Monday, 8 February 2021

Tricking Furnace into Running Supply Air Fan 100%

I have an Armstrong 45198-006 control board on my furnace. Looking at the schematic in the manual it appears the "heat" or "cool" contacts relays need to be closed by the thermostat in order for the fan to run.

Is it possible to wire this furnace where the Fan "Auto/On" switch does anything? I cannot manually set the fan to run all the time.

Thank you,
jkpq45


source https://hvac-talk.com/vbb/showthread.php?2226438-Tricking-Furnace-into-Running-Supply-Air-Fan-100&goto=newpost

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