Product details
Danfoss MP55 Differential Pressure Switch | Oil Safety Control | 060B017091
Product Description: The MP55 (060B017091) acts as a safety guard for compressors. In the UAE’s demanding refrigeration sector—where compressors in cold stores and supermarkets operate under heavy thermal loads—maintaining proper lubrication is critical. This switch monitors the differential between the oil pump discharge pressure and the crankcase pressure. If the oil pressure falls below the setpoint for a predetermined time (thermal time relay), the switch trips to shut down the compressor before mechanical damage occurs. The 060B017091 model is renowned for its reliability and is a standard spare part for HVAC/R technicians in Dubai and Abu Dhabi.
Key Features & Benefits:
- Critical Compressor Protection: Prevents expensive compressor burnouts and mechanical seizures by ensuring constant lubrication.
- Integrated Thermal Time Relay: Features a built-in time delay (typically 60, 90, or 120 seconds depending on the sub-model) to prevent nuisance tripping during compressor start-up.
- Versatile Application: Suitable for use with both HCFC and non-flammable HFC refrigerants commonly used in the UAE.
- Adjustable Differential: Allows precise setting of the required oil pressure safety margin to match specific compressor manufacturer requirements.
- Clear Operational Status: Often includes a “test” function to allow technicians to verify the electrical trip circuit without de-pressurizing the system.
Technical Specifications:
| Specifications | Value |
| Manufacturer | Danfoss |
| Series | MP55 |
| Code Number | 060B017091 |
| Differential Range $\Delta p$ | 0.30 – 4.50 bar |
| Time Relay Delay | 60 Seconds (Standard for this code) |
| Max. Working Pressure | 17 bar (245 psig) |
| Contact Function | SPDT |
| Enclosure Rating | IP20 |
FAQs:
- Q: Why is the time delay important for UAE cooling systems?
- A: During start-up, oil pressure takes a few seconds to stabilize. The delay prevents the switch from tripping immediately, allowing the system to reach normal operating conditions.
- Q: Can the MP55 be used with ammonia (R717)?
- A: No, the standard MP55 (060B017091) is for fluorinated refrigerants. For ammonia applications in the UAE, the MP55A version must be used.
- Q: What should I do if the switch trips frequently in my Dubai facility?
- A: Frequent tripping usually indicates a mechanical issue, such as a clogged oil filter or a failing oil pump, rather than a switch fault.
