Honeywell MagicStat 28 Programming And Installation Instructions page 23

connectors (purchased locally) to extend wires.
See illustration (above) for guidelines on using
wire extenders.
In 5-wire installations only, be sure to
remove the factory-installed jumper
connecting terminals R and Rc.
Loosen the terminal screws and slip each
wire beneath its matching terminal. See
illustration (lower right) for wire insertion
technique. Tighten terminals securely.
Plug the hole in the wall with insulation to
help prevent drafts from adversely affecting
thermostat operation.
PROPER WIRING TECHNIQUE
INSERT
STRAIGHT
5/16 in.
UNDER
[8 mm]
SCREW HEAD
STRIP
END OF WIRE
VISIBLE HERE
21
PROPER WIRING TECHNIQUE
M3666
JUMPER (FACTORY-
INSTALLED) REMOVE
IF 5-WIRE SYSTEM
M1712A
INSTALLATION