Pilot Light Ignition
Agricultural Animal Confinement Building Heaters
Installation
and Service Guide
150-22003
Foreword
The purpose of this Service Guide is to provide detailed
instructions and information for the installation, maintenance,
troubleshooting and repair of L.B. White pilot ignition agricultural
heaters. By consulting specific sections within the guide, you
will become acquainted with components and operation of the
equipment as well as proper procedures to use during trouble
analysis and repair. Parts illustrations and information for all
L.B. White pilot ignition heaters is included. Illustrations in the
various sections may not necessarily depict the actual heater
model and are intended for reference only.
It is very important when using the guide to pay particular
attention to any Warning or Caution statements printed
throughout the guide, identifying areas where care must be
exercised.
This Service Guide covers the majority of problems which may
arise. However, as with any product, certain problems may be
encountered which have not been covered. If such problems
arise, please call Technical Service at 1-800-345-7200 from
7:00 a.m. to 5:00 p.m. Central Standard Time to address these
problem areas.
It is L.B. White’s policy to continually upgrade our service
network, therefore, new ideas and comments are welcomed for
incorporation into this guide.
GENERAL HAZARD WARNING
■ Failure to comply with the precautions and instructions provided within this guide, can
result in:
— Death
— Serious bodily injury or burns
— Property damage or loss from fire or explosion
— Asphyxiation due to lack of adequate air supply or carbon monoxide poisoning
— Electrical shock
■ Read this Service Guide before installing or servicing this heater.
■ Only properly-trained service people should repair or install L.B. White heaters.
■ Replacement labels are available at no charge. For assistance, contact L.B. White at
1-800-345-7200.
WARNING
■ Proper gas supply pressure must be provided to the inlet of the heater.
■ Refer to dataplate for proper gas supply pressure.
■ Gas pressure in excess of the maximum inlet pressure specified at the heater inlet can cause
fires or explosions.
■ Fires or explosions can lead to serious injury, death, building damage or loss of livestock.
■ Gas pressure below the minimum inlet pressure specified at the heater inlet may cause
improper combustion.
■ Improper combustion can lead to asphyxiation or carbon monoxide poisoning and therefore
serious injury or death to humans and livestock.
WARNING
Fire and Explosion Hazard
■ Not for home or recreational vehicle use.
■ Installation of this heater in a home or
recreational vehicle may result in a fire or
explosion.
■ Fire or explosions can cause property
damage or loss of life.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
FOR YOUR SAFETY
If you smell gas:
■ Open windows.
■ Don't touch electrical switches.
■ Extinguish any open flame.
■ Immediately call your gas supplier.
WARNING
Fire and Explosion Hazard
■ Keep solid combustibles a safe distance
away from the heater.
■ Solid combustibles include wood or paper
products, feathers, straw, and dust.
■ Do not use the heater in spaces which
contain or may contain volatile or airborne
combustibles.
■ Volatile or airborne combustibles include
gasoline, solvents, paint thinner, dust
particles or unknown chemicals.
■ Failure to follow these instructions may
result in a fire or explosion.
■ Fire or explosions can lead to property
damage, personal injury or loss of life.
Table of Contents
Section 1 General Information
Section/Page
Basic Unit Description and Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1
Key Markings; Purpose and Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.2
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3
Section 2 Installation Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.1
Gas Supply
- Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.2
- Tank Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.3
- Tank Location and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.4
- LP Gas Tank Manifolding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.5
- Manual Shut-Off Valve, Hose and Regulator Assembly . . . . . . . . . . . . . . . . . . . .2.6
- Sediment Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.7
Electrical Supply
- Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.8
- Thermostat Wiring
Models:
346/348, 377/379, 408/410 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.9-1
AS040 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.9-2
AB200 and AB250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.9-3
Indoor Installation
- Hanging Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.10
- Air Diverters
Two-Piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.11-1
One-Piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.11-2
Section 3 Operation Instructions
Start-Up and Shut-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1
Variable Heat Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.2
Section 4 Preventative Maintenance
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.1
Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.2
Section 5 Troubleshooting Instructions
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.1
Section 6 Component Testing
Voltage Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.1
Continuity Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.2
Thermocouple and Power Unit Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.3
High Limit Switch Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.4
Section 7 Wiring Diagrams
Electrical Connection and Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.1
General
Information
Basic Unit Description and Application
Pilot ignition agricultural building heaters are direct-fired,
non-vented heaters used in the heating of animal
confinement buildings (examples: swine, chicken, and
turkey). These heaters utilize a system that ignites the gas
by a conventional pilot flame rather than by direct spark or a
hot surface igniter. L.B. White offers you the most
dependable pilot system in the industry. Tested and proven
over time, these heaters provide simple yet reliable
operation.
As a non-vented heater, adequate ventilation must be
provided to ensure fresh air for combustion and removal of
combustion by-products from the building.
This style of heater is offered in a wide range of input ratings,
some with variable heat control, to help manage heating
needs efficiently.
All heaters referred to in this guide are to be mounted inside
the building at appropriate locations to help provide proper
warm air flow in the room being heated.
Key Markings; Purpose and Location
Markings constitute safety related information such as the
dataplate, start-up/shut-down instructions, warnings, etc.
that are applied on the heater to allow the qualified service
person or end user to operate the heater in a safe manner.
Familiarize yourself with the location and content of all
markings. Location may vary depending on model. If any
markings are damaged or unreadable, replace the markings
immediately. Contact the L.B. White Company.
A. Dataplate
Typical Location:
Interior or exterior of burner end access panel.
Part No.:
Varies with design sequence and model number.
Contact L.B. White Co.
CONFIGURATION NO. AHPD210000
SERIAL NO.:
DES I GN
ERI CA N
AM
A
G S
SS
OCI ATI O
N
MODEL AB250
AW060
A
Purpose:
Used for identification of model number, and
configuration number and also critical information
such as safe clearances to combustibles, burner
manifold pressure, maximum and minimum
allowable inlet pressures, etc.
CE
RTI FI ED
MAXIMUM INPUT: 250,000
60,000 BTUH
TYPE FUEL: PROPANE VAPOR WITHDRAWAL
BURNER MANIFOLD PRESSURE 10.0 IN W.C.
AT MAXIMUM INPUT
ELECTRICAL: 115 VOLTS A.C. 60 HZ SINGLE PHASE 1.5 AMPS
MIN. CLEARANCES FROM HEATER TO ADJACENT COMBUSTIBLE MATERIALS: REAR 1 FT SIDES 1 FT
TOP TO CEILING 1 FT BLOWER OUTLET 6 FT AND FUEL CONTAINER 6 FT
VENTILATION: 240 CFM OF AIR REQUIRED TO SUPPORT COMBUSTION.
MAXIMUM 13.5 INCHES W.C. AND MINIMUM 11.5 INCHES W.C. GAS SUPPLY PRESSURE
ACCEPTABLE AT INLET 0F HEATER FOR PURPOSE OF INPUT ADJUSTMENT.
POSITION HEATER AWAY FROM LIVESTOCK
AGRICULTURAL BUILDING HEATER
L. B. WHITE CO., INC. W6636 L.B. WHITE ROAD ONALASKA, WI 54650 608/783-5691
B. Start Up and Shut Down Procedures
Purpose:
Provides the basic information to safely start up and
shut down the heater and also provides cautionary
information relative to various safety aspects of
installation and application.
Typical Location:
Next to dataplate.
Part No.:
150-20158
August 1999
1.1-1
1
General
Information
Heater Specifications
Model
SPECIFICATIONS
346
Heaters Using
Control Valves
Less Internal
Low Pressure
Regulator and
Gas Shut Off
(Control Valve
Part #50002309)
Inlet Gas
Supply
Pressure
760 CFM
10.5 in.
W.C.
7.0 in.
W.C.
11.0 in.
W.C.
7.0 in.
W.C.
1.2-1
1
N/A
11.0 in.
W.C.
7.0 in.
W.C.
N/A
N/A
N/A
N/A
3.6 in.
W.C.
11.5 in.
W.C.
4.5 in.
W.C.
11.5 in.
W.C.
4.5 in.
W.C.
11.5 in.
W.C.
3.6 in.
W.C.
MIN.
11.5 in.
W.C.
3.6 in.
W.C.
11.5 in.
W.C.
4.5 in.
W.C.
11.5 in.
W.C.
4.5 in.
W.C.
11.5 in.
W.C.
3.6 in.
W.C.
11 in. W.C.
4 in. W.C.
11 in. W.C.
4 in. W.C.
11 in. W.C. 3.5 in. W.C.
11 in. W.C. 3.4 in. W.C.
MAX. 2.78 lbs. 60 cu. ft.
N/A
MIN.
5.32 lbs. 115 cu. ft. 7.87 lbs. 170 cu. ft. 1.85 lbs. 40 cu. ft.
N/A
N/A
N/A
N/A
N/A
.69 lbs.
15 cu. ft.
Ball Bearing
1/12 H.P.
1700 RPM
1/5 H.P.
1100 RPM
1/3 H.P.
1100 RPM
1/30 H.P.
1725 RPM
115/60/1
STARTING
Net Weight (lbs.)
Shipping Weight (lbs.)
220 CFM
11.5 in.
W.C.
Electrical Supply
(Volts/Hz/Phase)
Minimum Safe
Distances From
Nearest
Combustible
Materials
L.P.
Natural
Gas
Gas
40,000
15,000
MAX.
Sleeve Bearing
Dimensions (Inches)
LxWxH
L.P.
Natural
Gas
Gas
170,000
N/A
AS040
13.5 in. W.C.
Motor Characteristics
Amp Draw
410
10.0 in. W.C. 4.0 in. W.C. 10.0 in. W.C. 4.0 in. W.C. 10.0 in. W.C. 4.0 in. W.C.
Burner
Manifold
Pressure
Fuel Consumption
Per Hour
408
600 CFM
MAX.
MIN.
379
L.P.
Natural
Gas
Gas
115,000
N/A
250 CFM
Burner
Manifold
Pressure
Inlet Gas
Supply
Pressure
377
L.P.
Natural
Gas
Gas
60,000
N/A
Maximum Input (BTUH)
Minimum Input (BTUH)
Ventilation Air Required
to Support Combustion
Heaters Using
Control Valves
With Internal
Low Pressure
Regulator and
Gas Shut Off
348
3.0
6.0
6.5
4.5
CONTINUOUS
OPERATION 1.0
1.6
2.2
1.5
23 x 16 1/2 x 24
24 x 19 x 30
21 1/4 x 14 1/2 x 16 3/4
1 ft.
1 ft.
1 ft.
6 in.
6 in.
6 in.
21 1/4 x 11 1/4 x 24
TOP
SIDES
BACK
BLOWER
OUTLET
GAS
SUPPLY
6 in.
6 in.
6 in.
4 ft.
55
61
6 ft.
L.P. Gas Supply — 6 ft. (1.83 m)
Natural Gas Supply — N/A
90
110
100
129
39
43
August 1999
General
Information
Heater Specifications
Model
AB200
SPECIFICATIONS
L.P.
Gas
Natural
Gas
Maximum Input (BTUH)
Minimum Input (BTUH)
Ventilation Air Required
to Support Combustion
Heaters Using
Control Valves
With Internal
Low Pressure
Regulator and
Gas Shut Off
Heaters Using
Control Valves
Less Internal
Low Pressure
Regulator and
Gas Shut Off
(Control Valve
Part #50002309)
Inlet Gas MAX.
Supply
Pressure MIN.
200,000
N/A
250,000
160,000
760 CFM
1100 CFM
N/A
13.5 in. W.C.
11.5 in.
W.C.
7.0 in.
W.C.
N/A
N/A
10.0 in.
W.C.
4.0 in.
W.C.
11.5 in.
W.C.
4.5 in.
W.C.
N/A
N/A
11.5 in.
W.C.
4.5 in.
W.C.
N/A
N/A
11 in.
W.C.
4.0 in.
W.C.
N/A
N/A
MAX.
9.26
lbs.
200
cu. ft.
MIN.
N/A
N/A
11.57
lbs.
7.41
lbs.
250
cu. ft.
160
cu. ft.
Burner
Manifold
Pressure
Ball Bearing
Motor Characteristics
1/5 H.P.
1100 RPM
1/3 H.P.
1075 RPM
Electrical Supply
(Volts/Hz/Phase)
Dimensions (Inches)
LxWxH
Minimum Safe
Distances From
Nearest
Combustible
Materials
Net Weight (lbs.)
Shipping Weight (lbs.)
August 1999
Natural
Gas
N/A
Inlet Gas MAX.
Supply
Pressure MIN.
Amp Draw
L.P.
Gas
N/A
Burner
Manifold
Pressure
Fuel Consumption
Per Hour
AB250
115/60/1
STARTING
12
14.5
CONTINUOUS
OPERATION
4.0
4.8
24 3/4 x 20 x 30
30 3/4 x 18 1/4 x 28 1/4
TOP
SIDES
BACK
BLOWER
OUTLET
GAS
SUPPLY
1 ft.
1 ft.
1 ft.
6 ft.
L.P. Gas Supply — 6 ft. (1.83 m)
Natural Gas Supply — N/A
98
120
109
126
1.2-2
2
General
Information
Safety Precautions
WARNING
■
■
■
■
■
Asphyxiation Hazard
the L.B. White Company to determine combustion air
Do not use this heater for heating human living quarters.
ventilation requirements of the heater.
Do not use in unventilated areas.
■ Lack of proper ventilation air will lead to improper
The flow of combustion and ventilation air must not be
combustion.
obstructed.
■ Improper combustion can lead to carbon monoxide
Proper ventilation air must be provided to support the
poisoning in humans leading to serious injury or death.
combustion air requirements of the heater being used.
Symptoms of carbon monoxide poisoning can include
headaches, dizziness and difficulty in breathing.
Refer to the specification section of this guide, the
heater’s Owner’s Manual, heater dataplate, or contact ■ Symptoms of improper combustion affecting livestock
can be disease, lower feed conversion, or death.
FUEL GAS ODOR
LP gas and natural gas have man-m
made odorants added specifically for detection of fuel gas leaks.
If a gas leak occurs, you should be able to smell the fuel gas.
THAT’S YOUR SIGNAL TO GO INTO IMMEDIATE ACTION!
■ Do not take any action that could ignite the fuel gas. Do
not operate any electrical switches. Do not pull any
power supply or extension cords. Do not light matches
or any other source of flame. Do not use your telephone.
■ Get everyone out of the building and away from the area
immediately.
■ Close all propane (LP) gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the meter
if you use natural gas.
■ Propane (LP) gas is heavier than air and may settle in low
areas. When you have reason to suspect a propane
leak, keep out of all low areas.
■ Natural gas is lighter than air and can collect around
rafters or ceilings.
■ Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
■ Stay out of the building and away from area until
declared safe by the firefighters and fuel gas supplier.
■ FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly trained
service people must repair the leak, check for further
leakages, and then relight the appliance for you.
ODOR FADING -- NO ODOR DETECTED
■ Some people cannot smell well. Some people cannot
smell the odor of the man-m
made chemical added to
propane (LP) or natural gas. You must determine if you
can smell the odorant in these fuel gases.
■ Learn to recognize the odor of propane (LP) gas and
natural gas. Local propane (LP) gas dealers and your
local natural gas supplier (utility) will be more than
happy to give you a scratch and sniff pamphlet. Use it to
become familiar with the fuel gas odor.
■ Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor. Odors present in
animal confinement buildings can mask fuel gas odor.
■ The odorant in propane (LP) gas and natural gas is
colorless and the intensity of its odor can fade under
some circumstances.
■ If there is an underground leak, the movement of gas
through the soil can filter the odorant.
■ Propane (LP) gas odor may differ in intensity at different
levels. Since propane (LP) gas is heavier than air, there
may be more odor at lower levels.
■ Always be sensitive to the slightest gas odor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
ATTENTION -- CRITICAL POINTS TO REMEMBER!
■ Propane (LP) gas and natural gas have a distinctive odor.
Learn to recognize these odors. (Reference Fuel Gas
Odor and Odor Fading sections above.
■ Even if you are not properly trained in the service and
repair of the heater, ALWAYS be consciously aware of the
odors of propane (LP) gas and natural gas.
■ If you have not been properly trained in repair and service
of propane (LP) gas and natural gas fueled heaters, then
do not attempt to light heater, perform service or repairs,
or make any adjustments to the heater on propane (LP)
gas or natural gas fuel system.
■ A periodic “sniff test” around the heater or at the
heater’s joints; i.e. hose, connections, etc., is a good
safety practice under any conditions. If you smell even a
small amount of gas, CONTACT YOUR FUEL GAS
SUPPLIER IMMEDIATELY. DO NOT WAIT!
1.3-1
1
August 1999
General
Information
Safety Precautions
1. Do not attempt to install, repair, or service this heater
or the gas supply line unless you have continuing
expert training and knowledge of gas heaters.
