Cleveland Controls DFS-221-228 Pressure Switch

The Cleveland Controls DFS-221-228 is a high-reliability, non-adjustable airflow proving switch designed for critical monitoring in duct heaters, ovens, and sophisticated energy management systems. Engineered for technicians who require a "set-and-forget" solution, this SPDT air pressure switch is factory-fixed to operate on a pressure rise of 0.05 ± 0.02" w.c., ensuring precise safety interlocks. Its compact, open-mounted design is specifically optimized for surface-mounting in tight mechanical spaces where internal access is restricted. The unit features a snap-acting switch mechanism and a durable silicone diaphragm, capable of sensing positive, negative, or differential pressure. With a maximum pressure rating of 0.5 psi and an operating range of -40°F to 180°F, the DFS-221-228 provides stable performance across diverse HVAC ventilation environments. Electrical termination is handled via standard 1/4" quick-connect spade terminals, supporting pilot duty ratings up to 277 VAC for seamless integration with existing control circuits.

• Fixed Set Point Accuracy: Pre-calibrated at 0.05" w.c. to eliminate field adjustment errors and reduce installation time during HVAC troubleshooting.
• Versatile Pressure Sensing: Dual sample line connections allow the switch to be used for positive, negative, or differential pressure applications.
• Industrial-Grade Reliability: Rated for a minimum lifespan of 100,000 cycles at maximum electrical load, providing long-term stability for commercial airflow proving.
• Simplified Mounting: Features a zinc-plated strap bracket for secure surface mounting; must be installed in a vertical plane to maintain set point integrity.

How should the DFS-221-228 be mounted for accurate sensing?
To maintain the specified 0.05" w.c. set point, the switch MUST be mounted with the diaphragm in a vertical plane. Avoid mounting with the sample line connections pointing upwards to prevent moisture or debris accumulation in the diaphragm housing.

What type of tubing is compatible with the sample line connectors?
The unit is equipped with 1/4" OD slip-on (barbed) connectors that accept standard flexible tubing. For differential pressure sensing, ensure you connect the high-pressure source to the "H" inlet and the low-pressure/static source to the "L" inlet.

Can this switch be used in high-temperature oven applications?
Yes, the Cleveland Controls DFS-221-228 is rated for operating temperatures up to 180°F (82°C), making it suitable for most duct heaters and industrial oven exhaust monitoring where combustion by-products are present.

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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.