Programmable Thermostat
Y
T
S
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Congratulations on the purchase of your new thermostat!
More than 100 years of Honeywell engineering produced
this thermostat that can provide you with a more
comfortable and convenient living environment.
Your new thermostat automatically controls the
temperature in your home, keeping you comfortable
while saving energy when programmed according to
these instructions.
Direct questions about this thermostat to our Web site at
www.honeywell.com/yourhome or call the customer
information line at 1-800-468-1502.
Programmable Heat and/or Cool
CT3451
OWNER’S GUIDE
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of it properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control.
1 PREPARE FOR INSTALLATION
❑ Check Table 1 to make sure this thermostat is
compatible with your system. If not, return it to the
retailer.
❑ Acquire tools and items, as needed. See Fig. 1.
SCREWDRIVER
WIRE CUTTER/STRIPPER IF NEEDED TO STRIP WIRES
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
YPICAL LOCATION OF A MERCURY
WITCH IN A THERMOSTAT
® U.S. Registered Trademark
Copyright © 2003 Honeywell • •All Rights Reserved
MERCUR
SWITCH
M10614
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE
Fig. 1. Required installation tools/supplies.
69-1620-1
M20551
CT3451 PROGRAMMABLE THERMOSTAT
H
2 REMOVE OLD THERMOSTAT
❑ Test to be sure your heating and air conditioning
systems (where applicable) are working correctly. If
not, contact your local heating/air conditioning dealer.
To avoid compressor damage, do not operate the
Table 1. Compatibility Chart.
System Type Compatible With CT3451
Gas—standing pilot Yes
Gas—electronic ignition Yes
Gas-fired boilers
Gas—750 millivolt Yes
Oil-fired boilers
Oil-fired furnace Yes
Electric furnace Yes
Electric air conditioning Yes
Single stage heat pumps (no backup or auxiliary heat) Yes
Baseboard electric (120/240 line volt) No
Multistage heat pumps/multistage equipment No
Not compatible with any 120/240 volt circuit.
a
Compatible with 2-wire Honeywell zone valves. Isolating relay required for zone valves that have a 3-wire thermostat
connection.
cooling system when outdoor temperature is below
50°F (10°C).
a
Yes
a
Yes
Replacing Clock WIth C or C1 Clock
CAUTION
Equipment Damage Hazard.
Handling wires during installation can
damage equipment.
Disconnect power at furnace or main breaker/
fuse box before beginning installation.
❑ Carefully unpack your new thermostat and wallplate
and save package of screws, instructions and receipt.
❑ Remove the cover from the old thermostat. If it does
not snap off when pulled firmly from the bottom, check
for screw that locks on the cover.
❑ Loosen screws holding thermostat to subbase,
wallplate or wall and lift away.
❑ Disconnect wires from old thermostat or subbase. As
you disconnect each wire, use the wiring labels
(enclosed) to label each wire with the old terminal
designation. If there are only two wires, they do not
require labeling. Wrap wires around a pencil to keep
them from falling back into the wall as shown in Fig. 2.
WIRES THROUG
WALL OPENING
Terminals
If you are replacing a Honeywell Chronotherm®
Thermostat, you may find one or two wires that go to the
C or C1 clock terminals on the Chronotherm®
Thermostat wiring wallplate. Do not allow them to touch,
or you can damage your transformer. Disconnect the
wires and wrap them separately using electrical tape; do
not wrap them together. Do not place the wires where
they can interfere with the new thermostat operation.
Record the colors and terminal designation labels of the
remaining wires.
Six or More Thermostat Wires
If there are six or more wires connected to the thermostat
(excluding clock wires attached to terminals), you
probably have a variation of a multistage heat pump or
other multistage system. The thermostat is not
compatible with these systems, so return the product to
your retailer. If you want information about which
programmable thermostats work with your system, visit
our Web site at www.honeywell.com/yourhome or call the
customer information line at 1-800-468-1502.
M5136
Fig. 2. Wrapping wires around pencil.
69-1620—1 2
Three Thermostat Wires
If you have three wires for heating only and can operate
the fan using the Fan On switch, this thermostat works
with your system. However, some hot water (zoned)
heating systems have three thermostat wires. The
thermostat works only if a contractor installs an isolating
relay on these systems. For details, contact a local
heating/cooling contractor.
