Honeywell CT2800 Owner's Manual - Page 11

Old thermostat terminals that do not match new thermostat terminals Use the table below to wire the new thermostat. Old Thermostat Terminal Connect to New Thermostat Terminal R, RH, 4, V R* Rc, R Rc* W, W1, H W Y, Y1, M Y G, F G O Do not continue B installation C, X, B W2, H2 Y2 Do not connect Do not continue installation. Description Power Power for cooling Heat Cooling Fan Changeover in cool (O terminal) or changeover in heat (B terminal). You have a single-stage heat pump or zoning system. Select an alternate thermostat model. Transformer common. Second stage heat (W2, H2) or second stage cooling (Y2). You have a multistage heating/cooling system. Select an alternate thermostat model. *Remove factory-installed jumper between R and Rc terminals in 5-wire systems. 11 69-1638-1