Air condtioning wiring on Electric furnace?

Question

I have just installed an air conditioner in an electric furnace, but I can't figure out the wiring to make the high speed fan come on with a call for cooling. It is fairly old so I have used a fan center and the 24V side is working fine but I can't figure out the wiring on the 120V side to make the high speed fan come on. There is a Fan/Limit Switch, isolating relay, and sequencers. Any help would be great.

Answer 1

If it is an older furnace you may have to install a switch to turn the fan on and just leave it on through out the summer this works OK and is like having a air filter running all the time and some people do that anyway but you need to change the filter once a month.

Good luck.

Answer 2

There is 2 screws that hold the fan and blower in the furnace frame. You can remove the screws and slide the blower out. On the motor there is a number of connections. wires are color coded and white is common and usually black is High speed. being it was used for htg. it may be using the medium stab. Unplug the blue and try the black or red. this will speed your fan up.  Slide it back in on the tracks....  Good luck