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Rapport 2414173 - October 2007 __________________________________________________________________ If R744 is charged directly from the cylinder into the system (with compressor being shut- down), the following will happen : • the cylinder pressure will progressively decrease. After a small number of recharges, the cylinder pressure decreases. It will not be sufficient to charge refrigerant when the system pressure reaches the R744 vapor pressure; the cylinder will not be fully exploited and part of refrigerant will be left in the cylinder and wasted. • the efficiency of charging operation depends on the pressure in the cylinder, and thus on the ambient temperature. In a workshop, it is recommended to use a charging station that is suitable for R744 refrigerant. This station (see Figure 51 and 52) will enable fine charge tuning and full cylinder exploitation. Figure 51 : Charging station for R744 refrigerant __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 47/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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