Honeywell MP918B1089 Pneumatic Damper Actuator 8-13 PSI Spring Range

The Honeywell MP918B1089 is a high-force pneumatic damper actuator designed for proportional control of medium- to large-size dampers in commercial HVAC systems. This spring return actuator features a rolling diaphragm piston design that delivers reliable performance and long service life in demanding applications.

Key Features:

• Spring range: 8-13 PSI for precise control
• 3.5-inch stroke length with 23.8 sq. in. diaphragm area
• Rolling diaphragm operation for extended life and reliability
• Low friction shaft bearing for smooth operation
• Maximum pressure rating: 25 PSI
• Operating temperature range: -40°F to 158°F (-40°C to 71°C)
• Barbed 1/4-inch air connection
• Includes external mounting bracket, crank arm, and pushrod assembly

Technical Specifications:

• Actuator force at midstroke: 208 lb-in.
• Actuator force extended: 208 lb-in.
• Actuator force retracted: 333 lb-in.
• Close tolerance on operating range and stroke
• Non-overlapping spring ranges for sequencing applications

The MP918B series actuators position damper blades to control airflow through specific zones in Variable Air Volume (VAV) and other HVAC systems. Suitable for use with smoke dampers and low-leakage rated dampers, this actuator provides versatile mounting options and reliable positioning under varying load conditions.