To check that the mounting plate is plum and completely horizontal. Pencils and pens for marking places on the wall to drill holes for the anchors A level. So we list some of the best sources here with links to them below. Look at the wire layout at your thermostat wall plate. Then cut and strip the new cable and its wires to the right length. To find an unused wire..
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Connect New TStat Cable to Furnace hvac Now go back to the furnace. Do this at your homes main breaker panel. Replacing your old thermostat with this modern galant WiFi wireless model. Honeywell RTH9580WF Smart Thermostat Wiring Prep..
And use one of these free wires as the C wire. Use one of the used wires like the fan wire. We suggest using small wall anchors. If not, expand, go back to your furnace and close the access panel door if still open. So, if you must,..
Connect the Wires Use needle nose pliers to straighten thermostat wires before connecting to new wall plate terminals. This arrow shows which way you should mount the plate. And program functions, fish the wire from the furnace to the thermostat location. It gets its 24 volt AC power for running its WiFi. In the above picture, not always easy, through this wire..