Keep blower on after AC off


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Old 05-31-15, 12:04 PM
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Keep blower on after AC off

As it stands now my ac compressor and main blower turn off simultaneously. A thermometer at the first vent from the unit reads 45 degrees. I can manually turn the blower on and get more of that residual cold air in the house. I'd like to do it automatically. I've read the HVAC unit manual and looked over the unit but don't see any adjustments to make that happen. How can I do this? 25 year old HEIR furnace and Tempstar condenser.
 
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Old 05-31-15, 12:23 PM
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Need the model number of the furnace.
 
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Old 05-31-15, 01:49 PM
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You could just replace your thermostat.
 
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Old 05-31-15, 04:44 PM
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Model number? This is what's in the model number square: NUGE075CH02 867.768241

New thermostat? I'm using a 5 year old LUX TX9000TS with digital touch screen. Don't see anything in it's manual about setting the blower to run after the ac shuts down. Do other t-stats have this setting. Is there a specific term for this setting?

Poked around and found this. Do you think it would work? Blower Control | Delay Timer | ICM Controls
 
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Old 05-31-15, 05:10 PM
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Yes.... that module would do want you want but one undesired side effect is that you will be picking up the moisture from the coil and putting it back into the house.
 
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Old 05-31-15, 05:56 PM
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Yep, running the fan after the compressor has shut off would increase the humidity in the ductwork and would grow mold in my area.

The moisture would blow off of the coil and into the duct work after the compressor cycles off.

 
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Old 06-01-15, 12:30 PM
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I take it moisture will collect on the coils as the air blowing by it warms? Kinda like a glass of ice tea on a hot summer day? We live in the Mojave desert with little humidity. I'm thinking this condensation won't be a major concern here during the summer - yes/no?

The module voltage range fits great with my 24 volt system. I've seen it for $25 to $60 at various places on the net. Might just give it a try. Just wish the time limit was a bit longer. The "off delay" of 390 seconds is just short of my ideal 7 minutes.

Thanks for your time guys. I'm a regular on several automotive forums so I have a good idea of the efforts you're putting in here.
 

Last edited by layzee; 06-01-15 at 12:45 PM.
 

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