Quote:
Originally Posted by BMWGUYinCO
Well to be specific, in fact we have a two stage HVAC fan, which is set to constantly run 24/7 (so normal operation is at the lower, stage 1). When either the air conditioner or furnace comes on, the fan increases in strength (to stage 2). This ensures air circulation and more even air temps on all 3 levels of the home year round. This setting was also suggested by our HVAC installer as they claim this lowers how often the unit has to run in either air conditioning or heating mode.
But the humidifier running is independent of the fan - that only runs when the furnace comes on, and pushes out the humidified air at the stage 2 fan. Clear as mud?
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Sounds like you installed a current sensing relay on one of the fan wires. This insures the humidifier is only powered when the fan is running. Once the fan starts, the humidistat senses whether to open the water valve on the humidifier. As long as you have the relay on the "heating" speed, this should work fine. You don't want it running when the fan is on "circ" mode (what you are calling Stage 1). Only when the furnace is running.