Mixed refrigerant R407C (R32 / R125 / R134a) is an environmental non-ozone-depleting refrigerants. R407C and R22 has a very similar because the features and performance, so long as R22 alternatives, for use in a variety of air-conditioning systems and non-centrifugal refrigeration system. R22 R407C could be used for the system, not to re-design the system, only a small number of parts to replace the original system, and the original system replaced the mineral refrigeration oil lubricants miscible with R407C (POE oil), you can directly charge R407C, to achieve environmental protection original equipment replacement. Since R407C is a mixed non-azeotropic refrigerant, in order to ensure its mixed composition does not change, it must be liquid R407C charge. If the system R407C refrigerant leakage occurs, and the apparent performance of the system changes, the system can not be recycled and the remaining use of R407C, remaining within the system to vent refrigerant R407C, re-charge the new refrigerant R407C.