I recently purchased a Honeywell RTH7500d off of ebay so when i moved into my newly purchased house that I could so some energy saving changes.
I went tonight to install new t-stat but noticed when i removed the old Lennox one from the wall taht there is only 2 wires, white & black, and the instructions for the new t-stat mentions nothing about them. Did some searhing on the net but found a lack of required information to install to this system. Please help!
for heat only
If its for heat only then run the wires to w and r..
does it matter which colour wire goes to which connection?
no it does not.. If you are using only two wires.. NOw if there were more then it would matter.
Unless it is a power stealing thermostat then it does not matter.