Cleveland Control AFS-222-121 Switch

The Cleveland Controls AFS-222-121 is a robust differential pressure switch designed for proving airflow in commercial HVAC and energy management systems. Featuring a field-adjustable set point range from 0.05" ± .02" to 12.0" w.c., this air pressure sensing switch allows technicians to precisely calibrate for positive, negative, or differential pressure. Built with a silicone diaphragm and a plated steel housing, it is compatible with air and combustion by-products that do not degrade silicone media. The SPDT contact arrangement supports 120-277Vac electrical loads, making it a versatile HVAC air flow switch for various control and alarm circuits. This unit serves as the direct replacement for JD-2-GREY, CSE-1103, and 8021202056 models. For accurate installation, the unit must be mounted in a vertical plane to maintain the lowest specified operating set point, utilizing the 1/4" OD metallic tubing compression connections for sample lines.

• Wide Adjustable Range: Provides a flexible 0.05" to 12.0" w.c. operating range, accommodating diverse duct static pressure requirements.
• Versatile Compatibility: Seamlessly replaces legacy models including the JD-2-GREY air switch and CSE-1103.
• High Electrical Rating: Features a 15-amp non-inductive rating at 277Vac, suitable for commercial HVAC airflow monitoring.
• Durable Construction: The silicone sensing element and zinc-plated steel enclosure handle temperatures from -40°F to 180°F.
• Simple Integration: Includes an 1/8" FNPT process connection and screw-type terminals with cup washers for secure wiring.

How do I calibrate the set point on the AFS-222-121?
To adjust, turn the calibration screw counterclockwise until it stops, then turn four full rotations clockwise to engage the spring. Each subsequent full turn adjusts the set point by approximately 1.2" w.c. Always use a digital manometer to verify the final setting at operating temperature.

Can this switch be used to sense negative pressure in an exhaust system?
Yes. For negative pressure applications, connect the sample line to the "L" (low) port and leave the "H" (high) port open to the atmosphere. For differential sensing, connect the higher pressure to "H" and lower pressure to "L".

What is the proper mounting orientation for this switch?
The Cleveland Controls AFS-222-121 must be mounted with the diaphragm in a vertical plane. Mounting the unit with the sample line connections facing "up" should be avoided to prevent moisture or debris accumulation from affecting the diaphragm's sensitivity.

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.