Duracraft TD41 User manual

INSTALLATION INSTRUCTIONS
69-1122
FLAT BLADE
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 THEY
ARE DISCONNECTED FROM
OLD THERMOSTAT
SPIRIT LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE M849
®U.S. Registered Trademark
TD41
Heating/Air Conditioning Thermostat
The TD41 is for most gas or oil heat/
electric air conditioning systems.
Do-it-yourself model
Your New TD41 Thermostat
Your new TD41 Heating/Cooling Thermostat replaces
most 15 to 30V, 4-wire, heating/cooling system thermo-
stats. The TD41 is suitable for gas or oil heat/electric air
conditioning systems (not for heat pumps).
1 PREPARATION
You can properly install your new thermostat if you
follow the instructions step-by-step. It is
recommended that as you read, understand and complete
each step, you check √it off in the box with a pencil or
pen. If you are unsure about wiring procedures, please call
a qualified service technician for assistance.
Check thermostat suitability for your home’s system
by reviewing Your New TD41 Thermostat section.
Assemble tools required, as shown in illustration.
Make certain that your burner and air conditioner
(where applicable) are working, especially if they
were inoperative for any period of time. If either does not
work, contact your local heating/air conditioning dealer. Do
not operate the air conditioning system when outdoor
temperature is below 50°F (10°C).
Carefully unpack your new thermostat.
Save the package of screws and the instructions
pages.

69-1122 2
TD41 HEATING/AIR CONDITIONING THERMOSTAT
.18
.2
.25
3
.5
.7
.9
MOUNTING CLIPS
(FOR COVER)
TOP
MOUNTING HOLE
(THERMOSTAT
TO WALL OR
OUTLET BOX)
ADJUSTABLE
HEAT
ANTICIPATOR
SETTING LEVER
FAN SWITCH
SYSTEM SWITCH
BOTTOM
MOUNTING HOLE
MOUNTING CLIPS
(FOR COVER)
TEMPERATURE
SETTING LEVER
M11591
M3775
TERMINAL SCREWS M8067A
R
W
Y
G
2 THERMOSTAT FEATURES
3 REMOVE OLD THERMOSTAT
Begin by turning off power to the heating/air
conditioning system at the main fuse panel. Most
residential systems have a separate switch box or circuit
breaker for disconnecting power to the furnace.
Remove cover of old thermostat. Cover normally
snaps off when pulled firmly from the bottom; if it
resists, check for a screw that locks on the cover.
Before removing the old thermostat from the wall,
look at it carefully to locate the heat anticipator
adjustment mechanism. (See illustration in Step 2 to help
you recognize the heat anticipator.) Write here
the number of that anticipator setting for
future reference. The heat anticipator pointer, if adjustable,
is set at one of a series of numbers representing the
(electrical) current rating in amperes of the primary control
in your furnace. The number ranges from 0.18 to 1.0. If no
heat anticipator/indicator is showing, do not be concerned;
move on to the next step.
Loosen screws holding the thermostat base to the
subbase or wall, and lift away.
Disconnect wires from the old thermostat or
subbase. If your thermostat has more than two
wires, as you disconnect each wire, tape the end
and label it with the letter of the terminal designation
to allow easier reconnection to the new thermostat.
Take care that these wires do not fall back into the
wall opening.
Keep the old thermostat for reference until your new
thermostat is functioning smoothly.
4 WIRE AND MOUNT THERMOSTAT
Connect wires from the wall to the matching
terminals on the back of the thermostat. Tighten the
screws.
NOTE: If terminal designations on old thermostat do not
match those on the new thermostat, refer to the
following chart:
Push excess wire back into the wall and plug the
hole with nonflammable insulation to prevent drafts
from affecting thermostat operation.
Grasp the thermostat cover at both the top and the
bottom with one hand. Pull outward on the bottom
edge of thermostat cover until it snaps free of the thermo-
stat base.
Fasten the thermostat to the wall or vertical outlet
box with a screw through the top mounting hole.
See Step 2 for hole location.
Place a bubble level or plumb line against the
thermostat to find the level position. Start a screw in
the center of the bottom mounting hole. Move the tem-
perature setting lever, if necessary, to uncover the
mounting hole.
Old Thermostat
Terminal Marked Function
New Thermostat
Terminal Marked
G or F Fan G
Y or C Cooling Y
W or H Heating W
RC, V, VC or B Power You have a 5-wire
system and
cannot use this
thermostat; we
recommend a
CT87B instead.
RH, M, VR, 4, A
or R Power R

