Description
The Cleveland Controls AFS-228-121 is a reliable, wide-range air flow switch engineered for demanding HVAC and combustion applications. Designed to detect the presence or absence of airflow, this switch is ideal for use in air handling units, furnaces, boilers, and ventilation systems where accurate flow verification is critical to safe and efficient operation.
Key Features
- Wide differential pressure sensing range of .05″ to 12.0″ w.c. (water column) for versatile application coverage
- Broad voltage compatibility: 120–277Vac for easy integration into a variety of electrical systems
- SPDT (Single Pole Double Throw) contact arrangement provides both normally open and normally closed switching options
- Maximum operating pressure of 1/2 PSI for safe use in standard HVAC ductwork and combustion air systems
- Compatible with air or combustion by-products that will not degrade silicone, ensuring long-term durability in combustion environments
Specifications
- Brand: Cleveland Controls
- Model / SKU: AFS-228-121
- Sensing Range: .05″ – 12.0″ w.c.
- Voltage Rating: 120–277Vac
- Contact Arrangement: SPDT (Single Pole Double Throw)
- Maximum Pressure: 1/2 PSI
- Media Compatibility: Air or combustion by-products that will not degrade silicone
Typical Applications
- Air handling units (AHUs) and fan coil units
- Furnaces and boilers requiring combustion air proving
- Ventilation and exhaust systems
- Industrial and commercial HVAC ductwork
- Combustion safety interlock circuits
The AFS-228-121’s wide pressure range and dual-voltage compatibility make it a go-to solution for HVAC technicians and engineers who need a dependable airflow proving switch across a broad spectrum of installations. Its silicone-safe media compatibility ensures reliable performance even in combustion by-product environments.
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