Danfoss MP55 Differential Pressure Switch | Oil Safety Control | 060B017191

Product Description: The MP55 (060B017191) monitors the pressure difference between the oil pump discharge and the compressor crankcase. In the UAE’s high-demand refrigeration environments—such as large-scale cold storage in Sharjah or supermarket racks in Dubai—consistent lubrication is essential to prevent catastrophic compressor failure. This switch features an integrated thermal time relay with a 90-second delay. If the oil pressure differential falls below the safety setpoint, the relay counts down and trips, shutting down the compressor to prevent mechanical seizure. The 90-second delay is specifically chosen to allow for pressure stabilization during start-up or temporary fluctuations common in Middle Eastern cooling cycles.

Key Features & Benefits:

• 90-Second Time Delay: Provides an optimal window for oil pressure to build up during start-up, reducing nuisance trips in high-ambient UAE conditions.
• Essential Mechanical Protection: Acts as the primary defense against expensive compressor burnouts caused by oil pump failure or clogged filters.
• Universal Compatibility: Suitable for use with all common HCFC and non-flammable HFC refrigerants used in the UAE refrigeration market.
• Robust Contact System: Features a high-quality SPDT switch designed for long service life in industrial control panels.
• Precision Adjustment: Allows for fine-tuning of the differential setpoint to match the specific safety requirements of various compressor brands.

Technical Specifications:

FAQs:

• Q: Why choose the 90-second delay (060B017191) over the 60-second version?
• A: The 90-second delay is often preferred for larger compressors or systems with longer oil lines common in UAE industrial plants, providing more time for oil pressure to stabilize.
• Q: Can this switch be used in coastal Abu Dhabi facilities?
• A: Yes, but since it is rated IP20, it must be installed inside a protected electrical control panel to shield it from humidity and salt air.
• Q: How can I verify if the time relay is working correctly?
• A: The unit features a manual test function that allows technicians to simulate a trip and verify the electrical cutout circuit without needing to drain the oil.