
Vcc
6
2
SE
R
2
1
BA +
Z
3
3
10
2
MV
2
4
2
M
4
3
S2 (3-step switch)
2
2
8
2
Terminal 61 (D+) 7
Saving mode 1
normal
BM
DVW
1
Controller
Terminal 30(2) 11
K-line or CAN-H
M
V
2
Terminal 31 10
Terminal 30(1) 9
BA
B
1
6
3
3
4
11 5
1
2
2
1
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
Item
BA (Test)
6
5
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Fig. 608 Solaris system connection to wiring harness 11112416_
609
6 Schematic diagrams
Thermo S 160/230/300/350/400
30
31
61
F1
(HG)
F2
(UP)
F3
A1
Heater wiring
harness
1
2
X1
UP -
UP 1
M
2
UP +
1
3
2
2,5mm br
2
5
2
2,5mm bl
4
1
4
3
2
6
X2
2
4
S3
BA +
UPFA
6
2.5mm br
2
2,5mm rd
2
2,5mm rd/wt
2
0,75mm bl
5
0,75mm or
S1
HS
1
0,75mm bl
3
X3
Saving mode 1
normal
S2 (3-step switch)
2
13
2
0,75mm rd/wt
K-line or CAN-H
0,75mm rt
2
L-line o. CAN-L
6
0,75mm2sw
3
1
0,75mm2br
4
4
0,75mm or
3
0,75mm rt
FA
FA +
BA +
BA (Test)
BA W-BUS S
Diagnosis+
Diagnosis-
D2
2
2
0,75mm br
1
2
0,75mm rd
3
0,75mm br
MV
Z
-
1
+
X2
1
4
T
3
Vcc
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
1
2
11
2
12
X3
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
S4
UP
UPFA
UPL
Legend
D1
4
1
7
8
6
3
1
2
1
3
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Switch UP 2 On/Off
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
A1
D2
1
2
2
1
Item
BA (Test)
Heater
A2
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Fig. 609 IRIZA system connection to wiring harness 11112415_
610
ZFG
2
Control unit
X1
SE
3
R
14
2
0,75mm ye
M
Vcc
6
2
DVW
3
2
0,75mm bl
BM
4
10
2
1
D1
7
2
2
2
8
2
M
V
1
9
5
Operating mode
Vcc
5
2
Terminal 61 (D+)
Diagnosis-
Saving mode 2
A2
Controller
BA
Terminal 31
Terminal 30(1)
Terminal 30(2)
2
B
1
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Thermo S 160/230/300/350/400
6 Schematic diagrams
30
31
61
F1
(HG)
F2
(UP)
F3
X1 2-pin
M
UP 1
2
UP - B
2,5mm br
UP + A
2,5mm bl
2
A1
1
Temperature switch
2
2
2
3
0,75mm br
0,75mm rd
X2 16-pin
2
Temperature monitor 16
0,75mm rd
10
2,5mm bl
2
5
4
2
2,5mm bl
1
4
3
2
6
2
2
7
Terminal 30(1)15
BA
Terminal 30(2) 1
BA + 4
UPFA 3
S3
S1
HS
2
A2
2
0,75mm bl
Vcc
5
2
0,75mm or
9
2
0,75mm bl
7
Saving mode 1
normal
2
6
0,75mm rd
Diagnosis ground
5
0,75mm br
2
Saving mode 2
2
Operating mode
9
0,75mm or
FA +
8
0,75mm rd
FA
BA +
BA (Test)
BA -
D2
0,75mm bl
2
0,75mm br
D1
1
Diagnosis+ 2
0,75mm rd
Diagnosis- 3
0,75mm br
W-BUS S
B
+
4
6
11
2
12
coolant
C1
C2
150°C
125°C
-50°C
2
1
overheating
Control unit
D1
1
7
10
16
Item
BA
BM
DVW
F1
F2
F3
FA
HS
MV
S1
S2
S3
UP
UPFA
UPL
Legend
2
13
15
4
11
14
3
T
Vcc
D2
A1
Heater
A2
A
3
ZFG
1
2
X2
-
3
Heater wiring
harness
X1
SE
1
1
14
2
0,75mm ye
Z
3
2
6
2
MV
Vcc
2
1
M
R
10
2
DVW
3
4
2
BM
4
3
S2 (3-step switch)
2
2
8
13
K-line
M
V
1
Controller
Terminal 31
0,75mm br
2
2.5mm br
2
2,5mm rd
2
2,5mm rd/wt
B
1
1
2
2
1
Description
Operating display max. 5W
Combustion air motor
Nozzle block preheater
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 25 A according to DIN 72581 part 3
Vehicle blade-type fuse 5A according to DIN 72581 part 3
Flame display max. 5W
Main switch
Solenoid valve
Main switch - heater On/Off
Switch - operating mode - saving mode
Switch - UP On/Off (without heating function)
Circulating pump
External circulating pump actuation
Optional circulating pump display for testing, max. 5W
Item
BA (Test)
6
5
2
1
14
13
2
1
Description
Optionally connectible lamp for diagnosis
purposes, max. 5W
Electronic ignition unit
ZFG
Legend (cont.)
Cable crosssection in heater
wiring harness
Cable cross section for cable
lengths in vehicle
< 7.5 m
7.5 - 15m
0.75 mm2
0.75 mm2
1.5 mm2
1.0 mm2
1.0 mm2
1.5 mm2
1.5 mm2
1.5 mm2
2.5 mm2
2.5 mm2
2.5 mm2
4.0 mm2
4.0 mm2
4.0 mm2
6.0 mm2
Note:
For cable lengths below 7.5 m in the vehicle, at least the
same cable cross-sections as in the heater wiring harness
must be used. For cables lengths between 7.5 m and 15 m
in the vehicle, the cable cross sections must be enlarged
according to the table.
