I have been doing grocery store refrigeration for the past 3 years. Alot of our low temp coffin cases were setup for 1 defrost a day, 5-10 minute drip time, usually a 48-50 degree termination based on supply air temp. We usually get 1 freeze up a year on most of the cases with no issues found. Usually the low temp ice cream coffins. We have been changing to 2 defrost a day as the 1 defrost hasn't been effective. (All heaters/klixon are working properly. Drains are trapped properly and clear, etc.) My question is why does the manufacture (hussman/hillphoenix) recommended 1defrost a day for an hour if it never holds up?
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