Johnson Controls P74FA-1 Pressure Control

The Johnson Controls P74FA-1 is a professional-grade differential pressure control designed for precise monitoring of pressure variations between two sensing points. This heavy-duty SPDT snap-acting switch is a standard for contractors managing chillers, water-cooled condensers, and heating coils where proof of flow is critical for system protection. Engineered with durable brass bellows, the unit handles non-corrosive refrigerants, air, and liquids with ease. It features an 8 to 60 psi adjustable range and a 1.5 psi fixed switch differential, allowing for tight operational tolerances in demanding machine room environments. The 1/4" male flare connection (Style 5) ensures a secure fit, while the 6 Amp rating at 208-600 Vac/Vdc provides the electrical versatility needed for integration with various HVACR control systems. With its calibrated scale and external adjustment wheel, setting the pressure differential set point is straightforward—no need to remove the cover during routine maintenance. Whether you are using it for lube oil pressure sensing or verifying pump operation, the P74FA-1 delivers the reliability veteran technicians expect from Penn pressure controls.

• Durable Construction: High-quality brass bellows and a cold-rolled steel enclosure withstand high overrun pressures and harsh mechanical room conditions.
• Precise Switching: Features a snap-acting SPDT switch with a 1.5 psi fixed differential to prevent contact bounce and ensure consistent system feedback.
• Broad Compatibility: Rated for a wide electrical range (up to 600 Vac/Vdc) and compatible with air, oil, and non-corrosive liquids.
• Efficient Installation: Includes a universal mounting bracket and 1/4" SAE male flare connectors for rapid field deployment.

• Can this be used as a replacement for the P74FA-1C? Yes, the P74FA-1 is technically identical to the P74FA-1C model.
• What are the primary applications for this control? It is commonly used for flow detection across chillers, proof of pump operation, and as a lube oil failure cutout (without time delay).
• Is the setpoint adjustable under pressure? Yes, the external adjustment wheel allows you to modify the 8 to 60 psi range without removing the housing.

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.