The Cleveland Controls AFS-A is a versatile, field-adjustable air pressure switch engineered for precision airflow proving in furnaces, package burners, and other fuel-burning equipment. As a technician-grade differential air pressure switch, the AFS-A features a high-sensitivity silicone diaphragm capable of sensing positive, negative, or differential pressure within a set point range of 0.05" to 12.0" w.c.. The unit is housed in a plated metal enclosure with a 1/2" conduit connection to protect the internal SPDT snap-acting switch and terminal screws from environmental interference. Installation flexibility is a core advantage; the AFS-A air pressure sensing switch includes a 1/4" NPT female high-pressure inlet and a 1/8" NPT female low-pressure inlet, allowing for rigid pipe or compression fitting integration. To ensure peak accuracy at the lowest set points, the switch must be mounted with the diaphragm in a vertical plane. The rugged construction is rated for 100,000 cycles at 0.5 psi, making it a reliable choice for HVAC pressure switch replacement in commercial and industrial combustion air systems. Key Benefits Universal Compatibility: Senses positive, negative, or differential pressure for versatile application across manifold systems and ductwork. Wide Adjustment Range: Field-adjustable from 0.05" ± 0.02" to 12.0" w.c. allows for precise calibration to specific equipment requirements. Contractor-Ready Housing: Rugged plated housing with a removable cover protects electrical terminals and the adjustable set point screw. High Electrical Rating: Features a 15-amp non-inductive SPDT switch rated for 115 to 277 VAC, suitable for various control circuits. Extreme Temperature Resilience: Operates reliably in environments ranging from -40°F to 180°F (-40°C to 82°C). Common Questions How do I calibrate the set point on a Cleveland Controls AFS-A? To adjust the AFS-A set point, turn the adjustment screw counterclockwise until it stops, then turn it clockwise four full turns to engage the calibration spring. Each subsequent full clockwise turn increases the set point by approximately 1.2" w.c. Always use a digital manometer to verify the exact trip point during commissioning. What is the proper mounting orientation for this switch? For accurate operation at the minimum 0.05" w.c. threshold, the Cleveland Controls AFS-A must be mounted vertically. Avoid mounting with the sample line connections pointing upward to prevent moisture or debris from entering the diaphragm chamber. Can the AFS-A be used for both positive and negative pressure applications? Yes. For positive pressure, connect the sample line to the "H" (1/4") port. For negative pressure, connect to the "L" (1/8") port. For differential pressure sensing, connect the higher pressure to "H" and the lower pressure to "L". This item is not eligible for free shipping. 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.
