Mitsubishi City Multi PEFY-P72NMHSU-E, Техническое и сервисное руководство, Страница: 19 / 76

13 - 13 -
HWE10170 GB
[8] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
ΠRoom temperature thermistor (TH21)
ΠLiquid pipe thermistor (TH22)
ΠGas pipe thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 50°F (10°C) - 86°F (30°C))
1) Thermistor characteristic graph
(2) Fan motor
Refer to the page on "DC fan motor (fan motor/INV board)."(page 47)
(3) Linear expansion valve
Refer to the page on "LEV". ([8] 4)(page 51)
Normal Abnormal
4.3k Ω - 9.6k Ω Open or short
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
ΠRoom temperature thermistor (TH21)
ΠLiquid pipe thermistor (TH22)
ΠGas pipe thermistor (TH23)
ΠThermistor R
0
= 15 k Ω 3%
Œ Multiplier of B = 3480 k Ω 2%
32°F (0°C) 15k Ω
50°F (10°C) 9.6k Ω
68°F (20°C) 6.3k Ω
77°F (25°C) 5.2k Ω
86°F (30°C) 4.3k Ω
104°F (40°C) 3.0k Ω
(A) Temperature °F (°C)
(B) Resistance (k Ω )
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)
body.fm 13 ページ ２０１１年７月２６日 火曜日 午後２時２６分