Line colours
bl
br
ye
ge
gr
or
rd
bl
vi
wt
rd/wt
blue
brown
yellow
green
grey
orange
red
black
violet
white
red/white
Fig. 610 Van Hool system connection to wiring harness 11112417_
611
6 Schematic diagrams
612
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
7
Servicing
7.1
General
The general safety regulations (see 1.5.2) must be
observed.
7.1.1 Heater servicing
7 Servicing
Recommended maintenance:
• In order to prevent malfunctions, the fuel filter and/or
strainer as well as the fuel pump filter (screen) must
be replaced at least once a year, in case of heavily
contaminated fuel even more often.
•
Yearly visual inspection of the fuel pump, fuel and
coolant lines for leakage.
•
Mandatory is:
Yearly atomizer nozzle replacement.
The atomizer nozzle is a consumable (not covered by
warranty).
•
Yearly visual inspection of inspection glass and flame
detector glass body, clean as needed.
•
Yearly visual inspection of the combustion chamber
and heat exchanger interior for contamination and
soot, clean as needed.
•
Inspection of combustion air intake openings and
exhaust port for contamination. Clean as needed.
•
Outside the heating period, the heater should be
operated every 4 weeks for 10 min with the heater set
to "warm" and cold vehicle engine.
•
The heater should be inspected in periodic time
intervals, latest at the beginning of the heating period
by a Spheros Service Center.
Only briefed and/or personnel trained by Spheros
may perform work on the heater.
For risk of overheating, the battery main current may not be
disconnected, while the heater is operating or in run-down.
Make sure that the circulating pump is running while the
heater is switched on for tests/inspections.
7.2
Servicing
In order to ensure long-term functional reliability, the
following maintenance activities should be performed on
the heater.
Mandatory maintenance:
• Fuel pump and fuel lines must be immediately
replaced when leaking, otherwise every 5 years.
NOTE
If bio diesel or FAME is used, the fuel pump and fuel lines
must be replaced according to the latest technical
information.
You can find the latest overview on the Spheros
homepage under Service / Technical Documents.
701
7 Servicing
7.2.1 CO2 content adjustment
A modification of the factory-adjusted burner motor speed
and thus of the exhaust CO2 content is permitted.
The burner motor speed can be adjusted using SST
diagnosis.
An exhaust measurement device (CO2 measurement
device) is necessary for the adjustment.
The exhaust CO2 content must be measured and the
combustion air volume may have to be adjusted:
• after burner repairs.
•
in case of combustion irregularities.
•
in case of heavy sooting of the heat exchanger or
other components during a functional test.
•
after atomizer nozzle replacement.
•
if heater is mainly operated above 1500 m.
•
in case of modifications to the optional, applicationdependent combustion air intake and exhaust line.
The SST diagnosis sequence defines the CO2 content
adjustment procedure.
Thermo S 160/230/300/350/400
•
Obtain the next steps from SST diagnosis. Adjust the
burner motor speed using SST diagnosis to achieve
the target value for the CO2 content.
A speed increase results in a reduction of the CO2
content and vice versa.
NOTE
An upper and lower speed limiting value is stored per
heating capacity class in the control unit.
This should prevent incorrect adjustments during
maintenance/service.
SST diagnosis displays the speed limiting values.
Table 701 CO2 heater target values
Heater
CO2 target
value
S160
S230
S300
S350
S400
9.5 + 1.5 Vol.-%
The CO2 content depends on the fuel
(viscosity) and the height above sea level (increase by
approx. 0.1 Vol-% per 100 m height increase).
In the case that the CO2 content cannot be properly
adjusted, proceed as follows:
The motor speed must be adjusted to ensure the CO2
content in the exhaust is set to 9.5 + 1.5 Vol-%.
•
Verify that fuel pump and atomizer nozzle comply with
the heating capacity class.
Adjustment procedure
• Switch heater on.
•
Verify burner motor speed.
•
Inspect burner head on the air side for damage and
replace as needed.
•
Inspect fuel filter and fuel pump filter (screen) for
contamination and replace as needed.
•
Replace atomizer nozzle.
•
Check fuel pump pressure and replace fuel pump
as needed.
NOTE
The exhaust should not be measured directly at the exhaust
outlet of the heat exchanger, as this may cause inaccuracies.
Exhaust fumes should be sampled from the exhaust pipe
in a distance of 350 mm after the heat exchanger. The
exhaust fume temperature should be measured at the
same location.
Increased exhaust temperature may indicate a sooted
heat exchanger (see 5.5.2).
•
After a combustion period of approx. 3 min. measure
the CO2 content in the exhaust and compare it to the
target value in Table 701.
•
Determine smoke number as needed: Target value
according to Bacharach: ≤ 4.
•
Connect the SST diagnosis adapter to the heater and
a PC via the interface in the heater wiring harness.
Start SST diagnosis, establish connection to the
heater and open the Calibration menu.
702
Thermo S 160/230/300/350/400
8
Burner, components and heater
removal and installation
8.1
General
8 Repair
The general safety regulations (see 1.5.2) must be
observed.
CAUTION
Prior to disassembling components the heater must be
disconnected from the vehicle electrical system.
ATTENTION
Sealing elements between disassembled components
must be principally scrapped and replaced.
This does not apply to the temperature sensor gasket ring,
as it is permanently attached.
Screws with coated threads must be scrapped and
replaced.
