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Thread: high liquid line pressure?
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11-03-2009, 12:21 PM #1
high liquid line pressure?
hi all,
just wanna ask some opinions if poss, as some of you may know im new to commercial, i changed a small condensor unit today, it was a heatcraft kirby ba9 unit, i changed the dryer as well and was advised by our supplier to remove liquid reciever as it is a capillary system, i tripple evaced system and charged r22 (original used) i started up and system was slightly short soi added some more, i finished up with suct 47psi, -5°c sst, and 9°c on suct line exit cabinet (cabinet was not down to temp was at 12°c) that was 14k super heat, liq line worried me though it was up 380psi, 67°c sct, but the liquidline temp was perfect at 34°c, the system is approx 5 ft wide and has a coil built in storage area floor, it also has a static coil at top which is a horizontal 3 turn evap, no s/air or r/air readings avail but unit took 15 mins (once pressures wer ok) to cool from 27°c to 15°c and dropped fast, air on cond was 29°c air off was 39°c, after a while longer i began to get some flood back so i recoverd a small amount taking frost bak to around 25 cms from evap exit, my new suct pressure was 41 psi, -8°c sst, and still about 9°c on suct line, liquid line was still high at 335 psi, 60°c sct, and still about 34°c on liquid line, is it normal for a capillary controlled unit to have a higher liquid line pressure?? sorry for beating around the bush and sorry if i just confused yas with my dribble but any q's or input will be appreciated take it easy guys. oh, by the time i left it was 6°c and no more flood backs im confident its working ok but just not sure if liquid line pressure too high
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11-03-2009, 02:09 PM #2
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11-03-2009, 08:23 PM #3
Re: high liquid line pressure?
As Temprite says, check at design cabinet temperature.
You action of 'adding a bit more' before the case temperature had stabilised at design gave you additional problems.Brian - Newton Abbot, Devon, UK
Retired March 2015
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08-05-2009, 11:35 AM #4
Re: high liquid line pressure?
aim for a minus 20c sst at temp when charging a static coil. whatever the gas. some slight adjustment may be required but you'll be pretty close.
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08-05-2009, 08:26 PM #5
Re: high liquid line pressure?
was the condensor the same size as the original and what was the reason for replacement
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09-05-2009, 05:36 PM #6
Re: high liquid line pressure?
I hope that Tech Tim himself, at least, stays safe and sound after the repair. I wish we were more often providing follow-ups on our problems, no matter what the issue was.
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