Trane NTXWPH A Series Service Manual page 79

11-5. TROUBLE CRITERION OF MAIN PARTS
NTXMMX20A122AA
NTXMMX42A152AA
NTXMPH20A122AA
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor (RT68)
Discharge temperature
thermistor (RT62)
Compressor
W
RED
V
U
WHT BLK
Outdoor fan motor
R.V. coil
2-way valve solenoid coil
NTXMMX42A152AA
NTXMPH20A122AA
NTXMPH24A132AA
NTXMPH30A132AA
Linear expansion valve
WHT
RED LEV
ORN
YLW BLU
High pressure switch
(HPS)
Defrost heater
NTXMPH20A122AA
NTXMPH24A132AA
NTXMPH30A132AA
OBHT702
NTXMMX24A132AA
NTXMPH24A132AA
Measure the resistance with a tester.
Refer to 11-7. "Test point diagram and voltage", 1. "Outdoor control P.C.board",
2. "Outdoor power P.C. board", for the chart of thermistor.
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-7. "Test point diagram and voltage",1. "Outdoor control P.C. board" for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Winding temperature: 14°F - 104°F)
Normal (Each phase)
NTXMMX24A132AA NTXMMX30A132AA
NTXMMX20A122AA
NTXMMX36A142AA
0.63 kΩ - 0.78 kΩ
Measure the resistance between terminals using a tester.
(Winding temperature: 14°F - 104°F)
Normal (Each phase)
NTXMMX42A152AA
NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA
• Refer to 11-6. .
Measure the resistance using a tester. (Part temperature: 14°F - 104°F)
Normal (Each phase)
NTXMMX24A132AA NTXMMX30A132AA
NTXMMX20A122AA
NTXMMX36A142AA
1.26 kΩ - 1.62 kΩ
Measure the resistance using a tester. (Part temperature: 14°F - 104°F)
Normal (Each phase)
NTXMMX42A152AA
NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA
Measure the resistance using a tester. (Part temperature: 14°F - 104°F)
Normal
0.97 kΩ - 1.37 kΩ
Measure the resistance using a tester. (Part temperature: 14°F - 104°F)
Color of lead wire
WHT - RED
RED - ORN
YLW - RED
RED - BLU
Pressure
537 ± 22 PSIG
HPS
+ 7
696 PSIG
-
15
Measure the resistance using a tester. (Part temperature: 14°F - 104°F)
Normal
0.35 kΩ - 0.50 kΩ
NTXMMX30A132AA
NTXMPH30A132AA
Check method and criterion
0.83 Ω - 1.03 Ω
0.77 Ω - 0.95 Ω
1.20 kΩ - 1.77 kΩ
1.24 kΩ - 1.86 kΩ
Normal
37.4 Ω - 53.9 Ω
Normal
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79
NTXMMX36A142AA