Cleveland Controls DFS-221-199 Pressure Switch

The Cleveland Controls DFS-221-199 is a professional-grade air pressure sensing switch engineered for high-accuracy airflow proving in duct heaters, ovens, and gas-fired combustion systems. This fixed setpoint pressure switch is factory-calibrated to actuate on a pressure rise of 0.05" WC (± 0.02" WC), providing a reliable safety interlock for HVAC and energy management applications. Its compact, non-adjustable design is particularly effective for surface-mounting in tight mechanical spaces where internal access is restricted.

Built with a durable silicone diaphragm and a rugged zinc-plated steel housing, the DFS-221-199 features SPDT (Single-Pole Double-Throw) snap-acting contacts rated for 15 Amps at 277 VAC. The unit dual-ports for sensing positive, negative, or differential pressure using 0.25" barbed sample line connections compatible with standard flexible tubing. With an automatic reset function and 90-degree quick-connect male terminals, this switch ensures seamless integration into existing control circuits for consistent draft sensing and pressure monitoring.

Key Benefits for Contractors:

• Precision Air Proving: Reliable detection of low-pressure conditions to ensure safe combustion and proper ventilation.
• Versatile Sensing Options: Capable of monitoring positive, negative, or differential air pressure across filters and coils.
• Industrial Durability: Rated for over 100,000 cycles at maximum electrical load with a wide operating temperature range of -40°F to 180°F.
• Simplified Installation: Features 0.25" 90-degree spade terminals and standard foot bracket mounting for fast field replacement.
• Fail-Safe Design: The SPDT configuration allows for both control and alarm functions within a single device.

Common Questions:

Can this switch be used for differential pressure monitoring?
Yes, the DFS-221-199 is equipped with high (H) and low (L) pressure inlets, making it suitable for differential pressure sensing across air-moving components.

Does the mounting orientation affect the setpoint?
To maintain the specified 0.05" WC setpoint, the switch must be mounted with the diaphragm in a vertical plane. Avoid mounting with sample line connections facing upward.

Is this switch compatible with combustion by-products?
The silicone diaphragm is designed to handle air and inert combustion by-products that do not degrade silicone materials.

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.