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HVAC fan

940 views 10 replies 2 participants last post by  beenthere 
#1 ·
why do i hear more noise out of my blower motor when in heat mode then i do in cool, its an all in one gas heat unit mounted on the roof. I hear the noise from the air return line not the out put vents
 
#5 ·
May be the mechanical noise of the blower running at a lower speed. Some blower motors labor more at a lower speed then they do at a higher speed.
 
#7 ·
Remove the lower speed tap wire from the heating speed tap on teh board, and run a jumper from the cooling board tap to the heating board tap.

I would also check bearing play in the motor.
 
#9 ·
The burners don't use the same air as the house does. the burners would be using a draft inducer, which is not the same as teh blower that moves air in your house.
 
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