Toshiba MMY-MAP0804FT7(Z), Service Manual, Page: 61 / 333

– 61 –
Explanation of Functional Parts
Functional part name Functional outline
Solenoid valve
SV3A
(Connector CN321: White)
1) Supplies oil reserved in the oil header during ON time.
SV3B
(Connector CN321: White)
1) Returns oil supplied in the balance pipe to the compressor.
SV3C
(Connector CN321: White)
1) Pressurizes oil reserved in the oil header during ON time.
SV3E
(Connector CN322: White)
1) Turns on during operation and balances oil between compressors.
TS1
(Connector CN505: White)
1) Controls PMV1, 2 super heat in single heating / collective heating
TS2
(Connector CN506: Black)
1) Controls indoor oil recovery at single cooling, collective cooling operation
2) Detects overheat of the cycle
TE2
(Connector CN521: Red)
1) Controls flow volume of the auxiliary heat exchanger at collective operation
(Compressor 1 Connector CN331: White, Compressor 2 Connector CN332: Blue, Compressor 3 Connector CN333: Black)
1) Prevents liquid accumulation to compressor Compressor
case heater
(Connector CN334: Red)
1) Prevents liquid accumulation to accumulator
1) Oil balancing in each outdoor unit Balance pipe
Accumulator
case heater
TL
(Connector CN523: White)
1) Detects under cool at single operation / collective cooling operation
TO
(Connector CN507: Yellow)
1) Detects outside temperature
Oil separator
Temp. Sensor
Pressure sensor
Heater
1) Prevention for rapid decreasing of oil (Decreases oil flowing to the cycle)
2) Reserve function of surplus oil
SV5
(Connector CN314: White)
1) Gas balance function at defrost operation when the number of heating indoor units increased/decreased
2) Gas recovery function in the discharge gas pipes when the single cooling operation
SV6
(Connector CN315: White)
1) Liquid bypass function for discharge temperature release (cooling bypass function)
2) Refrigerant recovery function from the stopped follower unit
SV3F
(Connector CN323: White)
1) Controls oil level balances between compressors.
SV11
(Connector CN319: White)
To block discharge gas pipe (At single cooling or defrost operation)
SV14
(Connector CN336: Yellow)
1) To block the liquid line
SV2
(Connector CN311: White) Hot gas bypass
1) Low pressure release function
2) High pressure release function
3) Gas balance function during stop time
High pressure
sensor
(Connector CN501: Red)
1) Detects high pressure and controls compressor capacity
2) Detects high pressure at single operation / collective cooling operation, and controls the fan in low ambient cooling operation
3) Detects under cool in indoor unit at single operation / collective heating operation
4) Controls rps of outdoor fan at collective cooling operation
SV41
SV42
SV43
(SV41 Connector CN312: Blue, SV42 Connector CN312: Blue, SV43 Connector CN313: Red)
Start compensation valve of compressor
1) For gas balance start
2) High pressure release function
3) Low pressure release function
PMV1, 2
(Connector CN300, 301: White)
1) Super heat control function at single heating, collective heating operation
2) Under cool control function in single cooling operation
SV3D
(Connector CN322: White)
1) Reserves oil in the oil separator during OFF time.
2) Returns oil reserved in the oil separator to the compressor during ON time.
PMV4
(Connector CN303: Red)
1) Controls flow volume of the auxiliary heat exchanger at collective operation
2) Preventive function for high-pressure rising in single heating operation
TE1
(Connector CN520: Green)
1) Controls defrost in single / collective heating operation
2) Controls outdoor fan in single / collective heating operation
(TD1 Connector CN502: White, TD2 Connector CN503: Pink, TD3 Connector CN504: Blue)
1) Protection of compressor discharge temp.
TD1,TD2,TD3
(TK1 Connector CN531: Black, TK2 Connector CN532: Green, TK3 Connector CN533: Red, TK4 Connector CN534: Yellow,
TK5 Connector CN535: Red)
1) Judges oil level of the compressor TK1, TK2
TK3, TK4
TK5
(Connector CN500: White)
1) Detects low pressure at single / collective cooling operation and controls compressor capacity
2) Detects low pressure at single / collective heating operation, and controls the super heat
Low pressure
sensor
4-way valve
Pulse motor
valve
(Connector CN317:Blue)
1) Cooling/heating exchange
2) Reverse defrost
3) Exchange of main heat exchanger with auxiliary heat exchanger
AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk