Cleveland Controls DFS-243 Switch

The Cleveland Controls DFS-243 is a mission-critical fixed set point air flow switch designed for HVAC air pressure sensing in duct heaters, ovens, and energy management systems. Engineered as a nonadjustable differential pressure switch, it provides reliable proof-of-flow by operating on a pressure rise at 0.05" ± .02" w.c. This SPDT air flow switch features a snap-acting mechanism housed in a plated metal casing, making it ideal for surface-mounting in compact commercial HVAC maintenance environments where internal access is restricted.

The unit is designed for versatile differential pressure monitoring, capable of sensing positive, negative, or differential air pressure through its dual 1/4" barbed connections. It supports a wide electrical range of 120-277Vac and is compatible with air or combustion by-products that do not degrade its internal silicone diaphragm. For professional contractors, the DFS-243 airflow proving switch ensures precise fan interlock and heater safety without the risk of field-adjustment errors, maintaining system integrity across its 100,000-cycle rated life.

• Reliable Proof-of-Flow: Factory-fixed set point at 0.05" w.c. eliminates the need for field calibration and prevents unauthorized tampering.
• High Compatibility: Rugged silicone diaphragm handles air and combustion by-products up to a maximum pressure of 0.5 psi.
• Flexible Installation: Compact, open-mounted design with universal 1/4" barbed connections for fast integration into existing control loops.
• Industrial Durability: Rated for a wide temperature range of -40°F to 180°F, ensuring performance in demanding mechanical rooms.

Can the DFS-243 be mounted in any orientation?
To maintain the specified 0.05" w.c. operating point, the switch must be mounted with the diaphragm in a vertical plane. Horizontal mounting will shift the set point due to the effect of gravity on the diaphragm.

What is the maximum electrical load for this switch?
The SPDT contacts are rated for 300 VA pilot duty at 115 to 277 VAC, or 15 amps non-inductive at up to 277 VAC, making it suitable for most fan and heater interlock circuits.

Is this switch suitable for sensing filter status?
Yes, by connecting the high and low ports across the filter bank, the DFS-243 can trigger an alert when the differential pressure exceeds the fixed 0.05" w.c. threshold.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.