Mitsubishi Electric PURY-P200 Service Handbook page 168

(4) In the case of SV4a~4d [P200/P400 type] or SV4a~4d, 5a, 5b [P450-P650 type] (Heat exchanger capacity control)
1
In the case of cooling-only, one or more valves among SV4a~4c, 5a, 5b turn(s) on depending on the condition.
Check the operation by LED display and operation sound of the solenoid valve.
2
In the case of heating-only, all of SV4a~4c, 5a, 5b turn on. The operation can be checked by LED display and
operation sound of the solenoid valve.
3
In the case of cooling-main or heating-main, one or more valves among SV4a~4d, 5a, 5b turn(s) on. Check the
operation by LED display and operation sound of the solenoid valve.
4
Refrigerant flow is as shown in the figure below. In the case of cooling-only or cooling-main mode, high-tem-
perature (high-pressure) flow is shown, and in the case of heating-only or heating-main mode, low-tempera-
ture gas or liquid flow is shown. Refer to the refrigerant circuit figure. Turn on or off the solenoid valve depend-
ing on the indoor unit capacity or the outdoor temperature. Check the LED monitor. Remove the SV coil, open
the lid, and check the plunger. However, pin-face tools, which are specified in service parts list, are required.
SV4a
SV4b
SV4c
SV4d
Valve
Solenoid valve block
6
5
4
3
2
1
Refrigerant circuit figure (P200-P400type)
1
Solenoid valve block 1
SV4d
SV4b
SV4a
SV4c
2 3
TH7
HEXb1
HEXf3
TH6
4
6
HEXf2
5
HEXf1
Drier
ST14 ST15 ST16
ST17
CV9a
CV10a
CV8a
Check valve block
- 165 -
CV7a
CV5a
CV3a ST1 BV1
CV4a
CV6a
CV2a
TH5
BV2
Orifice