8-2. Checking Motor Capacitor
Remove the lead wires from the capacitor terminals, and then place probes on the capacitor terminals as shown in Fig. 4. Observe the deflection of the pointer, setting the resistance measuring range of the multimeter to the maximum value.
The capacitor is “good” if the pointer bounces to a great extent and then gradually returns to its original position.
The range of deflection and deflection time differ according to the capacity of the capacitor.
8-3. Checking Fan Motor Winding
Referring to the electrical diagram, disconnect fan motor connectors, and measure the resistance between each lead wire with a multimeter.
The multimeter should be set in the X1 range. If the fan motor is hot, allow a few minutes until it gets cooled down.
When the resistances between each lead wire are those listed in
Multimeter
Compressor motor capacitor
Fan motor capacitor
Fig. 4
8-4. Checking Compressor Motor Winding
Checking compressor motor winding can be done in the |
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similar manner. | Multimeter |
Remove the terminal cover of the compressor motor, |
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setting the resistance measuring range of the multimeter |
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to "X1Ω " and check the continuity between each pair out |
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of the 3 terminals as shown in Fig. 5. |
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Refer to | Compressor motor |
resistance. | coil terminal |
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Fig. 5
8-6. Checking Thermistor
(Only for heat pump model)
Unplug the 2P connector connected to PCB Ass´y and measure the resistance of the thermistor with a multimeter, which is set in the X1 kΩ range.
If the thermistor is normal, the multimeter should read approximately 15kΩ at 32˚F.
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