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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8037
Experience:  Furnace, A/C and heat pump specialist.
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Tried to fix my furnace mysef. noticed the Black wire from

Customer Question

Hi- Tried to fix my furnace mysef. noticed the Black wire from the ACB (Main Bower motor) is not connected to anything... Where on the WHite Rodgers Control board # ***** woud this Back wire go to?
Submitted: 11 months ago.
Category: HVAC
Expert:  airheatman replied 11 months ago.

Let me see if I have a wiring diagram.Tell me where other motor wires are connected

Customer: replied 11 months ago.
Red goes to "Park" E28; Blue goes to "Park" E27
The rest are capped / back taped...
Expert:  airheatman replied 11 months ago.

Black is HIGH speed. Usually goes to COOL. Do you have a HEAT and a COOL terminal on board?

Customer: replied 11 months ago.
Expert:  airheatman replied 11 months ago.

Is there currently a wire to each?

Expert:  airheatman replied 11 months ago.

Or is there a jumper from Heat to COOL?

Customer: replied 11 months ago.
There's a "Cool H" and a "Heat H" terminal (2 total) that had a white jumper between them. So does the Black Blower wire tap into that place too?
Customer: replied 11 months ago.
Are you still there? Yes- there's a jumper between the "Cool H" & "Heat H" terminals.Boes the Black ACB Blower wire tap into that same place too??
Customer: replied 11 months ago.
Hello!!! Are you there??
Expert:  airheatman replied 11 months ago.

The motor wires are as follows:
Black =High

Blue+MED

Orange =Med Lo

Red = low

Depending on heating and cooling requirements the speeds are selected using different colors.If your system need same speed for heat and cool only one speed wire will go to The COOL terminal with a jumper between HEAT and COOL.

If you need different speeds for heat and cool, the jumper is removed and one speed wire to each of the terminals.

There are only 2 park terminals for unused speed wires so the extra has to be taped off.

You can remove the jumper and place the black on COOL and Orange on heat if you want two different speeds for heat and cool. See diagram below

Expert:  airheatman replied 11 months ago.
Customer: replied 11 months ago.
Hmm... No Orange wire from Blower. Just White, Black, Red,& Blue... So I jumpered the Black Fan Motor wire onto where the Jumper on the Cool / Heat Terminals, adn it seems to be working now!! THANK YOU, ***** *****!!
Expert:  airheatman replied 11 months ago.

If you have further questions, please let me know.

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