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Mitsubishi Electric PURY-HP72 Service Handbook page 297

R410a
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[8-9 Troubleshooting Problems with Major Components on BC Controller ]
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
Cooling only
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
HWE13080
Cooling
SVA
ON
SVB
OFF
SVC
ON
Cooling main
Pressure dif-
ferential con-
ON
trol OFF or
ON
ferential con-
OFF
OFF
Mode
Heating
Stopped
OFF
OFF
ON
OFF
OFF
OFF
Heating only
Heating main
OFF
OFF
Pressure dif-
Pressure dif-
ferential con-
trol OFF or
trol OFF or
ON
ON
and
of SVA.
pipes and
of SVB.
- 286 -
Defrost
Fan
OFF
OFF
OFF
OFF
OFF
ON
Defrost
Stopped
ON
OFF
OFF
OFF
GB

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