It is permitted to remove components from the heater,
while the heater is installed in the vehicle, assuming that
sufficient space is available and no components will be
damaged.
NOTE
If components are disassembled to a degree not covered
in this workshop manual, any warranty claim shall be
voided.
Only genuine Spheros spare parts should be used.
Removing the burner provides access to the following
components:
•
•
•
•
•
•
•
•
Atomizer nozzle
Fuel pump and solenoid valve
Electronic ignition unit and ignition electrodes
Disc with inspection glass for flame detector
Nozzle block preheater (option)
Flame detector (integrated into control unit)
Combustion chamber
Coupling with magnets
801
8 Repair
8.2
Thermo S 160/230/300/350/400
Burner removal and installation
Burner removal
1. Disconnect the heater from the vehicle electrical
system and from the circulating pump as needed.
2. Disconnect the temperature sensor plug (5, Fig. 801).
3. If necessary, disconnect the combustion air intake line
from the heater.
NOTE
Make sure that any fuel leaking during the following work
step is immediately bound and professionally disposed of.
Burner installation
1. Bring burner (1, Fig. 801) in assembly position and
ensure centre alignment and correct fit.
2. Place nuts (2) and alternately tighten them slightly.
3. Tighten nuts (2) with 7.5 Nm + 1 Nm.
4. If applicable, bolt fuel lines down with 16 ± 1 Nm using
a banjo bolt and new gaskets, or slide on fuel lines and
secure with hose clamps.
5. If applicable, secure the combustion air intake line to
the heater.
6. Connect the temperature sensor plug (5).
7. Connect heater with the vehicle electrical system and
the circulating pump as needed.
4. Unscrew fuel lines and seal with blank plugs.
5. Unscrew nuts (2).
6. Remove burner (1).
NOTE
Do not bent any lines when placing the burner down.
5
1
2
3
4
5
Burner
Nuts (2)
Screws (2)
Hood
Temperature
sensor plug
1
2
4
3
Fig. 801 Burner head / hood removal and installation
802
Thermo S 160/230/300/350/400
8.3
Removal and installation of
the temperature sensor with
integrated overheating protection
CAUTION
Risk of injuries if coolant temperature is
increased.
8 Repair
8.4
Hood removal and installation
Removing the hood provides access to the following
components for maintenance, inspection and repair
purposes:
Removal
1. Disconnect the heater from the vehicle electrical
system and from the circulating pump as needed.
3. Disconnect the temperature sensor plug (5, Fig. 801).
4. Unscrew and remove temperature sensor (1, Fig. 802).
•
•
•
•
•
•
•
Installation
1. Manually screw temperature sensor (1, Fig. 802) into
coolant outlet (2) .
2. Tighten temperature sensor (1) with 17 Nm ± 1 Nm.
3. Connect temperature sensor plug (5, Fig. 801).
4. Connect heater with the vehicle electrical system and
the circulating pump as needed.
Removal
1. Disconnect the heater from the vehicle electrical
system.
2. If applicable, disconnect the temperature sensor
(5, Fig. 801).
3. Loosen screws (3, Fig. 801).
4. Remove hood (4).
2
Fan
Burner motor
Motor cross member
Control unit
Coupling with magnets
Main wiring harness plug
Adapter wiring harness plug
Installation
1. Place hood (4, Fig. 801) in assembly position. Ensure
centre alignment, proper fit and seal towards heater
wiring harness and adapter wiring harness.
2. Insert screws (3) and tighten with 2 Nm + 0.5 Nm.
3. If applicable, reconnect the temperature sensor plug
(5, Fig. 801).
4. Connect the heater to the vehicle electrical system.
1
1
2
Temperature sensor
Coolant outlet
Fig. 802 Temperature sensor removal and installation
803
8 Repair
8.5
Combustion air fan removal
and installation
NOTE
For replacement of the combustion air fan the burner does
not need to be removed.
ATTENTION
The shaft circlip may not be overstretched.
Removal
1. Remove hood (see 8.4).
2. If applicable, remove the fan (2, Fig. 803). For this
purpose remove the shaft circlip (1) from the motor
shaft using suitable pliers.
3. Disconnect plug (4) of the burner motor from the
control unit.
4. Remove screws (6) and pull motor (3) including the
motor cross member (5) off the burner housing.
5. If necessary, remove motor cross member (5) from
the burner motor (3). For this purpose loosen and
unscrew screws (7) from the motor flange.
804
Thermo S 160/230/300/350/400
Installation
1. If necessary, reconnect the burner motor (3, Fig. 803)
to the motor cross member (5). For this purpose align
the burner motor with the motor cross member.
Observe the motor cross member installation position.
Screw the countersunk screws (7) into the dedicated
recesses of the motor flange. Next tighten the
countersunk screws (7) with 5 Nm + 1 Nm.
2. If necessary, slide the coupling with magnets (10)
onto the fuel pump shaft.
3. Align motor cross member (5) with the burner housing
(11) observing the specified installation position of the
motor cross member. Align the burner motor with the
coupling by turning the burner motor shaft.
4. Secure burner motor and motor cross member with
screws (6).
5. Tighten screws (6) with 5 Nm + 1 Nm.
6. Connect plug (4) of the burner motor with the control
unit.
7. If applicable, install the fan (2). For this purpose slide
the fan onto the motor shaft and, using suitable pliers,
secure a new shaft circlip (1) onto the motor shaft.
