Install Battery - Honeywell RTH8500WF Wi-Fi Series Quick Start Manual

1.8 Install battery

Insert the coin cell battery
(included), observing
the correct polarity.
Note: A correctly inserted battery will
extend about halfway out of the battery
slot on the thermostat, allowing for
easier removal.
This battery maintains time and date
during power outages. It does not
power the thermostat (C wire
required).
1.9 Attach thermostat
to wallplate
Align the thermostat onto
wallplate and snap into place.
Thermostat interior
M31542
Wallplate
HEAT PUMP
CONVENTIONAL
Y2 RC RC
M31543
R R
L
AUX
W2 W O/B
/E
K Y Y
K
G G
C C
Thermostat
9