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25-03-2012, 09:51 PM #1
Freezer Compressor needs a CPR valve?
I have been working on a reach in freezer on a that has a MOP expansion valve. I am have trouble with the compressor starting and staying online when coming out of defrost. My thought is it needs a CPR valve, but I know you can't have both devices on the same unit. The expansion valve has been recently changed so I think is doing what it is designed to do. Would it be advisable to change to a regular expansion valve and add a CPR valve?
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26-03-2012, 01:26 AM #2
Re: Freezer Compressor needs a CPR valve?
If MOP TXV has been changed recently check selection, as they have a couple of control ranges, check that you have the low temp application range.
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26-03-2012, 04:15 AM #3
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Re: Freezer Compressor needs a CPR valve?
after you checked what magoo said .
has compressor have unloading systems or not if yes check that system .
also you can give time between defrost and ran time in compressor with running fans (some digital a defrost timers has got this option) 3 - 4 minutes is enough , in this time evaporator temperature comes down after defrost ( so our suction pressure comes down)
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26-03-2012, 05:22 AM #4
Re: Freezer Compressor needs a CPR valve?
"Reach in" freezer so it will be a sealed unit. Evap fans should not start straight after defrost.( As mbc has said)
Coil has to chill down first. Check your run capacitor. MOP 45 or 60?To the optimist, the glass is half full. To the pessimist, the glass is half empty.
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26-03-2012, 01:42 PM #5
Re: Freezer Compressor needs a CPR valve?
"MOP 45 or 60?"
It should be, even for ºF, much lower...To make progress is never good enough, I want to do better and better and better