Alternate Wiring - Honeywell RTHL221 series Quick Installation Manual

Advanced Installation Guide

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.
69-2578EF—01
O G Y
C X
or . Wrap bare end of wire with
20
4 4
R
and
R Rc
M32734
Rc
terminals,