Mitsubishi Electric PURY-P200 Service Handbook page 169

Solenoid valve block 1
6
5
4
3
2
1
Solenoid valve block 2
Pin-face tool
(5) In the case of 21S4a,21S4b (4-way switching valve)
About this 4-way valve
When not powered : The electricity runs between the oil separator exit and the heat exchanger and between the
When powered : The electricity runs between the oil separator and the gas ball valve, and between the heat
Check the LED display and the intake and the discharge temperature for the 4-way valve to check whether the
valve has no faults and the electricity runs between where and where.
Do not touch the pipe when checking the temperature, as the pipe on the oil separator side will be hot.
✻
Do not give an impact from outside, as the outer hull will be deformed leading to the malfunction of the inner
valve.
✻
21S4b is P450~P650 only
Refrigerant circuit figure (P450-P650types)
Solenoid valve
block 1
TH6
ST15
ST14
CV9a
CV8a
Check valve block 1
Tightening torque : 150 N·m
gas ball valve (BV1) and the accumulator. This circulation is for cooling.
exchanger and the accumulator. This circulation is for heating.
Solenoid valve block 2
1
SV4d
SV4b
SV4a
SV4c
3
2
4
TH7
HEXb1
HEXf3
5
6
HEXf2
CV7a
HEXf1
Drier
ST16
ST17
CV5a
CV10a
CV4a
CV6a
CV2a
Orifice
Pin-face tool
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7
SV5a
CV7b
SV5b
8 9 0
HEXb2 HEXf4
ST19
ST18
CV4b CV5b
CV2b
CV6b
Check valve block 2
CV3a
Cap
Plunger
BV1
ST1
BV2
TH5