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7 69-2715EF—07
Installing your thermostat
Wiring (Heat Pump System continued)
c In the image on the right, check the
box next to each connection. You will
use this checklist in Step 9.
d Verify wire is firmly secured by gently
pulling on wire.
e Repeat steps a–d for all other wires.
Note: If old thermostat has separate
wires on AUX and E, use a wire nut to
attach both wires to a separate wire.
Slide this third wire into the W2Aux/E
terminal.
f Push any excess wire back into the
wall opening after all wires are
installed.
g Continue to page 8.
Labels don’t match?
See alternate wiring
keys on pages
78.
Important!
Check the box for each wire
you connect. You will need
this information in Step 9.
C
K
Rc
R
W-O/B
Y
G
W2-
Aux/E
Y2
L
Alternate wiring (Conventional System)
Use this if your wire labels
don’t match the terminal labels.
Note: You must have a C wire
or equivalent. See page 5.
Alternate wiring key (Conventional System)
1
• If you have both an R and Rc wire, unplug the jumper loop by pulling on the wire
loop.
• If your old thermostat had both R and RH wires, connect the R wire to the Rc
terminal, the RH wire to the R terminal, and unplug the jumper loop.
MCR36751
C
R
W
Y
G
1
1
C
K
Rc
R
W-
O/B
Y
G
W2-
Aux/
E
Y2
L
W1
W2
Y2
RH
4
V
Rc
R
C1
X
B
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