[
VII
Troubleshooting ]
- 14 -
HWE18160
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
1-6
2-6
3-6
4-6
Open or short
White-Red
Yellow-Red
Orange-Red
Blue-Red
(150Ω)
10%
(A)
Red
(E)
Yellow
(C)
Blue
(F)
White
(D)
Orange
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
6
LEV
M
(A)
(C)
(D)
(E)
(F)
CN60
HWE18160.book 14 ページ 2019年2月18日 月曜日 午前9時59分
Summary of Contents for CITY MULTI PFFY-P20VCM-E
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