P621U SMART TEMP ® UNIVERSAL 5/1/1-DAY PROGRAMMABLE THERMOSTAT (FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS) I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N S 52161 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.
CAUTIONS AND WARNINGS: • This 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 ONLY for all LUXPRO thermostats requiring batteries. BE SURE TO CHANGE THE BATTERIES AT LEAST ONCE A YEAR, or whenever you see the LO BATT indication on the screen. Failure to follow these battery instructions could result in property damage and/or personal injury.
P6 2 1 U Fan Mode Switch LCD Display Screen FAN AUTO ON TU DAY 72 FAN 5:36 P HEAT F̊ TEMPERATURE HEAT OFF FILTER %LEFT SETBACK 40 74 F̊ SET SET Set Slide Switch RUN DAY/TIME TEMP PROG AIR FILTER HOLD EMER COOL NEXT System Mode Switch UP / DOWN Buttons SYSTEM COMPATIBILITY: The electrical rating for this thermostat is 1.5 Amps per terminal, with a maximum total combined load of 3.0A for all terminals combined.
FEATURES: • • • • • • • • • • • • • • • • • • • • • • • 1 or 2-Heat / 1-Cool, 5/1/1-day programming Universal Compatibility for all system types Weekdays, Saturday, and Sunday can be programmed separately Exclusive LUX ® Speed Slide T M for easy programming User-selectable periods per day (2 or 4) User-selectable programmable or non-programmable operation LuxLight ® EL (Electro-Luminescent) lighted display Programmable air filter life timer Graphical filter monitor Keypad lockout for unauthorized users Man
MOUNTING LOCATION: 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 corner, alcove, or behind a door that is normally left open. 3.
INSTALL THERMOSTAT BASE: THERMOSTAT TOP VIEW 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. Separate new thermostat housing using your thumb and index finger. Provide pressure in opposite directions to the release tabs on the top of the housing, in the directions shown in the diagram shown above. 4.
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 ASSISTANCE” section of this manual, and contact us before removing any of your existing thermostat wiring. • All of the dashed wires shown in the wiring diagrams are either optional, or their usage depends upon your specific system type or brand.
WIRING DIAGRAMS: DIAGRAM SYSTEM TYPE / DESCRIPTION #1 CONVENTIONAL: HEATING ............................................................9 1-STAGE OR 2-STAGE 2, 3, 4, 5 WIRES #2 CONVENTIONAL: HEATING ..........................................................10 3-WIRE ZONE VALVE 3, 4 WIRES #3 CONVENTIONAL: COOLING ..........................................................11 1-STAGE 3, 4 WIRES #4 CONVENTIONAL: HEATING AND COOLING .....................................
FAN WIRE MAY NOT BE PRESENT IN ALL SYSTEMS B G RH STAGE 2 A HEATER STAGE 1 4 V SYSTEM 24V TRANSFORMER W1 RH F W W1 R SYSTEM COMMON RC G Y Factory RH-RC Jumper Wire Installed W2 W2 1-STAGE OR 2-STAGE, HEATING ONLY (INCLUDING MILLIVOLT) (2-WIRE HEAT USE “RH” & “W1”) C O P T I O N A L B* X C #1 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC FAN O 2, 3, 4, 5 WIRES
B G A CLOSE A 3-WIRE ZONE VALVE OPEN 4 W1 RH V W W1 R RH SYSTEM COMMON RC SYSTEM 24V TRANSFORMER Y Factory RH-RC Jumper Wire Installed HOT WATER HEATING ONLY (WITH A 3-WIRE ZONE VALVE) W2 X C OPEN = Heat On CLOSE = Heat Off B* C O P T I O N A L #2 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O 3, 4 WIRES
B Y1 F 6 Y Y G FAN G W1 SYSTEM COMMON RH SYSTEM 24V TRANSFORMER V RC R RC Factory RH-RC Jumper Wire Installed 1-STAGE, COOLING ONLY A AIR CONDITIONER W2 C O P T I O N A L B* X C #3 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC O 3, 4 WIRES
G RC 6 SYSTEM 24V TRANSFORMER C O P T I O N A L B* C 4 W2 X HEATER A W1 W W1 SYSTEM COMMON V RH R Y1 RH F RC Y Y G AIR CONDITIONER B Factory RH-RC Jumper Wire Installed CONVENTIONAL (NON HEAT PUMP) 1-STAGE HEATING AND 1-STAGE COOLING #4 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC FAN O 4, 5 WIRES
G RC 6 SYSTEM 24V TRANSFORMER 4 W1 W W1 SYSTEM COMMON V RH R Y1 RH F RC Y Y G AIR CONDITIONER B Factory RH-RC Jumper Wire Installed W2 W2 STAGE 2 HEATER STAGE 1 A CONVENTIONAL (NON HEAT PUMP) 2-STAGE HEATING AND 1-STAGE COOLING X C O P T I O N A L B* C #5 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC FAN O 5, 6 WIRES
G V 6 V R RH RH COOL 24V TRANSFORMER C B* C 4 HEATER W2 X A W1 W W1 HEAT 24V TRANSFORMER SYSTEM COMMON R Y1 F RC RC Y Y G AIR CONDITIONER B Factory RH-RC Jumper Wire REMOVED CONVENTIONAL (NON HEAT PUMP) 1-STAGE HEATING AND 1-STAGE COOLING WITH TWO SEPARATE 24V TRANSFORMERS O P T I O N A L #6 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC FAN O 5, 6 WIRES
O B Y1 F 6 Y Y G FAN G W1 SYSTEM COMMON RH SYSTEM 24V TRANSFORMER V RC R RC Factory RH-RC Jumper Wire Installed A HEAT PUMP W2 C CUSTOMER INSTALLED Y-W1 Jumper Wire SINGLE-STAGE HEAT PUMP SYSTEM WITH NO AUX OR EMERGENCY HEAT O P T I O N A L B* X C #7 NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC REVERSING VALVE O ** Use “O” or “B” Terminals, Never Both 4, 5 WIRES
O B FAN G Y1 F RH SYSTEM COMMON V RC R RC SYSTEM 24V TRANSFORMER 6 Y G Y Factory RH-RC Jumper Wire Installed HEAT PUMP W1 A AUX / EMERG.
