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Some matters needing attention in display cooler maintenance (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 520Time: 2016-08-22
Some matters needing attention in display cooler maintenance
Before connecting the refrigeration pipes, the two pipe ports of the display cooler should be polished clean, and the ordinary pipe ports should be inserted about lcm-1.5cm; the capillary should be inserted into the dry filter The inner diameter of the reducer and the evaporator is about 1.5cm; for the embedded evaporator model, a section of reducer should be connected between the capillary and the evaporator to protect the capillary and facilitate the insertion of the pipeline.
The top of the flame core of a neutral flame is used to heat the refrigeration pipeline when welding, and it is not possible to use a lot of solder to solder a solder joint for a long time. Copper and copper pipes are welded with silver electrodes, and copper pipes and other metal pipes are welded with copper electrodes; ordinary pipe welding, heating the joints of the two nozzles and periodic heating: capillary welding, can not heat the capillary, only The middle part of the nozzle of the filter drier or the evaporator is heated to avoid welding or welding of thin capillaries. Suppressing pressure should be moderate, too high will cause the system pipeline to burst, too low to find leaks. Generally, the total pressure and the low pressure are between 0.6MPa and 0.8MPa, and the high pressure is between 1.0MPa and 1.2MPa. When confirming that there are leaks in the display cooler refrigeration system, the total pressure does not leak. The leaks are generally in the high-pressure pipeline. In addition, it is not possible to reform the compressor with R12 refrigerant to suppress the R134a refrigerant display cooler, because the refrigerant oil of the two compressors is different.
When pumping with a vacuum pump when pumping down, check that the oil level line of the vacuum pump is in the normal position before pumping down. Take the time to reach 40 minutes. The modified compressor can be used to evacuate R12 refrigerant models, and the evacuation time is generally about 1 hour.
When filling the refrigerant, the refrigerant type should be the same. Before filling, the air in the filling pipe must be discharged first, and the valve of the refrigerant bottle should be closed after each filling. Filling the display cooler with liquid refrigerant (that is, the refrigeration bottle is inverted) must be stopped to avoid liquid hitting the compressor valve and causing damage to the compressor. The sudden increase in noise during the filling process is due to the blockage of the refrigeration system (mostly welding blockage or dirty blockage); the display cooler part of the condenser is hot and the local temperature is not clean when it is evacuated; the return pipe is frosted because the refrigerant is overfilled.
When sealing, the jaws of the sealing pliers should be moderate. If the sealing is too large, it will not be tight, and it will be easy to clamp the sealing when it is too small.
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