Carrier 42HVM109303 Service Manual page 57

2.Compressor checking
Measure the resistance value of each winding by using the tester.
3.IPM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital
tester to measure the resistance between P and UVWN; UVW and N.
Digital tester
(+)Red
P
Digital tester
(+)Red (-)Black
U
V N
W
Position
Blue - Red
Blue - Black
Red - Blue
Normal resistance
value
(-)Black
N
U
(Several MΩ)
V
W
Normal resistance value
∞
(Several MΩ)
Resistance Value
DA110S1C-30FZ
0.8Ω
(20℃)
∞
57
DA130M1C-31FZ
1.77Ω
(20℃)