Mitsubishi Electric CITY MULTI PEFY Series, Техническое и сервисное руководство

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[
VII
Troubleshooting ]
- 14 -
HWE1804A GB
VII Troubleshooting [1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
 Inlet air temperature thermistor (TH21)
 Liquid pipe thermistor (TH22)
 Gas pipe thermistor (TH23)
 Outdoor air temperature thermistor (TH24)
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 Ω - 9.6k Ω Open or short
(Refer to the thermistor characteristic graph below.)
 Thermistor R
0
= 15 k Ω 3%
 Multiplier of B = 3480 k Ω 2%
0°C 15k Ω
10°C 9.6k Ω
20°C 6.3k Ω
25°C 5.2k Ω
30°C 4.3k Ω
40°C 3.0k Ω
Normal Abnormal
1-6 2-6 3-6 4-6 Open or short
White-Red Yellow-Red Orange-Red Blue-Red
(150 Ω ) 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
Temperature(°C)
Resistance(k
Ω
)
1
2
3
4
6
LEV
M
(A)
(C)
(D)
(E)
(F)
CN60