Should I replace the fan motor

Problems related to residential installations.

Should I replace the fan motor

Postby jtmcc2001 » Thu Jul 02, 2015 11:40 am

On the AC at my home the fan was not rotating though it sounded as if the unit was attempting to spin it. I replaced the run capacitor and it worked well for about 5 hours then the fan stopped spinning again as before. Should I just replace the fan motor or could I have possibly made an error on the run capacitor installation? It still sounds like something is trying to run but the fan will on spin even if I attempt to move it while turning on the AC.
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- Should I replace the fan motor

Postby LennoxHVAC » Thu Jul 02, 2015 1:38 pm

It makes sense to not blame motor entirely.
Discharging capacitor is recommended before working with it.

I will check the wires first.
Black wire from the motor is intended to fan the cooling function.

SAFETY FIRST! Turn off power to the unit before tinkering.
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- Should I replace the fan motor

Postby Freon » Thu Jul 02, 2015 1:56 pm

Is this the fan motor on the outdoor condenser unit or the blower (fan) motor on the indoor air handler?

Make and model number of the unit with the problem fan?
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- Should I replace the fan motor

Postby jtmcc2001 » Thu Jul 02, 2015 3:02 pm

The fan is on the outside unit.The make and model of the unit - 4 Ton 13 Seer R410-A Air Conditioning Condensing Unit (model # TCGD48S41S1H). Thank you for the input.
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- Should I replace the fan motor

Postby Bigbird15 » Thu Jul 02, 2015 10:42 pm

Measure the capacitor MFD with your meter and make sure it is the correct size +/-6%. Also a capacitor will blow quickly if the voltage rating is too low. For a 240VAC fan, a 440 or 470 VAC run capacitor is necessary --- actual voltages across the cap may go as high as 390VAC. If the cap is good, replace the motor and use the correct cap matched to the motor.
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- Should I replace the fan motor

Postby Freon » Mon Jul 06, 2015 1:43 pm

Many condenser units have dual capacitors... 2 capacitors in one "can". One capacitor is for the fan, the other for the compressor. You need to be sure you have the correct dual capacitor. Both microfarad values (fan and compressor) have to be the same as the old values.

Then be sure you have it wired correctly. On the top of the capacitor are imprinted letters... HERM (compressor) FAN (fan) and C (common).
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