1. Introduction
The YHNNH Digital Central Air Conditioning FCU Thermostat AE-T7K is a weekly programmable temperature controller designed for fan coil units in central air conditioning systems. This Wi-Fi enabled thermostat allows for precise temperature adjustment, mode switching, and fan speed control, enhancing comfort and energy efficiency. It features a high-definition LCD screen for clear display of operating status and supports control via the Tuya or Smart Life mobile applications.
2. Product Features
- Temperature Adjustment: Accurately set target temperatures via the panel or app to achieve desired indoor climate.
- Mode Switching: Offers multiple operating modes including cooling, heating, and ventilation to suit various needs and scenarios.
- Wind Speed Control: Adjustable fan speed levels (high, medium, low, auto) for personalized air circulation.
- Display Information: High-definition LCD screen displays real-time temperature, mode, fan speed, time, and day.
- Weekly Programmable: Supports flexible timer programming for energy and cost savings.
- Wi-Fi Connectivity: Remote control via Tuya or Smart Life app, and compatibility with voice control systems.
- Child Lock: Prevents unauthorized changes to settings.
3. Package Contents
Upon opening the package, verify that all components are present and undamaged.
- YHNNH Digital FCU Thermostat (AE-T7K)
- Mounting Screws
- User Manual
This image shows the typical package contents: the YHNNH digital thermostat, an instruction manual, and a small bag containing mounting screws for installation.
4. Installation
Installation of the YHNNH FCU Thermostat should be performed by a qualified electrician to ensure safety and compliance with local electrical codes. Always turn off the main power supply before beginning any installation work.
4.1 Wiring Diagram (4 Pipes, Three Speed Fan)
Refer to the following diagram for correct wiring connections for a 4-pipe system with a three-speed fan coil unit.
This diagram illustrates the wiring connections for a 4-pipe, three-speed fan coil unit system. It shows connections from the thermostat to the AC 95-220V power supply, coil fan, cold valve, and hot valve. Ensure all connections are secure and follow local electrical codes.
4.2 Mounting the Thermostat
- Ensure the power supply is disconnected.
- Separate the front panel from the backplate.
- Mount the backplate to a standard electrical box using the provided screws.
- Connect the wiring according to the diagram in Section 4.1.
- Carefully reattach the front panel to the backplate.
- Restore power to the system.
This image provides the physical dimensions of the YHNNH thermostat. The front panel measures 86mm x 86mm, and the depth from the front to the back of the wall mount is 25mm, with an additional 11.5mm for the front display.
5. Basic Operation
The thermostat features an intuitive interface with an LCD display and touch buttons for easy control.
This image shows the front of the YHNNH digital thermostat with its LCD screen displaying the current room temperature (30.5°C), set temperature (14.5°C), time (15:43), day (THU), and mode (COOL ON). Below the screen are buttons for SET, fan speed, and temperature adjustment (up/down).
5.1 Power On/Off
Press the power button (usually indicated by a circle with a vertical line) to turn the thermostat on or off.
5.2 Setting Temperature
Use the Up (▲) and Down (▼) arrow buttons to adjust the desired set temperature. The set temperature will be displayed on the screen.
5.3 Changing Mode
Press the Mode button (often labeled 'M' or an icon representing modes) to cycle through available modes: Cooling, Heating, and Ventilation.
5.4 Adjusting Fan Speed
Press the Fan Speed button (often indicated by a fan icon) to select between High, Medium, Low, or Automatic fan speeds.
6. Wi-Fi Setup and App Control
The Wi-Fi version of the AE-T7K thermostat can be controlled remotely using the Tuya or Smart Life mobile applications. This allows for convenient management of your climate from anywhere.
6.1 App Download and Account Creation
- Download the 'Tuya Smart' or 'Smart Life' app from your smartphone's app store (Google Play Store for Android, Apple App Store for iOS).
- Register for a new account or log in with an existing one.
