Walfront STC-3000 Digital Temperature Controller User Manual

1. Introduction

The Walfront STC-3000 is a smart series digital temperature controller designed for precise temperature management. It supports both cooling and heating functions, switching automatically as needed. This device is suitable for various applications requiring accurate temperature control, such as in farms, greenhouses, and refrigeration houses.

Key features include temperature measurement, display, and control, temperature calibration, lighting control, and a temperature sensor probe. It also offers a one-key recovery to factory default settings and a key lock function for security.

2. Safety Information

Please read all safety warnings and instructions carefully before installing and operating this device. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Ensure the power supply voltage matches the controller's specifications (110-220V AC).
• All wiring should be performed by a qualified electrician to prevent electrical hazards.
• Do not operate the device in wet or damp environments.
• Disconnect power before performing any wiring or maintenance.
• Keep the device away from flammable materials.
• This product has only Celsius display.

3. Product Overview

3.1 Features

• Digital temperature display with 0.1°C accuracy.
• Temperature control range: -55°C to 120°C (-67°F to 248°F).
• Automatic switching between heating and cooling modes.
• Temperature calibration function.
• One-key recovery to factory default settings.
• Key lock function to prevent accidental changes.
• Touch switch mode for user interaction.

3.2 Components

The STC-3000 temperature controller consists of the main unit and a temperature sensor probe.

Figure 3.2.1: Front view of the STC-3000 Digital Temperature Controller, showing the display and control buttons (SET, RST, Up, Down, OK).

Figure 3.2.2: Angled view of the STC-3000 controller, illustrating the main unit and the connected temperature sensor probe.

Figure 3.2.3: Diagram showing the physical dimensions of the STC-3000 controller: 3.34 inches (L) x 1.38 inches (W) x 2.56 inches (H).

4. Setup and Wiring

Proper wiring is crucial for the safe and correct operation of the STC-3000. Refer to the wiring diagram below.

Figure 4.1: Wiring diagram for the STC-3000. Terminals 1 and 2 are for power input (Powerinput). Terminals 3 and 4 are for the sensor (Sensor). Terminals 5 and 6 are for the load (Load).

Wiring Instructions:

1. Power Input (Terminals 1 & 2): Connect your 110-220V AC power supply to these terminals. Ensure the power is off before connecting.
2. Sensor Connection (Terminals 3 & 4): Connect the provided temperature sensor probe to these terminals. The sensor is non-polar, so connection order does not matter.
3. Load Output (Terminals 5 & 6): Connect the device you wish to control (e.g., heater, cooler) to these terminals. The controller acts as a switch for the load.

Note: This thermostat uses a single-pole relay. For 240V applications in regions like the USA where 240V is two 120V phases, only one phase of the load will be switched. Consider using an external dual-pole relay for complete power disconnection of the load if required by your application or local electrical codes.

5. Operating Instructions

5.1 Basic Operation

• Power On/Off: Press and hold the power button (usually located near the display) to turn the unit on or off.
• Display: The large LED display shows the current measured temperature.
• Key Lock/Unlock: To unlock the buttons for setting parameters, press and hold the "SET" button for approximately 5 seconds until the display changes or unlocks. The lock icon will disappear.

5.2 Setting Temperature Parameters

The STC-3000 allows you to set a target temperature and a hysteresis (difference) value to control the heating/cooling cycle.

1. Set Target Temperature:
   • Press the "SET" button once. The current set temperature will flash.
   • Use the "Up" (▲) and "Down" (▼) arrows to adjust the desired target temperature.
   • Press "OK" or wait a few seconds for the setting to be saved.
2. Accessing Advanced Settings (P-codes):
   • Press and hold the "SET" button for approximately 3-5 seconds until "P0" appears on the display.
   • Use the "Up" (▲) and "Down" (▼) arrows to navigate through the P-codes (P0, P1, P2, etc.).
   • Press "SET" again to enter a specific P-code setting.
   • Use "Up" (▲) and "Down" (▼) to adjust the value.
   • Press "OK" or "SET" to confirm and exit the P-code setting.

Common P-Codes:

5.3 Switching between Celsius and Fahrenheit

Although the product label may indicate Fahrenheit, this model primarily displays in Celsius. However, some units may have a hidden function to switch. To attempt to switch between Celsius (C) and Fahrenheit (F) display modes:

• With the unit powered on and unlocked, press and hold the gray space between the "SET" and "RST" buttons (or the "OK" button on some variants) for approximately 5 seconds.
• The display should switch between "C" and "F" indicators if this function is available on your specific unit.

6. Maintenance

The STC-3000 is designed for low maintenance. Follow these guidelines to ensure longevity:

• Cleaning: Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Sensor Care: Ensure the temperature sensor is clean and free from debris. Do not bend or damage the sensor cable excessively.
• Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
• Environment: Operate the controller within its specified temperature and humidity ranges.

7. Troubleshooting

If you encounter issues with your STC-3000, refer to the following common problems and solutions:

7.1 Factory Reset

To restore the controller to its factory default settings:

• With the unit powered on, press and hold the "RST" button for approximately 5 seconds.
• The display will briefly show "888" or similar, indicating the reset is complete.
• After resetting, you may need to reconfigure your desired temperature and other parameters.

8. Specifications

9. Warranty and Support

For warranty information and technical support, please contact Walfront customer service through their official channels or the retailer from whom you purchased the product. Keep your purchase receipt as proof of purchase.

For more information, you may visit the Walfront Store on Amazon.