AFS-460 Johnson Controls Air Flow Switch

Overview

The Johnson Controls AFS-460 is a general-purpose, airflow-proving differential pressure switch designed for HVAC and energy management applications. It features a manual operator reset that requires intervention following actuation, making it suitable for systems requiring an operator interface. It can sense positive, negative, or differential air pressure.

Features

• Manual reset button to close the switch after actuation.
• Adjustable setpoint range.
• Plated housing containing a diaphragm and calibration spring.
• Snap-acting SPST-NC switch configuration.
• Enclosure cover protects against accidental contact with live switch terminal screws and the setpoint adjusting screw.

Specifications

• Adjustable Range: 0.4 to 12.0 inches water column (w.c.)
• Maximum Pressure: 0.5 psi (0.03 bar)
• Contact Arrangement: SPST Normally Closed (NC)
• Electrical Rating: 15 A at 125, 250, or 277 VAC; 1/4 hp at 125 VAC
• Sample Line Connections: Integral compression ferrule and nut accepting 0.25-inch OD rigid tubing
• Conduit Connection: Accepts 0.5-inch conduit connection (7/8-inch opening)
• Mounting Orientation: Diaphragm must be mounted in a vertical plane

Applications

• Proving fan status and airflow presence.
• Monitoring filters for excess pressure drop.
• Monitoring duct static pressure.
• Managing damper status within HVAC systems.