The Cleveland Controls AFS-951 is a high-performance differential pressure sensing switch engineered for precise monitoring of air and non-combustible gases. This SPDT air pressure switch features a versatile field-adjustable set point range of 0.05" to 12.0" w.c., making it an essential component for proving airflow in commercial burners, furnaces, and complex HVAC systems. Built with a durable plated housing and a sensitive silicone diaphragm, the AFS-951 ensures reliable HVAC air pressure monitoring by detecting positive, negative, or differential pressure. Its snap-acting SPDT switch configuration allows for seamless integration into safety circuits, commonly serving as a low-draft cutoff or a filter-dirty indicator. For optimal performance at the lowest set points, technicians should mount the unit with the diaphragm in a vertical plane. The high-reliability design is rated for over 100,000 cycles at maximum electrical load, providing consistent performance in demanding industrial environments. Key Benefits Precise Pressure Control: Offers a wide field-adjustable range from 0.05" to 12.0" w.c. to suit diverse combustion air flow switch requirements. Versatile Compatibility: Supports positive, negative, and differential pressure sensing for furnaces, blowers, and fume hood operations. Rugged Construction: Features a durable housing and silicone diaphragm designed to handle air and combustion by-products comfortably. Standardized Installation: Equipped with dual 1/4" - 18 NPT female connectors and a 7/8" conduit opening for easy 1/2" conduit fitting. Reliable Switching: Includes SPDT contacts for flexible wiring in both control and alarm circuits. Common Questions How do I adjust the set point on the AFS-951? To adjust the operating set point, remove the protective plug button on the enclosure side. Use a standard blade screwdriver to turn the adjusting screw. It is best practice to use a digital manometer to verify the exact set point during installation. What is the maximum pressure rating for this switch? The AFS-951 is rated for a maximum pressure of 0.5 PSI (13.85" w.c.). Exceeding this limit can damage the internal diaphragm or affect calibration accuracy. Can this switch be used to monitor filter status? Yes, by measuring the differential pressure across a filter bank, the AFS-951 can trigger an alarm or signal the building management system when dirt accumulation causes an excessive pressure drop. 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.
