LUX SMART TEMP TX250 Series - ELECTRONIC THERMOSTAT Manual

INTRODUCTION

READ INSTALLATION INSTRUCTIONS FIRST
To obtain the best results from your investment, please read these instructions and acquaint yourself with your purchase before installing your new thermostat. Then follow the installation procedures, one step at a time. This will save you time and minimize the chance of damaging the thermostat and the systems it controls.
These instructions may contain information beyond that required for your particular installation.
Please save for future reference.

FEATURES

• The TX250 can be Liquid Crystal used with most 24 Display volt gas, oil or Thermostat Fan Switch electric heating Body and air conditioning systems, single stage heat pumps or gas millivolt heating systems. It cannot be used with 120 volt heating Reset systems or multistage Button heat pumps. Ask your dealer for other LUX thermostats to control those systems.
• The TX250 is Tabs Speed programmable. Slide There are four programming periods per day. Each period can be programmed separately.
• Easy to use Speed Slide.
• You can use the built-in time/temperature programs, or alter them to suit your schedule. The TX250 provides separate programming for weekdays and weekends — for both heating and cooling. You can override the programmed temperatures for as little as one programming period or for an entire vacation.
• In cool weather, when the system switch is set to HEAT, the TX250 may maintain cooler "set back" room temperatures to save energy. It will then change to warmer "comfort" settings — automatically, at specified times during the day.
• In warm weather, when the system switch is set to COOL, the TX250 may maintain warmer "set back" room temperatures to save energy. It will then change to cooler "comfort" settings — automatically, at specified times during the day.
• A liquid crystal display shows time, day of the week, and room and set temperatures.
• Temperature swing adjustment lets you fine-tune your system for maximum comfort and economy.
• A 2 or 5-minute minimum off time in COOL prevents your air conditioning system from being damaged.
• Two Energizer ® or DURACELL ® "AA" alkaline batteries (not included) are used to retain your time and temperature programs.

INSTALLATION

To avoid electrical shock and to prevent damage to the furnace, air conditioner, and thermostat, disconnect the power supply before beginning work. This can be done at the fuse box, at the circuit breaker, or at the appliance.

Please read all instructions carefully before beginning installation.

TOOLS REQUIRED
#1 Phillips screwdriver (small)
Drill with 3/16-in. (4.8mm) bit

THERMOSTAT LOCATION
On replacement installations, mount the new thermostat in place of the old one unless the conditions listed below suggest otherwise. On new installations, follow the guidelines listed below.

1. Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the floor, and ina room that is used often.
2. Do not install it where there are unusual heating conditions, such as: in direct sunlight; near a lamp, radio, television, radiator, register, or fireplace; near hot water pipes in a wall; near a stove on the other side of a wall.
3. Do not locate in unusual cooling conditions, such as: on a wall separating an unheated room; or in a draft from a stairwell, door, or window.
4. Do not locate in a damp area. This can lead to corrosion that will shorten thermostat life.
5. Do not locate where air circulation is poor, such as: in a corner or an alcove; or behind an open door.
6. Do not install the unit until all construction work and painting has been completed.
7. This thermostat does not require leveling.

REMOVING THE OLD THERMOSTAT
Switch electricity to the furnace and air conditioner OFF; then proceed with the following steps.

Read instructions carefully before removing any wiring from existing thermostat. Wires must be labeled before they are removed. When removing wires from their terminals, ignore the color of the wires since these may not comply with the standard.

1. Remove cover from old thermostat. Most are snap-on types and simply pull off. Some have locking screws on the side. These must be loosened.
   
2. Note the letters printed near the terminals. Attach labels (enclosed) to each wire for identification. Remove and label wires one at a time. Make sure the wires do not fall back inside the wall.
3. Loosen all screws on the old thermostat and remove it from the wall.

