4. HOW TO CHECK THE PARTS
Parts name
Room temperature
thermistor (RT1) Pipe temperature
thermistor (RT2)
Fan motor (MF)
Relay connector
1 Red 1
3 | White |
| 3 |
5 Black 5
Protector
Vane motor (MV)
4Orange
5 Red | M |
2Pink
Yellow | Brown | Blue |
Connector 3 6 1
Check points
Disconnect the connector, then measure the resistance using a tester. (Surrounding temperature 50°F to 86°F)
Normal | Abnormal |
4.3k' to 9.6k' | (Refer to the thermistor) |
Open or short |
Measure the resistance between the terminals using a tester.
Motor terminal | Normal |
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or | PKH |
| Abnormal | |
Relay connector |
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18,24FL |
| 30,36FL |
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99.5'i10% |
| 62.6'i10% | Open or short | |
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103.5'i10% |
| 74.0'i10% | ||
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Opening and closing temperature of protector.
Open: 266i41°F (Fan motor OFF)
Close: 176i68°F (Fan motor ON)
Measure the resistance between the terminals using a tester. (Surrounding temperature 68°F to 86°F)
| Normal | Abnormal | |
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186 to 214' | Open or short | ||
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<Thermistor Characteristic graph>
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| Room temperature thermistor(RT1) |
| Thermistor for | |
| Pipe temperature thermistor(RT2) | |
| lower temperature | |
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Thermistor R0=15k' ± 3% | ||
Fixed number of B=3480k' ± 2% | ||
Rt=15exp { 3480( | 1 |
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| 1 | ) } | ||
273+t | 273 | |||||||
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32°F | 15k' |
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50°F | 9.6k' |
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68°F | 6.3k' |
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77°F | 5.4k' |
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86°F | 4.3k' |
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104°F | 3.0k' |
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Resistance (K")
< Thermistor for lower temperature >
50
40
30
20
10
0
Temperature (°F)
44