Thread: Help understanding operation of my AC unit with de-humidistat
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Old 04-26-2011, 06:53 AM
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ajbrown ajbrown is offline
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Default Help understanding operation of my AC unit with de-humidistat
Hope this is the right forum. Did not see All about airconditioners and things forum

I am testing my de-humidistat before I drift north for the summer. Thinking there may be some experts out here that can describe what I am seeing before my AC person comes over for the yearly inspection.

My de-humidistat is wired in series with the thermostat. When I am here in TV, I leave the de-humidistat in the ON position, so AC is controlled by the thermostat alone. In this mode all works as expected. Now I test the de-humidistat.

I set the thermostat to 70 degrees (colder than room temperature). I then turned the humidistat to 30%. The Trane XR80 air handler in garage and the compressor outside came on. This is good.

I leave the thermostat at 70 degrees and I next turned the de-humidistat to 80%. Now the air handler in the garage is ON but the compressor outside is OFF.

I now leave thermostat at 70 degrees and turn de-humidistat to OFF. The air handler in the garage is still running, but the compressor never comes on.

Without the de-humidistat, I do not think I ever hear the circulator ON when the compressor is OFF. Does what I am seeing make sense?

Thanks
Alan