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By default, this thermostat has 4 separate program periods for both Heat and
Cool mode, they are: MORN, DAY, EVE, and NITE.  Each period ends at the
start time of the following period.  The heat programs are set in HEAT mode,
and the cool programs are set in COOL mode.

NOTE: If the thermostat is configured to use only 2 periods per day instead
of 4 (HARDWARE SETUP OPTIONS), the thermostat will only use the DAY
and NITE periods.  The MORN and EVE periods will not be visible on the
screen.

SET TEMPERATURE PROGRAMS:

Move the Set Slide switch to the TEMP

PROG position.  Programming will start with all 5 weekdays, Monday
through Friday (all grouped together).  Use the UP/DOWN buttons to adjust
the start time for the MORN period, then press the NEXT button to advance.
Use the UP/DOWN buttons to adjust the set temperature for the MORN
period, then press the NEXT button to advance.  Now adjust the start time
and set temperature for the DAY period, pressing the NEXT button after each
to advance.  Continue with these same steps to adjust the start times and set
temperatures for the EVE and NITE program periods.

When the NITE period is finished for the weekdays, the thermostat will
advance forward to the weekend program, with the MORN period start time
flashing. You will be setting the program periods for both Saturday and
Sunday (grouped together).  Perform the same steps that you used for
setting the weekday periods, pressing the NEXT button to advance through
each flashing value.  Return the Set Slide switch to the RUN position when
you are finished.

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TEMPERATURE PROGRAMS:

Summary of Contents for TX500U

Page 1: ... DAY PROGRAMMABLE THERMOSTAT FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS IMPORTANT Please read all of these instructions carefully before beginning installation Label every wire terminal designation on your existing thermostat wiring before removing your old thermostat Ignore the color of the wires since they may not comply with any standard Please connect w...

Page 2: ...s 1 5 Amps per terminal with a maximum total combined load of 3 0A for all terminals combined COMPATIBLE WITH Most 24 volt heating and cooling systems 1 or 2 stage Heat 1 stage Cool Gas Oil or Electric systems 1 or 2 stage Heat 1 stage Cool Heat Pump systems 3 wire hydronic hot water zone valves Gas Millivolt heaters NOT COMPATIBLE WITH 120 240 VAC line voltage systems without a transformer ask yo...

Page 3: ...lockout for unauthorized users Manual temperature hold Temporary temperature override Adjustable temperature differential cycle rate Adjustable 2nd heat stage Offset setting User temperature calibration Adjustable heat cool set temperature limit stops Smart recovery Dual powered battery and or 24 volt system powered Battery free memory storage F C temperature display 12 24 hour clock display 5 2 m...

Page 4: ... or construction work is still ongoing cover the thermostat completely or wait until this work is complete before installation WARNING All wiring must conform to the local codes and ordinances that are in your particular location 1 Turn OFF the electricity to all heating and cooling components Do not turn the electricity back on until all work is completed 2 Remove the front portion of your old th...

Page 5: ...s holes cannot be used hold the thermostat base against the wall so that it appears straight and level position the base for best appearance and mark for the new screw holes Attach the base to the wall using the screws provided use the supplied plastic anchors if needed when mounting to a soft material such as drywall CONNECTING THE WIRES When attaching the wires to the thermostat please ensure th...

Page 6: ...m using the System Common wire This can be used alone or in addition to installing batteries as a backup NOTE connecting the System Common wire to the thermostat is not necessary for heating and cooling to function properly If your old thermostat has both a Y and C wire both present then C is most likely a System Common wire For Heat Pump systems you will use either the O terminal or the B termina...

Page 7: ...ENTIONAL HEATING AND COOLING 11 1 STAGE HEAT 4 5 WIRES 5 CONVENTIONAL HEATING AND COOLING 12 2 STAGE HEAT 5 6 WIRES 6 CONVENTIONAL HEATING AND COOLING 13 TWO TRANSFORMERS 5 6 WIRES 7 HEAT PUMP HEATING AND COOLING 14 SINGLE STAGE ONLY 4 5 WIRES 8 HEAT PUMP HEATING AND COOLING 15 WITH AUX EMERGENCY HEAT 5 6 WIRES DIAGRAM SYSTEM TYPE DESCRIPTION PAGE WIRING DIAGRAMS ...

