Cleveland Controls AFS-A-173 Pressure Switch

The Cleveland Controls AFS-A-173 is a high-performance adjustable pressure switch designed for critical airflow proving in package burners, furnaces, and fuel-burning equipment. This SPDT air pressure switch offers a versatile field-adjustable set point range from 0.05" ± 0.02" w.c. to 12" w.c., allowing for precise calibration in positive, negative, or differential pressure applications. Built with a plated housing and a durable silicone diaphragm, it safely handles air and combustion by-products while resisting degradation. The switch supports 120V-277V AC electrical loads and features 1/4" NPT high-pressure and 1/8" NPT low-pressure inlets for robust sampling line connections. For accurate low-point sensing, the unit must be mounted with the diaphragm in a vertical plane. With a 1/2 PSI maximum pressure rating, the AFS-A-173 is the industry standard for reliable HVAC pressure sensing in demanding industrial and commercial environments.

• Field-Adjustable Range: Wide 0.05" to 12.0" w.c. set point provides flexibility for various static pressure requirements.
• Multi-Functional Sensing: Capable of monitoring positive, negative, or differential air pressure with a single device.
• Industrial Durability: Features a rugged plated housing and heavy-duty silicone diaphragm for long-term cycling.
• High Compatibility: Universal SPDT contacts and 120V-277V AC rating ensure integration with most burner control circuits.
• Secure Installation: Includes dual 0.5" conduit connections and threaded NPT sample ports for rigid or flexible tubing.

How do I adjust the set point on the AFS-A-173?
The set point is adjusted by removing the enclosure cover and turning the calibration screw. It is recommended to use a manometer during this process to ensure the switch trips at the specific "w.c. required for your system's safety parameters.

Can this switch be used with combustion exhaust?
Yes, the AFS-A-173 is specifically engineered to handle air or combustion by-products that are compatible with silicone. It is frequently used in flue and vent sensing applications.

Does the mounting orientation matter?
For the switch to meet its lowest specified set point (0.05" w.c.), it must be mounted vertically. Horizontal mounting can shift the calibration due to the weight of the internal diaphragm and linkage.

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.