Danfoss 060B201291 Pressure Switch

The Danfoss 060B201291 is a high-precision MP55 oil differential pressure switch engineered to protect industrial refrigeration compressors against low lubricating oil pressure. Serving as the direct replacement for 060B201266, this safety control operates independently of absolute pressure by measuring the difference between the oil pump discharge and suction pressure bellows. The unit features an adjustable differential pressure range from 4.3 to 65 psig (0.3 to 4.5 bar) via an internal setting disc and a manual reset function. A critical 60-second thermal time relay provides the necessary delay to allow oil pressure to stabilize during startup, preventing nuisance trips while ensuring rapid shutdown if lubrication fails during operation. This HVACR safety control is designed for use with HCFC and non-flammable HFC refrigerants, including R404A and R134a, and utilizes a standard 1/4-inch male flare connection for seamless integration into existing lube oil protection circuits.

Key Benefits:

• Adjustable Differential Settings: Provides a regulation range of 4.3 to 65 psig, allowing for precise calibration based on specific compressor requirements.
• Integrated Thermal Time Relay: Includes a factory-set 60-second delay to accommodate pressure fluctuations during the initial compressor start-up cycle.
• Enhanced Combatibility: Optimized for a wide array of non-flammable HFC refrigerants and HCFCs, making it a versatile OEM replacement part.
• Durable Construction: Features a robust enclosure with an IP20 rating and a bellows system capable of withstanding media temperatures up to 212°F.
• Direct Retrofit: Functions as a drop-in 060B201291 Danfoss pressure switch replacement for the discontinued 060B201266 model.

Common Questions:

Can I use the MP55 with ammonia (R717) systems?
No, the 060B201291 is intended for HCFC and HFC refrigerants. For ammonia applications, the Danfoss MP55A variant is the appropriate technical selection.

How do I adjust the differential pressure on this switch?
Technicians can adjust the set-point using the internal setting disc. The differential pressure value is clearly visible on the internal scale located inside the housing.

What happens if the oil pressure fails during operation?
If the differential pressure drops below the set-point, the safety switch activates the thermal relay. If pressure is not restored within 60 seconds, the contact system breaks the circuit to stop the compressor.

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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.