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. [ON/UP = 24 HR] This setting displays the clock and temperature program period start time values on the screen using the 24 HR military-time format (17:30 hours, 22:00 hours, without using AM/PM).

SWITCH #6 (DELAY): [OFF/DOWN = 5 MIN, default] This sets the minimum length of time that Heat or Cool must remain either On or Off, before it will automatically switch to the alternate On or Off state. This internal delay prevents rapid cycling of your system and provides equipment protection particularly for cooling units. The 5-minute setting is fine for most applications. [ON/UP = 2 MIN] If you feel that your system may need to cycle more frequently than the thermostat is allowing, then you may use the 2-minute setting.

SWITCH #7 (RECOVERY): [OFF/DOWN = DISABLE, default] The Early Recovery feature affects how the thermostat transitions from an energy saving setback (DAY and NITE) program period, to a comfort (MORN and EVE) program period temperature, when it is following the daily temperature programs. When this is disabled, the thermostat makes a set temperature change at the beginning of an upcoming period's start time. [ON/UP = ENABLE] The Early Recovery feature will calculate the capability of your system and turn on the heating or cooling early so that the temperature in your home reaches the desired set point as close as possible to the start of the period. During the time that the thermostat is performing a recovery, the word “RECOV.” will be shown in the display screen.

SWITCH #8 (BATTERY MONITOR): [OFF/DOWN = ON, default] This setting, regularly monitors the battery level, and shows “LOW BAT” 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 thermostat, and are powering the thermostat entirely from the system (“C” wire terminal).

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Lux Products P621U operating instructions
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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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