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Thanks the defrost is hot gas. is this a maintenance or rather a poor maintenance issue?

Thanks for all the help guys. i am located in Ky and we have been hit very hard with an ice storm. the freezer is kept at -20f. it did go thru a refridgerant change a few years back. i think to 504 if that makes sense. the cross section of the coils looks like a smilly face, complelty...

the room is kept at minus 10 degrees F

Hope someone can help me. I am an engineer at a plant that manufactures food flavorings. Our large inside freezer 3000 sq ft, uses two evap coils 3' x 12' by 2' thick. They were installed in 1999. The coil has failed many of the copper tubes have collapsed. The maunfactur Coil Company Inc has...