Basic Wiring Diagram Heat Only Thermostat. To begin with select your own language. If the system has a plate optional to wall using screws provided see Fig.
If any wires are not attached to the terminals of your old thermostat you do not need to label them as they will not be connected to your new thermostat. The common wire sometimes referred to as the c-wire is whats responsible for delivering constant power to your thermostat. Basic thermostat wiring for furnace and air conditioner.
Wiring diagrams you may need to read the following section carefully several times.
Basic thermostat wiring for furnace and air conditioner. Ignore wire colors use only letter designations to identify wire types. 5-Ton AB Units with X Motors Only. The basic Heat AC System thermostat typically utilizes only 5 terminals.