Cleveland Controls DFS-221-347 Air Flow Switch, SPDT, 120-277Vac

The Cleveland Controls DFS-221-347 is a reliable, fixed-setpoint air flow switch engineered for HVAC and combustion applications where accurate airflow detection is critical. Designed to operate on a pressure rise, this SPDT (Single-Pole, Double-Throw) switch activates at a precise differential pressure of .05″ ± .02″ w.c., making it ideal for proving airflow in furnaces, air handlers, and combustion equipment.

Built for broad voltage compatibility, the DFS-221-347 accepts 120–277Vac power, simplifying integration into a wide range of commercial and residential control systems. Its 1/4″ barbed connections allow for quick, tool-free tubing attachment, and the unit is rated for a maximum inlet pressure of 1/2 PSI. The wetted materials are compatible with air and combustion by-products that will not degrade silicone, ensuring long-term durability in demanding environments.

Key Features

• SPDT switching action for versatile control circuit integration
• Fixed setpoint: operates on pressure rise at .05″ ± .02″ w.c.
• Wide voltage range: 120–277Vac
• 1/4″ barbed port connections for easy tubing attachment
• Maximum inlet pressure: 1/2 PSI (0.5 PSI)
• Compatible with air and combustion by-products that will not degrade silicone

Specifications

• Brand: Cleveland Controls
• SKU: DFS-221-347
• Switch Type: SPDT (Single-Pole, Double-Throw)
• Operating Principle: Fixed setpoint, pressure rise
• Actuation Pressure: .05″ ± .02″ w.c.
• Voltage Rating: 120–277Vac
• Connection Type: 1/4″ Barbed
• Maximum Pressure: 1/2 PSI
• Media Compatibility: Air or combustion by-products that will not degrade silicone

Applications

• Airflow proving in residential and commercial furnaces
• Air handler and blower operation verification
• Combustion equipment safety interlocks
• HVAC control systems requiring differential pressure sensing