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redman88 12-02-2012 11:21 AM

HVAC fan
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

redman88 12-02-2012 10:43 PM

No help out there?

beenthere 12-03-2012 04:05 AM

Does it use a different speed for heat then it does for cooling.

redman88 12-03-2012 08:56 AM

not sure, but it does feel like it is slower on heat

beenthere 12-03-2012 09:02 AM

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.

redman88 12-03-2012 09:07 AM

whats the best option for fixing it?

beenthere 12-03-2012 09:12 AM

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.

redman88 12-03-2012 09:35 AM

no worries about over powering the burners?

beenthere 12-03-2012 09:39 AM

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.

redman88 12-03-2012 02:41 PM

so is it bad for the motor to be run the way it currently is or should i bypass the low speed?

beenthere 12-03-2012 03:47 PM

Shouldn't hurt it.

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