The Cleveland Controls DFS-221-227 is a precision-engineered SPDT (Single-Pole, Double-Throw) air flow switch designed to confirm the presence of airflow or combustion by-products in HVAC, burner, and air handling applications. Fixed to operate on a pressure rise of .05″ ± .02″ w.c., this switch provides reliable, repeatable switching performance in demanding environments.
Key Features
- SPDT switching action for versatile circuit control — normally open or normally closed configurations
- Fixed setpoint: operates on pressure rise at .05″ ± .02″ w.c. for accurate, consistent airflow detection
- Wide voltage range: 120–277Vac accommodates a broad range of commercial and industrial control circuits
- 1/4″ barbed connections for easy, secure tubing attachment to pressure taps or sensing lines
- Maximum operating pressure: 1/2 PSI, suitable for low-pressure air and combustion by-product sensing
- Compatible with air and combustion by-products that will not degrade silicone — ideal for furnace, boiler, and burner proving applications
Typical Applications
- Airflow proving in furnaces, air handlers, and rooftop units
- Combustion air verification in boilers and burner systems
- Fan/blower status confirmation in commercial HVAC systems
- Safety interlock circuits requiring airflow confirmation before ignition
Specifications
- Model: DFS-221-227
- Switch Type: SPDT
- Operating Setpoint: .05″ ± .02″ w.c. (pressure rise)
- Voltage Rating: 120–277Vac
- Connection Type: 1/4″ Barbed
- Maximum Pressure: 1/2 PSI
- Compatible Media: Air or combustion by-products that will not degrade silicone
- Brand: Cleveland Controls
