Cleveland Controls AFS-145 Switch

The Cleveland Controls AFS-145 Air Pressure Sensing Switch is an industry-standard, general-purpose proving switch designed for combustion air pressure monitoring in package burners, furnaces, and high-demand HVAC systems. This adjustable differential pressure switch features a wide setpoint range from 0.05" to 12.0" w.c., allowing for precise field calibration to match specific fan curves or duct static pressures. Built with a rugged zinc-plated steel enclosure and a durable silicone diaphragm, the AFS-245 handles air and combustion by-products without material degradation in temperatures ranging from -40°F to 180°F.

For versatile system integration, the SPDT contact arrangement supports normally open or normally closed logic, with a robust electrical rating of 15A for 277 VAC airflow proving circuits. The dual 1/8" NPT sample line connectors facilitate the monitoring of positive, negative, or differential pressure. To ensure accurate low-end switching, technicians must mount the unit with the diaphragm in a vertical plane. The progressive switching differential, ranging from 0.02" to 0.8" w.c., provides the necessary sensitivity for building automation systems and energy management applications.

• Wide Adjustment Range: Field-adjustable from 0.05" to 12" w.c., reducing the need to stock multiple fixed-range airflow switches.
• Multi-Input Compatibility: Dual ports allow for differential pressure sensing across blowers, filters, or heat exchangers.
• High Electrical Capacity: 15A snap-acting switch handles high-voltage control circuits (up to 277 VAC) without external relays.
• Industrial Durability: NEMA 1 rated housing with high-grade silicone ensures longevity in boiler and burner applications.
• Flexible Mounting: Integral bracket with 3/16" holes supports standard surface mounting in any vertical orientation.

• Can this switch be used for safety proofing on gas burners? Yes, the AFS-145 is frequently used as a combustion air proving switch to ensure blower operation before the gas valve is energized.
• What is the best way to calibrate the setpoint? Use a digital manometer. Turning the adjustment screw clockwise increases the setpoint; each full turn adds approximately 1.2" w.c. after the spring is engaged.
• Does orientation matter during installation? Critical: To reach the lowest 0.05" w.c. setpoint, the switch must be mounted vertically. Horizontal mounting will shift the calibration point due to the weight of the diaphragm.

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.