CT3400
PROGRAMMABLE
THERMOSTA T
Weekday/Saturday/Sunday
Programmable Heat and/or Cool
Thermostat and Wallplate
Honeywell/34
PROGRAMMING AND INSTALLATION
INSTRUCTIONS
Rev. 5-94 Printed in U.S. 69-0733B—1
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
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
the heat or air conditioning when you leave home or go to sleep.
■
Provides the ultimate in comfort and convenience
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.
by automatically calculating exactly when the furnace or air condition-
by remembering to automatically adjust
. It comes already programmed, so it’s your
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
1 69-0733B—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.
1
Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves
or 2-wire White Rodgers no. 1361 valves.
2 69-0733B—1
1
1
■ Acquire tools and items as needed (below).
CROSS-RECESSED
SCREWDRIVER
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED, TO STRIP WIRES
LEVEL, IF NEEDED, TO LEVEL
THERMOSTAT FOR APPEARANCE
3 69-0733B—1
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED, TO
DRILL HOLES IN WALL
MASKING TAPE, IF
NEEDED, TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
M878B
STEP 2 Remove Old Thermostat
■ 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 damage, 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.
■ Remove the cover 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.
■ 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
WIRES THROUGH
WALL OPENING
the wall, as shown.
One or two extra
wires?
If you are replacing a
Honeywell Chronotherm
®
Thermostat, you may
M5136
find one or two wires that go to the clock terminals on the Chronotherm thermostat wiring
wallplate. Do not allow them to touch, or you can
damage your transformer. Disconnect the wires
4 69-0733B—1
and wrap them separately using electrical tape;
do not wrap them together
where they will not interfere with the operation of
the new thermostat. Record the colors and terminal designation labels of the remaining wires.
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
such systems so return the product to the place
of purchase.
. Place the wires
not
compatible with
Three thermostat wires?
If you have three wires for heating only and can
operate the fan using the fan ON switch, this
thermostat will work with your system. However,
some hot water (zoned) heating systems have
three thermostat wires. The thermostat will not
work without installing an isolating relay on these
systems.
5 69-0733B—1
STEP 3 Before You Program
Install the Batteries
IMPORTANT:
included with the thermostat. Batteries must
be installed for programming 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 batteries run out completely. Replace the batteries
as soon as possible after the indicator starts
flashing.
Three AA alkaline batteries are
If you insert new batteries within 20 to 30 seconds of removing the old ones, you will not have
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-preprogrammed
BACK OF THERMOSTAT
settings will be
in effect, as
shown in
chart on
pages 11
and 12.
INSTALL 3 AA ALKALINE
BATTERIES AS SHOWN,
POSITIVE (+) TERMINALS
M8388
TOWARD RIGHT.
6 69-0733B—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.
the factory-set Adaptive Intelligent Recovery™
setting, or adjust it to conventional recovery. If
you choose conventional recovery, adjust screw
3A (on the back of the thermostat) by turning
OUT one turn.
When leaving home for longer than a month, as
a precaution, change batteries before you leave
to prevent system from shutting down due to lack
of battery power.
Use fresh alkaline batteries; nonalkaline batteries 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
With Adaptive Intelligent Recovery™, your home
will reach the comfort temperature gradually to
be at the temperature you set at the exact time
programmed into the thermostat. Maximum energy 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
turn on your furnace or air conditioner, it considers: (1) air temperature, (2) the temperature of
the wall and (3) when you want the comfort
temperature established.
7 69-0733B—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
avoiding overshooting the comfort temperature.
You can see the current control temperature
anytime during recovery by pressing the CURRENT SETTING key.
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.
This smart control learns from experience. Each
day it checks how closely it hit the target and
adjusts the recovery start time accordingly. It
normally takes FOUR TO EIGHT DAYS AFTER
INSTALLATION for the thermostat to adjust to
the weather, your lifestyle, home construction
and heating/cooling system.
NOTE: If you adjust screw 3A for conventional
recovery, a ■ indicator will appear in the lower
right corner of the thermostat display as a
reminder that you are
no longer using the
Adaptive Intelligent
Recovery™ feature.
INDICATES
THERMOSTAT IS SET FOR
CONVENTIONAL RECOVERY
TUE
DAYTIME
PM
M2483
8 69-0733B—1
SET
PT
STEP 4 Program The Thermostat
After the batteries are installed, the thermostat
can be easily programmed in your hand before
it is installed on the wall.
If you would prefer to program the thermostat
after it is installed on the wall, skip to page 16,
and return later to this programming section.
The following personal programming chart
(pages 11 and 12) may be helpful when planning your program schedule of time and temperature settings for various times of the day.
Four time periods are available—MORNING,
DAYTIME, EVENING and NIGHT. Each
period has its own setting key.
MORNING is the time period you want the
house at a comfortable temperature, after you get up, while you get ready for
work or school. (This will be a higher
temperature during heating season, or a
lower temperature during cooling season.)
