Tip & How-To about Heating & Cooling
Any time you diconnect any wires from anything always mark the wires with a piece of masking tape and write where you removed it from, especially if you don't have a wiring diagram.
Then write it down on a piece of paper and draw a picture of where it came from. that way if you can't fiqure it out or if the new part has different colored wires or extra or fewer wires then, you can at least know where the old wires went and somebody can help you fiqure it out.
Posted by Bill Long on
Cut the furnace's power source before beginning. Check for a power switch near your furnace or turn off the electrical power supply at the circuit breaker.
2Turn off the gas supply if you have a gas furnace. Look around the furnace for a black pipe. This pipe is the gas line. Check for a valve located near the pipe. Turn off the gas supply by moving the valve so it's perpendicular to the gas line.
Take off the thermostat's old cover by unscrewing the screws that attach the cover to the wall. Some covers don't have screws and simply pull off.
Unscrew the mounting plate and notice the wires.
Place a small piece of masking tape on each wire. Use a felt-tip marker to mark the masking tape according to the wire's screw terminal location. Usually, the wires are marked with letters.
Disconnect the low-voltage wires from the base plate by loosening the screws and then pulling the wires away.
Locate the mounting screws for the base plate. Unscrew them and take off the base plate. Guide the base plate over the wires carefully.
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