Trouble Shooting - Mitsubishi Electric City Multi PEFY-P40VMH-E Technical & Service Manual

7

TROUBLE SHOOTING

7-1. How to check the parts
Parts name
Room temperature 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)
Trans
Disconnect the connector and measure the resistance using a tester.
CNT
CN3T
3T
3
1
PEFY-P40~140
Fan motor
Relay connector
Protector
Fan motor
PEFY-P200
Protector
Linear expansion
Disconnect the connector then measure the resistance valve using a tester.
valve
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Drain Pump Disconnect the connector then measure the resistance
(Drain water lift up kit) valve using a tester.
(Sorrounding temperature 20°C~30°C)
Red
1
Red
3
Drain sensor
Measure the resistance between the terminals using
(Drain water lift up kit) a tester.
3
1
Normal
4.3k ~9.6k Open or short
Ω Ω
Normal
CNT(1)-(3) App.15
CN3T(1)-(3) App.4
Measure the resistance between the terminals using a tester.
Motor terminal
or
Gray
1
Relay connector
2
Blue
3
Gray-Orange
Black
4
Orange
5
Gray-Black
Blown
6
7 Gray-Brown
Red
8
Red
Gray-Blue
9
·
250
Measure the resistance between the terminals using a tester.
Relay connector
Motor terminal
Brown
4 or
Relay connector
Red
Red-White
1
Orange
8
Orange White-Black
9
Red-Black
White
2
Brown-Gray
Gray
5
Black
Gray-Yellow
3
Yellow
6
Brown-Yellow
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Brown
150Ω
Normal
399Ω Open or short
(Refer to the thermistor characteristic graph)
0°C/6.0kΩ, 10°C/3.9kΩ
20°C/2.6kΩ, 25°C/2.2kΩ
30°C/1.8kΩ, 40°C/1.3kΩ
Check points
Abnormal
(Refer to the thermistor characteristic graph)
Abnormal
Ω
Open or short
Ω
Normal
P40· 50 P63
68.8Ω 47Ω
53.73Ω 37.29Ω 27.56Ω
59.92Ω 39.81Ω 30.64Ω
74.17Ω 49.8Ω 38.31Ω
Normal Abnormal
5Ω
5Ω
5Ω
Open or short
6.08Ω
6.08Ω
6.08Ω
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
±10%
Abnormal
P71 P80 P100·125·140
32.9Ω 33.3Ω 14.05Ω
27.1Ω 9.11Ω
28.56Ω 9.87Ω
36.82Ω 12.89Ω
Abnormal
Open or short
<Thermistor characteristic graph>
Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temperature thermistor(TH23)
Drain sensor(DS)
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480kΩ ± 2%
1
Rt=15exp { 3480(
273+t
0°C 15kΩ
50
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ 40
30°C 4.3kΩ
40°C 3.0kΩ
30
20
10
0
-20 -10 0 10 20 30 40 50
(at 20°C)
Abnormal
Open or short
(at 20°C)
1
) }
273
Temperature (°C)
14