Honeywell Lyric T5 Guide D'installation Rapide page 6

Removing your old thermostat
1 Turn power OFF.
To protect yourself and your equipment,
Turn off the power at the breaker box
or switch that controls your heating/
cooling system.
2 Check that your system is off.
Change the temperature on your old
thermostat. If you don't hear the system
turn on within 5 minutes, the power is
off.
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!
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OFF
Switch
Breaker box
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ON
OFF