How To Check The Parts; Motor For Compressor; Linear Expansion Valve; Solenoid Valve Coil - Mitsubishi Electric PUZ-A18NHA4 Service Manual

10-6. HOW TO CHECK THE PARTS

PUZ-A18/24/30/36/42NHA4
PUY-A12/18/24/30/36/42NHA4
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>
TH4, TH32
Thermistor (TH6)
<Outdoor 2-phase pipe>
Thermistor (TH7)
<Outdoor>
Thermistor (TH8)
<Heatsink>
Thermistor (TH32)
<Shell>
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)
(MC) U
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
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-A18/24/30/36/42NHA4-BS
PUY-A12/18/24/30/36/42NHA4-BS
Normal
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 - Black 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