Cleveland Controls AFS-275 Switch

The Cleveland Controls AFS-275 is a professional-grade air pressure sensing switch engineered for precision monitoring in HVAC and energy management systems. This SPDT pressure switch features an adjustable set point range from 0.05" WC to 2.0" WC, allowing for granular control over positive, negative, or differential pressure applications. Built with a rugged die-cast aluminum housing and a silicone diaphragm, the AFS-275 ensures long-term reliability in demanding mechanical environments. It is designed to act as a proving switch, verifying airflow across filters, coils, and fans to maintain system integrity. Its versatility makes it the industry standard for differential pressure monitoring and safety interlocking in commercial air handling units. Whether you are replacing a faulty sensor or integrating a new safety loop, the AFS-275 provides the field-adjustable sensitivity required for accurate furnace pressure switch operation and airflow verification.

Key Technical Benefits

• Field-Adjustable Range: Set point flexibility from 0.05" to 2.0" WC via a convenient adjustment screw for precise HVAC pressure switch calibration.
• Versatile Sensing: Capable of monitoring positive, negative, or differential pressure, making it a universal solution for various duct configurations.
• Industrial Durability: Housed in a zinc-plated enclosure to resist corrosion and mechanical stress on the job site.
• Reliable Switching: Features SPDT (Single Pole Double Throw) contacts (Form C) for flexible wiring in both normally open and normally closed circuits.
• Broad Compatibility: Standard 1/4" compression fittings and electrical knockouts ensure quick integration with existing Cleveland Controls AFS Series setups.

Common Installation Questions

How do I plumb the AFS-275 for differential pressure?
Connect the higher pressure source to the "High" inlet (P1) and the lower pressure source to the "Low" inlet (P2). For static pressure only, leave the unused port open to the atmosphere.

Can this switch be mounted in any orientation?
For maximum accuracy and to maintain the factory calibration range, the Cleveland Controls AFS-275 should be mounted with the diaphragm in a vertical plane.

What is the maximum electrical load for this unit?
The SPDT contacts are typically rated for 15 amps at 125-277 VAC, making it suitable for direct control of small motors or as a pilot duty signal for a controller.

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.