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Lux Products 52126 - page 1
SYSTEM COMP A TIBILITY. . . . . . . . 2 FEA TURES . . . . . . . . . . . . . . . . . 3 TOOLS YOU MA Y NEED . . . . . . . . . 3 MOUNTING LOCA TION . . . . . . . . . 4 REMOVE OLD THERMOST A T . . . . . 4 INST ALL THERMOST A T BASE . . . . . 5 WIRING INFORMA TION . . . . . . . . . 5 CAUTIONS AND WARNINGS . . . . . . 6 WIRING DIAGRAMS . . . . . . . . . ...
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Lux Products 52126 - page 2
2 HOLD SET RUN DA Y/TIME TEMP PROG AIR FILTER TEMPERATURE HEAT OFF COOL FAN AUTO ON EMER NEXT 74 F ˚ 72 F ˚ 5 : 36 P HEAT T U D AY S ET R OOM FAN LCD Display Screen P521U UP , DOWN and HOLD Buttons Set Slide Switch Fan Mode Switch System Mode Switch The electrical rating for this thermostat is 1.5 Amps per terminal, with a maximum total combined ...
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Lux Products 52126 - page 3
• 1 or 2-Heat / 1-Cool, 5/2-day programming • Universal Compatibility for all system types • Weekdays and W eekends can be programmed separately • Exclusive LUX ® Speed Slide TM for easy programming • User -selectable periods per day (2 or 4) • User -selectable programmable or non-programmable operation • LuxLight ® EL (Electro-Lumi ...
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Lux Products 52126 - page 4
On replacement installations, mount the new thermostat in place of the old one unless the conditions listed below suggest otherwise. On new installations, please follow these general guidelines: 1. Mount the thermostat on an inside wall, about 5 ft. (1.5m) above the floor . 2. Do not locate the thermostat where air circulation is poor such as in a ...
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Lux Products 52126 - page 5
1. Strip wire insulation leaving only 3/8 in. (9.5mm) bare wire ends, and clean off any corrosion present. 2. Fill the wall opening with non-combustible insulation to prevent drafts from affecting the thermostat’ s normal operation. 3. Route the wires through the opening in the new thermostat base plate, and hold the base against the wall. T ry t ...
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Lux Products 52126 - page 6
• The thermostat requires batteries to operate and failure or sub-standard performance of the batteries may impair or prevent the correct operation of the thermostat. Use Duracell or Energizer alkaline batteries ONL Y for all Lux thermostats requiring batteries. BE SURE TO CHANGE THE BA TTERIES A T LEAST ONCE A YEAR. Failure to follow these batte ...
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Lux Products 52126 - page 7
WIRING DIAGRAM NOTES: (Important, please read all notes before connecting wires) • If the information provided in the following wiring diagrams does not clearly represent or match your system, please refer to the “TECHNICAL ASSIST ANCE” section of this manual, and contact us before removing any of your existing thermostat wiring. • All of t ...
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Lux Products 52126 - page 8
8 #1 CONVENTIONAL: HEA TING ....................................8 1-ST AGE OR 2-ST AGE 2, 3, 4, 5 WIRES #2 CONVENTIONAL: HEA TING ....................................9 3-WIRE ZONE V AL VE 3, 4 WIRES #3 CONVENTIONAL: COOLING ..................................10 1-ST AGE 3, 4 WIRES #4 CONVENTIONAL: HEA TING AND COOLING ................11 1-ST AGE HEA ...
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Lux Products 52126 - page 9
9 W1 4 W X F G B* W2 RH V R W1 A W2 O B C G Y RC RH 1-ST AGE OR 2-STAGE, HEA TING ONL Y (INCLUDING MILLIVOL T) (2-WIRE HEAT USE “RH” & “W1”) Factory RH-RC Jumper Wire Installed #1 2, 3, 4, 5 WIRES C HEA TER ST AGE 1 ST AGE 2 FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON FAN WIRE MA Y NOT BE PRESENT IN ALL SYSTEMS NOTE: THE BLACK TERMINAL LE ...
