Original message
| green1982
 |  "Non-Condensables?"
, posted Mon 25 Aug 22:45  
I've been working on a 5 ton R-22 trane system with a txv metering device.The evap coil has been freezing up,suction pressure obviously low,head pressure was ok,subcooling dead on.I changed the txv,now same thing.I've even raised the fan speed from medium to high,still freezing.I'm racking my brain here,could it be non-condensables? Or am I missing something here?
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Replies:
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| sinead26ohara
| "Re(1):Non-Condensables?" , posted Wed 3 Sep 20:30
How is your return air? Is it possible that a blockage has occured in the return air duct?
Sinead O'Hara
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| Silvertop
| "Re(1):Non-Condensables?" , posted Wed 27 Aug 06:52
Try this site, it will tell you how to troubleshoot a TXV
http://www.virginiaair.com/formbox/Solutions%20for%20Fixing%20Common%20TXV%20Problems.pdf
One step at a time
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| Jojo98
| "Re(1):Non-Condensables?" , posted Tue 26 Aug 22:35:
Non-condensibles elevate head pressure. Outdoor air temp dictates head pressure, OAT + 30deg is a good rule of thumb. Did you weigh in the charge. A searching TXV: Check location of TXV bulb (4-5 or 8-9 o'clock) ensure entire bulb fits tightly against suction line, and is insulated. Make certain bulb is several inches downstream of ext. equalization line. If you previosly posted about mismatching SEER rated coils, then you are going to have issues. Let me know I have some data that could be helpful.
[this message was edited by Jojo98 on Tue 26 Aug 22:46] |
| Silvertop
| "Re(1):Non-Condensables?" , posted Tue 26 Aug 07:38
If you have the numbers, you need to post them. What is the super heat, discharge and suction pressure, etc..
One step at a time
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| amech
| "Re(1):Non-Condensables?" , posted Tue 26 Aug 06:07
I read nothing about changing out the drier. Did you?
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| | green1982
| "Re(2):Non-Condensables?" , posted Tue 26 Aug 18:00
No I didn't change the filter dryer.I didn't notice until after I started it up again that trane has the filter dryer installed in the condensor.But my head presssure is about 200,suction is fluctuating from 10 to 50 psi.Very strange.
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| | Trane gang
| "Re(3):Non-Condensables?" , posted Tue 2 Sep 16:46:
Definetly not non-condensables!!!!!
It sounds more like you have a restriction in your piping. What is your subcooling? what is your superheat? Trane like to stick with 10-15 degree superheat. and a subcooling of about 30 degrees.
Could be a dirty evap coil of a lack of airflow.
[this message was edited by Trane gang on Tue 2 Sep 16:48] |
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