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Can use some help on this one...
WillM
Member Posts: 3
I just put an outside thermostat on my new boiler to help save on gas. Realized the comfort aire air handler ahg30-0a won’t run the fan. Guessing there’s a thermostat inside of the air handler that requires the water temperature to be above a certain degree in order for the fan to turn on. Is there a way to lower the temperature setting?
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Depends on the aquastat installed .. In the attic on the return from the heating coil the aqustat that turns on the fan would be installed . If it's a plain preset clip on you would have to be replace to an adjustable or lower set point model . An reverse or "B' strap on aquastat with adjustments would be my choice . If one is already installed , just lower the set point. ...
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So I would need to buy an aquastat and wire it into the air handler In order for the fan to run at lower water temperatures (140°)?0
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There doesn't seem to be an aquastat on board. The fan is controlled by a "Blower Time Delay", adjustable from 30-45 seconds.
https://s3.amazonaws.com/s3.supplyhouse.com/product_files/brochure1.pdf
It may or may not be the culprit and you would need a voltmeter to figure it out.8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
So the AC works with the fan when called but the heat does not so I don’t think it’s the time delay0
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WillM said:So the AC works with the fan when called but the heat does not so I don’t think it’s the time delay
If you have a thermostat with a swich on the inside for electric or gas/oil heat you can switch it to electric and the thermostat will energize the cooling fan relay when it calls for heat.0 -
You may find that with lower boiler water temp that the air may feel too cool for comfort.
And if you run the fan at the higher AC speed it may be cooler yet.
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If the fan came on before installing the outdoor reset but now will not turn on with the lower water temperature .It would be a good guess a temperature sensor switch (aqua stat) was controlling the fan .. Look on the return pipe from the heating coil , usually install by the air handler .. What type do you have ?
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