Qualifications for service and installation of this
equipment are as follows:
a. To be a qualified gas heater service person, you
must have sufficient training and experience to
handle all aspects of gas-fired heater installation,
service and repair. This includes the task of
installation, troubleshooting, replacement of
defective parts and testing of the heater. You must
be able to place the heater into a continuing safe
and normal operating condition. You must
completely familiarize yourself with each model
heater by reading and complying with the safety
instructions, labels, Owner’s Manual, etc., that is
provided with each heater.
b. To be a qualified gas installation person, you must
have sufficient training and experience to handle
all aspects of installing, repairing and altering gas
lines, including selecting and installing the proper
equipment, and selecting proper pipe and tank
size to be used. This must be done in accordance
with all local, state and national codes as well as
the manufacturer’s requirements.
2. All installations and applications of L.B. White heaters
must meet all relevant local, state and national codes.
Included are L.P. gas, natural gas, electrical, and
safety codes. Your local fuel gas supplier, a local
licensed electrician, the local fire department or
similar government agencies, or your insurance agent
can help you determine code requirements.
a. For U.S.A. installations and applications:
-- ANSI/NFPA 58, latest edition, Standard for
Storage and Handling of Liquefied Petroleum
Gas and/or
-- ANSI Z223.1/NFPA 54, National Fuel Gas Code
-- ANSI/NFPA 70, National Electrical Code.
b. For Canadian Installations and Applications:
3. Do not move, handle, or service heater while in
operation or connected to a power or fuel supply.
4. Observe and obey all instructional warnings pertaining
to cleaning procedures located on each heater.
5. For safety, this heater is equipped with a manual reset
high-limit switch and where applicable, an air proving
switch. Never operate this heater with any safety
device that has been bypassed. Do not operate this
heater unless all of these features are fully
functioning.
6. Do not operate the heater with its door open or panel
removed.
7.
Do not locate fuel gas containers or fuel supply hoses
anywhere near the blower outlet of the heater.
8. Do not block air intakes or discharge outlets of the
heater. Doing so may cause improper combustion or
damage to heater components leading to property
damage or animal loss.
9. The hose assembly shall be visually inspected on an
annual basis. If it is evident there is excessive
abrasion or wear, or if the hose is cut, it must be
replaced prior to the heater being put into operation.
The hose assembly shall be protected from animals,
building materials, and contact with hot surfaces
during use. The hose assembly shall be that specified
by the manufacturer. See parts list.
10. Check for gas leaks and proper function upon heater
installation, before building repopulation or when
relocating.
11. This heater should be inspected for proper operation
by a qualified service person before building
repopulation and at least annually.
12. Inform the customer to always turn off the gas supply
to the heater if the heater is not going to be used in
the heating of livestock.
13. This heater is equipped with a three-prong (grounding)
plug for your protection against shock hazard and
must be plugged directly into a properly grounded
-- CAN1-B149.1 or CAN1-B149.2 Installation
Codes
-- CSA C22.1 Part 1 Standard Canadian Electrical
Code. CSA C22.2 No. 3, Electrical Features of
Fuel-Burning Equipment.
August 1999
1.3-2
2
General
Information
Safety Precautions
three-prong receptacle. Failure to use a properly
grounded receptacle can result in electrical shock,
personal injury, or death.
14. If gas flow is interrupted and flame goes out, do not
relight the heater until you are sure that all gas that
may have accumulated has cleared away. In any
event, do not relight the heater for at least 5 minutes.
1.4-3
3
15. Non-hanging heater installations that do not use an
approved gas hose assembly must conform to local
gas code requirements. In absence of local codes,
follow ANSI/NFPA58, Standard for Storage and
Handling of Liquefied Petroleum Gas.
August 1999
Installation
Instructions
General Information
WARNING
Fire or explosion hazard.
Can cause property damage, severe injury or death.
■ Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
■ To avoid dangerous accumulation of fuel gas, turn off
gas supply at the appliance service valve before
starting installation, and perform gas leak test after
completion of installation.
■ Do not force the gas control knob. Use only your hand
to turn the gas control knob. Never use any tools. If
the knob will not operate by hand, the control should
be replaced by a qualified service technician. Force or
attempted repair may result in fire or explosion.
1. Read all safety precautions and follow L. B. White
recommendations when installing this heater. If
during the installation or relocating of heater, you
suspect that a part is damaged or defective, call a
qualified service agency for repair or replacement.
2. Insure that all accessories that ship within the heater
have been removed from inside of heater and
installed. This pertains to air diverters, hose,
regulators, etc.
3. A qualified service agency must check for proper
operating gas pressure upon installation of the heater.
4. L.B. White heaters can be configured for use with
either L.P. gas vapor withdrawal or natural gas.
Consult the dataplate, located on interior of the burner
August 1999
end or motor end access door, for the gas
configuration of the specific heater. Do not use the
heater in an L.P. gas liquid withdrawal system or
application. If you are in doubt, contact the L.B. White
Co., Inc.
5. Eventually, like all electrical/mechanical devices, the
thermostat can fail. Thermostat failure may result in
either an underheating or overheating condition which
may damage critical products and/or cause animal
injury or death. Critical products and/or animals
should be protected by a separate back-up control
system that limits high and low temperatures and also
activates appropriate alarms.
6. Take time to explain to your customer how to operate
and maintain the heater by using this Service Guide.
Make sure your customer knows how to shut off the
gas supply to the building and also to the individual
heater. In the event of an emergency, have your
customer contact you or the fuel gas supplier if you
have any questions.
7. Any defects found in performing any of the service or
maintenance procedures must be eliminated and
defective parts replaced immediately. The heater
must be retested by properly qualified service
personnel before placing the heater back into use.
8. Do not exceed input rating stamped on the dataplate
of the heater. Do not exceed the burner manifold
pressure stated on the dataplate. Do not use an
orifice size different than specified for the specific
input rating of this heater, fuel type, configuration and
altitude.
2.1-1
1
Installation
Instructions
Pipe Sizing
GENERAL INFORMATION
c. The information in the pipe sizing tables was obtained
from Engineered Control International, Inc., L.P. Gas
Serviceman’s Manual L545.
Pipe sizing is critical to the proper operation of any gas
heating system. However, piping is dependent on several
factors:
d. Do not attempt gas supply line selection or installation
unless you are properly trained and qualified.
1. Total gas load expressed in BTUH.
2. The gas pressure to be supplied through the piping
system. This pressure may be expressed in pounds of
pressure per square inch (psi) or inches of water
column (W.C.).
e. All gas supply lines must be leak checked after
installation and when pressurized to provide a safe
installation. Use only certified, approved leak
detectors.
3. Distance that the gas must travel to feed the heater
furthest from the regulator.
This section provides a basic explanation of how to size
piping for the heaters through the use of pipe sizing tables
and a typical example. In all cases with this example, we will
be using only pounds of pressure, expressed as 5 psi and not
inches of water column.
f. This is one example showing how to size piping for a
building. Installation layouts differ as do the
pressures being supplied to piping, whether you are
using for LP gas or natural gas and the material (pipe
or copper tubing) being used.
INSTRUCTIONS
a. Determine total gas demand for entire system, by
adding up BTUH input from heater dataplates and
adding demand for any other gas-fired appliances and
any future heaters.
a. Black iron pipe only was used in this example as it is
less expensive per foot than copper tubing and,
therefore, more commonly used. However, the same
selection process using copper tubing may be done if
so desired. Refer to appropriate pipe sizing tables for
copper tubing. All pipe diameters given are measured
in inner diameter (I.D.). Piping planning and
installation must be done by an experienced, qualified
LP gas installation agency.
b. Measure the length of piping required from outlet of
first-stage regulator to the appliance furthest away.
No other length is necessary to do the sizing. In this
example the distance from first-stage regulator to
appliance furthest away is 230 ft.
b. The minimum pipe size normally used in many
situations is 1/2 in. nominal.
c. Make a sketch of the piping system and installation.
See Fig. 1.
Fig. 1
LP Tank
First Stage Regulator (Tank Pressure Reduced to 5 psig)
A
50'
20'
50'
F
50'
E
50'
D
30'
C
30'
B
50'
H
G
Heater
Second Stage Regulator, 5 psig Inlet
20'
40'
300'
2.2-1
1
August 1999
Installation
Instructions
Pipe Sizing
EXAMPLE
(Refer to Fig 2)
IMPORTANT: If exact length is not on chart, use next longer
length. Select the size of pipe that shows at least as much
capacity as needed for each piping section.
c. Section C to D must supply a load of 750,000 BTUH.
Select 3/4 inch pipe for Section C to D.
d. Section D to E must supply a load of 500,000 BTUH.
Select 1/2 inch pipe.
a. Section A to B of pipe must supply the complete gas
load of 1,500,000 BTUH for the entire building.
Looking at the 5 PSIG sizing chart, the size of pipe
used in conveying gas would need to be sized at 1
inch diameter pipe. Note that even though furthest
distance from first stage regulator to appliance is 230
ft., we use the 250 ft. length.
e. Sections E to F must supply 250,000 BTUH. Select
1/2 inch pipe.
f. Sections B to C must supply 500,000 BTUH. Use 1/2
inch pipe.
b. Section B to C must supply the load of 1,000,000
BTUH. Select 3/4 inch pipe for Section B to C.
g. The final section, G to H, needs only 250,000 BTUH
for gas usage. This section would use 1/2 inch pipe.
Fig. 2
EXAMPLE
Perform pipe sizing for building.
Total heat load is 1,500,000 BTUH.
Quantity 6 - 250,000 BTUH heaters.
Building is 300 ft. long x 40 ft. wide.
Section
BTUH
Gas Load
1,500,000
1,000,000
750,000
500,000
250,000
500,000
250,000
A-B
B-C
C-D
D-E
E-F
B-G
G-H
LP Gas Pipe Size
@ 5 PSIG
1 in.
3/4 in.
3/4 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
First Stage Pipe Sizing
5 PSIG Inlet with a 1 PSIG Pressure Drop
Maximum capacity of pipe or tubing, in thousands of BTU/hr. of LP Gas
IMPORTANT: If exact length is not on chart, use next longer length. Select the size of pipe that shows at least as
much capacity as needed for each piping section.
Pipe Size
(In Inches)
1/2
3/4
1
1/2
3/4
1
Length of Pipe or Tubing
(In Feet)*
10
2946
6161
11605
125
751
1571
2956
20
2025
4234
7976
150
681
1424
2682
30
1626
3400
6405
175
626
1310
2467
40
1392
2910
5482
200
583
1218
2295
50
1233
2579
4859
225
547
1143
2153
60
1118
2337
4402
250
516
1080
2034
70
1028
2150
4050
275
490
1026
1932
80
957
2000
3768
300
468
978
1843
90
897
1877
3535
350
430
900
1696
100
848
1773
3339
400
400
837
1577
* Total length of piping from outlet of first stage regulator to inlet of second stage regulator (or to inlet of second
stage regulator furthest away).
August 1999
2.2-2
2
Installation
Instructions
Tank Sizing
pressure washers, water heaters, etc., that will be
drawing vapor from the tanks.
ATTENTION
■
The following is supplied for informational purposes
only.
■
Consult your LP gas supplier for specific requirements.
A tank is propane storage container ranging in size from 150
gallons to 10,000 gallons or larger. For agricultural heating
applications, the tank sizes typically used are either 500
gallons or 1,000 gallons with 1,000 gallons being the most
common. The size and quantity of tanks will vary and is
dependent on the total heating load at the site.
--- The heat input rating is located on the dataplate.
The coldest outside air temperature at night that the
tank(s) will be exposed to.
■
Percentage of propane remaining in the tank prior to
refill. Your fuel gas supplier will inform you at what
level a refill will normally occur.
IMPORTANT
In determining tank size and quantity, several factors apply:
■
■
■
Minimum vaporization of propane from liquid to vapor
occurs when temperatures are coldest and liquid level
of propane in the tank is lowest.
■
Size the quantity of tanks for the lowest temperature
you can expect in your area.
Total heat load of the building
--- To determine total load, add up the heat input
(expressed in BTUH) for all gas-fired heaters,
Refer to the following table to identify the heat output of
tanks at various temperatures and levels of fullness.
Tank Size
(Gallons)
Outside
Temps.
Percentage of Liquid Propane
Remaining Prior to Refill
500
º F.
0
-5
-10
-15
80%
532,800
399,600
266,400
132,200
70%
488,400
366,300
244,200
122,100
(Heat Input Expressed in BTUH)
60%
50%
40%
30%
444,000 400,000 355,000 311,000
333,000 300,000 262,500 233,250
222,000 200,000 177,500 155,500
111,000 100,000 88,750
77,750
20%
266,000
199,500
133,000
66,500
10%
200,000
150,000
100,000
50,000
1,000
0
-5
-10
-15
949,000
711,900
474,600
237,300
870,100
652,575
435,050
217,525
791,000
593,250
395,500
197,750
474,000
355,500
237,000
118,500
356,000
267,000
178,000
89,000
712,000
534,000
356,000
178,000
633,000
474,750
316,500
158,250
553,000
414,750
276,500
138,250
NOTE: For above table, multiply the results obtained by one of the following factors if nighttime temperatures will
not reach 0º F.:
Multiplier
1.25
1.50
1.75
2.00
Temperature
+5º F.
+10º F.
+15º F.
+20º F.
EXAMPLE
--- Select 1,000 gallon tank.
--- Total heat load is 1,500,000 BTUH (6-AB250
Heaters).
--- Coldest nighttime temperature is -10º F.
--- Tanks to be refilled by LP gas supplier when liquid
propane level is 30%.
A. In the 1,000 gallon tank sizing chart, locate -10º F.
outside temperature.
B. Locate the column which identifies 30% of propane
remaining in the tank prior to refill.
C. The intersection of these two variables identifies the
heat input. In this example, a 1,000 gallon tank can
supply 276,500 BTUH. (See shaded area in table.)
2.3-1
1
D. To determine the total number of tanks required:
Total Heat Load of Building
Heat Output of 1,000 Gallon Tank
or
NOTE:
1,500,000 BTUH/Building
276,500 BTUH/Tanks
= 5.4 Tanks
(6 Tanks)
Always round up fractions or decimals. See example.
(Example: 5.4 tanks = 6 tanks). This will give you some extra
capacity especially in cold weather, in the event your LP gas
supplier cannot refill your tanks immediately.
August 1999
Installation
Instructions
Tank Location and Installation
ATTENTION
■
The following is supplied for informational purposes
only.
■
Tank installation shall only be accomplished by a
qualified LP gas installation person.
■
State and local codes must be observed at all times.
■
In absence of state and local codes, follow
ANSI/NFPA58 Standard for Storage and Handling of
Liquefied Petroleum Gases.
Once the proper size of the LP gas supply tank(s) has been
determined, attention must now be given to the most
convenient, yet safe, location of the tanks on the customer’s
property.
Tanks should be placed in a location pleasing to the
customer that does not conflict with state or local
regulations or NFPA 58 (Storage and Handling of Liquefied
Petroleum Gases).
Generally, LP gas tanks should be placed in an accessible
location for filling, supported by concrete of appropriate size
and reinforcement, and located away from vehicular traffic.
Where the tank may be subjected to abrasive action or
physical damage due to vehicular traffic or other causes, it
must be placed not less than two feet below grade, or
otherwise protected against such physical damage.
Regardless of its size, attention must be paid to the tank
distance from building openings, external sources of ignition,
intakes to any outdoor mounted heaters, or mechanical
ventilation systems. Refer to NFPA58 and the following
illustration for the minimum distances that the LP gas tanks
must be placed from the building or other objects.
INLET / EXHAUST FANS
25' MIN
(SEE NOTE 2)
10' MIN
501-2,000
GALLON TANK
CAPACITY
VENTILATION FANS
125-500 GALLON
TANK CAPACITY
25' MIN
10' MIN
NEAREST LINE OF ADJOINING PROPERTY
WHICH MAY BE BUILT UPON
NOTE: 1. REGARDLESS OF SIZE, ALL TANKS FILLED ON SITE MUST BE LOCATED AT LEAST 10 FEET FROM
NEAREST SOURCE OF IGNITION (FANS, HEATERS, ETC.)
2. THIS DISTANCE MAY BE REDUCED TO NO LESS THAN 10' FOR A SINGLE CONTAINER OF 1200 GALLON
CAPACITY OR LESS, PROVIDED THAT THE CONTAINER IS AT LEAST 25' FROM ANY OTHER L.P. GAS
CONTAINER OF MORE THAN 125 GALLON CAPACITY.
3. DISTANCE FROM TANK TO BUILDING FOR TANKS OF 2,001-30,000 GALLON CAPACITY IS 50 FEET.
August 1999
2.4-1
1
Installation
Instructions
LP Gas Tank Manifolding
ATTENTION
■
The following is supplied for informational purposes
only.
■
Tank manifolding shall only be accomplished by a
qualified LP gas installation person.
■
Local and state codes must be observed at all times.
