Carrier 38MBRQ48A-3 - Component Resistance Checks; Compressor and IPM Continuity Checks

38MBR: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Compressor Checking
Measure the resistance value of each winding by using the tester.
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.
POSITION
NOMINAL RESISTANCE VALUE
ATF310D43UMT ATQ420D1UMU
Blue - Red
0.65Ω 0.38ΩBlue - 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