Lux Products P621U operating instructions Software Reset The Software Reset button labeled SW

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SW RST
HW RST

HARDWARE RESET: The Hardware Reset button (labeled “HW RST”) is a small round push button that is located towards the

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. 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 Software Reset button (labeled “SW

RST”) is a small round push button that is located towards the left side if the circuit board, just below the battery holder. A

Software Reset is used to erase all heating and cooling temperature programs, and any user-adjustable software values such as: Swing, Offset, and Calibration, to their original

factory default values. To perform a Software Reset, press and hold the Software Reset button for at least 5 seconds. The LCD display screen will become fully populated, than return to normal. The thermostat will still retain the current day and ttime even after a Software Reset has been performed.

COMPRESSOR PROTECTION BYPASS: 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. To activate this feature, press and hold both the NEXT and HOLD buttons, while also perform a single press of the Hardware Reset button (the LCD display screen will become fully populated). Continue to hold the NEXT and HOLD buttons until the LCD display screen returns to normal. All compressor protection delays (in all modes of operation) will be disabled for 5 minutes. After the 5-minute duration has expired, the thermostat will return to normal operation automatically.

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Contents 2 1 U Page P621U System CompatibilityFeatures Tools YOU MAY NeedMounting Location Remove OLD ThermostatInstall Thermostat Base Wiring InformationWiring Diagram Notes Wiring Diagrams With AUX / Emergency HeatIncluding Millivolt 2-WIRE Heat USE RH & W1 HOT Water Heating only STAGE, Cooling only Stage Heating and 1-STAGE Cooling Stage Stage Cooling with TWO Separate 24V Transformers SINGLE-STAGE Heat Pump System Heat / 1-COOL, Heat Pump System Hardware Setup Options Page Complete the Install Front Panel ItemsPage Heat Mode Cool Mode Operating InstructionsPage Temperature Programs Advanced Features 70˚F Set Temperature Swing Setting= Page Page Page Page Software Reset The Software Reset button labeled SW Battery Replacement Technical AssistanceLimited Warranty Mercury Warning and Recycling Notice536 P

P621U specifications

The Lux Products P621U is a highly popular digital programmable thermostat that has garnered attention for its user-friendly interface and advanced features, making it a prime choice for homeowners looking to optimize their heating and cooling systems. With a sleek design and an array of functionalities, the P621U not only enhances energy efficiency but also ensures comfort in the home.

One of the main features of the P621U is its 7-day programmable schedule. This allows users to customize their heating and cooling settings for each day of the week, making it easy to align the thermostat's operation with their lifestyle. The ability to set different temperatures for weekday and weekend usage helps to minimize energy consumption when the house is unoccupied, ultimately leading to cost savings on utility bills.

The P621U employs 2H/2C heat pump technology, which facilitates the management of both heating and cooling systems efficiently. This dual-stage capability ensures that the thermostat can adapt to varying temperature demands, delivering optimal comfort year-round. Additionally, the thermostat is compatible with a wide range of HVAC systems, including conventional heating and cooling, heat pumps, and even gas or electric systems.

Another standout characteristic of the Lux Products P621U is its intuitive touchscreen display. The large, backlit screen is easy to read and navigate, allowing users to quickly adjust settings or check the current temperature. The user-friendly interface promotes a hassle-free experience, and the straightforward programming process means users can set it up with minimal effort.

The thermostat also features an auto changeover function that automatically switches between heating and cooling modes based on the temperature settings. This adaptive technology ensures that users experience consistent comfort without the need for manual adjustments. Moreover, the P621U includes a battery backup system, which preserves settings during power outages, ensuring uninterrupted operation.

The Lux Products P621U also comes equipped with an energy-saving mode, which encourages users to adopt energy-efficient practices. By allowing users to set eco-friendly temperatures, the thermostat not only helps maintain a comfortable environment but also promotes sustainability.

In summary, the Lux Products P621U is a sophisticated yet simple solution for modern heating and cooling management. With its programmable capabilities, dual-stage technology, intuitive interface, and energy-saving features, it provides a balance of comfort, convenience, and efficiency that can significantly enhance any home environment.
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