■
In absence of state and local codes, follow
ANSI/NFPA58 Standard for Storage and Handling of
Liquefied Petroleum Gases.
It has been a long-standing industry practice to manifold two
or more LP gas storage tanks together in order to increase
gas system vaporization capacity.
However, when tanks are manifolded together, never use a
first-stage regulator at each tank. If this is done, the total
required capacity for the installation may not be obtained. It
is almost impossible to set all regulators at the identical
pressure. Therefore, the regulator delivering the highest
outlet pressure will backpressure the other regulators, in
turn keeping them from operating. In effect, only one tank
would be supplying gas to the building. In this situation,
especially on large capacity installations, ignition failures
would occur due to poor gas volume and pressure.
To eliminate this problem, run high pressure piping from the
LP gas tanks into a common line, then install one first-stage
regulator that can handle the required capacity of the
installation. Refer to the following illustrations.
INCORRECT INSTALLATION
CORRECT INSTALLATION
1,000 GALLON
TANKS
1,000 GALLON
TANKS
FIRST STAGE
REGULATORS
(ONE FOR
EACH TANK)
FIRST STAGE REGULATOR
TO BUILDING'S
SECOND STAGE
REGULATOR(S)
2.5-1
1
TO BUILDING'S
SECOND STAGE
REGULATOR(S)
August 1999
Installation
Instructions
Manual Shut-Off Valve, Hose and Regulator Assembly
1. Always use approved pipe thread compound suitable
for use with L.P. gas or natural gas on the threaded
connections.
2. Assemble the components together according to the
figure. This view is to show general assembly of the
components only.
6. The heater’s gas regulator (with pressure relief valve)
should be installed outside of building. Any regulators
inside the buildings must be properly vented to the
outside. Local, state and national codes always apply
to regulator installation. Natural gas regulators with
vent limiting device may be mounted indoors without
venting to outdoors.
3. Tighten all connections securely.
7.
4. Check all connections for gas leaks using approved
gas leak detectors.
All gas pressure regulators must be installed in strict
accordance with the manufacturer’s safety
instructions. These instructions accompany each
regulator.
5. The heater must have the proper gas regulator
installed for the application. A regulator must be
connected to the gas supply so that gas pressure at
the inlet to the gas valve is regulated within the range
specified on the dataplate at all times. Contact the
L.B. White Co., Inc. if you have any questions.
8. Any heater connected to a piping system must have an
accessible, approved manual shut off valve installed
within six feet (6 ft.) of the appliance it serves. The
manual shut-off valve can be installed before the
regulator, under the eave of the building, or after the
regulator inside the building.
REGULATOR
GAS FLOW
REGULATOR VENT
NIPPLE
VALVE, MANUAL
SHUT-OFF
GAS HOSE
ADAPTER
TO CONTROL
SEDIMENT TRAP
VALVE INLET
August 1999
2.6-1
1
Installation
Instructions
Sediment Trap
Assemble the tee, nipples and cap together and tighten
securely. The sediment trap assembly must always be
mounted in a vertical position. Make sure pipe thread
compound that is resistant to both L.P. gas and natural gas
is used in making all connections. Check all connections for
gas leaks using approved gas leak detectors.
Make certain that a sediment trap is installed at the gas
valve inlet to prevent foreign materials (pipe compound, pipe
chips and scale) from entering the gas valve. Debris blown
into the gas valve may cause a malfunction resulting in a
serious gas leak that could result in a possible fire or
explosion causing loss of products, building or even life. A
properly installed sediment trap will keep foreign materials
from entering the gas valve and protect the safe functioning
of that important safety component.
Tee
5 in.
Nipple
Gas Control
Valve Inlet
2.7-1
1
3 in.
Nipple
Cap
August 1999
Installation
Instructions
Electrical Requirements
ATTENTION
■
The following is supplied for informational purposes
only.
■
All electrical wiring shall be accomplished by a
qualified electrician.
■
Local and state codes must be observed at all times.
■
In absence of local or state codes, follow
ANSI/NFPA70 National Electrical Code.
Strict attention must be given to the following areas before
connecting the heater to its electrical supply.
■
A properly installed three-wire electrical supply
consisting of separate hot, neutral, and ground leads
shall be connected to each electrical outlet that
supplies each heater.
■
Proper voltage must be supplied to each heater.
-- Proper voltage is 115 V.A.C.
+10% (127 volts maximum)
- 15% (98 volts minimum)
-- Under voltage may cause:
*
*
*
*
Low motor speed
High limit switch tripping
Burner flame cycling on/off
Control valve solenoid hums
or does not open.
-- Over voltage may cause:
*
■
August 1999
Motor thermal overload tripping
A three-wire cord set (consisting of hot, neutral and
ground leads) of proper wire gauge and desired
length, must be obtained through local sources when
connecting a remote mount thermostat to the heater.
2.8-1
1
Installation
Instructions
Remote Thermostat
Models 346/348, 377/379, 408/410
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Locate the two wires labeled “power supply to
thermostat” and “power return from the thermostat”
within the heater’s electrical junction box.
Black Lead
7. Connect the white lead of the thermostat cord to the
lead labeled “power return from thermostat”. Twist a
wire nut onto the exposed lead conductors until tight.
Pull the wire nut to make sure it is secure.
3. Remove the wire nuts from these two wires. Keep the
wire nuts.
White Lead
4. Remove the strain relief at the top of the junction box.
Strain
Relief
8. Attach the terminal on the end of ground wire to the
ground screw located within the junction box.
5. Run the thermostat cord through the strain relief along
with the other wires that feed into the junction box. You
will need a pliers to squeeze the strain relief and wire
bundle together to allow installation of the strain relief
back into the junction box.
Ground
Screw
6. Connect the black thermostat cord lead to the lead
labeled “power supply to thermostat”. Twist a wire nut
onto the exposed lead conductors until tight. Pull the
wire nut to make sure it is secure.
2.9-1
1
August 1999
Installation
Instructions
Remote Thermostat
Models 346/348, 377/379, 408/410 (Cont.)
9. Reconnect the heater to its electrical supply and open
the fuel supply valves to the inlet of the heater.
10. Light the pilot. Turn the thermostat up above room
temperature so the motor starts and main burner
ignites. Check the heater for proper operation.
11. Install the junction box cover plate. Tighten the plate
screws securely.
4. Remove the electrical knock-out hole located directly
above the bushing that the power cord is routed through.
Install a two-screw squeeze connector into this hole and
route the cord through the connector. Tighten the
connector screws after allowing sufficient lead length to
reach the terminal strip.
Knockout
12. Set the thermostat to desired temperature.
Model AS040
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Remove the motor access panel located on the back of
the case assembly.
5. Route the thermostat cord leads through the bushing
near the enclosure’s base.
Bushing
3. Remove the electrical enclosure cover.
6. Loosen the screws on the terminal strip that hold the
jumper in place. Remove the jumper.
(continued on following page)
Jumper
August 1999
2.9-2
2
Installation
Instructions
Remote Thermostat
Model AS040 (Cont.)
Model AB200 and AB250
7. Attach the ground lead terminal to the ground screw in
the enclosure.
1. Disconnect the heater from its electrical supply and
close all fuel gas valves to the inlet of the heater.
2. Open the burner access door to locate the heater’s
electrical enclosure. Remove the cover from the
enclosure.
Ground
Lead
8. Push the exposed conductors of the power supply and
return leads beneath the terminal strip screw plates
previously occupied by the jumper. Tighten the screw
plates and tug on the leads to make sure the leads are
securely attached.
3. Remove the hole plug from the thermostat cord entry
hole near the power cord at the front of the case
assembly.
4. Run the thermostat cord through this hole and through
the bushing in the base of the enclosure.
9. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
10. Check the heater for proper operation. Light the pilot
and set the thermostat so the fan motor starts and the
main burner ignites.
11. Disconnect the heater from its electrical supply.
Reinstall the electrical enclosure cover and the fan
access panel. Reconnect the heater to its electrical
supply. Set the thermostat to desired temperature.
2.9-3
3
August 1999
Installation
Instructions
Remote Thermostat
Model AB200 and AB250
5. Secure the cord in place at the entry hole on the case
front with the strain relief provided in the thermostat kit.
6. Loosen the terminal strip screws that hold the jumper in
place. Remove the jumper.
7. Push the exposed conductors of the power supply and
power return leads beneath the terminal strip screw
plates previously occupied by the jumper. Tighten the
screw plates and tug on the leads to make sure the
leads are securely attached.
8. Attach the ground lead terminal to the ground screw in
the enclosure.
9. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
10. Light the pilot. Set the thermostat so the fan motor
starts and the burner lights. Check the heater for proper
operation.
11. Set the thermostat to the desired temperature.
Reinstall the electrical enclosure cover.
August 1999
2.9-4
4
Installation
Instructions
Hanging Instructions
1. Assemble according to the illustration and tighten all
eyebolts securely.
2. Make sure the heater is properly positioned before
use and is hung level. Observe and obey all minimum
safe distances of the heater to the nearest
combustible materials. Minimum safe distances are
given on the heater dataplate.
3. See figure for typical indoor installation. In any animal
confinement building, consideration must be given to
making sure the heater is located away from the
livestock so that livestock cannot knock the heater,
tear it loose from its mounting, or damage the heater,
its power supply cord, or its gas supply line in any way.
Make sure you observe and obey minimum clearance
distances to combustible materials as stated in the
specification section of this owner’s manual and on
the heater itself.
Cage Nut
CHA
IN O
R CA
BLE
OPTIONAL INDOOR
REGULATOR
MOUNTING LOCATION
BLACK PIPE
THROUGH WALL
GAS HOSE
THERMOSTAT
CORD
WALL
VENT LINE
HEATER
YOKE
THERMOSTAT
2.10-1
1
WALL OUTLET
POWER CORD
30.5CM
12 IN.
See
Spec.
30.5CM
Tables
SEDIMENT
TRAP
August 1999
Installation
Instructions
Air Diverters
Depending on model number, two designs of air diverters
may be available for your heater. The air diverters allow the
hot discharge air to be blown out either in two 45 degree
paths or in one direction only (two-piece diverter kit only).
Either way promotes good air movement and circulation.
Two-P
Piece Air Diverter
1. Install the air diverter as follows. This is a typical
procedure for all heaters. Appearance of the outlet on
heater may vary from model to model.
a. The air diverter’s notched tabs on each half will
pop into the blower outlet between the inside of
the case assembly and the blower housing outlet.
If the notched tabs do not pop into the blower
outlet, loosen (do not remove) the blower outlet
screws. Doing this provides a gap into which you
can insert the tabs.
b. The air diverter halves are installed so the notches
in the tabs are up against the formed guard of the
blower outlet.
c. Tighten blower outlet screws.
Diverters Pointed Both Left and Right
August 1999
Diverters Pointed in One Direction
2.11-1
1
Installation
Instructions
Air Diverters
One-P
Piece Air Diverter
1. Loosen the four blower outlet screws.
2. Align the keyhole slots in the mounting flanges with
each outlet screw.
Keyhole Slots
2.11-2
2
3. Push down on the diverter to lock it into position.
Tighten the outlet screws.
ATTENTION
Larger design air diverters for Models 377/379, 408/410,
and AB200 heaters incorporate holes in the “Y” of the
assembly to allow ease of mounting to the heater outlet.
August 1999
Operation
Instructions
Start-Up and Shut-Down Instructions
Start-U
Up Instructions
Determine the pilot control valve type supplied on the heater.
For heater with gas control valves with an internal low
pressure regulator and gas shut off, refer to Section A.
For heaters with gas control valves without an internal low
pressure regulator and gas shut-off, refer to Section B.
Follow all procedures within the appropriate section on initial
start-up after heater installation by qualified gas heater
service person. For normal start-up simply turn the
thermostat above room temperature. The heater will start.
8.
Connect the heater’s power cord to an approved
electrical supply.
9.
Set the thermostat above room temperature. The
heater will light.
10.
Reset the thermostat to desired room temperature.
SECTION B
Control Valves without Internal
Low Pressure Regulator and
Gas Shut-O
Off (Part 500-0
02309)
ATTENTION
■
On new installations it may take about a minute for
the gas to purge out any air in the pilot line before the
pilot stays lit.
SECTION A
Pilot
Button
Control Valves with Internal
Low Pressure Regulator and Gas
Shut-O
Off
Knob
Pilot
Button
1.
Open all manual fuel supply valves and check for gas
leaks using approved leak detectors.
2.
Remove the metal cover from the control enclosure (if
applicable).
3.
Position the indicator arrow on the control valve’s
shut-off knob to “pilot”.
4.
Fully depress the pilot button while applying flame to
the pilot burner.
5.
Keep the button depressed for about 30 seconds to
allow the thermocouple to warm up so the pilot stays
lit after the pilot button is released.
6.
Position the knob to “on”.
7.
Reinstall the metal cover (if applicable).
August 1999
1.
Open all manual fuel supply valves to the heater and
check for gas leaks using approved leak detectors.
2.
Fully depress the pilot button while applying flame to
the pilot burner.
3.
Keep the button depressed for about 30 seconds to
allow the thermocouple to warm so the pilot stays lit
after the pilot button is released.
ATTENTION
■
The red cap protecting the pilot control may become
stiff in colder temperatures.
■
Remove the cap and fully depress the pilot button to
light the pilot. Reinstall the cap.
4. Connect the heater’s power cord to an approved
electrical supply.
5.
Set the thermostat above room temperature. The
heater will light.
6.
Reset the thermostat to desired room temperature.
3.1-1
1
Operation
Instructions
Start-Up and Shut-Down Instructions
Shut-D
Down Instructions
If the heater is to be shut down for cleaning, maintenance, or
repair, follow steps 1 through 5. Otherwise, simply turn the
thermostat to “Off” or “No Heat” for standard shut down.
1.
Close all manual fuel supply valves.
2.
With heater lit, allow heater to burn off remaining fuel
in gas supply hose.
3.1-2
2
3.
If applicable, turn the control valve knob to “Off”.
4.
Turn thermostat to “Off” or “No Heat” position.
5.
Disconnect the heater from its electrical supply.
August 1999
Operation
Instructions
Variable Heat Output
1. Some models of propane (LP) gas or natural gas
heaters have a throttle valve for varying heat output
located between the gas control valve and gas
manifold assemblies. THIS IS NOT A MANUAL GAS
SHUT OFF VALVE.
2. The throttle valve can be adjusted to deliver either
minimum heat or maximum heat.
Become
familiarized with the design of the throttle valve in your
heater. Refer to the illustrations below to determine
valve location and how to adjust the heat output.
MAXIMUM HEAT
Handle
Parallel
90%
75
OF
MA
XIM
%
UM
OF
MINIMUM HEAT
Handle
Turned 90º
UM
XIM
MA
D
OL
IF
AN
M
DE C RE
AS
E
I
N
C
R
E
AS
E
August 1999
3.2-1
1
Preventative
Maintenance
Periodic Inspection
1. The area surrounding the heater shall be kept clear
and free from combustible materials, gasoline, and
other flammable vapors and liquids.
regulators installed and check delivery pressures to
the appliance to make sure that the regulator is
reliable.
2. Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines. Also, at this time
have your gas supplier clean out the sediment trap of
any debris that may have accumulated.
5. Check all wiring associated terminals and electrical
components within the heater for corrosion, frayed or
cut insulation, tight connections, etc. Repair or
replace as necessary.
3. Regulators must be periodically inspected to make
sure the regulator vents are not blocked. Debris,
insects, insect nests, snow, or ice on a regulator can
block vents and cause excess pressure at the
appliance.
6. Review all heater markings (i.e. wiring diagrams,
warnings, start-up, shut-down, troubleshooting, etc.)
at the time of maintenance for legibility. Make sure
none are cut, torn, or otherwise damaged. Any
damaged markings must be replaced immediately by
contacting the L.B. White Co., Inc. Dataplates, startup and shut-down instructions and warnings are
available at no cost. A nominal charge will be applied
for wiring diagrams, and troubleshooting markings.
4. Regulators can wear out and function improperly.
Have your gas supplier check the date codes on all
August 1999
4.1-1
1
Preventative
Maintenance
Cleaning Instructions
WARNING
Fire, Burn, and Explosion Hazard
■ This heater contains electrical and mechanical components in the gas management, safety and airflow systems.
■ Such components may become inoperative or fail due to dust, dirt, wear, aging, or the corrosive atmosphere of an
animal confinement building.
■ Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property
damage.
1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.
2. The heater should have dirt or dust removed
periodically:
a. After each flock or between building re-population,
give the heater a general cleaning using
compressed air or a soft brush on its interior and
exterior. At this time, dust off the motor case to
prevent the motor from over-heating and shutting
the heater down.
4.2-1
1
b. At least once a year, give the heater a thorough
cleaning. At this time, remove the fan and motor
assembly and brush or blow off the fan wheel,
giving attention to the individual fan blades.
