Cleveland Controls AFS-460-121 Switch

The Cleveland Controls AFS-460-121 is a professional-grade adjustable air pressure sensing switch engineered for high-accuracy performance in HVAC and energy management systems. Designed to monitor positive, negative, or differential air pressure, this proving switch features a versatile setpoint range of 0.4" w.c. to 12.0" w.c., making it a reliable solution for verifying fan operation or filter status. As a safety-critical component, it utilizes a manual reset mechanism that prevents automatic system restarts, requiring a technician's inspection following a trip. The rugged, zinc-plated housing houses a silicone diaphragm and a snap-acting SPST-NC switch, ensuring consistent actuation across an operating temperature range of -40°F to 180°F. The AFS-460-121 kit includes essential compression fittings for 1/4" OD tubing, facilitating a secure field adjustment process when paired with a digital manometer for precise calibration.

Key Benefits

• Broad Pressure Range: Field-adjustable from 0.4" to 12" w.c. to accommodate a wide variety of static pressure and airflow requirements.
• Mechanical Safety: Integrated manual reset button ensures equipment is inspected before resuming operation, preventing repetitive short cycling.
• Flexible Sensing: Supports five different application modes, including positive, negative, and differential pressure sensing.
• Industrial Durability: Features a high-quality plated housing and 1/2" conduit connection for reliable protection in rigorous commercial environments.
• Complete Hardware: Shipped as a full pressure switch kit with the necessary hardware for immediate surface mounting and sample line attachment.

Common Questions

How do you calibrate the setpoint on the AFS-460-121?
To adjust the switch actuation point, remove the enclosure cover and turn the adjusting screw. It is best practice to use a manometer to confirm the exact inches of water column at which the contacts open or close.

Why is my air pressure switch stuck and necessitating a manual reset?
A trip usually indicates an airflow obstruction, a failed inducer motor, or a clogged vent pipe. The manual reset feature is a safety lockout designed to protect the system from operating under hazardous conditions.

What is the proper mounting orientation for this switch?
In order to maintain the lowest specified 0.4" w.c. setpoint, the switch must be mounted vertically with the diaphragm in a vertical plane. Avoid mounting with the sample line connections facing upward to prevent condensation buildup.

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.