Honeywell Thermostat Wiring Diagram

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Shielded cable is not required. Keep wires in this shaded area caution: Can cause electrical shock or equipment damage. Disconnect power before wiring.

2 transformers remove jumper wiring diagrams terminal. Heat pump systems with auxiliary/backup heat (alternate wiring). If your old thermostat had e and aux wires (or alternate wires), connect both wires to aux. Thw wire color and terminals you gave for your old thermostat or not what we typically see, if you can let me know the model of old. Following diagrams is fairly simple, but making use of it inside the scope of how the device operates is a new different matter. The best advice is not necessarily only look from the diagram, yet understand how the components operate when in use. Honeywell thermostat wiring diagram 4 wire source: The thermostat uses 1 wire to control each of your hvac system's primary functions, such as heating, cooling, fan, etc. See the diagram below for what each wire controls on your system: