Sledge
12-06-2007, 12:44 AM
Hi
I have a customer with a reach in display box, designed as a freezer, but being used as a cooler. Actually I dont have the customer yet, but apparently the company that sold her this unit has been struggling to make it work for 2 years...without success. I have been consulted and will probably get a call this week.
So, I am trying to get my head straight on the issues.
The problem, or so I am told is that it will run ok for about 18 hours and then fail. Evap will be completely frozen up. There is an electronic temp control built-in that also controls the defrost. Defrost is every 4 hours, off cycle, with no heaters. Target temp for displaying cheese etc 4c(37F).
I was able to see the coil, and it appeared that the coil was a low temp coil, with at least 1/4 inch fin spacing. It looked to me like the pan was not draining the water adequately.
Things I dont know:
compressor, refrigerant, tx size, pipe size, SH, air flow, defrost termination.
Any thoughts?
What are the factors around deciding fin spacing on a coil? What should the air flow be for the different fin spacing?
I have a customer with a reach in display box, designed as a freezer, but being used as a cooler. Actually I dont have the customer yet, but apparently the company that sold her this unit has been struggling to make it work for 2 years...without success. I have been consulted and will probably get a call this week.
So, I am trying to get my head straight on the issues.
The problem, or so I am told is that it will run ok for about 18 hours and then fail. Evap will be completely frozen up. There is an electronic temp control built-in that also controls the defrost. Defrost is every 4 hours, off cycle, with no heaters. Target temp for displaying cheese etc 4c(37F).
I was able to see the coil, and it appeared that the coil was a low temp coil, with at least 1/4 inch fin spacing. It looked to me like the pan was not draining the water adequately.
Things I dont know:
compressor, refrigerant, tx size, pipe size, SH, air flow, defrost termination.
Any thoughts?
What are the factors around deciding fin spacing on a coil? What should the air flow be for the different fin spacing?