Hello all. This is my first post on these here forums :)

I have been searching on the internet for weeks without success.

I have a Goodman B18099-13 Control Board on my furnace.

I've installed multiple duct fans in my duct work in order to increase the airflow through my wall/floor registers, but I'd like them to turn on at the same time as the main blower turns on.

Where can I tap into (on the control board) in order to do this? The duct fans operate on 120 volts AC. My main blower has 5 wires coming from it; black (?), white (neutral), red (?), orange (?) & yellow (?). I am not sure which one does what.

Any help that you could give me would be greatly appreciated.

Sincerely,
Kpj.

If I really had a good answer. I would have posted sooner. I don't have a copy of the installation manual for your furnace either, which is what is needed to answer your question. After finding time to study the manual for my furnace, I am going to do what I can. The black and other colored wires are for different speeds for the blower. My furnace, Bryant, has 2 different firing rates plus high and low cool. There are various switches and relays that select the speed the blower runs at. Some of the speeds are not used. That is controlled by moving wires around on the control board. With black on the high speed heat terminal, mine runs the fastest. There is a relay, controlled by a timer on the board, that activates which ever speed is selected by the other switches. If you can identify the terminal of that relay, or the equivalent of the high speed heat terminal, that is what you want to tie into. It is not hot until the furnace has had time to heat the air so it doesn't come out cold at first. I hope this gives you a little to work on so you can figure it out.

Labman,

Thanks for your response. I actually was able to figure this out on Saturday. I used a multi-meter & found out where 120v was once the blower kicked on. The spot was labeled "EAC" (not sure what that means).

Anyway, thanks again for taking the time to respond. I greatly appreciate it!

Kpj