HARDWARE SETUP OPTIONS: 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 the HEAT/OFF/COOL mode switch, or press the “HW RST” (Hardware Reset) button on the circuit board.
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 = F, default] All temperature values are displayed using the Fahrenheit scale. [ON/UP = C] This setting displays all temperature values using the Celsius scale. SWITCH #5 (TIME): [OFF/DOWN = 12 HR, default] This setting displays the clock times and temperature program period start time values on the screen using US standard AM and PM values.
GAS / ELEC SLIDE SWITCH (FAN OPERATION): This switch is a physical component by itself on the circuit board, and is much larger than the DIP BATTERY switches listed above. [DOWN = GAS, default] This setting lets the heating system control the blower fan automatically by itself. Systems that would ELEC typically use the “GAS” setting would be: natural gas, propane, or oil furnaces. This setting has no effect upon Cool mode operation.
thermostat’s “G” wire terminal, to control a blower fan. The Fan Mode switch has no effect in systems that do not have a blower fan (such as a hot water radiator system). MULTI-FUNCTION, SET SLIDE SWITCH: This switch provides an easy way to quickly access the most commonly used thermostat settings. This switch has 4 individual positions, and unless a specific setting is being adjusted, this switch should always remain in the RUN position for the thermostat to control the room temperature.
NEXT BUTTON: This button is mostly used while setting items such as software options, and temperature program periods. When there are several items on the screen that can be changed, usually one of them is flashing indicating that it can be adjusted. Pressing the NEXT button will cycle through which item is flashing. OPERATING INSTRUCTIONS: SET DAY AND TIME: Place the Set Slide Switch into the DAY/TIME position. With the day flashing, press UP or DOWN to set the day of the week.
outdoor temperatures are too low to support efficient operation, but it could also prevent damage to the heat pump if outside temperatures are below the manufacturer’s recommendations. As every heat pump has different operating characteristics, you should refer to your heat pump literature to determine when to disable the heat pump and run in Emergency Heat mode. LCD DISPLAY BACKLIGHT: The display screen is lighted to assist viewing at nighttime, or in locations with low light levels.
TEMPERATURE PROGRAMS: 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.
ADVANCED FEATURES: TEMPERATURE 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 cycle more frequently, so the room temperature is more precise and constant.
71 70 69 68 Cut-In / Cut-Out (1st Stage) 70˚F Set Temperature Swing Setting= #2 (+/- 0.
TEMPERATURE CALIBRATION: 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 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 or synchronize this thermostat to another one or more, if multiple thermostats are used in the same home.
desired set temperature that will be used for the Setback duration. Just like the previous step, you can either wait for the screen to advance on its own, 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 “OVERRIDE” will disappear from the screen and the Setback will be cancelled. Moving the System Mode switch or Set Slide switch, will also cancel a Setback.
Press the NEXT button to accept the setting. If the code you tried was not correct, the thermostat 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 temperature value. Press the NEXT button to accept the setting and return to the Normal Run screen in cool mode.
GRAPHICAL AIR FILTER 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 system’s filter.
HARDWARE RESET: The Hardware Reset button (labeled “HW RST”) is a small round push button that is located towards the HW RST right side if 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 Hardware Setup Option switches, and will perform an internal system check of the thermostat components.
BATTERY REPLACEMENT: 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.
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.
TU DAY 72 FAN 5:36 P HEAT F̊ FILTER %LEFT SETBACK 40 74 F̊ SET HOLD Mt. Laurel, New Jersey 08054, USA http://www.luxproproducts.