P29NA-3C Johnson Controls PressureSURE Control

Overview

The Johnson Controls P29NA-3C is a field-proven low pressure cutout control with an integrated time delay relay designed for commercial refrigeration and HVAC systems. Serving as a primary safety control, it protects compressors from damage by monitoring suction pressure and automatically shutting down equipment when levels drop below safe thresholds. It features an auto recycle function that restores operation automatically once safe pressure returns.

Features

• Built-in thermal time delay function to prevent nuisance tripping from momentary pressure fluctuations
• Auto recycle operation that automatically resets when safe pressure is restored
• Robust bellows-actuated mechanism ensuring tight tolerances in demanding environments
• Ambient temperature compensation to minimize the effect of location variations on timing
• Single pointer scale indicating cutout pressure for easy adjustment

Specifications

• Brand: Johnson Controls
• Model: P29NA-3C
• Control Type: Low Pressure Cutout
• Reset Type: Auto Recycle
• Voltage: 24 Vac
• Pressure Range: 20 in. Hg Vacuum to 100 PSIG
• Element Style: Style 13 (1/4 in. flare nut)

Applications

• Commercial refrigeration and air conditioning systems for critical low-side suction pressure monitoring
• Chiller low temperature cutout by wiring the time delay relay to the compressor control circuit
• Industrial equipment forced oil lubrication systems to protect against a sustained loss of oil pressure