Cleveland Control AFS-222-379C Air Flow Switch

The Cleveland Control AFS-222-379C Air Flow Switch is a professional-grade differential pressure switch engineered for critical air proving and energy management applications. Designed to monitor positive, negative, or differential pressure, this unit features a wide field-adjustable set point range of 0.05" ± .02" to 12.0" w.c. Built for reliability in demanding environments, the switch utilizes a high-integrity silicone diaphragm capable of handling air and combustion by-products that are non-corrosive to silicone. With an electrical rating of 15 Amps non-inductive at 277 VAC and a SPDT contact arrangement, it provides versatile control for fans, blowers, and damper proving circuits. The low pressure air switch housing is zinc-plated to withstand industrial conditions and includes a 1/2 psi maximum pressure rating. For precise integration, the unit features 1/4" OD compression sample line connectors and screw-type terminals with cup washers for secure electrical terminations.

• Precise Pressure Monitoring: Field-adjustable range from 0.05" to 12.0" w.c. allows for fine-tuning in nearly any HVAC system.
• Versatile Application: Proves airflow by sensing positive, negative, or differential air pressure across filters, coils, and fans.
• Robust Electrical Specs: High-capacity SPDT contacts rated up to 277 VAC support a wide variety of commercial and industrial voltages.
• Durable Construction: Zinc-plated steel housing and a silicone diaphragm ensure long-term performance even when exposed to combustion by-products.
• Flexible Mounting: Designed to be mounted in any vertical plane to maintain accurate operation and lowest specified set points.

How do I calibrate the set point?
The set point is adjusted via a calibration screw located under the enclosure cover. Turn the screw counterclockwise until it stops, then clockwise four full turns to engage the spring. Each subsequent full turn adjusts the setting by approximately 1.2" w.c. Use a digital manometer for final verification.

What tubing is compatible with this switch?
The AFS-222-379C is designed for 1/4" OD firm-wall tubing using the included compression ferrules and nuts. For runs over 20 feet, shifting to 1/4" ID or 1/2" ID tubing is recommended to maintain signal accuracy.

Can this be used for combustion air proving?
Yes, as long as the combustion by-products do not degrade silicone, this switch is suitable for flue gas and combustion air applications.

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.