TOSHIBA
Variable Refrigerant Flow
Modular Multi
8-46hp capacity
40 indoor units
inverter control
energy efficiency
compactness
flexible design
phased installation
piping design program
performance data retrieval
.
10hp (28kW) – inverter driven
10hp (28kW) – fixed speed
8hp (22.4kW) – inverter driven
8hp (22.4kW) – fixed speed
6hp (16kW) – fixed speed
.
.
8-46hp capacity
Cooling capacity from 8hp . . . . .
13
(maximum)
8hp
Inv
connected
to …..
Cooling Connected
hp
Capacity
(nominal) (maximum)
10.8hp
22.4kw
8-46hp capacity
up to 46hp . . . . . . . .
40
(maximum)
10hp 10hp 10hp 8hp 8hp
Inv Fix Fix Fix Fix
Cooling Connected
Capacity
hp
(nominal) (maximum)
128.8kw
62.1hp
Maximum connected
horsepower?
The selected capacity of
indoor units may exceed the
horsepower of the outdoor
unit(s) by a maximum ratio of
1 to 1.35 or135%
MMS indoor unit PCB – capacity adjustment
SW08
Capacity adjustment
Capacity code
(horsepower)
SW 08
ON
ON
ON
ON
0.50
OFF
OFF
OFF
OFF
1
2
3
4
from . . . . . . .
Indoor unit
capacity
1.40kW
Capacity adjustment
Capacity code
(horsepower)
SW 08
ON
ON
ON
ON
5.00
OFF
OFF
OFF
OFF
1
2
3
4
Indoor unit
capacity
to . . . . . . .
14.00kW
Indoor unit range and capacities
2
.
15 2
MM-U56
4-way cassette
2 way cassette
1
1
MM-TU28
MM-TU42
3
MM-U80
Duct
Ceiling
Wall
Low wall
Chassis
1
MM-N28
5
MM-U140
MM-TU56
MM-SB28
Slim duct
4
MM-U112
2
.
15 2
.
15 2
2
.
15 2
3
3
3
3
3
4
4
5
5
MM-B56
MM-B80
MM-B112
MM-B140
MM-C42
MM-C56
MM-C80
MM-C112
MM-C140
MM-K42
MM-K56
MM-K80
MM-S56
MM-S80
MM-N56
MM-N80
MM-N42
Inverter control + energy efficiency
inverter speed increases and is
controlled to meet demand
100%
50%
54%
Fixed speed
. . . fixed speed
compressor
starts
Inverter
4%
Inverter
compressor starts
at 4%
. . . . and if demand is 50% or
greater runs up to full speed
(or less if demand is >50%)
if demand is still
greater than 50%
inverter slows to
4% capacity and . . .
2 in 1 compressor
Motor
terminals
Windings thermostat
terminals
Discharge
pipe
Discharge
pipe
Compressor
scroll
Fixed speed
compressor motor
Inverter
compressor motor
Oil reservoir
Crankcase heater in fixed speed
models
Inverter control + energy efficiency
Indoor unit – cooling mode
Temperature
sensors
Refrigerant
pipe
connections
Pulsed modulating
valve
Pressure
sensor
Inverter control +
PMV (Pulsed
Modulating Valve)
energy efficiency
Maintains suction superheat at 6º
Temperature sensor measures suction gas temperature
Pressure sensor measures refrigerant pressure and
converts it to saturated (evaporating) temperature
Suction gas temperature minus evaporating temperature
equals superheat
High superheat – PMV opens
Low superheat – PMV closes
Inverter control + energy efficiency
Pulsed Modulating
Valves
Fully open in
cooling mode
Modulating in
heating mode
(for superheat
control)
Outdoor
unit –
heating
mode
Compact
Typical 30hp
installation
Actual
footprint = 2.38m2
Total weight
270 x 3 = 810kgs
(incl. servicing
area = 4.82m2)
New bell
mouth design
Intelligent Power
Drive Unit (IPDU)
2 in 1 Compressor
System maintenance
slider
New fan design
4 way air inlet
design
Separate housing
for coil and
mechanical
assemblies
Suction
accumulator
Pulsed Modulating
Valves
Noise level
at maximum speed ……….
