Cleveland Controls AFS-438 Switch

The Cleveland Controls AFS-438 is a professional-grade SPDT air pressure sensing switch designed for critical monitoring in HVAC, energy management, and light industrial applications. This adjustable pressure switch features a versatile set point range of 0.05" w.c. to 2.0" w.c., allowing for precise field calibration to verify positive, negative, or differential air pressure. Engineered with a durable plated housing and a silicone-compatible diaphragm, the AFS-438 is rated for 120V to 277Vac operations and can handle a maximum pressure of 1/2 PSI. This unit is built to sense air or combustion by-products effectively without material degradation, ensuring reliable contact closure on increasing pressure. For contractors, the AFS-438 switch provides a robust solution for proving fan operation or monitoring filter status in diverse pneumatic systems.

• Precise Pressure Control: Fine-tune your system with an adjustable range from 0.05" to 2.0" w.c. to meet specific static pressure requirements.
• Broad Voltage Compatibility: Operates efficiently across 120V, 240V, and 277Vac electrical configurations for maximum job site flexibility.
• Durable Construction: Features a rugged plated housing designed to withstand the rigors of mechanical rooms and industrial environments.
• Versatile Media Handling: Specifically engineered for air and combustion by-products that are compatible with silicone components.
• High Cycle Reliability: Mechanical life rated for over 100,000 cycles at maximum electrical load and rated pressure.

How do I adjust the set point on the AFS-438?
The set point is field-adjustable via the calibration screw. For the most accurate results, use a manometer to verify the exact "inches of water column" at which the contacts change state.

In what position should I mount this air pressure switch?
To achieve the lowest specified set point of 0.05" w.c., the diaphragm must be positioned in a vertical plane. Mounting in other orientations may shift the calibration point due to the weight of the internal components.

What is the maximum pressure this unit can withstand?
The Cleveland Controls AFS-438 is rated for a maximum pressure of 0.5 PSI (13.8" w.c.). Exceeding this limit can damage the internal diaphragm and affect switching accuracy.

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.