Trane NTXAMT A Series User Manual

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

Trane NTXAMT A Series Specifications

General

Brand	Trane
Model	NTXAMT A Series
Category	Air Conditioner
Language	English