6.2 Pairing the Thermostat with the App
- Ensure your thermostat is powered on and within range of your 2.4 GHz Wi-Fi network. (5 GHz networks are not supported).
- In the app, tap '+' to add a new device.
- Select 'Thermostat' or search for the device type.
- Follow the on-screen instructions to put the thermostat into pairing mode (usually involves pressing and holding a button on the thermostat until a Wi-Fi indicator blinks rapidly).
- Enter your Wi-Fi network password in the app.
- The app will scan for and connect to the thermostat. Once connected, you can rename the device.
This image demonstrates the Wi-Fi connectivity of the YHNNH thermostat. It shows the thermostat communicating with a Wi-Fi router, which in turn connects to a smartphone running the control app and voice control devices like Amazon Alexa or Google Home, enabling remote and voice-activated control.
6.3 App Control Demonstration Video
This video provides a step-by-step guide on how to connect the YHNNH Digital Central Air Conditioning FCU Thermostat to a Wi-Fi network and control it using the smartphone application. It shows the pairing process and how to adjust settings remotely.
7. Weekly Programming
The thermostat supports weekly programming, allowing you to set different temperature schedules for various times of the day and days of the week. This feature helps optimize comfort and energy consumption.
This image illustrates the 'Freely Timer Programming' feature of the YHNNH thermostat, accessible via the smartphone app. It shows various scheduled settings for different times of the day, such as 'waking up', 'lunch break', 'indoor activities', and 'sleeping time', allowing users to optimize energy and cost savings.
7.1 Accessing Programming Settings
Programming is typically managed through the connected mobile application (Tuya or Smart Life). Navigate to the thermostat's settings within the app and look for 'Time Period Programming' or 'Schedule' options.
7.2 Setting Schedules
- Select the day(s) of the week you wish to program (e.g., weekdays, weekends, or individual days).
- Define time periods (e.g., morning, daytime, evening, night).
- For each time period, set the desired temperature and operating mode (heating/cooling).
- Save your programmed schedule. The thermostat will automatically follow these settings.
8. Maintenance
The YHNNH FCU Thermostat requires minimal maintenance to ensure optimal performance.
- Cleaning: Gently wipe the screen and exterior with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Firmware Updates: Periodically check the Tuya/Smart Life app for available firmware updates to ensure your thermostat has the latest features and security enhancements.
- Sensor Care: Ensure the thermostat's built-in NTC sensor is not obstructed, as this can affect temperature readings.
9. Troubleshooting
If you encounter issues with your thermostat, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat not powering on | No power supply; incorrect wiring | Check circuit breaker; verify wiring connections (refer to Section 4.1). |
| Incorrect temperature reading | Sensor obstruction; calibration needed | Ensure sensor is clear; check app settings for temperature calibration. |
| Wi-Fi connection issues | Incorrect password; 5 GHz network; distance from router | Re-enter password; ensure 2.4 GHz network is used; move closer to router or use a Wi-Fi extender. |
| Thermostat not responding to app | App not updated; network issue; device offline | Update app; check Wi-Fi connection; restart thermostat and app. |
| Child Lock active | Settings locked | Unlock via the app or by following specific button combinations on the thermostat (refer to app settings for details). |
If the problem persists after attempting these solutions, contact customer support for further assistance.
10. Specifications
- Model Number: AE-T7K
- Brand: YHNNH
- Voltage Range: 95V-230V
- Wattage: 5W
- Relay Output: 3A
- Screen Size: 2.8 Inch
- Sensor: Built-in NTC Sensor
- Wireless Frequency: 2.4Ghz
- Network Standard: 802.11 bgn
- Temperature Setting Range: 5-35°C (Manual adjustment)
- Shell Material: PC + ABS flame retardant
- Certification: CE
- Compatible Apps: Tuya or Smart Life
- Item Weight: 1.76 ounces
- Package Dimensions: 0.39 x 0.39 x 0.39 inches
11. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or contact the retailer/manufacturer directly. Keep your purchase receipt as proof of purchase.
