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11-5. TROUBLE CRITERION OF MAIN PARTS
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Normal
Discharge temperature
thermistor (RT62)
Fin temperature
thermistor (RT64)
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Part name Check method and criterion
1.2 k Ω ~1.56 kΩ
Measure the resistance between terminals using a tester.
(Winding temperature: 14°F ~ 104°F)
Compressor
Measure the resistance between lead wires using a tester.
(Part temperature: 14°F ~ 104°F)
Outdoor fan motor
R.V. coil
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
13.4 Ω ~ 16.4 Ω
Normal (Each phase)
13 Ω ~ 16 Ω
MXZ-2B20NA - MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Defrost thermistor
(RT61)
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 electronic control P.C.
board”, or 3. “Outdoor power 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 electronic control P.C.
board”, for the chart of thermistor.
MXZ-2B20NA
0.86 Ω ~ 1.06 Ω 1.29 Ω ~ 1.49 Ω
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Normal (Each phase)
MXZ-2B20NA
MXZ-2B20NA -
MXZ-3B24NA
MXZ-3B30NA
MXZ-4B36NA
1
Linear expansion valve
LEV
WHT
RED
YLW
BRN
ORN
BLU
The other models
WHT - RED
RED - ORN
37.4 Ω ~ 53.9 Ω
Normal
YLW -
-BLU
Color of lead wire
MXZ-2B20NA
WHT - RED
RED - ORN
YLW - RED
RED - BLU
BRN
BRN
High pressure switch
(HPS)
MXZ-3B24NA
MXZ-3B30NA
MXZ-4B36NA
Pressure Normal
HPS
537 ± 22 PSIG
696 PSIG
Open
Close
+7
-
15
1
W
U
V
WHT
RED
BLK
U
RED
WHT
BLK
V
W
(W)
(V)
(U)
LEV
WHT
RED
YLW
ORN
BLU