7
TROUBLE SHOOTING
7-1. How to check the parts
Parts name
Room temparature
thermistor
(TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Transformer
CNT
T
CN3T
Red
Blue
1
1
2
2
3
3
White
Blue
Linear expansion
valve
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Fan motor
PFFY-P20~50
Relay connector
VLEM-A/VLRM-A
Red
C
White
Protector
PFFY-P63
VLEM-A/VLRM-A
Relay connector
Red
C
White
Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 10°C~30°C)
Normal
4.3kΩ ~9.6kΩ
Disconnect the connector and measure the resistance using a tester.
CNT(1)-(3)
App.45Ω
CN3T(1)-(3)
Disconnect the connector then measure the resistance valve using a tester.
Refer to the next page for a detail.
(1)-(5)
(2)-(6)
White-Red
Yellow-Blown
150Ω
Measure the resistance between the terminals using a tester.
Black
4
Blue
3
Yellow
2
1
1
White
Measure the resistance between the terminals using a tester.
Black
4
Blue
3
Yellow
2
1
1
White
Check points
Abnormal
Open or short
Normal
Abnormal
Open or short
App.1Ω
Normal
(3)-(5)
(4)-(6)
Orange-Red
Blue-Brown
±10%
Motor terminal
or
Relay connector
P20,P25
Black - White
335.0
Red - Yellow
174.0
Yellow - Blue
56.8
Blue - Black
99.6
Motor terminal
Normal
or
Relay connector
Black - White
Red - Yellow
Yellow - Blue
Blue - Black
(Refer to the thermistor characteristic graph
on next page.)
Abnormal
Open or short
Normal
P32
P40
P50
294.0
114.0
101.4
150.0
80.0
60.3
52.0
30.0
15.1
78.0
42.0
29.4
Abnormal
P63
112.0
78.0
12.7
Open or short
50.8
(at 20°C)
Abnormal
Open or short
(at 20°C)
12