Trouble Shooting - Mitsubishi Electric City Multi PEFY-P30NMHU-E-F Technical & Service Manual

7

TROUBLE SHOOTING

7-1. How to check the parts
Parts name
Liquid pipe thermistor
Disconnect the connector, then measure the resistance using a tester.
(TH22)
(Sorrounding temperature 10°C~30°C[50°F~86°F])
Gas pipe thermistor
(TH23)
Outdoor air temperature
thermistor
(TH24)
Trans Disconnect the connector and measure the resistance using a tester.
CN3T CNT
3T
3 1
·
PEFY-P30
Fan motor
Relay connector
Protector
Fan motor
PEFY-P72
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[68°F~86°F])
Red
1
Red
3
Drain sensor Measure the resistance between the terminals using
(Drain water lift up kit) a tester.
3
1
13
Normal
Ω Ω
4.3k ~9.6k Open or short
Normal
CNT(1)-(3) App.15
CN3T(1)-(3) App.4
54
Measure the resistance between the terminals using a tester. (at 20˚C[68°F])
Motor terminal
or
Relay connector
Gray
1
2
Gray-Orange
3
Black
4
Gray-Black
Orange
5
Brown
6
Gray-Brown
7
Red
8
Gray-Red
Red
9
·
96 Measure the resistance between the terminals using a tester. (at 20˚C[68°F])
Relay connector
Motor terminal
Brown or
4
Relay connector
Red-White
Red
1
Orange
8
White-Black
Orange
9
Red-Black
White
2
Brown-Gray
Gray
5
Black
3
Gray-Yellow
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
[32°F]
20˚C /2.6kΩ, 25˚C
[68°F]
30˚C /1.8kΩ, 40˚C
[86°F]
Check points
Abnormal
(Refer to the thermistor characteristic graph)
Abnormal
Ω
Open or short
Ω
Normal
PEFY-P80 PEFY-P140
76.4Ω
89.8Ω
115.2Ω
148.1Ω
Normal
PEFY-P72 PEFY-P96
19.18Ω
19.18Ω
19.18Ω
23.98Ω 22.62Ω
23.98Ω 22.62Ω
23.98Ω 22.62Ω
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
±10%
Abnormal
/3.9kΩ
[50°F]
/2.2kΩ
[77°F]
/1.3kΩ
[104°F]
Abnormal
22.8Ω
27.4Ω
Open or short
32.8Ω
67.9Ω
Abnormal
17.8Ω
17.8Ω
17.8Ω
Open or short
Abnormal
Open or short
<Thermistor characteristic graph>
Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temperature thermistor(TH23)
Drain sensor(DS)
=15kΩ ± 3%
Thermistor R
0
Fixed number of B=3480kΩ ± 2%
1
Rt=15exp { 3480(
273+t
0˚C 32˚F 15kΩ
50
10˚C 50˚F 9.6kΩ
20˚C 68˚F 6.3kΩ
40
25˚C 77˚F 5.2kΩ
30˚C 86˚F 4.3kΩ
40˚C 104˚F 3.0kΩ
30
20
10
0
-20 -10 0 10 20 30 40 50
-4 14 32 50 68 86 104 122
1
) }
273
(˚C)
[˚F]
Temperature