Cleveland Controls DFS-448-153 Switch

The Cleveland Controls DFS-448-153 is a purpose-built air flow switch designed for critical monitoring in industrial HVAC systems, air handling units, and duct heaters. This fixed set point air pressure switch is factory-calibrated to actuate on a pressure rise of 0.05" ± 0.02" w.c., providing high-accuracy sensing for equipment safety and cycle control. Featuring a SPDT switch configuration (Single Pole Double Throw), it facilitates versatile wiring for both proving and interlocking circuits, accommodating electrical loads from 120V to 277Vac. The unit is optimized for HVAC pressure sensing in environments containing air or combustion by-products that are non-corrosive to its silicone diaphragm. With 1/4" barbed connections for easy tubing installation and a maximum pressure rating of 0.5 psi, this open-mounted component is a reliable standard for technicians requiring a robust, non-adjustable solution for energy management and fan proving applications.

• Fixed Set Point Accuracy: Operates at a precise .05" w.c. rise, eliminating the risk of field tampering or calibration drift in air pressure sensing.
• High-Voltage Compatibility: The 120-277Vac rating allows for seamless integration into diverse commercial and industrial control circuits.
• Broad Application Range: Ideal for duct heater control, oven monitoring, and general ventilation safety systems.
• Durable Construction: Features silicone-compatible materials to withstand standard combustion by-products without degrading performance.

What is the maximum pressure this switch can handle?
The Cleveland Controls DFS-448-153 is rated for a 1/2 psi maximum pressure, making it suitable for low-pressure air proving but not high-pressure applications.

Can this switch be used to sense negative pressure?
While the DFS-448-153 is typically used for positive pressure rise, its SPDT configuration and dual barbed connections allow for flexible plumbing in differential or pressure-rise setups.

Does this switch require field adjustment?
No, this model is a fixed set point switch, factory-set at 0.05" w.c. to ensure consistent operation without the need for manual testing or adjustment after installation.

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.