Toshiba MMY-MUP0721FT6P-UL Service Manual page 60

Functional Part Name
(Connector CN324:WHI)
SV3D
1) Reserves oil in the oil separator during OFF time.
2) Retums oil reserved in the oil separator to the compressor during ON time.
(Connector CN324:WHI)
SV3F
1) Supplies oil in the accumulator to the compressor
2) Shuts off the liquid refrigerant from the accumlator when the compressor dilution
(SV41 connector CN324:WHI, SV42 connector CN327:BLK)
1) High/Low pressure balance
Prevention of subcool oil backflow when compressor stop, start-up compensation when starting up
2-Way
SV41
the compressor, reducing refrigerant noise when starting up heating operation.
valve
SV42 2) High pessure release function
3) Low pressure release function
4) Keep the compressor reliability when Hot Gas Bypass system (prevent dilution with oil)
5) Release capacity (Refrigerant mass bypass function in minimum cooling operation)
(Connector CN326:BRW)
SV2
1) Stir the liquid refrigerant in the accumulator
(Connector CN325:YEL)
SV5B
1) Outdoor unit freeze protection during heating with hot bypass
2) High pessure release function
(4WV1 connector CN317:ORN, 4WV2 connector CN318:PUR)
4WV1
1) Cooling/Heating change
4WV2
4-Way 2) Reverse Defrost
valve (Connector CN320:GRN)
4WV3
1) Cooling/Heating change
2) Reverse Defrost
(Connector CN300:WHI)
1) Controls superheat and subcool of the main heat exchanger
PMV1
2) Stored liquid refrigerant reduction control in low ambient cooling operation
(recovers stored liquid refrigerant in the main heat exchanger)
Pulse
(PMV2 connector CN301:WHI, PMV3 connector CN302:BLU)
Motor PMV2
1) Controls superheat and subcool of the sub heat exchanger
Valve PMV3
2) Maintains discharge pressure in low ambient cooling operation
(Connecor CN303:RED)
PMV4
1) Controls superheat and scbcool of the sub-cooling heat exchanger
2) Liquid bypass function for discharge temperature release(cooling bypass function)
1) Prevention for rapid decreasing oil (Decreases oil flowing to the cycle)
Oil Separator
2) Reserve function of excess oil
1) Accumulate liquid refrigerant and Prevention of liquid refrigerant back to the compressor
Accumulator
1) Maintaining subcool of the piping
Plate Heat exchanger
(TD1 connector CN502:WHI, TD2 connector CN380:BLK)
TD1
1) Protection of compressor discharge temperature
TD2
2) Used for dischange temperature release
TG1 (TG1 connector CN381:WHI, TG2 connector CN381:WHI, TG3 connector CN384:BLU)
TG2 1) Controls superheat of PMV in heating operation
TG3
(Connector CN381:WHI)
TE1
1) Controls the main heat exchanger defrost in heating operation
2) Controls outdoor fan in heating operation
(TE2 connector CN381:WHI, TE3 connector CN384:BLU)
TE2
1) Controls the main heat exchanger defrost in heating operation
TE3
2) Controls outdoor fan in heating operation
(Connector CN378:WHI)
TL1
1) Detects the main heat exchanger subcool in cooling operation.
Temperature
2) Use as main complement swiching during cooling operation
sensor (Connector CN378:WHI)
TL2
1) Detects subcool of the sub-cooling heat exchanger in cooling operation
2) Use as main complement swiching in cooling operation [3 way variable heat exchanger]
(Connector CN378:WHI)
TL3
1) Controls subcool of the sub-cooling heat exchanger
(Connector CN378:WHI)
TS1
1) Controls PMV superheat in heating operation
(Connector CN506:BLK)
TS2
1)Controls SV3F
(Connector CN378:WHI)
TS3
1) Controls subcool of the sub-cooling heat exchanger
(Connector CN507:YEL)
TO
1) Detects outside temperature
TK1 (TK1 connector CN502:WHI, TK2 connector CN380:BLK)
TK2 1) Judges oil level of the compressor
(Connector CN501:RED)
High
1) Detects high pressure
pressure
2) Controls outdoor fan in low ambient cooling operation
Pressure sensor
3) Detects subcool of indoor units in heating operation
sensor
Low (Connector CN500:WHI)
pressure 1) Detects low pressure
sensor 2) Controls superheat in heating operation
Compressor (Comp1 connector CN331:WHI, Comp2 connector CN322:BLU)
Heater
case heater 1)Prevents liquid refrigerant accumulation in the compressor
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