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donbuilder
Dec 13, 2008, 05:02 PM
I have an old (1960's) oil fired, hot water baseboard heating system. I would like to install a honeywell rth221b digital thermostat. There are two wires (white & black)coming out of the wall, no labels on old thermostat and furnace only has "T" marked by each wire. Of the 5 possible hook-ups on the new thermostat labeled "Y,G,Rh,Rc,W" - which two are likely candidates? I have already been to "yourhome.honeywell.com"....no help.:confused:
hixton
Dec 13, 2008, 05:07 PM
Rh and W