DAYTIME is the time period you can set for an
energy-saving temperature while you are
away at work or school. (This will be a
lower temperature during heating season,
or a higher temperature during cooling
season.)
EVENING is the time period you want the
house at a comfortable temperature for
activities before bedtime. (Again, higher
heat or lower cool.)
9 69-0733B—1
NIGHT is the time period you can set for an
energy-saving temperature while you are
sleeping. (Again, lower heat or higher cool.
Although for more comfortable sleeping,
some people choose not to raise the cool
temperature during the night.)
control to these settings. The thermostat requires a time and temperature program for the
MORNING period. You can program DAYTIME
and EVENING, or leave them blank. You can
also change NIGHT or cancel it (see page 15),
as you please.
You will set one schedule for weekdays, one for
Saturday, and another for Sunday, because
your requirements will probably be different for
each.
Fill in the times and temperatures you desire for
weekdays, Saturday, Sunday. The factory-preprogrammed time and temperature settings are
shown in parentheses. If you decide not to
program the thermostat, it will automatically
PROGRAMMING
Before programming, remove the clear plastic
overlay covering the display.
When pressing the keys, use the ball of your
finger or a soft pencil eraser. Use of sharp fingernails or pencil points may damage the keypad.
If at any time during programming you make an
error, just press the RUN PROGRAM key, and
continue again at the step where you left off.
10 69-0733B—1
Personal Programming Chart
Weekday Program
START HEATING COOLING
1
1
PERIOD TIME TEMPERATURE TEMPERATURE
(6:00 AM) (70° F [21° C]) (78° F [26° C])
MORNING
_____________________ _____________________ _____________________
DAYTIME ______________ ______________ _____________
EVENING ______________ ______________ _____________
NIGHT _____________________ _____________________ _____________________
(10:00 PM) (60° F [16° C]) (78° F [26° C])
Saturday Program
START HEATING COOLING
1
1
PERIOD TIME TEMPERATURE TEMPERATURE
MORNING _____________________ _____________________ _____________________
(6:00 AM) (70° F [21° C]) (78° F [26° C])
DAYTIME ______________ ______________ _____________
EVENING ______________ ______________ _____________
NIGHT _____________________ _____________________ _____________________
(10:00 PM) (60° F [16° C]) (78° F [26° C])
11 69-0733B—1
Sunday Program
START HEATING COOLING
11
PERIOD TIME TEMPERATURE TEMPERATURE
MORNING
(6:00 AM) (70° F [21° C]) (78° F [26° C])
_____________________ _____________________ _____________________
DAYTIME ______________ ______________ _____________
EVENING ______________ ______________ _____________
NIGHT
1
The temperatures cannot be set any higher than 88° F [31° C] or any lower than 45° F [7° C].
(10:00 PM) (60° F [16° C]) (78° F [26° C])
_____________________ _____________________ _____________________
NOTE: The factory-preprogrammed time and temperature settings are shown in parentheses.
PROGRAMMING
13
12 69-0733B—1
When programming your new thermostat, use this guide. Batteries are required for programming
and operation.
SET PRESENT DAY
Press and release then until present day shows.
SET PRESENT TIME
Press and release then until present time shows.
HEATING PROGRAM
With system switch at HEAT, press and release . Use and to
Set
Present
Day/Time
Set
Present
Day/Time
Day
Time
a
Morning
Time
a
Temp
a
program Mon-Fri MORNING time and temperature. Repeat using DAYTIME, EVENING, NIGHT keys.
For Saturday, press to SAT. Press and release ; use and
Temp
a
to program Saturday morning time and temperature. Repeat using DAYTIME, EVENING,
Day
Morning
Time
a
NIGHT keys.
For Sunday, press to SUN. Repeat steps as you did for SAT.
Day
13 69-0733B—1
COOLING PROGRAM
The times you have set for heating will stay the same for cooling; you will only program the
temperatures.
With system switch at COOL, press and release . Use to program Mon-Fri
Morning
Temp
a
MORNING temperature. Repeat using DAYTIME, EVENING, NIGHT keys.
For Saturday, press to SAT. Press and release ; use to program
Day
Morning
Temp
a
Saturday morning temperature. Repeat using DAYTIME, EVENING, NIGHT keys.
For Sunday, press to SUN. Repeat steps as you did for SAT.
Day
After programming, adjust fan and system switches as desired.
Run
Press and release to start the program.
a
Press onto move number back; press onto move number ahead.
Program
14 69-0733B—1
PROGRAMMING
For operating or making changes, use this guide.
TempaTemp
Temporarily Change temperature for current period only— ; will cancel itself at next
Run
Temp
Evening
Program
a
Night
Run
Program
scheduled change, or to cancel sooner you may press .
Hold
Hold a temperature indefinitely— , ; to cancel, press .
Check current temperature setting— .
Cancel a program—Press and hold , or three seconds to cancel.
Temp
Current
Setting
Daytime
Morning cannot be cancelled (only changed).
