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Thread: Mcquay PTAC
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07-08-2011, 09:29 AM #1
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Mcquay PTAC
Mcquay PTAC: compressor runs for a while, seems to be cooling, then compressor shuts off and digital display starts flashing "LA." Could it be a Thermistor problem? Charge may also be slightly low as only the bottom 1/3 of the evaporator seems to be sweating. (85* ambient and very high humidity at test bench)
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07-09-2011, 07:41 PM #2
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mod#?
Guinness for strength
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07-11-2011, 09:32 PM #3
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ptac
wat kind of ptac do u have
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07-11-2011, 10:01 PM #4
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It is a model PDAA. The evaporator and condenser were both filthy, I cleaned them both with Nu-Brite and bench tested it. It ran, but I was only getting 13* delta T across the evap. That is setting on the bench, no shroud, just running in my shop. (93* ambient) Tomorrow I'm gonna install it in one of the empty apartment rooms and test it under a more controlled situation.
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07-12-2011, 10:02 PM #5
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Ran unit all day long in an empty aptmt. Ran fine, kept room at 72* with compressor cycling on and off, but suction pressure (R-22) is 85PSIG! That is factory charge, no one has added any refrigerant to the system. Still only getting 10*-12* delta T across evap.
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08-31-2011, 11:59 PM #6
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TXV or Constant Pressure Expansion Valve?
--Paper Road
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09-01-2011, 08:09 AM #7
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neither, it has a cap tube.
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