Troubleshooting; How To Check The Parts - Mitsubishi Electric CITY MULTI PEFY Series Technical & Service Manual

TROUBLESHOOTING-How to check the parts

7. TROUBLESHOOTING

7-1. How to check the parts

Parts name
Room temperature
thermistor (TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Transformer
CNT
CN3T
3T
3 1
Fan motor
PEFY-P15~54
E D B
L1 L2 L3
A
M A
F P C C
Capacitor
Thermal protector
Relay connector
A...Orange
B...Blue
B F
C...Red
D...Brown
D A E
E...Black
C C
F...Gray
Linear expansion valve
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Drain Pump
(Drain water lift up kit)
Red
1
Red
3
Drain sensor
(Drain water lift up kit)
3
1
HWE1212A
Disconnect the connector, then measure the resistance using a tester.
(Sorrounding temperature 10°C~30°C [50°F~86°F])
Normal
4.3kΩ~9.6kΩ Open or short
Disconnect the connector and measure the resistance using a tester.
Normal
CNT(1)-(3) App.15Ω
CN3T(1)-(3) App.4Ω
Measure the resistance between the terminals using a tester. (at 20°C [68°F])
Motor terminal
or
PEFY-P15,18
Relay connector
M 30.9
A 46.9
L1 4.08
L2 8.95
L3 7.77
Disconnect the connector then measure the resistance valve using a tester.
(1)-(5) (2)-(6)
White-Red Yellow-Brown
200Ω ±10%
Disconnect the connector then measure
the resistance valve using a tester.
(Sorrounding temperature 20°C~30°C
[68°F~86°F])
Normal Abnormal
399Ω Open or short
Measure the resistance between the
terminals using a tester.
(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
13
Check points
Abnormal
(Refer to the <Thermistor characteristic
graph>)
Abnormal
Open or short
Normal
PEFY-P24 PEFY-P27,30
24.6 24.0
34.7 29.1
2.81 2.94
4.03 3.56
6.06 4.35
Normal
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
<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%
Rt=15exp {3480 (
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
Unit :Ω
Abnormal
PEFY-P36,48,54
6.26
8.19
0.740 Open or short
0.741
2.07
Abnormal
Open or short
1 1
− )}
273+t 273
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
-4 14 32 50 68 86 104 122
Temperature
(˚C)
[˚F]