Additionally, make sure the burner air inlet venturi
ports and the throat of the casting are free of dust
accumulation and the area between the heat
chamber top and inside case is also free of dust.
c. Observe and obey all instructional warnings
pertaining to cleaning procedures located on each
heater.
August 1999
Troubleshooting
Instructions
Troubleshooting Guide
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
WARNING
Electrical Shock and Burn Hazard
■ Do not attempt to service or repair this heater unless
you are a properly trained and qualified gas heater
service person.
To effectively use these flow charts, you must first identify
the problem. The problems are numbered sequentially,
along with a brief explanation of each problem. Start at the
“diamond” closest to the identified problem and proceed
with each step, performing the suggested tests. After each
step or test, the guide will direct the service person to the
next logical step based on the outcome of the previous
check.
■ Troubleshooting this system may require operating the
The problems are listed below along with the page number
on which you may find the flow chart for the specific
problem.
■ Failure to follow this warning may result in property
Description
Problem
1 Pilot will not light
unit with line voltage present and gas on. Use extreme
caution when working on the heater.
damage, personal injury or death.
The troubleshooting flow charts in this section provide
systematic procedures for isolating heater problems. Refer
to the Component Testing section of this Service Guide for
general instructions on performing voltage and continuity
checks as well as evaluation of specific components as
indicated by these charts. Refer to the appropriate wiring
diagram for assistance in performing voltage and continuity
checks. Refer to the Service section for gas pressure checks
and adjustments as indicated by the flow charts.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital Multimeter - for measuring voltage and resistance.
• Thermocouple Test Kit - (L. B. White Part No. 500-08506)
When used with a standard digital multimeter, this kit
allows testing of the power unit of the pilot safety control
and thermocouple on pilot ignition systems.
• Low Pressure Gauge - (L.B. White Part No. 550-00764) for
checking inlet and manifold pressures of the gas control
valve against dataplate rating.
INITIAL PREPARATION
■ Visually inspect heater for apparent damage.
■ Check all hoses for abrasion and wear. Replace any
that are suspect.
■ Make sure heater is properly installed and meets
minimum clearances to nearest combustible materials.
(Refer to dataplate on heater.)
■ Check all wiring for loose connections and worn
insulation.
August 1999
Page
5.1-3
2 Pilot will not stay lit when pilot control
button is released
5.1-4
3 Motor runs. Burner does not light with
pilot light lit.
5.1-5
4 Motor does not run, heater does not light
with pilot light lit.
5.1-6
5 Main burner cycles on and off repetitively.
Pilot stays lit.
5.1-7
6 Pilot will not stay lit when main burner
and blower are operating.
5.1-7
7 High limit switch is open.
5.1-8
8 Burner does not shut off.
5.1-9
9 Flame “lifting” off of burner.
5.1-9
10 Burner flame drops out after 10 - 15
minutes of operation.
5.1-9
11 Gas control valve “chatters”.
5.1-10
12 Motor “hums”.
5.1-10
13 Heater is not delivering proper air flow
5.1-11
14 Heater is not delivering proper heat output
5.1-11
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart. Refer to the Servicing sections as necessary to obtain
information on disassembly and replacement procedures of
the component once the problem is identified by the flow
chart.
Additionally, a series of illustrations has been provided on
the following page to identify typical problems based upon
pilot flame appearances.
5.1-1
1
Troubleshooting
Instructions
Troubleshooting Pilot Flame
ATTENTION
■ These illustrations are intended to provide a means to
assist you in troubleshooting a pilot problem. They
must be used in conjunction with proper cleaning,
checking for proper gas pressures, etc.
1. Correct Flame
■ With any pilot light assembly, always make sure the
thermocouple is completely installed within the pilot
bracket by either its mounting clip or nut.
4. Wavy Blue Flame
Check for:
* Excessive drafts
* Pilot shield
loose
3/8 in. to 1/2 in.
Pilot flame
spreader
head
Thermocouple
2. Noisy, Lifting Flame
5. Hard, Sharp Flame
Check for:
* High gas pressure
* Improper orifice
* Partially plugged
pilot orifice or dirty
pilot assembly
3. Lazy, Yellow Flame
6. Small, Blue Flame
Check for:
* Partially plugged
pilot orifice or pilot
tubing
* Low gas pressure
* Dirty pilot assembly
5.1-2
2
Check for:
* High gas pressure
* Improper pilot
orifice
Check for:
* Improper pilot orifice
* Low gas pressure
* Partially plugged pilot
orifice or
pilot tubing
August 1999
August 1999
5.1-3
3
Pilot will
not light.
Problem 1
Fill container if low.
No
Is
LP gas cylinder
or tank full?
Yes
Open all supply valves.
No
Are all fuel
supply valves
open?
Yes
Fully depress the
pilot button.
No
Is the
pilot control
button fully
depressed?
No
Yes
Is
there a
restriction in gas Yes
supply hose, pilot
tube or pilot
orifice?
Replace pilot
No
Is the
correct pilot
orifice installed
for the fuel being
used?
Remove these
components and
blow out with
compressed air.
Yes
Yes
Check for proper fuel
pressure to inlet of
heater. Adjust as
No
Is there air in
the gas line?
Depress pilot
button to bleed
off the air until
pilot lights.
(Normally 30 45 seconds.)
5.1-4
4
August 1999
Pilot will
not stay lit
when pilot
control
button is
released.
Problem 2
No
No
Yes
Check for proper
pressure to heater
inlet. Refer to
heater nameplate.
No
Replace with proper
pilot orifice.
No
Is proper pilot
orifice installed?
No
Yes
Check millivolt output. 10
MV or greater is acceptable.
Replace thermocouple if
less than 10 MV (with
burner off).
Yes
Yes
No
Has drop
out of safety magnet
on pilot control been
checked?
Pilot flame should
impinge on 3/8 - 1/2 in.
of thermocouple tip.
No
Is
thermocouple
properly positioned Yes
in pilot
bracket?
No
Is
pilot assembly,
including orifice,
clean?
Disassemble and
clean with
compressed air. Do
not use pointed
instruments. Replace
pilot orifice if
Check millivolt dropout. 4 MV or less
is proper. Over 4 MV is weak valve.
Replace entire valve.
Check for debris
between contact of
thermocouple and
electromagnet of valve.
No
Did you
check for dirt or
debris between
thermocouple contact
and electromagnet
of valve?
Has
thermocouple
strength been
checked with
tester?
Yes
Snug nut in place. (Do
not overtighten.)
No
Is
thermocouple
contact nut
tight?
Remove and clean
with compressed air.
Allow 30 - 60 seconds
warm up before releasing
pilot button.
Are
pilot line
or gas supply
hose partially
plugged?
Yes
Did
you allow
sufficient time to Yes
allow thermocouple
warm up?
Is
proper gas
Yes
pressure supplied
to heater?
Fill container if low.
No
Is LP
gas supply
cylinder tank
full?
Yes
August 1999
5.1-5
5
Yes
No
Is proper voltage
supplied to and
from high limit
switch to control
valve?
No
Are
burner
orifice, burner
Yes
casting or manifold
plugged?
No
Is high limit
switch
tripped?
Yes
Yes
Check for proper pressure
using low pressure gas gauge.
Refer to heater nameplate.
No
Yes
Replace air proving switch
or for units with centrifugal
switch, replace motor.
No
Are air proving
switch or centrifugal
switch contacts opening
and closing properly?
(Perform a continuity
check.)
Have
you checked
for proper inlet and
burner manifold pressure
at gas control valve?
Clean out debris.
Reset switch.
Determine cause of
high limit tripping.
(See Problem 7.)
Check voltage supply,
electrical connections to
switch and wires for
continuity. Repair as
necessary.
No
For units with air proving
switch or centrifugal switch,
is proper voltage being
delivered to the
switch?
Check electrical connections
to high limit switch and to control valve
and check wires for continuity.
Motor runs.
Burner
does not
light with
pilot light
lit.
Problem 3
Yes
Yes
Adjust flapper arm to
engage switch arm or clean
out any debris from around
flapper or air flow switch.
No
Is
flapper arm
(if applicable)
engaging switch
arm properly?
No
Is flapper
(if applicable)
binding?
If proper gas pressure is supplied to the
inlet of the gas control valve, but burner
manifold pressure is not apparent, then
replace the control valve.
Yes
Tighten set screws
to motor shaft.
No
Is
fan tightened
properly to motor
shaft?
Repair or replace flapper.
Yes
5.1-6
6
Motor does
not run,
heater
does not
light with
pilot light
lit.
Problem 4
August 1999
Yes
Provide proper voltage.
See heater nameplate.
Check circuit breaker
in electrical system.
No
Is
proper voltage
supplied to
heater power
cord?
Yes
Set thermostat above
room temperature.
No
Is
thermostat set
above room
temperature?
Yes
Check electrical
connections to thermostat
and power cord.
No
Is
proper voltage
supplied to
thermostat?
Yes
Defective thermostat.
Replace.
No
Do
thermostat
contacts “open and
close”? (Perform
continuity
check.)
Repair or replace
wires and
connections.
No
Are
electrical
connections to
motor installed
properly?
No
Is
proper voltage
supplied to
motor?
Yes
Repair,
condition or
replace fan
wheel.
Defective motor.
Replace.
No
Is fan
wheel binding?
Yes
August 1999
5.1-7
7
Pilot light
will not
stay lit
when main
burner and
blower are
operating.
Problem 6
Main burner
cycles on
and off
repetitively.
Pilot stays
lit.
Problem 5
Yes
Check for proper
pressure. Make sure
proper fuel is being used
for appliance installed.
No
Have you checked for
proper fuel use and inlet
gas pressure?
Remove blockages.
No
Is
outlet of heater
free from
blockages?
Yes
Air proving
switch arm is
out of
adjustment.
Tighten pilot shield
screws to close gap
between shield and
orifice. Make sure gasket
(if applicable) is
positioned properly.
No
Is pilot shield (and
gasket, if applicable) in
proper position and tight
against burner?
Readjust flapper arm.
Bend arm up slightly with
needle nose pliers.
5.1-8
8
August 1999
High limit
switch is
open.
Problem 7
Give heater a
thorough cleaning
with a soft brush or
compressed air.
DO NOT USE WATER
OR ANY LIQUID
CLEANING AGENTS.
No
Is heater
reasonably
clean?
No
Is fan loose
or dirty?
Yes
Yes
Yes
No
Have you checked for
proper gas type being
used, pressure or for
liquid propane in line?
No
On heaters without
air proving switch, is
motor overheating
and shutting down?
Remove restriction.
Yes
Check for proper fuel and pressure on
nameplate of heater. Correct as necessary.
Yes
Check building electrical
system. Repair as
necessary. See heater
nameplate for correct
voltage.
No
Is
proper voltage
being supplied
to motor?
No
Are
there restrictions
at air inlet or
outlets (such as
unapproved
ductwork)?
Tighten fan wheel set
screw(s) to motor
shaft. Blow fan with
compressed air or
clean with soft brush.
Motor is defective.
Replace.
No
Is motor dirty?
Yes
Clean motor housing.
August 1999
5.1-9
9
Burner
flame drops
out after
10 - 15
minutes of
Problem 10
Flame
“lifting”
off of
burner.
Problem 9
Burner does
not shut
off when
temperature
requirement
is satisfied.
Problem 8
Yes
Yes
Yes
Resize line and reselect
larger tank size if necessary.
No
Is
gas supply
line and tank
properly
sized?
Check for proper pressure
to inlet of heater and also
for proper burner manifold
pressure.
No
Has gas
pressure been
checked?
Replace thermostat.
No
Does
thermostat shut
off within ± 3° F.
of set point?
See problem 3 and 6.
Are there blockages in
burner casting, burner orifice or
primary air inlets of casting?
Debris is lodged
in seat of gas
control valve.
Replace entire
valve.
Yes
Clean with compressed air.
5.1-1
10
August 1999
Motor
“hums”.
Problem 12
Gas
control
valve
“chatters”.
Problem 11
Yes
Defective motor or
capacitor. Replace.
No
Are
wires
disconnected
between motor
and capacitor?
Check for proper voltage.
See heater nameplate.
Have qualified electrician
correct if necessary.
No
Is
proper voltage
to gas control
valve being
supplied?
Yes
Yes
Defective gas control
valve solenoid.
Replace entire valve.
Reconnect wires.
Test for proper
operation.
Check for proper inlet and
burner manifold pressure.
No
Has proper gas
pressure been
verified?
August 1999
5.1-1
11
Yes
Is the gas control valve
receiving proper inlet
pressure and delivering
proper outlet pressure?
Is heater receiving proper
voltage from power supply?
(check heater dataplate.)
No
Is blower outlet
blocked?
Yes
Yes
Is burner
orifice or casting
plugged with dust
or debris?
Yes
Clean with soft brush, dry
cloth or compressed air.
Defective motor or capacitor. Replace motor.
Remove blockage(s).
Clean heater as necessary.
(2) With any electrical problem, all wiring should be checked for good connections and proper voltage and repaired if a problem is found.
(1) Some thermocouples use a retainer clip to secure the thermocouple into the pilot bracket. Make sure the thermocouple is pushed up completely into the
hole so clip on thermocouple holds it securely within the bracket. Other thermocouples use a retainer nut to hold the thermocouple in place. Make sure the
nut is securely tightened.
Heater
is not
delivering
proper heat
output.
Problem 14
Heater is
not
delivering
proper air
flow.
Problem 13
Voltage Checks
Procedure
Checking for voltage supply to high limit switch.
Testing for voltage at any of the components is a relatively
easy procedure. The following illustrates how to check
voltage at some of the components used in the heater.
Apply the probe to the power input side of the limit switch
and the other to ground. Voltage will appear after the air
proving switch makes.
Warning
Electrical Shock Hazard
■ Troubleshooting may require the heater to be
connected to its electrical supply.
■ Do not directly touch exposed terminal
connections when checking voltage. Use only the
insulated probes of the voltage tester.
■ Failure to follow this warning may result in
electrical shock leading to personal injury.
First, set the function selector switch of the tester to “AC”
(alternating current). Check for voltage at either the ignition
module or the individual component. To test, place one of
your tester probes at the “hot” power supply terminal of the
component being tested and the other probe to a grounded
portion of the heater’s cabinet. (Normally, a sheet metal
screw on the cabinet will serve this purpose.) Or, place your
probes across the terminals of component being tested. The
following are some examples showing both procedures:
Checking for voltage supply to motor.
Apply a tester probe to the end of the black motor wire and
the other probe to ground. When the thermostat calls for
heat, you will see approximately 120 volts readout on the
meter display. This verifies the thermostat is supplying
voltage and the wiring between the thermostat and the
motor is in good condition.
Checking for voltage supply to gas control valve
from the high-llimit switch.
Apply one probe to female terminal at end of gas control
valve wire and the other to ground. You will see voltage
appear, proving the air proving switch, high-limit switch, and
respective wires are in order.
Motor
Wire
August 1999
6.1-1
1
Component
Testing
Continuity Checks
Continuity Checks
High Limit Switch
Equipment required:
Digital Volt/Ohm Meter
Explanation:
In a continuity test, you simply want to determine whether or
not an electrical pathway exists through a component. For
these tests, it is important that the probes of the multimeter
make good contact with the part being tested. They should
touch bare metal or wire, not insulation, paint, or dirt.
Alligator clips make firmer contact than needle probes, use
them where possible.
Also, manipulate wires to see if they are loose to help
uncover loose connections.
The components which exhibit good continuity within the
electrical circuit also provide a resistance to the flow of
electricity. The resistance is measured in ohms and will be
displayed on the meter. You do not need to remove the
components to check for continuity. The following illustrates
how to check for continuity for some of the components used
in the heater.
Typically, components which show an open circuit and are
not in proper working order will exhibit an “overload” readout
on the display of the multimeter. These components should
be replaced. However, some components such as an air
proving switch have a set of normally open contacts. To
verify proper operation, the switch arm needs to be pushed
upward or the flapper lifted so the contacts are engaged. At
this point an ohm reading should appear.
Air-P
Proving Switch
Attention
Make sure that the heater is disconnected from its electrical
source before conducting this procedure. Failure to do so
will result in damage to your meter.
Procedure
First, set your meter to the continuity scale (if provided) or
the ohm(s) scale. Place the tester probes on the terminals
of the component being tested. If your meter has an audible
continuity feature you will hear a “ringing” sound in addition
to seeing a read out in ohms. Examples of checking for
continuity on several components are shown.
6.2-1
1
To check for proper thermostat operation, connect the
testing probe to the thermostat terminals as shown. When
the thermostat contacts are open, the meter will show an
open circuit. When the thermostat is adjusted to call for
heat, the contacts should close and you will see an ohm
readout appear on the tester indicating that there is a
completely closed electrical circuit through the thermostat.
August 1999
Component
Testing
Continuity Checks
Thermostat
Attention
■ Many thermostats can be wired to open or close on an
increase in temperature.
