Honeywell CT3400 User manual

30%
28%
26%
24%
22%
20%
18%
16%
14%
12%
8%
6%
2%
10%
4%
Minneapolis
St. Paul
Montreal
Ottawa
Toronto
Buffalo
Cleveland
Milwaukee
Edmonton
Regina
Winnipeg
Calgary
Moncton
North Bay
Quebec
St. John's
Halifax Vancouver Denver
Des Moines
Omaha
Salt Lake
City
Boston
Chicago
Detroit
Pittsburgh
Indianapolis
Cincinnati
Kansas City
St. Louis
Columbus
New York
Philadelphia
Seattle
Louisville
Portland
Wash., D C
San
Francisco
Dallas
Atlanta Los Angeles
Approximate percentage of energy cost savings
Savings for Once-A-Day
10°F [5°C] decrease
Savings for Twice-A-Day
10°F [5°C] decrease*
Savings for 5°F [3°]
summer increase
TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA
*Based on 10°F [5°C] decrease—(5°F [3°C] decrease
gives approximately 55 percent of these savings).
M2416A
San Diego
B.M. Rev. 5-94 ©Honeywell Inc. 1994 Printed in U.S.A. Form Number 69-0733B—1
PROGRAMMABLE
THERMOSTAT
Honeywell/34
PROGRAMMINGAND INSTALLATION
INSTRUCTIONS
Rev. 5-94 Printed in U.S. 69-0733B—1
Weekday/Saturday/Sunday
Programmable Heat and/or Cool
Thermostat and Wallplate
Model CT3400

TOTAL COMFORT TEMPERATURE MANAGEMENT
WITH ADAPTIVE INTELLIGENT RECOVERY™
Congratulations! You made a smart choice when you purchased your new Honeywell Thermostat.
It’s the smart thermostat that:
■ Keeps you comfortable by automatically calculating exactly when the furnace or air condition-
ing should go on to have the house at the desired comfort temperature by the time you wake
up or return home.
■
Saves the maximum amount of energy and money by remembering to automatically adjust
the heat or air conditioning when you leave home or go to sleep.
■ Provides the ultimate in comfort and convenience . It comes already programmed, so it’s your
choice—use the preprogrammed schedule or set your own.
We invite you to spend a few minutes reading this manual. You’ll find it answers many of the
questions that will arise as you become familiar and comfortable with your Honeywell thermostat,
the state of the art in home comfort controls.

TOTAL COMFORT TEMPERATURE MANAGEMENT
WITH ADAPTIVE INTELLIGENT RECOVERY™
Congratulations! You made a smart choice when you purchased your new Honeywell Thermostat.
It’s the smart thermostat that:
■ Keeps you comfortable by automatically calculating exactly when the furnace or air condition-
ing should go on to have the house at the desired comfort temperature by the time you wake
up or return home.
■
Saves the maximum amount of energy and money by remembering to automatically adjust
the heat or air conditioning when you leave home or go to sleep.
■ Provides the ultimate in comfort and convenience . It comes already programmed, so it’s your
choice—use the preprogrammed schedule or set your own.
We invite you to spend a few minutes reading this manual. You’ll find it answers many of the
questions that will arise as you become familiar and comfortable with your Honeywell thermostat,
the state of the art in home comfort controls.

