Honeywell Chronotherm III User Guide

REPLACING THE BATTERIES
Your thermostat uses three AAA
alkaline batteries. The display will
flash “REPL BAT” when the bat-
teries get low. Unless the display
is blank (indicating the batteries
are dead) when you start, you
won’t have to reprogram the
thermostat if you can insert the
new batteries within 20-30
seconds of taking out the old
ones.
POWER OUTAGES
Reasonably fresh backup batter-
ies will hold the programming
and keep the display on during
most power outages. Once the
power is restored, the system will
resume normal operation.
To replace: n Insert the new batteries, mak-
n Set the system switch to OFF.
ing sure the positive (+) termi-
n Remove the thermostat from
nals all face toward the right.
the wall. See page 27.
n Replace the thermostat on the
n Lift the batteries out of the
wall. See page 28.
holder. n Reprogram, if necessary.
If the display goes off when
power is lost, either the backup
batteries need to be replaced or
are not installed. When power is
restored, the display will flash
1:00 PM to remind you to
reprogram.
29
30

Honeywell Chronotherm III Specifications

General

Operating Modes	Heat, Cool, Auto, Off
Programming	7-day programmable
Stages	1 Heat/1 Cool
Type	Programmable
Voltage	24VAC
Display	Digital
Programmable Periods	4 per day
Backup Battery	AA alkaline batteries (2)
Temperature Range	40°F to 90°F (Heating)