69-1122
3
TD41 HEATING/AIR CONDITIONINGTHERMOSTAT
M11592
.18
.2
.25
3
.5
.7
.9
BUBBLE LEVEL
PLUMB
LINE
PLUMB
BOB OR
WEIGHT
V8043E 1004 4
24V 50/60CY
.32 AMP @ 60CY
8406
24 Vac 50/60 Hz
0.4 AMP
30 VAC
0.2 AMP
T
F
T
F
OIL BURNER CONTROL
SHOWS
CURRENT
DRAW SHOWS
VOLTAGE
RATING
M6116B
FROM MAIN
FUEL SUPPLY
SHOWS
VOLTAGE
RATING TO
BURNER
SHOWS
ANTICIPATOR
SETTING
TYPICAL GAS VALVE
ZONE VALVE
SHOWS
VOLTAGE
RATING
SHOWS
ANTICIPATOR
SETTING
.18
.2
.25
3
.5
.7
.9
SCALEPLATE
M3784
ADJUSTABLE
HEAT
ANTICIPATOR
SETTING LEVER
Recheck for level positioning, and firmly tighten both
mounting screws.
Make sure you have the current draw anticipator
setting for your system. This is the number you
wrote down in Step 3. If you were unable to find the
current draw for Step 3, this information can be found
printed on the primary control at the furnace. The primary
control is usually a gas valve, zone valve, or a relay or
burner control box with the thermostat wires connected to
it. For electric heat, you need to add the fan relay current,
usually 0.2A to 0.4A.
Set the heat anticipator indicator at the rating printed
on the primary control.
Replace the cover by hooking it over the top of the
thermostat base and pressing the bottom in until it
snaps into place.
CAUTION
To prevent possible damage to the anticipator
(burn out).
Do not set the control too low. Do not allow thermo-
stat wires to short out at the the main control valve
on the furnace.
5 CHECK OUT THE THERMOSTAT
CAUTION
Prevent possible compressor damage.
Do not operate air conditioning when outdoor
temperature is below 50°F (10°C). Once the air
conditioner is off, do not turn it on for five minutes to
prevent compressor damage.
The system switch controls are:
HEAT: operates heating system only.
OFF: disconnects heating and air conditioning systems.
COOL: operates cooling system only.
The fan switch controls are:
AUTO: fan operates when heating or air conditioning
system operates.
ON: fan operates continuously.
NOTE: Please disregard heating or air conditioning
directions if not applicable to your system.
Turn on power to the heating/air conditioning
system.

