Lux Products TX500E Instruction Manual
Contents
1. SYSTEMES DE CHAUFFAGE CLIMATISATION 4 0U 5 FILS ET UN TRANSFORMATEUR CAVALIER FOURNI RHyRC Y W G SYSTEMES DE CHAUFFAGE CLIMATISATION 5 OU 6 FILS ET DEUX TRANSFORMATEURS CAVALIER RETIRE RHI RC YW G C BLAGE POUR POMPE DE CHALEUR MONO TAG E CAVALIER RC RH CAVALIER l FOURNI al PAR LE CLIENT RHTRC Y W G SISTEMAS DE CALEFACCION SOLAMENTE SE INCLUYE LA CONEXION DE PUENTE RHyRC Y W G 0 OPTIONNEL OPTIONNEL UTILISER B OU 0 MAIS NON LES DEUX SISTEMAS DE AIRE ACONDICIONADO SOLAMENTE SE INCLUYE LA CONEXION DE PUENTE 0 B peas PA OPCIONAL SISTEMAS DE CALEFACCION AIRE ACONDICIONADO 4Y 5 ALAMBRES CON UN TRANSFORMADOR SE INCLUYE LA CONEXION DE PUENTE nul RC YW G dis SISTEMAS DE CALEFACCION AIRE ACONDICIONADO 5 Y 6 ALAMBRES CON DOS TRANSFORMADORES CONEXION DE PUENTE RETIRADA minc v w e 0 B CABLEADO TIPICO DE UNA BOMBA DE CALOR DE UNA FASE SE INCLUYE CONEXION CONEXION DE PUENTE DE PUENTE RC RH RC y w G 0 B PROVISTA POR EL CLIENTE i He R USE B U 0 PERO NO AMBOS TYPICAL 2 3 OR 4 WIRE 24 VOLT HEATING ONLY SYSTEMS AND MILIVOLT HEATING SYSTEMS RH RC Y W G O6 TYPICAL 32. when the Temperature mode switch is in the OFF position to provide air circulation only NOTE The Fan mode switch only works if your system provides a wire for the thermostat s G wire terminal PUSH BUTTONS There are four primary push buttons on the front of the thermostat The UP and DOWN arrow keys the NEXT button and the HOLD button ROTARY DIAL The LUX Speed Dial provides an easy way to quickly navigate between the different programming areas This rotary dial has five individual positions OPERATING INSTRUCTIONS SET DAY TIME Rotate the dial to the SET DAY TIME position You should see the word SET appear on the display along with the clock and a day of the week that is flashing With the day flashing press the UP button to advance the day to the desired day Press the NEXT button this should cause the time to start flashing and the day to remain on steady Using either the UP or DOWN buttons adjust the clock to the desired time The clock digits will increment rapidly if either the UP or DOWN buttons are held in the pressed position HEATING AND COOLING Basic operation of your heating or cooling system can be obtained by ensuring that the rotary dial is in the RUN position and simply moving the Temperature mode switch to either the HEAT or COOL position Prior to being set initially with your custom temperature program and also after a Software Reset the thermostat will follow the default Energy Star approved temper
3. by the tabs at the top corners of the base then snap the bottom of the unit into place Do not use unnecessary force If the body does not snap into place easily remove the body re hang it from the tabs and try again TECHNICAL ASSISTANCE If you have any problems installing or using this thermostat please carefully and thoroughly review the instruction manual If you require assistance please contact our Technical Assistance department at 856 234 8803 during regular business hours between 8 00AM and 4 30PM Eastern Standard Time Monday through Friday You can also receive technical assistance online anytime day or night at http www luxproducts com Our web site offers you answers to the most common technical questions and also permits you to email your questions to our technical support staff at your convenience WARRANTY Limited Warranty If this unit fails because of defects in materials or workmanship within three years of the 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 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 the purchase was made along with proof of purch
4. may shorten thermostat life 6 If painting or construction work has yet to be completed cover the unit completely or do not install it WARNING e Read instructions carefully before removing any wires from your existing thermostat e This thermostat should be limited to 1 5 amps per terminal and a maximum of 2 amps total higher current than this may cause damage to the thermostat All wiring must conform to the local codes and ordinances that are in your particular location REMOVAL OF OLD UNIT 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 cover and front portion of your old thermostat to expose the wiring connections 3 Write down the letters printed near each wire terminal that is used and the color of the wire that is connected to it Using the enclosed labels attach a label to each of your wires so that the letter matches the marking on your existing thermostat When they are all labeled carefully remove the wires one at a time making sure that they do not fall back inside the wall Do not allow any of the bare wire ends to touch each other or any parts on the thermostat 5 Loosen all of the screws on the old thermostat and remove it from the wall A MOUNTING 1 Strip insulation leaving 3 8 in 9 5mm bare wire ends and clean off any corrosion Fill wall opening with non combustible insulation to prevent
