Model UM, Servo Actuator

The actuator opens, modulates, and closes the valves and/or dampers in accordance with the integrated combustion control and burner management system programs. An integral interlock switch provides proof of open or closed position for safe burner operation. In addition, the feedback potentiometer provides indication of the motor’s shaft position. The UM Actuator is used on boiler control applications that have a maximum of 720 ft-lbs torque required. For heavier-duty service – consult the factory.

Operation: The Model UM Actuator utilizes an instantly reversible motor to rotate a stainless steel output shaft through a reduction of precision worm gears. The output shaft actuates four adjustable cam operated switches: two (2) travel limit switches to stop motor operation at pre-selected positions and two (2) auxiliary switches to provide valve and damper position proving interlocks. The actuator incorporates ‘Built-in Motor Design’, by which the stator of motor is directly inserted into the body housing, which works as a heat sink – efficiently radiating motor heat to atmosphere therefore the actuator can be stopped, started, or instantly reversed at any time within its travel without overheating or loss of power. For maximum durability, all the major parts of the actuator are lubricated with long life di-sulphate molibdenem grease (MOS2) at assembly therefore re-lubrication is in principle not required.