Honeywell Actuator B2-5S5 LKS131-07

The Honeywell LKS131-07 (B2-5S5) actuator is a servo motor designed for installation on multistage or modulating diesel burners, specifically for air flap control. It operates on a supply voltage of 200–240 V, with a 90-degree opening time of 5 seconds and a torque of 60 Nm. The actuator features a reversible synchronous motor, power consumption of 9 W, and protection class IP40. It includes stepless cam adjustment, a jointly rotating scale for position indication, and a maintenance-free cylindrical gear transmission. The output shaft is standard plastic with an inner square of 8 mm, and the unit weighs 500 g with dimensions of 10x6x8.5 cm. It complies with EU directives 73/23/EU and 93/68/EU.

When selecting an actuator of this type, ensure the supply voltage, torque, and opening time match the burner's requirements. The shaft type and dimensions must be compatible with the existing linkage or damper. Mounting is typically from the inside using through holes with M5 thread. Verify the protection class suits the installation environment. Always compare the electrical connection (e.g., 9-pin connector) with the burner's control system.

Common failures include motor burnout due to voltage spikes or overheating, gear wear causing erratic movement, and cam misalignment leading to incorrect switch activation. Symptoms may include the flap not opening or closing fully, intermittent operation, or failure to reach the set position. Check for loose connections, damaged gears, and proper cam adjustment.