Carrier 38MGRBQ18B-3 - Compressor and IPM Checks; Compressor Check; IPM Continuity Check

38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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2. Compressor Check
Measure the resistance value of each winding by using the tester.
Fig. 48 — Compressor Check
Table 31 — Compressor Check
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.
Table 32 — IPM Continuity Check
Position
RESISTANCE VALUE
ATM150D23UFZ ATF235D22UMT ATF250D22UMT ATF310D43UMT ATQ360D1UMU ATQ420D1UMU EAPQ420D1UMUA
Blue - Red
1.72 Ω 0.75 Ω 0.75 Ω 0.65 Ω 0.37 Ω 0.38Ω 0.1ΩBlue - Black
Red - Blue
Digital tester
Normal resistance value Digital tester
Normal resistance value
(+)Red (-)Black
∞
(Several MΩ)
(+)Red (-)Black
∞
(Several MΩ)
P
NU
N
UV
VW
W(+)Red
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