Honeywell Thermostat TH3210D User Manual download pdf (Page 8)

Installation Guide

6

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.

Connect common

side of transformer

to “C” terminal

Install batteries in back of thermostat

(optional if AC powered).

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.

Power options & mounting

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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