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Jacques 06-30-2010 02:28 AM

goodman split a/c
as a 'rule of thumb' what back pressure would you see on a 18000 btu condensing unit R-22 type if it was working ok in cooling mode...Thnx's

COLDIRON 06-30-2010 06:48 AM

To many variables to put a pressure on it depend a lot with the temperature outside and the temperature inside, the fan speed, how clean the coils are, and many other things. But on a hot 90degree day an average back pressure should probably run about 68LBS. Please don't hold me to it like I said to many variables.

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