56 db(A) 50 db(A)
42 db(A)
10m
2m
4m
……… one of the quietest VRF units
on the market
Easy to install
Single gas &
liquid pipes
Oil balance
pipe = 3/8”
T Joint
Y Joint
Sized for the
total capacity
downstream
Capped
for
future
use
Header
Flexible design
Maximum lift
between
outdoor and
indoor units
Maximum vertical
separation between
indoor units
30m
50m
(outdoor higher)
Longest single
pipe run
30m
100m
250m
Maximum total
pipe run
(outdoor lower)
Phased installation
1st. branch after outdoor units
XX
Shutoff
valves
X
X
X
X
X
X
Shutoff
valves
Note: Size pipework to
take account of future
units
Refrigeration circuits
PD
•Outdoor fan control (INV)
•Stops compressor 1 @ 384 psig
•Stops compressor 2 @ 399 psig
•Locks out system @ 406 psig
Outdoor fan
•Controlled by PD
TE
•Outdoor fan control (FIX)
•Defrost control
HP SW (both)
•Locks system @ 479 psig
PS
•Locks out system @ 3 psig
TOSHIBA
Capacity control
PMV
•Flow control through
indoor unit
SV42
•Balances prior to
compressor 2 starting
PMV3
•Evaporator bypass
•TD1/2 > 110ºC
•TS > 20ºC
SV2
•Balance during off cycle
TOSHIBA
Cooling cycle
PMV 1 & 2
•Fully open
TE
•Controls FIX outdoor
fans
PG
•Provides saturation condition for
superheat control
PD
•Controls INV outdoor
fans
Reversing valve
•De-energised
TOSHIBA
Heating cycle
PD
•INV outdoor fan control
PMV 1 & 2
•Refrigerant flow control into
evaporator
TE
•FIX outdoor fan control
Reversing valve
•Energised – except at defrost
PS
•Provides saturation condition for
superheat control
Modular Multi System – Oil Management
SV3C
Pressurises oil
management
system
TK1
Monitors flow
of discharge
vapour
TK3
Monitors oil
dilution
At the start of an oil check
a record is made of the
temperature at TK1, TK2 &
TK3 for reference
TK2 - Monitors
flow of oil
out of oil vessel
SV2 – (if in
cooling mode)
Adds hot
gas to c/case
if:
TK3 < 2ºC
Fan speed
<20%
SV3A Adds oil
to balance
pipe
Modular Multi System – Oil Management
Toshiba has developed an oil management system for its Modular
Multi outdoor units which ensures that each
compressor within the Modular Multi system operates with the
optimum oil charge thus increasing compressor reliability and
operating efficiency.
The oil management system is time-controlled. The first check is
carried out after one hour’s operation and every 30 minutes thereafter
assuming that a satisfactory oil level has been determined.
The temperatures measured by sensors TK1, TK2 and TK3 are stored
for reference
.
Modular Multi System – Oil Management
When an oil check is initiated solenoid valve SV3C is energised
(opened) for 15 seconds and hot (discharge) gas flows towards the oil
tank past sensor TK1
Solenoid valve SV3A is energised allowing oil to flow past sensor
TK2 into the compressor suction pipe.
If the temperature measured at TK2 is less than that measured at TK1
it is assumed that the oil tank (and therefore the compressor) contains
sufficient oil and the oil check is terminated.
If the temperature measured at TK2 is the same as that measured at
TK1 it is assumed that the oil tank - and therefore the compressor- is
empty.
.
Modular Multi System – Oil Management
If the tank is empty an ‘A1’ judgement is made. An ‘A0’ judgement is
made if the tank contains sufficient oil. [Refer to Page 105 of the
Service Manual for further details.]
In the case of an ‘A1’ judgement the system does not lock out but
reschedules the next oil check after 5 minutes. If, during this 10minute period the low oil level indication self-cancels, the system will
continue to operate and carry out the next oil level check after 30
minutes.
If the ‘A1’ judgement remains for a further 17 x 5 minute cycles the
system will shut down and a D7 fault code will be displayed at the
faulty outdoor unit.
.
Modular Multi System – Oil Management
Solenoid valve SV3A on the unit from which oil is to be recovered
and solenoid valve SV3B on the unit which is demanding oil are both
energised for 15 seconds allowing oil at discharge pressure to pass
from the donor unit into the suction pipe of the recipient unit.
If there is no other unit from which oil can be recovered the unit
indicating a low oil level will shut down.
.
Modular Multi
Piping Design Program
Piping Design Program
A program designed for . . . . . . . . . .
System selection
Pipework configurations
Branch kit selection
Refrigerant charge calculations
Job pricing
.
Piping Design Program
Click on the appropriate button . . . . . .
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
Piping Design Program
. . . . . . . a working example
What are the ‘rules’
for installation?
Installation rules
All pipes must be of refrigeration
quality, hard-drawn or soft copper
All copper used must be new
and previously unused
Pipes must be cut using a pipe cutter – not a
hacksaw!
Installation rules
All cut pipe lengths must be
capped after use
If in doubt over pipe quality – don’t
use it!
Installation rules
All pipework must be adequately
supported and joints not under
stress
Oxygen-free nitrogen MUST be passed
through pipework during brazing
All interconnecting pipework should be
tested to 10bar using OFN and tested for
leaks
Installation rules
Following the detection and repair of any
leaks, pressurise pipework to 30bar with OFN
Leave this pressure in the system for at least
four hours, recording the pressure and ambient
temperature at the start of the test
After at least four hours check and record
the pressure and ambient temperature and
note any pressure loss.
Installation rules
Following the detection and repair of any
leaks evacuate system to remove any remaining
moisture
After at least two hours evacuation
(depending on ambient conditions) start adding
the additional refrigerant require for the system
Ensure that the refrigerant (R407C ONLY)
is charge into the system in its liquid phase –
into the liquid line
Installation rules
Once the system pressure has equalised open the unit’s
service valves and operate the unit to draw in the
remaining charge through the unit’s suction valve.
REMEMBER – the refrigerant must be weighed
into the system and MUST be R.407C
Why must refrigerant R407C be charged as a liquid?
23% R32
25% R125
52% R134a
If charged as vapour only the high pressure refrigerant at
the top of the cylinder will be drawn into the system
TOSHIBA
Variable Refrigerant Flow