Wiring Honeywell RTH6450D for AC and heat

Old 07-27-14, 01:51 PM
Thread Starter
Join Date: Jul 2014
Posts: 1
Received 0 Votes on 0 Posts
Wiring Honeywell RTH6450D for AC and heat

Here is old config:

W1/Y (yellow wire to Y with jumper to W1)

Honeywell RTH6450D has wiring for "conventional" and "heat pump":

Y2 = L
W2 = Aux/E
G = G
W1 = O / B
Y = Y
R = R
Rc = Rc

R and Rc are jumped together.

I tried leaving C un-connected, tied W2 to W2, G to G, O to O/B (which is also W1), Y to Y and R to R, Rc. In this configuration "cool" = hot air, "heat" = cool air.

Any ideas would be grateful.
Old 07-27-14, 04:14 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,425
Received 17 Votes on 14 Posts
You must also configure the thermostat to control a heat pump with Aux heat.
Set function 1 to 5.

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