5. mode the display will count down the percentage of air filter life remaining before a filter change is recommended In the Days mode the display will count down the number of calendar days remaining before a filter change is recommended Switch position OFF is Percent mode and ON is Days mode FRONT PANEL ITEMS SOFTWARE RESET The software reset is a small recessed push button that is located right above the NEXT button This button can be pushed with a pencil or the end of a paper clip This reset clears all of the heating and cooling programs filter settings and other user changeable preferences to their default values You should write down your heating and cooling program times and temperatures prior to using the software reset MODE SWITCHES There are two mode switches on the front a Temperature mode switch and a Fan mode switch The Temperature mode switch has three positions HEAT OFF and COOL 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 the spring and fall or when the windows are open you can set the switch OFF The Fan mode switch has two positions AUTO and ON Setting the Fan mode Switch to AUTO automatically runs your system s blower fan as required only during heating and cooling activation Setting the Fan mode switch to ON runs your system s fan continuously even if heating or cooling is not needed including
6. pushing the NEXT button through all four periods to review your entries or turn the dial to RUN if you are finished These same programming steps for all four periods must be performed in both Heat and Cool Temperature modes independently SET WEEKEND PROGRAM Turn the dial to WEEKEND PROGRAM You will be programming both Saturday and Sunday at the same time You will begin with the start time of the MORN period and use the same procedures that were performed while setting the Weekday Program periods using the NEXT button to advance through the values Return the dial to the RUN position when you are finished BATTERIES AND MAINTENANCE This thermostat is powered by two AA alkaline batteries The batteries should be replaced AT LEAST once per year or sooner if the LOW BAT battery symbol appears in the lower left portion of the display screen as shown below To replace the batteries in the thermostat remove the thermostat s body from the base plate attached to the wall by pressing the thumb latch at the bottom center of the unit and swinging the body towards you up and away from the base Remove the used batteries from the battery tray and discard appropriately B DOE mm JL Install two new Energizer or DURACELL AA size alkaline batteries into the battery tray Observe the polarity markings shown in the battery compartment to ensure proper installation When finished hang the top of the unit
7. AND 4 WIRE 24 VOLT COOLING ONLY SYSTEMS SYSTEM AIC XFMR COMPRESSOR TYPICAL 4 AND 5 WIRE 24 VOLT HEATING AND COOLING SYSTEMS WITH ONE TRANSFORMER SYST MES DE CHAUFFAGE SEUL DE 24 VOLTS 2 3 OU 4 FILS ET SYST MES DE CHAUFFAGE MINIVOLTS ROBINET DE GAZ OU APPAREIL DE CHAUFFAGE SYST MES DE CLIMATISATION SEULE DE 24 VOLTS 3 OU 4 FILS VENTILATEUR SYST MES DE CHAUFFAGE ET DE CLIMATISATION DE 24 VOLTS 4 OU 5 FILS AVEC UN TRANSFORMATEUR ROBINET DE GAZ OU APPAREIL DE CHAUFFAGE 4 SISTEMAS TIPICOS DE CALEFACCION SOLAMENTE DE 24 VOLTIOS DE 2 3 0 4 ALAMBRES Y SISTEMAS DE CALEFACCION DE MILIVOLTIOS RH RC Y W G 0 B CALENTADOR O VALVULA VENTILADOR DEGAS SISTEMAS TIPICOS DE AIRE ACONDICIONADO SOLAMENTE DE 24 VOLTIOS DE 3 Y 4 ALAMBRES XFMR DEL SISTEMA SISTEMAS TIPICOS DE CALEFACCION Y AIRE ACONDICIONADO DE 24 VOLTIOS DE 4 Y 5 ALAMBRES CON UN TRANSFORMADOR RH RC Y W G COMPRESOR CALENTADOR SISTEMA DE AIRE O VALVULA VENTILADOR ACONDICIONADO DEGAS TYPICAL 5 AND 6 WIRE 24 VOLT HEATING AND COOLING SYSTEMS WITH TWO TRANSFORMERS TYPICAL 4 WIRE 24 VOLT SINGLE STAGE HEAT PUMP SYSTEMS REVERSING VALVE WIRING DIAGRAM NOTES All of the dashed wires are optional and usage depends upon your specific system type Use either the B or the O wire but not both Generally the B and O terminals are only used for Heat Pump systems If replacing a Honeywell
