supermarket refrigerated showcase filter drier disassembly, diagnosis and maintenance

The failure rate of the filter drier itself is extremely low, but after the supermarket refrigerated showcase refrigeration system is opened, the filter is in contact with the air It will absorb the moisture in it and reduce performance, so as long as the refrigeration system is opened, the filter drier must be replaced, and the filter package can be opened before replacement. For models using R12 refrigerant, the dry filter may not be replaced, but the dry filter must be activated.

1. Dryer filter disassembly and precautions. The refrigeration system deflates the middle of the nozzle of a pair of dry filter to heat it to separate it from the capillary tube, condenser or anti-dew nozzle. Filter installation is the reverse process of disassembly, but pay attention to the following three points.

1. The model of the filter drier should be the same. The model of the filter drier is determined by the refrigerant. Because of the different refrigerant models, the molecular diameter is different and the requirements for the filter drier are different. Generally speaking, R12 refrigerant uses ordinary filters, R134a refrigerant uses HX-7 or HX-9, and R600a refrigerant uses HX-9 dry filter.

2. It is the refrigeration system to repair leaks or replace faulty components before installing a new dry filter and opening the package before installation.

3. Weld the filter drier and the condenser connection pipe first, apply brass welding rod: then weld the filter drier and the capillary connection pipe mouth, apply silver welding rod, the capillary tube mouth should be straight into the filter pipe mouth about 1.5 mm , The flame of the welding torch should be adjusted down, and only the middle of the filter nozzle can be heated, not the capillary tube, so as not to damage the capillary tube. Diagnosis of the filter drier is dirty or blocked by welding, which is caused by improper operation during the maintenance of the supermarket refrigerated showcase refrigeration system, condensation and frosting of the drier, and the temperature of the drier is lower than normal when you touch the drier, you must judge the dryness The filter is blocked. The venting method diagnoses whether the filter drier is blocked or not. When the compressor is running normally, use a wire pliers to cut off the capillary tube about 2 cm from the nozzle of the drier filter, and it is satisfied that the capillary port cannot be blocked. If no gas is discharged from the capillary tube on the side of the filter drier, check the filter drier. To activate the filter, use the welding torch to heat and dry the filter in the middle of the carbonization flame for a few seconds to restore the performance of the filter. [Note] After troubleshooting the refrigeration system, the drier can be activated before the refrigeration system is blown through and evacuated. This method is only applicable to R12 refrigerant models.

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