CT3100
PROGRAMMABLE THERMOSTAT
WGicome to tha world of comfort and savings with your new Honeywell Magic Stat® electronic
thermostat. The Magic Stat® name is synonymous with innovation and state-of-the-art electronic
controls.
Your new thermostat will automatically control the temperature in your home within one degree of
your programmed setting, keeping you comfortable while saving energy, when programmed
according to the instructions in this manual. The automatic recovery feature calculates when to
start the heat or air conditioning so the home is at the comfort temperature at the time you
program.
Each day can be programmed differently or, if desired, the first day's program may be automatically
copied to the rest of the week. Six different heating/cooling temperatures can be entered tor each
day.
TABLE OF CONTENTS
INSTALLING THE BATTERY........................................................................................ 2
FEATURES OF YOUR NEW THERMOSTAT.........................................................................3
PROGRAMMING AND SETTING......................................................................................6
CHANGING...........................................................................................................15
TROUBLESHOOTING.................................................................................................I9
RELAY ORDERING INFORMATION
LIMITED ONE-YEAR WARRANTY.................................................................................25
...............................................................................
23
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INSTALLING THE BATTERY
A 9 V alkaline battery (purchase separately) must
be installed to save the program in case of a power
outage, and if programming the thermostat before
installing it.
For best results, replace the battery once every
three years to prevent loss of program.
FEATURES OF YOUR NEW THERMOSTAT
LCD DISPLAY—During operation, shows
room temperature and programmed tem
perature range continuously, or acts as a
digital clock. During programming, shows
the day of the week, time of day, and pro
grammed temperature range.
UP A and DOWN T BUTTONS—Lets you
change the temperature setting without
opening the cover.
LCD
DISPLAY
UPA AND
DOWN ▼
BUTTONS
Outside view of thermostat
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SYSTEM SWITCH—Lets you select heating or cooling operation. In OFF, furnace and air
conditioner are both turned off, while the thermostat remembers your program so it can resume
control when set back to HEAT or COOL.
FAN SWITCH—Lets you select ON for continuous fan operation, or AUTO for fan operation as
needed during heating and cooling.
MODE SELECTION BUTTON—Use to change modes—manual mode, setting the day and the
clock modes, temperature display mode, or time display mode.
TIME PROGRAMMING BUTTON—Use to set the correct day, hour, and minute, and to set the
desired times when programming temperature changes.
PROGRAM REVIEW BUTTON—Use when starting, reviewing, canceling, or changing the program.
HEAT BUTTON—Use to setthe desired temperatures in your heating program; to raise the setting,
hold the button; to lower the setting, tap it.
COOL BUTTON—Use to set the desired temperatures in yourcooling program;to lowerthe setting,
hold the button; to raise the setting, tap it.
RESET BUTTON—Small white button beneath battery cover which erases everything to start over.
BATTERY—9 V alkaline battery allows armchair programm ing before installation and 3-year backup
in case of power outage.
PROGRAMMING INSTRUCTIONS (NOT SHOWN)—Inside thermostat cover.
SYSTEM SWITCH
’ MODE SELECTION
BUTTON
. TIME
PROGRAMMING
BUTTON
PROGRAM REVIEW
BUTTON
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PROGRAMMING AND SETTING
You will program your thermostat once for the entire year, entering your temperatures for both
the heating and air conditioning seasons. You may enter heating temperatures between 54° F and
82° F, and cooling temperatures between 62° F and 88° F. A cool setting above 88° F (HI) leaves
the cooling off at any temperature.
The first program you set will be automatically copied into all 7 days. You may make changes later
to your program for the weekend. This typical weekday schedule suggests setting for atypical week;
fill in the blanks with your preferred schedule and use as a guide when programming.
Typical
Activity
Wake up
Leave Home
Arrive Home
After Dinner
Retire
Suggested
Time Schedule
6:15 AM
7:30 AM
5:00 PM
8:00 PM
10:45 PM
Your Time
Schedule
Program A Typical Weekday Schedule
7ou may program the CT3100 in your hand
before installation, oronthewall. If programming
Defore installation, the display will go blank durng programming if no buttons are pressed for
several seconds. There is no need to start over;
proceed where you left off, and the display will
eappear. However, if the CT3100 is already
vired to the wall when
irogramming, the dis)lay will stay on.
^ress reset button
jnder battery cover to
:lear out any program
>r setting already in the
nemory.
Suggested Program
Temperatures (° F)
Heat
68
54
68
72
60
Move the system switch
to HEAT. The display will
show current room tem
perature with MANUAL.
MANUAL indicates that
even though there is no
program in the thermostat,
it can be used as a manual
thermostat by selecting a
temperature using the UP
and DOWN
buttons when
the cover is
closed.
®®©®©©©
Cool
74
80
74
74
80
SYSTEM SWITCH
Heat
Off
Cool
nn
%Lf
Your Program
Temperatures
Heat Cool
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