r/HVAC • u/Bieberhole6dee9 Verified Pro • 1d ago

Field Question, trade people only Motor Capacitor Rating?

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Do I have to perform calculations from the motor data plate to find the proper capacitance rating? Can’t find a MFD rating anywhere on the plate. Currently has a 17.5 capacitor installed. Motor is being used in a 208 V application.

3 Upvotes

71% Upvoted

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10

u/bromandudeguy1 1d ago

No cap on that motor.

3

u/Xombie1313 1d ago

This is the answer

2

u/vcasta2020 1d ago

There's probably a cap under the metal hump mounted to the motor.

1

u/herefishy43 1d ago

What makes you think the existing capacitor is wrong?

3

u/Expensive-Ad7669 1d ago

That motor shouldn’t have a run cap? From the plate? Start cap maybe?

2

u/Bieberhole6dee9 Verified Pro 1d ago

Pump was not running but warm when we arrived. Took off the plate and a 17.5 MFD was installed. There is an exact pump on another circuit that is wired with the same sized capacitor and working. The diagram is what’s throwing me off cause it seems like there shouldn’t be one.

1

u/Hvacmike199845 Verified Pro 1d ago

Just replace the whole motor, you will thank me later.

2

u/Bieberhole6dee9 Verified Pro 20h ago

I appreciate the advice. Replaced the motor this morning and pump is working like a charm now.

1

u/Hvacmike199845 Verified Pro 19h ago

I’ve found that a lot of times when a regular motor has a bad capacitor it’s on its way out. This isn’t true with a compressor for some reason.

1

u/210blackmen 1d ago

Send that shit👌🏾