1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your LEDLUX LL0251B Wi-Fi Thermostat. This intelligent thermostat is designed to control gas boilers and water heating radiators, offering remote management via a smartphone application and compatibility with Amazon Alexa and Google Home. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Safety Information
- Installation must be performed by a qualified electrician in accordance with local electrical codes.
- Disconnect power to the heating system at the main circuit breaker before installation or maintenance.
- Do not expose the thermostat to water or excessive humidity.
- Ensure the voltage supply (220V) matches the thermostat's requirements.
- Keep out of reach of children.
3. Package Contents
The package typically includes:
- LEDLUX LL0251B Wi-Fi Thermostat
- Mounting Bracket (Chinese standard 86x86mm box)
- User Manual (this document)
- Screws for installation
4. Product Overview
The LEDLUX LL0251B features a sleek design with a touch-sensitive LCD screen for easy interaction. It integrates Wi-Fi connectivity for remote control and smart home compatibility.
Figure 4.1: Front view of the LEDLUX LL0251B Wi-Fi Thermostat, showing the touchscreen display with current time, set temperature, room temperature, and control buttons (Power, Set, OK, Up, Down).
Figure 4.2: Detailed explanation of the thermostat's screen interface, indicating elements like 6-period program, time, cloud connection, Wi-Fi signal, NTC floor sensor, automatic mode, weekly program choice, manual mode, holiday mode, lock, week, setting temperature, room temperature, and heating mode.
5. Setup and Installation
5.1 Wiring
WARNING: Disconnect all power to the heating system before attempting any wiring. Incorrect wiring can cause damage to the thermostat, heating system, or personal injury.
The thermostat is designed for 220V systems and is compatible with gas boilers and water heating radiators. Refer to the wiring diagrams below for proper connection.
Figure 5.1: Back view of the thermostat with wiring terminals labeled AC230V, Imax16A, WIFI, N, L, NTC. Terminals 1-4 are for load (L1, N1), and 5-6 are for the NTC sensor.
Figure 5.2: Detailed wiring diagrams for 3A water heating (NO Type and NC Type) and 3A boiler valve (NO Type and NC Type). These diagrams illustrate connections for Live wire, Neutral wire, Thermal actuator, and NTC sensor to terminals 1-6.
- Identify the Live (L) and Neutral (N) wires from your power supply.
- Connect the Live wire to terminal 4 (L) and the Neutral wire to terminal 3 (N) on the thermostat.
- Connect the heating load (e.g., boiler or thermal actuator) to terminals 1 (L1) and 2 (N1) as per the specific wiring diagram for your heating system (NO or NC type).
- If using an NTC floor sensor, connect it to terminals 5 and 6.
- Ensure all connections are secure.
5.2 Mounting
The thermostat is designed to fit into a standard Chinese 86x86mm wall box.
- After wiring, gently push the thermostat into the wall box.
- Secure it with the provided screws.
- Ensure the thermostat is flush with the wall.
5.3 Wi-Fi Connection and App Pairing
To utilize remote control features, the thermostat must be connected to your Wi-Fi network and paired with the "Smart RM" application.
- Download the "Smart RM" app from your smartphone's app store (iOS or Android).
- Register or log in to your account.
- Follow the in-app instructions to add a new device. This typically involves putting the thermostat into pairing mode (refer to the thermostat's display for Wi-Fi icon status) and entering your Wi-Fi network credentials.
- Once connected, the Wi-Fi signal icon on the thermostat display will be solid.
5.4 Smart Home Integration (Alexa, Google Home)
The LEDLUX LL0251B thermostat is compatible with Amazon Alexa and Google Home for voice control.
Figure 5.3: The thermostat shown alongside Amazon Alexa and Google Home devices, indicating compatibility. The "Works with Tuya" logo suggests the thermostat uses the Tuya Smart platform, which is often integrated with these voice assistants.
- Ensure your thermostat is successfully paired with the "Smart RM" app.
- Open the Amazon Alexa app or Google Home app on your smartphone.
