Cleveland Controls DFS-423 Switch

The Cleveland Controls DFS-423 is a high-performance fixed setpoint air pressure switch designed for HVAC proof of flow and combustion air monitoring. Engineered to actuate on a pressure rise at 0.05" W.C., this SPDT air flow switch provides reliable signaling for industrial and commercial furnace applications. The unit features built-in 1/4" barbed connections for simplified tubing installation and is rated for a maximum internal pressure of 1/2 PSI. Constructed with a robust diaphragm compatible with air and non-corrosive combustion byproducts, the DFS-423 ensures steady performance across 120-277Vac circuits. For contractors managing draft inducer proving or positive pressure sensing, this switch offers a factory-calibrated solution that eliminates field adjustment errors, maintaining critical safety interlocks in demanding thermal environments.

Key Technical Benefits

• Fixed Setpoint Reliability: Factory-set at 0.05" w.c. to ensure precise pressure rise detection without the risk of drifting.
• Broad Voltage Compatibility: Supports electrical loads from 120Vac to 277Vac, making it suitable for diverse commercial HVAC maintenance.
• Durable Diaphragm: Engineered for silicone-safe combustion air and air-handling applications to prevent premature component fatigue.
• Streamlined Integration: Features 1/4" barbed ports and a compact footprint for fast differential pressure switch replacement in tight cabinets.

Common Questions

Can the DFS-423 be adjusted in the field?
No, the DFS-423 is a fixed setpoint switch calibrated at 0.05" W.C. for applications requiring consistent, tamper-proof performance.

What media is compatible with this sensor?
It is designed for use with air and combustion by-products that do not degrade silicone, ideal for furnace draft proving.

How do I handle the 1/4" barbed connections?
Ensure you use flexible polymeric tubing to prevent air leaks and maintain accurate HVAC pressure sensing levels.

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.