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Old 11-14-2007, 05:39 PM  
GWS
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Default Lennox A/C condensor fan motor

I am new to forum. I have a Lennox model # HS26-036-2P whole house A/C unit. The fan motor in the outside condensor,
(Emerson motor Part # 65G6001) will only run if I give the fan blade a little push than it seems to run OK. Does this sound like the motor is going bad or is there a starter type relay or something else that could cause this. thanks in advance

GWS



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Old 11-15-2007, 09:49 AM  
glennjanie
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Welcome GWS:
The problem may be the capicitor on the motor. It would be a 1' X 3"~ piece on the motor housing or off to the side. It changes the wave pattern and boosts the power for the start.
To test it, you need to remove it from the circut; turn the power off at the outdoor disconnect and seperate the two wires that are connected to the capicitor. Use an audible signal OHMmeter to contact the two leads to the capicitor; it should come in with a loud, high whistle and taper off quickly to nothing. High to low in 1 to 3 seconds means the capicitor is good. No whistle means it is bad and needs to be replaced.
If the capacitor tests 'good' then the motor is failing and should be replaced; the capicitor should be replaced along with the motor just to keep from having to go through all that again in another year.
Glenn



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Old 11-21-2007, 10:25 AM  
GWS
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Thank you Glenn I will try that

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Old 11-29-2007, 07:10 AM  
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Hi Glenn, I put in new condensor fan motor and new capacitor the fan came on, but it only ran for about an hour and shut off again. The inside fan blows cold air through the hous but the outside condensor fan won't start again.
ANy suggestions as to what to try next?

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Old 11-29-2007, 07:15 AM  
GWS
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Default Lennox condensor fan

Quote:
Originally Posted by glennjanie View Post
Welcome GWS:
The problem may be the capicitor on the motor. It would be a 1' X 3"~ piece on the motor housing or off to the side. It changes the wave pattern and boosts the power for the start.
To test it, you need to remove it from the circut; turn the power off at the outdoor disconnect and seperate the two wires that are connected to the capicitor. Use an audible signal OHMmeter to contact the two leads to the capicitor; it should come in with a loud, high whistle and taper off quickly to nothing. High to low in 1 to 3 seconds means the capicitor is good. No whistle means it is bad and needs to be replaced.
If the capacitor tests 'good' then the motor is failing and should be replaced; the capicitor should be replaced along with the motor just to keep from having to go through all that again in another year.
Glenn
Sorry Glenn I am new at forums and may have asked you new question more than once. > I put in new condensor fan and capacitor, fan came on but only ran about an hour and shut off. The inside fan blows cold air through registers but the outside condensor fan doesn't come on. Any suggestions?

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Old 11-29-2007, 09:10 AM  
glennjanie
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Hello GWS:
Evidently you have power to the unit and with the new fan and motor, you have only to look at the control wiring. Does the compressor come on without the condenser fan? If not, check the transformer which is fed by larger wires of 240v and on the output side where the small wires are should measure 24v. Once you eliminate the transformer, check to see if the 24v is getting to the outside unit. Then, finally, it is possible the thermostat is bad.
Glenn

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Old 11-29-2007, 11:43 AM  
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GWS

It may also be a good idea to verify the VA or load voltage rating on the transformer. If it is too low, this could be the cause of your woes.

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Old 11-30-2007, 08:04 AM  
GWS
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I checkrd transformer it seems to be OK. I was looking at outside unit this am. I used a wooden dowl rod and pushed the contact points together and the compressor and fan came on and ran until I released pressure on points. I pushed what appeared to be a reset button and the unit ran for about 15 minutes. Could this contact be bad? Should I cut power, take the contact off and try to clean it's points or assume it's bad and replace it.

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Old 11-30-2007, 10:48 AM  
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-Lower the set point on the t'stat so the unit will call for cooling.
-Measure the voltage on the coil of the contactor to be sure you are getting 24VAC.
-Then puch the contactor and release it and see if it stays in. If it does thne there may be a VA porblem, where the current is not enough to pull in the contactor. I doubt verymuch that this is the issue because this normally happens on long wire runs.
-If the contactor does not not stay in then it is bad and needs to be changed.

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Old 12-01-2007, 01:31 PM  
GWS
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Thanks for all the help. So far today it's been working OK. Keeping my fingers crossed.
Thanks again
GWS



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