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Old 03-11-2012, 06:45 AM   #1
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Inline booster fan


I would like to hook up an inline booster fan to my Luxaire furnace fan.
This is controlled by a W H model 50A50- 241.
How do I know which wire Is for blower fan ?

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Old 03-11-2012, 07:36 AM   #2
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Inline booster fan


you need to add an isolating relay with a 24AV coil first off power the fan directly with 115V then break the hot wire thru the N.O. contacts.so when the fan runs in the heating cycle the booster runs.keep in mind the control board has a fan relay mounted on it and is rated for the uit supply fan not an add on...even as small as a booster.somebody might kick in where to pickup the 24V fan ON signal for that unit.generic relay like this http://www.bestbuyheatingandaircondi...Code=REL90290Q

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Old 03-11-2012, 09:45 AM   #3
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Inline booster fan


there is no 24V fan on signal. You should be able to wire the booster fan directly to the EAC terminals on the board. They are 120V output. IF your booster has a large amp draw then you will need an isolating relay with a 120V coil.
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Old 03-11-2012, 11:51 AM   #4
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Inline booster fan


Another option.
Some of my clients have chosen to put a sail switch in an adjacient duct to switch on a booster on a duct with poor air flow. This can be preferable if the booster is to located some distance from the furnace because all the wiring can often be located just in the booster vacinity.
Note. The sail switch needs to be on a different duct than the booster.
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Old 03-11-2012, 12:30 PM   #5
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Inline booster fan


As I recall I ran a 120v Romex line directly from the 120v furnace blower to the two speed duct fan.

I guess I figured the shaded pole duct fan motor was so small in comparison to the 1/2 hp blower motor that the control relay contacts wouldn't know the difference.
So far I have been right and it's been years.

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Old 03-11-2012, 12:34 PM   #6
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Inline booster fan


Thanks all,
I will try connecting to the EAC terminal as the amp draw is only 0.35 amps for the booster fan.

No sail switch nesseccary as I already have wiring at furnace ( unfinished basement ceiling ) .

Will update you all when complete.
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Old 03-12-2012, 04:22 AM   #7
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Inline booster fan


Connecting directly to the EAC terminal on the board works perfectly.

Thanks hvactech126

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