- Navigate to the "Skills & Games" section (Alexa) or "Works with Google" section (Google Home).
- Search for the "Smart RM" skill/service and enable it.
- Link your "Smart RM" account when prompted.
- Discover devices. Your thermostat should now appear and be controllable via voice commands.
6. Operating Instructions
6.1 Basic Controls
The thermostat features a touch-sensitive screen and buttons for direct control.
- Power Button (⏻): Turns the thermostat on or off.
- SET Button: Enters settings menu or confirms selections.
- OK Button: Confirms settings or selections.
- Up Arrow (▲): Increases temperature or navigates up in menus.
- Down Arrow (▼): Decreases temperature or navigates down in menus.
6.2 Setting Temperature
In normal operating mode, press the Up or Down arrow buttons to adjust the desired temperature. The new setting will be saved automatically after a few seconds.
6.3 Programming Schedules
The thermostat supports up to 6 programmable periods per day to maximize comfort and energy savings.
- Press the SET button to enter the programming menu.
- Use the Up/Down arrows to navigate through days and periods (P1, P2, P3, etc.).
- Press SET again to select a period, then use Up/Down to adjust the start time and desired temperature for that period.
- Press OK to confirm each setting.
- Repeat for all desired periods and days.
6.4 Operating Modes (Automatic, Manual, Holiday)
- Automatic Mode: The thermostat follows the programmed schedule. Indicated by an "AUTO" icon on the display.
- Manual Mode: Overrides the schedule, maintaining a constant temperature set by the user.
- Holiday Mode: Allows setting a specific temperature for an extended period (e.g., during vacation) to save energy.
Switch between modes using the SET button and Up/Down arrows, then confirm with OK.
6.5 Remote Control via App
Once paired with the "Smart RM" app, you can manage your thermostat remotely from anywhere with an internet connection.
Figure 6.1: The thermostat displayed next to a smartphone running the control application, illustrating the remote control capability. The app allows changing temperature and managing settings from a distance.
- View current room temperature and set temperature.
- Adjust temperature settings.
- Modify or create heating schedules.
- Switch between operating modes.
- Access advanced settings.
7. Maintenance
- Clean the thermostat screen and body with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ensure the thermostat is free from dust and debris to maintain optimal performance.
- No user-serviceable parts inside. Do not attempt to open or repair the device.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat not powering on | No power supply; incorrect wiring. | Check circuit breaker. Verify wiring connections (refer to Section 5.1). |
| Heating system not responding | Incorrect wiring; thermostat in wrong mode; heating system issue. | Verify wiring. Ensure thermostat is in Automatic or Manual mode with a set temperature above room temperature. Check heating system for faults. |
| Wi-Fi connection unstable or disconnected | Weak Wi-Fi signal; incorrect Wi-Fi password; router issues. | Ensure thermostat is within Wi-Fi range. Re-enter Wi-Fi password in the app. Restart your Wi-Fi router. |
| App cannot control thermostat | Thermostat not connected to Wi-Fi; app not linked; internet connectivity issues. | Verify Wi-Fi connection on thermostat. Ensure "Smart RM" app is linked and has internet access. |
| Inaccurate temperature readings | Thermostat placed near heat source/draft; sensor issue. | Relocate thermostat away from direct heat sources or drafts. If problem persists, contact support. |
9. Specifications
- Brand: LEDLUX
- Model Number: LL0251B
- Color: Black
- Voltage: 220 Volts
- Current (Max): 3A (for water heating/boiler valve)
- Connectivity: Wi-Fi
- Special Feature: Programmable
- Controller Type: Google Assistant (also compatible with Alexa)
- Control Type: Intelligent / Remote
- Mounting: Standard 86x86mm wall box
- Item Weight: 290 g
- Package Dimensions: 10.3 x 10.1 x 6.3 cm
- Components Included: Mounting Support
- Power Source: Mains Powered (220V)
10. Warranty and Support
For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your purchase receipt as proof of purchase.
