P29NC-2C Johnson Controls Pressure Control

Overview

The Johnson Controls P29NC-2C is a low pressure cutout control equipped with a built-in time delay relay and a trip-free manual reset mechanism. It is designed to safeguard HVAC, refrigeration, and industrial equipment against sustained low suction pressure or oil pressure lubrication failure, while preventing nuisance shutdowns caused by temporary pressure fluctuations.

Features

• Built-in 60-second factory-set time delay relay
• Trip-free manual reset mechanism requiring operator intervention after lockout
• Direct reading scale indication for clear pressure setting adjustments
• Dust-protected snap-action switch to maintain reliable electrical contact
• Replacement timing relays available for easier field service

Specifications

• Pressure Range: 20 inches Hg Vacuum to 100 PSIG
• Time Delay: 60 seconds
• Contact Form: SPST (Single-Pole Single-Throw)
• Electrical Rating: 120/240 VAC, pilot duty rating of 750 VA
• Pressure Connection: 1/4 inch male flare fitting
• Overpressure Rating: 325 PSIG maximum overpressure, 250 PSIG working pressure
• Differential: 2.2 +/- 1.5 PSI

Applications

• Chiller low temperature cutout by monitoring suction pressure to prevent freezing
• Industrial equipment oil pressure lubrication cutout on machines with forced oil systems
• Low suction pressure protection for commercial HVAC and refrigeration compressors