Mitsubishi Electric MXZ-2B30VA Service Manual page 74

11-5. TROUBLE CRITERION OF MAIN PARTS
MXZ-2B30VA MXZ-2B40VA MXZ-2B52VA MXZ-3B54VA MXZ-3B68VA MXZ-4B71VA
MXZ-4B80VA MXZ-5B100VA
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
WHT
RED BLK
2 3
1
W
V
U
MXZ-3B/4B/5B
MXZ-2B
R.V. coil
Linear expansion valve
WHT
LEV
RED
ORN
YLW BLU
High pressure switch (HPS)
MXZ-3B68/4B71/4B80/5B100VA
OBH554D
Measure the resistance with a tester.
Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board," 2. "Outdoor
electronic control P.C. board," or 5. "Outdoor Power board", for the chart of thermis-
tor.
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.
Measure the resistance between terminals using a tester.
(Winding temperature : -10°C ~ 40°C)
MXZ-2B30VA
MXZ-2B40VA
1.49 ~ 1.84
Measure the resistance between lead wires using a tester.
(Part temperature : -10°C ~ 40°C)
RED
U (W)
WHT
(V)
V
BLK
W (U) MXZ-2B
12 ~ 16
Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C)
MXZ-3B54VA
MXZ-3B68VA
MXZ-4B71VA
1.26 k ~ 1.62 k
Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C)
Color of lead wire
WHT - RED
RED - ORN
YLW - RED
RED - BLU
HPS
Check method and criterion
Normal (Each phase)
MXZ-2B52VA
MXZ-3B54VA
0.86 ~ 1.06
Normal (Each phase)
MXZ-3B/4B/5B
13.4 ~ 16.4
Normal (Each phase)
Normal
37.4
Pressure
3.7 0.15 MPa
+ 0.05
4.8
- 0.1
74
MXZ-3B68VA
MXZ-5B100VA
MXZ-4B71VA
1.29
0.63 ~ 0.78
Other models
1.2 k ~ 1.56 k
~ 53.9
Normal
Close
MPa Open
MXZ-4B80VA
~ 1.49