Old Thermostat Removal; Remove Old Thermostat - Honeywell RTH3100C Installation Manual

Remove your old thermostat
1. Turn off power at heating/cooling system (or fuse/circuit-breaker panel).
2. Remove cover and thermostat, but leave wallplate with wires attached.
Leave wallplate in place.
Old thermostat
Cover
Is there a sealed tube containing mercury?
If so, see inside front cover of this manual
for proper disposal instructions.

RTH3100C