Johnson Controls P545NCB-22 Oil Control

The Johnson Controls P545NCB-22 Electronic Lube Oil Control is a critical safety component for refrigeration compressors equipped with oil pumps using single-point differential pressure switches. This 120/240 VAC oil pressure switch provides precision monitoring of lubrication levels, utilizing a 120-second time delay to prevent nuisance tripping during start-up or transient pressure fluctuations. Engineered for non-corrosive refrigerants, it maintains a tight setpoint of 12.75 PSI ± 0.75 PSID, ensuring the compressor shuts down before mechanical failure occurs. The unit features manual reset functionality and dedicated alarm and liquid line solenoid outputs, allowing for seamless integration into existing control circuits. With enhanced noise immunity that exceeds UL 991 and IEC standards, this control delivers stable performance in high-interference industrial environments. Field diagnostics are simplified via front-mount LED status indicators and a built-in test circuit for verifying operational integrity without external equipment.

Key Benefits for Contractors

• Universal Voltage Compatibility: Supports both 120V and 240V 50/60 Hz power supplies, reducing the need for multiple truck stock items.
• Advanced Compressor Protection: The 120-second anti-short cycle delay prevents excessive wear on contactors and motor windings from rapid cycling.
• Standardized Integration: Includes SPDT relay contacts for independent control of alarm systems and solenoid valves.
• Rugged Construction: Built with cold-rolled steel housing and rated for ambient temperatures from -40°F to 141°F.
• Safety Compliance: UL Listed and Recognized for use in commercial and industrial refrigeration applications.

Common Questions

What is the maximum working pressure for this control?
The P545NCB-22 is rated for a maximum working pressure of 100 PSI, making it suitable for standard low and medium-backpressure systems.

Does this unit require a specific pressure transducer?
This electronic control is designed to work with a single-point differential pressure switch typically found on semi-hermetic compressor oil pumps.

Can I use this with ammonia systems?
No, this specific model is designed for non-corrosive refrigerants only. For ammonia or corrosive applications, a stainless steel compatible model must be specified.

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.