Page 8: ...ILLIVOLT 2 WIRE HEAT USE RH W1 Factory RH RC Jumper Wire Installed 1 2 3 4 5 WIRES C HEATER STAGE 1 STAGE 2 FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON FAN WIRE MAY NOT BE PRESENT IN ALL SYSTEMS NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L 8 ...

Page 9: ... WITH A 3 WIRE ZONE VALVE Factory RH RC Jumper Wire Installed 2 3 4 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC SYSTEM 24V TRANSFORMER SYSTEM COMMON OPEN Heat On CLOSE Heat Off 3 WIRE ZONE VALVE OPEN CLOSE O P T I O N A L 9 ...

Page 10: ...Y RC RH 1 STAGE COOLING ONLY Factory RH RC Jumper Wire Installed 3 C FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON 3 4 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L AIR CONDITIONER 10 ...

Page 11: ...L NON HEAT PUMP 1 STAGE HEATING AND 1 STAGE COOLING Factory RH RC Jumper Wire Installed 4 C FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON HEATER AIR CONDITIONER 4 5 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L 11 ...

Page 12: ...EAT PUMP 2 STAGE HEATING AND 1 STAGE COOLING Factory RH RC Jumper Wire Installed 5 C FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON AIR CONDITIONER 5 6 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L HEATER STAGE 1 STAGE 2 12 ...

Page 13: ...1 STAGE COOLING WITH TWO SEPARATE 24V TRANSFORMERS Factory RH RC Jumper Wire REMOVED 6 FAN HEAT 24V TRANSFORMER COOL 24V TRANSFORMER SYSTEM COMMON HEATER AIR CONDITIONER 5 6 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L 13 ...

Page 14: ...GENCY HEAT 7 C FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON 4 5 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L HEAT PUMP REVERSING VALVE Use O or B Terminals Never Both CUSTOMER INSTALLED Y W1 Jumper Wire Factory RH RC Jumper Wire Installed 14 ...

Page 15: ...HEAT PUMP SYSTEM WITH AUX AND EMERGENCY HEAT Factory RH RC Jumper Wire Installed 8 FAN SYSTEM 24V TRANSFORMER SYSTEM COMMON 5 6 WIRES NOTE THE BLACK TERMINAL LETTERS ARE TYPICAL GRAY TERMINAL LETTERS ARE BRAND SPECIFIC HEAT PUMP REVERSING VALVE Use O or B Terminals Never Both AUX EMERG HEAT O P T I O N A L 15 ...

Page 16: ...w describes the available choices for each option switch SWITCH 1 SYSTEM OFF DOWN FURN default This setting is used for the majority of all heating systems that are not heat pumps Examples for this setting would be natural gas furnace hot water baseboard heat and oil heat ON UP HP Use this setting if you have a heat pump unit which looks just like an outside air conditioning unit but is used for b...

Page 17: ...Y OFF DOWN 5 MIN default This sets the minimum length of time that Heat or Cool must remain either On or Off before it will automatically switch to the alternate On or Off state This internal delay prevents rapid cycling of your system and provides equipment protection particularly for cooling units The 5 minute setting is fine for most applications ON UP 2 MIN If you feel that your system may nee...

Page 18: ...n heat is called for and is required for heating systems that do not control their own fan while the thermostat is in HEAT mode Heat pump systems and units with an electric heating element typically require this setting Once the hardware options are set install two new Energizer or DURACELL AA size alkaline batteries Ensure that the batteries are installed in the proper direction as per the markin...

Page 19: ...s only operable when the thermostat is in Programmable mode When the thermostat is used in Manual control mode all 4 of the switch positions will act like the RUN position except the AIR FILTER position UP DOWN BUTTONS The UP and DOWN buttons are used to adjust any item that can be changed by the user Examples are the set temperatures clock times and days of the week In many cases an item may be f...

