Remove Your Old Thermostat; Old Thermostat Removal - Honeywell RTH8500 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.
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RTH8500