Question about Whirlpool Electronic Window Air Conditioner ACQ158XR

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Air compressor does not kick in unless ambient temp is > 80

I have a window unit air conditioner and the compressor seems to only kick in when it is really hot in my bedroom. Otherwise, the fan just runs all night long. I have the thermostat set to the maximum setting yet it does not blow cold air when the ambient temp in my bedroom is in the 70's. Should I replace the thermostat? Should the air baffle be closed to disallow outside air to come in? Thanks.

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  • john170 May 22, 2009

    I meant "conditioner" - not 'compressor' - anyway, i have the fan on low and the vent (baffle) closed to disallow outside air. Closing the vent seemed to help slightly.

  • Robert Moller
    Robert Moller May 11, 2010

    Is the fan on high or low ?


  • Anonymous Mar 15, 2014

    when i power on the unit failed to produce cold air, just the fan alone running and now the compressor stutters to come on

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Do not operate low fan and maximum temperature as the coils will freeze up stopping air flow.

Posted on May 22, 2009

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SOURCE: Window unit air conditioner kicks in only when its really hot out

I would consider replacing the t'stat if it does not seem to cycle at the desired temps. Also, the outside air allows fresh air to be introduced into the conditioned space but it will also effect, to a degree, the units ability to cool the conditioned space. Once you get the unit running, try it with the baffle on and closed and see which one you like. Remember, the outside air has and add humidity and can make it seem hotter than it really is in the room.

Posted on May 22, 2009

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1 Answer

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I'm going to share a trick.........a refrigerant tank with either a slight amount of liquid or a lot of liquid, can be identified by comparing the saturated liquid temperature (using a Pressure/Temperature chart) and the ambient temperature of the air which the tank is stored. Your ac, though it has lines, coils, etc, is a sealed system with saturated liquid and gas. That said, as long as they are exposed to the same ambient temperatures, the pressures (without the compressor running ie: OFF) will be equal. One of the two gauges is off 10psig.

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The outdoor coils are 30 above ambient so the hot outdoor air will still be cool in relation to the hot refrigerant gas and remove heat to condense it back to a liquid. Since the pressures and temps are according to ambient there isnt any way to not have the amp draw increase with load.
That said check the breaker for age and replace if not pretty, check all connections for tightness, consider dedicated circuit.

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1 Answer

Window unit air conditioner kicks in only when its really hot out


I would consider replacing the t'stat if it does not seem to cycle at the desired temps. Also, the outside air allows fresh air to be introduced into the conditioned space but it will also effect, to a degree, the units ability to cool the conditioned space. Once you get the unit running, try it with the baffle on and closed and see which one you like. Remember, the outside air has and add humidity and can make it seem hotter than it really is in the room.

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