Permanently Change a program—Repeat steps under Heating Program (page 13) or Cooling
Program (page 14), as applicable.
Return to normal program or start program— .
a
Press onto move number back; press onto move number ahead.
Run
Program
15 69-0733B—1
STEP 5 Mount Thermostat Wallplate
■ Position wallplate on wall. Use a spirit level
to make sure wallplate is level. Use a pencil to
mark two of the mounting holes that best fit
the application.
WALL
ANCHORS
(2)
1
USE THE TWO MOUNTING HOLES THAT BEST FIT APPLICATION.
16 69-0733B—1
WALL
WIRES THROUGH
WALL OPENING
WALLPLATE
INSTALLATION
MOUNTING
HOLES (3)
MOUNTING
SCREWS (2)
1
M5932
■ Remove wallplate from wall, and drill
3/16 inch holes in wall (if drywall) as marked.
For firmer material such as plaster or wood,
drill 7/32 inch holes. Gently tap anchors
(provided) into drilled holes until flush with the
wall.
■ Reposition wallplate over holes, pulling
wires through wiring opening. Loosely insert
two mounting screws into holes.
■ Level for appearance only; thermostat will
function properly even when not level. Tighten
mounting screws.
SPIRIT LEVEL
M611A
17 69-0733B—1
STEP 6 Adjust System On-Length, Clock Display, As
Required
■ The thermostat on-length is factory-set for
a warm air, gas or oil heating system. If you are
installing it on another type of system, the onlength must be adjusted accordingly by setting
screws 1A and 1B on the back of the thermostat, using the heating system table in the
figure as a guide. The on-length should be
optimized with the type of system to minimize
If on-length screws 1A,1B are adjusted For longer on-length, readjust
to match this system: screws 1A,1B to match this system:
electric warm air gas/oil warm air
gas/oil warm air hot water or high efficiency
hot water or high efficiency gravity air/water
room temperature swings. Setting the screw out
one turn means turning the screw approximately 360°, or about one complete turn.
In the rare event that you want a longer onlength, you may readjust the screws as follows,
but be aware that you may be increasing room
temperature swings at the same time.
18 69-0733B—1
INSTALLATION
IMPORTANT:
When using a high efficiency
furnace such as a 90% or greater AFUE
(Average Fuel Utilization Efficiency) unit, adjust screw 1A in and screw 1B out one turn.
■ The thermostat is set to display the time as a
12-hour clock and the temperature in degrees
Fahrenheit. If a 24-hour clock (e.g., military
time) or degrees Celsius readings are desired,
adjust screws 2A and 2B as necessary using
the figure as a guide.
■ For an explanation of the Recovery Selection
screws (3A), see pages 7 and 8.
RECOVERY
SELECTION
ADAPTIVE
INTELLIGENT
CONVENTIONAL
TM
(FACTORY SETTING)
1 TURN
3A
IN
OUT
BACK OF THERMOSTAT
1A
3A
1B
2A 2B
1A
SYSTEM
GRAVITY
AIR/WATER
HOT
WATER
OR HIGH
EFFICIENCY
(90%+AFUE)
GAS/OIL
WARM AIR
ELECTRIC
WARM AIR
1B
OUT
OUT
1 TURN
1 TURN
OUT
IN
1 TURN
IN IN
(FACTORY SETTING)
OUT
1 TURN
IN
DISPLAY
12 hr./ °F
24 hr./ °F
24 hr./ °C
12 hr./ °C
2A 2B
OUT
OUT
(FACTORY SETTING)
OUT
IN
IN
OUT
M 618A
IN
IN
19 69-0733B—1
STEP 7 Adjust Fan Operation Switch, As Required
■ The thermostat fan operation switch is fac-
tory-set in the NON ELEC position. This is the
correct setting for most systems. If your system
is an electric furnace, set the switch to the
ELEC position. The ELEC position will allow the
fan to turn on immediately with the heating or
cooling system if the G terminal is connected to
a fan relay.
NOTE: Either the switch must be set before the
batteries are installed, or the left battery
must be removed to access the switch.
4A
20 69-0733B—1
BACK OF THERMOSTAT
FAN OPERATION SWITCH
(SHOWN IN NON ELEC POSITION)
INSTALLATION
M619C
STEP 8 Wire Wallplate Terminals
NOTE: All wiring must comply with local codes
and ordinances. If unsure about household
wiring procedures, call your local heating/air
conditioning contractor.
Refer to masking tape 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 figures on
pages 23 and 24 and Table 2 for typical wire
colors for easy matching.
Thermostat Connect to
Terminal Wire Color
a
Wire colors are typical; verify at heating/cooling
equipment connection.
In 5-wire installations only, be sure to remove the factory-installed jumper connecting terminals R and Rc.
21 69-0733B—1
TABLE 2—TYPICAL WIRE COLORS
AND FUNCTIONS.
a
Function
G Green Fan
Y Yellow Cooling
W White Heating
Rc Blue Air Conditioning
R Red Furnace Power
Power
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