169-0733B—1
Table Of Contents
STEP 1 Prepare For Installation..................................................................................................... 2
STEP 2 Remove Old Thermostat ................................................................................................... 4
STEP 3 Before You Program.......................................................................................................... 6
Install the Batteries .................................................................................................................... 6
Adaptive Intelligent Recovery™ Selection .............................................................................. 7
STEP 4 Program The Thermostat .................................................................................................. 9
STEP 5 Mount Thermostat Wallplate........................................................................................... 16
STEP 6 Adjust System On-Length, Clock Display, as Required .............................................. 18
STEP 7 Adjust Fan Operation Switch, as Required ................................................................... 20
STEP 8 Wire Wallplate Terminals ................................................................................................ 21
STEP 9 Mount The Thermostat .................................................................................................... 25
STEP 10 Check Thermostat Operation After Programming and Installing ............................. 26
STEP 11 Set the Fan and System Switches................................................................................ 29
Troubleshooting Guide................................................................................................................. 30
Index............................................................................................................................................... 34
Limited One-Year Warranty.......................................................................................................... 36
269-0733B—1
1
1
1
STEP 1 Prepare For Installation
■Check Table 1 to make sure this thermostat is compatible with your system. If not, return to retailer.
For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
TABLE 1—COMPATIBILITY CHART.
System Type Compatible with CT3400
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
Gas—Millivolt No
Oil-Fired Boilers Yes
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 line volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves
or 2-wire White Rodgers no. 1361 valves.

169-0733B—1
Table Of Contents
STEP 1 Prepare For Installation..................................................................................................... 2
STEP 2 Remove Old Thermostat ................................................................................................... 4
STEP 3 Before You Program.......................................................................................................... 6
Install the Batteries .................................................................................................................... 6
Adaptive Intelligent Recovery™ Selection .............................................................................. 7
STEP 4 Program The Thermostat .................................................................................................. 9
STEP 5 Mount Thermostat Wallplate........................................................................................... 16
STEP 6 Adjust System On-Length, Clock Display, as Required .............................................. 18
STEP 7 Adjust Fan Operation Switch, as Required ................................................................... 20
STEP 8 Wire Wallplate Terminals ................................................................................................ 21
STEP 9 Mount The Thermostat .................................................................................................... 25
STEP 10 Check Thermostat Operation After Programming and Installing ............................. 26
STEP 11 Set the Fan and System Switches................................................................................ 29
Troubleshooting Guide................................................................................................................. 30
Index............................................................................................................................................... 34
Limited One-Year Warranty.......................................................................................................... 36
269-0733B—1
1
1
1
STEP 1 Prepare For Installation
■Check Table 1 to make sure this thermostat is compatible with your system. If not, return to retailer.
For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
TABLE 1—COMPATIBILITY CHART.
System Type Compatible with CT3400
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
Gas—Millivolt No
Oil-Fired Boilers Yes
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 line volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves
or 2-wire White Rodgers no. 1361 valves.

369-0733B—1
■Acquire tools and items as needed (below).
CROSS-RECESSED
SCREWDRIVER HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED, TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED, TO STRIP WIRES MASKING TAPE, IF
NEEDED, TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED, TO LEVEL
THERMOSTAT FOR APPEARANCE
M878B
469-0733B—1
STEP 2 Remove Old Thermostat
■Disconnect wires from old thermostat or
subbase. As you disconnect each wire, use
masking tape to label it with the old terminal
designation. If there are only two wires, they do
not need to be labeled. Wrap wires around
pencil to keep them
from falling back into
the wall, as shown.
One or two extra
wires?
If you are replacing a
HoneywellChronotherm®Thermostat,youmay
find one or two wires that go to the clock termi-
nals on the Chronotherm thermostat wiring
wallplate.Donotallowthemtotouch,oryoucan
damageyour transformer. Disconnect thewires
■Test to make certain that your heating and
cooling systems are working properly. If either
does not work, contact your local heating/air
conditioning dealer. To avoid compressor dam-
age, do not operate the cooling system when
outdoor temperature is below 50°F [10°C].
■
Turn off power to system at the furnace, or
at the fuse/circuit breaker panel.
■Carefully unpack your new thermostat and
wallplate; save package of screws, instructions
and receipt.
■Removethecover from the old thermostat. If
it does not snap off when pulled firmly from the
bottom, check for a screw used to lock on the
cover.
■Loosen screws holding thermostat to sub-
base, wallplate or wall, and lift away.
WIRES THROUGH
WALL OPENING
M5136

