Mitsubishi Electric MXZ-2HA40VF2-E1 Service Manual page 57

12-5. TROUBLESHOOTING CRITERION OF MAIN PARTS
MXZ-2HA40VF MXZ-2HA50VF
MXZ-2HA40VF2 MXZ-2HA50VF2
Part name
Defrost thermistor (RT61)
Fin temperature thermistor (RT64)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger
temperature thermistor (RT68)
Discharge temperature thermistor
(RT62)
Compressor
Outdoor fan motor
MXZ-2HA40VF/2HA50VF
Outdoor fan motor
MXZ-3HA50VF
R.V. coil
Linear expansion valve
High pressure switch (HPS)
MXZ-3HA50VF
MXZ-3HA50VF2
OBH828D
MXZ-3HA50VF
MXZ-3HA50VF2
Check method and criterion
Measure the resistance with a multimeter.
Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1.
"Inverter P.C. board", 2. "Outdoor control P.C. board " or 3.
"Outdoor power P.C. board" for the chart of thermistor.
Measure the resistance with a multimeter.
Before measurement, hold the thermistor with your hands to
warm it up.
Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1.
"Inverter P.C. board", 2. "Outdoor control P.C. board ", for the
chart of thermistor.
Measure the resistance between terminals with a multimeter.
(Winding temperature : -10°C - 40°C)
Normal (Each phase)
0.86 - 1.06
Measure the resistance between lead wires with a multimeter.
(Part temperature : -10°C - 40°C)
Normal (Each phase)
32 - 43
Refer to 12-6. .
Measure the resistance with a multimeter. (Part temperature :
-10°C - 40°C)
Normal
MXZ-2HA40VF
MXZ-2HA50VF MXZ-3HA50VF
MXZ-2HA40VF2 MXZ-3HA50VF2
MXZ-2HA50VF2
1.2 k - 1.56 k 1.26 k - 1.62 k
Measure the resistance with a multimeter. (Part temperature :
-10°C - 40°C)
Color of lead wire
WHT - RED
RED - ORN
YLW - RED
RED - BLU
Pressure
3.43 ± 0.15 MPa
HPS
4.14 ± 0.1 MPa
57
Normal
37.4 - 53.9
Normal
Close
Open
Figure
W
RED
V
U
WHT
BLK
WHT RED BLK
2 3
1
W
V
U
WHT
LEV
RED
ORN
YLW BLU