Honeywell RTH5100B Owner's Manual page 4

3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
4 Separate Wallplate from New Thermostat
Remove wallplate from the new thermostat and mount onto wall.
5 Mount Wallplate
Mount the new wallplate using the included screws and anchors.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
Terminal designation
M28100
Wallplate
4
Wire Labels
C
M29532
MCR29533
MCR31537