Description
Cleveland Controls DFS-221-228 Air Flow Switch Overview
The Cleveland Controls DFS-221-228 is a reliable SPDT (Single-Pole, Double-Throw) air flow switch engineered for precise detection of air movement in HVAC, combustion, and ventilation systems. Designed to operate on pressure rise, this switch activates at a fixed setpoint of .05″ ± .02″ w.c. (water column), making it ideal for proving fan or blower operation before allowing downstream equipment to energize.
Key Features
- SPDT switching action for versatile control circuit integration
- Fixed setpoint: operates on pressure rise at .05″ ± .02″ w.c.
- Wide voltage compatibility: 120–277Vac
- 1/4″ barbed connections for easy tubing attachment
- Maximum pressure rating: 1/2 PSI
- Compatible with air and combustion by-products that will not degrade silicone
- Compact, durable design suited for commercial and light industrial HVAC applications
Specifications
- Model: DFS-221-228
- Switch Type: SPDT (Single-Pole, Double-Throw)
- Operating Principle: Pressure Rise
- Setpoint: .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
- Fan/blower proving in furnaces and air handlers
- Combustion air proving for boilers and burner systems
- Ventilation and exhaust fan verification
- Safety interlock circuits requiring airflow confirmation
Why Choose the Cleveland Controls DFS-221-228?
Cleveland Controls has a long-standing reputation for producing dependable differential pressure and flow switches used throughout the HVAC and combustion industries. The DFS-221-228 delivers consistent, repeatable performance at a low-pressure setpoint, ensuring equipment protection and system safety. Its broad voltage range (120–277Vac) simplifies installation across a variety of electrical configurations, while the 1/4″ barbed connections allow for quick, secure tubing hookup.
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