Trouble Shooting - Mitsubishi Electric Series PDFY Technical & Service Manual

7

TROUBLE SHOOTING

7-1. How to check the parts
Parts name
Room temparature Disconnect the connector, then measure the resistance using a tester.
thermistor
(Sorrounding temperature 10˚C~30˚C)
(TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Transformer Disconnect the connector and measure the resistance using a tester.
CNT T CN3T
Red Blue
1 1
2 2
3 3
Blue
White
Linear expansion Disconnect the connector then measure the resistance valve using a tester.
valve Refer to the next page for a detail.
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Fan motor
PDFY
Relay connector
- P20~80VM
1
Protector
PDFY
Relay connector
- P100·125VM
Red
C
White
Protector
13
Normal
4.3kΩ ~9.6kΩ Open or short
Normal
CNT(1)-(3) App.45Ω
CN3T(1)-(3) App.1Ω
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Blown
150Ω
Measure the resistance between the terminals using a tester.
Orange
1
Black
2
2
4
Gray
4
Measure the resistance between the terminals using a tester.
Orange
4
Black
4
4
Blue
2
2
Yellow
Yellow
Yellow
1
Gray
Gray
1
Gray
Check points
Abnormal
Abnormal
Open or short
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
±10%
Motor terminal
Normal
or
Relay connector
P20~P50 P63~P80
Orange-Gray 43.1Ω
Brack-Gray 53.6Ω
Motor terminal
Normal
or
Relay connector
P100
Gray-Orange 23.5Ω
Orange-Black 4.79Ω
Black-Blue 6.78Ω
Blue-Yellow 13.77Ω
Yellow-Red 29.8Ω
(Refer to the thermistor)
Abnormal
Open or short
Abnormal
40.5Ω
Open or short
53.6Ω
Abnormal
P125
16.45Ω
8.30Ω
1.454Ω
Open or short
7.94Ω
21.9Ω
(at 20˚C)
(at 20˚C)