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Thread: Testing for noncondensables
02-26-2013, 12:36 AM #27
02-26-2013, 02:58 AM #28New Guest
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02-26-2013, 09:28 AM #29
02-26-2013, 07:31 PM #30
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02-26-2013, 09:18 PM #32Regular Guest
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02-26-2013, 10:34 PM #33Regular Guest
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- Feb 2013
- Phoenix, Arizona
Turn system off and let the pressure stabilize, then read the pressure of the system is it relating to the PT chart for the Ambient condition? If it is then your good if not then air has entered the system. If the pressure is higher than what it should be then there is most definitely air in the system.
If it appears to have air inside of it then the next thing you should do is look for traces of oil along the lines (previous leaks, possible it leaked out before & someone just placed more refrigerant back in within without pulling a vacuum to remove the moisture from the system). If it looks like this is the case, recover the refrigerant into a recovery bottle & then get a vacuum pump to remove the remaining moisture. If it does not pull down the there is a leak present in the system, repair it before going any further.
Then pull a vacuum & either place the existing refrigerant from the bottle back in or better yet if funds are not an issue place new refrigerant inside the system. Also do not forget to get an acid test kit & take a sample of either the oil from the compressor by removing it & turning it upside down or getting a sample by the refrigerant from the service port. If acid is present then you will need to treat the oil.
02-27-2013, 08:54 AM #34
Kool Tech, your method will only work if the air conditions are the same indoors as they are outdoors. As mentioned on page one of this thread, what if it's 70 degrees inside the building and 90 degrees outside? Both temps are going to affect the pressure in the system.
Thanks, everyone, for the replies, even the fundamental replies regarding recovery, leak detection/repair, filter/drier replacements, evacuation and recharging.A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii