Cleveland Controls RFS-4001-030 Pressure Switch

Professional-grade air pressure sensing is critical for proving fan operation and burner efficiency. The Cleveland Controls RFS-4001-030 is a field-adjustable differential pressure switch designed for HVAC and energy management applications. Built with a rugged plated housing, it effectively monitors positive, negative, or differential air pressure with high accuracy. The unit features an adjustable set point range from 0.15" w.c. ± 0.05" to 5.0" w.c., allowing technicians to fine-tune the engagement and release points for specific system requirements. With a 1/2 PSI maximum pressure rating and electrical compatibility ranging from 120V to 277VAC, this switch is a standard choice for commercial furnace maintenance and industrial automation.

The RFS-4001-030 utilizes a high-quality diaphragm and a snap-acting SPDT switch to ensure reliable contact change on increasing pressure. Designed for longevity, it is rated for up to 100,000 cycles under maximum electrical load. Installers should mount the device with the diaphragm in a vertical plane to maintain factory-specified set points. The enclosure includes five knockouts for 1/2" conduit connections and uses screw terminals with cup washers for secure electrical termination. This proving switch is essential for verifying air flow in rooftop units and ductwork, ensuring safe and efficient equipment operation.

• Field Adjustable Range: Wide adjustment from 0.15" to 5.0" w.c. provides maximum flexibility for differential pressure applications.
• Rugged Reliability: Heavy-duty plated housing and industrial-grade diaphragm designed for 100,000 operational cycles.
• Universal Compatibility: Supports a broad electrical range of 120-277VAC, making it suitable for both industrial pressure switch replacements and new installs.
• Simple Integration: Features 7/16" UNS threads and self-aligning ferrules for 1/4" OD rigid tubing connections.

How do I calibrate the set point?
To adjust the RFS-4001-030, turn the adjustment screw counterclockwise until it stops, then turn clockwise five full rotations to engage the spring. Each subsequent full turn adjusts the set point by approximately 0.61" w.c. Always use a manometer for precise calibration.

What is the proper mounting orientation?
The switch must be mounted with the diaphragm in a vertical plane. Avoid mounting with the sample line connections in the "up" position to prevent moisture accumulation and ensure the air flow switch operates within its specified tolerance.

Can this switch sense negative pressure?
Yes. For negative pressure sensing, connect the sample line to the "L" port while leaving the "H" port open to the atmosphere. For differential pressure sensing, connect the higher pressure to "H" and the lower pressure to "L".

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.