Explanation Of Functional Parts - Toshiba Super MMU-AP0091H Service Manual

4-2. Explanation of Functional Parts

Functional part name
Solenoid valve 1. SV3A
2. SV3B
3. SV3C
4. SV3D
5. SV3E
6. SV2
7. SV4 (n)
8. SV5
4-way valve
Pulse motor valve PMV1, 2
Oil separator
Temp. sensor 1. TD1
TD2
2. TS1
3. TE1
4. TK1, TK2,
TK3, TK4
5. TL
6. TO
Pressure sensor 1. High pressure
sensor
2. Low pressure
sensor
Heater Compressor case
heater
Accumulator case
heater
Balance pipe
(Connector CN324: Red)
1) Collects oil in the oil tank during OFF time.
2) Supplies oil reserved in the oil tank during ON time.
(Connector CN313: Blue)
1) Returns oil supplied in the balance pipe to the compressor.
(Connector CN314: Black)
1) Pressurizes oil reserved in the oil tank during ON time.
(Connector CN323: White)
1) Reserves oil in the oil separator during OFF time, and supplies oil during ON time.
(Connector CN323: White)
1) Turns on during operation and balances oil between compressors.
(Hot gas bypass) (Connector CN312: White)
1) Low pressure release function
2) High pressure release function
3) Gas balance function during stop time
(Start compensation valve of compressor) (Connector CN311: Blue)
1) For gas balance start
2) High pressure release function
3) Low pressure release function
(Connector CN310: White) (for Heating model only)
1) Preventive function for high-pressure rising in heating operation
(Connector CN317: Blue)
1) Cooling/heating exchange
2) Reverse defrost
(Connector CN300, 301: White)
1) Super heat control function in heating operation
2) Liquid line shut-down function while follower unit stops
3) Under-cool adjustment function in cooling operation
1) Prevention for rapid decreasing of oil (Decreases oil flowing to the cycle)
2) Reserve function of surplus oil
(TD1: Connector, CN502: White, TD2: Connector, CN503: Pink)
1) Protection of compressor discharge temp. Used for release
(Connector CN504: White)
1) Controls super heat in heating operation
(Connector CN505: Green)
1) Controls defrost in heating operation
2) Controls outdoor fan in heating operation
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TK1 Connector CN514: Black, TK2 Connector CN515: Green,
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TK3 Connector CN516: Red, TK4 Connector CN523: Yellow
1) Judges oil level of the compressor
(Connector CN521: White)
1) Detects under cool in cooling operation
(Connector CN507: Yellow)
1) Detects outside temperature
(Connector CN501: Red)
1) Detects high pressure and controls compressor capacity
2) Detects high pressure in cooling operation, and controls the fan in low ambient
cooling operation
(Connector CN500: White)
1) Detects low pressure in cooling operation and controls compressor capacity
2) Detects low pressure in heating operation, and controls the super heat
(Compressor 1 Connector CN316: White, Compressor 2 Connector CN315: Blue)
1) Prevents liquid accumulation to compressor
(Connector CN321: Red)
1) Prevents liquid accumulation to accumulator
1) Oil balancing in each outdoor unit
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Functional outline
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