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Old 10-26-14, 10:13 AM   #4
AC_Hacker
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Quote:
Originally Posted by F357 View Post
...Problem is, after about 45 minutes the cold side freezes up completely...
It would be interesting for you to buy a cheap non-contact IR thermometer (harbor freight has them for about $10), and measure the temperature of the evaporator HX (the cold one).

Once you see how cold it gets, you will no longer be surprised by the formation of frost on the coils.

What you need to remedy this situation is a heat pump controller that will sense frost in the coils, and either pause the compressor, and wait for the frost to melt, or else run a de-frost reverse cycle.

A project thread has been started that would provide you with a working controller for just such a conversion as you are attempting.

Unfortunately, after three and a half months, and 270 posts, that project thread has yet to produce even an elementary controller that could serve your purposes.

Best,

-AC_Hacker
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