Description
The Cleveland Controls AFS-256-342 is a reliable, heavy-duty air flow switch engineered for HVAC and combustion applications where accurate airflow detection and system protection are critical. Designed to handle a wide operating voltage range and built to withstand air or combustion by-products, this switch is a trusted solution for commercial and industrial installations.
Product Overview
The AFS-256-342 monitors airflow within ductwork and air-handling systems, triggering a normally open contact upon detection of sufficient air movement. Its broad setpoint range and robust construction make it suitable for a variety of forced-air and combustion equipment applications.
Key Specifications
- Setpoint Range: .10″ ± .02″ to 2.0″ w.c. (water column)
- Operating Voltage: 120–480Vac
- Contact Arrangement: Normally Open (N.O.)
- Maximum Pressure Rating: 1/2 PSI
- Compatible Media: Air or combustion by-products that will not degrade silicone
- Brand: Cleveland Controls
- SKU: AFS-256-342
Features & Benefits
- Wide voltage compatibility (120–480Vac) suits a broad range of commercial and industrial equipment
- Normally open contact arrangement provides fail-safe operation — circuit opens on loss of airflow
- Adjustable setpoint range from .10″ to 2.0″ w.c. allows precise calibration to system requirements
- Silicone-compatible wetted materials ensure durability in combustion by-product environments
- 1/2 PSI maximum pressure rating supports standard duct and air-handling system pressures
- Compact, field-proven design for straightforward installation and long service life
Typical Applications
- Air handling units (AHUs) and fan coil units
- Furnaces and combustion air proving
- Duct airflow proving and interlock circuits
- Commercial HVAC systems requiring airflow verification
- Ventilation and exhaust fan status monitoring







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