Johnson Controls P29NC-42 Pressure Control

The Johnson Controls P29NC-42 is a robust low pressure cutout control designed for refrigeration systems requiring reliable lube oil pressure monitoring. This model, which is identical to the P29NC-42C, features a manual reset mechanism to ensure system faults are addressed before restarting equipment. Built to handle 120/240 Vac applications, it provides critical protection against low suction pressure or loss of prime. With an adjustable range of 20" Hg to 100 PSIG, it offers the flexibility needed for various commercial refrigeration setups. The integrated time delay prevents nuisance tripping during startup or transient pressure fluctuations, while the 36" capillary with a 1/4" flare nut ensures a secure connection to the suction line.

• Prevents Compressor Failure: Acts as a failsafe against low oil pressure or refrigerant loss.
• Interchangeable Design: Directly replaces the P29NC-42C for seamless field installation.
• Reduced Nuisance Trips: The built-in 60-second time delay allows pressure to stabilize before the cutout engages.
• Durable Construction: Features a weather-resistant enclosure and high-grade bellows for long-cycle life in demanding environments.
• Field Calibration: External scale allows for precise setpoint adjustments without removing the cover.

Is the P29NC-42 compatible with all refrigerants?
It is designed for use with non-corrosive refrigerants common in HVACR systems. Always verify chemical compatibility with bellows materials for specialized applications.

How do I wire the time delay circuit?
The unit utilizes standard terminal markings. Ensure the lube oil pressure switch is wired in series with the compressor contactor coil, and the heater circuit is energized via the motor starter.

Can the time delay be adjusted in the field?
No, the time delay interval is factory-set to ensure consistent protection and prevent tampering with safety parameters.

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.