■ Make sure the thermostat is wired properly so the
contacts close when the thermostat is set to a point
above room temperature and open when the
temperature is achieved. This will allow the heater to
cycle accordingly.
■ Refer to the heater wiring diagram or the wiring diagram
applied to the inside of the thermostat cover for proper
connection.
August 1999
6.2-2
2
Component
Testing
Thermocouple and Power Unit Tests
PILOT
BURNER
Equipment Required:
THERMOCOUPLE
Volt / Ohm Meter with DC Scale
Thermocouple Test Kit, Part Number 500-08506
The thermocouple is used in conjunction with the pilot safety
control valve in supplying pilot gas to the pilot orifice.
THERMOCOUPLE
LEAD
Here is How it Works:
A thermocouple converts heat energy into electrical energy.
When the tip of the thermocouple is properly positioned in
the pilot flame, the temperature difference between the hot
and cold junction generates a small amount of electrical
energy in the form of direct current (DC) which is fed into the
spring-loaded power unit within the control valve. The
current holds the power unit open to allow gas to be fed to
the pilot orifice.
COLD
JUNCTION
MOUNTING
CLIP
OPTIONAL
ATTACHMENT
NUT
HOT JUNCTION
THERMOCOUPLE
CONNECTOR NUT
POWER UNIT
CONNECTOR
CONTACT
CURRENT CONDUCTORS
INSULATED WIRE
COPPER TUBING
POWER
UNIT
COIL
SAFETY VALVE
PLUNGER
If the pilot flame is extinguished, or is too small to reliably
heat the thermocouple, the DC output being generated
drops below the minimum level required to hold the power
unit open. The spring within the power unit pushes down the
safety valve plunger, thereby discontinuing the flow of gas to
the pilot and main burner.
If pilot outage problems are occurring, there are several
steps that you must complete before assuming the
thermocouple, or the pilot safety control valve are defective.
These are as follows:
■ Check inlet pressures to the control valve to make sure
the pressure is within parameters specified on the
heater’s dataplate.
■ Clean the pilot assembly components, or if necessary,
replace the pilot orifice if it is plugged.
■ Insure that dirt is not located between the
As long as the pilot gas stays lit and the pilot flame is
directed to the thermocouple, the thermocouple will
continue to create the small amount of electrical energy
necessary to keep the power unit open. The following
illustration shows the electrical circuit of the thermocouple
with its relationship to the pilot safety control valve.
thermocouple’s power unit contact and power unit
within the safety control valve.
■ Insure that the thermocouple is properly positioned
within the pilot burner bracket, that the pilot flame
envelopes the thermocouple’s tip and the
thermocouple’s contact is snugged at the gas control
valve. (Tighten finger tight plus 1/4 turn.)
■ The pilot shield must be tight against the burner
casting.
■ The pilot gasket (if applicable) is properly installed
between pilot shield and casting.
■ If these items are satisfactory, then proceed to check
both the DC output strength of the thermocouple and
drop-out strength of the electromagnet within the
power unit of the pilot safety control valve.
6.3-1
1
August 1999
Component
Testing
Thermocouple and Power Unit Tests
Testing Procedures:
C. THERMOCOUPLE CHECK
(Applies to all thermocouples and gas control valves.)
A. INITIAL PREPARATION
1. Disconnect the heater from its electrical supply.
1. Light the pilot.
2. Set your voltage tester to the DC scale, and if the tester
is so equipped, set the scale to MV (millivolts). Connect
the probes of multimeter to the millivolt tester.
2. Close the fuel supply valves to the inlet of the heater.
B. TEST KIT INSTALLATION
1. Remove the thermocouple contact from the control
valve.
Thermocouple
Contact
2. Thread the contact nut of the tester into the control
valve and tighten finger tight plus 1/4 turn.
3. Observe the DC voltage reading. The reading should
rise to at least 10 millivolts DC before leveling off. If the
reading never reaches 10 millivolts, discontinue the
test at this point and replace the thermocouple. Start
the test over. If the reading is 10 millivolts or greater,
and the pilot stays lit, discontinue the test and remove
the test kit. Reinstall the thermocouple.
4. Reconnect the heater to its electrical supply.
D. POWER UNIT CHECK
Tester
1. Close the fuel supply valve to the heater and allow the
pilot flame to be extinguished.
2. Monitor your meter reading. The millivolt reading will
drop slowly as the thermocouple cools.
3. Thread the heater’s thermocouple into the tester and
tighten finger tight plus 1/4 turn.
Heater Thermocouple
to Tester
4. Open the fuel supply valves to the heater.
August 1999
3. Listen for the “snap” as the power unit within the
control valve drops out (releases) normally within 30 60 seconds after pilot flame is extinguished.
4. If the millivolt reading is 4 millivolts DC or greater when
the valve drops out, the power unit within the control
valve is weak. The control valve must be replaced in its
entirety.
6.3-2
2
Component
Testing
High Limit Switch Tests
Method of Test:
Disconnect the heater from its electrical supply before
conducting this test.
Remove the switch from its location. Hold the switch by one
of its legs with a pliers and apply a small flame only to the
sensing portion on the back side of the switch. Be careful
not to melt the plastic housing of the switch when
conducting this test. Within 1 minute, you should hear a
“pop” coming from the switch which indicates the electrical
contacts have opened.
Let the switch cool down for about 10 - 20 seconds before
firmly pressing the reset button on the switch. Check for
continuity across the terminals of the switch to make sure
the contacts are closed.
Reinstall the switch into the heater and reconnect heater to
its electrical supply.
ATTENTION
Model AB200 heaters incorporate a high limit switch with a
sensing capillary. To test this switch, run a small flame back
and forth along a 6 inch section of the capillary. Within 1
minute the electrical contacts of the switch should open.
You may leave the switch in mounted position to perform the
test.
6.4-1
1
August 1999
Wiring
Diagrams
Electrical Connection and Ladder Diagram
The wiring diagram on the following page is provided to give
the qualified service person information on the
interconnection and sequence of operation of the electrical
components of various models of L.B. White pilot ignition
heaters.
The wiring diagram is generic in its design and is suitable for
all models and designs of L.B. White pilot ignition heaters. Its
purpose is to show the flow of electricity through electrical
components, whether or not the particular model which is
being serviced utilizes a terminal block, terminal strip, or wire
nuts in making the connections.
August 1999
CAUTION
Refer to the heater’s electrical connection diagram when
servicing to avoid wiring errors and heater malfunction.
Check for proper operation after servicing.
The part number of the wiring diagram is 150-20994.
ATTENTION
If any of the original wire as supplied with the heater must be
replaced, it must be replaced with wiring material having a
temperature rating of at least 302° F. (150° C.)
7.1-1
1
Electrical Connection
and Ladder Diagram
Wiring Diagrams
Used on:
Design Sequence
All
Model
All
WARNING: THIS HEATER MAY START AT ANY TIME
AIR PROVING SWITCH
(NOT SUPPLIED ON SOME MODELS)
BLACK
OR RED
BLACK
BLACK OR RED
BLACK
BLACK
GAS
CONTROL WHITE
VALVE
HIGH LIMIT
SWITCH
BLACK
BLACK
THERMOSTAT
(OPTIONAL)
JUMPER
(REMOVE TO ADD
THERMOSTAT)
BLACK
MOTOR
WHITE
BLACK
WHITE POWER
GREEN CORD
GROUND
NOTE: IF AIR PROVING SWITCH IS NOT SUPPLIED, POWER IS SENT
DIRECTLY TO HIGH LIMIT SWITCH. SEE "DASHED" LINE.
ELECTRICAL CONNECTION DIAGRAM
NEUTRAL
GROUND
THERMOSTAT
MOTOR
AIR PROVING SWITCH
HIGH LIMIT
SWITCH
SOLENOID
ELECTRICAL LADDER DIAGRAM
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A
TEMPERATURE RATING OF AT LEAST 302O F (150O C).
7.1-2
2
August 1999
Servicing
Instructions
Component Identification and Function
All components must work together for proper heater
operation.
However, as with anything electrical or
mechanical, problems may arise which will require you to
determine what malfunction has occurred. Before you start
troubleshooting, it’s a good idea to understand the
components in their appearance and purpose.
Main Operational Components
A. Air Proving
Flapper
A stainless steel flapper (sail) located
in the blower outlet that upon an
increase in air pressure generated by
the fan and motor, lifts and pivots
upward and engages the air proving
switch arm, thereby closing the switch
contacts, establishing that the motor is
up to full speed and sufficient airflow is
present.
B. Air Proving
Switch
Safety device that proves that proper
motor speed and airflow is being
achieved before the gas control valve is
opened.
C. Burner
A device designed for the burning of
gas or a gas/air mixture in the
combustion zone.
D. Burner Orifice
Metering device which is drilled to a
specific diameter to allow a volume of
gas to be fed through the burner at the
stated manifold pressure (see
dataplate) to achieve proper heat
output.
August 1999
8.1-1
1
Servicing
Instructions
Component Identification and Function
E. Fan Housing
An assembly composed of the motor,
fan wheel and housing for purposes
of pulling air through the heater and
discharging heated air into the room.
F. Fan
May be of blade or wheel designs
depending on heater model. Used in
conjunction with the motor and fan
housing to pull hot air from the
heater and blow it into the room for
heating purposes.
G. Gas Hose
Flexible connector used to convey
gas from gas supply line on building
to
heater.
H. Heat Chamber
8.1-2
2
Metal “fire box” which is used to
support the burner and fan
assemblies while at the same time
providing
an
area
where
combustion of gas occurs.
August 1999
Servicing
Instructions
Component Identification and Function
I. High Limit Switch
A manually resetable temperature
activated switch. Its purpose is as
a safety device wired into the
control system to sense when an
overheat condition occurs, either
at the heat chamber or blower
outlet. The switch “opens” the
electrical circuit to the gas control
thereby shutting off gas flow. The
switch has a button located in its
center that will need to be pushed
in to reset the contacts if the
contacts open due to an overheat
condition.
J. Manifold
Series of nipples or elbows that
convey the gas from the outlet of
the gas control valve to the burner
orifice.
K. Motor
An electrically powered device,
located in the air housing, in
conjunction with the fan wheel to
circulate air in the confinement
area.
L. Pilot Burner Bracket A small gas burner used to direct
flame for igniting gas at the main
burner and to heat the
thermocouple.
M. Pilot Orifice
August 1999
Metering device used to supply gas
for the dual purpose of igniting the
main burner and heating the
thermocouple.
8.1-3
3
Servicing
Instructions
Component Identification and Function
N. Pilot Safety
Control Valve
A gas control valve which is held
open by electrical power supplied
by a pilot generator and which
closes automatically to shut off the
flow of gas to the main burner when
the pilot flame is extinguished or
becomes too small to light the main
burner. Additionally, it consists of
electrical solenoids which are used
for the control of gas flow to the
main burner. Features of some gas
controls are an
internal low
pressure regulator and gas shut off.
O. Shield
A formed piece of metal that
surrounds the pilot bracket to
protect the pilot flame against
drafts.
P. Regulator
Mechanical devices used in gas
distribution systems. Its purpose is
to reduce a higher inlet pressure to
a preset lower pressure. The
regulator is responsible to supply a
steady outlet pressure to the
heater(s) despite changes in inlet
pressure, heater demand, and
weather conditions.
Q. Thermostat
Electrical control which is basically
used as an on/off switch that
responds to changes in room
temperature.
R. Thermocouple
Thermoelectric
device
that
converts heat energy into electrical
energy. Works in conjunction with
the power unit electromagnet
within the gas control valve to
provide gas to the pilot light.
8.1-4
4
August 1999
Servicing
Instructions
Model AS040
Fan and Motor
Cleaning the Fan:
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the heater.
5. Clean the fan with a soft brush, rag, or compressed air.
2. Remove the motor access panel on the case back.
3. Disconnect the motor wires from the terminal strip.
4. Remove the screws that hold the motor mount to the
heat chamber. Pull the fan and motor assembly from
the heater.
Motor and Fan Replacement:
Follow steps 1 - 4 above and then proceed as follows:
3. To reassemble, reverse the procedures.
1. Using the appropriate allen wrench, loosen the set
screw on the fan hub.
Hub
2. Remove the nuts that hold the motor to its mounting
bracket.
IMPORTANT
■ Install the fan so its hub and set screw are pointed
toward shaft end, away from motor.
■ Fan hub must be flush with end of motor shaft.
Nut
August 1999
■ Position set screw of fan to flat of motor shaft
before tightening.
8.2-1
1
Servicing
Instructions
Model 377/379
Fan and Motor
Cleaning and Replacing the Fan:
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Remove the access panel at the end of the heater
opposite burner.
5. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary. All L.B. White fan wheels
incorporate a wheel puller groove on the fan hub to
assist in fan removal.
3. Remove the air inlet ring screws.
6. Clean the fan wheel using a soft brush, rag, or
compressed air paying particular attention to
individual fan blades to remove dirt build up.
4. Using the appropriate wrench, loosen the fan wheels
set screw.
Set Screw
Replacing the Motor
Follow steps 1 - 5 above and then proceed as follows:
1. Remove the four nuts that hold the motor to the
housing panel.
2. Pull the motor from the housing. To allow easier motor
removal you may need to remove the thermostat or
junction box from the heater’s base.
3. Disconnect the motor leads
4. To reassemble, reverse all procedures.
IMPORTANT
■ Make sure that the fan does not rub on the inlet ring
of the fan housing.
■ Make sure set screw(s) of fan are on flats of motor
shaft when tightening.
■ Fan wheel to inlet ring spacing must be 1/8 in.
Nut
8.2-2
2
before tightening fan to shaft.
August 1999
Servicing
Instructions
Models 346/348, 408/410, AB200, AB250
Fan and Motor
Cleaning the Fan:
1. Shut off the gas supply to the heater and disconnect
the heater from its electrical supply.
4. Remove the screws that secure the motor mount plate
to the fan housing.
2. Open or remove the access panel on the end of heater
opposite burner.
5. Lift and pull the motor and fan assembly from housing.
3. Disconnect the motor leads.
6. Clean the fan wheel using a soft brush, rag, or
compressed air, paying particular attention to
individual fan blades to remove dirt build up.
Motor and Fan Replacement:
4. To reinstall motor and wheel, reverse these
procedures.
Follow steps 1 - 5 above and then proceed as follows:
1. Loosen the set screw(s) on the fan wheel.
2. Pull the fan wheel from the motor shaft. Use a wheel
puller, if necessary. All L.B. White fan wheels
incorporate a wheel puller groove on the fan hub to
assist in fan removal.
IMPORTANT
■ Make sure that the fan does not rub on the inlet ring
of the fan housing.
■ Make sure set screw(s) of fan are on flats of motor
shaft when tightening.
■ Fan wheel to motor mount plate spacing must be at
proper clearance before tightening fan to shaft.
Refer to the following table and illustration.
Model
346/348
Clearance
1/4 in.
408/410
AB200, AB250
1/8 in.
3. Remove the nuts that hold the mounting plate to the
motor.
Nuts
August 1999
CLEARANCE
8.2-3
3
Servicing
Instructions
Air-Proving Flapper (Sail)
The flapper is located in the blower outlet. As discussed in
Section 9.1, Component Identification and Function, its
purpose is to assist the air-flow switch in establishing proper
air pressure and, therefore, fan speed is achieved before the
gas valve opens. However, over a period of time, the flapper
may accumulate deposits of dust or dirt affecting its ability to
pivot, thereby creating system failures. It then will be
necessary to check this mechanism for operation.
Cleaning/Adjusting Procedure:
1. Disconnect the electrical supply and shut off gas to the
heater.
2. Make sure the sail moves up and down freely. Check
for debris, burrs or housing alignment that would
cause the pivot points of the flapper to bind. Clean
with a soft brush or compressed air if necessary.
5. Using a needle nose pliers, gently bend up the arm of
the flapper (NOT THE SWITCH ARM) in increments until
the sail arm engages the switch arm, closing the
contacts of the switch when the sail body trailing edge
is 1 in. up off of housing bottom or rivet.
3. The arm of the flapper should engage the arm of the
switch when the trailing edge of the flapper body is
lifted approximately 1 1/4 in. to 1 3/8 in. off the
housing bottom or rivet (if supplied). At this distance
you should hear an audible click which are the
contacts closing within the switch.
4. If the switch contacts do not close within this distance,
then manually push in the switch arm to make sure the
switch is not defective. If a “click” is heard, normally
the switch is good and the sail arm then needs to be
adjusted. (If in doubt, check for continuity.)
Trailing Edge
Rivet
Replacing the Flapper:
If the flapper ever needs replacement, you will need to
remove the fan and motor assembly from the housing. (See
Section 6.2) You can now pull up on the main body of the
flapper, thereby popping it from its mounting holes. To
replace the flapper, bend the pivot point (opposite air-proving
switch) down just enough so it allows the flapper to mount in
the support holes. Once installed, push down with enough
force nearest this pivot point to realign the pivot and the
flapper body. Test the flapper to make sure that its arm
engages the air-flow switch arm properly and that the
contacts of the switch close within the prescribed distance.