8. Install hood (see 8.4).
Thermo S 160/230/300/350/400
8 Repair
11
5
6
10
7
2
4
8
3
1
9
1
2
3
4
5
6
7
8
9
10
11
Shaft circlip
Fan
Burner motor
Motor plug
Motor cross member
Screws (3)
Countersunk screws (3)
Hood
Screws (2)
Coupling with magnets
Burner housing
Fig. 803 Combustion air fan removal and installation
805
8 Repair
8.6
Thermo S 160/230/300/350/400
Electronic ignition unit and ignition
electrode removal and installation
Removal
1. Remove burner (see 8.2).
2. Lift off ignition electrode (2, Fig. 804) from the
electronic ignition unit by twisting a screwdriver
sideways.
3. Remove disc (3).
4. Removes screws (4) with retaining washers.
5. Pull electronic ignition unit (1) off and remove it.
6. If necessary, perform a general visual inspection (see
5.5.1) or test (see 5.5.8).
1
2
3
4
Installation
1. Bring electronic ignition unit (1, Fig. 804) into
installation position, attach ready for connection and
secure with screws (4).
2. Tighten screws (4) with 5 Nm +1 Nm.
3. Fit disc (5) onto the nozzle holder of the fuel pump
(9, Fig. 805) and align with the flame detector in the
control unit (14, Fig. 805) and the electronic ignition
unit.
4. Fit the ignition electrode (2, Fig. 804).
5. Install burner (see 8.2).
Electronic ignition unit
Ignition electrode
Disc
Screws (2)
1
2
4
3
Fig. 804 Removal of the electronic ignition unit / ignition electrode
806
Thermo S 160/230/300/350/400
8 Repair
3
4
1
2
8
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Electronic ignition unit
Screw (2)
Ignition electrode
Atomizer nozzle
Disc
Solenoid valve
Nozzle block preheater, optional
Support
Fuel pump
O-rings (2)
Filter insert
Screws (3)
Burner housing
Control unit
Heater wiring harness
Adapter wiring harness
Coupling with magnets
5
7
11
12
10
9
17
16
13
14
15
Fig. 805 Components removal and installation
807
8 Repair
8.7
Control unit removal and installation
Removal
1. Remove burner (see 8.2).
2. Disconnect solenoid valve plug (6, Fig. 806) and, if
applicable, the optional nozzle block preheater (7)
from the control unit (14).
3. Remove electronic ignition unit (see 8.6).
4. Remove hood (see 8.4).
5. Remove combustion air fan (see 8.5).
6. Disconnect the adapter wiring harness (16) and the
heater wiring harness (15) from the control unit (14).
7. Carefully pull control unit (14) from the burner housing
(13) and remove it.
Installation
1. Align control unit (14, Fig. 806) with the burner
housing (13).
2. Carefully slide control unit (14) into the burner housing
(13) as far as it will go.
3. Connect the adapter wiring harness (16) and the
heater wiring harness (15) to the control unit (14).
4. Install combustion air fan (see 8.5).
5. Install hood (see 8.4).
6. Install electronic ignition unit (1) (see 8.6).
7. Connect solenoid valve plug (6) and, if applicable, the
optional nozzle block preheater (7) to control unit (14).
8. Install burner (see 8.2).
8.8
Fuel pump removal and installation
NOTE
Make sure that any fuel leaking is immediately bound and
professionally disposed of.
Removal
1. Remove burner (see 8.2).
2. Lift off ignition electrode (3, Fig. 806) from the
electronic ignition unit by twisting a screwdriver
sideways. (see Fig. 804)
3. Remove disc (5).
4. Disconnect the solenoid valve plug (6, Fig. 806) and
the optional nozzle block preheater (7) from the
control unit (14).
5. Remove and scrap screws (12).
808
Thermo S 160/230/300/350/400
6. Pull fuel pump (9) with the solenoid valve (6) off and
remove it.
7. Remove and scrap O-rings (10) and filter insert (11).
8. If applicable, remove the nozzle block preheater (7).
For this purpose, remove support (8) from the nozzle
holder using suitable tools.
9. If necessary, remove the solenoid valve (6) from the
fuel pump (9). (see 8.9)
Installation
1. If necessary, attach solenoid valve (6, Fig. 806) to the
fuel pump (9). (see 8.9)
2. If applicable, install nozzle block preheater (7) and
mount support (8) to the nozzle holder using suitable
tools.
3. Attach new O-rings (10) and a new filter insert (11) to
the fuel pump (9).
4. Slide the coupling with magnets onto the fuel pump
shaft.
ATTENTION
In order to avoid damage to the O-rings, to not twist fuel
pump (9) during assembly.
New screws with coated threads must be used for
installing the fuel pump.
5. Align fuel pump (9) with the burner housing (13) and
bring it into installation position. Align the coupling
with magnets (17) with the burner motor by turning the
burner motor shaft.
6. Mount the fuel pump (9) using new screws (with
coated threads) (12) and tighten the screws
with 5 Nm +1 Nm.
7. Connect solenoid valve plug (6) and, if applicable, the
optional nozzle block preheater (7) to control unit (14).
8. Fit disc (5) onto the nozzle holder and align it with the
flame detector in the control unit (14) and the
electronic ignition unit (1).
9. Fit ignition electrode (3).
10. Install burner (see 8.2).
Thermo S 160/230/300/350/400
8 Repair
3
4
1
2
8
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Electronic ignition unit
Screw (2)
Ignition electrode
Atomizer nozzle
Disc
Solenoid valve
Nozzle block preheater, optional
Support
Fuel pump
O-rings (2)
Filter insert
Screws (3)
Burner housing
Control unit
Heater wiring harness
Adapter wiring harness
Coupling with magnets
5
7
11
12
10
9
17
16
13
14
15
Fig. 806 Components removal and installation
809
8 Repair
8.9
Thermo S 160/230/300/350/400
Solenoid valve removal and
installation
NOTE
The solenoid valve must be completely replaced and
may not be further dismantled! In case of replacement
or assembly and disassembly a new gasket ring must
be used.