369-0733B—1
■Acquire tools and items as needed (below).
CROSS-RECESSED
SCREWDRIVER HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED, TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED, TO STRIP WIRES MASKING TAPE, IF
NEEDED, TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED, TO LEVEL
THERMOSTAT FOR APPEARANCE
M878B
469-0733B—1
STEP 2 Remove Old Thermostat
■Disconnect wires from old thermostat or
subbase. As you disconnect each wire, use
masking tape to label it with the old terminal
designation. If there are only two wires, they do
not need to be labeled. Wrap wires around
pencil to keep them
from falling back into
the wall, as shown.
One or two extra
wires?
If you are replacing a
HoneywellChronotherm®Thermostat,youmay
find one or two wires that go to the clock termi-
nals on the Chronotherm thermostat wiring
wallplate.Donotallowthemtotouch,oryoucan
damageyour transformer. Disconnect thewires
■Test to make certain that your heating and
cooling systems are working properly. If either
does not work, contact your local heating/air
conditioning dealer. To avoid compressor dam-
age, do not operate the cooling system when
outdoor temperature is below 50°F [10°C].
■
Turn off power to system at the furnace, or
at the fuse/circuit breaker panel.
■Carefully unpack your new thermostat and
wallplate; save package of screws, instructions
and receipt.
■Removethecover from the old thermostat. If
it does not snap off when pulled firmly from the
bottom, check for a screw used to lock on the
cover.
■Loosen screws holding thermostat to sub-
base, wallplate or wall, and lift away.
WIRES THROUGH
WALL OPENING
M5136

569-0733B—1
Three thermostat wires?
If you have three wires for heating only and can
operate the fan using the fan ON switch, this
thermostatwillworkwithyoursystem.However,
some hot water (zoned) heating systems have
three thermostat wires. The thermostat will not
workwithoutinstallinganisolatingrelayonthese
systems.
and wrap them separately using electrical tape;
do not wrap them together . Place the wires
wheretheywillnotinterferewiththeoperationof
the new thermostat. Record the colors and ter-
minaldesignationlabelsoftheremainingwires.
Six or more wires?
If there are six or more wires (excluding clock
wires attached to terminals), you most likely
have a variation of a heat pump or multistage
system. The thermostat is
not compatible with
such systems so return the product to the place
of purchase.
669-0733B—1
STEP 3 Before You Program
M8388
INSTALL 3 AA ALKALINE
BATTERIES AS SHOWN,
POSITIVE (+) TERMINALS
TOWARD RIGHT.
BACK OF THERMOSTAT
Install the Batteries
IMPORTANT: Three AA alkaline batteries are
included with the thermostat. Batteries must
beinstalledforprogramming and operation of
the thermostat and heating/cooling system.
■Install the batteries in back of the thermostat
as shown, making sure positive (+) terminals all
face toward the right.
As the batteries are running low, a REPL BAT
indicator will flash for 1 to 2 months before bat-
teries run out completely. Replace the batteries
as soon as possible after the indicator starts
flashing.
If you insert new batteries within 20 to 30 sec-
ondsofremovingtheoldones,youwillnothave
to reprogram the thermostat. However, if the
display is blank, the batteries are dead or
incorrectly installed. In this case, you will
have to reprogram. See pages 13 through 15
to reprogram. If you do not reprogram, the
factory-prepro-
grammed
settings will be
in effect, as
shown in
chart on
pages 11
and 12.

