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Old 07-15-2012, 12:29 AM   #1
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Trane XR11 heat pump not working


I have six y/o Trane XR11 heat pump. Today, I noticed it was not running (compressor OR fan) when the tstat was on A/C. Normally, this is because the breaker was blown. This time, the breaker was not tripped. The air circulation is fine from the HVAC system.

I opened the unit and checked the voltage on both sides of the contacts (240 V). The contacts are working. In addition, they are responding the tstat controls.

So, I pulled the disconnect and waited about 20 minutes. WHen I put the disconnect back in, the compressor hums sounding like it wants to start, but then shuts down after about 5 seconds. It never runs. The fan does not spin at all, but will spin freely if I manually move it.

Question is if this is a capacitor problem, or compressor problem. Will the fan run if the compressor does not start? If so, this would appear to be a capacitor problem, as I don't think the fan and compressor both died.

(I hope the fan didn't die and then burn up the compressor -- but again, the fans seems to spin fine.)

Thanks,

Todd

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Old 07-15-2012, 06:25 AM   #2
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Trane XR11 heat pump not working


That is how they act with a dead capacitor.

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Old 07-15-2012, 09:42 AM   #3
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Trane XR11 heat pump not working


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That is how they act with a dead capacitor.
I kind of expected that.

Asking the question a different way: Would the fan start up if the capacitor was fine, and the compressor had failed?

Todd
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Old 07-15-2012, 09:58 AM   #4
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Trane XR11 heat pump not working


Do you have a dual cap or 2 separate caps in that unit?
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Old 07-15-2012, 10:02 AM   #5
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Trane XR11 heat pump not working


If the fan fails the compressor will usually drop out on thermal overload.

Many dual caps will swell up on top when they fail.


Last edited by Houston204; 07-15-2012 at 10:18 AM. Reason: spelling
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Old 07-15-2012, 10:06 AM   #6
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Trane XR11 heat pump not working


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Do you have a dual cap or 2 separate caps in that unit?
It is a dual cap. Just looked at it again, and the cap is bulged on the top. Pretty much like a dome.
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Old 07-15-2012, 10:17 AM   #7
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Trane XR11 heat pump not working


Be sure to write down the wires that connected to each post before replacing that cap.
Fan motors don't run well with 45 or 50 microfarad and compressors will not run with 5 or 7.5.

Match the voltage (370 or 440) and both uF values when replacing.
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Old 07-15-2012, 10:44 AM   #8
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Trane XR11 heat pump not working


Quote:
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Match the voltage (370 or 440) and both uF values when replacing.
Thx. It is a 440 V. 50 uF - 5 uF. Now, where to find one of those on a Sunday...
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Old 07-15-2012, 11:11 AM   #9
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Trane XR11 heat pump not working


Quote:
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Many dual caps will swell up on top when they fail.
Here is what mine looks like.
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Trane XR11 heat pump not working-bulged_cap.jpg  
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Old 07-15-2012, 12:05 PM   #10
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Trane XR11 heat pump not working


It's bad
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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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Old 07-15-2012, 12:51 PM   #11
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Trane XR11 heat pump not working


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It's bad
That was it. Found another cap from a local A/C guy, and it is up and running. 50 bones is a bit much, but what can you say on a Sunday...

The new cap is a bit smaller in diameter, so I will have to either zip-tie, or re-drill and bend the mounting bracket. For now, it has a zip tie around it to prevent it from slipping through the bracket.

Thanks,

Todd

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