Honeywell Home RTH2510 Quick Installation Manual page 5

3
Identify Wires
If any wires are not attached to your old thermostat or
are attached to a terminal marked C or C1, they will not
be connected to your new thermostat. Wrap the bare
metal end of each of these wires with electrical tape, so it
cannot touch and short other wires.
Do not use non-connected
wires.
Do not use C or C1 wires.
Identify and label each wire.
IGNORE WIRE COLORS:
Use terminal screw
designations to identify
wires.
Disconnect wires and remove the old wallplate only after
all wires are labeled. Wrap the wires around a pencil to
prevent them from falling though the wall opening.
RTH2510/RTH2410
3
M29988A
69-2421ES—05