Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 333

[ IX Troubleshooting ]
-5- Check Valve Block (applicable to the PURY series only)
By turning on or off SV4a-4d, 5a, and 5b on and off, the refrigerant flows through
Valve plug A, B, and C can be removed with 3 kinds of hex wrenches.
Refrigerant Circuit Figure (P72 ~ P144 models)
Solenoid Valves Block
SV4d
SV4b
SV4a
SV4c
TH7
HEXb1
HEXf3
TH6
HEXf2
CV7a
HEXf1
ST14 ST15 ST16 ST17
CV9a CV5a
CV10a
CV4a
CV8a
CV6a
CV2a
Orifice
Check Valves Block
Refrigerant Circuit Figure (P168 ~ P234 models)
Solenoid Valves Block 2
Solenoid Valves Block 1
SV4d
SV4b
SV4a
SV4c
TH7
HEXb1
HEXf3
TH6
HEXf2
CV7a
HEXf1
ST15 ST16 ST17
ST14
CV9a
CV5a
CV10a
CV4a
CV8a
CV6a
CV2a
Orifice
Check Valves Block 1
Refrigerant flow in the cooling cycle
Check valve block 2 (P168 ~ P234 models only)
Refrigerant flow in the cooling cycle
CV3a BV1
ST1
Check valve block 1
BV2
TH5
SV5a
CV7b
SV5b
HEXb2 HEXf4
ST18 ST19
CV4b CV5b CV3b
CV2b
CV6b
Check Valves Block 2
CV3a
ST1 BV1
BV2
TH5
Refrigerant flow in the heating cycle
Check valve block 2 (P168 ~ P234 models only)
, ,
Refrigerant flow in the heating cycle
Hex wrench
High pressure (gas)
High pressure (liquid)
High pressure (gas/liquid)
- 324 -
, and . Check the LED monitor.
Check valve block 1
High pressure (gas)
High pressure (liquid)
Low pressure (gas/liquid)
Check valve block 1
Gasket
Gasket
Valve plug