Description
The Johnson Controls P545NCB-22 is a professional-grade Electronic Lube Oil Control engineered to protect compressors from low oil pressure conditions in commercial and industrial refrigeration systems. Designed for use with non-corrosive refrigerants only, this control delivers reliable, precise monitoring with built-in safety features that help extend compressor life and minimize costly downtime.
How It Works
The P545NCB-22 continuously monitors the differential oil pressure across the compressor. If oil pressure falls below the setpoint, the 120-second time delay activates — allowing the system a brief window to recover before the control trips. If pressure is not restored within the delay period, the unit shuts down the compressor and triggers its manual reset function, requiring a technician to inspect and clear the fault before restart. This manual reset requirement adds an important layer of protection against repeated compressor damage.
Key Features
- Operating Voltage: 120/240 Vac
- Time Delay: 120 seconds
- Differential Pressure Setpoint: 12.75 PSI ± 0.75 PSID
- Manual reset with lockout protection
- Alarm output for remote fault notification
- Liquid line solenoid output for system-level shutdown integration
- Designed for non-corrosive refrigerants only
Alarm & Solenoid Outputs
The P545NCB-22 includes both an alarm output and a liquid line solenoid output, enabling seamless integration with building automation systems, remote annunciators, and liquid line solenoid valves. When a fault occurs, the alarm output can signal a remote panel or monitoring system, while the solenoid output de-energizes the liquid line solenoid to prevent refrigerant migration and further system damage.
Application
- Commercial and industrial refrigeration compressor protection
- Compatible with non-corrosive refrigerant systems
- Suitable for systems operating at 120 Vac or 240 Vac
- Ideal for retrofit or new installation in compressor racks and chillers
Why Choose the Johnson Controls P545NCB-22?
Johnson Controls is a trusted name in HVAC and refrigeration controls. The P545NCB-22 combines accurate differential pressure sensing, a configurable time delay, and dual output capability in a single, robust package — giving technicians and facility managers confidence that their compressors are protected around the clock.
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