Danfoss MP55A Oil Differential Pressure Switch | For Ammonia (R717) | 45s Time Relay

Product Description:

The Danfoss MP55A (060B017591) is a critical safety component for large-scale industrial refrigeration and ice plants across the UAE. It is specifically engineered for use with Ammonia (R717), featuring stainless steel bellows that resist the corrosive nature of the refrigerant. The switch monitors the differential pressure between the oil lubrication system and the crankcase pressure. If the oil pressure falls below the set limit for more than 45 seconds, the integrated thermal relay trips the system to prevent catastrophic compressor failure. This delay is essential in Dubai’s heavy-duty environments to allow for normal pressure fluctuations during start-up, ensuring maximum uptime while providing uncompromising protection for your expensive industrial assets.

Key Features & Benefits:

• Ammonia Ready (R717): Equipped with high-grade stainless steel bellows, making it the industry standard for UAE ammonia refrigeration racks.
• 45-Second Safety Delay: Built-in time relay prevents nuisance tripping during compressor start-up or momentary oil foam in Dubai heat.
• Reliable Oil Protection: Constant monitoring of the oil differential pressure ensures the compressor never runs without proper lubrication.
• Adjustable Differential: Allows technicians in the UAE to fine-tune the trip point (0.3 to 4.5 bar) based on specific compressor requirements.
• Visual Trip Indicator: Features a red lamp/signal capability to alert UAE maintenance teams immediately when a lubrication fault occurs.

Technical Specifications :

FAQs:

• Q: Can I use the MP55A with standard Freon systems in Dubai?
• A: Yes, while it is designed for Ammonia (A stands for Ammonia), the stainless steel construction is also fully compatible with standard fluorinated refrigerants used in the UAE.
• Q: Why is the 45-second delay important for UAE sites?
• A: During the extreme temperatures in Dubai, oil can become thin or foamy during start-up. The 45-second window prevents the system from shutting down unnecessarily while still protecting the hardware.
• Q: Is the reset manual or automatic?
• A: For safety reasons, the 060B017591 features a Manual Reset, ensuring a technician must inspect the oil system before the compressor can restart in the UAE.