It is not absolutely necessary to remove the fuel pump to
disassemble the solenoid valve.
Make sure that any fuel leaking is immediately bound and
professionally disposed of.
Removal
1. Remove burner (see 8.2).
2. Lift off ignition electrode (1, Fig. 804) from the
electronic ignition unit by twisting a screwdriver
sideways. (see Fig. 804)
3. Remove disc (5, Fig. 806).
4. Disconnect the solenoid valve plug (6, Fig. 806) from
control unit (14, Fig. 806).
5. Using suitable tools loosen the hexagon, wrench size
16 (6, Fig. 807) of the solenoid valve (6, Fig. 806) from
the fuel pump (9, Fig. 806) and unscrew the solenoid
valve (6).
1
2
Nut, wrench size 12
Magnetic coil (coil
with cable, plug
and plate)
3
4
5
6
Spring lock washer
Core
Tube
Hexagon, wrench
size 16
7 Lifter
8 Spring
9 Stay
10 Gasket ring
1
2
3
4
5
6
7
8
10
9
Fig. 807 Solenoid valve
Installation
1. Gasket ring (10, Fig. 807) towards the fuel pump must
be replaced. Make sure stay, spring and lifter are
correctly assembled, observe installation position
(see Fig. 807).
2. Attach solenoid valve (6, Fig. 806) to the fuel pump
(9, Fig. 806).
810
3. Using suitable tools, tighten hexagon, wrench size 16
(6, Fig. 807) of the solenoid valve with
5 Nm ± 0.5 Nm.
4. Connect the solenoid valve plug (6, Fig. 806) to the
control unit (14, Fig. 806).
5. Fit disc (5, Fig. 806) onto the nozzle holder and align
with the flame detector in the control unit (14, Fig. 806)
and the electronic ignition unit
(1, Fig. 806).
6. Fit ignition electrode (3, Fig. 806).
7. Install burner (see 8.2).
ATTENTION
If the nut, wrench size 12 (1, Fig. 807) was loosened, then
it must be tightened with a tightening torque of 1.5 Nm +
0.3 and subsequently secured using sealing wax.
8.10 Atomizer nozzle removal and
installation
Removal
1. Remove burner (see 8.2).
2. Lift off ignition electrode (2, Fig. 804) from the
electronic ignition unit by twisting a screwdriver
sideways.
3. Remove disc (5, Fig. 806).
NOTE
We recommend to use nozzle wrench item no. 66971_ for
nozzle disassembly and assembly.
4. Unscrew atomizer nozzle (4). If no nozzle wrench is
used, a tool must be used to counter on the hexagon
of the fuel pump nozzle holder (9).
Installation
1. Screw in the atomizer nozzle (4, Fig. 806) and tighten
with 20 Nm ± 2 Nm. If no nozzle wrench is used, a tool
must be used to counter on the hexagon of the fuel
pump nozzle holder (9).
2. Fit disc (5, Fig. 806) onto the nozzle holder and align
it with the flame detector in the control unit (14, Fig.
806) and the electronic ignition unit (1, Fig. 806).
3. Fit the ignition electrode (3, Fig. 806).
4. Install burner (see 8.2).
Thermo S 160/230/300/350/400
8 Repair
8.11 Combustion chamber removal and
installation
8.12 Heat exchanger removal and
installation
Removal
1. Remove burner (see 8.2).
2. Pull combustion chamber (1, Fig. 808) out of the heat
exchanger (2).
Removal
1. Remove burner (see 8.2).
2. If necessary, remove temperature sensor (see 8.3).
3. Pull combustion chamber (1, Fig. 808) out of the heat
exchanger (2) (see 8.11).
4. If necessary, loosen the exhaust line clamp on the
exhaust outlet (3).
5. If available, close water taps.
6. Loosen hose clamps on the coolant hoses, pull
coolant hoses from the coolant inlet (5) and the
coolant outlet (6) and seal with blank plugs. Caution if
coolant temperature is increased.
7. Remove screws and washers of the heat exchanger
stand (4).
8. Remove heat exchanger from the vehicle. Caution if
coolant temperature is increased.
5
2
6
1
4
3
4
1
2
3
4
5
6
Combustion chamber
Heat exchanger
Exhaust outlet
Stand
Coolant inlet
Coolant outlet
Fig. 808 Combustion chamber disassembly and
assembly
Installation
1. Slide combustion chamber (1, Fig. 808 into the heat
exchanger (2) as far as it goes.
Installation
1. Bring heat exchanger (2, Fig. 808) into installation
position and mount stand (4) using screws, nuts and
washers to the vehicle according to the mounting
points used.
2. If necessary, secure the exhaust line using a clamp to
the exhaust outlet (3).
3. Fit coolant hoses onto the coolant inlet (5) and the
coolant outlet (6) and secure with hose clamps
applying a tightening torque of 6 ± 0.6 Nm.
4. If available, open water taps.
5. Install burner (see 8.2).
6. Purge coolant circuit (see 8.14.2).
8.13 Heater removal and installation
If possible, the combustion chamber should be inserted
into the heat exchanger in such a way, that the burner
pipe welding seam is approx. in the 200° position in the
lower area.
It is permissible to change the combustion chamber
position during maintenance or after combustion chamber
replacement vs. the previous installation position.
NOTE
The fuel supply system must be subsequently purged
(see 8.14.1).
