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