8.3-1
1
August 1999
Servicing
Instructions
Air-Proving Switch
For Units With Flapper:
1. Shut off gas supply and disconnect heater from
electrical source.
2. Disconnect air-proving switch leads.
Make sure on reassembly that two nuts per screw are
used as spacers between the switch and housing side
panel. These nuts are tightened securely against the
housing side panel. Slide the switch onto the screws
and secure the switch in place using the two
remaining nuts.
3. Some models may have the air-proving switch
mounting nuts located on the inside of the fan
housing. Remove the motor and fan assembly from
the housing. Remove the nuts and pull the switch and
screws from the housing.
Two Spacer Nuts
per Screw
4. The replacement switch will ship with appropriate
quantity of nuts and two screws. Mount the
replacement switch so each mounting screw head is
located inside the fan housing with threads exposed
to the switch side of the housing.
Screw Heads
Flapper
Arm
NOTE:
When replacing the switch, make sure the arm of the switch
is located above the flapper arm.
ATTENTION
Flapper
■ Model 346 heaters do not include air proving
devices.
■ Model AS040 heaters incorporate a centrifugal
switch within the motor to prove that the motor as
turning at proper speed before supplying power to
the gas control valve. The centrifugal switch cannot
be replaced. If it fails, replace the motor.
August 1999
8.4-1
1
Servicing
Instructions
Pilot Assembly
CAUTION
4. Clean the pilot assembly using a soft brush or
compressed air.
Allow the pilot assembly to cool before servicing.
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the heater.
2. Open the burner end access door or remove the
access panel.
3. Remove the screw(s) that secure the pilot assembly to
the burner.
5. If necessary, use the appropriate wrench to loosen the
pilot line’s compression nut at the orifice inlet and to
remove the orifice from the pilot bracket. You may
need to remove the pilot bracket from the burner to
accomplish this.
ATTENTION
Pilot Line Nut
Some models may require removal of a single wing screw
which holds the pilot assembly to the burner.
Wing Screw
Orifice
8.5-1
1
August 1999
Servicing
Instructions
Pilot Assembly
6. Pilot orifices may incorporate one or two holes,
depending on design. Hold the orifice up to light to
make sure the orifice is clear of blockages.
8. Reverse these procedures to reinstall the orifice, pilot
line and shield.
ATTENTION
Holes
For Heaters so Equipped:
■ Use care when servicing the pilot assembly to
prevent damage to the pilot gasket.
■ Make sure the pilot gasket is properly positioned
around the two vertical ribs on the face of the
burner before reassembly. Failure to properly
install the gasket will result in pilot outages.
■ Use the pilot assemblies’ threaded stud to assist
in holding the pilot in position during reassembly.
7.
If the orifice is plugged, blow out the orifice with
compressed air or replace the pilot orifice if the
blockage cannot be removed.
IMPORTANT
■ The hole(s) in the pilot orifice are drilled to a
specific size to match the fuel and gas pressure.
Gasket
Stud
■ Do not poke or push sharp instruments into the
orifice hole(s). This may create pilot light outages
or sooting.
Burner Ribs
■ Do not use a pliers to remove the pilot orifice.
Pliers will round off the hex nut on the base of
orifice, creating difficulty in servicing later. Use
only the appropriate size wrench.
■ Do not “kink” the pilot line when servicing. Doing
so may reduce gas flow to the pilot orifice
resulting in pilot outages.
August 1999
8.5-2
2
Servicing
Instructions
Thermocouple
CAUTION
4. Remove the connector nut at the power unit on the gas
control valve.
Allow the pilot assembly to cool before servicing.
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the heater.
2. Remove the screw(s) that secure the pilot assembly to
the burner.
Nut
5. To reassemble, reverse these procedures.
3. Pull down on the thermocouple to disengage its
retaining clip from the pilot bracket, or loosen the
attachment nut (if so equipped).
6. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
7. Light the pilot.
8. Start the heater and check for proper operation.
ATTENTION
■ The thermocouple is an important safety device
which works directly with the pilot safety control
valve. It should only be replaced with a
thermocouple that has proper tip length to
prevent pilot outages. See parts lists to order the
appropriate thermocouple.
■ When threading the thermocouple’s connector
nut back into the power unit on the pilot control
valve, thread the nut in finger tight and then snug
it in place with the appropriate wrench. DO NOT
USE UNNECESSARY FORCE WHEN TIGHTENING,
otherwise the power unit in the control valve may
be destroyed.
8.6-1
1
August 1999
Servicing
Instructions
Thermocouple
■ Do not use pliers when removing or tightening the
■ Insure the thermocouple is fully and firmly
■ Insure dirt or debris has not fallen into the power
■ Do not make sharp kinks or bends in the
attachment nut or connector nut. Doing so will
round off the nuts creating service problems.
unit prior to thermocouple installation. Dirt and
debris will block the electrical pathway of the
thermocouple, creating pilot outages.
August 1999
positioned in the pilot bracket by either its
attaching nut or clip.
thermocouple’s copper tube.
damage the thermocouple.
Doing so may
8.6-2
2
Servicing
Instructions
High-Limit Switch Replacement
Very little actual servicing of the high-limit switch is required.
However, it is good to know the location of the switch when
working on the heater. Typically, the switch is located on the
heat chamber face or at another similar location at the
burner end of the heater. Some models may have the switch
located on a bracket near the burner.
thickness may vary with model and design.
appropriate parts list.
Refer to
Spacer
Other heater designs may have the switch mounted directly
to the flat of the heat chamber face. Familiarize yourself with
switch mounting characteristics.
Without
Spacer
Depending upon model, and design sequence, some heaters
used a spacer between the legs of the high limit switch and
the heat chamber. These allowed the switch to open at the
proper temperature. If your heater is so equipped, insure the
spacers are reinstalled prior to mounting the switch. Spacer
8.7-1
1
August 1999
Servicing
Instructions
High-Limit Switch Replacement
Specifically relating to the AB200 heater, the high limit is a
capillary and switch mounted to a bracket near the burner.
If switch replacement is necessary you will need to route the
capillary behind the burner, and then across the heat
chamber face, allowing 12 inches of capillary to be in
contact with the heat chamber. The capillary is held in
position by tabs that are formed from the heat chamber.
Insure you have also installed the spacer clips on the
capillary to prevent premature high limit tripping.
ATTENTION
■ Four spacer clips are required per switch (spacer
part #130-09051).
■ Install and position the spacers as illustrated.
■ Do not kink the capillary tube, or pinch it between
the formed tabs and the heat chamber by using
unnecessary force.
Capillary damage with
subsequent switch failure will occur.
Dashed Line
Indicates
Capillary Routing
Behind Burner
Capillary Routed
Over Spacer
Capillary Beneath
Spacer
High Limit Switch
12”
Formed Tabs
August 1999
Spacer
8.7-2
2
Servicing
Instructions
Burner and Burner Orifice
Over a period of time, the burner and orifice may start to
become blocked if cleaning is not provided. This can create
poor burning of the fuel gas, resulting in nuisance heater
problems. Removal of burner and orifice may be required if
blockages cannot be removed by general cleaning. If
removal is necessary, refer to the following instructions.
Familiarize yourself with these procedures before
disassembly.
1. Shut off the gas supply to the heater and disconnect
the heater’s electrical supply. Allow heater to cool.
2. Remove the hose and sediment trap from the inlet of
the gas control valve.
3. Remove the burner retaining bolt or screws from the
underside of the heater.
Bracket
Bolt
4. Open the burner end access panel (if applicable).
5. Remove the protective cover from over the control
valve (if applicable).
6. The gas control valve with manifold can now be
readied for removal from the heater. This procedure
varies slightly depending on model and age of the
heater. Some models allow the removal of two screws
that can be accessed at the control valve inlet.
Bracket
Others may also require removal of a bolt that secures
the control valve to the heater base.
Some may require removal of a bracket at the control
valve inlet, or beneath the throttle valve on the
manifold.
8.8-1
1
August 1999
Servicing
Instructions
Burner and Burner Orifice
7.
Remove the two screws and spacers located at the
right and left hand top of the burner casting (if
applicable).
Screw
8. Disconnect the electrical leads, pilot line, and
thermocouple from the gas control valve.
9. Remove the burner and valve/manifold assembly from
the heater. Some larger models may require you to
pivot the valve and manifold assembly to remove the
orifice from beneath the burner.
10. Hold the burner casting up to a light. If it appears
plugged, then use compressed air to try and remove
the blockage. If this is not successful, straighten a
wire coat hanger and push it up from the gas inlet end
of the casting, moving it around vigorously to dislodge
dust, dirt, insect nests, etc. Blow out with compressed
air.
August 1999
Orifice
11. Check the orifice for external build up of dust. Brush
or blow off as necessary. If it still appears plugged,
remove and inspect the burner orifice. Blow out the
orifice hole with compressed air until the hole is open.
Also, inspect the manifold area into which the orifice
was threaded to make sure there aren’t any
blockages. If necessary, remove that portion of the
manifold and clean it also.
12. Reassemble all components. Use pipe thread
compound on threaded connections.
13. Restart the heater. Check for proper burner flame
characteristics and for gas leaks.
8.8-2
2
Servicing
Instructions
Leak and Gas Pressure Checks
Equipment Required:
A. Preparation
1 - 3/16 Hex Head Allen Key
1. Make sure all threaded connections to the inlet of the
control valve are tightened securely. Obtain two
pressure gauges capable of reading up to 35 in. W.C.
2 - Low Pressure Gauge Kits,
Part Number 550-00764
2. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.
Certified Leak Detectors
3. Open or remove the burner access panel. Remove the
protective cover from over the control valve, if
applicable.
ATTENTION
This procedure is to be done once a year prior to the heating
season, any time the appliance is moved from one location
to the other, or after servicing the heater.
WARNING
Fire and Explosion Hazard
4. Brush or blow off any dust or dirt on or in the vicinity
of the gas control valve.
B. Gauge Installation
1. Locate the inlet and outlet pressure taps.
■ Do not disassemble the gas control valve.
■ Do not attempt to replace any components on the
gas control valve.
■ The gas control valve must be replaced if any physical
damage occurs to the control valve assembly.
■ Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans and
livestock, and building damage.
Inlet
Pressure
Tap
Outlet
Pressure
Tap
ATTENTION
■ The following explains a typical procedure to be followed
in checking gas pressures on control valves.
■ The gas pressures will vary depending upon heater
model and fuel type.
■ Consult the dataplate or the heater specification on
pages 4 and 5 in this guide for specific pressures to be
used in conjunction with this procedure.
2. Using a 3/16 in. allen key, remove the taps at the inlet
and outlet of the control valve and install a threaded
gauge adapter and a low pressure gauge at these
points. Since some heaters used control valves from
different manufacturers, the location of the pressure
taps may vary slightly.
■ Gas pressure measured at the inlet to the gas valve is
Inlet Pressure and gas pressure measured at the outlet
of the gas valve is Burner Manifold Pressure.
8.9-1
1
August 1999
Servicing
Instructions
Leak and Gas Pressure Checks
Gauge
Adapter
a. Check all pipe connections, hose connections,
fittings and adapters upstream of the gas control
with approved gas leak detectors. In the event a
gas leak is detected, check the components
involved for cleanliness and proper application of
pipe compound before further tightening.
b. Tighten the gas connections as necessary to stop
the leak.
c. After all connections are checked and any leaks
are stopped, start the heater so the main burner
ignites.
d. Stand clear while the main burner ignites to
prevent injury caused from hidden leaks that could
cause flashback.
e. With the main burner in operation, check all
connections, hose connections, fittings and joints
as well as the gas control valve inlet and outlet
connections with approved gas leak detectors.
f. If a leak is detected, disconnect the heater from its
electrical supply and close the fuel supply valve to
the heater.
Valve shown is outside of heater for clarity of view.
C. Leak Check
WARNING
Fire and Explosion Hazard
■ Do not use open flame (matches, torches, candles,
etc.) in checking for gas leaks.
■ Use only approved leak detectors.
■ Failure to follow this warning can lead to fires or
explosions.
■ Fires or explosions can lead to property damage,
personal injury or loss of life.
g. Check the components involved for cleanliness in
the thread areas and proper application of pipe
compound.
h. Tighten the gas connection as necessary to stop
the leak. If necessary, replace the parts or
components involved if the leak cannot be
stopped. Ensure all gas leaks have been identified
and repaired before proceeding.
1. Check all connections for gas leaks using approved
gas leak detectors. Gas leak testing is performed as
follows:
August 1999
8.9-2
2
Servicing
Instructions
Leak and Gas Pressure Checks
D. Reading Pressures
1. With the heater operating, the pressure gauges
should read the pressures specified on the dataplate,
or in the specification section of this guide.
b. Using a standard screwdriver, turn the plastic
adjusting screw until the gauge reads proper
manifold pressure. Clockwise increases outlet
pressure.
Counterclockwise will decrease
pressure.
2. Do the readings at the inlet and outlet pressure
gauges agree with that specified on the dataplate? If
so, then no further checking or adjustment is
required. Proceed to Section F.
3. If the inlet pressures do not agree with that specified
on the dataplate, then the building system regulator
controlling gas pressure to the heaters requires
adjustment.
4. If the inlet pressures are correct but the burner
manifold pressure does not agree with that specified
on the dataplate, then the gas control valve’s internal
pressure regulator requires adjustment. Proceed to
Section E.
E. Burner Manifold Pressure Adjustment
c. Reinstall regulator cap on valve.
Refer to the following instructions, after proper inlet pressure
has been established.
NOTE:
1. Light the heater. Once the heater has lit, observe at
the manifold (outlet) pressure gauge. Burner manifold
pressure must be the same pressure as given on the
dataplate.
Procedures for adjusting outlet pressure on control valves
used on earlier models are the same. However, the internal
regulator on the valve is at a slightly different location.
2. If the manifold pressure does not correspond to the
manifold pressure given on the dataplate, the outlet
pressure must be adjusted at the valve by following
these instructions.
(This procedure must be
accomplished with the burner on.)
3. Close the fuel valves and disconnect the electrical
supply to the heater.
a. Remove the regulator cap on the control valve to
expose the output pressure adjusting screw.
5. Open the fuel supply valves and reconnect heater to
electrical supply. Test heater for proper operation.
(Valve shown outside of heater for clarity of viewing.)
4. Remove gauges and adapters and reinstall the
pressure tap plugs, tightening both securely.
F. Completion
1. Once inlet and burner manifold pressures have been
confirmed and/or properly set, close the fuel supply
valve to the heater and allow the heater to burn off any
as remaining in the gas supply line.
2. Disconnect the heater from its electrical supply.
Regulator
Cap
8.9-3
3
3. Remove the gauges and connecting hoses.
4. Reinstall the pressure tap plugs and tighten securely.
Check for gas leaks to insure the tap screws have
seated properly.
August 1999
Servicing
Instructions
Leak and Gas Pressure Checks
The preceding instructions dealing with inlet and manifold
pressure checks and leak testing generally apply to all
control valves. However, due to model and age variations of
heaters, there are several differences between control
valves with which you must be familiar.
Pilot
Button
■ Part number 500-02309 has burner manifold pressure
taps located on either side of the control valve’s main
solenoid.
■ The inlet pressure tap is located near the pilot button
and pilot line connection.
■ This control valve does not incorporate an internal gas
shut off nor low pressure regulator. All pressure
adjustments must be made at the second-stage
regulator supplying gas to the heater. Additionally, the
gas supply will need to be shut off at the supply line to
isolate the heater.
August 1999
Pilot Line
Connection
Inlet
Pressure
Tap
Manifold
Pressure
Tap
8.9-4
4
Service Parts,
Kits and Accessories
Parts Identification Guide
The parts identification guides on the following pages have
been designed to give a quick reference to component parts
used on pilot ignition agricultural building heaters. The
guides identify components not only used on current
production, but also on equipment that is of earlier design.
To use the guides properly, you should know the model
numbers of the heater and its design sequence. This
information is identified on the dataplate. Some models
may have the design sequence shown as the 4th digit of the
model number. For other models, the dataplate will identify
a configuration number. The design sequence is the first
digit of the configuration number.
In many cases you will find components are common
between different designs of the model number. Parts lists
and schematics are shown on the following pages for the
respective heaters.
The parts guides also identify part numbers for the most
commonly requested components, wires, and hardware
items used on the heaters. If a wire, nut, or screw, etc. is not
identified, please contact the L. B. White Co. for parts
ordering information.
