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Mitsubishi Electric PURY-P72 Service Handbook page 285

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[ IX Troubleshooting ]
(4) SV4a, 4b and 4d (P72 model), SV4a - 4d (P96 and P120 models)(Controls heat exchanger capacity)
1) Depending on the conditions during Cooling-only operation, at least one of the solenoid valves among SV4a through 4d turns
on. Check for proper operation on the LED and by listening for the operation sound of the solenoid valve.
2) During Heating-only operation, SV4a through 4d all turn on. Check for proper operation on the LED and by listening for the
operation sound of the solenoid valves.
3) Depending on the conditions during Cooling-main or Heating-main operation, at least one of the solenoid valves among SV4a
through 4d turns on. Check for proper operation on the LED and by listening for the operation sound of the solenoid valve.
4) The diagram on the next page shows the refrigerant flow. This diagram shows the flow of the high-temperature (high-pressure)
gas refrigerant in the Cooling-only and Cooling-main modes and the flow of the low-temperature gas/liquid refrigerant in the
Heating-only and Heating-main modes. Refer to the refrigerant circuit diagram. Solenoid valves turns on and off according to
such factors as the capacity of the indoor units in operation and outside temperature. Check the LED. Remove the SV coil,
open the lid, and check the plunger. The type of pin face wrench that is listed in the service parts list is required to perform
this task.
Refrigerant Circuit Figure (P72 model)
HWE0803A
Solenoid Valves Block
SV4a
SV4b
TH6
TH7
HEX
SV5b
CV8a
CV10a
CV9a
CV6a
CV4a
Solenoid valve block (three compartments) P72 model
SV4d
SV4b
SV4a
4
5
3
1
2
SV4d
CV7a
CV3a
CV2a
TH3
SV5c
SV4d
SV4b
SV4a
4
3
5
1
- 276 -
CV5a
BV1
ST1
BV2
2
GB
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