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Old 01-28-2011, 05:46 PM   #1
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Trane 7.5 ton heat pump - 3 phase 230 R-22


I installed a new compressor, (2) dryers and (2) check valves, purged system & vacuumed down for (2) hours. Used vacuum in system pull in new R-22 and upon start up to complete charge, compressor starts and stops continuously in 2 second intervals. Voltage checks out, system does the same thing in heating or cooling. Please help???????

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Old 01-28-2011, 10:46 PM   #2
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Trane 7.5 ton heat pump - 3 phase 230 R-22


did you use a micron gauge to know how good your vacuum was? Most likely you are tripping on high head or low pressure switch. You sure you installed the check valve in the correct direction? Is your contactor opening and closing or is the comressor shutting on and off with voltage still applied?

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Old 01-29-2011, 07:29 AM   #3
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Trane 7.5 ton heat pump - 3 phase 230 R-22


You are probably in the wrong Forum I think this one is more for homeowners your equipment is Industrial/commercial.

You might have to go back to the beginning and ask what was the original problem that caused you to do all that work. And was the original problem the same as the problem now?
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Old 01-29-2011, 08:31 AM   #4
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Trane 7.5 ton heat pump - 3 phase 230 R-22


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Originally Posted by COLDIRON View Post
You might have to go back to the beginning and ask what was the original problem that caused you to do all that work. And was the original problem the same as the problem now?
Yep, looks like the compressor killing problem is still there.

Of course. it could be that the checks were accidentally installed in the wrong direction.
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Old 01-30-2011, 06:23 PM   #5
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Trane 7.5 ton heat pump - 3 phase 230 R-22


Thanks for the replies. I am sure the check valves and driers are installed correctly. My thoughts are the compressor in shutting down on high pressure. I do not feel that the high limit switch is faulty because the compressor will start. I am leaning towards a defective reversing valve or maybe a faulty T'Stat. What do you think?
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Old 01-30-2011, 07:32 PM   #6
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Trane 7.5 ton heat pump - 3 phase 230 R-22


Neither a bad/stuck RV, or a bad thermostat will make a compressor shut down on high pressure.
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Old 01-31-2011, 06:37 AM   #7
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Trane 7.5 ton heat pump - 3 phase 230 R-22


Hey Southern you said your thoughts are it's shutting down on high pressure.

That should have been eliminated right away that is one of the easiest things to check. So here's what I would do before you spend any more time and money, call a commercial pro to help you with this equipment. Or install tattletales on the safety circuit.
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Old 01-31-2011, 06:56 AM   #8
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Trane 7.5 ton heat pump - 3 phase 230 R-22


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Old 02-01-2011, 04:17 PM   #9
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Trane 7.5 ton heat pump - 3 phase 230 R-22


Thank you for your input, now for the results:

The system was shutting down on low pressure because the vacuum was now was not enough for initial start up. After force feeding the system and weighing in 26 lbs of R-22 system ran fine after freeing up a stuck RV. Completing the task by charging using a sub cooling calculator unit is running great. Special thanks to Beenthere & ColdIron.

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