COMFORT-AIRE Century VMH-SV Series Service Manual page 137

Index:
1. IPM Continuity Check
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
1. Turn off outdoor unit and disconnect power supply.
2. Discharge electrolytic capacitors and ensure all energy-storage unit has been discharged.
3. Disassemble outdoor PCB or disassemble IPM board.
4. Measure the resistance value between P and U(V, W, N); U(V, W) and N.
Digital tester
(+)Red (-)Black
N
U
P
V
W
Resistance value
∞
(Several MΩ)
 Troubleshooting
Troubleshooting
Digital tester
(+)Red (-)Black
U
V
N
W
-

Resistance value
∞
(Several MΩ)