Ipm Continuity Check; Pressure On Service Port; Heating Charts - Carrier 38MAQB12-1 Service Manual

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 (-)Black
N
U
P
V
W

Pressure on Service Port

Heating Charts

( )
ODT/IDT
° F ° C
BAR 55
BAR 65
BAR 75
( )
ODT/IDT
° F ° C
PSI 55
PSI 65
PSI 75
( )
ODT/IDT
° F ° C
MPA 55
MPA 65
MPA 75
Table 25—Digital Tester
NORMAL RESISTANCE
VALUE
∞
(Several MΩ)
Table 26—Heating Chart
57/53 47/43
(13.89/11.67) (8.33/6.11)
30.3 28.5
32.5 30.0
33.8 31.5
Table 27—Heating Chart
57/53 47/43
(13.89/11.67) (8.33/6.11)
439 413
471 435
489 457
Table 28—Heating Chart
57/53 47/43
(13.89/11.67) (8.33/6.11)
3.03 2.85
3.25 3.00
3.38 3.15
Fig. 43 – Heating Chart
DIGITAL TESTER
(+)Red (-)Black
U
V
N
W
(+)Red
37/33 27/33
(2.78/0.56) (-2.78/-5)
25.3 22.8
26.6 25.4
27.8 26.3
37/33 27/33
(2.78/0.56) (-2.78/-5)
367 330
386 368
403 381
37/33 27/33
(2.78/0.56) (-2.78/-5)
2.53 2.28
2.66 2.54
2.78 2.63
50
NORMAL RESISTANCE
VALUE
∞
(Several MΩ)
17/13
(-8.33/-10.56)
20.8
23.3
24.9
17/13
(-8.33/-10.56)
302
339
362
17/13
(-8.33/-10.56)
2.08
2.33
2.49