duct fan wiring question

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  #1  
Old 11-14-06, 10:56 PM
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Question duct fan wiring question

I am needing to install an in-line duct fan. The fan is 110v, I want to get this fan to cut on when the system's blower comes on. The system's blower is 220v. How can I make this happen? Is it possible?

Thanks in advance,
dogthenine
 
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Old 11-15-06, 03:41 AM
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A device like this would simplify the installation of your fan.

http://www.smarthome.com/3018.html

Check to see if the maker of your fan offers this.
 
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Old 11-15-06, 08:46 AM
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Install a "sail-switch" that will operate when there is air-flow, and will close a contact. The contact-closure can close the 24 volt control-circuit of a switching relay. The switching-relay contacts can switch either a 120 volt load, or a 220 volt load.

See "useful Web Sites" ( beginning of this Forum) for the WSA of the Honeywell "on-line" catalog.
 
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Old 11-15-06, 05:03 PM
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You will need a seperate source for the 110 fan, and some type of control, such as an end switch/relay to verify flow (sail sw,proof sw, etc.)

Curious, What's the use?
 
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Old 11-19-06, 10:25 PM
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I have a room (livingroom/den) that is not getting enough air/heat. My old duct work looked like it had been stepped on and bent back to shape. I replaced it with new duct work and still have the same problem. I think the length of the register from the main source is too far for the main blower to push the air that far. Therefore, I am installing an in-line duct fan.
 
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Old 11-20-06, 04:23 AM
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90% of the time these duct fans do not help. If you want to give it a shot a sail switch will get you there.
 
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Old 11-21-06, 05:02 PM
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You may want to try the HVAC page. For your plans may degrade the entire system.
 
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