Trouble Shooting - Mitsubishi CITY MULTI PEFY Series 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[50°F~86°F])
(TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Trans Disconnect the connector and measure the resistance using a tester.
CN3T CNT
3T
3 1
Fan motor PEFY-P06·08·12
Relay connector
Protector
White
Orange
Red
Black
Brown
Yellow
Blue
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
<Thermistor characteristic graph>
11
Normal
Ω Ω
4.3k ~9.6k Open or short
Normal
CNT(1)-(3) App.15
CN3T(1)-(3) App.4
Measure the resistance between the terminals using a tester.
Motor terminal
1
or
Relay connector
2
White-Black
3
White-Brown
White-Yellow
4
White-Blue
7
5
6
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Brown
150
Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temperature thermistor(TH23)
Drain sensor(DS)
=15kΩ ± 3%
Thermistor R
0
Ω
Fixed number of B=3480k
1
Rt=15exp { 3480(
273+t 273
0˚C 32˚F 15kΩ
10˚C 50˚F 9.6kΩ
20˚C 68˚F 6.3kΩ
25˚C 77˚F 5.2kΩ
30˚C 86˚F 4.3kΩ
40˚C 104˚F 3.0kΩ
Check points
Abnormal
(Refer to the thermistor characteristic graph)
Abnormal
Ω
Open or short
Ω
·
P06 08
261 Ω
294 Ω
389 Ω
475 Ω
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
Ω ±10%
50
40
± 2% 30
1
) }
20
10
0
-20 -10 0 10 20 30 40 50 (˚C)
-4 14 32 50 68 86 104 122 [˚F]
Normal
P12
232 Ω
259 Ω
450 Ω
536 Ω
Abnormal
Open or short
Temperature
(at 20˚C[68°F])
Abnormal
Open or short