Dataplate Comparison
MODEL 346K
AW075EHP3
DES I GN
ERI CA N
AM
A
G S
CE
RTI FI ED
MAXIMUM INPUT: 75,000
BTUH
60,000 BTUH
TYPE FUEL: PROPANE VAPOR WITHDRAWAL
BURNER MANIFOLD PRESSURE 10
11 IN W.C. AT MAXIMUM INPUT
ELECTRICAL: 115 VOLTS A.C. 60 HZ SINGLE PHASE 1.4 AMPS
MIN. CLEARANCES FROM HEATER TO ADJACENT COMBUSTIBLE MATERIALS: REAR 16 FT
IN. SIDES 16FT
IN.
IN. BLOWER OUTLET 6 FT AND FUEL CONTAINER 6 FT
TOP TO CEILING 16FT
VENTILATION: 450
250 CFM OF AIR REQUIRED TO SUPPORT COMBUSTION.
MAXIMUM 13.5 INCHES W.C. AND MINIMUM 11.5 INCHES W.C. GAS SUPPLY PRESSURE
ACCEPTABLE AT INLET 0F HEATER FOR PURPOSE OF INPUT ADJUSTMENT.
POSITION HEATER AWAY FROM LIVESTOCK
AGRICULTURAL BUILDING HEATER
L. B. WHITE CO., INC. W6636 L.B. WHITE ROAD ONALASKA, WI 54650 608/783-5691
August 1999
MODEL AW060
AB250
APPD110004
CONFIGURATION NO. AHPD210000
SERIAL NO.:
Design
Sequence
DES I GN
ERI CA N
AM
A
G S
SS
OCI ATI O
A
SS
OCI ATI O
A
Design
Sequence
N
SERIAL NO.:
With Configuration Number
N
Without Configuration Number
CE
RTI FI ED
MAXIMUM INPUT: 60,000
250,000 BTUH
BTUH
TYPE FUEL: PROPANE VAPOR WITHDRAWAL
BURNER MANIFOLD PRESSURE 10.0 IN W.C.
AT MAXIMUM INPUT
ELECTRICAL: 115 VOLTS A.C. 60 HZ SINGLE PHASE 1.5 AMPS
MIN. CLEARANCES FROM HEATER TO ADJACENT COMBUSTIBLE MATERIALS: REAR 1 FT SIDES 1 FT
TOP TO CEILING 1 FT BLOWER OUTLET 6 FT AND FUEL CONTAINER 6 FT
VENTILATION: 1050
240 CFM OF AIR REQUIRED TO SUPPORT COMBUSTION.
MAXIMUM 13.5 INCHES W.C. AND MINIMUM 11.5 INCHES W.C. GAS SUPPLY PRESSURE
ACCEPTABLE AT INLET 0F HEATER FOR PURPOSE OF INPUT ADJUSTMENT.
POSITION HEATER AWAY FROM LIVESTOCK
AGRICULTURAL BUILDING HEATER
L. B. WHITE CO., INC. W6636 L.B. WHITE ROAD ONALASKA, WI 54650 608/783-5691
9.1-1
1
Service Parts,
Kits and Accessories
Parts Identification Guide
Model AS040
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Description
Regulator, Second Stage, Vent Over Side (LP Gas)
Regulator, Single Stage (Natural Gas)
Nipple, 1/2 x 3 1/2
Valve, Manual Shut-O
Off
Hose, 1/2 x 10 ft.
Sediment Trap
Adapter, 1/2 NPT x 1/2 NPS
Nipple, 3/8 x 1 1/2
Bushing
Bolt
Valve, Gas Control (LP Gas or Natural Gas)
Cap, Pilot
Bracket, Terminal Strip
Terminal Strip
Cover, Terminal Strip
Manifold (LP Gas)
Manifold (Natural Gas)
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Burner
Thermocouple, 18 in.
Tube, Pilot
Orifice (LP Gas)
Orifice (Natural Gas)
Screw, Pilot
Pilot Assembly with Orifice (LP Gas)
Pilot Assembly with Orifice (Natural Gas)
Shield, Pilot (LP Gas)
Shield, Pilot (Natural Gas)
Switch, High Limit
Spacer
Clip
Door, Burner End (1)
Handle
Panel, Air Inlet
Panel, Motor Access
Case Assembly (1)
Housing, Fan
Fan Blade
Mount, Motor
Spacer
Motor
Chamber, Heat
Holder, Burner
Bracket, Manifold
Base
Cord, Power
Design Sequence
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Part Number
550-0
06665
550-0
01326
130-0
07148
130-0
05548
550-2
20543
500-0
00815
310-0
02894
130-0
02421
130-0
01195
130-0
05576
500-0
02309
130-0
06844
225-0
08245
120-0
08253
225-0
08246
400-0
08774
400-0
08780
310-0
08666
310-0
08667
110-0
08766
120-0
01090
410-0
08769
130-0
02689
130-0
02740
130-0
08048
130-0
02729
130-0
02741
220-0
03408
220-0
06534
120-0
05566
130-0
08375
130-0
01759
271-0
08759
410-0
09297
271-0
08760
271-0
09071
400-0
08775
400-0
08988
130-0
08746
220-0
08764
130-0
08375
120-0
08745
400-0
08772
260-0
08757
220-0
09012
220-0
08765
120-0
08285
(1) Specify fuel gas type and model number when ordering.
DESCRIPTION
Wire, Harness,
High Limit Switch
9.1-2
2
WIRE SELECTION TABLE
COLOR
LENGTH
Black
20 in.
PART NO.
430-08768
FASTENER SELECTION TABLE
DESCRIPTION
APPLICATION
PART NO.
Screw
Case
130-02330
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
28
Model AS040
31
29
30
27
37
25
24
32
26
33
23
38
34
22
16
35
17
21
11
20
36
14
19
13
18
40
12
15
6
41
39
42
10
9
5
1
INSTALLATION OF GAS TRAIN ASSEMBLY
FOR NATURAL GAS ONLY
1
2
3
7
4
8
8
August 1999
7
9.1-3
3
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 346 and 348
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
(1)
(2)
(3)
N/A
Description
Regulator, Single Stage (LP Gas)
Regulator, Second Stage (LP Gas)
Regulator, Single Stage (Natural Gas)
Regulator, Second Stage (Natural Gas)
Hose, 1/4 in. ID x 10 ft.
Hose, 1/2 in. ID x 10 ft.
Adapter, 1/4 NPT x 9/16-1
18
Valve, Manual Shut-O
Off
Bushing, 3/8 NPT x 1/4
Bushing, 1/2 x 1/4
Nipple, 1/2 x 1 1/2
Bushing, 1/2 x 3/8
Nipple, 3/8 x 1 1/2
Adapter, 1/2 NPT x 1/2 NPS
Thermostat with Bracket
Junction Box
Cover, Junction Box
Cord, Power, 5 ft.
Bracket, Thermostat
Valve, Pilot Gas Control (LP Gas or Natural Gas)
Valve, Pilot Gas Control (LP Gas)
Valve, Pilot Gas Control (Natural Gas)
Cap, Pilot, Gas Control Valve
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Burner Casting
Burner Casting
Pilot Assembly with Orifice (LP Gas)
Pilot Assembly with Orifice (Natural Gas)
Orifice, Pilot (LP Gas)
Orifice, Pilot (Natural Gas)
Shield, Pilot
Tube, Pilot with Nuts
Tube, Pilot with Nuts
Thermocouple, 21 in.
Base
Base
Motor
Mount, Motor
Wheel, Fan
Housing, Fan
Switch, High Limit
Cover, High Limit
Case, Assembly
Handle
Chamber, Heat
Chamber, Heat
Bracket, Gas Control Valve
Cover
Sediment Trap
For replacement control valve, order conversion kit
part 500-03398.
Not used on E and F designs.
Specify fuel gas type and model number when ordering.
Not Applicable.
DESCRIPTION
Wire, High Limit
9.1-4
4
WIRE SELECTION TABLE
COLOR
LENGTH
DESIGN
Black
25 in.
All
PART NO.
430-06373
E
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(1)
N/A
N/A
Design Sequence
F
G
H
J
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(1)
X
X
X
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
X
N/A
X
X
X
X
X
X
X
N/A
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
(2)
X
X
X
X
X
X
X
X
X
(2)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
K
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
N/A
X
X
X
N/A
X
X
X
X
X
N/A
X
X
X
X
x
X
X
X
X
X
X
N/A
X
X
X
X
Part Number
550-0
06772
550-0
06665
550-0
01326
500-0
06408
550-2
20543
400-2
20504
310-0
01098
130-0
05548
130-0
01544
130-0
01519
130-0
02420
130-0
01195
130-0
02421
310-0
02894
500-0
05568
120-0
03230
120-0
03231
120-0
01220
220-0
05493
500-0
02309
F120-8
86302
410-2
21410
130-0
06844
310-0
03418
310-0
01297
320-0
08026
320-0
03410
130-0
02729
400-0
02741
130-0
02689
130-0
02740
220-0
08205
550-0
03032
550-2
21380
120-0
03497
220-2
21412
220-2
21412
500-0
07487
220-0
05490
130-0
02808
500-0
05579
120-0
05566
220-0
05567
500-0
01212(3)
410-0
09297
410-0
09297
420-0
07767
225-2
22095
225-2
22096
500-0
00815
FASTENER SELECTION TABLE
DESCRIPTION
Screw, 8 x 3/4 Sheet Metal
Screw, 10-24 x 1/4 Machine
Bolt, 3/8 - 16 x 5/8
Spacer
Screw
Washer
Screw
APPLICATION
DESIGN
High Limit Switch, Mounting
All
Burner Mounting
E-J
Gas Control Valve to Base
E-J
Gas Control Valve to Base
E-J
All Other Applications
All
Burner Mounting
K
Burner Mounting
K
PART NO.
130-02330
130-08028
130-05576
130-05489
130-07289
130-01589
130-03068
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 346 and 348
33
32
34
31
30
29
28
27
19
26
17
20
16
22
24
1
9
8
25
36
21
18
9
35
8
1
23
16
14
4
15
13
5
L
RA
TU PPLY
A
N
TO AS SU
G
2
11
12
3
6
2
37
10
SEDIMENT TRAP KIT
OPTIONAL ACCESSORY
August 1999
4
9.1-5
5
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 377 and 379
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
(1)
(2)
N/A
Description
Regulator, Single Stage (LP Gas)
Regulator, Single Stage (LP Gas)
Regulator, Second Stage (LP Gas)
Regulator, Single Stage (Natural Gas)
Adapter, Hose, 3/8 NPT x 1/2 NPS
Adapter, Hose, 1/2 NPT x 1/2 NPS
Hose, 1/2 in. ID x 10 ft.
Junction Box
Cover, Junction Box
Thermostat with Bracket
Bracket
Cord, Power, 5 ft.
Cord, Power, 10 ft.
Base, Terminal Board
Cover, Terminal Board
Valve, Manual Shut Off
Nipple, 1/2 x 1 1/2
Valve, Gas Control (LP Gas or Natural Gas)
Valve, Gas Control (LP Gas)
Valve, Gas Control (Natural Gas)
Cap, Pilot
Bushing, Reducing
Tube, Pilot with Nuts
Tube, Pilot with Nuts
Orifice, Pilot (LP Gas)
Orifice, Pilot (Natural Gas)
Pilot Assembly with Orifice (LP Gas)
Pilot Assembly with Orifice (Natural Gas)
Thermocouple, 21 in.
Shield, Pilot
Shield, Pilot
Holder, Orifice
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Manifold, U-S
Shape
Manifold, Welded
Burner, Casting
Gasket
Screw, Burner Mounting
Stud, Pilot
Screw, Pilot
Spacer, Burner
Switch, High Limit
Washer
Chamber, Heat
Case, Assembly
Panel, Case, Burner End
Panel, Case, Opposite Burner
Ring, Inlet
Fan, Wheel
Flapper
Housing, Fan with Air Proving Switch and Flapper
Switch, Air Proving
Motor
Base
Washer
Bolt, Burner
Bolt, Burner
Bracket, Gas Control Valve
Screw
Spacer, Nylon
Sediment Trap
Design Sequence
F
G
H
J
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(1)
X
X
X
N/A N/A N/A N/A
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
N/A N/A N/A N/A
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
X
X
X
X
K
N/A
X
X
X
N/A
X
X
X
X
X
X
X
X
N/A
N/A
X
N/A
N/A
X
X
N/A
N/A
N/A
X
X
X
X
X
X
N/A
X
N/A
N/A
N/A
X
X
N/A
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
Part Number
550-0
06772
410-2
21408
550-0
06665
550-0
02736
310-0
03536
310-0
02894
400-2
20504
120-0
03230
120-0
03231
500-0
05568
220-0
05493
120-0
03438
120-0
03015
120-2
20171
500-0
02686
130-0
05548
130-0
02420
500-0
02309
120-2
21839
120-2
21840
130-0
06844
130-0
01519
130-0
03580
410-2
21526
130-0
02689
130-0
02740
130-0
02729
130-0
02741
120-0
03497
220-0
03509
220-2
20264
310-0
02690
310-0
03518
310-0
03519
310-2
21525
310-2
21528
410-0
07061
420-0
07826
320-0
03453
130-0
06974
130-0
02688
130-0
07827
130-0
03070
130-0
02687
120-0
05566
130-0
02686
400-2
21522
500-0
05628 (2)
271-0
07334 (2)
271-0
07335
220-0
05507
130-0
03531
410-0
02941
500-0
05572
500-0
02680
550-0
06008
220-2
20145
130-0
01589
130-0
02692
130-0
07908
220-2
21043
130-0
09425
130-0
07905
500-0
00815
For replacement control valve, order conversion kit part 500-03398.
Specify fuel gas type and model number when ordering.
WIRE SELECTION TABLE
Not Applicable.
FASTENER SELECTION TABLE
DESCRIPTION
APPLICATION
Screw, # 8 x 3/8
Case Assembly
9.1-6
6
E
X
N/A
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
(1)
N/A
N/A
X
X
X
N/A
X
X
X
X
X
X
N/A
X
X
X
N/A
N/A
X
N/A
X
N/A
X
N/A
X
X
X
X
X
X
X
X
N/A
X
N/A
X
N/A
X
X
X
X
N/A
N/A
N/A
N/A
X
PART NO.
130-07288
DESCRIPTION
Wire, Thermostat to
Terminal Board
Wire, High Limit Switch
Wire, Air Flow Switch
COLOR
Black
LENGTH
16 in.
DESIGN
All
PART NO.
430-07227
Black
Black
25 1/4 in.
14 in.
All
All
430-03105
430-05557
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 377 and 379
35
34
33
36
37
32
31
30
29
24
18
25
20
17
39
28
26
16
1
27
38
19
23
14
41
22
13
10
21
40
15
9
12
AL LY
UR PP
T
U
NA S S
GA
42
12
11
4
8
2
5
22
1
6
3
7
23
43
47
48
44
13
46
45
August 1999
SEDIMENT TRAP KIT
OPTIONAL ACCESSORY
9.1-7
7
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 408 and 410
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
(1)
(2)
(3)
N/A
Description
Regulator, Single Stage (LP Gas)
Regulator, Second Stage (LP Gas)
Regulator, Single Stage (Natural Gas)
Regulator, Second Stage (Natural Gas)
Hose, 1/2 in. x 10 ft.
Adapter, 1/2 NPT x 1/2 NPS
Valve, Manual Shut Off
Nipple, 1/2 in. x 3 1/2 in.
Elbow
Valve, Gas Control (LP Gas and Natural Gas)
Valve, Gas Control (LP Gas)
Valve, Gas Control (Natural Gas)
Cap, Pilot Safety
Bushing
Nipple, 1/4 in. x 3 in.
Holder, Orifice
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Screw
Spacer, Nylon
Manifold
Bracket
Thermocouple, 21 in.
Tube, Pilot with Nuts
Tube, Pilot with Nuts
Orifice, Pilot (LP Gas)
Orifice, Pilot (Natural Gas)
Pilot Assembly with Orifice (LP Gas)
Pilot Assembly with Orifice (Natural Gas)
Gasket, Pilot
Shield, Pilot (LP Gas)
Shield, Pilot (Natural Gas)
Shield, Pilot (LP and Natural Gas)
Burner (LP Gas)
Burner (Natural Gas)
Spacer, Burner
Cord, Power, 5 ft.
Cord, Power, 10 ft.
Bracket, Thermostat
Stud, Pilot
Screw, Pilot
Washer
Bolt
Bolt
Thermostat with Bracket
Cover, Junction Box
Junction Box
Cover, Terminal Board
Base, Terminal Board
Screw, Burner
Switch, High Limit
Washer
Chamber, Heat
Case Assembly
Panel, Case, Burner End
Panel, Case, Motor End
Motor
Mount, Motor
Switch, Air Proving
Flapper
Fan, Wheel
Housing with Air Proving Switch and Flapper
Base
Sediment Trap
For replacement control valve, order conversion kit part #500-03398.
Part #320-03453 is used for LP and Natural Gas on K design heaters.
Specify fuel gas type when ordering.
Not Applicable.