The coolant circuit must be subsequently purged
(see 8.14.2).
2. Install burner (see 8.2).
Removal
1. Remove burner (see 8.2).
2. Remove heat exchanger (see 8.12).
Installation
1. Install heat exchanger (see 8.12).
2. Install burner (see 8.2).
3. Purge coolant circuit (see 8.14.2).
811
8 Repair
8.14 Start-up after burner or heater
installation
The fuel system must be bleeded after burner installation.
The coolant circuit and the fuel system must be bleeded
after heater installation.
The vehicle manufacturer specifications must be observed.
Coolant and fuel connections must be checked for leaktightness and tight fit during the test run.
If a malfunction occurs during heater operation,
troubleshooting must be performed (see chapter 5).
8.14.1 Bleeding the fuel system
The whole fuel supply system including the fuel filter must
completely filled with fuel before initial start-up.
NOTE
Never use the fuel pump to fill / bleed the fuel system!
ATTENTION
In the event no fuel comes to the fuel pump during initial
start-up, there is a risk that the fuel pump will be damaged!
Thermo S 160/230/300/350/400
8.14.2 Bleeding of the water circuit
NOTE
The water circuit must be principally bleeded
according to manufacturer specification.
CAUTION
Risk of injuries for coolant with increased temperature.
The Aquavent 5000 (U4814) and Aquavent 6000S
(U4855) circulating pumps may only be switched on
for bleeding, after dry operation can be excluded.
The Aquavent 5000S (U4854) and Aquavent 6000SC
(U4856) circulating pumps may even in dry operation
be switched on for bleeding.
Adjust the vehicle heating system to "warm" and refill
coolant.
As soon as it is confirmed that the vehicle engine is filled
with coolant, run vehicle engine with increased idle speed.
Once the cooler thermostat opens, switch the vehicle
engine off and check the coolant level.
Refill coolant as needed.
While the vehicle engine is switched off, switch on the heater
with the circulating pump and the vehicle heating fan.
After the engine motor cooled down, the heater must
automatically start and stop as soon as the upper
switching threshold is reached.
If the heater does not start automatically, it must be
verified, whether the heater overheating protection is
triggered and the heater is interlocked.
Release the heater (see 4.6) and repeat the bleeding
process.
812
Thermo S 160/230/300/350/400
9
9 Modifications and retrofits
Modifications and retrofits
For further optimization the heaters are continuously
improved. Units in the field can usually be upgraded or
retrofitted. For this purpose respective modification kits
will be available.
901
9 Modifications and retrofits
902
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
10
10 Packing / storage / shipping
Packing / storage
and shipping
10.1 General
The heater or its components, which are sent to Spheros
for inspection or repair, must be cleaned and packaged to
ensure that handling, transport and storage will not
damage them.
ATTENTION
If a complete heater is sent back, it must be completely
drained. Packaging and/or shipping must ensure that no
fuel or coolant can leak.
Coolant inlet and outlet fittings as well as the fuel lines
must be plugged and sealed using blank plugs.
The temperatures described in section 4 may not be
exceeded during storage.
1001
10 Packing / storage / shipping
Empty page for notes
1002
Thermo S 160/230/300/350/400
Thermo S 160/230/300/350/400
A Appendix
Appendix A
Periodic maintenance
A-1
A Appendix
Periodic heater maintenance
The heater should be inspected in periodic time intervals,
latest at the beginning of the heating period (time of
increased heater usage due to present weather
conditions).
Inspection / maintenance activities
Thermo S 160/230/300/350/400
The maintenance intervals mentioned below refer to
common applications and requirements in omnibuses. If
heaters should be used in other vehicles and/or
applications, the maintenance intervals may be shortened
or extended.
In such cases please contact your dedicated Spheros
partner for further information.
Important information
Inspection
result
OK
1. Electrical connections
a) Loosen electrical plug connections to the wiring harness, inspect for
oxidation, spray and reconnect after completing point 5.
b) Inspect electrical fuses for oxidation and/or contact
resistances.
2. Heat exchanger
a) Inspect for dark burn marks on the paint (local overheating).
b) Inspect for leak marks.
Use suitable contact
spray, e.g. special
contact spray (order no.
101322).
Determine overheating
cause as needed (e.g.
water circulation system);
check overheat
temperature limiter.
c) Clean heater exterior and interior.
3. Fuel system
a) Inspect fuel lines and connections for leakage.
b) Replace fuel filter insert with gasket.
c) If available, open fuel shut-off valves
d) Fuel pump and fuel lines.
NOTE: Observe technical information if bio diesel or FAME
is used!
e) Replace fuel screen with gasket in the pump.
Ensure connections to
fuel flow and return lines
are sealed tight!
Re-tighten screw
connections and hose
clamps.
Replace pump and pipes
every 5 years.
Observe technical bio
diesel / FAME
information!
4. Burner head
a) Inspect combustion air intake opening for clear passage.
b) Inspect hood for damage.
Replace damaged hood
c) Inspect housing interior for fuel accumulations caused by leaking.
d) Clean flame detector inspection glass.
e) Inspect condition of the ignition electrodes.
Replace bent electrodes.
f)
In case of coke build-up
shorten fuel filter
replacement interval.
Replace atomiser nozzle.
g) Check nut-and-washer assemblies M8 (2ea) for burner attachment for
tight fit, torque to 7.5 +1 Nm.
5. Exhaust system
a) Inspect exhaust line for clear passage, clean as needed.
b) Remove combustion chamber from heat exchanger,
inspect both parts for damage and contamination, clean and
replace as needed.
c) Insert combustion chamber and mount burner head. Ensure tight
connection to heat exchanger.
d) Connect electrical plug contacts.
