Step 4 - Connect the New WiresĬonnect the wires of the wireless thermostat according to the manual instructions. If the colors or connector labels do not match, be sure to make notes of which wire was used for what connector. For instance, you may have red, white, and yellow wires, and their respective connection labels will be R, W, and Y. In most thermostats, the connections for the wires are labeled with the first letter of the color of the wire. Disconnect the wires, but note which connectors they are attached to. ![]() The wires leading from the thermostat come this box, and then junction off to their various required locations. Step 3 - Disconnect the Wiringīeneath the mounting plate is the wiring box. Most mounting plates are held in place by two to four screws, which are easily accessed when the thermostat face is no longer blocking it. This plate is used to give the thermostat a uniform mounting surface, and will be different from one thermostat to the next. Remove the existing mounting bracket or plate. ![]() Step 2 - Remove the Existing Mounting Plate Inspect the wiring to be sure that everything is in good working order. Next, pull the face of the old thermostat off the wall. Begin by disconnecting power to the HVAC unit and thermostat.
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