About your new thermostat
Alternate Wiring
If labels do not match letters on the thermostat, check the
chart below and connect to terminal as shown here (see
notes, below).
B
If wires will be connected to both
remove metal jumper (see page 6).
Do not use
electrical tape.
If you have a heat pump without auxiliary/backup heat
connect O or B, not both. If you do not have a heat
pump, do not connect B. Wrap bare end of wire with
electrical tape.
Place a jumper (piece of wire) between Y and W if you
are using a heat pump without auxiliary/backup heat.
Thermostat does not work on Heat Pumps with auxiliary/
backup heat.
O
G
Y
C
X
or
. Wrap bare end of wire with
21
RTH2300/RTH221
4
4
R
and
69-2728ES—01
R
Rc
M32734
Rc
terminals,