Gas oil or electric furnace 1. 6 13 for wiring diagrams. New Honeywell Thermostat Rth7600 Wiring Diagram Diagram Ac service tech llc 91 915 views 5 39 mistakes made when hooking up a thermostat avoid them watch. Programmable thermostat wiring diagram . Programmable thermostat quick installation guide 69 2421es 03 69 2421es 03 ii quick installation guide identify system type this thermostat is compatible with the following systems. Refer to table 2 for descriptions of terminal designations. Mounting and wiring your new thermostat install new thermostat base mount your new thermostat base using the supplied screws. Click the icon or the document title to download the pdf. Programmable thermostat wiring diagrams 2 wires 3 wires 5 wires many thermostat manufacturers provide detailed installation instructions with their thermostats to make sure you have all the information you need to install the thermostat properly. Some programmable thermostats e g. Heating controls