Honeywell RTH8580WF User Manual page 13

Installing your thermostat
2 Remove old thermostat.
Remove the old
thermostat while leaving
the wallplate and wiring
in place.
Take a picture of the
wires on your old
thermostat for later
reference.
Terminal
designation
If you have an older thermostat with a
sealed mercury tube, turn to page 2
for proper disposal instructions.
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69-2715ES—01
MCR33823