3
Complete Steps 1.1 through 1.6 in the
Quick
Start Guide
.
• Identify existing wires and verify that there
is no C wire (
Quick Start Guide
Step 1.2).
If you have a C wire, you do not need to
install the wire saver.
• If your old thermostat has no C wire connector but the wire bundle from your heating/
cooling system includes an extra wire not connected to the old thermostat, you can use
that wire to connect your Wi-Fi thermostat’s C terminal. You do not need to use the wire
saver. Refer to the Alternate Wiring video at wifithermostat.com/videos
Take a photo of the wire connections (
Quick Start Guide
Step 1.2) or make notes
to carry to your heating/cooling system.
Step 1
Verify that you need a wire saver
Quick Start Guide
Wi-Fi Programmable
Thermostat
RTH6500WF Wi-Fi Series
Important!
Ensure that the system is OFF
(
Quick Start Guide
Step 1.1)
