–99–
1
B
A
Cooling Heating Stopped Defrosting
SVA ON OFF OFF OFF
SVB OFF ON OFF OFF
SVC ON OFF OFF OFF
Mode
Branch port
Normal Malfunction
CNTR(1)-(3) Approximately 90Ω
Open or shorted
CN03(1)-(3) Approximately 1.7Ω
* Disconnect the connector before measurering.
CNTR CN03
BC Controller control board
Red Blue Brown Brown
4) BC controller transformer
Solenoid valves (SVA, SVB, SVC, SVM1)
Coordination signals output from the board and solenoid valve operations. *
Depending on the models, SVM is not built in.
Note 1 : (SVA, SVB, SVC)
SVA, SVB and SVC are turned on and off in accordance with operation mode.
(SVM1)
SVM is turned on and off in accordance with operation mode.
Note 2 : (SVA, SVB, SVC) (SVM1)
Measure temperature of piping on either side of SVA 1-A
Measure temperature at points marked with an “X”.
Measure temperature of piping on either side of SVB 1-B
Operation Mode Cooling-only
Cooling-principal
Heating-only
Heating-principal
Defrosting Stopped
SVM1 ON OFF OFF OFF ON OFF
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