8. INSTALLATION AND OPERATING INSTRUCTIONS TX500E Programmable Thermostat WARNING 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 Mt Laurel New Jersey 08054 USA http www luxproducts com B P7 52073 Thank you for your confidence in our product To obtain the best results from your investment please read these instructions and acquaint yourself with your purchase COMPATIBILITY This thermostat can be used with most single stage 24 volt gas oil or electric heating and or cooling systems single stage heat pumps or gas Millivolt heating systems It cannot be used with 3 wire zone valves 120 volt heating systems or multi stage heat pumps Ask your dealer for other LUX thermostats to control those systems FEATURES LCD Liquid Crystal Display Set Temperature Buttons Fan Mode Software Switch heset Button Temperature m Wu o Mode Switch LUX A gt Quick Reference d pr Door Instructions Small elegant design e F C Temperature Display Exclusive LUX Speed Dial 12 24 Hr Clock Display AirFilter Monitor Adjustable Temperature Differential 5 2 Day Programming Cycle Rate Energy Star Compliant User Temperature Offset 4 Periods Per Day Calibration Battery Free Memory Storag
9. SETUP OPTIONS SYSTEM TYPE SETTING This setting tells the thermostat about the type of heating and cooling equipment that it is controlling so that the system is operated properly There are two operating modes based on your system type Furnace Fn or Heat Pump HP If you have a Furnace ensure this is set to Fn If you have a Heat Pump ensure this is set to HP Install two new Energizer or DURACELL AA size alkaline batteries before continuing further Ensure that the batteries are installed in the proper direction as per the markings shown in the battery tray With the thermostat powered by batteries press and hold the HOLD button and then press the Hardware Reset button once on the back of the unit s circuit board Continue to hold the HOLD button until SYS is shown on the LCD screen Use the UP or DOWN buttons to toggle between Fn and HP modes When you are finished press NEXT This setting is now complete and will not change unless you adjust it again This is true even in the event of a power failure or if a reset button is pressed NOTE All of the settings options and components listed in this section are located on the rear of the thermostat on the circuit board HARDWARE RESET The hardware reset is a push button that is located on the right edge of the circuit board just above the battery location This reset button is used by the thermostat to reset the unit s clock and read the posi
10. TM 11 tape off the R wire Connect the B wire to the RH terminal If replacing a thermostat that has a clock wire labeled as C tape off this wire and do not connect it to this thermostat elf Y and C wires are both present then C is a common wire do not connect it to this thermostat e If a B wire in your system is a common wire connecting it to the B terminal of this thermostat may damage your system and the thermostat tape it off and do not connect it SYSTEMES DE CHAUFFAGE ET DE CLIMATISATION DE 24 VOLTS 5 OU 6 FILS AVEC DEUX TRANSFORMATEURS ROBINET DE GAZ OU APPAREIL DE CHAUFFAGE SYSTEMES A POMPE DE CHAUFFAGE MONO TAG E DE 24 VOLTS 4 FILS TRANSFORMATEUR POMPE DE ROBINET SYSTEME CHAUFFAGE VENTILATEUR D INVERSION NOTES SUR LES SCHEMAS DE CABLAGE e Tous les fils pointill s sont optionnels leur pr sence d pend du syst me install Utiliser B ou O mais non les deux En r gle g n rale les bornes B et O sont utilis es uniquement avec les syst mes pompe de chauffage Si le thermostat remplac tait un Honeywell TM 11 ne pas raccorder le fil R et le recouvrir de ruban lectrique Raccorder le fil B la borne RH Si le thermostat remplac comportait un fil d horloge tiquet C ne pas raccorder le fil C au thermostat et le recouvrir Si les fils Y et C sont tous deux pr sents le fil C est un fil commun Ne pas le raccorder au thermostat S
