1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of the WelTe LOA24.171B27 Burner Program Controller. This device is designed as a mechanical control box and serves as a replacement for various burner PLC control boxes, including certain Siemens and Sudik models (e.g., LOA21..., LOA24..., BH064...). Please read this manual thoroughly before attempting any procedures.
Figure 1: WelTe LOA24.171B27 Burner Program Controller
2. Specifications
| Feature | Specification |
|---|---|
| Model Number | LOA24.171B27 |
| Voltage | 220-240V~ |
| Frequency | 50-60Hz |
| Power Consumption | 3VA |
| Max. Ignition Time (ts max.) | 10 seconds |
| Material | Plastic |
| Origin | Mainland China |
| Package Included | Yes |
3. Safety Information
Always observe the following safety precautions to prevent personal injury or damage to the equipment:
- Installation and maintenance should only be performed by qualified personnel.
- Disconnect all power to the burner system before installing, servicing, or removing the controller.
- Ensure proper grounding to prevent electrical shock.
- Verify that the supply voltage and frequency match the specifications of the controller (220-240V~, 50-60Hz).
- Do not operate the controller if it appears damaged.
- Keep the controller dry and free from dust and debris.
4. Installation and Setup
The LOA24.171B27 Burner Program Controller consists of two main parts: the control module and its dedicated wiring base (socket). The control module plugs into the wiring base, which is permanently wired into the burner system.
4.1 Disassembly and Assembly Overview
Video 1: Demonstration of separating and connecting the controller module to its wiring base.
4.2 Wiring Base Installation
- Mounting: Securely mount the wiring base in the designated control panel or burner housing. Ensure adequate space for wiring and ventilation.
- Wiring: Connect the burner system's electrical wiring to the screw terminals within the wiring base. Refer to the burner manufacturer's specific wiring diagram for correct connections. The base features multiple terminals for various inputs and outputs.
Figure 2: Wiring base with screw terminals
Figure 3: Top view of the wiring base
4.3 Controller Module Installation
- Alignment: Carefully align the pins on the bottom of the LOA24.171B27 control module with the corresponding slots in the installed wiring base.
- Insertion: Gently push the control module into the wiring base until it is fully seated and secure. Ensure a firm connection.
Figure 4: Bottom view of the controller module pins
After installation, double-check all connections and ensure the module is securely in place before restoring power.
5. Operation
The WelTe LOA24.171B27 Burner Program Controller manages the ignition and supervision sequence of oil or gas burners. Once correctly installed and powered, it automatically initiates the burner's startup sequence, monitors flame presence, and ensures safe operation. The controller's internal logic handles pre-purge, ignition, and post-purge phases according to established safety standards.
- Power On: Upon receiving power, the controller will begin its programmed startup sequence.
- Ignition: The controller will activate the ignition system for a maximum of 10 seconds (ts max. 10sec.) to establish a flame.
- Flame Supervision: Continuous monitoring of the flame is performed during burner operation.
- Safety Shutdown: In case of flame failure or other detected faults, the controller will initiate a safety shutdown and lock out the burner.
6. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of your burner system and the LOA24.171B27 controller.
- Visual Inspection: Periodically inspect the controller and its wiring for any signs of damage, corrosion, or loose connections.
- Cleaning: Keep the controller free from dust, dirt, and moisture. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Professional Check: It is recommended to have the entire burner system, including the program controller, inspected by a qualified technician annually.
7. Troubleshooting
If the burner system fails to operate correctly, consider the following basic troubleshooting steps. Always disconnect power before inspecting any electrical components.
- No Power: Check the main power supply to the burner system and ensure all circuit breakers are on.
- Burner Fails to Start: Verify that the controller is securely seated in its wiring base. Check all wiring connections for tightness.
- Flame Failure/Lockout: This indicates a problem with flame establishment or detection. Inspect the flame sensor and ignition electrodes. Ensure fuel supply is adequate.
- Error Codes: If the burner system provides diagnostic error codes, consult the burner manufacturer's manual for specific interpretations related to the LOA24.171B27 or equivalent controllers.
For persistent issues, contact a qualified burner technician.
8. User Tips
No specific user tips were available from customer reviews or Q&A for this product at the time of manual creation. General advice includes:
- Always ensure the replacement controller matches the specifications of the original part.
- Keep a spare unit if continuous operation is critical for your application.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase records handy when contacting support.