6. Water system
a) Clean filter insert, if available.
c) Open water shut-off valves, if available.
7. Functional check
a) Open shut-off valve of the return line, if available.
b) Check heater functionality.
c) Check for smoke development during run-down, replace nozzle as
needed.
A-2
after at least 10 min.
heater operation.
not
OK
Measured values
Executed
repairs
Spheros-Service
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Spheros
BR
CND
RC
D
Brasilien
Spheros Brasil S.A.
Tel. +55 54 21015700
Canada
Spheros North America,
Inc., Canton, MI
1-888-270-2226
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Spheros (Yangzhou)
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Tel. +86 514 5881 226
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P
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Tel. +52 728 2 84 01 64
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Spheros
TR
E
USA
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UA
Türkei
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Sistemleri A.S.
Tel. +90 212 672 47 72
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Buixalleu, Girona
Tel. +34 972 874 923
USA
Spheros North America,
Inc., Canton, MI
1-888-270-2226
Südafrika
Spheros SA (Pty) Ltd.
Tel. +27 21 761 9971
Webasto-Europa
HR
Kroatien
siehe Slowenien
CH
Schweiz
4123 Allschwil/BL
Tel. +41 61 4869580
CZ
DK
Tschechien
140 00 Praha 4
Tel. +420 2 41045450-7
Dänemark
DK-2610 Rødovre
Tel. +45 44 522000
EE
Estland
11214 Tallinn
Tel. +372 651 9309
LV
Lettland
1004 Riga
K. Ulmana gatve 2
Tel. +371 7807873
LT
Litauen
2300 Vilnius
Jočionių g. 14
Tel. +370 5 275 81 81
F
Frankreich
91280 Tigery
Tel. +33 (0) 169 138383
Ukraine
Spheros Elektron
GU GmbH
Tel. +38 032 291 37 63
Webasto-Europa
A
Österreich
1230 Wien
Tel. +43 1 6043780
B
Belgien
8263 BC Kampen (NL)
Tel. +31 38 3371 137
GB
Großbritannien
Dn4 5JH Doncaster
Tel. +44 1302 322232
BIH
Bosnien-Herzegovina
siehe Slowenien
GR
Griechenland
10442 Athen
Tel. +30 210 5196800
BG
Bulgarien
1839 Sofia
Tel. +359 2 9420-555
H
Ungarn
1135 Budapest
Tel. +36 1 3502337
I
Italien
40062 Molinella (BO)
Tel. +39 051 690 6131
BY
Weißrussland
220004 Minsk
Tel. +37 50172201894
Webasto-Europa
IS
Island
210 Gardabaer
Tel. +354 5672330
KZ
Kasachstan
480019 Almaty
Tel. +7 3272 312650
L
Luxemburg
8263 BC Kampen (NL)
Tel. +31 38 3371 137
Webasto-Europa
SLO
Slowenien
1000 Ljubljana
Tel. +386 1 2008710
RA
Argentinien
1424 Buenos Aires
Tel. +54 11 45242117
Webasto-Amerika
RCH
Chile
OF907 Santiago de Chile
Tel. +56 22 344311
MK
Mazedonien
siehe Slowenien
NL
Niederlande
8263 BC Kampen
Tel. + 31 38 3371137
N
Norwegen
1386 Asker
Tel. +47 66 753000
RC
PL
Polen
05-092 Lomianki
Tel. +48 22 7517787
J
Japan
J-222-0033 Yokohama
+81 45 4741761
RO
Rumänien
075100, Otopeni, llfov
Tel. +40 730 084 562
ROK
Korea (Rep.)
626-140 Yangsan-si,
Gyeongsangnam-do
Tel. +82 55 781 1002
MGL
Mongolei
Ulaanbaatar
Tel. +976 11 318138
RUS
Russland
107 065 Moscow
Tel. +7 095 7770245
SRB
Serbien und
Montenegro
siehe Slowenien
CG
SK
S
Slowakische Republik
04012 Košice
Tel. +421 55 7871000
Schweden
19181 Sollentuna/
Stockholm
Tel. +46 8 923000
Webasto-Asien
China
Beijing
Tel. +852 28 118230
Webasto-Australien
AUS
Australien
2232 NSW Kirrawee
Tel. +61 2 85364800
NZ
Neuseeland
2232 NSW Kirrawee
Tel. +61 2 85364800
Für diese Druckschrift wurde ein
umweltschonendes, aus 100%
chlorfrei gebleichtem Zellstoff
hergestelltes Papier verwendet.
Printed in Germany · 12.12
Druck: Steffendruck Friedland
Änderungen vorbehalten
Subject to modification
Sous réserve de modifications
© Spheros GmbH
Spheros GmbH
Friedrichshafener Straße 9-11 · D-82205 Gilching
Tel. +49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de
Technical Information
05-2011
Service
Combustion Chamber Replacement in Thermo Series
Ongoing optimization of parts quality and the avoidance of unnecessary version
variety are firmly established in the product development process at Spheros.
Against this background, we point out that with a need for renewal or
replacement of a combustion chamber in one of the previous generation Thermo
230/300/350 heaters now the optimized version of Thermo S 230/300/350
heaters can be used.
In length and diameter it is identical to the Thermo
230/300/350 series.
The optimization lies in the two ringshaped reinforcements at the end of
the combustion chamber.
