Refrigerant filling method of water-cooled screw chiller

　　【】The refrigerant plays a vital role in refrigeration equipment. This is something that everyone in this industry needs to understand. What are the refrigerant charging methods for water-cooled screw chillers? Let’s take a look with the editor today!

　　 Generally, refrigerants can be divided into five categories according to their chemical composition:

　　1, Freon;

　　2, unsaturated hydrocarbon refrigerants ;

　　3, saturated hydrocarbon refrigerant;

　　4, inorganic compound refrigerant;

　　5, azeotropic refrigerant. In these five categories, water-cooled screw chillers usually use R-22 type refrigerant, and the chemical composition is difluoro-chloromethane. Mainly used in medium and low temperature commercial refrigeration, catering refrigeration, supermarket display cabinets, residential and commercial air conditioning systems.

What are the filling methods of 　　 water-cooled screw chiller refrigerant?

After the 　　 refrigeration system has been strictly tested without leakage, the refrigerant can be charged. There are two ways to charge refrigerant:

　　 1. Filling from the bypass hole of the compressor discharge valve

　　 is to inject Freon liquid directly into the system. Its advantage is that the filling speed is fast and safe, and it is suitable for the situation that there is no refrigerant in the system and the vacuum has been evacuated, that is, it is suitable for s* times of filling. It relies on the pressure difference and height difference between the freon in the cylinder and the system to discharge into the system by itself. If you use this method to infuse freon steam. The injection volume is very small, and only when the liquid is injected can it be injected more and quickly. Moreover, the freon in the bottle is not completely filled. When the pressure in the system is higher than 3KG/MC2, the filling on the high-pressure side should be stopped. If the filling volume is insufficient, it can be filled from the suction side. When filling freon from the high-pressure side, Never start the compressor to avoid accidents.

　　2. Filling from the compressor suction valve bypass hole

　　 Filling freon gas from the low pressure side of the compressor, start the compressor and do not inject liquid refrigerant to avoid the machine Liquid hammer occurred. This method is suitable for the situation that the system is insufficient and needs to be refilled. In our country's general commercial or canteen, the small Freon refrigeration system is usually in the form of a unit, and most of the high-pressure parts are filled with Freon in the manufacturing plant. Therefore, most small Freon devices need to be supplemented with refrigerant. Through the above detailed explanation, let us know what are the refrigerant filling methods of water-cooled screw chillers. We can make corresponding choices based on some real problems, which will not only improve our work ability, but also Let us operate the machine very smoothly.