CT3451 PROGRAMMABLE THERMOSTAT
T
S
)
7
,
3 MOUNT WALLPLATE
IMPORTANT
Level for appearance only. The thermostat functions normally even when not mounted level.
❑ Position the wallplate on the wall. Level the wallplate
for appearance, if desired. Use a pencil to mark the
two mounting holes that best fit the application. See
Fig. 3.
WALL
MOUNTING
SCREWS (2)
1
WHEN USING WALL ANCHORS, DRILL 3/16 INCH
HOLES FOR DRYWALL, 7/32 INCH HOLES FOR
PLASTER OR WOOD.
Fig. 3. Mounting wallplate to wall.
❑ Remove the wallplate from the wall and drill two 3/16-
in. holes in the wall (if drywall). For firmer wall material
such as plaster or wood, drill 7/32-in. holes. Gently tap
provided anchors into the drilled holes until flush with
the wall.
❑ Reposition the wallplate, pulling wires through the
wiring opening. Loosely insert the mounting screws
into the holes.
❑ Level for appearance only; the thermostat functions
correctly even when not level. Tighten the mounting
screws.
WALL
ANCHORS (2)
1
WALLPLATE
M12202A
ERMINAL
CREW
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM
G
Rc
R
W
B
Y
Fig. 4. Connecting wiring.
NOTE: To ensure correct mounting of thermostat,
restrict all wiring to the shaded area in the center of the terminals.
❑ Loosen the terminal screws and slip each wire
beneath its matching terminal. The shape of the
terminals permit insertion of straight or wraparound
connections. See Fig. 5. Tighten the terminals.
O
M12559A
FOR WRAPAROUND, STRIP
7/16 IN. (11 mm)
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 mm)
4 WIRE WALLPLATE TERMINALS
All wiring must comply with local electrical codes and
ordinances. If unsure about household wiring
procedures, call your local heating and air conditioning
contractor.
Refer to the labels you placed on wires when you
removed your old thermostat.
❑ Match the letter of your old thermostat wire with the
terminal of the corresponding letter on your new
thermostat. Refer to Fig. 4.
M1253
Fig. 5. CT3451 methods for wiring connection.
❑ Plug the hole in the wall with insulation to help prevent
drafts from adversely affecting thermostat operation.
The CT3451 Thermostat is powered with 3AA alkaline
batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 6 through 10 for typical
system wiring diagrams.
3 69-1620—1
CT3451 PROGRAMMABLE THERMOSTAT
THERMOSTAT
THERMOSTAT
S
7
THERMOSTAT
)
THERMOSTAT
G
Rc
3
R
W
Y
HEAT
RELAY
1
L1
(HOT)
L2
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
2
PUMP SYSTEMS.
3
JUMPER R TO Rc.
Fig. 6. Typical heat-cool system hookup with single
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. Typical heat system hookup with 2-wire, heat-
FAN
RELAY
1
G
Rc
R
W
Y
COMPRESSOR
CONTACTOR
transformer.
B
O
HEATING
RELAY AND
FAN COIL
24V
only system.
B
O
COOL
DAMPER
M20536
2
HEAT
DAMPER
M20510
G
Rc
R
W
Y
2
1
Fig. 8. Typical cool system hookup with 3-wire,
1
L1
(HOT)
L2
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER
SYSTEM.
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
Fig. 9. Typical heat-cool system hookup with two
B
O
COOLIING
24V
CONTRACTOR
COIL
1
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEAN
AND OVERLOAD PROTECTION AS REQUIRED.
cool-only system.
G
Rc
R
2
W
Y
3
FAN
COOL
RELAY
DAMPER
COMPRESSOR
CONTACTOR
HEAT
RELAY
transformers.
B
O
3
HEAT
DAMPER
FAN
COIL
M2053
HEATING
TRANSFORMER
1
L1
(HOT
L2
M20511
69-1620—1 4
T8002 THERMOSTAT
G
Rc
3
R
W
4
2
CHANGEOVER
B
O
COOL
VALVE
Y
FAN
RELAY
COMPRESSOR
1
L1
(HOT)
L2
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER Y TO W.
2
3
JUMPER R TO Rc.
4
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
CONTACTOR
HEAT
CHANGEOVER
VALVE
M20512
CT3451 PROGRAMMABLE THERMOSTAT
❑ Swing down the thermostat and press the lower edge
of the thermostat onto the wallplate to latch. See Fig.
