Cleveland Controls FS-751-337 Switch

The Cleveland Controls FS-751-337 is a precision-engineered fixed point air pressure sensing switch designed for high-reliability airflow monitoring in duct heaters, ovens, and commercial HVAC systems. This model features a non-adjustable factory setpoint of 0.05" WC, making it a critical component for applications requiring strict adherence to low-pressure activation thresholds. As a direct replacement for FS-751-185, it allows for a seamless drop-in installation without the need for additional field calibration. The SPDT (Single Pole Double Throw) configuration provides versatile signaling for both control and alarm circuits, while the integrated delay timer prevents nuisance tripping caused by momentary pressure fluctuations or system turbulence. Built with a robust plated housing and a silicone-compatible diaphragm, this differential pressure switch maintains operational stability in demanding environments. For contractors managing airflow proving tasks, the FS-751-337 ensures efficient performance by accurately sensing positive, negative, or differential air pressure.

• Optimized System Stability: The integrated delay timer effectively eliminates rapid cycling, reducing wear on downstream components.
• High-Precision Sensing: Actuates reliably at 0.05" WC (±0.02" WC) to ensure safety in low-airflow conditions.
• Durable Construction: Features a rugged plated housing designed for surface-mounting in restricted spaces.
• Broad Compatibility: Functions as a high-performance direct replacement for FS-751-185, maintaining OEM specifications.
• Versatile Application: Capable of sensing positive, negative, or differential air pressure in various HVAC configurations.

• How do I install the FS-751-337 for proper setpoint accuracy? To maintain the specified 0.05" WC setpoint, the switch MUST be mounted with the diaphragm in a vertical plane. Avoid mounting with the sample line connections facing upward.
• Which sample line connectors does this switch use? This model typically uses compression ferrule and nut connections suitable for 1/4" OD firm wall tubing, ensuring a leak-proof seal for precise pressure measurement.
• Is this switch compatible with combustion byproducts? Yes, the internal diaphragm is compatible with air and most combustion byproducts that do not degrade silicone, making it suitable for duct heater and oven applications.

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.