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Lux Products P621U - page 1
C AUTIONS AND W ARNINGS . . . . . . . . . . 2 SY STEM COMP A TIBILITY . . . . . . . . . . . . 3 FEA TURES . . . . . . . . . . . . . . . . . . . . . . . 4 TOOLS Y OU MA Y NEED . . . . . . . . . . . . . . 4 MOUNTING LOC A TION . . . . . . . . . . . . . . 5 REMOVE OLD THERMOST A T . . . . . . . . . . 5 INST ALL THERMOST A T BASE . . . . . . . . . 6 WI ...
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Lux Products P621U - page 2
• This thermostat requires ba tteries to operate and failure or sub-standard performance of the batteries may impair or prevent the correct opera tion of the thermostat. Use Duracell ® or Energizer ® alkaline batteries ONL Y for all LUXPRO thermostats requiring ba tteries. BE SURE TO CHANGE THE BA TTERIES A T LEAST ONCE A YEAR, or whenever you ...
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Lux Products P621U - page 3
SETBACK HOLD SET RUN DA Y/TIME TEMP PROG AIR FIL TER TEMPERA TURE HEA T OFF COOL FA N AU TO ON EMER NEXT 74 F ˚ 72 F ˚ 5 : 36 P HEA T T U D AY S ET FA N 40 %L EFT F IL TER LCD Display Screen P621U UP / DOWN Buttons Set Slide Switch F an Mode Switch System Mode Switch The electrical rating for this thermosta t is 1.5 Amps per terminal, with a maxi ...
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Lux Products P621U - page 4
• 1 or 2-Heat / 1-Cool, 5/1/1-day programming • Universal Compatibility for all system types • W eekdays, Sa turday , and Sunday can be programmed separa tely • Exc lusive LUX ® Speed Slide TM for easy programming • User -selectable periods per day (2 or 4) • User -selectable programmable or non-programmable opera tion • LuxLight ® ...
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Lux Products P621U - page 5
On replacement installations, mount the new thermosta t in place of the old one unless the conditions listed below suggest otherwise. On new installa tions, 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 ...
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Lux Products P621U - page 6
1. Strip wire insulation leaving only 3/8 in. (9.5mm) bare wire ends, and c lean off any corrosion present. 2. F ill the wall opening with non-combustible insulation to prevent drafts from affecting the thermostat’ s normal opera tion. 3. Separate new thermostat housing using your thumb and index finger . Provide pressure in opposite directions t ...
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Lux Products P621U - page 7
WIRING DIAGRAM NO TES: (Important, please read all notes before connecting wires) • If the information provided in the following wiring dia grams does not c learly represent or match your system, please refer to the “TECHNICAL ASSIST ANCE” section of this manual, and contact us before removing an y of your existing thermostat wiring. • All ...
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Lux Products P621U - page 8
8 #1 CONVENTIONAL: HEA TING ............................................................9 1-ST AGE OR 2-ST AGE 2, 3, 4, 5 WIRES #2 CONVENTIONAL: HEA TING ..........................................................10 3-WIRE ZONE V AL VE 3, 4 WIRES #3 CONVENTIONAL: COOLING ..........................................................11 1-ST AGE 3, 4 WIRE ...
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Lux Products P621U - page 9
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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-ST AGE, HEA TING ONL Y (INCLUDING MILLIVOL T) (2-WIRE HEA T 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 SY STEM 24V TRANSFOR ...
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Lux Products P621U - page 10
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC X B* C RH V R W1 4 W A W1 A W2 O B C G Y RC RH HOT WA TER HEA TING ONL Y (WITH A 3-WIRE ZONE V AL VE) Factory RH-RC Jumper Wire Installed #2 3, 4 WIRES SY STEM 24V TRANSFORMER SYSTEM COMMON OPEN = Heat On CLOSE = Heat Off 3-WIRE ZONE V AL VE OPEN CL OSE O P T I ...
