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Old 06-30-2010, 01:28 AM   #1
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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
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Old 06-30-2010, 05:48 AM   #2
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goodman split a/c


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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