oztech
17-01-2013, 08:02 AM
Hi guy's, got a problem i can't work out - overheating compressor due to suction line not cold enough (not cold or condensating).
Arrive to the job, little water cooled temperzone package unit, scroll compressor, approx 2hp.
Through the gauges on, 75lb x 290lb - on R22. Felt suction line, veagly cool.
Dropped a bit of gas out down to 60lb x 270lb thinking it might be overcharged by another techo. Felt suction line after 5 minures - same !!
After a few more minutes compressor drops out on overload. Being its a small unit and only holds 600grams of gas, i dropped the charge (recovered if you like), thinking their could be a koktail or incorrect gas in it, vacced out and recharged back to 60 x 270.
Same thing happens. Called techo's at temperzone, came to agreement, compressor probly a bit inneficient - changed compressor, but for a recip hermatique, as they can handle heat far better than scrolls (sais the compressor supplyer).
Charged her up - overheated again, grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.
Disconnected water exit from condenser, opened inlet, and out poored tunns of water into a bucket, so no blockage in condenser. Returned water back the other way - same again, so no blockage at water filter.
Im a bit perplexed guy's, why can't i get nice cold gas returning to the compressor no matter if i over charge a touch, or undercharge a touch, or what seems to be the norm in system pressures on 22 at 60 - 65lb suction x Around 250 - 280 head.
Coil temp for the first four runs is nice, cold and sweating, then just tapers off towards the top runs.
Any ideas fella's.
Cheers, John Mac (Sydney).
Arrive to the job, little water cooled temperzone package unit, scroll compressor, approx 2hp.
Through the gauges on, 75lb x 290lb - on R22. Felt suction line, veagly cool.
Dropped a bit of gas out down to 60lb x 270lb thinking it might be overcharged by another techo. Felt suction line after 5 minures - same !!
After a few more minutes compressor drops out on overload. Being its a small unit and only holds 600grams of gas, i dropped the charge (recovered if you like), thinking their could be a koktail or incorrect gas in it, vacced out and recharged back to 60 x 270.
Same thing happens. Called techo's at temperzone, came to agreement, compressor probly a bit inneficient - changed compressor, but for a recip hermatique, as they can handle heat far better than scrolls (sais the compressor supplyer).
Charged her up - overheated again, grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.
Disconnected water exit from condenser, opened inlet, and out poored tunns of water into a bucket, so no blockage in condenser. Returned water back the other way - same again, so no blockage at water filter.
Im a bit perplexed guy's, why can't i get nice cold gas returning to the compressor no matter if i over charge a touch, or undercharge a touch, or what seems to be the norm in system pressures on 22 at 60 - 65lb suction x Around 250 - 280 head.
Coil temp for the first four runs is nice, cold and sweating, then just tapers off towards the top runs.
Any ideas fella's.
Cheers, John Mac (Sydney).