12.
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
Hold
Select
FAN
Auto On
SYSTEM
Cool Off Heat
A
ENGAGE T ABS AT TOP OF THERMOSTA T
WITH SLOTS ON WALLPLATE.
Fig. 10. Typical single-stage heat pump system
hookup.
5 ADJUST FAN OPERATION
SWITCH
The thermostat fan operation switch, labeled fuel switch
in Fig. 11, is set at the factory in the F (gas/oil fuel)
position. This is the correct setting for most systems. If
you have an electric heat system, set the switch to the E
(electric) position. The E setting allows the fan to turn on
immediately with the heating equipment in a system
where the G terminal is connected.See Fig. 11.
E
F
FAN OPERATION (FUEL) SWITCH
M20530
Fig. 11. Fan operation (fuel) switch.
6 MOUNT THERMOSTAT TO
WALLPLATE
❑ Slide System switch to the Off position.
❑ Engage the tabs at the top of the thermostat and
wallplate.
PM
T
U
E
FAN
Auto On
PRESS LOWER EDGE OF
B
CASE TO LATCH.
Hold
Select
S
Y
Cool Off Heat
S
T
E
M
M20513
Fig. 12. Mounting thermostat to wallplate.
7 INSTALLING AND REPLACING
BATTERIES
The thermostat requires three AA alkaline batteries to
operate:
❑ Remove the battery door, located on the right side of
the thermostat, by pulling outward from the bottom.
See Fig. 13.
❑ Insert three AA alkaline batteries as shown in Fig. 13.
NOTE: The thermostat shows a “bAtLo” message on
the digital display to alert the homeowner one to
two months before the batteries run out completely.
IMPORTANT
Homeowner should replace the batteries once a
year to prevent leakage and/or the heating/cooling system from shutting down due to lack of
battery power in the thermostat.
5 69-1620—1
CT3451 PROGRAMMABLE THERMOSTAT
A
3
A
A
A
1
AA BATTERIES (3)
— Release the keys to display the three-digit soft-
ware revision code. (Information displayed varies
by model).
Auto On
PM
T
U
E
FAN
Hold
Select
S
Y
Cool Off Heat
S
T
E
M
M20514
Fig. 13. Installing batteries.
❑ Restore power to the heating/cooling system.
8 CUSTOMIZE YOUR THERMOSTAT
Your Honeywell thermostat comes preset to the most
commonly used settings:
— Temperature (°F).
— Gas or oil forced air furnace.
— Aggressive algorithm control.
You can change these settings using the instructions that
follow. To exit at any time, press the ▲ key until End
displays.
Setting °F/°C Indication, Heat Cycle Rate,
Heating/Cooling Temperature Control
The following instructions provide information to change
the heating cycle rate to match the heating equipment
and to choose either the Fahrenheit (°F) or Celsius (°C)
display.
NOTE: All four steps must be completed to save
changes to the °F/°C indication and the heat
cycle rate.
❑ Enter Installer Setup.
— Use ▼ or ▲ keys to set the temperature setpoint
to 52°F (11°C).
M1258
— Press the ▲ key. FC (factory configuration) dis-
plays. (A typical example is shown, but information displayed varies by model. This information
is for factory use only.)
M12584
❑ Setting °C or °F.
— Press the ▲ key again to display the current
setting.
— Press the ▼ key to change the °C or °F indication.
❑ Setting Heat Cycle Rate (see Table 2 for the cycle rate
options and equipment).
— Press the ▲ key to display the current heat cycle
rate setting of 1, 3, 4, 5, 9, or 12 cph.
M12589
— If the desired cycle rate is displayed, press the ▲
key to display heating and cooling algorithm
default.
— To change the heat cycle rate, press the ▼ key
until your choice of 1, 3, 4, 5, 6, 9, or 12 is displayed.
— Press the ▲ key to display the heating and
cooling temperature control algorithm configuration default.
M12588
SET
HT.
M12582
— Press ▼ and ▲ keys simultaneously for more
than two seconds to enter Installer Setup.
69-1620—1 6
M1469
— Press the ▼ key to change the heating and cool-
ing control algorithm to C1 or C3.
C1 = Standard control algorithm.
C3 = Aggressive control algorithm (Default. Can
cause overshooting.)
