Original message
| ejohn90472
 |  "Freon Leak"
, posted Wed 10 Aug 23:55  
I have a Rheem 80 Plus 5 ton unit and it appears every month I lose all the Freon. We pressure tested the entire system to 200psi for approximately 15 mins then sucted the lines for another 15 or 20 mins and found no leaks. However, every month we lose the Freon and cannot find any leak. We checked the evap coil and it appears clean with no shows of visible leaks. Any suggestions on how to trouble shoot this type of a problem? Thanks
EJ
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Replies:
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| jbmendoza
| "Re(1):Freon Leak" , posted Fri 12 Aug 04:52
i have that kind of problem in my citec denco presision aircon waht i did is isolate the compressor by shuting down the valve, pull out the TXV,and the solenoid then i inject 350 to 400psig nitrogen slowly and carefully then wallah the small leak has shown up you cannot find leak with 200psig, but be carefull with nitrogen you should know the maximum pressure of your pipe
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| OldTech
| "Re(1):Freon Leak" , posted Thu 11 Aug 17:19
I assume you know unless someone is robbing your refrigerant there has to be a leak anywhere in the outdoor unit, indoor unit, or tubing connecting the two. I really can't think of anything to do but use a good electronic leak detector.If you don't have access to one with your leak I would think with 300 to 350LBs of nitrogen you should almost be able to hear the leak if it is one of the coils. Be careful with your low side gauge if using this pressure because you'll be replacing it.
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| Banger
| "Re(1):Freon Leak" , posted Thu 11 Aug 05:49
That's a pretty significant leak - If I were the tech I would start with an electronic leak search with a good leak detector and if I couldn't identify the leak that way I would use dye injection method. Leaks in the evaporator can be tricky because the leak might be inside the aluminum sleeve and following to the end of the coil leaving almost no oil residue.
Don't forget to check the service valves and gauge ports too - Gauge ports don't leak with the manifold attached & are the most often missed when leak searching.
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