1. Introduction
The AVATTO WT420-16A is an intelligent temperature controller designed for various heating systems. It is compatible with electric floor heating, water heating, and gas boiler systems, allowing precise temperature control and smart home integration.
2. Specifications
| Parameter | Value |
|---|---|
| Model Number | WT420 |
| Brand Name | AVATTO |
| Power Supply | 90-250VAC 50/60Hz |
| Output Load | 16A output |
| Wattage | 3A/16A |
| Temperature Settability | ±0.5°C |
| Temperature Display Accuracy | ±0.5°C |
| Temperature Setting Range | 5°C-70°C |
| Ambient Temperature | 0°C~50°C |
| WIFI Communication Protocol | IP/TCP, MQTT |
| WIFI Frequency | 2.412GHz~2.484GHZ |
| Certification | CE |
| Origin | Mainland China |
3. Setup and Installation
3.1 Wiring Diagram
Important: Installation must be carried out by qualified professionals. All wiring must comply with local and national construction and electrical regulations and rules.
3.2 Installation Steps
Follow these steps to install the thermostat:
- Use a straight screwdriver to align with the buckle position and gently remove the display panel.
- Connect the wires according to the provided wiring diagram and fix the power supply part to the junction box with screws.
- Align the display surface shell with the power supply bottom shell and fasten it to the buckle position.
- Installation is now completed.
3.3 Mobile App Setup
To use the smart features, you need to set up the mobile application:
- Scan the QR code (usually found in the product packaging or quick start guide) on your phone to download, install, and register the "Graffiti Smart" or "Smart Life" app.
- Ensure your phone's 2.4G network and Bluetooth are enabled during the download, installation, and registration process.
- Enter the app after successful registration.
3.4 Connecting to Wi-Fi Network
To connect your thermostat to the Wi-Fi network:
- Ensure the device is powered off.
- Long press the energy-saving button on the thermostat until the Wi-Fi icon flashes on the display.
- Open the "Graffiti Smart" or "Smart Life" app on your phone.
- Follow the in-app instructions to configure the network.
- Once the Wi-Fi icon on the thermostat display is constantly lit (not flashing), it indicates a successful network connection.
4. Operating Instructions
4.1 Button and Display Overview
Display Description
| Icon | Description |
|---|---|
| Wi-Fi Icon | Constantly lit: successful networking. Flashing: adding network. Absence: network disconnection. |
| ECO Energy-saving Icon | Lights up to indicate activation of "energy-saving mode" (APP can set range 10-20°C, default 16°C). |
| Manual Mode Icon | Lights up to indicate activation of 'manual mode'. |
| Programming Mode Icon | Lights up to indicate activation of 'programming mode'. |
| Heating Icon | Lights up to indicate 'heating output'. |
| Child Lock Icon | Lights up to indicate activation of the "child lock" function. |
Button Description
| Button | Function |
|---|---|
| Power Key | Short press: Turn device on/off. In Advanced Options: Save settings and exit. Long press (from off state): Enter Advanced Options. |
| Mode Key | Short press: Switch modes. Long press (3 seconds): Activate child lock. |
| Slider | Slide up/down to increment/decrement values (e.g., temperature). |
4.2 Temperature Adjustment
The thermostat allows for precise temperature control. You can adjust the temperature by sliding your finger up or down the slider on the device, or by pressing the increase/decrease temperature buttons in the app.
4.3 Working Modes
The thermostat supports four distinct working modes:
- Manual Mode: Allows direct setting of the desired temperature.
- Programming Mode: Follows a pre-set weekly schedule.
- Programming Temporary Mode: Temporarily overrides the programming schedule for a set period.
- Energy Saving Mode: Optimizes temperature settings for energy efficiency.
4.4 Programmable Weekly Schedule
The thermostat allows for flexible scheduling to match your lifestyle. You can set up to 6 time slots on weekdays and 2 time slots on rest days, supporting different temperature settings for each period.
Programming Mode Operation (via APP)
In the startup state, after the temperature controller is connected to the network, programming settings can be made in the APP.
| Working days (Monday to Friday) | Rest days (Saturday to Sunday) | ||
|---|---|---|---|
| Time | Temperature | Time | Temperature |
| 6:00 morning | 20°C | 8:00 morning | 20°C |
| 8:00 go out | 16°C | ||
| 11:30 go home | 20°C | ||
| 12:30 go out | 16°C | ||
| 17:00 go home | 20°C | ||
| 22:00 evening | 16°C | 23:00 evening | 16°C |
4.5 Low Temperature Protection and Window Opening Function
- Low Temperature Protection: If the indoor temperature drops below 5°C, the thermostat will automatically activate heating. Heating will stop when the temperature rises to 8°C.
