The Cleveland Controls DFS-243 is a fixed-setpoint SPDT air flow switch engineered for reliable airflow detection in HVAC, combustion, and ventilation systems. Designed to operate on pressure rise, this switch provides a dependable switching signal when airflow is confirmed — making it an essential safety and control component in a wide range of heating and air handling applications.
How It Works
The DFS-243 monitors differential air pressure and activates its SPDT output when pressure rises to the factory-fixed setpoint of .05″ w.c. (±.02″ w.c.). This pressure-rise operation ensures the switch confirms positive airflow before allowing downstream equipment to energize, supporting safe and efficient system operation.
Key Features
- SPDT (Single-Pole, Double-Throw) switching action for versatile control wiring
- Fixed setpoint: operates on pressure rise at .05″ ± .02″ w.c.
- Wide voltage compatibility: 120–277Vac
- 1/4″ barbed pressure connections for easy tubing attachment
- Maximum operating pressure: 1/2 PSI
- Compatible with air and combustion by-products that will not degrade silicone
Specifications
- Model: DFS-243
- Switch Type: SPDT
- Operating Principle: Fixed, pressure rise
- Setpoint: .05″ w.c. ± .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
Typical Applications
- Furnace and air handler airflow proving
- Combustion air proving in heating equipment
- Ventilation system airflow confirmation
- Fan proving and interlock control circuits
