P74FA-10C Johnson Controls Pressure Control

Overview

The Johnson Controls P74FA-10C is a differential pressure switch designed to measure the pressure difference between two sources, such as supply and return lines. It features a single-pole double-throw (SPDT) snap-acting switch mechanism that actuates at a specific differential pressure setpoint to trigger corrective actions in commercial HVAC and building automation systems.

Features

• Features a completely enclosed contact mechanism for reliable operation.
• External adjustment cam allows the setpoint to be easily changed without removing the cover.
• Calibrated internal scale provides a clear visual indication of the pressure setpoint.
• Equipped with 36-inch copper capillary tubes with a 1/4-inch flare nut connection.
• Built with a durable steel case and robust brass bellows for long-term stability.

Specifications

• Pressure Range: 2 to 26 PSI (adjustable)
• Differential: Fixed 1.5 +/- 1.2 PSI
• Contact Form: SPDT
• Electrical Rating: 6A full load at 120 VAC, 10A non-inductive at 120 VAC
• Maximum Proof Pressure: 120 PSI
• Burst Pressure: 180 PSI
• Operating Temperature: 32 to 104 degrees Fahrenheit (0 to 40 degrees Celsius)

Applications

• Monitoring lube oil pressure differential on refrigeration compressors.
• Detecting fluid flow across water chillers and water-cooled condensers.
• Proving pump operation in commercial heating and cooling systems.
• Integrating with motor actuators for precise environmental controls.