Honeywell RTH9580 Wi-Fi, User Manual, Page: 17 / 160

15
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
W2-Aux/E
terminal.
f Push any excess wire back into the
wall opening after all wires are
installed.
g Continue to page 20.
Labels don’t match?
See alternate wiring keys
on pages 18-19.
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