HProHVAC
13-10-2011, 01:47 PM
Hello to everyone, and thanks in advance. I'm an owner of an HVAC service company and deal with some refrigeration for existing customers, mostly small deli equipment and walk-ins.
I have a Hussmann NVGC-120 single duty, gravity deli case that has a problem with freezing. The owner called because it leaks on the floor and makes the it dangerous behind the counter.
I found that the bottom stainless steel pan is covered with ice. The evap coil on top is completely clear of any ice and the case works well otherwise. I noticed that the entire rack below the product is lined with ceramic tiles for appearance purposes. The owner said that they've always been there, but the case was existing when he bought the deli 3 years ago. (the case was manufactured in 2000).
It seems to me that the tiles blocking the air from circulating is the cause due to the pan getting too cold and the condensation not being able to dry off.
I figured I'd run it by someone here since while my experience in HVAC is extensive, lets just say that the refrigeration side is something I don't deal with as often.
Any thoughts would be appreciated.
Rusty
I have a Hussmann NVGC-120 single duty, gravity deli case that has a problem with freezing. The owner called because it leaks on the floor and makes the it dangerous behind the counter.
I found that the bottom stainless steel pan is covered with ice. The evap coil on top is completely clear of any ice and the case works well otherwise. I noticed that the entire rack below the product is lined with ceramic tiles for appearance purposes. The owner said that they've always been there, but the case was existing when he bought the deli 3 years ago. (the case was manufactured in 2000).
It seems to me that the tiles blocking the air from circulating is the cause due to the pan getting too cold and the condensation not being able to dry off.
I figured I'd run it by someone here since while my experience in HVAC is extensive, lets just say that the refrigeration side is something I don't deal with as often.
Any thoughts would be appreciated.
Rusty