How do I safely remove my existing thermostat for a Honeywell RTH5160 replacement?

[Eugene]

To safely remove your old thermostat and prepare for the Honeywell RTH5160 Non-Programmable Thermostat installation, follow these steps:

1. Cut the Power: The most crucial step is to cut power to your heating and cooling system at the circuit breaker box. This prevents electrical shock.
2. Verify Power is Off: After turning off the breaker, double-check by adjusting the temperature on your current thermostat. Set it above room temperature if in heat mode or below in cool mode. If the system doesn't activate within five minutes, you're safe.
3. Detach the Faceplate: Most thermostats have a faceplate that easily pulls off. Some may use screws, buttons, or clips. Carefully remove the faceplate.
4. Identify Voltage: Inspect the wiring. If you see thick black wires secured with wire nuts, or if your thermostat is marked as 120V or higher, you have a line voltage system. The Honeywell RTH5160 is not compatible with these systems. Consult a qualified HVAC technician in such cases.
5. Photograph the Wiring: Before disconnecting any wires, take a clear picture of the wiring. Ensure the letters next to the terminals are visible; these letters are vital for re-wiring your new Honeywell thermostat.
6. Disconnect and Label Wires: Use a screwdriver to carefully detach each wire from its terminal. As you disconnect each wire, attach a wire label. Each label should correspond to the letter on the terminal. To prevent wires from falling back into the wall, gently wrap them around a pencil or similar object.

Once you have completed these steps, your old thermostat is removed, and you're ready to install your Honeywell RTH5160, using the instructions provided in its manual.