hello, look it depends on the equipment in question, if it has a capillary, you will surely have to remove the gas from the equipment by releasing it or recover the gas through a pinch valve, because there is no way to bottle the gas, if it has an expansion valve if you can recover as says the colleague. then see on the plate how much gas the equipment carries and then load it, then you should weld the pipes with nitrogen circulating to make clean welds, if you have differences in height you should make a small liquid trap at the exit of the evaporator. in suction pipe, lengthen the interconnection cables taking into account the earth and the section of the cable for the power of the equipment, change dehydrator filter pressurize with nitro to look for losses, then emptied and then gas charge. if it is blends in liquid phase if it is pure as you like liquid or gaseous. luck!