Many refrigeration systems are designed for the evaporator to run below 32F,
so they have a defrost feature.

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Christopher A. Young
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"Vic Dura" wrote in message
...
Somebody mentioned several days ago that ice formation on an a
refrigeration evaporator can be caused by low freon (or perhaps air in
the system, I don't recall which). I've been wondering about that for
the past few days. Why would low freon or air in the system cause ice
formation? I'm just curious as to what the theory behind that is.

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