Toshiba MMU-AP0091H service manual Defrost, Flow selector/Indoor unit Cooling thermo.-ON Others

5-6. Defrost

Header unit Follower unit

FM

FM

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

TD1
1		TK3
Compressor	(Inverter)
		TK1
SV3E		TK4

SV3A

Sensor			TE1	Sensor
			Main heat exchanger
TO				TO
		SV12	Main heat exchanger
	PMV1	PMV2
4-Way valve OFF		PMV3		4-Way valve	OFF
	Pd		SV11			Pd
TS1		SV5			TS1
	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

SVD

SVDD SVSS

SVS

SVD

SVDD SVSS

SVS

SVD

SVDD SVSS

SVS

SVD

SVDD SVSS

Indoor unit

ST

PMV

TC2

TCJ

ST

TC1

ST

PMV

TC2

TCJ

ST

TC1

ST

PMV

TC2

TCJ

ST

TC1

ST

PMV

TC2

TCJ

ST

TC1

CoolingHeating

High pressure gas or condensed liquid refrigerant

Low pressure gas refrigerant

Heating Stop

Low pressure gas refrigerant (Refrigerant recovery line)

High pressure refrigerant (Push-in circuit)

Defrost operation is carried out during all heating operation or Mainly heating, part cooling operation.

Outdoor unit

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

Flow selector/Indoor unit

Cooling thermo.-ON			Others
SVD	OFF	SVD	OFF
SVS	ON	SVS	ON
SVDD	OFF	SVDD	OFF
SVSS	ON	SVSS	ON
PMV	Control	PMV	Control
Fan	Control	Fan	Stop

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

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