Cleveland Controls AFS-228-165 Switch

The Cleveland Controls AFS-228-165 is a high-performance adjustable air differential pressure switch engineered for precise proving switch applications in commercial HVACR environments. Designed to monitor positive, negative, or differential pressure, this air flow switch features a versatile set point range of 0.05" to 12.0" w.c., allowing for granular field adjustments via the calibration spring. The snap-acting SPST contact arrangement is rated for 120-277Vac, ensuring compatibility with standard building automation and energy management systems. Its durable plated housing contains a silicone diaphragm capable of handling air or non-corrosive combustion by-products without degradation. With a maximum pressure rating of 1/2 psi and 1/4" quick-connect spade terminals, the AFS-228-165 provides reliable operation for filter monitoring, fan status indication, and static pressure control. For optimal accuracy, always mount the diaphragm in a vertical plane to maintain the integrity of the lowest specified set point.

• Broad Adjustable Range: Field-adjustable from 0.05" to 12.0" w.c. to accommodate diverse duct velocity and static pressure requirements.
• Standardized Installation: Features 7/16"-24 UNS threaded sample line connectors and an integral foot bracket for secure surface mounting.
• Industrial-Grade Reliability: Rated for a minimum lifespan of 100,000 cycles at maximum electrical load and pressure.
• Multi-Voltage Compatibility: The 120-277Vac electrical rating supports integration into various power supply configurations.

How do I accurately calibrate the AFS-228-165 in the field?
Technicians should use a digital manometer to confirm the exact set point at actual operating temperatures. Adjust the internal calibration spring until the SPST contacts actuate at the desired pressure differential.

What media is this switch compatible with?
The unit is designed for air or combustion gases that do not degrade silicone. It is ideal for monitoring furnace draft, boiler air proving, and cleanroom pressure differentials.

Can this be used to sense negative pressure?
Yes. To sense negative pressure alone, connect the sample line to the low-pressure inlet (L) while leaving the high-pressure inlet (H) open to the atmosphere.

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.