Battery Installation; Thermostat Mounting; Power Options & Mounting; Battery Power - Honeywell PRO TH3210D Installation Manual

Installation Guide
Power options & mounting
Connect common
side of transformer
to "C" terminal
Install batteries in back of thermostat
(optional if AC powered).
AC Power
The thermostat can be powered by 24
VAC power, or by batteries.
To wire the thermostat for AC power,
connect the common side of the
transformer to the "C" terminal as
shown at left.

Battery Power

The thermostat can be powered by
batteries alone or, if used with AC
power, can provide backup power to
the display during power interruptions.
To Mount Thermostat
Align the 4 tabs on the wallplate with
corresponding slots on the back of the
thermostat, then push gently until the
thermostat snaps in place.
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