7
Alternate Wiring (For Heat Pumps Only)
2
3
3
4
5
5
6
6
MCR28077
Leave metal jumper in place, connecting
R
&
Rc
terminals.
If your old thermostat had both
V
and
VR
wires, stop now and contact a
qualified contractor for help.
If your old thermostat had separate
O
and
B
wires, attach the
B
wire to
the
C
terminal. If another wire is attached to the
C
terminal, stop now
and contact a qualified contractor for help.
If your old thermostat had
Y1
,
W1
and
W2
wires, stop now and contact a
qualified contractor for help.
If
L
terminal is used,
C
terminal wire must be connected (contact a
contractor if there is no
C
wire).
If
E
and
Aux
terminals do not each have a wire connected, use a small
piece of wire to connect them to each other.
5
6