11. ase Please refer to TECHNICAL ASSISTANCE before returning thermostat 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 and Canada only idu TX500E ENGLISH WIRE IDENTIFICATION AND WIRING SCHEMATICS HEATING ONLY SYSTEMS JUMPER PROVIDED nt RC YW G LH a OPTIONAL zd COOLING ONLY SYSTEMS JUMPER PROVIDED RH RC Y W G opie HEATING COOLING SYSTEMS 4 amp 5 WIRE WITH ONE TRANSFORMER JUMPER PROVIDED RHI RC YW G HEATING COOLING SYSTEMS 5 amp 6 WIRE WITH TWO TRANSFORMERS JUMPER REMOVED 0 B k ddoe le REY aw ga RH RC V 5 TYPICAL SINGLE STAGE HEAT PUMP WIRING RC RH JUMPER CUSTOMER PROVIDED SUPPLIED JUMPER RH RC viw G SYSTEMES DE CHAUFFAGE SEUL CAVALIER FOURNI RH RC YW G 3o i OPTIONNEL Ez USE B OR NOT BOTH Q SYST MES DE CLIMATISATION SEULE CAVALIER FOURNI RH RC YW G je
12. ature routines that are preset within the thermostat s memory as shown below COOL MODE 6 00 AM 70 F 21 C 6 00 AM 78 F 26 C 8 00 AM 62 F 17 C 8 00 AM 85 F 29 C 6 00 PM 70 F 21 C 6 00 PM 78 F 26 C 10 00 PM 62 F 17 C 10 00 PM 82 F 28 C MINIMUM RUN TIME DELAY This is determined by the thermostat and controls the minimum length of time that the thermostat must remain with Heat or Cool either On or Off before it will automatically switch to the alternate On or Off state This feature prevents rapid or short cycling and provides compressor protection for cooling equipment The time amount for this delay is fixed at 5 minutes between on or off load changes TEMPERATURE OVERRIDE A Temperature Override occurs in Run mode in either Heat or Cool anytime the user adjusts the set temperature to a value that differs from the stored program temperature for that day and time When the thermostat is in an Override the word Override will appear in the temperature area of the display The thermostat will maintain thermal control using this new set temperature until the start of the next program period time is reached At the start of the next program period the set temperature will return to its programmed value To enter an Override in either Heat or Cool mode push either the UP or DOWN button once and the set temperature will begin to flash Push either the UP or DOWN button to
13. drafts from affecting the thermostat Remove the body from the thermostat s base by pressing the thumb latch at the bottom center of the unit and swinging the body away wo N NOTE If you are mounting the base to 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 and insert the plastic anchors provided 4 Hold the base against the wall Route the wires through the hole below 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 CONNECTING THE WIRES 5 Wires must be trapped between the black clamps and the brass terminals as shown here 6 Being careful not to overighten them securely tighten all of the electrical terminal screws including any unused ones NOTE When you are finished performing your installation and setup options please remove the thin plastic film that is protecting the LCD display screen on the front of the thermostat This plastic may or may not be present and is evident by the appearance of fake digits appearing on the display screen WIRING INFORMATION Complete heating and or cooling system wiring can be found in the WIRE IDENTIFICATION AND WIRING SCHEMATICS section of this instruction sheet The schmatics shown provide component information for brand new instal lations or for unreferenced wires
14. e 5Minute Minimum Run Off Time For Temporary Temperature Override Short Cycle and Compressor Temperature Hold Protection Keyboard Lockout INSTALLATION Please read ALL of these instructions carefully before beginning installation Save them for future reference TOOLS REQUIRED e 1 Phillips screwdriver Drill with 3 16 in 4 8mm bit Wire Stripper Cutter CAUTION This thermostat is protected against normal minor static electric discharges however to minimize the risk of damaging the unit in extremely dry weather touch a grounded metal object before touching your 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 in a room that is used often 2 Do not locate where air circulation is poor such as in a corner or an alcove or behind an open door 3 Do not install it where there are unusual heating conditions such as in direct sunlight near a lamp television radiator register or fireplace near hot water pipes in a wall near a stove on the other side of a wall 4 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 5 Do not locate in a damp area This can lead to corrosion that
