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Thread: copeland discus oil pressure
07-30-2012, 09:53 PM #14
07-30-2012, 10:00 PM #15
07-30-2012, 10:04 PM #16
No module Six.
07-30-2012, 10:07 PM #17
So, it's just a mechanical control. No biggie, we see them every day.
3/4 glass is a shade high, but acceptable. That low oil pressure is bugging me.
I typically see an unloader controlled with a low pressure control, but there are other ways.
I'd grab a full set of system readings, map out a wiring diagram and something will probably jump out at you.
07-30-2012, 10:28 PM #18Professional Member*
- Join Date
- Dec 2005
Also, there may be trash in the load/unload chamber so that the needle does not seat/seal well or tightly. Thus, the unloading piston chamber is exposed to the suction side and makes it running unload.
07-30-2012, 10:36 PM #19
I think Carlyse has the jump on Copeland for better load and unloading of semi hermetic compressors.
07-31-2012, 06:51 AM #20
Thanks for the help. I'll let you know what I come up with.
07-31-2012, 08:09 PM #21
Changed the oil three times. Oil was nasty. Replaced suction core and liquid line drier. Checked suction screen. Its now running with 50 psi oil diff. Loading and unloading properly ( low voltage was wired wrong). All seems good except high superheat (35*) and low subcool (5*). 74 suction 317 liquid line. I know probably still undercharged, just wanted to let it run a while and check it after space has cooled.
07-31-2012, 08:13 PM #22
35* at the compressor is not that bad!
what is 317 liquid line?
do you have 75# suction or 75* suction line????????I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!
07-31-2012, 08:29 PM #23
75# suction line
317# liquid line
07-31-2012, 09:27 PM #24Regular Guest
- Join Date
- Jun 2011
- Detroit vicinity, Michigan
I'm betting on a plugged condenser.
07-31-2012, 09:35 PM #25
07-31-2012, 11:26 PM #26
High load (80*). One txv and no solenoid. 100*+ ambient. There is possibly some condenser air recirculation too. It has a solid brick wall on three sides about 20" out.