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.

TEMPERATURE LIMIT STOPS: There are two independent set temperature limit

stops: a maximum heat set temperature, and a minimum cool set temperature. These stops do not prevent a user from performing normal actions like Temperature Override or Hold. The Heat Limit Stop prevents the set temperature from being adjusted higher than the heat limit setting. The Cool Limit Stop prevents the set temperature from being adjusted lower than the cool limit setting. Each of these temperature stops is user adjustable in one-degree increments, and these settings are protected by a selectable 2-digit code to prevent unauthorized tampering. By default, this 2-digit code is “00”, and the temperature stops can be used as-is with this code.

NOTE: The Temperature Limit Stop settings need to be performed in a timely manner, as the thermostat will timeout and automatically exit the setting screens after approximately 10 seconds without a button press.

TO SET THE HEAT 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 HEAT. The words “TEMP STOP” and “LOCK CODE” will appear on the screen, along with two digits. Use the UP/DOWN buttons to select the proper code to access the heat limit setting. 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 heat set temperature limit. Use the UP/DOWN buttons to adjust the maximum heat set temperature value. Press the NEXT button to accept the setting and return to the Normal Run screen in heat mode.

TO SET THE COOL LIMIT STOP: Place the System Mode switch in the OFF position, and the Set Slide switch in the RUN position. Press and hold the DOWN button while sliding the System Mode switch from OFF to COOL. The words “TEMP STOP” and “LOCK CODE” will appear on the screen, along with two digits. Use the UP/DOWN buttons to select the proper code to access the cool limit setting.

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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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