Description
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
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