Remove Old Thermostat - Honeywell RTH8500 Owner's Manual

2 Remove Old Thermostat

Remove old thermostat but leave wallplate with wires attached.
Do not remove wallplate yet
Terminal
designation
3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them, then
remove the old wallplate. Wire color might not match labels.
4 Separate Wallplate from New Thermostat
Remove wallplate from the new thermostat
and mount onto wall.
If you have an older thermostat with a
sealed mercury tube, turn to page 2
for proper disposal instructions.
C
Terminal designation
M28100
4
MCR33823
Wire Labels
C
+
+
+
Wallplate
MCR31537
M28334