Honeywell TD2400 User Manual
Programmable Thermostat
by Duracraft
OWNER’S GUIDE
Weekday/Weekend (5-day/ 2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model TD2400
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69-1120
M3701
MERCURY
SWITCH
Welcome to the world of comfort and energy
savings with your new Duracraft Programmable Thermostat.
Your new thermostat will automatically control
the temperature in your home, keeping you
comfortable while saving energy when programmed according to the instructions in this
manual.
Direct any questions concerning the application
of this thermostat to Duracraft Consumer
Services at 1-800-554-4558, Monday-Friday
7:00 a.m.-5:30 p.m., Eastern time.
RECYCLING THERMOSTAT
If this thermostat is replacing a thermostat that contains mercury in a sealed
tube, do not place your old thermostat in
the trash. Contact your local waste
management authority for instructions
regarding recycling and the proper
disposal of your old thermostat.
If you have questions, call Duracraft at
1-800-554-4558.
Fig. 1. Typical
location of a
mercury switch in
a thermostat.
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Table Of Contents
Step 1. Prepare For Installation ..................................................................................................... 4
Step 2. Remove Old Thermostat .................................................................................................... 6
Step 3. Install The Batteries ........................................................................................................... 7
Step 4. Program The Thermostat ................................................................................................ 10
Step 5. Adjust Fan Operation Switch, as Required.................................................................... 18
Step 6. Adjust System On-Time,
Step 7. Mount Thermostat Mounting Plate ................................................................................. 20
Step 8. Wire Thermostat 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 ............................................................................... 28
Troubleshooting Guide................................................................................................................. 30
Limited One-Year Warranty ............................................................................... Inside Back Cover
°F/°C, as Required .................................................................. 18
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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 Duracraft Consumer Services, toll-free 1-800-554-4558.
System Type Compatible With TD2400
Gas—Standing Pilot Yes
Gas—Electronic Ignition Ye s
Gas-Fired Boilers Yes
Gas—Millivolt No
Oil-Fired Boilers Yes
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Ye s
Baseboard Electric (120/240 Line Volt) No
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 3-wire thermostats for zone valves.
Not compatible with 2-wire White-Rodgers no. 1361 valves.
b
Compatible with hot water baseboard systems. Will not work efficiently on steam or gravity systems.
Table 1. Compatibility Chart.
4
a,b
a,b
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❑ Acquire tools and items as needed (below). Also purchase two AA alkaline batteries; we
recommend Energizer
®
batteries.
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
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE
5
MASKING TAPE, IF
NEEDED TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
M878B
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WIRES THROUGH
WALL OPENING
M5136
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
mounting plate; save package of screws,
instructions and receipt.
❑ Remove cover from 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
❑ Disconnect wires from old thermostat or
subbase, wallplate or wall, and lift away.
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. If there is an
extra wire that is not connected to your old
thermostat, you will also not be connecting it
to your new thermostat. Keep the wires from
falling back into the wall by wrapping them
around a pencil as shown.
Replacing a Clock Thermostat that has
C or C1 Clock 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
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Chronotherm® Thermostat wiring wallplate. Do
not allow them to touch, or you may damage
your transformer. Disconnect the wires and
wrap them separately, using electrical tape. Do
not wrap them together. Place the wires 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 not compatible with
such systems so return the product to the
place of purchase. If you would like information
about which programmable thermostats will
work with your system, call Duracraft Consumer Services at 1-800-554-4558.
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. For details,
call Duracraft Consumer Services at 1-800554-4558.
Step 3. Install the Batteries
IMPORTANT
Batteries must be installed for
programming and operation of the
thermostat and heating/cooling
system.
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❑ Purchase two AA alkaline batteries; non-
M12492
REMOVING
BATTERY
DOOR
BATTERY
DOOR COVER
alkaline batteries will not last as long, and
may leak, causing damage to the thermostat or the wall surface. We recommend
Energizer® batteries.
❑ Open the top cover of thermostat to access
control panel and battery compartment.
❑ Make sure the thermostat is set in the OFF
position.
❑ Use a coin to remove battery cover.
❑ Install the fresh batteries as shown, making
sure positive and negative terminals are
oriented correctly.
❑ Replace battery cover.
As the batteries are running low, a bAt Lo
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. If you do not replace the
batteries sometime during the flashing bAt Lo,
the indicator will eventually stop flashing. bAtLo will stay on without flashing, indicating the
thermostat and heating/cooling system have
stopped working when the batteries are almost
completely dead.
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After the batteries are completely dead, the
bAt-Lo indicator will disappear, leaving a
completely blank display.
the display is blank, the batteries are dead or
incorrectly installed and you will have to
reprogram. See pages 14 to 17 to reprogram.
Press down on left ends of batteries to remove.
If you insert the new batteries within 20 to 30
seconds of removing the old ones, you will not
have to reprogram the thermostat. However, if
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M1713
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.
As a precaution, when leaving home for longer
than a month, change batteries before you
leave to prevent system from shutting down
due to lack of battery power.
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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 20,
and return later to this programming section.
The personal programming chart on pages 12
and 13 may be helpful for planning your
program schedule of time and temperature
settings for various times of the day.
Four time periods are available during weekdays — WAKE, LEAVE, RETURN, and
SLEEP; these periods can be seen individually
on the display as you press the Weekday key.
• WAKE is the time period you want the
house at a comfortable temperature when
you get up and while you get ready for work
or school. (This will be a higher temperature
during heating season, or a lower temperature during cooling season.)
• LEAVE 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.)
• RETURN is the time period you want the
house at a comfortable temperature for
activities before bedtime. (Again, higher
heat or lower cool.)
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• SLEEP is the time period you can set for an
energy-saving temperature while you are
sleeping. (Again, lower heat or higher cool.
For more comfortable sleeping, some
people choose not to raise the cool temperature during the night.)
You will set one schedule for weekdays and
another for weekends, because your requirements will probably be different for each. Also,
during weekends, only the WAKE and SLEEP
time periods are available.
Fill in the times and temperatures you desire
for weekdays and weekends. If you decide not
to program the thermostat, it will automatically
control heating at 68°F (20°C), and cooling at
78°F (26°C), 24 hours a day. Also, you do not
need to enter a time and temperature program
for all periods if your schedule does not require
it. For example, a house that is occupied
during weekdays would only require programs
for WAKE and SLEEP.
If no program is entered for the weekends, the
thermostat will operate on the weekday SLEEP
program all weekend.
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. Using sharp
fingernails or pencil points can damage the
keypad.
If you make an error at any time during
programming, just press the Run Program key,
and continue again at the step where you left
off.
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