The Siemens SQN72 series burner servomotors are electromechanical actuators used for positioning and driving air dampers and gas control valves in oil and gas burners. These actuators regulate the combustion air supply and fuel flow depending on burner load conditions, ensuring efficient and stable burner operation.

The SQN72 series is designed mainly for small to medium-capacity industrial burners, where precise damper positioning is required to maintain proper combustion and burner safety.

The actuator includes a reversible synchronous motor with a gear train, allowing smooth rotation of the drive shaft. Adjustable cam switches allow the user to define specific positions such as ignition load, low fire, and high fire during burner operation.

These servomotors can be controlled directly through Siemens burner control units such as LOA, LMO, LME, or LFL controllers, or through external controllers like PID or P-PI regulators.

The SQN72 actuator also features a maintenance-free gear mechanism and a disengageable drive shaft, allowing manual adjustment during installation or maintenance.

Key Features

• Electromotoric actuator for air dampers and gas valves

• Designed for oil and gas industrial burners

• Load-dependent control of combustion air and fuel

• Adjustable cam switches and auxiliary contacts

• Maintenance-free gear train with manual disengagement

• Internal position indication system

• Heat-resistant and impact-proof housing

• Compatible with Siemens burner management systems

• Suitable for two-stage and modulating burner control

Applications

• Industrial gas burners

• Industrial oil burners

• Dual-fuel burner systems

• Steam boiler burners

• Thermal oil heaters

• Industrial furnaces and ovens

• Process heating equipment

Why Choose Siemens SQN72 burner servomotor?

• Reliable Siemens combustion control technology

• Accurate damper positioning for optimal combustion

• Compatible with multiple Siemens burner controllers

• Durable construction for industrial environments

• Easy commissioning and maintenance

• Long operational life with stable performance

Technical Description

The Siemens SQN72 burner servomotor uses a reversible synchronous motor combined with a mechanical gear system to control the position of air dampers and valves in industrial burner systems. The actuator adjusts combustion air or fuel flow depending on the required burner load.

The actuator contains an internal camshaft with adjustable cams that operate auxiliary switches. These switches allow the burner control system to trigger functions such as ignition positioning, low fire, and high fire during burner operation.

The servomotor can be integrated with different control methods including 1-wire, 2-wire, or 3-position control systems, allowing flexible integration with burner controllers or external PID regulators.

The actuator housing is made from impact-resistant and heat-resistant plastic, ensuring reliable operation even in demanding industrial combustion environments.

Technical Specifications