Wuxi Guanya Refrigeration Technology co., ltd

Solutions to high-pressure failures of deep-circulation chillers

Deep-circulation chillers are process cold sources used in the production and processing of chemical and pharmaceutical intermediates, petrochemicals, machinery, medicine, electronics, new materials, aerospace, optoelectronic technology, and new energy. But how to deal with the high-pressure failure of the deep-circulation chiller?

1. The cooling water temperature is too high, and the condensing effect is not good, resulting in high pressure failure
The rated working conditions of cooling water required by deep-circulation chillers, high water temperature and poor heat dissipation, will inevitably lead to high condensing pressure. This phenomenon often occurs in high-temperature seasons. It can be solved by adding more storage tanks.

2. The cooling water flow is insufficient, and the rated water flow is not reached, resulting in a high-pressure fault
The main performance is that the pressure difference between the inlet and outlet water of the unit becomes smaller and the temperature difference becomes larger. The reason for the insufficient water flow is the lack of water in the system or the presence of air. The solution is to install an exhaust valve at the height of the pipeline to exhaust; the pipeline filter is blocked or the selection is too fine, and the water permeability is limited. You should choose a suitable filter and Clean the filter regularly; the water pump is small and does not match the system.

3. High pressure failure due to fouling or clogging of the condenser
Its performance is that the pressure difference and temperature difference between the inlet and outlet of the deep circulation chiller become larger, and the upper and lower temperatures of the condenser are very high when you touch the condenser by hand, and the condenser outlet copper pipe is hot. The unit should be backwashed regularly, and chemical cleaning and descaling should be carried out if necessary.

4. The refrigerant mixed with air, nitrogen and other non-condensable gases causes high pressure failure
This situation generally occurs after maintenance, and the vacuum is not applied. It can only be drained, re-evacuated, and recharged with refrigerant.

5. False alarms caused by electrical faults produce high-voltage faults
Because the high-voltage protection relay is damp, poorly contacted or damaged, the unit electronic board is damp or damaged, and the communication failure causes a false alarm. For this kind of false fault, the HP fault indicator on the electronic board is often off or slightly bright, the high-voltage protection relay is manually reset invalid, or disappears automatically, the running current of the compressor is normal, and the suction and discharge pressures are also normal.

6. Too much refrigerant charge causes high pressure failure
This situation generally occurs after maintenance, and it is manifested as high suction and exhaust pressure and balance pressure, and high compressor operating current. It should be vented according to the suction and discharge pressure, balance pressure and operating current under rated conditions until normal.


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