Cleveland Controls DFS-221-227 Switch

The Cleveland Controls DFS-221-227 is a precision-engineered airflow proving switch specifically designed for duct heaters, ovens, and energy management systems. This fixed set point air pressure switch is factory-calibrated to operate on a pressure rise at 0.05" ± 0.02" w.c., making it a reliable solution for applications where a non-adjustable, tamper-proof sensing component is required. Built with a durable plated housing and a high-performance silicone diaphragm, the DFS-221-227 is optimized for sensing air or combustion byproducts without material degradation. Designed for versatility in the field, this SPDT air pressure switch features 1/4" barbed connections that interface seamlessly with flexible tubing. The dual-voltage electrical rating of 120-277Vac ensures compatibility across various commercial HVACR control circuits. For maximum reliability, the snap-acting switch is rated for 15 amps non-inductive and can withstand a maximum pressure of 1/2 PSI. Technicians should note that for optimal accuracy, this unit must be surface-mounted with the diaphragm in a vertical plane to maintain the specified operating set points while avoiding vibration-heavy locations.

• Fixed Set Point Accuracy: Precision calibration at 0.05" w.c. eliminates the need for field adjustments and prevents unauthorized set point tampering.
• Broad Electrical Compatibility: The 120-277Vac SPDT configuration supports diverse sensing, alarm, and control functions within a single unit.
• Enhanced Durability: Mechanical life exceeding 100,000 cycles ensure longevity in demanding HVAC energy management environments.
• Flexible Mounting: The 1/4" barbed connections and zinc-plated strap bracket allow for quick installation in areas with limited internal access.

Can the DFS-221-227 sense differential pressure?
Yes, by utilizing both the high-pressure and low-pressure inlets, this switch can monitor differential pressure. For positive-only or negative-only sensing, one port should remain open to the atmosphere.

What is the maximum operating temperature for this switch?
The Cleveland Controls DFS-221-227 is designed to operate reliably in ambient temperatures ranging from -40°F to 180°F (-40°C to 82°C).

How should the switch be oriented during installation?
To ensure the differential pressure switch activates at the exact factory set point, it must be mounted with the diaphragm in the vertical plane. Mounting the unit with the sample line connections facing up should be avoided to prevent moisture accumulation.

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.