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; V! r. M" c. _8 u3 hIf you have two wires, normally it shall be a red and white. The red is 24V ac power from furnace transformer. The white shall be heat signal. Just act like a switch on and off.2 B4 B* L$ A( @# {5 b
The new thermostat shall have few terminals: R-Rc, this terminal shall be red wire, W---for white wire. Leave the other terminal empty. (If you need furnace fan controlled by the thermostat, then connected the green wire the G, Green wire may still be inside the drywall)
6 }0 j# {( U% l1 KBefore doing this, make sure the switch for the furnace shall be off. The switch shall be close to the furnace, normally is BX cable, which has spiral metal shied around it. |
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