Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 81

Solenoid valves (SVA, SVB, SVC)
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
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
BC controller transformer
BC controller control board
CNTR
Red Blue
Cooling Heating
ON OFF
OFF ON
ON OFF
B
A
1
CN03
Brown Brown
Stopped
OFF
OFF
OFF
CNTR(1)-(3) Approximately 90Ω
CN03(1)-(3) Approximately 1.7Ω
Disconnect the connector before measurement.
–80–
Defrosting
OFF
OFF
OFF
Normal Malfunction
Open or shorted