Ok here's what I got:
I have an Totaline wireless tstat, model P474-1100RF, and receiver,
model P474-1 100REC, that I want to use with my old furnance.
Here is a link to info about the tstat and receiver:
I have to connect it to a honeywell R845A relay. You can find the
I have two wires coming from the relay,(red and white) to the back of
the existing programable tstat.
I connected the white to the W1 and the red to the R of the new tstat.
The furnace starts fine with the old one in place. I have a 2-wire
connection and both tstats (old and new) are designed to accept more
connections than what I need (cooling, a fan, etc.) I installed the new
stat and when the tstat calls for heat I can hear a buzzing at the
furnace, it sounds like the relay is trying to engage but cannot.
Any suggestions would be helpful.