[
VII
Troubleshooting ]
- 11 -
HWE07170
GB
VII
Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C)
1) Thermistor characteristic graph
(2) Fan motor (CNMF)
Refer to the page on "DC fan motor (fan motor/indoor control board)."
(3) Linear expansion valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the next page for details.
Normal
Abnormal
4.3k - 9.6k
Open or short
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Thermistor R
0
= 15 k
3%
Multiplier of B = 3480 k
2%
0°C 15k
10°C 9.6k
20°C 6.3k
25°C 5.2k
30°C 4.3k
40°C 3.0k
(A) Temperature (°C)
(B) Resistance
(k )
Normal
Abnormal
1-5
2-6
3-5
4-6
Open or short
White-Red
Yellow-Brown
Orange-Red
Blue-Brown
150 k
10%
(A)
Brown
(D)
Orange
(B)
Red
(E)
Yellow
(C)
Blue
(F)
White
Rt = 15 exp { 3480(
) }
1
273+t
1
273
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
(A)
(B)
1
2
3
4
5
6
LEV
(A)
(B)
(C)
(D)
(E)
(F)
CN60
Summary of Contents for City Multi PFFY-P20VLRMM-E
Page 5: ...HWE07170 GB ...
