Question about Kenwood KW85 Air Conditioner

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P-tac unit shutting off

Whether its heating or cooling it runs for about 30-40 minutes and shuts off If I turn control to off then back on it will come on and run for about same time again then shut off. I've had 2 HVAC companies come and look at it first one cleaned the coils same problem 2nd outfit said they couldn't find anything that would cause this.

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Start the unit and check unit data ( suction pressure, discharge pressure, current reading voltage reading, check if no icing at compressor suction pipe and evaporator coil) if everything is normal. check the fallowing.
- check for out of range pressure switches. By pass pressure switches and start the unit if the unit continue to run check which of the pressure switch is open while the unit is running.
- check for defective timer and magnetic contactor or control rely.
- if the unit installed with freeze up sensor then check it also.
- Or the control by itself.

Posted on Dec 30, 2007


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