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Phil, Mechanical Engineer
Category: Electrical
Satisfied Customers: 8769
Experience:  Retired electrical contractor, 51 years experience.
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HVAC compressor fan went bad (bearings). Found a replacement

Customer Question

Hi, HVAC compressor fan went bad (bearings). Found a replacement (Dayton) fan at Grainger. However, replacement fan has two wires to go to the start capacitor while the original (Emerson) had one wire.
They sent a read this first card with brown wire going to flat side of capacitor symbol and the brown/white going to rounded side of the capacitor symbol.
Where should I connect the brown and brown/white? Both to 'fan' on capacitor? Or, brown white to hot/black?
Submitted: 1 year ago.
Category: Electrical
Expert:  Phil replied 1 year ago.

Hello, on that motor the two browns (one brown and one brown and white stripe) go the *run capacitor... you buy that separately for the specific motor.

Expert:  Phil replied 1 year ago.

*do not use the wire that used to connect to the 'fan' terminal on the units dual capacitor... you will no longer use that side of the existing dual capacitor in this case.

Expert:  Phil replied 1 year ago.

The other two wires (not the browns) go directly to t1 and t2 on the contactor... but only IF this is not a heat pump.

Customer: replied 1 year ago.
Found diagram showing in this case for this motor the brown/white gets capped and the brown goes to the fan position on the existing dual purpose start run capacitor. Doing so, the new motor is now working great.
Expert:  Phil replied 1 year ago.

Good work!

Expert:  Phil replied 1 year ago.

except that it sounds like you are now using the original capacitor, and very often the capacitance is not sufficient for replacement motors, you should also check the amperage to make sure that your new motor is running at the correct amps and keep an eye on it to insure that is not running too hot,

If it is running high amps or hot, follow my original directions on how to wire it.

Stay in touch as needed,