Ipm Check - Lennox MPA009S4S Service Manual

ODU Model #
MLA018S4S-1P
MLA024S4S-1P
MLA018S4M-1P
MLA030S4M-1P
MLA036S4M-1P

29.2. IPM Check

Measure the resistance value of each winding by using the tester.
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 (-)Black
N
U
P
V
W
Table 15. Model / Compressor Cross-Reference
Compressor Model #
ATF235D22UMT
ATF235D22UMT
ATF310D43UMT
ATQ360D1UMU
Table 16. Normal Resistance Values
Normal Resistance Value
∞
(Several MΩ)
Figure 75. Testing
Blue - Red Blue - Black
0.75 Ω
0.75 Ω
0.65 Ω
0.37 Ω
Digital Tester
(+)Red (-)Black
U
V
N
W
(+)Red
155
Red - Blue
Normal Resistance Value
∞
(Several MΩ)