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Old 08-31-2014, 12:14 AM   #16
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Condenser not equalizing after cycling off


txv or any other metering device, filter drier and or valves.

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Old 08-31-2014, 07:06 AM   #17
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Condenser not equalizing after cycling off


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If a system is not equalizing, is the TXV a good culprit? What else would cause this issue?
Balance port TXVs are not suppose to equalize. So swapping out a balance port TXV with another balance port TXV won't make it equalize.
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Old 09-01-2014, 11:07 PM   #18
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Condenser not equalizing after cycling off


The TXV in question is not a balanced port type... Doc, when you said valves, did you mean the compressor valves?
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Old 09-02-2014, 04:05 AM   #19
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Condenser not equalizing after cycling off


If a TXV is not a balanced port, or hard shut off TXV. Then if it is preventing the system from equalizing. The system should run in or near a vacuum on the low side when it runs.
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Old 09-05-2014, 06:05 PM   #20
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Condenser not equalizing after cycling off


It would seem odd that the valve works properly when the unit is running, but not when the unit is shut down, typically a bad valve stays bad all the time. Even the balanced port valves will typically equalize to within about 75 PSI. It would be nice to know exactly how much equalization does occur within 3-5 minutes.
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Old 09-05-2014, 08:54 PM   #21
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Condenser not equalizing after cycling off


do you mean 75 psi between high and low side?
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Old 09-05-2014, 10:04 PM   #22
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Condenser not equalizing after cycling off


Yes, 75 PSI press difference between high and low is pretty standard for older valves, newer design valves are running around 35 PSI.
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Old 09-05-2014, 10:09 PM   #23
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Condenser not equalizing after cycling off


A similar situation occurred when changing from an old orfice style coil to a new txv coil, we would sometimes have to add a hard start to get the unit to run correctly due to lack of equalization in off cycle making the unit start loaded instead of unloaded.
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Old 09-06-2014, 10:41 AM   #24
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Condenser not equalizing after cycling off


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Originally Posted by HVACDave View Post
A similar situation occurred when changing from an old orfice style coil to a new txv coil, we would sometimes have to add a hard start to get the unit to run correctly due to lack of equalization in off cycle making the unit start loaded instead of unloaded.
yep happened to me. went to a more efficient txv coil and the compressor would only start if it had about 45 minutes to sit and equalize. anything less than that and it wouldn't kick on. added a hard start kit and has been running fine for several years.

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