Danfoss MP55 Differential Pressure Switch | Oil Safety Control | 060B017291

Product Description: The MP55 (060B017291) is a safety switch that ensures a compressor only operates when its internal lubrication pressure is sufficient. In the high-temperature environment of the UAE, refrigeration systems in Dubai’s logistics hubs and Abu Dhabi’s industrial plants run at peak capacity. This model features a 120-second thermal time relay—the longest delay in the standard MP55 range. It monitors the pressure difference between the oil pump and the crankcase. If this difference drops below the setpoint for more than 120 seconds, the switch cuts power to the compressor, preventing catastrophic mechanical failure due to oil starvation or foaming.

Key Features & Benefits:

• 120-Second Time Delay: Specifically designed for large-scale systems where oil pressure may take longer to stabilize, reducing nuisance trips during complex start-up sequences in UAE plants.
• Maximum Compressor Security: Provides a reliable fail-safe against oil pump malfunctions, clogged filters, or low oil levels.
• Broad Refrigerant Compatibility: Fully compatible with HCFC and non-flammable HFC refrigerants (e.g., R404A, R134a, R407C, R507) used across the Middle East.
• Vibration Resistant: Built to maintain accurate setpoints despite the mechanical resonance of heavy-duty industrial compressors.
• Intuitive Setup: Features a clear scale for differential pressure adjustment, allowing UAE technicians to easily match the switch to specific compressor requirements.

Technical Specifications:

FAQs:

• Q: Why use the 120-second version (060B017291) in the UAE?
• A: In very large installations or systems with high-capacity compressors, the oil return can be slow. The 120-second delay ensures the system doesn’t trip prematurely before the oil has time to circulate fully.
• Q: Can this switch be used with ammonia (R717)?
• A: No. Like other standard MP55 models, the 060B017291 is for fluorinated refrigerants only. For ammonia, the “A” version (e.g., MP55A) is required.
• Q: Is there a manual reset on this model?
• A: Yes, once the thermal relay trips due to low oil pressure, it requires a manual reset after the relay has cooled down, ensuring a technician investigates the cause of the failure.