Currently in a stupid argument with a coworker over the use of defrost clocks on walk in coolers, specifically ones at gas stations that typically have glass display doors and usually more than 1 evap...
Ok...I'm well aware with what can cause freeze ups...lets say that the refrigeration is working normally, charge is good and TXV's are working normally and the evaps are fully frozen over..
In this case I was taught that this freeze up is caused by too much "on" time and lack of "off" time
I was at this run down piece of crap gas station's walk in that was frozen up bad. All display door gaskets were crappy, box in bad shape and old, you name it. It had an old hussmann condensing unit with a copeland MRF 3 horse semi hermetic i think.
Well anyway...it had a defrost clock...it was locked up, so i replaced it after thawing coils and checking everything else as it's the most cost efficient for now.
My coworker is always like defrost clocks on coolers are stupid, you probably just set the stat too low, or why don't you back it up with low pressure control to avoid it?
I think that some applications need a clock...perfect example...walk in keg cooler that customer wants maintained at 34 or 33F....and in this case it might even need electric defrost cuz air defrost might not cut it with that low of a box.
What you guys think?
Ok...I'm well aware with what can cause freeze ups...lets say that the refrigeration is working normally, charge is good and TXV's are working normally and the evaps are fully frozen over..
In this case I was taught that this freeze up is caused by too much "on" time and lack of "off" time
I was at this run down piece of crap gas station's walk in that was frozen up bad. All display door gaskets were crappy, box in bad shape and old, you name it. It had an old hussmann condensing unit with a copeland MRF 3 horse semi hermetic i think.
Well anyway...it had a defrost clock...it was locked up, so i replaced it after thawing coils and checking everything else as it's the most cost efficient for now.
My coworker is always like defrost clocks on coolers are stupid, you probably just set the stat too low, or why don't you back it up with low pressure control to avoid it?
I think that some applications need a clock...perfect example...walk in keg cooler that customer wants maintained at 34 or 33F....and in this case it might even need electric defrost cuz air defrost might not cut it with that low of a box.
What you guys think?