569-0733B—1
Three thermostat wires?
If you have three wires for heating only and can
operate the fan using the fan ON switch, this
thermostatwillworkwithyoursystem.However,
some hot water (zoned) heating systems have
three thermostat wires. The thermostat will not
workwithoutinstallinganisolatingrelayonthese
systems.
and wrap them separately using electrical tape;
do not wrap them together . Place the wires
wheretheywillnotinterferewiththeoperationof
the new thermostat. Record the colors and ter-
minaldesignationlabelsoftheremainingwires.
Six or more wires?
If there are six or more wires (excluding clock
wires attached to terminals), you most likely
have a variation of a heat pump or multistage
system. The thermostat is
not compatible with
such systems so return the product to the place
of purchase.
669-0733B—1
STEP 3 Before You Program
M8388
INSTALL 3 AA ALKALINE
BATTERIES AS SHOWN,
POSITIVE (+) TERMINALS
TOWARD RIGHT.
BACK OF THERMOSTAT
Install the Batteries
IMPORTANT: Three AA alkaline batteries are
included with the thermostat. Batteries must
beinstalledforprogramming and operation of
the thermostat and heating/cooling system.
■Install the batteries in back of the thermostat
as shown, making sure positive (+) terminals all
face toward the right.
As the batteries are running low, a REPL BAT
indicator will flash for 1 to 2 months before bat-
teries run out completely. Replace the batteries
as soon as possible after the indicator starts
flashing.
If you insert new batteries within 20 to 30 sec-
ondsofremovingtheoldones,youwillnothave
to reprogram the thermostat. However, if the
display is blank, the batteries are dead or
incorrectly installed. In this case, you will
have to reprogram. See pages 13 through 15
to reprogram. If you do not reprogram, the
factory-prepro-
grammed
settings will be
in effect, as
shown in
chart on
pages 11
and 12.

769-0733B—1
IMPORTANT: Although the thermostat has a
low battery indicator, replace the batteries
once a year to prevent the thermostat and
heating/cooling system from shutting down
due to lack of battery power.
When leaving home for longer than a month, as
aprecaution,changebatteriesbeforeyouleave
topreventsystemfromshuttingdownduetolack
of battery power.
Use fresh alkaline batteries; nonalkaline bat-
teries will not last as long. We recommend
Energizer®batteries.
Adaptive Intelligent Recovery™
Selection
Before you program your thermostat, you must
decide if you want to leave the thermostat at
the factory-set Adaptive Intelligent Recovery™
setting, or adjust it to conventional recovery. If
youchooseconventionalrecovery,adjustscrew
3A (on the back of the thermostat) by turning
OUT one turn.
WithAdaptiveIntelligentRecovery™,yourhome
will reach the comfort temperature gradually to
be at the temperature you set at the exact time
programmed into the thermostat. Maximum en-
ergy savings and comfort will be achieved.
More about Adaptive Intelligent
Recovery™…
This thermostat is actually a small but powerful
computer. When calculating the exact time to
turnon your furnace or air conditioner,it consid-
ers: (1) air temperature, (2) the temperature of
the wall and (3) when you want the comfort
temperature established.
869-0733B—1
During recovery, the thermostat increases the
control temperature gradually and turns the
equipment on and off several times BEFORE
reaching your comfort time to save energy by
avoidingovershooting the comfort temperature.
You can see the current control temperature
anytime during recovery by pressing the CUR-
RENT SETTING key.
This smart control learns from experience. Each
day it checks how closely it hit the target and
adjusts the recovery start time accordingly. It
normallytakesFOURTOEIGHTDAYSAFTER
INSTALLATION for the thermostat to adjust to
the weather, your lifestyle, home construction
and heating/cooling system.
With conventional recovery, the programmed
time will mark the start of the time your furnace
or air conditioner comes on to start recovery;
therefore, you should program the start time to
be earlier than the desired comfort time. The
best starting time will vary as the seasons
change, but 30 minutes is a good head start
time to use.
NOTE: If you adjust screw 3A for conventional
recovery,a■indicatorwillappearinthelower
right corner of the thermostat display as a
reminder that you are
no longer using the
Adaptive Intelligent
Recovery™ feature.
PM
SET
PT
TUE
DAYTIME
INDICATES
THERMOSTAT IS SET FOR
CONVENTIONAL RECOVERY
M2483