Toshiba MMY-MAP0804 Series, Quick Reference

Functional outline

(Connector CN321: White)

1) Supplies oil reserved in the oil header during ON time.
(Connector CN321: White)

1) Returns oil supplied in the balance pipe to the compressor.

(Connector CN321: White)

1) Pressurizes oil reserved in the oil header during ON time.

(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.
(Connector CN322: White)

1) Turns on during operation and balances oil between compressors.

(Connector CN323: White)

1) Controls oil level balances between compressors.

(Hot gas bypass) (Connector CN311: White)

1) Low pressure release function

2) High pressure release function

3) Gas balance function during stop time
(Start compensation valve of compressor)

(SV41 Connector CN312: Blue, SV42 Connector CN312: Blue, SV43 Connector CN313: Red)

1) For gas balance start

2) High pressure release function

3) Low pressure release function

(Connector CN314: White)

1) Preventive function for high-pressure rising in heating operation

(Connector CN315: White)

1) Liquid bypass function for discharge temperature release (cooling bypass function)
(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

4) Exchange function between main and sub exchangers in cooling operation
(Connector CN303: Red)

1) Exchange function between main and sub exchangers in cooling operation

2) Preventive function for high-pressure rising in heating 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, TD3 Connector CN504: Blue)

1) Protection of compressor discharge temp.

2) Used for discharge temperature release
(Connector CN505: White)

1) Controls PMV super heat in heating operation

(Connector CN520: Green)

1) Controls defrost in heating operation

2) Controls outdoor fan in heating operation

(Connector CN521: Red)

1) Controls exchange function between main and sub exchangers
(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

(Connector CN523: 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

3) Detects under cool in indoor unit in heating 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 CN331: White, Compressor 2 Connector CN332: Blue, Compressor 3 Connector CN333: Black)

1) Prevents liquid accumulation to compressor
(Connector CN334: Red)

1) Prevents liquid accumulation to accumulator

1) Oil balancing in each outdoor unit

Functional part name

SV3A

SV3B

SV3C

SV3D

SV3E

SV3F

Solenoid valve

SV2

SV41

SV42

SV43

SV5

SV6

4-way valve

PMV1, 2

Pulse motor valve

PMV4

Oil separator

TD1

TD2

TD3

TS1

TE1

Temp. Sensor

TE2

TK1, TK2,

TK3, TK4,

TK5

TL

TO

High pressure

sensor

Pressure sensor

Low pressure

sensor

Compressor

Heater

case heater
Accumulator

case heater

Balance pipe

Explanation of Functional Parts

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