Cleveland Controls DFS-221-112 Switch

The Cleveland Controls DFS-221-112 Switch is a fixed-setpoint air pressure sensing switch designed for critical airflow proving in duct heaters, ovens, and energy management systems. This SPDT airflow switch is factory-calibrated to actuate on a pressure rise at 0.05" WC (± 0.02" WC), making it an ideal solution for applications requiring a non-adjustable, tamper-proof safety interlock. Built with a durable silicone diaphragm and a zinc-plated steel housing, it reliably senses positive, negative, or differential air pressure in demanding environments. For simplified field installation, the unit features dual barbed fittings that accommodate 1/8" to 1/4" ID flexible tubing and 1/4" male quick-connect spade terminals for rapid electrical termination.

Key Benefits:

• Fixed Setpoint Precision: Factory-set at 0.05" w.c. to ensure consistent system proving without the risk of field-adjustment errors.
• Versatile Sensing: Capable of monitoring positive, negative, or differential pressure, providing flexibility across various HVACR configurations.
• Rugged Construction: Features a high-quality snap-acting SPDT switch rated for 15 Amps, enclosed in a NEMA 1 rated zinc-plated steel housing.
• Ease of Integration: Equipped with barbed sample line connectors and a vertical strap bracket for stable surface mounting in tight spaces.
• High Compatibility: Performance-rated for temperatures ranging from -40°F to 180°F, suitable for diverse mechanical room conditions.

Common Questions:

• Can I adjust the setpoint if my static pressure requirements change? No, the DFS-221-112 is a fixed differential pressure switch specifically designed to prevent unauthorized setpoint tampering. For adjustable versions, consult the AFS series.
• Does the mounting orientation affect performance? Yes. To maintain the 0.05" WC setpoint accuracy, the switch must be mounted with the diaphragm in a vertical plane.
• What size tubing should I use with the barbed fittings? The barbed fitting connectors are designed to securely grip 1/8" through 1/4" ID flexible plastic tubing.

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.