Danfoss 060B200266 MP54 Pressure Control

The Danfoss 060B200266 MP54 Pressure Control is a critical safety switch engineered to protect refrigeration compressors from damage caused by low lubricating oil pressure. This differential pressure switch functions by monitoring the pressure variance between the oil pump discharge and the compressor crankcase, ensuring that the machine operates within safe lubrication parameters. Featuring a fixed differential setting of 9.0 psi and a 120-second thermal time delay, the MP54 allows the compressor to run during initial start-up or momentary pressure drops, but will break the control circuit if sufficient oil pressure isn't established or sustained within the 2-minute release window. Built with high-durability stainless steel bellows and a sturdy metal enclosure, this unit is designed for long-cycle reliability in demanding mechanical rooms. The 1/4" flare pressure connections provide a secure, leak-proof interface compatible with standard HVACR manifold and capillary setups.

• Enhanced Compressor Protection: Prevents catastrophic bearing failure by shutting down the system if oil differential pressure falls below the 9.0 psi setpoint.
• Integrated Thermal Time Relay: Includes a built-in 120-second delay to prevent nuisance tripping during transient pressure fluctuations or cold starts.
• Universal Compatibility: Approved for use with a wide range of refrigerants, including R22, R134a, R404A, R407C, and R507A.
• Simplified Testing: Features a manual trip and electrical test function, allowing for fast verification of the safety circuit without requiring specialized jumper wires.
• Rugged Construction: Utilizing stainless steel bellows ensures resistance to vibration and long-term fatigue in high-pressure environments up to 245 psig MWP.

How do you wire the MP54 for standard compressor protection?
The Danfoss MP54 typically utilizes a four-wire hook-up. The safety circuit is separate from the operational circuit, allowing it to be integrated directly into the contactor coil path while providing a signal to an alarm or controller via the S-terminal if a trip occurs.

Can the differential setpoint be adjusted on the 060B200266 model?
No, the Danfoss 060B200266 features a fixed differential of 9.0 psi. For applications requiring adjustable setpoints, a model from the MP55 series would be required. The fixed setting of the MP54 is ideal for many OEM specifications where tamper-proof operation is necessary.

What is the purpose of the 120-second release time?
The 120-second release time represents the maximum duration the compressor can run with insufficient oil pressure. This delay is essential because oil pressure is often not instantaneous upon start-up; it gives the pump time to prime and stabilize before the safety switch intervenes.

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.