P74HA-14C Johnson Controls Pressure Control

Overview

The Johnson Controls P74HA-14C is a heavy-duty differential pressure control designed to sense differences in pressure between two points. It is specifically engineered for use with ammonia and non-corrosive refrigerants, serving as an operating or limit control in commercial refrigeration and HVAC systems. The control features an electromechanical design where the main contacts close on an increase in differential pressure, while separate auxiliary contacts open.

Features

• Designed with 4-wire configuration featuring a dual-contact structure
• Main contacts close on differential pressure increase, separate auxiliary contacts open
• Built with durable brass bellows for ammonia application compatibility
• Features a completely enclosed contact mechanism to ensure long life and high contact force
• Direct reading calibrated scale allows for clear setpoint visualization
• Adjustable setpoint design allows for quick changes without removing the cover

Specifications

• Setpoint Range: 8 to 60 psi adjustable
• Switch Differential Range: 6 to 20 psi adjustable
• Pressure Connection: 1/4 inch Male NPT / Male Flare
• Switch Type: SPDT (Snap Acting) / 4-Wire dual-contact configuration
• Reset Type: Automatic
• Bellows Material: Brass

Applications

• Differential pressure sensing on water-cooled condensers or chillers
• Lube oil failure cutout on refrigeration compressors to protect against loss of lubrication
• Detecting flow and monitoring pressure drop across supply and return lines in water and heating systems
• Applications requiring both a run signal and a safety lockout within a single device