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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22116
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I replaced the OEM condenser fan motor with a 4 wire

Customer Question

I replaced the OEM condenser fan motor with a 4 wire universal motor. The unit will run for 30min and the fan will stop, but the compressor is still running Modle # ***** plus MIA 42-13. I replace the motor with another new motor with the same results. Both capacitors, Relay, Thermostat are new. on the old motor L2 120v went to the 7.5 micro ferad cap. help me to make sure I am wired correctly.
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.

Hello,

do you have a brown and a brown with white strip hooked to its own capacitor..and then the 2 hots direct to contactor?

Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.

is the capacitor a fan only with 2 sets of terminals or a dual cap with 3 sets?

Customer: replied 1 year ago.
two sets
Expert:  BillyHvac replied 1 year ago.

and no other wires on cap...just the 2 browns?

Customer: replied 1 year ago.
on the oem the was L2 120v to the fan cap. I remove that 120v and just hooked up the Brown and Brown/White with the same results
Expert:  BillyHvac replied 1 year ago.

one hot to one side contactor other hot to opposite side....2 browns to cap? and NO other wires on cap for fan?

Expert:  BillyHvac replied 1 year ago.

ok on you motor...what are colors and I will tell you where to land..and also is rotation correct?

Customer: replied 1 year ago.
Tell me How the Universal 4 wire Motor should be hooked up to this Comfortstar MIA 42- 13 The universal motor has a Black, White, Brown Brown/White and a Green/Yellow wires.
Customer: replied 1 year ago.
You can email mail me this info to***@******.***I have a headache can need to go soon
Expert:  BillyHvac replied 1 year ago.

ok this will be quick...just tell me if you know what the contactor is?

Customer: replied 1 year ago.
the rotation is correct
Expert:  BillyHvac replied 1 year ago.

black motor wire to contactor T1 terminal

white wire to contactor T2

2 browns to cap green to cabinet ground

Customer: replied 1 year ago.
This is the way it is connected and still it will run for 30min and the fan stops running and the compressor is still running.
Expert:  BillyHvac replied 1 year ago.

does the new motor say on the side it takes a 7.5 or was that in the original?

is it a 7.5 330v 0r 7.5 440v and what is new motor rated for?

Customer: replied 1 year ago.
7.5 330v It at another location so i can't see it to double check
Customer: replied 1 year ago.
both was purchased together
Expert:  BillyHvac replied 1 year ago.

was this changed from a dual cap.

see this link and tell me if your unit

http://www.comfortstarusa.com/wp-content/plugins/download-attachments/includes/download.php?id=895

Customer: replied 1 year ago.
it was a dual cap and still a dual cap. no this not it give me an email or number I can forward a pic of the wiring dia.
Expert:  BillyHvac replied 1 year ago.

can you post it here using the attachment link at top of dialog page. I am very sorry to drag this out...I know you dont feel well. Would you like to continue later?

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