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Old 07-25-2011, 08:17 PM   #1
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3 to 4 wire condensor fan wiring


I know this has been covered before but i am still having issues.

Background :

A month ago i replaced the defroster board. The outside compressor and fan would not come on. The 'contactor' would turn on and off repeatedly. if i touched one of the relays on the board it would work fine. if i let go it would turn off. i tried this numerous times with the same result. i replaced the board and it worked fine until recently.

i came home to no ac again. neither the fan nor the compressor would turn on. if i lightly tapped the condensor fan the fan turned on and the ac would work as normal. i was going to replace the fan motor but was told to try the capacitor as they fail often are much cheaper. i replaced the capacitor with a new one that grainger matched up.

the system would work until the condensor fan got hot from running and the fan would not turn on. if i lightly tapped the fan it turned on.

i bought a FASCO fan motor that matched my specs. My old motor is 3 wires and the new one is four.

THE OLD CONDENSOR FAN was wired up :

blue wire - to the F terminal on the capacitor
black wire - to the DF2 terminal on the defrost board
orange wire - to the C terminal on the capacitor

THE NEW MOTOR has 4 wires (excluding the reversing wires and green/yellow ground).
Black, White, Brown, Brown/white.


THE CAPACITOR has 3 terminals.
Herm - red wire goes to the compressor
C - yellow to the T1 contactor AND orange to the condensor fan
F - blue wire to the condensor fan


Reading online i wired it as:
Black - DF2 on the Defrost board
White - C terminal on the capacitor
Brown - to F terminal on the capacitor
Brown/white - not used

IT WORKS this way but runs backwards. It will cycle on and off as normal (i kept the thermostat at 80F so it will not run long since the pressures are higher than normal) it has run for 4 days like this.

IF i switch the reversing wires on the side of the motor FROM purple/purple & yellow/yellow TO purple/yellow & yellow/purple NEITHER the condensor fan NOR the evaporator blower motor will work(a teardrop and snowflake picture flashes). if i return them the system works fine but the condensor fan blows backwards.

Any help is apreciated. Thanks, Rich.

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Old 07-25-2011, 08:45 PM   #2
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3 to 4 wire condensor fan wiring


Sounds ok. You can get another capacitor ( small value of the dual capacitor ) and connect to Brown and Brown/White wires. Just for test.

On the Dual Capacitor ( F) will be empty

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Old 07-26-2011, 11:58 PM   #3
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3 to 4 wire condensor fan wiring


Quote:
Originally Posted by JJboy View Post
Sounds ok. You can get another capacitor ( small value of the dual capacitor ) and connect to Brown and Brown/White wires. Just for test.

On the Dual Capacitor ( F) will be empty

I hate to say it but that is greek to me

I have to run two capacitors? Is that normal?

I have googled this problem for days now and cannot get a clear cut answer or just cannot understand it. I see tons of people with this problem, i would 'think' it is a straight forward cure.
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Old 07-27-2011, 12:11 AM   #4
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3 to 4 wire condensor fan wiring


This is not a common problem
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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
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