Introduction
Thank you for choosing the QJWYO AC-112 Digital Waterproof Temperature Controller. This device is designed for precise temperature control in various applications, including aquariums and reptile enclosures. Please read this manual thoroughly before operation to ensure proper use and optimal performance.
Important Safety Information
- Ensure the power supply matches the device's requirements.
- Do not immerse the main unit in water. The sensor is waterproof, but the controller itself is not designed for submersion.
- Keep out of reach of children.
- Do not attempt to disassemble or repair the unit yourself. Contact qualified personnel for service.
- Always unplug the device before cleaning or performing maintenance.
Product Overview
The AC-112 is a microcomputer thermostat featuring a digital display and a waterproof sensor. It is equipped with both cooling and heating control functions.
Figure 1: Front view of the QJWYO AC-112 Digital Temperature Controller. It features a digital display, control buttons (H/C, SET, Up, Down), and an integrated power outlet. Various international plug adapters are displayed below the main unit, indicating its versatility.
Figure 2: Dimensional diagram of the AC-112 controller. The main unit measures 15.5 cm in length and 5.5 cm in width. The waterproof sensor cable is 0.8 meters long, and the power cord is 1.4 meters long. Key features like 0.1 degree precision and 1-second response time are highlighted.
Figure 3: Illustrative image showing the AC-112 controller's application in maintaining optimal temperatures for various pets, including reptiles and amphibians, emphasizing its suitability for aquariums and terrariums.
Specifications
| Model Number | AC-112 |
| Type | Temperature Controller |
| Display Type | Digital |
| Max Measuring Temperature | 0-150°C (as indicated in image, product description states 120°C & Above) |
| Temperature Precision | 0.1°C |
| Response Time | 1 second |
| Sensor Cable Length | 0.8m |
| Power Cord Length | 1.4m |
| Product Dimensions | 3.94 x 1.97 x 1.97 inches (approx. 10 x 5 x 5 cm) |
| Weight | 3.7 ounces (approx. 105 grams) |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Certification | CE, UL |
Setup Instructions
- Unpack the Device: Carefully remove the temperature controller and sensor from its packaging.
- Position the Controller: Place the main controller unit in a dry, stable location, away from direct sunlight or extreme temperatures. Ensure adequate ventilation.
- Install the Sensor: Submerge the waterproof temperature sensor into the environment where temperature needs to be monitored (e.g., aquarium water, reptile enclosure). Ensure the sensor is fully immersed or positioned correctly to get an accurate reading.
- Connect Heating/Cooling Device: Plug your heating or cooling appliance (e.g., heater, fan) into the power outlet on the front of the AC-112 controller.
- Power On: Plug the AC-112 controller's power cord into a suitable electrical outlet. The digital display will illuminate, showing the current temperature.
Operating Instructions
Setting the Desired Temperature:
- Press the SET button once. The display will flash, indicating it's in setting mode.
- Use the Up (▲) and Down (▼) buttons to adjust the desired temperature.
- Press SET again to confirm the setting and exit the setting mode. The display will return to showing the current temperature.
Setting Heating/Cooling Mode (H/C):
The AC-112 can operate in either heating or cooling mode. The mode determines whether the connected appliance turns on when the temperature is below or above the set point.
- Press and hold the H/C button for approximately 3 seconds. The display will show "H" for heating or "C" for cooling.
- Use the Up (▲) or Down (▼) buttons to toggle between "H" (Heating) and "C" (Cooling).
- Press H/C again briefly to confirm your selection.
Heating Mode (H): The connected device will turn on when the measured temperature falls below the set temperature and turn off when it reaches the set temperature.
Cooling Mode (C): The connected device will turn on when the measured temperature rises above the set temperature and turn off when it reaches the set temperature.
Temperature Calibration (Advanced):
If you suspect the temperature reading is inaccurate, you can calibrate the sensor. Refer to the specific instructions provided with the device or contact support for detailed calibration procedures, as this may involve specific button combinations not explicitly detailed here.
Maintenance
- Cleaning: Disconnect the power before cleaning. Wipe the controller's surface with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Sensor Care: Periodically check the temperature sensor for any buildup or damage. Clean gently if necessary.
- Storage: If storing the device for an extended period, unplug it, clean it, and store it in a dry, cool place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is off | No power supply | Check power connection and wall outlet. |
| Temperature reading is inaccurate | Sensor dirty or improperly placed; calibration needed | Clean sensor, ensure proper placement. Perform calibration if necessary (refer to advanced settings). |
| Connected appliance not turning on/off | Incorrect H/C mode; set temperature not reached; appliance malfunction | Verify H/C mode setting. Check if the current temperature is within the trigger range. Test the connected appliance independently. |
| Display shows "HHH" or "LLL" | Sensor error (e.g., disconnected, damaged, out of range) | Check sensor connection. If error persists, the sensor may be damaged and require replacement. |
Warranty and Customer Support
For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official QJWYO website. Please have your model number (AC-112) and purchase date available when contacting support.
Manufacturer: QJWYO
Date First Available: November 26, 2025