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Old 06-22-2007, 03:30 PM   #1
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how to wire an in-line duct fan on an arcoaire twostage furnace


i have the schematics for the wiring on the arcoaire furnace. I tried to connect the wiring for the inline fan to the wire running from the control board to the motor. but wired this way the duct fan runs constantly even when the blower shuts off.

how do i wire this??

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Old 06-22-2007, 07:41 PM   #2
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how to wire an in-line duct fan on an arcoaire twostage furnace


First off, never wire two motors in parallel you will cause problems. Secondly an inline duct fan can't make up for inadequate duct work, if the air isn't there it isn't. If you are dealing with a run that has a lot of resistance from too many fittings, a fan pulling through them may help. If you want to do it right, power up a switching relay with a 24volt coil off the control circuit that powers the blower. You could also use a amperage pick up switch that are available for humidifier control. It would sense when the blower motor is running and energize your relay coil. The line voltage power coming from the furnace service switch.

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