CT3451 PROGRAMMABLE THERMOSTAT
2
A
4
0
— Press the ▲ key. Current configuration (CC) is
displayed. A typical example is shown, but CC
varies by model. (This information is for factory
use only.)
❑ Exit Installer Setup.
— Press the ▲ key to save all changes and return to
normal operation.
PM
M1469
M12590A
Table 2. Heating Cycle Rate.
System Cycle Per Hr
Steam, gravity 1
Hydronic heat, condensing gas
a
furnaces
3
Gas or oil forced air (default) 6
Electric heat 9
Special applications 4, 5, 12
a
High efficiency furnace (90+).
b
Refer to the equipment manufacturer’s instructions.
9 PROGRAM YOUR THERMOSTAT
The thermostat is preprogrammed for your convenience
with the following time and temperature settings; see
Table 3. See energy saving charts at the end of this
document for energy-saving information.
Table 3. Preprogrammed Time
and Temperature Settings.
Period Time
Heat
Setpoint
Wake 6:00 AM 70°F (21°C) 78°F (26°C)
Leave 8:00 AM 62°F (17°C) 85°F (29°C)
Return 6:00 PM 70°F (21°C) 78°F (26°C)
Sleep 10:00 PM 62°F (17°C) 82°F (28°C)
Wake is the time period when you want the house at a
comfortable temperature when you get up in the morning.
Cool
Setpoint
NOTE: The heating and cooling program times are the
same. Changing your cooling Wake time also
changes your heating Wake time.
Leave is the time period you can set for an energy saving
temperature while you are away from home during the
day.
Return is the time period when you want the house at a
comfortable temperature when you come home during
the day.
Sleep is the time period when you can set an energysaving temperature while you are sleeping.
IMPORTANT
Always press the keys with your fingertip or similar blunt tool. Sharp instruments like pens and
pencil points can damage the keyboard.
Setting Current Time and Day
1. To set current time, press Select twice. Press ▼
or ▲ key to set current time.
NOTE: While setting the current time, the word SET is
displayed.
SET
PM
M12591
2. To set day of week, press Select again. Press▼
or ▲ key to set current day.
SET
M1853
To use the preprogrammed time and temperature
settings (see Table 3), press Hold to exit the
programming mode.
Setting Weekday Program
Slide the System switch to the position, Heat or Cool,
that you want to program. A flame (heating) or a
snowflake (cooling) appears in the right side of the
display, when setting the program temperature.
1. Wake
a. Press Select. Press ▼ or ▲ key to set Wake
time.
SET
b. Press Select. Press ▼ or ▲ key to set Wake
temperature.
M1857
7 69-1620—1
CT3451 PROGRAMMABLE THERMOSTAT
C
6
B
7
B
8
C
8
9
0
1
2
3
SET
2. Leave.
a. Press Select. Press ▼ or ▲ key to set Leave
time.
M12625
Setting Saturday and Sunday Programs
To set the Saturday program:
1. Wake
a. Press Select. Press ▼ or ▲ key to set Wake
time.
SET
SET
M1856
b. Press Select. Press ▼ or ▲ key to set Leave
temperature.
SET
M12627
3. Return
a. Press Select. Press ▼ or ▲ key to set Return
time.
SET
b. Press Select. Press ▼ or ▲ key to set Return
temperature.
SET
4. Sleep
a. Press Select. Press ▼ or ▲ key to set Sleep
time.
M1856
M12629
M2055
b. Press Select. Press ▼ or ▲ key to set Wake
temperature.
SET
M2055
2. Leave
a. Press Select. Press ▼ or ▲ key to set Leave
time.
SET
M2056
b. Press Select. Press ▼ or ▲ key to set Leave
temperature.
SET
M2056
3. Return
a. Press Select. Press ▼ or ▲ key to set Return
time.
SET
SET
M1856
b. Press Select. Press ▼ or ▲ key to set Sleep
temperature.
SET
M12631
69-1620—1 8
M2056
b. Press Select. Press ▼ or ▲ key to set Return
temperature.
SET
M2056
CT3451 PROGRAMMABLE THERMOSTAT
4
5
6
8
A
A
4. Sleep
a. Press Select. Press ▼ or ▲ key to set Sleep
time.
SET
M2056
b. Press Select. Press ▼ or ▲ key to set Sleep
temperature.
