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Thread: condencer fan question
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11-07-2012, 02:33 AM #1
condencer fan question
Hello and thanks in advance for the info....
I have a condencer fan motor trying to run when the contactor is open this contactor is a single pole so i assume that the power is feeding through. When I energize the contactor it trips the breaker instantly would i assume the compressor has a short in it or is the fan motor going out the capacitor is good and reading micro ferits that it should? Thanks again....
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11-07-2012, 06:27 AM #2
Re: condencer fan question
try disconecting the fan and check voltage through the contactor the contacts might be welded in energize with fan disconected to check the coil of contactor not faulty
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11-07-2012, 07:44 AM #3
Re: condencer fan question
Make a note of where the wires go and disconnect the compressor (power off) then turn the power back on. Sounds like you have a bad compressor and the power is earthing out through it due to the single pole contractor (assuming this is an American style unit)
Mostly found in Oxfordshire, UK :)
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11-07-2012, 07:50 AM #4
Re: condencer fan question
Neutral and live are reversed and the fan is shorted to ground. The fan is working when the contactor is open (conduction from neutral to earth), it trips when it's closed (short from live to earth).
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11-07-2012, 02:50 PM #5
Re: condencer fan question
Let me be a bit more clear for you guys. Contactor is good, cap. is good fan motor is 'trying to run' it moves at about 1/5 speed. I didnt think to disconnect the compressor then check to see if fan works correct or not. This is a 2 year old YORK 4 ton residental single phase unit and ALL wires are in the correct factory locations and the unit has not been tampered with at all. Can someoneprovide a link to correctly diag. the compressor as i looked and found nothing here im sure there is somthing I just never found it.
Thanks again fellas....
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11-07-2012, 02:51 PM #6
Re: condencer fan question
Oh the voltage is correct as well... Thanks
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11-07-2012, 03:54 PM #7
Re: condencer fan question
Live and neutral are likely to be reversed on the incoming main breaker.
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11-07-2012, 09:32 PM #8
Re: condencer fan question
Think they use two lives to these and no neutral, but only switch one live with the contactor, the other live is just on a solid link through the contactor.
Darrbaby, this is a mostly european site so your style of system and home electrical supply is not common here.
I would be checking the compressor windings for a short to ground with a megger, and testing the windings to see if they ohm out ok, if they check out ok then i'd be looking at the wires to the compressor for shorts. If they check out then test the fan motor.Last edited by monkey spanners; 11-07-2012 at 09:36 PM.
Mostly found in Oxfordshire, UK :)
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11-07-2012, 10:48 PM #9
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12-07-2012, 12:31 AM #10
Re: condencer fan question
So, It was the compressor after ohming out the windings found the short and replaced the compressor.
If this a mostley european site do you know of an american site i can browse?
Once again thanks for the help fellas.....
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12-07-2012, 05:40 PM #11
Re: condencer fan question
Mostly found in Oxfordshire, UK :)