MOUNTING THE TX250 ON THE WALL

1. Strip insulation 3/8 in. (9.5mm) from wire ends and clean off any corrosion.
   
   

2. Fill wall opening with non-combustible insulation to prevent drafts from affecting the thermostat.
   
   

3. Cup and hold thermostat body and left tab in place with left hand. Separate tabs with right hand.

Be careful not to drop the body or disturb electronic parts.

NOTE
If you are mounting the base to a soft material like plasterboard or if you are using the old mounting holes, the screws may not hold. Drill a 3/16-in. (4.8mm) hole at each screw location, and insert the plastic anchors provided. Then mount the base as described below.

ATTACHING WIRES

4. Hold the base against the wall, with the wires coming through wherever it is convenient for wiring. Route the wires to the terminal block. Position the base for best appearance (to hide any marks from an old thermostat). Attach the base to the wall with the two screws provided.
   

WIRING DIAGRAMS

INSTALLING BATTERIES/ MAINTENANCE

The TX250 requires batteries to operate your furnace and retain its programming in memory. Replace the batteries when the REPLACE indicator appears in the display or at least once a year.

REPLACE BATTERIES WHEN INDICATOR APPEARS OR AT LEAST ONCE A YEAR.

5. Align the top of the body onto the base and press together.

Installation is now complete. Be sure to turn the power back on to your heating and /or air conditioning system. If this is the first time you are installing batteries, the thermostat will display "SUN 12:00 AM". Within 90 seconds the thermostat will begin to display the room temperature alternately with the time. To correct the display, see "Setting the TIME and DAY," after you set the programs.

PROGRAMMING CHART

THE BUILT-IN ENERGY STAR^® PROGRAMS
Push in the RESET key. This sets the default heating and cooling programs. To review the default programs, move the Speed Slide to SET WEEKDAY or SET WEEKEND.
You can use the default 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.

PROGRAMMING THE TX250
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.

Select HEAT to program the TX250 for controlling your heater.
OR
Select COOL to program the TX250 for controlling your air conditioner.

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.

	To change the start time for MORN.		To change the start time for EVE.
	To program temperature.		To program temperature.
	To change the temp. setting for MORN.		To change the temp. setting for EVE.
	To move to DAY.		To move to NIGHT.
	To change start time for DAY.		To change the start time for NIGHT.
	To program temperature.		To program temperature.
	To change the temp. setting for DAY.		To change the temp. setting for NIGHT.
	To move to EVE.	Move Speed Slide to RUN position to start the programs.

SETTING THE TIME AND DAY

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.

To change current day.

To set current time. The (e.g. "12:00") will be flashing.

To change the current time.

TEMPERATURE OVERRIDE AND TEMPERATURE HOLD
TEMPORARY TEMPERATURE OVERRIDE
These features let you change the current Set Temperature without changing the programs stored in your thermostat's memory.

• 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.
• To cancel OVERRIDE prior to next program period press UP/DOWN until original set temperature appears. OVERRIDE indicator will disappear from display.

TEMPERATURE HOLD

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."
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.

SWING SETTINGS

Speed Slide must be in the run position

	Press together
	To change swing
	Press to set.

CHANGING FROM °F TO °C AND A 12HR CLOCK TO A 24HR CLOCK

• 
  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.
• Located to the left of the circuit board are three black jumpers C/F and 24/12H.
• To change to Celsius - remove jumper - JP2.
• To change to a 24HR clock - remove jumper- JP1.
• Press the reset key on the front of the thermostat for changes to take effect.
• Reprogram as necessary.

5 MIN/2 MIN MINIMUM ON/OFF TIME
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.

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. The number is (856) 234-8803 or visit our online technical support at www.luxproducts.com.

LUX PRODUCTS CORPORATION
Philadelphia, PA 19112

Use Energizer^® or DURACELL^® Alkaline Batteries Only.
Energizer^® is a registered trademark of Eveready Battery Company, Inc. DURACELL^® is a registered trademark of The Gillette Company, Inc.