Advantages of Thermo S combustion chamber:
Prevention of warping due to thermal stresses during burner operation
Easier to disassemble the combustion chamber during maintenance
Reduce of the lifecycle costs due to significantly increased service life of the
combustion chamber (depending on operating conditions)
Spheros Recommendation
In future, during renewal of combustion chamber in Thermo 230/300/350
heaters, use new P/N 2710229A of Thermo S series.
prepared on 18.08.2011
Spheros Europa GmbH, After Sales
Friedrichshafener Straße 9-11, 82205 Gilching · Tel.+49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de
Technical Information
06-2011
Service
Identification of GENUINE Spheros atomizing nozzles for heaters
Spheros label since
Spheros ident.
Heating power of the
2008
number
heater (e.g. 35kW)
Nomenclature of production date recurring since 2008
1st letter => production month
2nd letter => production year
(A - January/M - December)
(A - 2001/ K - 2010)
A => January G => July
A => 2001
F => 2006
B => February H => August
B => 2002
G => 2007
C => March
I => September
C => 2003
H => 2008
D => April
K => October
D => 2004
I => 2009
E => May
L => November
E => 2005
K => 2010
F => June
M => December
BK
Feb 2010
from 2011 it starts with A
again
A => 2011 B => 2012
!!! Attention: J does not exist!!!
Note: Under proper storage conditions of GENUINE Spheros atomizing
nozzles, the highest quality standards are guaranteed even with older
production date!
prepared on 18.08.2011
Spheros Europa GmbH, After Sales
Friedrichshafener Straße 9-11, 82205 Gilching · Tel.+49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de
Technical Information
06-2011
Service
Overview on Spheros atomizing nozzles for heaters
Series
Thermo S
Thermo E
Thermo
DW
DBW
Designation
Power
Ident. number
Spheros
label
160
16kW
2710233B
yes
230
23kW
2710234B
yes
300
30kW
2710235B
yes
350
35kW
2710236B
yes
400
40kW
2710237B
yes
200
20kW
2711057A
yes
320
32kW
2711056A
yes
230
23kW
470716Z
no
300
30kW
2710235B
yes
350
35kW
2710236B
yes
230
23kW
470716Z
no
300
30kW
2710235B
yes
350
35kW
2710236B
yes
2020.26/31/65
23kW
341304Z
no
2020.35
23kW
470716Z
no
300.10
30kW
391697Z
no
ab 300.18
30kW
470724Z
no
ab 350.08
35kW
469556Z
no
prepared on 18.08.2011
Spheros Europa GmbH, After Sales
Friedrichshafener Straße 9-11, 82205 Gilching · Tel.+49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de
Technical Information
09-2012
Service
Initial start-up of Thermo, Thermo S and E Heaters
It is mandatory to read through the operating and maintenance instructions as well as the
installation instructions before starting the heater.
The safety precautions given in the above mentioned documents must be considered!
The heaters are adjusted in the factory and can be used unlimited without a change of the
CO2 adjustment up to an altitude of 1500 m above MSL and up to 2000 m above MSL if that
is a short stay in such conditions (pass crossing, break).
In case of a permanent heater operation above 1500 m the CO2 setting should be readjusted,
due to a negative change of the exhaust gas values in result of the decreased air density.
It is also recommended to adjust the CO2 content according to the technical data if
combustion air supply or exhaust gas applications are used.
After heater installation, bleed the water system and the fuel supply system carefully. In this
process it is mandatory to fill the suction line and the fuel filter of the heater completely.
Spheros recommends the usage of a separate bleeding unit. Follow the appropriate
instructions provided by the vehicle manufacturer. Verify the fuel supplied to the heater is
bubble-free.
NOTE:
Never use the fuel pump to fill / bleed the fuel system!
Generally, the hook-up of the heater to the vehicle power grid must be done only after filling
/ bleeding of the fuel system in order to prevent a premature start of the fan motor/fuel
pump.
Conduct a test run of the heater to check all the water and fuel connections for leaks and to
ensure that they are secure. If the heater suffers a fault during operation, the fault must be
located and remedied according to given in the shop manual instructions.
ATTENTION:
In the event no fuel comes to the fuel pump during initial start-up, there is a risk that the fuel
pump will be damaged!
30.09.2012
Spheros Europa GmbH, After Sales
Friedrichshafener Straße 9-11, 82205 Gilching · Tel.+49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de
Technical Information
01-2013
Service
Overview fuel pumps for heaters
The optimized fuel pumps can clearly handle better fuel blowholes.
Blowholes in the fuel can originate by leakage in the bus fuel feed and also by gas
evolution in the fuel by elevated low-pressure.
Ignition miss and therefore the danger of heater locking will be reduced to a
minimum with the new pump.
The fuel pumps can be exchanged 1:1 in the fieldAll spare part kits contain fastening bolts.
Heater
Thermo
Thermo S
Fuel pump
23-35 kW
82233_
23-35 kW
11114892_
2-string
11112778C
23-35 kW
11114892_
11112779C
Heating cartridge and
thermostate incl. (83933C)
16 kW
11114895_
11118533A *
11114896_
11118534A *
11114897_
11118535A *
11113950_
11118536A *
23-35 kW
2-string
40 kW
Thermo E
Spare-part-kit
fuel pump
20-32 kW
2-string
* Scope of delivery incl. clutch
For heaters of the Thermo series we recommend to exchange als the old coupling
(20654A) with the new one (11117847A) together with the pump.
For 1-string pump demand, please contact us.
erstellt am 15.4.2013
Spheros Europa GmbH, After Sales
Friedrichshafener Straße 9-11, 82205 Gilching · Tel.+49 (0) 8105 7721 887 · Fax +49 (0) 8105 7721 889
www.spheros.de · service@spheros.de