I am trying to replace an old ITT thermostat model T99BV303J with a new programmable thermostat. The new Honeywell model RTH2300 says I need to identify the terminals (Y, W, R, G, etc) in the old thermostat as a first step. Nowhere on the old thermostat does it say what either of the two wires (one red, one white) is associated with. Is there a way to determine how the two wires correspond to the terminals in the new honeywell thermostat?