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Lux Products 52126 - page 10
10 X B* C RH V R W1 4 W A W1 A W2 O B C G Y RC RH HOT WA TER HEATING ONL Y (WITH A 3-WIRE ZONE VAL VE) Factory RH-RC Jumper Wire Installed #2 3, 4 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC SYSTEM 24V TRANSFORMER SYSTEM COMMON OPEN = Heat On CLOSE = Heat Off 3-WIRE ZONE V ALVE OPEN CLOSE O P T I O ...
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Lux Products 52126 - page 11
11 X F G Y1 6 Y B* RC V R W1 A W2 O B C G Y RC RH 1-ST AGE, COOLING ONL Y Factory RH-RC Jumper Wire Installed #3 C FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON 3, 4 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L AIR CONDITIONER ...
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Lux Products 52126 - page 12
12 RH RC V R Y1 6 Y F G X W1 4 W B* W1 A W2 C G O BY RC RH CONVENTIONAL (NON HEA T PUMP) 1-ST AGE HEATING AND 1-ST AGE COOLING Factory RH-RC Jumper Wire Installed #4 C FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON HEA TER AIR CONDITIONER 4, 5 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L ...
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Lux Products 52126 - page 13
13 W2 RH RC V R Y1 6 Y F G X W1 4 W B* W1 A W2 C G O BY RC RH CONVENTIONAL (NON HEA T PUMP) 2-ST AGE HEATING AND 1-ST AGE COOLING Factory RH-RC Jumper Wire Installed #5 C FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON AIR CONDITIONER 5, 6 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L HEA TE ...
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Lux Products 52126 - page 14
14 X B* C R V RH R V RC Y1 6 Y F G W1 4 W W1 A W2 O B C G Y RC RH 1-ST AGE HEATING AND 1-ST AGE COOLING WITH TWO SEPARA TE 24V TRANSFORMERS Factory RH-RC Jumper Wire REMOVED #6 FA N HEA T 24V TRANSFORMER COOL 24V TRANSFORMER SYSTEM COMMON HEA TER AIR CONDITIONER 5, 6 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRA ...
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Lux Products 52126 - page 15
15 O X F G Y1 6 Y B* RC V R W1 A W2 O B C G Y RC RH SINGLE-ST AGE HEAT PUMP SYSTEM WITH NO AUX OR EMERGENCY HEA T #7 C FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON 4, 5 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC O P T I O N A L HEA T PUMP REVERSING VA LVE ** Use “O” or “B” T erminals, Never Bo ...
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Lux Products 52126 - page 16
16 CUSTOMER INST ALLED Y -W1 Jumper Wire X B* C W3 W W2 O F G Y1 6 Y RC V R W1 A W2 O B C G Y RC RH 2-HEA T / 1-COOL, HEAT PUMP SYSTEM WITH AUX AND EMERGENCY HEA T Factory RH-RC Jumper Wire Installed #8 FA N SYSTEM 24V TRANSFORMER SYSTEM COMMON 5, 6 WIRES NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC HEA T ...
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Lux Products 52126 - page 17
On the thermostat’ s circuit board, there is a row of DIP switches, labeled #1 through #8. The position of these switches will change how the thermostat operates, and also how information is conveyed to you on the LCD display screen. If you make any changes to these options, the changes are not recognized unless you either: change the position of ...
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Lux Products 52126 - page 18
temperature. [ON/UP = 2] The thermostat operates in the same manner as above, however there are only two temperature program periods for heating and cooling (DA Y and NITE). This may be more convenient if you are typically home during the day , and only need the set temperature to be different while you are sleeping. SWITCH #4 (SCALE): [OFF/DOWN = ...
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Lux Products 52126 - page 19
SWITCH #8 (BA TTERY MONITOR): [OFF/DOWN = ON, default] This setting, regularly monitors the battery level, and shows “LOW BA T” on the screen if the batteries need to be replaced. Use this setting at all times when batteries are present in the thermostat. [ON/UP = OFF] This setting only applies if you are NOT physically using batteries in the t ...
