Install Batteries - Honeywell RTH7400 Series Owner's Manual

7 Install Batteries

Install two AA alkaline batteries and remove tab.
Back of thermostat
8 Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
9 Turn Power Back On
Turn the power back on to the heating/cooling system.
M28101
Circuit breaker box
Remove tab
M28103
or
Heating/cooling system
M31544
power switch
8
M28102