unknown. Depends on how much R12 is in the system. Is the comp running?
Hey guys , new here, usually in residential tech area.... I have an older refrigerator that is not cooling. Why are there 3 tubes coming off the compressor, 2 to the condensor and the third to the evaporator. I put a line tap to check the pressures but don't know what the low side should be. What should the equalized pressure be at ambient 70 F?
THanks
Greg
unknown. Depends on how much R12 is in the system. Is the comp running?
One of the two into condenser isn't a process stub?
Maybe looks as if going to condenser?
Just a thought!
Pull charge and weigh in with adequate replacement!
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Look at your PT chart for R12. It holds the answers to your questions.
The pressure at 70ºF should be obvious.
Then think about how a typical domestic refrigerator works and what temperature the evaporator must be to achieve 0ºF to keep your ice cream frozen.
compressor is running, was wondering what design low pressure should be, can see a fourth tube that is stubbed off, sorry, not thinking cause I do have a pressure chart so.... 0 degrees for freezer looks like around 9 PSI for evaporator, ambient 70 degrees around 70 PSI. No cool evaporator line on compressor so I can't see any other problem other than low charge, fans working, when I finally got tap in place, about 50 PSI and pulled down to 0 PSI when running.
Thanks for your help
I did appliance repair a long, long time ago and if memory serves you could be looking at an oil cooler. Seems the compressor oil cooling was a small circuit routed through the static condenser, but it should have a return line into the compressor. Look again, are you sure there isn't another tube?
As far as suction side pressures listen to icemeisters advice, but seems self defrost models, R-12 would typically run around 3 lbs and manual defrost types would be a little higher, like 6 or 7 lbs.