The refrigeration unit pressure controller is a key component used to monitor and control the refrigerant pressure in the refrigeration system. In the refrigeration cycle, the refrigerant circulates between the compressor, condenser, expansion valve and evaporator to absorb and release heat. The role of the pressure controller is to ensure that this process operates within a safe and effective pressure range.
1. Refrigeration unit high and low pressure controller
The pressure controller usually includes the following functions:
High pressure protection: When the pressure in the system exceeds the set safety value, the high pressure controller will shut down the compressor to prevent excessive pressure from damaging the system or causing safety problems.
Low pressure protection: If the pressure in the system is lower than the normal operating range, the low pressure controller will stop the compressor to avoid the compressor running under inefficient or unstable conditions, which may cause compressor damage or poor refrigeration oil lubrication.
Pressure regulation: Some pressure controllers can adjust the system pressure to maintain the best operating state, for example, by adjusting the opening of the expansion valve to control the amount of refrigerant entering the evaporator.
Alarm and indication: The pressure controller can also receive pressure warning function.
High pressure high pressure controller: The compressor discharge pressure is too high and the power is cut off and stopped. After eliminating the cause of the high pressure, it needs to be manually reset to start the compressor.
Low pressure controller: When the suction pressure is low to the lower limit, the power is cut off and the compressor is powered on to start when the suction pressure rises to the upper limit.
2. Refrigeration unit oil pressure controller
The oil pressure controller of the refrigeration unit is a key component specially used to monitor and control the lubricating oil pressure inside the compressor. In the refrigeration system, the compressor needs lubricating oil to lubricate its moving parts, such as bearings and pistons, to reduce wear and ensure smooth operation. The main function of the oil pressure controller is to monitor the oil pressure generated by the oil pump and compare it with the refrigerant pressure on the suction side of the compressor.
If the oil pressure is lower than the set minimum value or the oil pressure difference is insufficient, the controller will trigger a safety mechanism, such as cutting off the power supply to the compressor to prevent the compressor from being damaged due to poor lubrication. The oil pressure controller can be connected to the alarm system, and an alarm will be issued when the oil pressure or oil pressure difference is lower than the safety threshold, reminding maintenance personnel to check and make necessary repairs.
