Booster Fan Wiring

[jpoci]

Guys - appreciate the help so far. I've been asking some questions related to adding heat/air to a 3rd story finished attic room. Framing is done and the contractor is just about to close it up with drywall. Before that's done, I'd at least like to put the wire in the wall for possible future use of a booster fan on this level. Yes, I've read on here that they don't work well. I just want to keep my options open and to do so I need to make sure I run the right wire.

Fantech and others look to be 120V connections. Should I just run a line of Romex from near the furnace to where I may want the blower? 2 or 3 conductor? If I understand, these are wired in with the blower. Does it need a switch line or is the hot just switched for the booster.

Thanks,
Jim

[beenthere]

Sorry, this is not a DIY site. So we are not allowed to give out DIY advise.

Please read Site Rules (http://hvac-talk.com/vbb/showthread.php?threadid=1241) Thank you.

[jpoci]

Sorry - didn't think this would violate the rules. I've read the policy. All duct work has been run by a licensed contractor, and he's already been out twice.

Not planning to install any equipment myself - I just wanted to make sure the wire was in the wall in case it was deemed necessary - an electrician would run it when he comes out to do some final rough-in.

Thanks anyway - the opinions on systems and design have been very helpful.

Jim

[bmathews]

Sorry - didn't think this would violate the rules. I've read the policy. All duct work has been run by a licensed contractor, and he's already been out twice.

Not planning to install any equipment myself - I just wanted to make sure the wire was in the wall in case it was deemed necessary - an electrician would run it when he comes out to do some final rough-in.

Thanks anyway - the opinions on systems and design have been very helpful.

Jim

You pretty much need to decide what you're going to do before you do it. It depends on how much current draw you will have and how long a run it is. I'm sure your electrician will be able to help you decide what is best for the situation.

[kwilcox]

If you plan on using something like a Fantech FKD8XL, have your electrician run a 15A circuit to a junction box near where your HVAC guy would place it inline. The FKD8XL draws 3A at full output.

The trick is how to get it to turn on with the furnace. I am not aware of the standards here but would say that using any 110v furnace taps would be completely unsuitable and probably dangerous. You would really need to discuss this with your HVAC contractor. My solution to this was to control the duct fan with UPB. Feel free to use google and learn more about this powerline protocol.

Sounded too much like DIY instructions.

[kwilcox]

sorry. My bad. I thought it was something a contractor would be able to do.

[beenthere]

It is.
But you gave a description of how to do it.

Which falls under DIY instructions.

[wraujr]

I always thought it was better to push air so any booster fan would/should be
down near furnace and its controls. Therefore you don;t need any wiring to the third floor... Just an opinion.