69-1122 4
TD41 HEATING/AIR CONDITIONING THERMOSTAT
Observe system operation for at least one cycle on
both heating and air conditioning. To observe:
Place the system switch at the HEAT position and
the fan switch at AUTO. Move the temperature
setting lever 10°F (6°C) above room temperature. The
heating equipment should turn on. A short warmup period
may be required before the system fan turns on.
Place system switch at the COOL position and move
the temperature setting lever 10°F (6°C) below
room temperature. The air conditioning equipment should
turn on and the system fan should turn on.
NOTE: Some systems have a time delay that can
prevent operation up to five minutes.
Turn the fan switch to ON. The system fan should
turn on and operate continuously. The system
blower should continue to operate at any system switch or
thermostat setting.
6 THERMOSTAT SETTING
Place the system and fan switches at the desired
settings for operation.
7 TROUBLESHOOTING
Your Duracraft Thermostat requires little or no
attention; most problems occur as follows:
NOTE: If your system is heating-only or air conditioning-
only, disregard sections not applicable to your
system.
Sympton Problem Corrective Action
No heat System switch is at OFF or COOL
position. Move switch to HEAT position.
Blown fuse or tripped circuit
breaker. Replace fuse or reset circuit breaker.
Furnace power switch is at OFF. Switch to ON.
No pilot light. Relight pilot flame per furnace manufacturer
instructions.
Improper connections to
thermostat. With power to furnace off, tighten all mounting and terminal screws. Repair frayed
or broken wires.
Defective thermostat. (Here’s how
you know: Remove the thermostat
from the wall. Disconnect wire from
W terminal. Thermostat is
defective if the burner comes on.)
Exchange the thermostat (see Warranty).
Other. Contact a qualified service technician for
assistance.
No air conditioning System switch is in OFF or HEAT
position. Move switch to COOL position.
Blown fuse or tripped circuit
breaker. Replace fuse or reset circuit breaker.
Compressor switch (located
outdoors) is turned off. Move switch to ON position.
Improper connections to
thermostat. With power to furnace off, tighten all mounting and terminal screws. Repair broken
wires.
Defective thermostat. (Here’s how
you know: Remove the thermostat
from the wall. Disconnect wire from
Y terminal. Touch Y wire to
terminal R. Thermostat is defective
if the compressor starts. Some
systems have a time delay, so
allow at least five minutes.) See
Caution in Step 5.
Exchange the thermostat. See Warranty.
Other. Contact service technician for assistance.

69-1122
5
TD41 HEATING/AIR CONDITIONINGTHERMOSTAT
M11593
BACKSIDE
OF COVER
THERMOMETER
SHAFT
HEX HEAD
WRENCH
Sympton Problem Corrective Action
Furnace turns on and off. Burner on period is too short. Remove the thermostat cover and move the
heat anticipator counterclockwise one
scale mark. Replace the cover and wait
several hours for the system to stabilize.
Major swings in
temperature (greater than
2°F (1°C) when outside
temperature is stable).
Burner on period is too long. Remove the thermostat cover and move the
heat anticipator lever clockwise one
scale mark. Replace the cover and wait
several hours for the system to stabilize.
Thermostat setting and
thermometer reading
disagree.
Thermostat is not level. Recheck the thermostat position on the wall.
Use bubble level to make sure it is level. See
Step 4.
Thermostat affected by drafts or
radiant heat. Contact a qualified service technician to change the location. The thermostat should
be about 5 ft (1.5m) above the floor and on
an inside wall.
Thermostat is out of calibration. Contact a qualified service technician to
recalibrate the thermostat.
Thermometer is out of calibration. Recalibrate. See Step 8.
8 RECALIBRATE THERMOMETER
If the thermostat setpoint and the thermometer reading do
not agree, the thermometer may need recalibration. Follow
this procedure:
Remove the thermostat cover.
Set the cover on a table near an accurate
thermometer.
After allowing five or ten minutes for stabilization,
compare the readings.
If the readings are the same, replace the cover and
put the system into operation.
If the readings are different, insert a hex-head
wrench in the thermometer shaft and turn it until the
thermometers have the same reading.
Replace the cover and put the system into
operation.

69-1122 6
TD41 HEATING/AIR CONDITIONING THERMOSTAT
69-1122 R.T. 6-97 Printed in U.S.A.
250 Turnpike Road
Southborough, MA 01772
Limited One-Year Warranty
Duracraft Corporation 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, Duracraft shall repair or replace it (at Duracraft’s
option) within a reasonable period 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:
Duracraft Corporation
Consumer Services
250 Turnpike Road
Southborough, MA 01772
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Duracraft that
the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.
Duracraft’s sole responsibility shall be to repair or replace the product within the terms stated above. DURACRAFT 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 DURACRAFT 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 concerning this warranty, please write Duracraft Corporation, Consumer Services, 250 Turnpike
Road, Southborough, MA 01772 or call 1-800-544-4558. Monday-Friday, 7:00 a.m. to 5:30 p.m., Eastern time.