lexscripta
28-08-2009, 10:30 PM
Hi Guys,
A 3/4 hp 404A medium temp walkin system rated at about 7500 BTU, @ 90 Ambient.
So, I realized that my actual ambient is rarely less than 100 degrees, and often hovers in the 110 -115 range. Looking at the charts reduces capacity down to around 3500 BTU at that temp.
Lots of bubbles in the site glass = NO subcooling.
Anyhow the thing was adjusted by someone by reducing the refrigerant, 'cuz if you charge it up, we see in excess of 375 PSI liquid line pressure. On occasion the HP Cut out trips.
To keep SOME cooling, its apparent that the refrigerant was bled off on purpose because of the High ambient. However, low refrigerant means high compressor temps and poor oil flow. Consequestly, the compressor trips off once in awhile.
Can't install a condenser outside, no place for AC. So, heres the question. Anyone have any ideas on how to go about installing a subcooler? Or maybe the best question is who has something like that for a system this small? Has anyone put in a Sub Cooler of their own making? I was thinking along the lines of something like the variety seen in Manitowoc Ice machines, but that takes a lot of water.
So there ya go. I didn't add too much in the way of measurements because with a reduced charge, SH is going to be High anyhow, and its obvious there's no SC.
A 3/4 hp 404A medium temp walkin system rated at about 7500 BTU, @ 90 Ambient.
So, I realized that my actual ambient is rarely less than 100 degrees, and often hovers in the 110 -115 range. Looking at the charts reduces capacity down to around 3500 BTU at that temp.
Lots of bubbles in the site glass = NO subcooling.
Anyhow the thing was adjusted by someone by reducing the refrigerant, 'cuz if you charge it up, we see in excess of 375 PSI liquid line pressure. On occasion the HP Cut out trips.
To keep SOME cooling, its apparent that the refrigerant was bled off on purpose because of the High ambient. However, low refrigerant means high compressor temps and poor oil flow. Consequestly, the compressor trips off once in awhile.
Can't install a condenser outside, no place for AC. So, heres the question. Anyone have any ideas on how to go about installing a subcooler? Or maybe the best question is who has something like that for a system this small? Has anyone put in a Sub Cooler of their own making? I was thinking along the lines of something like the variety seen in Manitowoc Ice machines, but that takes a lot of water.
So there ya go. I didn't add too much in the way of measurements because with a reduced charge, SH is going to be High anyhow, and its obvious there's no SC.