1. Introduction
The AVATTO WT420-16A intelligent temperature controller is a versatile smart thermostat designed for various heating systems. It supports electric heating systems (controlling heating cables, electric heating film electric radiators) and water heating systems (controlling electric actuators, valve drivers, or circulating water pumps). This manual provides detailed instructions for installation, operation, and maintenance of your WT420 thermostat.
2. Specifications
| Parameter Item | Parameter | Parameter Item | Parameter |
|---|---|---|---|
| Brand Name | AVATTO | Model Number | WT420 |
| Power Supply | 90-250VAC 50/60Hz | Output Load | 16A output |
| Wattage | 2000W | Certification | CE |
| 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 |
| Origin | Mainland China | High-concerned chemical | None |
Package Dimensions
- Length: 12 cm
- Width: 12 cm
- Height: 8 cm
- Weight: 0.25 kg
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
- Use a straight screwdriver to align with the buckle position and remove the display panel.
- Connect the wires according to the 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.
- Fasten the display panel to the buckle position.
3.3 Mobile App Installation
To control your thermostat remotely, download and install the companion mobile application:
- Scan the QR code provided in the comprehensive diagram (or search for "Graffiti Smart" or "Smart Life" in your app store) to download, install, and register the app.
- Ensure your phone has a 2.4GHz Wi-Fi network and Bluetooth enabled during the download, installation, and registration process.
3.4 Network Configuration
Once the app is installed, connect your thermostat to your Wi-Fi network:
- When the device is powered off, long-press the energy-saving button until the Wi-Fi icon on the thermostat flashes.
- Open the "Graffiti Smart" or "Smart Life" app and follow the on-screen instructions to configure the network.
- A constantly lit Wi-Fi icon on the thermostat indicates a successful network connection.
3.5 Device Sharing
To share control of the thermostat with other family members:
- On the thermostat control main interface of the app, tap the "Share" icon (often represented by three dots or a sharing symbol).
- Select "Shared Device" and follow the prompts to share access.
4. Operating Instructions
4.1 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 temperature range for energy-saving mode to 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. |
4.2 Button Description
| Button | Function |
|---|---|
| Power Key | Short press: Turn device on/off. In Advanced Options: Save settings and exit. From powered-off state, press and hold: Enter Advanced Options. |
| Mode Key | Short press: Switch modes. Press and hold for 3 seconds: Activate child lock. |
| Slider | Slide up/down to increment/decrement values. |
4.3 Sliding Groove Adjustment
The thermostat features a sliding groove mechanism for quick temperature adjustments. Simply slide the groove up or down to change the temperature. Pressing the top or bottom of the groove can also increase or decrease the temperature.
4.4 Programmable Weekly Schedule & Time Period
The thermostat supports flexible programming to match your weekly routine. You can set schedules for 5+2, 6+1, or 7 days a week, with multiple time slots per day.
- Weekdays (Monday to Friday): Up to 6 time slots for different temperature settings.
- Rest Days (Saturday to Sunday): Up to 2 time slots for different temperature settings.
Programming is done via the mobile application after the thermostat is connected to the network.
| 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 Backlight Brightness Adjustment
The thermostat's backlight brightness can be adjusted or turned off completely to avoid disturbing sleep. This setting is typically controlled via the mobile application.
4.6 Precise Temperature Control
The WT420 thermostat offers precise temperature management with configurable settings:
- Temperature Hysteresis: 0.5°C to 3°C
- Minimum Temperature Setting: 0.5°C
- Upper and Lower Limits of Temperature: 5°C to 70°C
4.7 Advanced Options Settings
Advanced settings allow for fine-tuning the thermostat's behavior. To access these settings:
- When 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 advanced menu options.
- Slide the bar to select the desired parameter value. Each press of the Mode button switches to the next advanced menu parameter.
- Continuous pressing will return to the first item in the advanced menu settings.
- Press the Power button to save and exit the advanced menu settings, or the system will automatically exit after 20 seconds of inactivity and return to the powered-off interface.
| 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 the main mode, with floor temperature control as a 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; |
5. Maintenance
5.1 Anti-frost Function (Low Temperature Protection)
The thermostat includes an anti-frost feature to prevent pipes from freezing. If the indoor temperature drops below 5°C, the thermostat will automatically activate heating. Heating will cease once the indoor temperature rises to 8°C.
5.2 Window Opening Function
This feature helps save energy by temporarily pausing heating when a window is open. To enable this function, select 'ON' for item 5 in the Advanced Options. If the temperature drops by 5°C within 5 minutes, the system will detect an open window and stop heating output.
5.3 Equipment Upgrade
The thermostat's firmware can be updated via the mobile application to enhance functionality. To check for and install updates:
- On the main interface of the app's thermostat control, tap the "Settings" or "More" icon (often represented by three dots or a gear symbol).
- Look for a "Device Upgrade" or "Firmware Update" option.
- Follow the on-screen prompts to confirm and initiate the upgrade.
6. Troubleshooting
- Wi-Fi Icon Flashing: Indicates the thermostat is in network configuration mode, attempting to connect to Wi-Fi. Ensure your router is on and the app is running the connection process.
- Absence of Wi-Fi Icon: Signifies a network disconnection. Check your Wi-Fi router and ensure the thermostat is within range. Re-attempt network configuration if necessary.
- Thermostat Not Responding: Check the power supply. If the device is powered on but unresponsive, try restarting it by turning off and on the power.
- Incorrect Temperature Readings: Verify the temperature calibration setting in the Advanced Options. Adjust if needed. Ensure the NTC sensor is correctly installed and functioning.
- Heating Not Activating: Check if the heating icon is displayed. Ensure the thermostat is not in energy-saving mode with a very low set temperature, or if the window opening function has been triggered.
- Restoring Factory Settings: If issues persist, you can restore the thermostat to its factory default settings. Press and hold the energy-saving button for 5 seconds until the display indicates a factory reset.
7. User Tips
- Optimal Placement: Install the thermostat away from direct sunlight, drafts, or heat sources (like lamps or appliances) to ensure accurate temperature readings.
- Leverage Scheduling: Utilize the weekly programming feature to automate temperature changes based on your daily and weekly routines, maximizing comfort and energy efficiency.
- Smart Home Integration: Connect your AVATTO thermostat with Alexa or Google Home for convenient voice control. This allows you to adjust temperatures without physically interacting with the device or app.
- Child Lock: Use the child lock function to prevent unintended changes to settings, especially in households with children. Activate it by pressing and holding the Mode button for 3 seconds.
- Energy Saving Mode: Take advantage of the ECO energy-saving mode to maintain a comfortable temperature range while minimizing energy consumption.
8. Warranty and Support
For any technical support, warranty claims, or further inquiries, please contact the AVATTO Smart Home Store directly through your purchase platform or their official support channels.
A detailed user manual in PDF format is also available for download: View User Manual (PDF)