Cleveland Controls DFSH-CO Switch

The Cleveland Controls DFSH-CO is a heavy-duty, field-proven fixed point air pressure sensing switch specifically designed for high-demand HVACR environments, including duct heaters, industrial ovens, and energy management systems. This differential pressure switch comes with a protective enclosure box and is factory-calibrated to actuate at a fixed set point of 0.4" W.C. (+/- 0.08"), eliminating the risk of field tampering or drift. As a direct replacement for the DFSH-CO-1 and DFSH-CO-3, this unit features a snap-acting SPDT (Single Pole Double Throw) switch configuration, allowing for versatile wiring in either normally open or normally closed circuits to prove airflow or monitor filter status.

Built for horizontal or vertical surface mounting, the Cleveland Controls DFSH-CO utilizes a high-quality silicone diaphragm and a plated housing to withstand temperatures from -40°F to 180°F. Technical sampling is handled via two distinct ports: a 1/4"-18 NPT female high-pressure inlet and a 1/8"-27 NPT female low-pressure inlet. For secure electrical integration, the unit features screw terminals with cup washers, rated for up to 15 Amps non-inductive at 277 VAC, ensuring reliable HVAC airflow proving even in industrial-grade applications.

• Universal Compatibility: Identical performance and footprint to DFSH-CO-1 and DFSH-CO-3 for streamlined inventory and rapid field replacement.
• Multi-Port Versatility: Capable of sensing positive, negative, or differential air pressure across various duct configurations.
• Robust Construction: Housed within a protective box to safeguard sensitive SPDT switch components from debris and mechanical damage.
• Precise 0.4" W.C. Calibration: Pre-set for airflow monitoring and safety interlock applications where 0.4 inches water column is a critical threshold.

Can this switch be used to monitor a dirty filter?
Yes. By connecting the high-pressure port upstream and the low-pressure port downstream of the filter, the Cleveland Controls DFSH-CO will actuate once the differential reaches 0.4" W.C., signaling a restriction.

Does the mounting orientation affect the 0.4" W.C. set point?
For maximum accuracy, the switch should be mounted with the diaphragm in a vertical plane. Mounting with the sample line connections facing upward is not recommended as it may affect the specified set point.

Is this model suitable for high-voltage control circuits?
The DFSH-CO is rated for 300 VA pilot duty at 115 to 277 VAC and up to 15 Amps non-inductive, making it compatible with most commercial HVAC pressure switch control loops.

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.