Mitsubishi Electric PUZ-A18NHA2 Service Manual page 55

10-6. HOW TO CHECK THE PARTS
PUZ-A18/24/30/36/42NHA2
PUY-A12/18/24/30/36/42NHA2 PUY-A12/18/24/30/36/42NHA2-BS
Parts name
Thermistor (TH3) Disconnect the connector then measure the resistance with a tester.
<Outdoor pipe>
(At the ambient temperature 10:~30:, 50˚F~86˚F)
Thermistor (TH4)
<Discharge>
Thermistor (TH6)
<Outdoor 2-phase pipe>
Thermistor (TH7)
<Outdoor>
Thermistor (TH8)
<Heatsink>
Fan motor(MF1,MF2) Refer to next page.
Solenoid valve coil Measure the resistance between the terminals with a tester.
(At the ambient temperature 20:, 68˚F)
<Four-way valve>
(21S4)
Motor for compressor Measure the resistance between the terminals with a tester.
(Winding temperature 20:, 68˚F)
U
(MC)
V
W
Linear expansion valve
Disconnect the connector then measure the resistance with a tester.
(Winding temperature 20:, 68˚F)
(LEV-A)
For A12, 18
Red
M
1
Brown
2
Blue
3
Orange
4
Yellow
5
White
6
Linear expansion valve
Disconnect the connector then measure the resistance with a tester.
(LEV-A)
(Winding temperature 20:, 68˚F)
For A24-42
Gray
M
1
Gray - Black
2
Orange
3
Red
4
Yellow
5
Black
6
Measure the resistance between the terminals with a tester.
Solenoid valve coil
(At the ambient temperature 20:, 68˚F)
<Bypass valve>
(SV)
For A24-36 only
PUZ-A18/24/30/36/42NHA2-BS
Normal
TH4
160k"~410k"
TH3
TH6 4.3k"~9.6k"
TH7
TH8 39k"~105k"
A18-36
1500±150"
Normal
A12, 18
A24, 30, 36
0.880"
0.320"
Red - White Red - Orange
Gray - Red
Normal
1450±150"
Check points
Abnormal
Open or short
Normal
A42
2350±170"
A42
0.266"
Normal
Brown - Yellow Brown - Blue
46±4"
Normal
Gray - Yellow Gray - Orange
46±3"
Abnormal
Open or short
55
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short