Get 2 Wire Thermostat Wiring Diagram
Pictures. The 18 refers to the gauge and the 5 refers to how many individual wires are. Thermostat wiring colors and terminals.
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As shown in the diagram, you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals. Room thermostat installation & wiring guide: Here is the existing thermostat wiring (honeywell the 'b/c' wire might suggest common wire but it is already used for the rc (black wire). Here's the wiring diagram from the furnace panel
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