Cleveland Controls DFS-301-112 Switch

The Cleveland Controls DFS-301-112 is a precision-engineered fixed set point airflow switch designed for critical monitoring in duct heaters, ovens, and high-performance HVAC systems. As an airflow proving switch, it utilizes a sensitive silicone diaphragm and a snap-acting SPDT switch to ensure air pressure rises meet specific operational thresholds before permitting equipment engagement. This model is factory-calibrated to operate at a fixed 0.03" w.c. set point (+ 0.02" / -0.0" w.c.), providing reliable protection against low-flow conditions without the need for field adjustment. Its plated housing and compact profile make it an ideal choice for surface-mounting in tight enclosures or areas with limited internal access.

The DFS-301-112 air pressure switch feature dual 1/4" barbed sample line connections that are compatible with standard 1/8" to 1/4" ID flexible tubing. This versatility allows contractors to sense positive, negative, or differential air pressure depending on the installation requirements. Rated for 300 VA pilot duty up to 277 VAC and featuring 1/4" male quick-connect spade terminals, this Cleveland Controls switch integrates seamlessly into existing control circuits while delivering a mechanical life of 100,000 cycles for long-term field stability.

• Factory-Set Performance: Pre-calibrated 0.03" w.c. set point ensures consistent airflow proving without the risk of tampering or incorrect field calibration.
• Universal Sensing: Capable of monitoring positive, negative, or differential pressure, making it a versatile differential air pressure switch for various duct and burner applications.
• Contractor-Friendly Installation: Features standard 1/4" quick-connect terminals and barbed fittings for fast integration and service calls.
• Durable Construction: Built with a specialized silicone diaphragm and plated housing to withstand environments ranging from -40°F to 180°F.

• Can I mount this switch in any orientation? For the DFS-301-112 to maintain its precise set point, it must be mounted with the diaphragm in a vertical plane.
• What does the SPDT contact arrangement mean for my wiring? The Single Pole Double Throw (SPDT) design allows for both normally open and normally closed operations, providing flexibility for safety interlocks or alarm signals.
• Is this switch compatible with combustion air? Yes, it is rated for air or combustion by-products that are non-corrosive to silicone.

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.