Remove Your Old Thermostat; Old Thermostat Removal - Honeywell RTH4300B Installation Manual

RTH4300B Programmable Thermostat

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
Is there a sealed tube containing mercury?
If so, see inside front cover of this manual
for proper disposal instructions.
Old thermostat
Cover