ATMOS DA Screw Conveyor for Burner A25

Product detailed description

The ATMOS DA screw conveyor is an essential component for pellet burner A25 systems in residential and commercial heating applications. It is commonly used in solid fuel boilers and is specifically engineered to transport pellets from storage to the burner. Installers working in confined boiler rooms or retrofitting existing systems will find this conveyor suitable for a range of configurations. The conveyor must be sized carefully to maintain proper hose tension and installation angles for safe and efficient operation.

Correct installation involves selecting the appropriate length to ensure the connecting hose between the burner and the conveyor remains taut while adhering to minimum and maximum length constraints. The system is designed to operate with a 45° maximum incline, and the conveyor must be supported using either a fixed leg or a suspended chain depending on space limitations. This ensures stable operation and minimizes wear on components during long-term use.

Technical parameters

Diameter	75 mm
Weight	13.225 kg
Code	H0151
Brand	Atmos

The 75 mm diameter is critical for matching the flow rate of the burner and preventing clogging. The length options from 1500 to 4000 mm allow flexibility for different boiler layouts. The gear motor rating (25 W) determines the conveyor’s speed and torque, which must align with the burner’s feed requirements. These parameters are essential for ensuring compatibility with specific boiler models and for maintaining consistent fuel delivery.

Installation and connection

Installation begins by positioning the conveyor at the required angle, ensuring the slope does not exceed 45°. The support leg is adjusted to the correct height to achieve this angle and to keep the hose taut. In restricted spaces, the support leg can be replaced with the supplied chain, which allows the conveyor to be suspended from the ceiling. The hose between the burner and the conveyor should be at least 20 cm long (ideally 30–60 cm) to prevent strain and ensure safety. Maximum hose length should not exceed 1 m to avoid sagging or blockages. A secure connection between the conveyor and the burner is crucial to prevent leaks and misalignment. Common installation mistakes include incorrect angle settings and improper hose tension, both of which can lead to operational inefficiencies or system failure.

Compatibility and accessories

This screw conveyor is compatible with specific ATMOS boiler models, including D 14 P, C 18 SP, DC 18 SP, D 21 P, C 25 SP, DC 25 SP, D 25 P, DC 30 SPX, D 20 P, DC 32 SP, and others listed in the technical documentation. It is not suitable for combined boilers with modifications for pellet burners. The conveyor is supplied as a standalone unit but is an integral part of the A25 pellet burner system. Accessories include a support leg or chain for installation, depending on the available space. Related products such as the ATMOS A 25 burner and ATMOS A 25 with servo drive are often used in conjunction with this conveyor to form a complete fuel delivery system.

Technical background for designers

The screw conveyor operates using a gear motor that drives a helical screw within a cylindrical housing. As the screw rotates, it moves pellets along the length of the conveyor toward the burner. The 75 mm diameter and gear motor rating are chosen to match the flow characteristics of the pellets and the burner’s demand. The conveyor is constructed from durable materials suitable for handling biomass fuels. Its integration into the system requires careful alignment with the burner inlet to ensure smooth and continuous operation. Factors such as installation angle, hose length, and system pressure affect the conveyor’s performance and longevity. Proper design considerations include accounting for thermal expansion and vibration to prevent mechanical stress on the system.

Service and operation

Regular inspection of the conveyor’s connections and support structure is necessary to ensure continued stability and performance. The gear motor and screw should be checked for signs of wear or blockage, particularly after extended use. The hose should remain free of kinks and debris to maintain unobstructed flow. No specific service intervals are provided, but routine checks are recommended to identify potential issues early. Cleanliness of the conveyor and its components helps prolong service life and maintain operational efficiency.

Frequently asked questions

Can the conveyor be installed in a vertical position?
No, the maximum installation angle is 45°. Vertical installation is not supported and may cause mechanical stress or operational issues.

Is the conveyor compatible with all ATMOS boiler models?
No, it is only suitable for specific models such as D 14 P, C 18 SP, DC 18 SP, and others listed in the technical documentation. It is not suitable for combined boilers with modifications for pellet burners.

How is the support leg adjusted?
The support leg is adjusted to achieve the correct installation angle and to ensure the hose remains taut. The height is set so that the conveyor is inclined at no more than 45°.

Can the chain be used instead of the support leg?
Yes, in restricted spaces, the chain can be used to suspend the conveyor from the ceiling. The chain is included as part of the standard delivery.