Carrier 40MBFAQ Service Manual page 37

40MBFAQ: Service Manual
IPM Continuity Check
1. Turn off the outdoor unit and disconnect the power supply.
2. Discharge the electrolytic capacitors and ensure the energy-storage unit(s) have been discharged.
3. Disassemble the outdoor PCB or disassemble the 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
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
WARNING
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
Table 11 — Digital Tester
RESISTANCE VALUE


Several M
37
DIGITAL TESTER
(+)Red (-)Black
U
V
N
W
-
RESISTANCE VALUE


Several M