TEMPERATURE HOLD
• Press HOLD. Adjust temperature as
desired with UP/DOWN.
• Temperature setting will not change even
after next program period begins.
• To clear, press HOLD again.
MO
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This thermostat is “armchair programmable”
You can make any program or setting
changes with the thermostat body off or on
the wall thermostat base.
OPERATION
66
DAY
HOLD
The TX250 alternately displays the
current time and the room
PM
HOLD
temperature. It also displays the day of
the week and the currently active
program period that is controlling the temperature: MORN, DAY, EVE, or NITE.
The set point temperature will appear in the right side of the display. In the winter, set the
system switch to HEAT to control your heating system. In the summer, set the switch to
COOL to control your air conditioner. In spring and fall or when windows are open, you can
set the system switch OFF.
ADVANCED FEATURES
TEMPERATURE SWING
A thermostat works by turning your heating or cooling system on and off whenever the
room temperature varies a certain number of degrees from the set-point temperature. This
variation is the “swing.”
N
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Setting the FAN switch to AUTO
automatically runs your system’s fan
during heating and cooling. Setting
the FAN switch to ON runs your
The FAN switch works only if your system
provides a wire for the TX250’s “G” terminal.
Your system should cycle on about 3 to 6 times per hour. A smaller swing number
increases the number of cycles, so room temperature is more constant. Setting “1” is
approximately 1/4°F. Each increase of 1 value increases the swing by approximately 1/4°F.
A larger swing number decreases the number of cycles, and may save energy in some
cases.
system’s fan continuously even without heating or cooling.
®
THE BUILT-IN ENERGY STAR PROGRAMS
Push in the RESET key. This
PERIOD
HEAT
COOL
sets the default heating and
cooling programs. To review the
default programs, move the Speed
Slide to SET WEEKDAY or
SET WEEKEND.
HOLD
NEXT
Press together
SWING SETTINGS
WEEKDAYS
preprograms
MORN
DAY
EVE
6:00 AM 70° 6:00 AM 78°
8:00 AM 62° 8:00 AM 85°
6:00 PM 70° 6:00 PM 78°
SET TEMP SWING
Speed Slide must
be in the run
position
To change
swing
DOWN
UP
NEXT
Press to set.
You can use the default
NIGHT 10:00 PM 62° 10:00 PM 82°
programs as shown, or change
them as you wish. Each day is
divided into four periods. Each
period has its own starting time
and temperature.
MORN
DAY
6:00 AM 70° 6:00 AM 78°
8:00 AM 62° 8:00 AM 85°
6:00 PM 70° 6:00 PM 78°
WEEKEND
W
A
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N
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N
G
preprograms
EVE
Making these changes will require you to reset the thermostat. Copy any of your customized
programs onto the blank chart. This will be your reference to re-enter the programs afterwards.
NIGHT 10:00 PM 62° 10:00 PM 82°
PROGRAMMING THE TX250
CHANGING FROM °F TO °C AND A 12HR CLOCK TO A 24HR CLOCK
You can change any preset times and/or temperatures to suit your schedules for the
weekday and weekend programs. Each period (Morning, Day,
Evening, and Night) is programmed for HEAT and for COOL.
MO TU WE TH FR
MORN
•
WARNING: Making these changes will
require you to reset the thermostat. Copy
any of your customized programs onto
the chart below. This will be your
reference to reenter the programs
afterwards.
H
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T
AM
HEAT
OFF
OPEN CLOSE
Select HEAT to program the
TX250 for controlling your heater.
OR
Select COOL to program the
TX250 for controlling your air conditioner.
COOL
JP3 2MIN 5MIN
•
Located to the left of the circuit board
are three black jumpers C/F and 24/12H.
To change to Celsius - remove jumper
JP2
C
F
Slide the Speed Slide to SET WEEKDAY PROGRAM. To program the weekends SET
WEEKEND. With Slide on SET WEEKDAY PROGRAM, you will see the display above.
•
JP1 24HR 12HR
- JP2.
JP3
•
To change to a 24HR clock - remove
JP2
JP1
jumper- JP1.
To change the start
time for MORN.
To change the start
time for EVE.
To program temperature.
DOWN
DOWN
UP
UP
•
Press the reset key on the front of the
thermostat for changes to take effect.
• Reprogram as necessary.
NEXT
UP
NEXT
UP
To program temperature.
To change the temp.
setting for MORN.
To move to DAY.
To change start time
for DAY.
To change the temp.
DOWN
DOWN
setting for EVE.
To move to NIGHT.
To change the start
time for NIGHT.
To program temperature.
To change the temp.
setting for NIGHT.
5 MIN/2 MIN MINIMUM ON/OFF TIME
NEXT
UP
NEXT
UP
Your thermostat has an internal timer built in to protect your compressor. The timer forces
a minimum on/off time of 5 minutes. You may change this minimum on/off time to 2 minutes.
To accomplish this, remove the jumper labeled JP3. You must press the small reset
button on the face of the thermostat for the changes to take effect.
DOWN
DOWN
NEXT
UP
NEXT
UP
To program temperature.
DOWN
DOWN
To change the temp.
setting for DAY.
To move to EVE.
TECHNICAL SERVICE
If you have any problems installing or using this thermostat, please reread the instructions carefully.
Technical Service is available through our Technical Service Number. If you require assistance, please
call our offices between 8:00 a.m. and 4:30 p.m. Eastern Standard Time, Monday through Friday.
NEXT
Move Speed Slide to RUN position to
start the programs.
SETTING THE TIME AND DAY
WARRANTY
C
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MO
Limited Warranty: If this unit fails because of defects in materials or workmanship within one year of
date of original purchase, LUX will, at its option, repair or replace it. This warranty does not cover
damage by accident, misuse, or failure to follow installation instructions. Implied warranties are limited in
duration to one year from date of original purchase. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not apply to you. Please return malfunctioning or
defective units to the participating retailer from which purchase was made, along with proof of
purchase. Please refer to Technical Service Section before returning thermostat.
The TX250 is protected against normal static electric discharges.
However, in extremely dry weather you should touch another metal
object before the TX250 to avoid potential loss of programs.
PM
Move the Speed Slide to SET DAY/TIME position. You should see the display pictured
above with a day of the week flashing. When you are finished setting the day and time,
rotate the dial to RUN to return to normal operation or to another position to continue
programming.
Purchaser assumes all risks and liability for incidental and consequential damage resulting from
installation and use of this unit. Some states do not allow the exclusion of incidental or consequential
damages, so the above exclusion may not apply to you. This warranty gives you specific legal rights and
you may also have other rights which vary from state to state. Applicable in the U.S.A. only.
UP
To change
current day.
To set current time. The (e.g.
“12:00”) will be flashing.
To change the
current time.
UP
NEXT
DOWN
These features let you change the current
Set Temperature without changing the programs
stored in your thermostat’s memory.
TEMPERATURE OVERRIDE AND
TEMPERATURE HOLD
TEMPORARY
•
•
•
Press UP/DOWN to change the current temperature
setting. The OVERRIDE indicator appears on display.
The OVERRIDE feature will be automatically canceled
at the start of the next program period.
TEMPERATURE OVERRIDE
MO
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T
UP
To cancel OVERRIDE prior to next program period press
UP/DOWN until original set temperature
DAY
PM
DOWN
OVERRIDE
appears. OVERRIDE indicator will disappear from display.
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
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