View Full Version : clear ice on evap?
self employed 1
08-07-2005, 05:38 PM
the lower corners of the evaporator in the walk in cooler have baseball size/shaped growths of clear ice? 409-a, both coils are clean, door gaskets do leak a little. box cools great. do i just need a defrost clock? any advice would be apreciated.
08-07-2005, 09:09 PM
might want to check the drainage of the pan..
to see if the water escapes before the unit
goes back in to the freeze cycle..
dump a container of water in and see whats left..
08-07-2005, 10:55 PM
what freeze cycle does a walk-in COOLER go back into???
i have NEVER installed a walk-in cooler without a time clock and have added many to ones that were installed without them. in a perfect world where employees closed the damn door or did not overload the box with warm product you would not need clock, but that ain't my world.
08-08-2005, 12:19 AM
Every walkin cooler I've ever installed or serviced for food service, runs about a 28 degree evap.
Condesation freezes at 32 degrees...
08-08-2005, 07:17 PM
Clear ice buildup on a medium temperature evaporator is what I call "old ice".......as opposed to frost which is "new ice".
You get clear ice because the defrost period, whether it's from off-cycle or by timeclock, just wasn't long enough to completely rid the evaporator surface.
You can get old frost buildups in freezer evaps, but that would be another thread. ;)
08-09-2005, 08:01 AM
like was said...clear ice is old build-up and at the corners because of less air movement during off cycle...med temp coolers defrost during the off cycle and need off cycle to eliminate that from happening...once clear ice forms it will have to be physically defrosted as a few minutes off cycle time won't take care of what is now ice instead of frost....see a lot of c-stores with a door fan switch, which just adds to the chances of an ice-up taking place...not only is door left cracked open, but now fans are off...
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