Page 20: ...in the RUN position one single press of the EMER button will activate Emergency Heat mode A single press again will end Emergency Heat mode and return back to normal Heat mode While in Emergency Heat mode the word EMER will also be shown in the middle portion of the display screen If a power loss occurs while in Emergency Heat mode the thermostat will continue to remain in Emergency Heat mode even...

Page 21: ...to prevent heating or cooling system damage which can occur from very frequent cycling If heating or cooling does not turn on right away with a manual change in set temperature please wait at least 5 minutes and the system should resume normal operation TEMPERATURE HOLD A Temperature Hold is used for maintaining a fixed set temperature Once a Hold is initiated the thermostat will maintain the set ...

Page 22: ...he start time for the MORN period then press the NEXT button to advance Use the UP DOWN buttons to adjust the set temperature for the MORN period then press the NEXT button to advance Now adjust the start time and set temperature for the DAY period pressing the NEXT button after each to advance Continue with these same steps to adjust the start times and set temperatures for the EVE and NITE progr...

Page 23: ...he RUN position Press and hold the HOLD button for at least 5 seconds The words SET and SWING will appear on the screen along with a single flashing digit Use the UP DOWN buttons to change the number value between 1 and 9 0 25F to 2 25F in 0 25F degree increments Number 1 is the default setting Press the NEXT button to accept the swing setting and proceed to the OFFSET setting TO CHANGE THE OFFSET...

Page 24: ...70 F Set Temperature 71 DEGREES F Only applies if a second heat stage is present 70 69 68 67 66 65 Swing Setting 2 0 5 F Cut In Cut Out 1st Stage 2nd Stage Cut In Cut Out Offset Setting 4 F degrees 24 ...

Page 25: ...is being applied Press the NEXT button to accept the setting TEMPERATURE LIMIT STOPS There are two independent set temperature limit stops a maximum heat set temperature and a minimum cool set temperature These stops do not prevent a user from performing normal actions like Temperature Override or Hold The Heat Limit Stop prevents the set temperature from being adjusted higher than the heat limit ...

Page 26: ...mperature limit Use the UP DOWN buttons to adjust the minimum cool set temperature value Press the NEXT button to accept the setting and return to the Normal Run screen in cool mode TO CHANGE THE TEMPERATURE STOP LOCK CODE Place the System Mode switch in the OFF position and the Set Slide switch in the RUN position Press and hold the NEXT button for at least 5 seconds The words STOP and LOCK CODE ...

Page 27: ...that use a blower fan and air ducts there is an air filter that is either replaceable or requires cleaning The filter is usually located in the air handler where the blower fan is This thermostat feature assists you with keeping track of proper maintenance and or periodic replacement intervals for your system s filter The Air Filter Monitor counts the duration of filter usage that has occurred sin...

Page 28: ... Hardware Setup Option switches and will perform an internal system check of the thermostat components If your thermostat appears to be acting in an erratic manner pressing the Hardware Reset button may remedy this behavior The temperature programs are not erased when a hardware reset is performed however the clock will have to be changed to match the current day and time SOFTWARE RESET The Softwa...

Page 29: ...o normal operation automatically This thermostat is powered by two AA Alkaline batteries The batteries should be replaced AT LEAST once per year to ensure reliable operation or sooner if the LOW BATT icon appears at the top of the display screen The batteries are located on the back of the thermostat at the top of the circuit board The front portion of the thermostat can be removed from the back h...

Page 30: ...lace it This warranty does not cover damage by accident misuse or failure to follow installation instructions Implied warranties are limited in duration to three years from the 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 location from which th...

Page 31: ... is replacing a thermostat that contains mercury in a sealed tube contact your local waste management authority for instructions regarding recycling and proper disposal It may be unlawful in your state to place it in the trash 31 MERCURY WARNING AND RECYCLING NOTICE ...

Page 32: ...Mt Laurel New Jersey 08054 USA http www luxproducts com 856 234 8803 32 HOLD 74F 72F 5 36P HEAT TU DAY SET ROOM FAN ...

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