SET
M2056
5. Repeat steps 1-4 in Setting Saturday and Sunday
Program section to set the Sunday program.
6. Press Select. End is displayed. Programming is
complete. The thermostat reverts to displaying the
current day time and temperature in five seconds.
SET
M1855
7. Repeat programming steps to set heat or cool
program, as desired.
10 OPERATE YOUR THERMOSTAT
Displaying Temperature Setting
❑ Press ▼ or ▲ key once to display present
temperature setting. After approximately five seconds,
the thermostat displays the current time and room
temperature.
TEMPORARSET Y
M2053
Setting Temporary Temperature Hold
❑ Press ▼ or ▲ key to set a temporary temperature
setting.
TEMPORARY
PM
WED
NOTE: The temporary temperature setting remains in
effect until the next program period. To cancel,
press Hold twice.
M12640
Setting Indefinite Temperature Hold
The Hold key allows you to indefinitely hold a
temperature. When Hold is active, the letters Hld are
displayed continuously. Hold can be canceled by
pressing the Hold key again.
❑ Press Hold.
❑ Press ▼ or ▲ key to set indefinite temperature
setting.
M12641
11 SET FAN AND SYSTEM
SWITCHES
Manually control Fan and System settings using the
switches located at the bottom of the thermostat case.
See. Fig. 14 for switch locations.
PM
TU
E
FAN
Auto On
Fig. 14. Time/temperature display and System/Fan
Fan Switch
❑ The Fan switch settings are:
On: The fan runs continuously. Use for
improved air circulation.
Auto: Normal setting for most homes. In cooling,
the fan starts and stops with the cooling equipment. In heating, the fan is controlled directly by
the heating equipment and starts a few minutes
after the heating equipment turns on (on most
systems). When the thermostat fuel switch is
set to the E position for electric heat, the fan
starts and stops with the heating equipment.
❑ Slide the Fan switch on the thermostat to the desired
fan setting.
Hold
S
Y
Cool Off Heat
switches.
Select
S
T
E
M
M20515
9 69-1620—1
CT3451 PROGRAMMABLE THERMOSTAT
System Switch
❑ The System switch settings control thermostat
operation as follows:
Cool: The thermostat controls the cooling
system.
Off: Both heating and cooling are off.
Heat: The thermostat controls the heating
system.
❑ Slide the System switch on the thermostat to the
desired system setting.
Heat and Cool Indicators
indicates a call for heat.
indicates a call for cool.
NOTE: In the programming mode, the and
the indicate System setting.
Minimum Off-Timer
The thermostat minimum off-timer assures that the
compressor does not come on again for at least five
minutes after it turns off.
The minimum off-timer is triggered when the compressor
turns off and when the System switch position is
changed. If the compressor turns off when the setpoint is
changed, the minimum off-timer is triggered.
A flashing snowflake indicates the minimum off-timer
is in effect.
12 CHECK OPERATION AFTER
INSTALLATION/PROGRAMMING
Heating System
❑ Slide the System switch to Heat and the Fan switch to
Auto.
❑ Press and hold the ▲ key to raise the temperature
several degrees above the room temperature to start
the heating equipment. When using the thermostat
with the Fuel switch set to the E position for electric
heat, the fan starts immediately.
❑ Press the ▼ key to lower the temperature setting
below the room temperature. The heating equipment
should shut down.
Cooling System
CAUTION
Compressor Damage Hazard.
Operating at too low of an outdoor
temperature can cause compressor damage.
Do not operate cooling if outdoor temperature is
below 50°F (10°C).
Allow compressor to remain off for five minutes
before restarting.
Refer to manufacturer’s recommendations.
1. Slide the System switch to Cool and the Fan switch
to Auto.
2. Press the ▼ key to lower the temperature setting
several degrees below the room temperature; the
cooling equipment should start. The fan starts and
stops with the cooling equipment.
NOTE: If the cooling system does not start immediately,
remember that the thermostat has a built-in minimum off-time of five minutes to protect the compressor.
3. Press the ▲ key to raise the temperature setting
above the room temperature. Cooling system
should shut down.
Fan
❑ Slide the System switch to Off and the Fan switch to
On. The fan should run continuously.
❑ Slide the Fan switch to Auto. The fan should turn off.
Backlighting
❑ Press any key to light the display for approximately
ten seconds.
