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Wiring a booster fan to furnace

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  • Oct 30th, 2020 11:54 pm
Oct 29, 2020
1 posts

Wiring a booster fan to furnace

Hi everyone,

I've bought an inline fan, and added it to the ducting which supplies my attic. I wired the fan to the blower motor connections (neutral to neutral bar, and hot spliced into 'circ' wire). The fan engages when the furnace kicks in, but doesn't shut off when the furnace fan shuts off.

Furnace is a Coleman TM9Y060B12MP11A.

Any help would be greatly appreciated.


1 reply
Sr. Member
Jan 19, 2013
670 posts
Its possible but not the recommended way to do it. Probably would damage the board
Correct way is to have a external power source, controlled via current or pressure sensor, or a relay activated by the furnace board.
The CIRC-H terminal you have there is just constant power


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