Toshiba MMU-AP0091H service manual Mainly Cooling, Partly Heating Operation, Heating thermo.-ON

5-4. Mainly Cooling, Partly Heating Operation

(Cooling/heating simultaneous operation with subjective cooling operation)

Header unit Follower unit

	FM
	TE1
	Main heat exchanger
	Main heat exchanger
	SV12
PMV1	PMV2
	Operating
	for condenser
	PMV3
	SV11
	SV5
	Pd sensor
TL	SV6
	OS
	SV3D
Liquid	SV41
tank
	HP

TD1
1		TK3
Compressor	(Inverter)
		TK1
SV3E		TK4

SV3A

		FM
Sensor	TE1		Sensor
		Main heat exchanger
TO			TO
	SV12	Main heat exchanger
PMV1	PMV2
		Operating
		for condenser
4-Way valve ON	PMV3		4-Way valve ON
TS1	SV11		TS1
Pd	SV5		Pd
sensor			sensor

TS2 TS2

Pd sensor

SV2 TL SV6 SV2

OS

SV3D

	SV42	Liquid	SV41				SV42
		tank
	HP	Accumulator	HP				HP
							Accumulator
SV3C	TD2		TD1			SV3C	TD2
	2		1		TK3		2
	Compressor (Inverter)		Compressor	(Inverter)			Compressor (Inverter)
TK2					TK1	TK2
Oil tank						Oil tank
			SV3E		TK4
					SV3A
	SV3B						SV3B

Suction gas pipe

Discharge gas pipe

Liquid pipe

FS unit	SVS	SVS	SVS
	SVD	SVD	SVD
	SVDD SVSS	SVDD SVSS	SVDD SVSS

ST	ST	ST	ST	ST	ST
Indoor unit

PMV	TC1	PMV	TC1	PMV	TC1
TC2		TC2		TC2
TCJ		TCJ		TCJ

SVS

SVD

SVDD SVSS

STST

PMV	TC1
TC2
TCJ

Cooling Cooling Stop Heating

High pressure gas or condensed liquid refrigerant Low pressure gas refrigerant

Low pressure gas refrigerant (Refrigerant recovery line) High pressure refrigerant (Push-in circuit)

	Outdoor unit
4-way valve	ON	SV3A	OFF
SV4 (n)	(Note 1)	SV3B	OFF
SV5	OFF	SV3C	OFF
SV6	Control	SV3D	Control
SV11	ON	SV3E	ON
SV12	Control	PMV1, 2	Close (Note 2)
Outdoor fan	Control	PMV3	Control

		Flow selector/Indoor unit
Cooling thermo.-ON		Heating thermo.-ON			Stop
SVD	OFF	SVD	ON	SVD	OFF
SVS	ON	SVS	OFF	SVS	OFF
SVDD	OFF	SVDD	OFF	SVDD	OFF
SVSS	ON	SVSS	OFF	SVSS	ON
PMV	Control	PMV	Control	PMV	Close

(Note 1) SV4 on the stopped compressor is ON. (Note 2) May be controlled.

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