15. i dans votre syst me le fil B est le fil commun le fait de le raccorder la borne B de ce thermostat peut endommager le syst me et le thermostat Ne pas le raccorder et le recouvrir SISTEMAS TIPICOS DE CALEFACCION Y AIRE ACONDICIONADO DE 24 VOLTIOS DE 5 Y 6 ALAMBRES CON DOS TRANSFORMADORES RH RC Y W G VENTILADOR CALENTADOR O VALVULA DEGAS SISTEMAS TIPICOS DE BOMBA DE CALOR DE UNA FASE DE 24 VOLTIOS DE 4 ALAMBRES UNIDAD DE Xepe LAsowsA VENTILADOR Madre DECALOR NOTAS SOBRE LOS DIAGRAMAS DE CABLEADO Todos los alambres de trazo discontinuo son opcionales y el uso depende del tipo de su sistema espec fico Use el alambre B o el O pero no ambos Generalmente los terminales B y O se usan solamente para sistemas de bombas de calor Si va a reemplazar un Honeywell TM 11 coloque cinta sobre el alambre R Conecte el alambre B al terminal RH Si va a reemplazar un termostato que tiene un alambre para el reloj marcado con una C coloque una cinta sobre este alambre y no lo conecte a este termostato Si existen los dos alambres Y y C entonces C es un alambre comin no lo conecte a este termostato Si el alambre B de su sistema es un alambre com n conectarlo al terminal B de su termostato puede da ar su sistema y el termostato coloque una cinta sobre el mismo y no lo conecte
16. isable the filter monitor Return the dial to the RUN position once you are finished setting the filter life To monitor the Filter Days Left or Filter Percent Left turn the dial to the AIR FILTER position The amount of filter life remaining will be shown in the clock portion of the display screen Return the dial to the RUN position once you are finished viewing the filter life remaining RESET FILTER COUNTER Once you have replaced your filter the filter life counter is reset back to its full amount remaining value by turning the dial to AIR FILTER and pressing the UP and DOWN buttons together at the same time NOTE The counter is also reset by changing the filter setting value as described above to a different number of days ADVANCED FEATURES SWING SETTING A thermostat works by turning your heating or cooling system on and off whenever the room temperature varies from the set point temperature The amount of this variation is called the swing Your system should cycle on about 3 to 6 times per hour A smaller swing number increases the number of cycles per hour so the room temperature is more precise and constant A larger swing number decreases the number of cycles per hour but saves energy in most cases To change the Swing setting turn the dial to RUN mode Hold down the NEXT button and push the HOLD button once then let go of both The words SWING and SET will appear on the screen with a number Use the UP DOWN button
17. isible in the area above the clock as shown below a NOTE The Keylock will be disabled if the Hardware Reset button is pressed PROGRAMMING For all of the programming areas that are described below this thermostat provides four independent periods per day for Heat mode and Cool mode they are MORN DAY EVE and NITE Each period ends at the start time of the following period The programs for each Temperature mode are programmed separately When you perform a Software Reset an Energy Star approved program is inserted into all of the program periods You can use these default programs or alter any portion of them to suit your own preferences When setting the program items the value that is flashing is the item that you can change at that time SET WEEKDAY PROGRAM Select either HEAT or COOL with the Temperature mode switch Rotate the dial to WEEKDAY PROGRAM You will be programming all five weekdays at the same time The first period is MORN Using the UP and DOWN buttons set the start time for this period and then push the NEXT button to proceed Now set the desired set temperature for the MORN period using the UP and DOWN buttons and push NEXT to proceed Now set the start time and set temperature for the DAY period pushing NEXT after each to advance Continue with these same steps to set the start time and set temperature for the EVE and NITE program periods When you are finished setting all four periods you may continue
