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: http://www.totaline.com/corp/details/0,,CLI1_DIV38_ETI7662,00.html
I have to connect it to a honeywell R845A relay. You can find the manual here: http://customer.honeywell.com/techlit/PDF/60-0000s/60-2481.pdf
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 problem: 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.