Greluma DC 12V Programmable Temperature Controller User Manual

1. Introduction

The Greluma DC 12V Programmable Temperature Controller is a versatile device designed for precise temperature monitoring and control. It features a dual-color LED display for simultaneous viewing of measured and set temperatures, and a waterproof NTC 10K sensor for reliable readings in various environments. This controller supports both heating and cooling modes, making it suitable for a wide range of applications.

Applications: This electronic thermostat can be widely used in smart home and industrial appliances, household appliances, automatic irrigation systems, office machinery, audio equipment, automotive applications, aquariums, and more.

2. Safety Information

• Ensure the power supply matches the device's voltage requirements (DC 12V).
• Do not expose the main control unit to water or excessive humidity, despite the waterproof probe.
• All wiring should be performed by a qualified individual to prevent electrical hazards.
• Disconnect power before making any connections or performing maintenance.
• Keep the device out of reach of children.

3. Product Features

• Wide Temperature Range: Measures from -50°C to 110°C (-58°F to 230°F).
• Dual-Color LED Display: Simultaneously displays measured temperature (red) and set temperature (blue).
• Waterproof NTC Probe: Equipped with a 10K 0.5% NTC waterproof sensor for reliable outdoor or submerged use.
• High Accuracy: Control precision of 0.1°C and reaction precision of 0.1°C.
• High Temperature Protection: Includes protection mechanisms for safe operation.
• Cooling/Heating Modes: Configurable for both temperature control applications.

4. Product Overview

The Greluma temperature controller consists of the main module with an LED display and control buttons, and an external NTC waterproof sensor probe.

5. Setup

5.1 Wiring Diagram

Proper wiring is crucial for the safe and correct operation of the temperature controller. Refer to the diagrams below for connection instructions.

Wiring Notes:

• Ensure the DC 12V input is connected to the correct positive (+) and negative (-) terminals.
• Connect the load (heating or cooling device) to the relay output terminals. The relay acts as a switch.
• For high-power loads, it is recommended to use the "Load and Temperature Control Different Power Wiring Diagram" to ensure stable operation and prevent damage to the controller.
• The NTC sensor probe should be connected to its dedicated input terminals.

6. Operating Instructions

6.1 LED Display Indicators

The dual-color LED display provides real-time information:

• Red LED: Displays the currently measured temperature.
• Blue LED: Displays the set target temperature.
• "LLL": Indicates that the sensor is open or disconnected.
• "HHH": Indicates that the measured temperature is outside the operational range (-50°C to 110°C). Ensure the environment or medium being measured is within this range.
• "---": Indicates that the module is protected due to high temperature.

6.2 Setting the Temperature

1. Press and hold the SET button for five seconds to enter the main configuration menu.
2. Use the STC(+) and C/F(-) buttons to navigate through parameters P0 to P8.
3. Once you have selected the desired parameter (e.g., P0 for heating/cooling mode), press the STC button. The LED display will flash.
4. Use the STC(+) and C/F(-) buttons to adjust the setting value.
5. Wait for 3 seconds after setting the value; the module will automatically save the parameters and exit the setting mode.

6.3 Programmable Thermostat Parameters

The following table details the programmable parameters (P0-P8) and their factory default settings:

7. Maintenance

• Regularly inspect all wiring connections to ensure they are secure and free from corrosion.
• Keep the main control unit clean and free of dust. Use a soft, dry cloth for cleaning.
• Periodically check the NTC sensor probe for any physical damage or buildup that might affect its accuracy. Clean the probe gently if necessary.
• Do not use abrasive cleaners or solvents on any part of the device.

8. Troubleshooting

• Display shows "LLL": This indicates an open circuit or disconnected sensor. Check the sensor's connection to the module. If the connection is secure, the sensor might be faulty and require replacement.
• Display shows "HHH": The measured temperature is outside the operational range (-50°C to 110°C). Ensure the environment or medium being measured is within this range.
• Display shows "---": The module has entered high-temperature protection mode. Allow the device to cool down. Check for proper ventilation around the module.
• Inaccurate Temperature Readings:
  • Verify the sensor is properly immersed or positioned in the area where temperature needs to be measured.
  • Check for any physical damage to the sensor cable.
  • Use the P4 (Temperature Correction) parameter to calibrate the reading if a known offset is observed.
• Controller not switching load:
  • Check the wiring connections to the load and power supply.
  • Ensure the set temperature and hysteresis (P1) are configured correctly for your desired heating or cooling operation.
  • Verify the P0 parameter is set to the correct mode (H for heating, C for cooling).

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the product packaging or contact Greluma customer service directly. Keep your purchase receipt for warranty claims.