1. Product Overview
The Riello RDB1 26 BF is a neutral oil burner designed for efficient and reliable heating applications. This model, part number 3513008, is engineered to reduce emissions and noise, offering a compact design relative to its performance capabilities. It features easy front-mounted installation and is compatible with a wide range of boilers available on the market.
Key features include:
- Burner Type: RDB1 70/90 neutral burner
- Power Output: 21-26 kW (70/90 BTU)
- Reduced Emissions: Designed for lower environmental impact.
- Quiet Operation: Engineered to minimize operational noise.
- Compact Design: Small footprint for versatile installation.
- Easy Installation: Front-mounted design for straightforward setup.

Figure 1: Front view of the Riello RDB1 26 BF Oil Burner. This image shows the main body and control panel of the burner.
2. Safety Information
Important: Read all safety warnings and instructions carefully before installing, operating, or performing maintenance on the Riello RDB1 26 BF oil burner. Failure to follow these instructions could result in property damage, serious injury, or death.
- Installation and maintenance must be performed by qualified and authorized personnel only, in accordance with local regulations and standards.
- Ensure the power supply to the burner is disconnected before any installation, maintenance, or repair work.
- Do not store flammable materials near the burner.
- Ensure adequate ventilation in the boiler room.
- Never operate the burner if it is damaged or malfunctioning.
- Keep children and unauthorized persons away from the burner area.
- In case of a fuel leak or unusual odor, immediately shut down the burner, ventilate the area, and contact a qualified technician.
3. Setup and Installation
The Riello RDB1 26 BF oil burner is designed for straightforward installation, but it is crucial that installation is carried out by a certified technician. This ensures proper function, safety, and compliance with all applicable codes and regulations.
3.1 Pre-Installation Checks
- Verify that the boiler is compatible with the RDB1 26 BF burner specifications.
- Ensure the fuel supply system is clean and free of contaminants.
- Check the electrical supply for correct voltage and grounding.
- Confirm adequate space for installation and future maintenance access.
3.2 Mounting the Burner
- Attach the burner to the boiler's mounting flange using the provided hardware. Ensure a secure and airtight seal.
- Adjust the blast tube length if necessary, according to boiler manufacturer specifications.
3.3 Fuel and Electrical Connections
- Connect the fuel lines to the burner, ensuring all connections are tight and leak-free.
- Wire the burner to the boiler's control system and power supply according to the wiring diagram provided in the full technical manual.
- Ensure proper grounding of the burner and all electrical components.

Figure 2: Side view of the Riello RDB1 26 BF Oil Burner, showing fuel line connections. This image highlights the compact dimensions and connection points.
4. Operating Instructions
Once installed and commissioned by a qualified technician, the Riello RDB1 26 BF burner operates automatically in conjunction with the boiler's control system.
4.1 Initial Start-up (Commissioning)
Initial start-up and commissioning must be performed by a qualified technician. This involves:
- Bleeding the fuel lines to remove air.
- Adjusting the air damper for optimal combustion.
- Checking ignition and flame detection.
- Performing combustion analysis to ensure efficient and clean burning.
4.2 Normal Operation
The burner will cycle on and off as required by the boiler's thermostat or control system to maintain the desired temperature. Observe the burner for any unusual noises or odors during operation.
4.3 Shutdown
- Temporary Shutdown: Turn off the boiler's main power switch.
- Extended Shutdown: In addition to turning off the main power, close the fuel supply valve to the burner.
5. Maintenance
Regular maintenance is essential for the efficient and safe operation of your Riello RDB1 26 BF oil burner. All maintenance procedures should be carried out by a qualified service technician.
5.1 Annual Service
It is recommended to have the burner serviced annually. This typically includes:
- Cleaning the burner head, electrodes, and nozzle.
- Replacing the fuel filter.
- Checking and adjusting combustion settings.
- Inspecting all electrical connections and wiring.
- Checking for fuel leaks.
- Lubricating moving parts as required.
5.2 User Checks (Monthly)
While professional service is critical, users can perform simple visual checks:
- Visually inspect the burner for any signs of damage or leaks.
- Listen for unusual noises during operation.
- Ensure the area around the burner is clear of obstructions and flammable materials.

Figure 3: View of the Riello RDB1 26 BF Oil Burner with cover removed, showing internal components. This image illustrates the complexity of the internal mechanisms requiring professional servicing.
6. Troubleshooting
This section provides basic troubleshooting steps for common issues. For complex problems or if these steps do not resolve the issue, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| Burner fails to start | No power supply, safety lockout, no fuel, faulty ignition. | Check power switch and circuit breaker. Reset burner lockout (if applicable). Check fuel tank level and fuel valve. Contact technician for ignition issues. |
| Burner starts but locks out quickly | No flame detected, dirty photocell, faulty nozzle, air in fuel line. | Ensure photocell is clean. Contact technician to check nozzle, bleed fuel line, or inspect flame sensor. |
| Excessive smoke or soot | Poor combustion, incorrect air/fuel mixture, dirty burner head. | Contact technician for combustion adjustment and cleaning. |
| Unusual noise during operation | Loose components, pump issues, motor bearing wear. | Immediately shut down the burner and contact a qualified technician for inspection. |
7. Specifications
Detailed technical specifications for the Riello RDB1 26 BF oil burner:
- Manufacturer: Riello
- Part Number: 3513008
- Model Type: RDB1 70/90
- Power Output: 21-26 kW (70/90 BTU)
- Item Weight: Approximately 9 kg
- Dimensions (H x L x D): 223.5 mm x 276 mm x 202 mm
- Blast Tube Length: 86 mm
- Blast Tube Diameter: 89 mm

Figure 4: Diagram illustrating the dimensions of the Riello RDB1 26 BF Oil Burner. This image provides a visual reference for the physical size and key measurements.
8. Warranty and Support
For information regarding the warranty period and terms for your Riello RDB1 26 BF oil burner, please refer to the documentation provided at the time of purchase or contact your authorized Riello dealer or installer.
For technical support, spare parts, or to locate a certified service technician, please visit the official Riello website or contact their customer service department.
Official Riello Website: www.riello.com