Lux Thermostat TX500U-A04 User Manual

Table of Contents

1. Introduction
2. Installation
3. Programming
4. Troubleshooting Tips
5. Frequently Asked Questions (FAQ)

1. Introduction

Thank you for purchasing the Lux Thermostat TX500U-A04. This thermostat is designed to be universally compatible with heating and cooling systems, including single and multi-stage heat pumps. It features a 5-2 day programming schedule, allowing you to set separate weekday and weekend settings with 2 or 4 periods per day. The thermostat also includes a graphical air filter monitor to help you know when to change your air filter.

2. Installation

1. Turn off power to your heating and cooling system at the circuit breaker or fuse box.
2. Remove the old thermostat from the wall, being careful not to damage any wires.
3. Label each wire with the corresponding terminal letter from the old thermostat.
4. Mount the new thermostat base on the wall, ensuring it is level and securely fastened.
5. Connect the labeled wires to the corresponding terminals on the new thermostat base.
6. Install 2 AA batteries (not included) into the thermostat.
7. Attach the thermostat to the base by aligning the tabs and gently pressing it into place.
8. Turn the power back on to your heating and cooling system.

3. Programming

1. Set the temperature slider to "OFF," the set slider to "Air Filter," and the fan slider to "AUTO" or "ON."
2. Press the "UP" and "DOWN" buttons to set the current time. Press and hold for faster scrolling.
3. Slide the set slider to "RUN" to enter programming mode.
4. Press the "UP" and "DOWN" buttons to set the desired temperature for each programmed period (MORN, DAY, EVE, NIGHT) for weekdays and weekends separately.
5. After setting the temperatures, slide the set slider back to "RUN" to save your settings and exit programming mode.

4. Troubleshooting Tips

1. If the thermostat is not functioning, ensure that the power to your heating and cooling system is turned on and that the batteries in the thermostat are fresh.
2. If the thermostat is displaying "Lo Batt," try performing a hardware reset by following the steps in the FAQ section below.
3. If the thermostat is not controlling your heating or cooling system correctly, double-check your wiring connections and programmed settings.

5. Frequently Asked Questions (FAQ)

How do I perform a hardware reset?

Follow these steps to perform a hardware reset:

1. Remove the thermostat from the wall and install fresh batteries.
2. Set the temperature slider to "OFF," the set slider to "Air Filter," and the fan slider to "AUTO" or "ON."
3. Hold the thermostat with the UP/DOWN buttons on the front accessible by your thumbs.
4. Locate the "HW RST" button on the back of the thermostat in the center of the circuit board.
5. Press and hold the UP/DOWN buttons on the front, then press and release the HW RST button on the back. Continue holding the UP/DOWN buttons until "00" appears on the display.
6. Release the UP/DOWN buttons and press the HW RST button one more time. The display should show "Days," "Filter," and "90."
7. Slide the set slider to "RUN." The display should now show the current temperature, flashing display for programming time and temperature settings, and full battery bars.
8. Reattach the thermostat to the wall and proceed with programming.

What should I do if the thermostat displays "Lo Batt" even with fresh batteries?

Try performing a hardware reset as described in the FAQ section above. If the issue persists, contact Lux customer support for further assistance.

Is this thermostat compatible with electric baseboard heat?

No, the Lux Thermostat TX500U-A04 is not compatible with electric baseboard heat systems.

Can I use rechargeable batteries in this thermostat?

Yes, you can use rechargeable batteries in the thermostat. However, you may need to perform the hardware reset procedure more frequently if using rechargeable batteries.

Q: What types of heating and cooling systems is the Lux Thermostat Program 5-2 day compatible with?

A: The Lux Thermostat Program 5-2 day is great for heating and cooling systems including single and multi-stage heat pumps. It works with all system types except electric baseboard heat.

Q: Does this thermostat have a graphical air filter monitor?

A: Yes, the Lux Thermostat Program 5-2 day has a graphical air filter monitor that helps you know when to change your air filter.

Q: How easy is it to program this thermostat?

A: The Lux Thermostat Program 5-2 day has an exclusive LUX speed slide that delivers effortless programming. It also has separate weekday and weekend programming with 2 or 4 periods per day, making scheduling simple.

Q: Is there a swing setting on this thermostat?

A: The early model TX500U has nine swing settings, while the newer design TX500Ua or TX500Ub does not have swing settings. Instead, temperature variation is controlled by setting three different settings on your thermostat labeled Item #8, #9, and #10 (one for each mode: Heat, Cool, and Emergency Heat if applicable).

Q: Is this thermostat compatible with a gas-fired boiler that produces hot water baseboard heating?

A: Yes, the Lux Thermostat Program 5-2 day will operate your gas-fired boiler with two or three wires to the present thermostat to control your zone valve or motor.

Q: Can you lock the keypad on this thermostat to prevent others from adjusting it?

A: Yes, you can lock the keypad on this thermostat. However, someone can still manually shut it off by opening the flap and moving the Temperature slide switch for Heat Off Cool to Off.

Q: Is there a slot for a W2 wire on this thermostat?

A: Yes, the Lux Thermostat Program 5-2 day has a W2 terminal for your auxiliary heating wire. If you have a heat pump, follow fig. #8 for 2 stage heat pump wiring.

Q: What do I do if the thermostat flashes "Lo battery" even with fresh batteries?

A: If the thermostat flashes "Lo battery" even with fresh batteries, a hardware reset might be required. To perform the hardware reset, remove the thermostat from its wall unit as if you were changing batteries and install fresh batteries. Make sure the switch positions on the thermostat are in specific positions, then hold the thermostat in each hand so that the UP/DOWN buttons on the front can be depressed with each thumb. Simultaneously press and hold the UP/DOWN buttons on the front and while continuing to hold, then press and release the HW RST button on the back in about the center of the circuit board.