Mitsubishi Electric PURY-(E)P200 Service Handbook page 278

[ IX Troubleshooting ]
Check whether the BC board output signal corresponds with the solenoid valve operation correspond.
1) SVA, SVB, SVC
SVA, SVB, and SVC turn on or off according to the indoor unit operation mode.
Port
SVM1, SVM1b, SVM2, SVM2b
SVM1, SVM1b, SVM2, and SVM2b turn on or off according to the indoor unit operation mode.
Operation
mode
SVM1,SVM1b
SVM2,
SVM2b
2) SVA, SVB, SVC
Measure the temperature at the upstream and downstream pipes
Measure the temperature at the upstream and downstream
HWE07130
Cooling
SVA ON
SVB OFF
SVC ON
Cooling only Cooling main
Pressure dif-
ferential con-
ON
trol OFF or
ON
OFF OFF
Mode
Heating Stopped
OFF OFF
ON OFF
OFF OFF
Heating only Heating main
OFF OFF
Pressure dif- Pressure dif-
ferential con- ferential con-
trol OFF or trol OFF or
ON ON
and of SVA.
pipes and of SVA.
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Defrost Fan
OFF OFF
OFF OFF
OFF ON
Defrost Stopped
ON OFF
OFF OFF
GB