③ blow to the system Pass, replace the dry filter, evacuate, add refrigerant, and seal. [Note] For the old model, after checking that the refrigeration system is indeed free of leaks and the compression and exhaust performance is good, it is estimated that the inner wall of the capillary tube adsorbs the membrane fouling from the refrigerant oil of the compressor, and about 15 cm of the capillary tube can be cut off. Compensate for the small refrigerant flow caused by the decrease in the inner diameter of the capillary tube.

five refrigerated showcase display cases BCD-245 refrigeration poor common failure phenomenon: poor cooling, compressor running sound is normal, the exposed refrigeration pipeline and the middle door frame are not abnormal. Failure analysis: Mostly the connection port between the evaporator and the air return pipe leaks, which reflects the yellowing and discoloration near the display cases of the return air pipe. Because this model has a design defect, that is, the freezer compartment evaporator is a steel tube, and the return pipe is a copper tube (with a capillary tube). ), due to the impact of cold air from the air return pipe during display cases, the holes are cold and hot outside, and the sealing plug is not tight, the interface between the evaporator and the air return pipe is likely to produce dew, which will connect the two different materials It is easy to corrode and leak, resulting in poor cooling. Troubleshooting: unplug the power supply, open the compressor process pipeline to deflate, observe that the amount of refrigerant discharged is small, unscrew the condenser fixing screw, move the condenser at an angle to see that the return pipe exits the display cases and the holes are discolored and yellow. It roughly shows that the connection port of the return air pipe of the evaporator is leaking. Although there are many ways to repair the leak, the most reliable method is to replace the return air pipe, which requires 8 steps.

①Fix the condenser idea, open the upper and lower evaporator interface boxes, mark the upper and lower evaporator connection pipe ports, and use a damp cloth or other fireproof materials to weld Block around the mouth and weld open the welds.

②Pry down the freezer compartment evaporator fixing clip, remove the fixing bracket, and pull out the freezer evaporator.

③Remove the return pipeCut the capillary tube 2 cm inside the sheathed plastic tube, and save the cut short capillary tube.