1. Introduction
The LUX LTX700U-A04 is a versatile 7-day programmable thermostat designed to provide precise temperature control for your home. It offers unique programming for every day of the week, with options for 2 or 4 periods per day, allowing for flexible scheduling to match your lifestyle. Key features include temporary override, manual hold, keyboard lock, and an easy-to-read backlit display.
This thermostat is compatible with conventional heat & A/C systems, heat pumps with up to 2 stage heat/1 stage cool, 3-wire heat-only hydronic systems, hot water, zone valves, and gas millivolt heaters.
Figure 1: Front view of the LUX LTX700U-A04 Thermostat, showing the digital display and control buttons.
2. Setup and Installation
Before installation, ensure the power to your heating/cooling system is turned off at the main breaker. This thermostat is dual-powered and requires two "AA" alkaline batteries (not included) for operation, or can be powered by the system's 24V AC supply.
2.1. Compatibility
The LTX700U-A04 is designed for broad compatibility. Please review the compatibility chart below to ensure your system is supported.
Figure 2: System compatibility chart for the LTX700U-A04 thermostat, detailing compatible and non-compatible HVAC systems.
Compatible Systems:
- Gas/Oil/Electric Furnace - Heating only
- Gas/Oil/Electric Furnace - Multistage
- Gas/Oil/Electric Furnace - Single Stage
- Heat Pump without Auxiliary Heat
- Heat Pump with Auxiliary Heat
- 2-wire Hydronic (Hot Water)
- 3-wire Hydronic (Hot Water)
- 750 Millivolt systems
- Gas Fireplaces (24V)
- Cooling only systems
- Cool Multistage systems
- Single stage cooling systems
Not Compatible With:
- Heat Pump Multistage
- Radiant Ceiling Heat
- Electric Baseboards
- Portable space heaters
- Plug-in air conditioners
2.2. Wiring Diagrams
Refer to the following diagrams for proper wiring connections based on your HVAC system type. Always consult a qualified technician if you are unsure about wiring procedures.
Figure 3: Wiring diagram for conventional (non-heat pump) 2-stage heating and 1-stage cooling systems (5, 6 wires).
Figure 4: Wiring diagram for conventional (non-heat pump) 1-stage heating and 1-stage cooling systems with two separate 24V transformers (5, 6 wires).
Figure 5: Wiring diagram for single-stage heat pump systems with no auxiliary or emergency heat (4, 5 wires).
3. Operating Instructions
The LTX700U-A04 thermostat is designed for ease of use with its intuitive control panel and large backlit display.
Figure 6: The simple and intuitive control panel of the LTX700U-A04 thermostat, highlighting its user-friendly design.
3.1. Programming Your Thermostat
The thermostat allows for 7-day programming, meaning you can set a unique schedule for each day of the week. You can choose between 2 or 4 programming periods per day (e.g., Morning, Day, Evening, Night) to optimize energy savings and comfort.
- Setting Time and Day: Access the menu to set the current time and day of the week.
- Scheduling Periods: For each day, define the start time and desired temperature for each of your chosen periods (2 or 4).
- Speed Slide: Utilize the speed slide feature for quick and easy programming adjustments.
3.2. Temperature Control Features
- Temporary Override: Adjust the temperature temporarily without changing your programmed schedule. The thermostat will revert to the schedule at the next programmed period.
- Manual Hold: Set the thermostat to a constant temperature indefinitely. This feature overrides all programming until manually cancelled.
- Keyboard Lock: Prevent unauthorized changes to your settings by activating the keyboard lock feature.
- Fahrenheit/Celsius Setting: Easily switch between Fahrenheit and Celsius temperature displays.
- Adjustable Temperature Swing Differential: Customize the temperature differential (the range around the setpoint before the system activates) to optimize system cycling and comfort.
- Adjustable Second Stage Heat Offset: Fine-tune the activation point for the second stage of heating in compatible systems.
- Selectable Smart Recovery: This feature allows the thermostat to learn how long it takes to reach a desired temperature, activating the system early to ensure the target temperature is met by the start of your programmed period.
4. Maintenance
Regular maintenance ensures optimal performance and longevity of your thermostat.
4.1. Battery Replacement
The thermostat uses two "AA" alkaline batteries. When the battery indicator appears on the display, replace both batteries promptly. Low batteries can affect thermostat operation and lead to system malfunctions. Ensure proper polarity when inserting new batteries.
4.2. Air Filter Monitor
The LTX700U-A04 includes an air filter monitor feature. This reminds you when it's time to check or replace your HVAC system's air filter, promoting better air quality and system efficiency. Refer to your system's manual for filter replacement instructions.
5. Troubleshooting
If you encounter issues with your thermostat, try the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Low or dead batteries; no power from HVAC system. | Replace batteries. Check circuit breaker for HVAC system. Ensure proper wiring connections. |
| Thermostat not responding to settings. | Keyboard lock engaged; incorrect mode (Heat/Cool/Off); wiring issue. | Deactivate keyboard lock. Verify system mode. Check wiring connections. |
| System (heating/cooling) not turning on. | Incorrect temperature setting; system mode incorrect; safety lockout; wiring issue. | Adjust set temperature. Ensure thermostat is in Heat or Cool mode. Wait 5 minutes for system to reset after power cycle. Verify wiring. |
| Temperature readings seem inaccurate. | Thermostat located near heat source/draft; internal sensor issue. | Ensure thermostat is not exposed to direct sunlight, drafts, or heat sources. If problem persists, contact support. |
| Programming is not holding. | Manual Hold active; power interruption; programming error. | Cancel Manual Hold. Re-enter program settings carefully. Ensure stable power supply. |
For issues not listed here or if troubleshooting steps do not resolve the problem, please contact LUX customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | LUX |
| Model Number | TX700U (LTX700U-A04) |
| Controller Type | Remote Control (via buttons) |
| Special Features | Auto Changeover, Programmable (7-Day) |
| Temperature Control Type | Programmable |
| Included Components | 7-Day Programmable Thermostat |
| Power Source | Battery Powered (2 AA batteries required, not included) / System 24V AC |
| Voltage | 230 Volts (System Compatibility) |
| Display Type | LCD with Backlight |
| Control Type | Button Control |
| Mounting Type | Wall Mount |
| Product Dimensions | 7.1 x 1.38 x 10.9 inches |
| Item Weight | 8.1 ounces |
| UPC | 021079157006 |
| Manufacturer | EME Delaware |
7. Warranty and Support
7.1. Limited Warranty
The LUX LTX700U-A04 Thermostat comes with a 3-Year Limited Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. For full warranty terms and conditions, refer to the documentation included with your product or visit the manufacturer's website.
Figure 7: Product features highlighting the 7-day/5-2 day programming, battery/system power, 2 heat/1 cool stages, and the 3-year limited warranty.
7.2. Customer Support
For technical assistance, troubleshooting, or warranty inquiries, please contact LUX customer support. You can find contact information on the official LUX website or within the product packaging.
Manufacturer: EME Delaware
