Toshiba MMU-AP0091H Explanation of Functional Parts, Functional part name Functional outline

4-2. Explanation of Functional Parts

Functional part name					Functional outline
Solenoid valve	SV3A	(Connector CN324: Red)
		Closed		: Allows oil to collect/remain in the oil tank.
		Open		: Allows oil to exit the oil tank.
	SV3B	(Connector CN313: Blue)
		Open		: Allows oil to return to the outdoor unit via the balance pipe.
	SV3C	(Connector CN314: Black)
		Open		: Pressurizes the oil tank..
	SV3D	(Connector CN323: White)
		Open		: Supplies oil to the compressor from the oil separator.
	SV3E	(Connector CN323: White)
		Open		: Turns on during operation and balances oil between compressors.
	SV2	(Hot gas bypass) (Connector CN312: White)
		1)	Low pressure release function
		2)	High pressure release function
		3)	Gas balance function during stop time
	SV4 1	(Gas balance control for compressor start-up) (Connector CN311: Blue)
	SV4 2	1)	For gas balance start
		2)	High pressure release function
		3)	Low pressure release function
	SV5	(Connector CN310: White)
		1)	Increase of No. of heating indoor units, Gas balance function in defrost time
		2)	Low-pressure balance function of discharge gas pipe during all cooling operation
	SV6	(Connector CN309: White)
		1)	Liquid bypass function for discharge temp. release (Cooling bypass circuit)
	SV11	(Connector CN322: White)
		1)	For shutdown discharge gas (During all cooling operation and defrost operation)
	SV12	(Connector CN319: White)
		1)	Flow-rate control function of refrigerant to sub heat exchanger during simultaneous operation
		2)	Flow-rate control function of refrigerant to sub heat exchanger during defrost operation
4-way valve		(Connector CN317: Blue)
		1)	Cooling/Heating selection
		2)	Reverse defrost
		3)	Main-/Sub-heat exchanger selection
Pulse motor	PMV1, 2	(Connector CN300, 301: White)
valve		1)	Super heat control function during all heating operation and mainly heating, partly cooling operation
		2)	Under-cool adjustment function during all cooling operation
		3)	Divided flow control function during mainly cooling, partly heating operation
	PMV3	(Connector CN302: Red)
		1)	For flow-rate control of sub heat exchanger during simultaneous operation
			(Control function of heating divided flow)
		2)	A function preventive high pressure up during all cooling or all heating operation
Oil separator		1)	Prevention for early drop of oil level (Decrease of flow-out of discharge oil to cycle)
		2)	Reserve function of surplus oil
Temp. sensor	TD1, TD2	(TD1: Connector CN502: White, TD2: Connector CN503: Pink)
		1)	Protection of compressor discharge temp.
		2)	Releasing of discharge temp.
	TS1	(Connector CN504: White)
		1)	Controls super heat of PMV1 and 2 during all heating operation and simultaneous operation
	TS2	(Connector CN522: Black)
		1)	Controls indoor oil recovery during all cooling operation and mainly cooling, partly heating operation
		2)	Detects overheat of cycle.
	TE	(Connector CN505: Green)
		1)	Controls defrost during all heating operation and simultaneous operation.
		2)	Controls outdoor fan during all heating operation and simultaneous operation.
	TK1, TK2,		TK1: Connector CN514: Black,		TK2: Connector CN515: Green,	
	TK3, TK4,		TK3: Connector CN516: Red,		TK4: Connector CN523:Yellow	
						
		1)	Judges oil level of compressor.
	TL	(Connector CN521: White)
		1)	Detects under-cool during all cooling operation and simultaneous operation.
	TO	(Connector CN507:Yellow)
		1)	Detects external ambient temperature.

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