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Lux Products P621U - page 11
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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 SY STEM 24V TRANSFORMER SYSTEM COMMON 3, 4 WIRES O P T I O N A L AIR C ONDITIONER 11 ...
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Lux Products P621U - page 12
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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 HEA TING AND 1-ST AGE COOLING Factory RH-RC Jumper Wire Installed #4 C FA N SY STEM 24V TRANSFORMER SYSTEM COMMON HEA TER AIR C ONDITIONER 4, 5 WIRES O P T I O N A L 1 ...
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Lux Products P621U - page 13
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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 HEA TING AND 1-ST AGE COOLING Factory RH-RC Jumper Wire Installed #5 C FA N SY STEM 24V TRANSFORMER SYSTEM COMMON AIR C ONDITIONER 5, 6 WIRES O P T I O N A L HEA TE ...
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Lux Products P621U - page 14
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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 CONVENTIONAL (NON HEA T PUMP) 1-ST AGE HEA TING AND 1-ST AGE COOLING WITH TWO SEP ARA TE 24V TRANSFORMERS Factory RH-RC Jumper Wire REMOVED #6 FA N HEA T 24V TRANSFORMER C OOL 24V TRANSFORMER SYSTEM ...
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Lux Products P621U - page 15
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC O X F G Y1 6 Y B* RC V R W1 A W2 O B C G Y RC RH SINGLE-ST AGE HEA T PUMP SYSTEM WITH NO AUX OR EMERGENCY HEA T #7 C FA N SY STEM 24V TRANSFORMER SYSTEM COMMON 4, 5 WIRES O P T I O N A L HEA T PUMP REVERSING VA LV E ** Use “O” or “B” T erminals, Never Bo ...
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Lux Products P621U - page 16
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA Y TERMINAL LETTERS ARE BRAND SPECIFIC 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, HEA T PUMP SYSTEM WITH AUX AND EMERGENCY HEA T Factory RH-RC Jumper Wire Installed #8 FA N SY STEM 24V TRANSFORMER SYSTEM COMMON 5, 6 WIRES HEA T P ...
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Lux Products P621U - page 17
On the thermostat’ s circuit board, there is a ro w of DIP switches, labeled #1 through #8. The position of these s witches will change how the thermosta t operates, and also ho w information is conveyed to you on the LCD display screen. If you make an y changes to these options, the changes are not recognized unless you either: change the positi ...
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Lux Products P621U - page 18
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 (SC ALE): [OFF/DOWN = F , default] All temperature values are displayed using the F ahrenheit scale. [ON/UP = C] This setting displays all temperature values using the Celsius scale. SWITCH #5 (TIME): ...
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Lux Products P621U - page 19
GAS / ELEC SLIDE SWITCH (F AN OPERA TION): This switch is a physical component by itself on the circuit board, and is much larger than the DIP switches listed above. [DOWN = GAS, default] This setting lets the heating system control the blo wer fan automatically by itself. Systems tha t would typically use the “GAS” setting would be: na tural g ...
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Lux Products P621U - page 20
thermostat’ s “G” wire terminal, to control a blower fan. The Fan Mode switch has no effect in systems that do not ha ve a blower fan (such as a hot water radiator system). MUL TI-FUNCTION, SET SLIDE SWITCH: This s witch provides an easy way to quickly access the most commonly used thermostat settings. This s witch has 4 individual positions, ...
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Lux Products P621U - page 21
NEXT BUTTON: This button is mostly used while setting items such as software options, and tempera ture program periods. When there are several items on the screen that can be changed, usually one of them is flashing indica ting that it can be adjusted. Pressing the NEXT button will cyc le through which item is flashing. SET D A Y AND TIME: Place th ...
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Lux Products P621U - page 22
outdoor temperatures are too lo w to support efficient operation, but it could also prevent damage to the hea t pump if outside temperatures are below the manufacturer’ s recommendations. As ever y heat pump has different operating characteristics, you should refer to your hea t pump literature to determine when to disable the heat pump and run i ...
