Honeywell MP904A5047

Product Name: MP904A Series Pneumatic Damper Actuator (Rolling Diaphragm)
Product Introduction: A heavy-duty pneumatic operator for large HVAC or combustion control dampers (e.g., >48 inch boiler air doors), using instrument air pressure to position blades proportionally.

Category: Honeywell

Description

Technical Specifications & Performance Parameters:
- Type: MP904A (includes integral positive positioner), Direct Acting
- Stroke: Factory set 3.5 in (89 mm), adjustable 2–3.5 in
- Spring Range: Adjustable 3–10 psi (20–70 kPa), typical 2–7 or 7–13 psi operation
- Max Safe Pressure: 25 psi (172 kPa)
- Force: Varies with pressure; approx. 150 lb @ 0 psi spring, up to 250 lb @ 18 psi (dependent on sub-model)
- Ambient Temp: -20°F to 160°F (-29°C to 71°C)
- Air Connection: 1/8″ NPT female with push-on for 5/32″ or 1/4″ tubing
Functional Features: Rolling neoprene diaphragm for low hysteresis; Universal mounting bracket (internal/external); Optional stroke start/stop kits; Positioner ensures accurate positioning against variable loads.
Material & Structural Characteristics: Cast aluminum housing; Stainless steel linkage hardware; Neoprene rolling diaphragm; Positioner with nozzle/flapper mechanism.
Working Principle: Instrument air enters positioner which compares feedback linkage position to 4–20mA (or pneumatic setpoint); adjusts output pressure to diaphragm chamber overcoming spring bias to move damper linkage.
Installation Requirements: Mount bracket securely to damper frame; Align linkage to avoid side loading; Install air supply filter-regulator-lubricator (FRL) upstream; Calibrate positioner zero/span.
Usage Precautions: Critical: Ensure clean, dry, oil-free instrument air to prevent freeze-ups and diaphragm degradation; Check for air leaks regularly; Spring failure mode is usually fail-close (verify application requirement); Do not exceed 25 psi.

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