Honeywell MP516A1087 Damper Actuator

The Honeywell MP516A1087 Pneumatic Unit Ventilator Damper Actuator is a heavy-duty, rolling-diaphragm actuator designed for proportional control of unit ventilator dampers. Engineered for reliability in institutional HVAC systems, this spring return pneumatic actuator features an 11 square inch effective diaphragm area and a versatile 2-1/8 to 2-1/2 inch stroke length. It operates on a 3-12 PSI spring range with a specific hesitation sequence: the lever arm moves to the minimum position between 0-3 PSI, hesitates from 3-8 PSI to allow for precise sequencing, and completes the full stroke between 8-12 PSI. Built to withstand environment extremes, it handles temperatures from -20 to 160°F and utilizes 1/8" NPT air connections for standard field-serviceable pneumatic installations. This model is functionally identical to the MP516A1087/U, ensuring a direct drop-in replacement for Honeywell damper motor repair and maintenance in school or office ventilation units.

• Precise Sequencing: Built-in hesitation range (3-8 PSI) allows for coordinated control of outdoor and return air dampers without extra relays.
• Robust Construction: The 11 sq. in. diaphragm provides consistent torque and linear force throughout the entire 2-1/2 inch stroke.
• Environmental Resilience: Rated for high-humidity environments (5-95% RH) and wide temperature swings common in mechanical rooms.
• Easy Integration: Standard 1/8" NPT ports and a universal lever arm design simplify the replacement of legacy unit ventilator actuators.
• Fail-Safe Operation: Mechanical spring return ensures the damper returns to a known safety position upon loss of control air pressure.

What is the difference between the MP516A1087 and the MP516A1087/U?
There is no functional or technical difference; the "/U" suffix simply denotes a master-pack or universal trade version of the same Honeywell factory component.

Can this actuator be used in high-heat applications?
Yes, the unit is rated for ambient operating temperatures up to 160°F, making it suitable for unit ventilators located near steam or hot water coils.

How does the hesitation feature work in a sequence of operation?
The actuator is designed to hold its position during the 3-8 PSI pressure change, which is typically used to allow a secondary cooling or heating valve to modulate before the damper fully opens or closes.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.