18. s to change the number value between 1 and 9 Number 1 is the default setting Press the NEXT button to accept the setting and return to normal Run mode TEMPERATURE CALIBRATION The internal temperature sensor in this thermostat is accurately calibrated at the factory The Temperature Calibration feature allows you to manually offset the measured temperature by as much as plus or minus 5 F 3 C degrees from its original value This feature can be useful to match this thermostat to another one or more if multiple thermostats are used in the same home To change the Temperature Calibration turn the dial to RUN mode and place the Temperature mode switch in the OFF position Hold down the UP button and push the DOWN button once then let go of both The words CAL and SET will appear on the screen with a number Use the UP DOWN buttons to change the number value between 5 F 3 C and 5 F 3 C degrees 0 degrees of correction is the default setting Press the NEXT button to accept the setting and return to Run mode KEYLOCK To prevent tampering with any of your settings or temperatures most of the front panel buttons can be locked out by pressing the following four button sequence NEXT NEXT NEXT HOLD This sequence of keys will lock and also unlock these items UP DOWN NEXT HOLD the Rotary Dial and the Software Reset button Neither of the Mode slide switches are locked out When the Keylock is activated a padlock icon will be v
19. the new desired set temperature value An Override may be cancelled by rotating the dial changing the Temperature mode switch or by initiating a Temperature Hold 2008 LUX PRODUCTS CORPORATION ALL RIGHTS RESERVED TEMPERATURE HOLD A Temperature Hold is similar to an override but is used for maintaining a constant set temperature for a longer time duration Once a Hold is initiated the thermostat will maintain the Hold set temperature indefinitely A temperature hold may be used for days weeks or even months at a time To enter a Hold push the HOLD button once and the word Hold will appear in the temperature portion of the screen along with the set temperature flashing While the set temperature is flashing push either the UP or DOWN button to the new desired set temperature value To cancel a Hold press and release the HOLD button once again rotate the dial or change the Temperature mode switch AIR FILTER MONITOR The Air Filter Monitor counts the number of days and the amount of usage since your furnace filter has been replaced In Run mode the CHANGE FILTER indicator will appear when the remaining filter days have reached zero and the filter should be changed To set and use the Air Filter Monitor turn the rotary dial to AIR FILTER Press NEXT and the Filter Days Left value will start flashing Use the UP or DOWN buttons to select the number of days of filter life that your filter is rated for Setting this value to OFF will d
20. tion of all of the option switches When any of the following items are changed the hardware reset button must be pushed for the change to be recognized User temperature programs are not erased when a hardware reset is performed HEAT FAN CONTROL JP1 This setting defines the fan operation FAN while in Heat mode and when the fan ELECTRIC T GAS is in Auto This setting has no effect while the thermostat is in Cool mode or if there is no blower fan connected to the G wire terminal GAS Use this setting if you have a Gas or Oil heating system In the GAS setting the heating system itself controls the operation of the blower fan if equipped ELECTRIC Use this setting if you have a Heat Pump or Electric heating system In the ELEC setting the heating system requires the thermostat to control the operation of the blower fan The following option settings are all located within a group of small switches labeled 1 through 3 as shown below and are located in the center of the circuit board TIME FORMAT This determines how the thermostat displays the clock and all other times on the screen Switch position OFF is 12 HR and ON is 24 HR TEMPERATURE SCALE This determines how the thermostat displays all temperatures on the screen Switch position OFF is F and ON is C FILTER DISPLAY This determines how the remaining filter life will be displayed when the rotary dial is turned to the AIR FILTER position In the Percent
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