Removing Your Old Thermostat - Honeywell Home RTH7460D1018 Quick Installation Manual

Quick Installation Guide

Removing your old thermostat

1
Turn power OFF.
To protect yourself and your
equipment, turn off the power at
the breaker box or the switch that
controls your heating/cooling
system.
2
Check that your system is off.
Change the temperature on your
old thermostat to be above room
temperature in heat mode or below
it in cool mode. If you don't hear the
system turn on within 5 minutes, the
power is off.
Note: If you have a digital
thermostat that has a blank display,
skip this step.
3
Remove the old thermostat's
faceplate.
On most thermostats, you can take
off the faceplate by grasping and
gently pulling. Some thermostats
may have screws, buttons, or clasps.
Do not remove any wires from your
thermostat at this time!
4
Make sure there are no 120/240V
wires.
Do you have thick black wires with
wire nuts?
Is your thermostat 120V or higher?
If you answered yes to either of
these questions, you have a line
voltage system and the thermostat
will not work.
Breaker box
ON
OFF
75
Wire nut
Thick black wire
2
ON
OFF
OR
OFF
Switch
75