Mitsubishi Electric PUHY-200YMF-B Service Handbook page 124

Solenoid Valves (SVA, SVB, SVC, SVM)
Coordination signals output from the board and solenoid valve operations.
Note 1 : (SVA, SVB, SVC)
SVA, SVB and SVC are turned on and off in accordance with operation mode.
Mode
Branch Port
SVA
SVB
SVC
(SVM)
SVM is turned on and off in accordance with operation mode.
Operation Mode Cooling-only
SVM
Note 2 : (SVA, SVB, SVC)
Measure temperature of piping on either side of SVA 1-A
Measure temperature of piping on either side of SVB 1-B
1
B
CMB-P-V-D
4) BC controller transformer
BC Controller control board
CNTR
Red White
Cooling Heating
ON OFF
OFF ON
ON OFF
Cooling-principal Heating-only Heating-principal
ON OFF
CN03
Red Red
Stopped
OFF
OFF
OFF
Defrosting
OFF OFF
(SVM)
Measure temperature at points marked "X".
B
A
A
CNTR(1)-(3) Approximately 90Ω
CN03(1)-(3) Approximately 1.7Ω
* Disconnect the connector before measurement.
–122–
Defrosting
OFF
OFF
OFF
Stopped
ON OFF
1
CMB-P-V-E
Normal
Open or shorted
Malfunction