Cleveland Controls AFS-442 Sensing Switch

The Cleveland Controls AFS-442 is a professional-grade air pressure sensing switch designed for critical monitoring in HVAC and energy management systems. Engineered for precision, this differential pressure switch features SPDT contacts and an adjustable set point range from 0.05" w.c. to 2.0" w.c., making it the industry standard for proving airflow in package burners and furnaces. The AFS-442 is technically identical to the AFS-442-3, ensuring a direct drop-in replacement for existing installations. Its plated housing protects a highly sensitive silicone diaphragm and a snap-acting switch capable of handling 300 VA pilot duty at 115 to 277 VAC. For proper operation, technicians must mount the unit with the diaphragm in a vertical plane to maintain the specified operating set point. With two 1/8" NPT female connectors and a 1/2" conduit opening, this differential air switch provides reliable positive, negative, or differential air pressure sensing across a wide temperature range of -40 to 180 degrees Fahrenheit.

• Versatile Compatibility: Identical to the AFS-442-3, ensuring seamless integration into diverse HVACR equipment and fuel-burning systems.
• Precise Field Calibration: The adjustable set point allows for fine-tuning between 0.05" and 2.0" w.c. to meet specific equipment safety requirements.
• Heavy-Duty Construction: Features a rugged snap-acting SPDT switch and a plated housing for long-term reliability in demanding mechanical rooms.
• Industrial Ratings: UL, FM, and CSA approved, with a 15 amp noninductive rating, providing a high level of security for critical proving circuits.
• Flexible Connectivity: Dual 1/8" NPT sample line connectors accommodate standard 1/4" OD rigid or semi-rigid tubing for easy manifolding.

Is the AFS-442 compatible with the AFS-442-3?
Yes, these two models are functionally and technically identical and can be used interchangeably in all applications.

What media can this switch measure?
The unit is designed to sense air or combustion by-products that will not degrade the silicone diaphragm, making it ideal for exhaust and supply air monitoring.

Does the mounting orientation affect performance?
For accurate low-end set point detection, the switch must be mounted with the diaphragm in a vertical plane. Avoid mounting with sample line connections facing upward to prevent moisture accumulation.

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.