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Old 08-21-2014, 08:33 PM   #1
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Condenser not equalizing after cycling off


It is a 5 ton Carrier straight cool condenser... Unit tripped breaker... Dual cap is good, RLA are good, P/T on gauges are normal... Only thing I noticed is that the pressures are not equalizing when condenser shuts down. I'm thinking bad TXV... Any thoughts?

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Old 08-22-2014, 01:29 AM   #2
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Condenser not equalizing after cycling off


If the system is other wise working when running it should be passing vapor. The TXV should be making enough noise so that you can hear it especially when the compressor shuts down it is still equalizing for a few seconds. If not try rapping on it gently, its a long shot but it might get unstuck, Otherwise if its adjustable you'll have to mark the position exactly and try minutely adjusting it to see if you can get it working. Otherwise if it is the TXV sticking you'll have to replace it.

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Old 08-22-2014, 04:14 AM   #3
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Condenser not equalizing after cycling off


It may be a balanced port TXV. They don't equalize when the condenser shuts off.
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Old 08-22-2014, 07:06 AM   #4
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Condenser not equalizing after cycling off


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It may be a balanced port TXV. They don't equalize when the condenser shuts off.
Are there any advantages to this type? Does it cause harder compressor starting? Just curious....
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Old 08-22-2014, 01:14 PM   #5
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Condenser not equalizing after cycling off


Balanced port is less likely to hunt at low load conditions, and are often used with special charges to create "wide range" TEV's.
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Old 08-22-2014, 04:23 PM   #6
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Condenser not equalizing after cycling off


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Are there any advantages to this type? Does it cause harder compressor starting? Just curious....
They help the A/C reach its SEER rating. Single phase Recip compressors require a hard start kit when a balanced port TXV is used.
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Old 08-22-2014, 08:43 PM   #7
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Condenser not equalizing after cycling off


it is an internally equalized TXV
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Old 08-23-2014, 03:51 AM   #8
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Condenser not equalizing after cycling off


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it is an internally equalized TXV
Whether a TXV is Internally or externally equalized, has nothing to do with the system/TXV allowing the system to equalize in pressures after the system shuts off. It only helps the TXV by equalizing the pressure drop through the evap for regulating the amount of refrigerant fed to the evap. An internally equalized TXV should only be used on single row evap coils.
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Old 08-23-2014, 05:09 AM   #9
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Condenser not equalizing after cycling off


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it is an internally equalized TXV
Have you heard about the recent problems of a brownish goo clogging up TXV valves? A lot of people in the industry are still trying to figure out the cause but it's usually on units that have been installed this year and up to 3 ton.
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Old 08-23-2014, 10:20 AM   #10
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Condenser not equalizing after cycling off


if there is no anti-cycle time delay within the stat or out on the 24v going in.... the breaker is tripping against that pressure.so before the unit can equalize your getting another call for cooling....does the suction rise at all? run the unit with gaiges on it shut the condenser off and sit there and time out how long it takes for that suction to climb ....what Freon are you running?
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Old 08-23-2014, 10:31 AM   #11
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Condenser not equalizing after cycling off


its an R-22 system... Suction pressure stays at around 70 and head pressure stays around 250 after shutdown... The pressures stay this way for a long while after cycling off
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Old 08-23-2014, 09:39 PM   #12
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Condenser not equalizing after cycling off


you need to shut the condenser OFF and see how long it takes to somewhat balance out to around 150psi and the unit cools the house to setpoint
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Old 08-23-2014, 10:04 PM   #13
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Condenser not equalizing after cycling off


Beenthere would a time delay be the best solution to the problem?
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Old 08-24-2014, 06:29 AM   #14
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Condenser not equalizing after cycling off


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Beenthere would a time delay be the best solution to the problem?
If it doesn't have one now, or have a thermostat with a delay. Then adding one would help a little. You will probably need to install a hard start kit on it.
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Old 08-30-2014, 11:54 PM   #15
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Condenser not equalizing after cycling off


If a system is not equalizing, is the TXV a good culprit? What else would cause this issue?

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