Cleveland Controls AFS-298-112-148 Switch

The Cleveland Controls AFS-298-112-148 is a high-performance air pressure sensing switch engineered for precise monitoring in HVAC systems and combustion processes. This differential pressure switch features an adjustable set point range from 0.05" w.c. to 12.0" w.c., with factory-calibrated contacts set to change on increasing pressure at 0.45" ± 0.05" w.c. Designed for residential, commercial, and industrial applications, the unit utilizes a silicone diaphragm capable of handling air and common combustion byproducts without degradation. The SPDT contacts support a versatile electrical rating from 120V to 277V AC, making it a reliable choice for furnace draft inducer monitoring and blower proving circuits. With a maximum pressure rating of 1/2 PSI, it ensures accurate static pressure detection in high-demand environments. Contractors favor this model for its NEMA 1 enclosure compatibility and field-proven reliability in proving airflow before ignition sequences begin.

Key Benefits for Technicians

• Wide Adjustability: Operating range of 0.05" to 12.0" w.c. allows for precise field tuning across various HVAC pressure switch applications.
• Broad Voltage Compatibility: Rated for 120V, 240V, and 277V AC circuits, simplifying inventory by replacing multiple single-voltage parts.
• Durable Construction: Features a rugged zinc-plated steel housing and industrial-grade silicone for long-term resistance to environmental stressors.
• Flexible Mounting: Equipped with 1/4" compression fittings for high and low-pressure ports, facilitating quick integration into existing combustion air systems.

Common Questions

What is the purpose of the 0.45" w.c. factory setting on this switch?
The .45" w.c. set point indicates when the DPST or SPDT contacts will actuate on a rise in pressure, serving as a critical safety proof for inducer motors or ventilation fans.

Can this switch be used with flue gas or exhaust?
Yes, the Cleveland Controls AFS-298-112-148 is specifically designed to handle air or combustion byproducts, provided those gases do not chemically degrade the internal silicone diaphragm.

How do I adjust the physical set point in the field?
Technicians can adjust the set point by removing the top cover and turning the internal adjustment screw; however, for critical safety applications, a calibrated manometer should always be used to verify the new trip point.

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.