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5 procedures that you would use for CFC or HCFC to ensure optimal system performance. In general, systems will require a smaller charge size than those using CFC or HCFC. If the original capillary tube is used, it will generally be necessary to undercharge the system to prevent liquid flood back to the compressor. Special care should be taken when charging with refrigerant blends, as presented in section 4. 15 - Run the system and charge additional refrigerant if needed until full-charged. The use of an expansion device not optimised for the system, such as the original capillary tube, will make the system more sensitive to charge and/or operating conditions. As a result, system performance will change more quickly if the system is overcharged (or undercharged). To avoid overcharging, it is best to charge the system by first measuring the operating conditions (including discharge and suction pressures, suction line temperature, compressor amps, superheat) before using the liquid level sight glass as a guide. 16 - Monitor the system operation and performance for at least 48 hours or longer and make necessary adjustment. 17 - Check remaining content of mineral oil with a refractometer or oil test kit. 18 - Follow the system and/or compressor manufacturer recommendations as tolerance are dependent on the system and its operating conditions. 19 - Label the system (as shown in the downloadable data sheet). After retrofitting the system, label the system components to identify the refrigerant and specify type of lubricant (by brand name) in the system. This will help ensure that the proper refrigerant and lubricant will be used to service the equipment in the future. 115 RetrofittingPDF Image | Manual for Refrigeration Servicing Technicians
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