Toshiba R410A Service Manual page 59

5-6. Defrost
TE1
SV12
PMV1 PMV2
PMV3
SV11
SV5
SV6
TL
Liquid
tank
FS unit SVD
SVDD SVSS
ST
Indoor unit
PMV
TC2
TCJ
High pressure gas or condensed liquid refrigerant
Low pressure gas refrigerant
Defrost operation is carried out during all heating operation or Mainly heating, part cooling operation.
Outdoor unit
4-way valve OFF
SV4 (n) (Note 1)
SV5 ON
SV6 Control
SV11 OFF
SV12 Close
Outdoor fan Stop (Note 2)
(Note 1) SV4 on the stopped compressor is ON.
Header unit
FM
Sensor
Main heat exchanger
TO
Main heat exchanger
OFF
4-Way valve
Pd sensor
SV2
OS
SV3D
SV41 SV42
HP HP
SV3C
TD1 TD2
TK3
TK1 TK2
Oil tank
TK4
SV3E
SV3A
SV3B
Discharge gas pipe
SVS
SVD
ST ST
PMV
TC1
TC2
TCJ
Cooling
SV3A OFF
SV3B OFF
SV3C OFF
SV3D Control
SV3E ON
PMV1, 2 Control
PMV3 Control
PMV1 PMV2
PMV3
Pd
TS1
sensor
TS2
TL
Liquid
tank
Accumulator
Suction gas pipe
Liquid pipe
SVS
SVD
SVDD SVSS
ST ST
PMV
TC1
TC2
TCJ
Heating
Low pressure gas refrigerant (Refrigerant recovery line)
High pressure refrigerant (Push-in circuit)
Cooling thermo.-ON
SVD
SVS
SVDD
SVSS
PMV
Fan
(Note 2) May be controlled.
59
Follower unit
FM
TE1
Main heat exchanger
Main heat exchanger
SV12
SV11
SV5
Pd sensor
SV6
SV2
OS
SV3D
SV41
HP
SV3C
TD1
TK3
TK1 TK2
Oil tank
TK4
SV3E
SV3A
SVS
SVD
SVDD SVSS
ST ST
PMV
TC1
TC2
TCJ
Heating
Flow selector/Indoor unit
OFF SVD
ON SVS
OFF SVDD
ON SVSS
Control PMV
Control Fan
Sensor
TO
OFF
4-Way valve
Pd
TS1
sensor
TS2
SV42
HP
Accumulator
TD2
SV3B
SVS
SVDD SVSS
ST
TC1
Stop
Others
OFF
ON
OFF
ON
Control
Stop