Cleveland Controls AFS-275-112 Switch

The Cleveland Controls AFS-275-112 is a versatile differential air pressure switch designed for critical HVAC air proving and energy management applications. Built to sense positive, negative, or differential air pressure, this SPDT pressure switch features an adjustable set point range from 0.05" WC to 2.0" WC. The plated housing contains a durable silicone diaphragm and a snap-acting switch mechanism, ensuring reliable performance in package burners, furnaces, and fuel-burning equipment. With its 1/4" quick-connect terminals and barbed sample line connections, the AFS-275-112 allows for straightforward integration into existing control circuits. Technical specifications include a maximum pressure rating of 0.5 PSI and an operating temperature range of -40°F to 180°F. For accurate set point maintenance, the unit must be mounted with the diaphragm in a vertical plane. This adjustable air switch is a standard solution for contractors requiring precise pressure monitoring and safety interlocking in industrial and commercial ventilation systems.

• Precise Pressure Monitoring: Field-adjustable set point range of 0.05 to 2.0 inches water column for customized system calibration.
• Versatile Sensing Capabilities: Capable of sensing positive, negative, or differential pressure, making it compatible with a wide array of duct and burner configurations.
• Robust Construction: Features a zinc-plated housing and a high-quality diaphragm designed to withstand temperatures up to 180°F.
• Industry Compliance: UL, CSA, and CE approved for use in professional HVACR and energy management installations.
• Simplified Wiring: Equipped with 90-degree 1/4" male quick-connect spade terminals for efficient SPDT (Single Pole Double Throw) electrical integration.

How do I adjust the set point on the AFS-275-112?
To adjust the set point, turn the adjustment screw counterclockwise until it stops, then turn it four full turns clockwise to engage the spring. Subsequent turns adjust the calibration, with each full turn representing approximately 0.2" WC. Always use a digital manometer to verify the final setting.

What is the proper mounting orientation for this switch?
The switch must be mounted with the diaphragm in a vertical plane. Avoid mounting with the sample line connections pointing "up" to prevent moisture or debris accumulation from affecting the diaphragm's sensitivity.

What type of tubing should be used for the air sampling lines?
The barbed connectors accept standard flexible tubing. For runs up to 10 feet, 1/4" OD tubing is recommended; for runs up to 20 feet, use 1/4" ID tubing to maintain accurate pressure transmission.

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.