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Lux Products 52126 - page 20
These items below are all located behind the door on the front of the thermostat. T o open the door , pull outwards using the small indentation in the center of the top edge of the thermostat housing. HEA T / OFF / COOL, SYSTEM MODE SWITCH: Set this switch to HEA T to control your heating system, and COOL to control your cooling system. The OFF pos ...
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Lux Products 52126 - page 21
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 flashing if it can currently be adjusted. HOLD BUTTON: This button activates and deactivates the manual T emperature Hold feature. EMER BUTTON: W ...
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Lux Products 52126 - page 22
HEA TING AND COOLING : Basic operation of your heating or cooling system can be obtained with the Set Slide Switch in the RUN position and choosing either HEA T or COOL on the System Mode switch. The temperature can be adjusted using the UP and DOWN buttons. When the thermostat is first powered up, it will follow a default temperature routine that ...
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Lux Products 52126 - page 23
LCD DISPLA Y BACKLIGHT : The display screen is lighted to assist viewing at nighttime, or in locations with low light levels. A press of any button on the front panel will light the display for approximately 10 seconds. Any button presses that occur while the light is on will reset the 10-second timer , causing the screen to remain illuminated for ...
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Lux Products 52126 - page 24
By default, this thermostat has 4 separate program periods for both Heat and Cool mode, they are: MORN, DA Y , EVE, and NITE. Each period ends at the start time of the following period. The heat programs are set in HEA T 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 ...
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Lux Products 52126 - page 25
TEMPERA TURE SWING AND OFFSET SETTING: A thermostat works by turning your heating or cooling system on and off whenever the room temperature varies from the desired set-point temperature. The amount of this variation is called the swing. Generally your system should cycle on about 3 to 6 times per hour . A smaller swing number makes the system cycl ...
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Lux Products 52126 - page 26
26 70˚F Set T emperature 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 (1 st Stage) (2 nd Stage) ** Cut-In / Cut-Out Offset ** Setting= 4˚F degrees ...
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Lux Products 52126 - page 27
TEMPERA TURE CALIBRA TION: The internal temperature sensor in this thermostat is accurately calibrated at the factory , and in most cases alterations to this setting should not be needed. The T emperature 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 valu ...
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Lux Products 52126 - page 28
TO SET THE HEA T LIMIT STOP: Place the System Mode switch in the OFF position, and the Set Slide switch in the RUN position. Press and hold the UP button while sliding the System Mode switch from OFF to HEA T . The words “STOP” and “LOCK CODE” will appear on the screen, along with two digits. Use the UP/DOWN buttons to select the proper cod ...
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Lux Products 52126 - page 29
IF YOU FORGET YOUR TEMPERA TURE STOP CODE: The code can be reset to the factory default “00” by per forming the following steps. Place the System Mode switch in the OFF position, and the Set Slide switch in the RUN position. Press and hold the NEXT and HOLD buttons together for at least 10 seconds. The screen will start flashing, and display wo ...
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Lux Products 52126 - page 30
AIR FIL TER MONITOR: In most systems 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 syst ...
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Lux Products 52126 - page 31
HARDWARE RESET : The Hardware Reset button (labeled “HW RST”) is a small round push button that is located towards the right side of the circuit board, just below the battery holder . Pressing this button will cause the LCD display screen to become fully populated, the heating and cooling load relays to cycle off, read the position of the Hardw ...
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Lux Products 52126 - page 32
COMPRESSOR PROTECTION BYP ASS: This optional feature permits the installer or service technician to temporarily disable the built in compressor protection delays. This is most useful for diagnosing and testing the heating and cooling systems after installation is complete, and should not be used during normal operation. T o activate this feature, p ...
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Lux Products 52126 - page 33
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 T echnical Assistance department at 856- 234-8803 during regular business hours between 8:00AM and 4:30PM Eastern Standard Time, Monday through Friday . Y ou can also receive tech ...
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Lux Products 52126 - page 34
Mt. Laurel, New Jersey 08054, USA http://www .luxproproducts.com 856-234-8803 34 HOLD 74 F ˚ 72 F ˚ 5 : 36 P HEA T T U D AY S ET R OOM FAN ...
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