FASTENER SELECTION TABLE
DESCRIPTION
APPLICATION
Screw, # 8 x 3/8
Case Assembly
9.1-8
8
PART NO.
130-07288
E
X
X
X
X
X
X
X
X
X
(1)
N/A
N/A
X
X
X
X
X
X
N/A
N/A
N/A
N/A
N/A
N/A
X
X
N/A
X
X
X
X
N/A
X
X
N/A
X
X
X
X
X
X
N/A
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
N/A
N/A
X
N/A
X
X
Design Sequence
F
G
H
J
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(1)
X
X
X
N/A N/A N/A N/A
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
N/A N/A N/A N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
X
X
N/A
X
X
X
N/A
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
K
X
X
X
X
X
X
X
X
X
N/A
X
X
N/A
N/A
N/A
N/A
N/A
N/A
X
X
X
X
X
X
X
N/A
X
X
X
X
X
X
N/A
N/A
X
(2)
N/A
X
X
X
X
X
X
X
N/A
X
X
X
X
N/A
N/A
X
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
Part Number
400-0
09911
550-0
06665
550-0
02736
500-0
06408
400-2
20504
310-0
02894
130-0
05548
130-0
07148
130-0
01359
500-0
02309
120-2
21839
120-2
21840
130-0
06844
130-0
01519
130-0
03114
310-0
02690
310-0
02691
310-0
02740
310-2
21573
310-2
21574
130-0
09425
130-0
07905
420-0
07826
230-0
09290
120-0
03497
550-0
03032
550-2
21380
130-0
02689
130-0
02740
130-0
02729
130-0
02741
130-0
06974
220-0
03408
420-0
03455
220-2
20264
320-0
03453
320-0
03454
130-0
02687
120-0
03438
120-0
03015
220-0
05493
130-0
07827
130-0
03070
130-0
01589
130-0
02692
130-0
07908
500-0
05568
120-0
03231
120-0
03230
500-0
02686
120-2
20171
130-0
02688
120-0
05566
130-0
02686
400-0
09241
500-0
02673(3)
271-0
07333(3)
271-0
07332
550-0
06008
220-0
03764
500-0
02680
240-0
02441
130-0
02684
500-0
05570
220-0
05570
500-0
00815
WIRE SELECTION TABLE
DESCRIPTION
Wire, Thermostat to
Terminal Board
Wire, Air Flow Switch
Wire, High Limit Switch
COLOR
Black
LENGTH
12 1/2 in.
DESIGN
All
PART NO.
430-02723
Black
Black
42 in.
25 1/4 in.
All
All
430-02724
430-03105
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
Models 408 and 410
41
42
40
39
43
38
47
37
44
33
45
36
22
32
24
46
48
31
20
23
27
34
11
10
21
26 28
25
49
12
8
15
35
1
7
19
9
6
5
16
17
18
14
7
13
4
5
29
30
1
L
RA LY
TU UPP
A
N SS
GA
2
50
3
SEDIMENT TRAP KIT
OPTIONAL ACCESSORY
August 1999
9.1-9
9
Service Parts,
Kits and Accessories
Parts Identification Guide
Model AB200
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Description
Regulator, Second Stage (LP Gas)
Regulator (Natural Gas)
Nipple, 1/2 x 3 1/2
Valve, Manual Shut-O
Off
Hose, 1/2 in. ID x 10 ft.
Adapter, Hose
Kit, Sediment Trap
Nipple, 1/2 x 1 1/2
Valve, Pilot Gas Control (LP Gas or Natural Gas)
Cap, Pilot
Manifold, Welded
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Thermocouple, 18 in.
Tube, Pilot, with Nuts
Orifice, Pilot (LP Gas)
Orifice, Pilot (Natural Gas)
Screw, Wing
Bracket, Pilot
Screw, Burner Mounting
Spacer, Burner
Shield, Pilot with Pilot Stack
Casting, Burner
Stud, Pilot Mounting
Cover, Terminal Strip
Bracket, Terminal Strip
Strip, Terminal
Cover, Terminal Board
Board, Terminal
Switch, High Limit
Chamber, Heat
Bracket, Flame Lift Off
Case Assembly
Door, Access, Right
Door, Access, Left
Hinge
Latch
Motor
Mount, Motor
Wheel, Fan
Flapper
Switch, Air Proving
Housing with Air Proving Switch and Flapper
Base
Bolt
Washer
Cord, Power
Design Sequence
A
B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N/A
X
N/A
X
N/A
X
X
N/A
X
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Part Number
550-0
06553
550-0
02736
130-0
07148
130-0
05548
400-2
20504
310-0
02894
500-0
00815
130-0
02420
500-0
02309
130-0
06844
130-0
07826
310-0
08056
310-0
08057
120-0
01090
550-0
03012
130-0
07829
130-0
06968
130-0
07484
130-0
07831
130-0
02688
130-0
02687
500-0
07864
320-0
03453
130-0
07827
220-0
08246
225-0
08245
120-0
08253
400-0
05970
120-2
20171
500-0
07887
400-0
07763
220-0
08231
400-0
08299(1)
500-0
08297(1 )
500-0
08125
130-0
05868
130-0
09073
550-2
20554
220-0
03764
130-0
02684
240-0
02441
500-0
02680
400-0
05569
225-0
07837
130-0
02692
130-0
01589
120-0
03438
(1) Specify fuel gas type and model number when ordering.
WIRE SELECTION TABLE
DESCRIPTION
Wire, Air Proving Switch
to Terminal Board
wire, High Limit Switch
Wire, Thermostat to
Terminal Board
9.1-1
10
COLOR
LENGTH
DESIGN
PART NO.
Black
Black
42 in.
25 1/4 in.
All
All
430-02724
430-03105
Black
12 1/2 in.
All
430-05263
FASTENER SELECTION TABLE
DESCRIPTION
APPLICATION
PART NO.
Screw, #8 x 3/8
Case Assembly
130-007288
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
Model AB200
33
32
31
30
34
35
37
36
44
39
38
40
1
29
28
27
18
25
17
41
L
RA LY
TU UPP
A
N SS
GA
26
21
19
20
16
2
11
15
3
9
22
14
4
8
13
23
24
10
12
5
42
43
6
7
1
August 1999
9.1-1
11
Service Parts,
Kits and Accessories
Parts Identification Guide
Model AB250
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Description
Regulator, Second Stage, Vent Over Side (LP Gas)
Regulator, Second Stage (Natural Gas)
Nipple, 3 1/2 in.
Valve, Manual Shut-O
Off
Adapter, Hose, 1/2 NPT x 1/2 NPS
Hose, 1/2 in. ID x 10 ft.
Kit, Sediment Trap
Base
Bracket, Gas Control Valve
Bolt
Valve, Gas Control (LP Gas)
Valve, Gas Control (Natural Gas)
Nipple, 1/2 in. x 1 1/2 in.
Valve, Throttle (LP Gas)
Valve, Throttle (Natural Gas)
Ell, Street
Manifold
Orifice, Burner (LP Gas)
Orifice, Burner (Natural Gas)
Gasket, Pilot
Thermocouple, 21 in.
Tubing, Pilot
Orifice, Pilot (LP Gas)
Orifice, Pilot (Natural Gas)
Cover, Pilot (Bottom)
Screw, Wing
Stud
Pilot, Bracket
Shield, with Pilot Barrel
Terminal Strip
Enclosure, Electrical
Cover, Electrical
Screw
Burner
Spacer
Switch, High Limit
Chamber, Heat
Door, Left or Right
Cord, Power
Latch
Hinge
Case Assembly
Motor
Mount, Motor
Wheel, Fan
Switch, Air Proving
Flapper (Sail)
Housing, Fan, with Flapper, Air Proving, and Motor Mount
Design Sequence
A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Part Number
550-0
06553
500-0
07087
130-0
07148
130-0
05548
510-0
02894
550-2
20704
500-0
00815
225-2
20431
225-0
09506
130-0
02692
410-2
20439
410-2
20440
130-0
02420
410-2
20143
410-2
20144
130-0
01359
420-0
09291
310-2
20141
310-2
20142
130-0
06974
120-0
03497
410-2
20436
130-0
07829
130-0
06968
225-2
20265
130-0
07484
130-0
07827
130-0
07831
500-2
20264
120-0
08253
225-2
20028
225-2
20027
130-0
02688
320-0
03453
130-0
02687
120-0
05566
400-2
20024
225-0
08629
120-2
20426
130-0
09467
430-0
05868
500-2
20434(1)
120-2
20169
225-0
08647
130-0
09050
500-0
02680
240-0
09076
500-2
20250
(1) Specify fuel gas type and model number when ordering.
NOTE: For fixed rate heater, replace items 11, 12 and 13 with a 1/2 in. elbow, part number 130-01426 and nipple, 1/2 in. x 3 1/2 in., part number 130-07148.
WIRE SELECTION TABLE
DESCRIPTION
COLOR
LENGTH
Wire, Gas Control to
Terminal Strip
White
24 in.
Wire, Air Flow Switch
to Terminal Strip
Black
45 in.
Wire, High Limit Switch
to Air Flow Switch
Black
60 in.
9.1-1
12
PART NO.
120-20423
120-20424
120-20425
DESCRIPTION
Bolt
FASTENER SELECTION TABLE
APPLICATION
Burner Mounting
PART NO.
130-02692
August 1999
Service Parts,
Kits and Accessories
Parts Identification Guide
Model AB250
33
37
36
38
40
34
35
33
39
41
42
32
43
31
30
29
7
27
26
1
24
28
16
23
15
22
14
21
20
2
25
19
10
13
5
12
18
17
11
45
4
9
August 1999
3
8
6
9.1-1
13
Service Parts,
Kits and Accessories
Kits and Accessories
This section provides part numbers for many of the more commonly requested kits and accessories used on pilot light
ignition heaters.
GAS CONVERSION KITS
Control Valves without Internal Low Pressure Regulators
and Gas Shut Offs (Control Valve Part #500-0
02309)
PART
NUMBER
500-09358
500-09360
500-09362
500-09364
500-09366
500-09359
500-09361
500-09363
500-09365
500-09367
PROPANE TO NATURAL GAS
MODEL NUMBER
DESIGN(S)
346
G, H and J
377
G, H and J
408
G, H and J
AB200
A
AS040
A
NATURAL GAS TO PROPANE
348
G, H and J
379
G, H and J
410
G, H and J
AB200
A
AS040
A
GAS CONVERSION KITS
Control Valves with Internal Low Pressure Regulators
and Gas Shut Offs
PART
NUMBER
500-21619
500-21620
500-21621
500-20650
500-21622
500-21623
500-21624
500-20652
9.2-1
1
PROPANE TO NATURAL GAS
MODEL NUMBER
DESIGN(S)
346
K
377
K
408
K
AB250
A
NATURAL GAS TO PROPANE
348
K
379
K
410
K
AB250
A
August 1999
Service Parts,
Kits and Accessories
Kits and Accessories
TEST KITS
PART
NUMBER
DESCRIPTION
550-00764
Low Gas Pressure Test Kit
550-08506
Thermocouple Test Kit
MISCELLANEOUS KITS
PART
NUMBER
500-07802
DESCRIPTION
Indoor Chain Hanging Kit
AIR DIVERTERS
MODELS
PART
NUMBER
346, 348
550-07742
AB200, 377, 379, 408, 410
550-07434
AB250
550-20048
346, 348
500-00810
AB200, 377, 379, 408, 410
500-00808
DESCRIPTION
Two Piece
(Snap-In)
One Piece
THERMOSTATS
DESCRIPTION
Remote Thermostat - Penn Stainless Steel
(Less Wiring)
Remote Thermostat - Penn Stainless Steel
w/20' Series Tap Cord
Remote Thermostat - Nema 4X
w/20' Series Tap Cord
Remote Thermostat - Nema 4X
Meets NEC Article 547 (Less Wiring)
August 1999
PART
NUMBER
500-06537
500-00831
500-09454
500-09381
9.2-2
2
Warranty
Guidelines
Equipment and Parts
EQUIPMENT
L.B. White Co., Inc. warrants that the component parts of its
heater are free from defects in material and workmanship,
when properly installed, operated, and maintained in
accordance with the Installation and Maintenance
Instructions, safety guides and labels contained with each
unit. If, within 12 months from the date of purchase by the
end user, any component is found to be defective, L.B. White
Co., Inc. will at its option, repair or replace the defective part
or heater, with a new part or heater, F.O.B., Onalaska,
Wisconsin.
A warranty card on file at L.B. White will automatically qualify
a unit and its component parts for warranty consideration. If
a warranty card is not on file, a copy of the bill of sale will be
required to establish warranty qualification. If neither is
available, the warranty period will be 12 months from date of
shipment from L B. White.
PARTS
L.B. White Co., Inc. warrants that replacement parts
purchased from the company and used on the appropriate
L.B. White heaters are free from defects both in material and
workmanship for 12 months from the date of purchase by
the end user. Warranty is automatic if a component is found
defective within 12 months of the date code marked on the
part. If the defect occurs more than 12 months later than
the date code but within 12 months from the date of
purchase by the end user, a copy of a bill of sale will be
required to establish warranty qualification.
The warranty set forth above is the exclusive warranty
provided by L.B. White, and all other warranties, including
any implied warranties or merchantability or fitness for a
particular purpose, are expressly disclaimed. In the event
any implied warranty is not hereby effectively disclaimed due
to operation of law, such implied warranty is limited in
duration to the duration of the applicable warranty stated
above. The remedies set forth above are the sole and
exclusive remedies available hereunder. L.B. White will not
be liable for any incidental or consequential damages
directly or indirectly related to the sale, handling or use of
the heater, and in any event L.B. White's liability in
connection with the heater, including for claims based on
negligence or strict liability, is limited to the purchase price.
Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above
limitation or exclusion may not apply to you. This warranty
gives you specific legal rights, and you may also have other
rights which vary from state to state.
REPLACEMENT PARTS AND SERVICE
Contact your local L.B. White dealer for replacement parts
and service or call the L.B. White Co., Inc. at
1-800-345-7200 for assistance. Be sure that you have your
August 1999
heater model number and configuration number when
calling.
10.1-1
1
Warranty
Guidelines
Warranty Returns
Warranty Returns
To complement L.B. White’s warranty, the following has been
written to simplify the warranty return policy. Our goal is to
process warranty returns and issue the appropriate credit to
you as promptly as possible. Your cooperation in following
the procedures listed below will help us achieve our goal.
1. Units and Sub-Assemblies
A. Defective heaters and sub-assemblies may be
returned to L.B. White by authorized L. B. White
service dealers by obtaining factory approval and a
Return Authorization Number prior to any return
shipment. The following information must be
supplied when requesting a Return Authorization
Number:
1. Complete heater model and serial number
2. Customer's name and address
3. Date sold
4. Date installed
5. Date failed
6. Probable cause of equipment failure
B. The Return Authorization Number must be shown
on all transmitting paperwork and marked on the
outside of the merchandise return carton. A
warranty card on file at L.B. White will
automatically qualify the unit, sub-assembly, or
component for a 12-month warranty from date of
purchase if the material being returned is found
defective. Items must be returned freight
PREPAID.
2. Parts
Authorized L.B. White service dealers can return
defective service parts, qualified for warranty under
the L.B. White Warranty Policy, as follows:
A. By using L.B. White Material Return Tags. Prior
factory approval is not required in this case. A
Material Return Tag must be filled out completely
and attached to each defective part being
returned. Material Return Tags are available from
L. B. White upon request.
B. By using the Return Authorization Number
procedure described in A. above.
All items must be returned freight PREPAID. Out of
warranty parts require factory approval and a
Return Authorization Number prior to being
returned.
3. Credit
Credit will be issued if inspection indicates:
A. The item is defective
B. The item is within the warranty period
C. Failure is due to normal use
L.B. White is not responsible for the labor cost of removal of
a defective product or part, or damages due to removal, or
expenses incurred in shipping the product or part to or from
L.B. White's plant, or the installation of the repaired or
replaced product or part.
Return of New Items for Credit
1. Factory Approval
Factory approval and a Return Authorization Number
must be obtained before any new product or part is
returned to L. B. White or credit may not be issued.
4. Item Shipped Incorrectly
If the item was shipped in error, L.B. White will
authorize shipping freight collect and rescind the 15%
restocking charge if Step 1 above is followed.
2. Freight
All items returned for credit must be shipped freight
prepaid.
5. Materials Return Tag
All parts returned to L.B. White must be accompanied
by a Materials Return Tag with the Return
Authorization Number. A separate tag is required for
each part.
3. Restocking Charge
A 15% restocking charge will apply provided the item
is new and in unused condition. Additional charges
will be made if reconditioning or new packaging is
required.
Shipping Damage
1. Parcel Post
All Parcel Post claims for damages or shortages must
be made to L.B. White within 20 days of date of
shipment.
10.2-1
1
2. Truck or United Parcel Service
Damage claims should be made by the customer
directly to the carrier or UPS.
August 1999