I have 2 wire (red & White) heat only system. It is steam heat run by gas. Currently I have Honeywell thermostat which uses 3 AA batteries. Thermostat has R, RC, O, W, Y, G terminals. R and RC terminals are connected by a jumper cable. I have Red wire connected to terminal R and white wire connected to terminal W.

Recently, I bought a White-Rodgers programmable thermostat with remote sensor. Which uses AC power, no batteries. White-Rodgers tech support told me I need one wire connected to terminal C (24 volt common), one wire connected to terminal R (24 volt Hot) and one wire connected to terminal W1 (Heating Relay ). But I have only 2 wires!! Tech support also told me I cannot use a jumper cable to connect terminal C and R. Terminal C and R should have separate power. I tried and field to run another wire from the transformer to the thermostat. When I called them again, I was told to install another transformer close to the thermostat and provide the extra 24 volt power from there. Now, I have 4 wires. Red and White wires coming from the basement and two new wires are coming from the terminal A and B of the new transformer.

I am not sure which wire would go to terminal C, R and W1. Could anyone help me with the wiring?

Thnaks,

TH

I, think this information will be use full http://customer.honeywell.com/NR/rdonlyres/5583F336-15A7-4301-BDC0-AD22653CDA20/581/706627.pdf

Now I am not a computer internet genius or anything but is this some sort of spam bot or something. Same post in other outdated threads.