Description
The Schneider Electric (Barber Colman) MK4-7121 is a heavy-duty pneumatic damper actuator engineered for reliable, precise damper control in commercial and industrial HVAC systems. Featuring a 20 square inch actuator diaphragm and an 8 to 13 PSI spring range, this unit delivers consistent positioning performance across a wide range of building automation applications.
Key Features
- 20 square inch actuator diaphragm for strong, responsive force output
- 8 to 13 PSI spring range for reliable spring-return positioning
- Integrated positive positioner with an adjustable 2 to 13 PSI control span for precise modulating control
- Maximum operating air pressure of 30 PSIG for compatibility with standard pneumatic control systems
- Spring-return design retracts the actuator crank arm on loss of air pressure, providing a fail-safe default position
- Crank arm output for direct linkage to damper blades
Specifications
- Brand: Schneider Electric (Barber Colman)
- Model / SKU: MK4-7121
- Actuator Type: Pneumatic Damper Actuator
- Actuator Size: 20 Square Inch
- Spring Range: 8 to 13 PSI
- Positioner Type: Positive Positioner (Adjustable)
- Control Span: Adjustable 2 to 13 PSI
- Maximum Air Pressure: 30 PSIG
- Fail-Safe Action: Spring retracts crank arm on loss of air pressure
Application
The MK4-7121 is ideal for use in pneumatic building automation and HVAC zoning systems where dependable modulating damper control is required. The adjustable positive positioner allows field technicians to fine-tune the control span to match system requirements, while the spring-return fail-safe action ensures dampers return to a safe default position during air pressure loss — a critical feature for ventilation safety and code compliance.
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