- Window Opening Function: This feature can be enabled in the Advanced Options (item 5). If the temperature drops by 5°C within 5 minutes, the system detects an open window and temporarily stops heating output to save energy.
4.6 Advanced Options Settings
To access and configure advanced settings:
- Ensure the device is powered off.
- Press and hold the Power button to enter the advanced options settings.
- Briefly press the Mode button to switch between different advanced menu options.
- Use the Slider to select the desired parameter value.
- Each press of the Mode button will cycle to the next advanced menu parameter. Continuous pressing will return to the first item.
- To save settings and exit, press the Power button. The system will also automatically exit after 20 seconds of inactivity.
Key Advanced Parameters:
| Serial Number | Parameter Name | Default Value | Functional Meaning |
|---|---|---|---|
| 1 | Temperature calibration | 0 | -9~9°C |
| 2 | Temperature control selection | IN | IN: Single room temperature mode control OU: Single floor temperature mode control AL: Dual temperature and dual control mode control (room temperature control is main mode, floor temperature control is secondary mode) |
| 3 | Start temperature difference | 0.5 | 0.5~3°C |
| 4 | Anti-freezing function | ON | OF: Turn off antifreeze function ON: Enable antifreeze function |
| 5 | Window opening function | ON | OF: Close the window opening function ON: Enable the window opening function |
| 6 | Set the upper temperature limit value | 40 | 21~70°C |
| 7 | Set the lower temperature limit value | 10 | 5~20°C |
| 8 | Upper limit of floor temperature | 40 | 21~70°C |
| 9 | Lower limit of floor temperature | 10 | 5~20°C |
| A | Standby backlight brightness | 1 | 0: Total darkness; 1:20%; 2:50%; 3:Full brightness |
| B | Energy saving mode temperature setting | 16 | 10~20°C |
| C | Load selection | 1 | 1:low(≤1.5KW); 2:centre(1.5-2.6KW); 3:high(2.6~3.5KW) |
| D | Program mode | 01 | OF: Turn off programming mode; 01: Weekends off; 02: Single day off; 03: No day off |
| E | Child Lock Mode | 1 | 1: Semi-lock; 2: Full-lock; |
| F | Restore factory settings | Press and hold the energy-saving button for 5 seconds, and it will display "---" to restore the factory settings. |
5. Maintenance
5.1 Equipment Upgrade Function
To ensure your thermostat has the latest features and improvements, you can upgrade its firmware via the mobile app:
- On the main interface of the APP thermostat control, look for the upgrade function (often represented by an icon like a gear or an arrow pointing up).
- Click on the upgrade function.
- Confirm the upgrade when prompted.
Regularly checking for updates can enhance the thermostat's performance and functionality.
6. Troubleshooting
6.1 Network Disconnection
If the Wi-Fi icon is absent from the thermostat's display, it indicates a network disconnection. Try the following:
- Check your home Wi-Fi router to ensure it is working correctly and broadcasting a 2.4GHz signal.
- Ensure the thermostat is within range of your Wi-Fi router.
- Attempt to reconnect the thermostat to the Wi-Fi network by following the steps in Section 3.4.
6.2 Resetting the Thermostat (Withdrawal Instructions)
If you encounter persistent issues or need to reset the network settings, you can perform a factory reset:
- Ensure the device is powered on.
- Press and hold the Power button until the screen is fully lit up and the Wi-Fi icon appears (or flashes).
- At this point, the control panel has reset the network, and the Wi-Fi icon will be flashing, indicating it's ready for re-pairing.
7. User Tips
- Heating Only: This thermostat is primarily designed for heating systems (electric floor heating, water heating, gas boilers). It does not support cooling functions.
- Professional Installation: Always ensure installation is performed by a qualified professional to comply with safety standards and local regulations.
- App Connectivity: For optimal smart features, ensure your Wi-Fi network is stable and operating on the 2.4GHz frequency band.
8. Warranty and Support
For detailed warranty information, technical support, or further inquiries, please refer to the official AVATTO website or contact their customer service.
A comprehensive user manual in PDF format is available for download: Download User Manual (PDF)