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Lux Products P621U - page 23
By default, this thermosta t has 4 separate program periods for both Hea t and Cool mode, they are: MORN, DA Y , EVE, and NITE. Each period ends a t the start time of the following period. The hea t programs are set in HEA T mode, and the cool programs are set in COOL mode. NOTE: If the thermosta t is configured to use only 2 periods per day instea ...
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Lux Products P621U - page 24
TEMPERA TURE SWING AND OFFSET SETTING: A thermosta t works by turning your heating or cooling system on and off whenever the room tempera ture varies from the desired set-point temperature. The amount of this varia tion is called the swing. Generally your system should cyc le on about 3 to 6 times per hour . A smaller swing number makes the system ...
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Lux Products P621U - page 25
70˚F Set T emperature 71 DEGREES (F) ** = Only applies if a second heat stage is present 70 69 68 67 66 65 S wing Setting= #2 (+/- 0.5˚F) Cut-In / C ut-Out (1 st Stage) (2 nd Stage) ** Cut-In / C ut-Out O ffset ** Setting= 4˚F degrees 25 ...
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Lux Products P621U - page 26
TEMPERA TURE C ALIBRA TION: The internal tempera ture sensor in this thermostat is accurately calibra ted at the factor y , and in most cases altera tions to this setting should not be needed. The T empera ture Calibration fea ture allows you to manually offset the measured temperature by as much as plus or minus 5°F (3°C) degrees from its origin ...
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Lux Products P621U - page 27
desired set temperature tha t will be used for the Setback duration. Just like the previous step, you can either wait for the screen to advance on its o wn, or press the NEXT button to advance and return to the Normal Run screen. TO CANCEL A SETBACK: While in the Normal Run screen, press and hold the SETBACK button for at least 2 seconds. The word ...
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Lux Products P621U - page 28
Press the NEXT button to accept the setting. If the code you tried was not correct, the thermosta t will exit and return to the Normal Run screen with no changes made. If the entered code is correct, the screen will add the word “SET” and display the current cool set temperature limit. Use the UP/DOWN buttons to adjust the minimum cool set temp ...
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Lux Products P621U - page 29
GRAPHIC AL AIR FIL TER MONITOR: In most systems that use a blo wer fan and air ducts, there is an air filter tha t is either replaceable or requires c leaning. The filter is usually located in the air handler , where the blo wer fan is. This thermostat fea ture assists you with keeping track of proper maintenance and/or periodic replacement inter v ...
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Lux Products P621U - page 30
HARDW ARE RESET : The Hardware Reset button (labeled “HW RST”) is a small round push button that is loca ted towards the right side if the circuit board, just belo w the batter y holder . Pressing this button will cause the LCD display screen to become fully populated, the hea ting and cooling load relays to c ycle off, read the position of the ...
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Lux Products P621U - page 31
This thermostat is po wered by two “AA ” Alkaline batteries. The ba tteries should be replaced A T LEAST once per year to ensure reliable opera tion (or sooner , if the “LOW BA TT” icon a ppears at the top of the display screen). The batteries are located on the back of the thermosta t, a t the top of the circuit board. The front portion of ...
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Lux Products P621U - page 32
If this unit fails because of defects in materials or workmanship within three years of the date of original purchase, LUX will, a t its option, repair or replace it. This warranty does not cover damage by accident, misuse, or failure to follo w installation instructions. Implied warranties are limited in dura tion to three years from the date of o ...
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Lux Products P621U - page 33
Mt. Laurel, New Jersey 08054, USA http://www .luxproproducts.com 856-234-8803 33 SETBACK HOLD 74 F ˚ 72 F ˚ 5 : 36 P HEA T T U D AY S ET FA N 40 %L EFT F IL TER ...
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