supermarket refrigerated showcase refrigerant charging method (two)

When the filling meets the requirements, immediately close the cylinder valve, and then let the remaining supermarket refrigerated showcase refrigerant in the pipe If it is sucked into the system as much as possible, and finally the multi-purpose channel is closed, and the compressor is stopped, the refrigerant charging is basically finished. In addition to the method of charging the refrigerant with the suction valve multi-channels, the Freon liquid can also be directly filled into the system through the discharge valve multi-channels. The advantage of this method is that the filling speed is fast and safe. It is suitable for the first time the system is evacuated and filled with refrigerant. The position of the steel cylinder should be higher than the reservoir of the system during filling, and it can enter the system by itself by the pressure difference and height difference between the refrigerant in the cylinder and the system. When the pressure in the system is higher than 0.3MPa, liquid filling on the high-pressure side should be stopped. If the charge is not enough, it can be changed to charge refrigerant vapor on the suction side. When filling Freon on the high-pressure side, never start the compressor, and pay attention to the exhaust valve not to leak, otherwise it will cause liquid shock. Another method is to set up a special fluorine filling valve on the pipeline between the accumulator and the expansion valve, which is mainly used in large-scale freon systems, which is very similar to ammonia filling. One thing to note during the filling process is that it is generally not allowed to use the method of heating the freon cylinder to speed up the filling speed, otherwise it is very unsafe. Only when the outside temperature is very low, should proper heating be used to speed up the filling speed, but it should also be noted that the temperature should not be too high. The steps of filling ammonia are similar to the above-mentioned filling of fluorine. The filling process is roughly as follows: when filling ammonia, it can be added directly from the ammonia filling station. When the supermarket refrigerated showcase is filled with ammonia for the first time, the system can be evacuated, and the ammonia cylinder valve and the ammonia filling valve can be connected to inject ammonia into the system by using the pressure difference between the system and the ammonia cylinder. When the system pressure rises to about 0.2MPa, in order to speed up the ammonia filling, the high-pressure part and the low-pressure part of the system are cut off, and at the same time, close the discharge valve of the accumulator or the main liquid supply valve before the throttle valve, and then start the cooling The water pump, start the compressor, reduce the pressure of the low-pressure part, and charge a large amount of ammonia until the ammonia charge is 50%~70% of the calculated total. Suspend the ammonia charge, let it run for a test, observe the test run, and find that it is insufficient Then continue to add.

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