walk in cooler won't cool
Need some info on this point:
I have a walk in that is perking out at 60 degreef temps.
It has a Tecumseh compressor water cooled in the basement crawl pumping up to a duel fan evaporator in the cooled. I have:
set the high head to bang on 200psi: got the suction at 60 psi (should be cooling at 32 degreef): no problems with the accumulator or dryer: cleaned the evaporator coil so you can eat off it: tested the 2 fans for amp draw and rpm: checked the compressor and it only draws 5.6 amp fla.
Why the hang can't I get better than 60 degreef cooling? I haven’t gone as far as sizing the unit to the cubic feet in the cooler because I didn't think it necessary. I worked before. This drop in temp has been an ongoing thing over the past 2 months
what refregerant do you have it banging on?
Assuming you are 134A?
Need a lot more info on operating conditions,such as superheat and subcool,and discharge superheat.
When was the last time the condensor was cleaned?
Stinks that it's in a crawlspace.
Moved to Refrigeration and Ice making.
Need a lot more info.
As mentioned, SH and refrigerant type are the biggest.
60# is 24 degrees on 404. A wee bit high, but it will get you in the 'cooler' range.
If it is 404 and you have a solid column of liquid look at the TEV.
start with air flow.. though evap, and though condensor.. always start with air flow and clean coils
As i said you can eat off the coils so restriction of air flow is not a problem. It's an old water cooled R22. No I did not do superheat. These units are no that sofisticated. I rely on my guages. The high head has been adjusted to 200 and the low side is topped to 60psig. My cooling should be around 32F. The history on the unit as relayed to me from the owner is that it has been topped a couple of times in the past 2 years. Contaminated gas has crossed my mind. As a solution before condemming the compressor might be to evacuate and put in fresh gas. Thoughts?
Uh Oh, you better duck!
Originally Posted by trout lake
"The trouble with the world is the stupid are cocksure and the intelligent full of doubt" -Bertrand Russell
Check the compressor.
60# on R-22 will get you a 32 degree evap.
That's almost AC temps, boss.
You need about 20# lower suction. Look at the compressor.
And BTW. Superheat is very important. "Just using your gauges" is only doing half the job. Age of the equipment not withstanding..
You need more info for a proper diaignosis.
It could be anything.
Information is power.
Waddya mean don't thaw out the frig with a knive?
Originally Posted by smilies