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Old 09-12-2012, 05:58 PM   #1
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Rheem condenser fan motor constant run


So we were on vacation for a week. When we came home last Saturday I noticed the issue. This is the first time I have ever noticed my fan running when the system is not calling for cooling. The compressor does NOT run all the time with the fan, it cycles when calling for cool.

The condenser is an older model, I honestly have no idea how old. I would almost guess it is as old as the furnace which has an inspection date of 1994. I have read through multiple threads with others in this situation. I started off by replacing the contacter. The contacter did not fix my problem. I feel I am familiar enough with AC voltage so I did some measuring on the contacter. It seems as though current is back flowing somewhere through the system because the only way I can get the fan to turn off is by removing the black lead from the breaker box. Removing the white lead does nothing at all.

Thank you so much for your help
Matt

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Old 09-12-2012, 06:21 PM   #2
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Rheem condenser fan motor constant run


sounds like the winding may be partially grounded. Time for a new motor and capacitor.

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Old 09-13-2012, 07:00 AM   #3
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Rheem condenser fan motor constant run


What is the best method of determining the best fan motor and capacitor for my unit? Is there anything I should check on the two leads to the fan to determine that it is in fact the windings? Thank you.
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Old 09-13-2012, 07:11 AM   #4
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Rheem condenser fan motor constant run


is the fan spinning at full speed when off? Take the motor with you to a motor shop and or a graingers and they can get the specs off the motor.
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Old 09-13-2012, 09:35 AM   #5
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Rheem condenser fan motor constant run


For the time I was standing there trying to do some trouble shooting I noticed that the speed would change from a slow rotation to a faster rotation but never what I feel is the speed it would be when the compressor runs. Is a Grainger a place that anyone can walk into?
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Old 09-13-2012, 09:43 AM   #6
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Rheem condenser fan motor constant run


Yes..grainier is accessible to public.
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Old 09-14-2012, 05:30 AM   #7
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Rheem condenser fan motor constant run


You may need a 2 pole contactor. If the leg that feeds the capacitor is constant you may be running the fan on 120v. Check voltage to the fan if possible. I have seen 220v motors run slow when the voltage is at 110-120volt
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Old 09-14-2012, 07:02 AM   #8
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Quote:
Originally Posted by imac service View Post
You may need a 2 pole contactor. If the leg that feeds the capacitor is constant you may be running the fan on 120v. Check voltage to the fan if possible. I have seen 220v motors run slow when the voltage is at 110-120volt
Why would I need to change the contactor all of the sudden? Is it because I am being recommended to buy a new fan motor? I replaced the contactor with the same exact one I took out.
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Old 09-14-2012, 07:08 AM   #9
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Rheem condenser fan motor constant run


he is wrong.......... a 2 pole contactor will only mask the underlying problem of the motor.
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Old 09-14-2012, 07:12 AM   #10
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Rheem condenser fan motor constant run


This is a picture of my old contactor and capacitor top. I hope this might help.
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Old 09-14-2012, 08:29 AM   #11
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Rheem condenser fan motor constant run


My mistake ... removed my post

Last edited by Flt_Simulation; 09-14-2012 at 09:07 AM.
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Old 09-14-2012, 08:57 AM   #12
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Quote:
Originally Posted by Flt_Simulation View Post
Here is a problem I have with my system. I don't know if my system is like yours, but this may be of some help.
_____________________________________

I just bought a 10 year old house that has a split HVAC system (outside A/C unit with an inside air handler/electric heat unit).

The air handler is a Trane model #TWE048C14

Even though the thermostat is in the Fan Auto position, the blower in the air handler continually runs (even when the A/C compressor outside turns off)

I replaced the old Honeywell wall mounted digital thermostat with a brand new Honeywell touch screen thermostat in hopes that the new thermostat would fix this problem, but it did not. Everthing is wired correctly. In fact, even when I remove the new thermostat from the wall, the air handler blower always runs. The only way to get it to turn off is by flipping off the air handler's circuit breaker in the main circuit breaker panel.

From what I have read on various internet sites, there are many parts in most common residential air handler that may cause this problem ....

1. Sequencer

2. Fan Relay

3. Contactor

4. Circuit Board
__________________________________________

I did some more searching. It looks like this part is what usually fails in the Trane / American Standard air handlers, and causes the fan to run continually:

You may check to see if your unit uses a Fan Time Delay Relay too

Fan Time Delay Relay (replacement P/N: RLY02807)

Here is the part I ordered:
http://shortyshvac.com/index.php?mai...oducts_id=1158


BTW ... This part just came via UPS yesterday .. Hope to install it today and see if it fixes my problem

Maybe some of the info here may be of some help to you

Good luck!
This has nothing to do with the problem that the OP is having.
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Old 09-14-2012, 09:03 AM   #13
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Rheem condenser fan motor constant run


Flt I appreciate your information you provided and I am sorry you had issues with your air handler. My problem lies with the outside unit and the fan that helps draw air across the coils constantly staying on even when the compressor is not running.
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Old 09-14-2012, 09:10 AM   #14
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mferg ...

I just realized that too ... anyway, I deleted my post since it's not appropriate to your problem.

Good luck with your troubleshooting
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Old 09-14-2012, 04:14 PM   #15
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Rheem condenser fan motor constant run


Good chance the capacitor is shorting to ground. be carefull when you touch your condenser.

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