Need help with wiring a Honeywell RTH9580wf Thermostat.

Old 06-11-14, 06:59 PM
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1
Received 0 Votes on 0 Posts
Need help with wiring a Honeywell RTH9580wf Thermostat.

Hello everyone,

New here and need some help/info.

I am trying to wire a new honeywell t-stat to replace an old York Mercury thermostat. I have a heat pump as well as an electric furnace.

I am having some problems with the wiring. Nowhere I find what my wiring looks like.

The first picture is the current (old) setup. Second pic is inside my furnace...

Thanks for the help
Attached Images   
Old 06-11-14, 09:02 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,425
Received 17 Votes on 14 Posts
Old = New
G = G
R = R
W = Aux/E
B = C
X = I'd tape this heat strip wire off in my area but connect it to Aux/E if up north.
O = O/B
Y = Y

Configure for heat pump with Aux heat.
Energize the reversing valve to cool.


Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: