The Siemens SQN3 and SQN4 series burner servomotors are compact electromechanical actuators designed to drive air dampers and gas control valves in oil and gas burner systems. These servomotors regulate the flow of combustion air and fuel based on burner load conditions, ensuring efficient and stable burner operation.

The SQN3/SQN4 series is typically used in small to medium-capacity industrial burners, where accurate positioning of the air damper is required to maintain proper combustion efficiency and safety.

These actuators can operate directly with burner control units such as LOA, LMO, LMG, and LFL series controllers, or in combination with PID controllers such as the RWF series for load-dependent combustion control.

The actuator includes a maintenance-free gear train, adjustable cam switches, and position indication, allowing easy configuration of burner positions such as ignition load, minimum load, and maximum load.

With a durable heat-resistant housing and reliable synchronous motor mechanism, the SQN3/SQN4 series is widely used in industrial boilers, furnaces, and burner systems.

Key Features

• Electromotoric actuator for air dampers and gas valves

• Designed for oil and gas industrial burners

• Suitable for small and medium-capacity burners

• Adjustable end switches and auxiliary cams

• Maintenance-free gear train with disengagement option

• Internal and external position indication

• Compatible with Siemens burner controllers

• Durable heat-resistant plastic housing

• Supports 1-wire, 2-wire, or 3-position control systems

Applications

• Industrial gas burners

• Industrial oil burners

• Steam boiler burners

• Thermal oil heaters

• Industrial furnaces

• Process heating equipment

• Combustion air control systems

Why Choose Siemens SQN3 / SQN4 burner servomotor?

• Reliable Siemens combustion control technology

• Accurate damper positioning for efficient combustion

• Compatible with multiple Siemens burner controllers

• Durable construction for industrial environments

• Easy installation and commissioning

• Long operational life with stable performance

Technical Description

The Siemens SQN3 / SQN4 burner servomotor uses a reversible synchronous motor with an integrated gear system to drive air dampers or fuel control valves in burner systems. The actuator adjusts the combustion air or fuel supply depending on burner load requirements.

The actuator contains adjustable cam switches and auxiliary contacts that allow precise switching points for burner functions such as ignition position, minimum load, and maximum load.

These servomotors can operate with 1-wire, 2-wire, or 3-position control systems, making them compatible with many burner control units and combustion control systems.

The device also features a disengageable gear mechanism, allowing technicians to manually adjust the actuator during installation or maintenance without damaging the gear system.

Technical Specifications