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3-7-4 Solenoid Valve controlling
Open / Close operation in Operation
SV No.
Function
SV1
( SVD1 )
Discharge Valve
Suction Valve
SV4 - 6 ( SVS )
Equalization Valve (Pressurization)
SV2
( SVB2 )
SV3
( SVB1 )
Equalization Valve (Decompression)
( Indication on Service Tool )
Open / Close operation in Special operation
SV No.
Function
Discharge Valve
SV1
( SVD1 )
Suction Valve
SV4 - 6 ( SVS )
SV2
( SVB2 )
Equalization Valve (Pressurization)
Equalization Valve (Decompression)
SV3
( SVB1 )
3-7-5 Refrigerant Flow
- Cooling operation -
Liquid Line
CP3
ST
CV
High Pressure
gas line
CP1
Open
SV3
Low Pressure
gas Line
- Preparation for mode changing -
EX) Cooling operation
Liquid Line
CP3
ST
CV
High Pressure
gas line
Open
CP1
SV2
SV3
Close
Low Pressure
gas Line
EEV Open
SV1
Close
Close
ST
SV2
CP2
Open
SV4
Open
SV5
Open
SV6
Heating operation
EEV Close
SV1
Close
Indoor unit Gas Pipe
ST
CP2
Close
SV4
Close
SV5
Close
SV6
Cooling / Dry mode Heating mode
Close
Open
Close
Open
Defrost
Oil Recovery
Close
Close
Open
Open
Close
Close
Open
Open
- Heating operation -
Liquid Line
High Pressure
gas line
Low Pressure
gas Line
Note:
The preparation for mode changing takes a little time ( about 6 minutes).
By changing DIP-SW (SET4-3) to ON, the time for the mode selection
controlling will be shorter ( 3 minutes).
If the mode selection control time is short, the soud of refrigerant may
be loud during cool to heat selection control process.
03-14
Fan mode / Stop
Open
Close
Open
Close
IU. Freeze
Vacuuming
Prevention
Mode
Open
Close
Open
Close
Open
Close
Open
Open
EEV Open
CP3
ST
CV
SV1
Open
Open
CP1
SV2
CP2
Close
Close
SV3
SV4
Close
SV5
Close
SV6
Close
Close
Close
Open
Compressor Stop
by protection
Close
Close
Close
Open
Indoor unit Gas Pipe
ST
- Quick Links:
- Service Manual
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Table of Contents
Troubleshooting
