Honeywell RTH7400 series - Remove Old Thermostat; Cooling System

3
50 60 70 80 F
OFF
AUTO EM. HEAT
EM. HEATAUX. HEAT
50 60 70 80
MCR33835A
Remove old thermostat but leave wallplate with
wires attached.
2
Remove Old Thermostat
1
Turn OFF Power to Heating/
Cooling System
Is there a sealed tube containing
mercury? If so, see back cover
for proper disposal instructions.
Leave wallplate
in place
Old thermostat
Cover
or