69-1620—1 10
CT3451 PROGRAMMABLE THERMOSTAT
TROUBLESHOOTING
Table 4. Frequently Asked Questions.
If ... Then ...
Display does not come on. Make sure the batteries are fresh and installed correctly.
Temperature display does not go lower than
40°F (4°C) or higher than 99°F (37°C during
programming.
Display shows flashing or steady “bAtLo.” The batteries are low; replace them as soon as possible.
Temperature change occurs at the wrong
time.
Heating does not come on. • Check that the System switch is set to Heat.
Cooling does not come on. • Check that the System switch is set to Cool.
The furnace cycles too frequently or the
system cycle length is too short or too long.
The thermostat current setting does not
match the displayed room temperature to
within plus or minus 1°.
System on indicator ( = heat; = cool) is
lighted, but no warm or cool air is coming
from the registers.
Thermostat backlight appears dim. • Wait until Replace Battery indicator is illuminated and replace
System on indicator is flashing.
Your thermostat has reached the temperature limit. Be sure the
setting range is from 40°F to 99°F (4°C to 37°C).
Check the program times for the period in question. Be sure that
AM and PM indications are correct. Make sure the current day and
time are correct. Reprogram if necessary.
• Check the system fuse or circuit breaker and replace or reset, if
necessary.
• Check for correct wiring and good connections.
• If display is blank or displays “bAtLo,” install fresh batteries.
• Allow time for the furnace to heat up and the fan to come on
before checking for heat at the register.
• If the temperature setting is higher than the current room
temperature and the flame is displaying, the thermostat is
operating correctly. Contact a heating contractor for assistance.
• Check the system fuse or circuit breaker and replace or reset, if
necessary.
• Check for correct wiring and good connections.
• If display is blank or says “bAtLo,” install fresh batteries.
• The thermostat has a built-in time delay on cooling. Allow five to
ten minutes after changing the setting before the air conditioner
starts.
• If the temperature setting is lower than the current room
temperature and the snowflake is displaying, the thermostat
is operating correctly. Contact an air conditioning contractor for
assistance.
Adjust heat cycle rate in the Customize Your Thermostat section.
• Plug the wiring hole in the wall behind the mounting plate with
insulation to prevent drafts that can adversely affect thermostat
operation.
• Be aware that it is normal for the current setting and the
displayed room temperature to differ occasionally.
• During recovery from setback or setup, setting and displayed
room temperatures can differ for up to 30 minutes after recovery
period.
Wait five minutes after seeing the flame or snowflake and check
the registers again. If there is no hot or cool air coming from the
registers, refer to “Heating does not come on” or “Cooling does not
come on.” If everything is checked contact you heating and air
conditioning contractor.
batteries.
• Replace batteries now.
• MInimum off-timer is in effect. Wait five minutes until the
minimum off-timer is complete.
11 69-1620—1
CT3451 PROGRAMMABLE THERMOSTAT
L
.
M12545
PERCENT OF HEATING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9 TO 11%
12 TO 13%
14 TO 15%
16 TO 18%
PERCENT OF COOLING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
7TO 9%
10 TO 11%
12 TO 14%
14 TO 19%
*
YOUR SAVINGS DEPENDS ON HOME SIZE AND
ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC
LOCATION, FREQUENCY OF TEMPERATURES
CHANGE, AND RANGE IN DEGREES OF CHANGE
HEAT
COO
Limited One-Year Warranty
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of
one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall
repair or replace it (at Honeywel l’s option) within a reasonable p eriod of time.
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or
(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid,
to the following address:
Honeywell Return Goods Canada: Honeywell Limited/Honeywell Limitée
Dock 4, MN10-3860 Product Services ON15
1885 Douglas Dr N 35 Dynamic Dr
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was
caused by damage which occurred while the product was in the possession of a consumer.
Honeywell’s sole responsibility sh all be to repair or replace the pro duct within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY
LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY,
FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED
WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO
THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation
may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
If you have any questions concernin g this warranty, please write
Honeywell Customer Relations, 1985 Douglas Dr N, MN10-1461, Golden
Valley, MN 55422. In Canada, write Retail Products ON15,
Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough,
Ontario M1V 4Z9.
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
69-1620—1 J.S. 05-03 www.honeywell.com/yourhome
M1V 4Z9
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
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