How DO you match up 3 wires (Green/Y/G), White (R/5), and Red (w/4) to a honeywell RTH 221B programmable that has places for a Y, G -- Rh and Rc (jumper) and W. This is a Zone Gas Hot Water Heat system, no AC.
Thanks

Methinks your new t-stat isn't compatible with your system. Do the installation instructions cover this application? If not, you'll probably need something different.

If your zone control is a White Rodgers the thermostat you have will not work.