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4 Volumetric charging by graduated cylinder Using graduated charging cylinder is one of the most popular charging methods, an example is shown here: In both cases, it is extremely important that a pressure control relief valve and thermostat be used to provide the required temperature and pressure safety controls. The system has a pressure gauge and hand valve on the bottom for filling the charging cylinder liquid refrigerant into a system. It also has valve at the top of the cylinder. This valve is used for charging refrigerant vapour into the system. Mass charging by balance Graduated charging cylinder It uses a glass tube liquid level indicator, which allows a technician to transfer refrigerant into a system and measure the amount on a scale. Some cylinders are electrically heated to speed up the evaporation and maintain pressure in the cylinder. This process of electrically heating cylinder is usually done with an electrical insert. In some cases, the compressor itself is heated, using a heat gun so the refrigerant and oil will circulate and be purged more easily. Using an electronic weight balance, such as the one shown here: Electronic weight balance is typically one of the most accurate ways to charge refrigerant. System charging could be performed in vapour or liquid phase. This is generally done in smaller systems, which are more sensitive to charge size. Therefore it is important to be aware of the additional refrigerant within the refrigerant hoses, and the artificial weight of the hoses themselves on the balance reading, so that the actual mass added to the system is not erroneous. CHAPITRE 4 PAGE 16 103 Servicing PracticesPDF Image | Manual for Refrigeration Servicing Technicians
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