The Cleveland Controls DFS-221-153 is a reliable SPDT air flow switch engineered for precise airflow detection in HVAC, combustion, and ventilation systems. Fixed to operate on a pressure rise, this switch is ideal for proving air movement in furnaces, air handlers, and burner applications where accurate, repeatable switching is critical.
Key Features
- SPDT (Single-Pole, Double-Throw) switching action for versatile control circuit integration
- Fixed setpoint: operates on pressure rise at .05″ ±.02″ w.c. for consistent, reliable airflow proving
- Wide voltage compatibility: rated 120–277Vac for use across a broad range of commercial and residential HVAC systems
- 1/4″ barbed connections for easy, secure tubing attachment
- Maximum pressure rating of 1/2 PSI to protect switch integrity under varying system conditions
- Compatible with air or combustion by-products that will not degrade silicone — suitable for use in combustion air proving and flue gas environments
Specifications
- Model: DFS-221-153
- 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
- Media Compatibility: Air or combustion by-products that will not degrade silicone
Typical Applications
- Furnace and air handler airflow proving
- Combustion air verification in burner systems
- Ventilation and exhaust fan status monitoring
- Safety interlock circuits requiring airflow confirmation
