Original message
| tg2
 |  "help on roof top comfort unit"
, posted Sat 30 Jul 13:49:  
I m having trouble with a rooftop unit .When you turn it on the comp starts and cools for almost 90 seconds and than it stops cooling and you hear a venting sound as pressure is relieving inside.is there a internal relief valve in the comp or a bypass valve for hi pressure somewhere in the system.or is the compressor bad and leaking thru.
[this message was edited by tg2 on Sat 30 Jul 14:01] |
| Replies:
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| MasterTech
| "Re(1):help on roof top comfort unit" , posted Sat 30 Jul 16:54
Yes. its in the compressor. If it goes off it means that the head pressure is too high for some reason. Reason are over charged, bad fan motor, restriction and so on.
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| | tg2
| "Re(2):help on roof top comfort unit" , posted Sat 30 Jul 18:30:
its not over charged and the fan is working and the coils are clean ,do you have anymore suggestions to check.what else causes this ? thanks for you response
[this message was edited by tg2 on Sat 30 Jul 18:30] |
| | Xenos
Webmaster 
| "Re(3):help on roof top comfort unit" , posted Sun 31 Jul 11:02
What is the head pressure?
Xenos.
The best way to escape a problem is to solve it.
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| | MasterTech
| "Re(3):help on roof top comfort unit" , posted Sat 30 Jul 19:35
Then you have either a restriction or a bad high pressure bypass.
What type of sub cool and super heat do you get. Can you get pressures right off the compressor?
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| | freon john
| "Re(4):help on roof top comfort unit" , posted Sat 30 Jul 20:58
internal presuure reliefs have been know to go bad and relieve at a lower pressure. what kind of pressures are you running?
try then and try harder
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| | tg2
| "Re(5):help on roof top comfort unit" , posted Sun 31 Jul 16:44:
thanks to all, it was indeed the compressor.it was relieving so quick i could not get a good pressure reading.replaced compressor and alls well.
[this message was edited by tg2 on Sun 31 Jul 16:45] |
| | KennyD
| "Re(6):help on roof top comfort unit" , posted Tue 2 Aug 23:24
Good deal. And I notice from your posts that you did it the next day too.
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