Lux Products P621U operating instructions 2 1 U

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P 6 2 1 U

SMART TEMP® UNIVERSAL

5/1/1-DAY PROGRAMMABLE THERMOSTAT

(FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS)

INSTALLATION AND OPERATING INSTRUCTIONS

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. Please connect wires using the terminal letter designations.

Thank you for your confidence in our product. To obtain the best results from your investment, please read and follow the installation procedures carefully, and one step at a time. This will save you time and minimize the chance of damaging either the thermostat or possibly your heating and cooling system. These instructions may contain information beyond that which may be required for your particular installation.

CAUTIONS AND WARNINGS . . . . . . . . . . 2 SYSTEM COMPATIBILITY . . . . . . . . . . . . 3 FEATURES . . . . . . . . . . . . . . . . . . . . . . . 4 TOOLS YOU MAY NEED . . . . . . . . . . . . . . 4 MOUNTING LOCATION . . . . . . . . . . . . . . 5 REMOVE OLD THERMOSTAT . . . . . . . . . . 5 INSTALL THERMOSTAT BASE . . . . . . . . . 6 WIRING INFORMATION . . . . . . . . . . . . . . 6 WIRING DIAGRAMS . . . . . . . . . . . . . . . . 8 HARDWARE SETUP OPTIONS . . . . . . . . 17

COMPLETE THE INSTALL . . . . . . . . . . . 19 FRONT PANEL ITEMS . . . . . . . . . . . . . . 19 OPERATING INSTRUCTIONS . . . . . . . . . 21 TEMPERATURE PROGRAMS . . . . . . . . . 23 ADVANCED FEATURES . . . . . . . . . . . . . 24 BATTERY REPLACEMENT . . . . . . . . . . . 31 TECHNICAL ASSISTANCE . . . . . . . . . . . 31 LIMITED WARRANTY . . . . . . . . . . . . . . 32 MERCURY NOTICE . . . . . . . . . . . . . . . . 32

WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only.

Energizer® is a registered trademark of Eveready Battery Company, Inc. DURACELL® is a registered trademark of The Procter & Gamble Company

© 2013 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED

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Contents 2 1 U Page System Compatibility P621UTools YOU MAY Need FeaturesRemove OLD Thermostat Mounting LocationWiring Information Install Thermostat BaseWiring Diagram Notes With AUX / Emergency Heat Wiring DiagramsIncluding 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 Front Panel Items Complete the InstallPage Operating Instructions Heat Mode Cool ModePage Temperature Programs Advanced Features 70˚F Set Temperature Swing Setting= Page Page Page Page Software Reset The Software Reset button labeled SW Technical Assistance Battery ReplacementMercury Warning and Recycling Notice Limited Warranty536 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.