Hello Walter, my healthy advice would be to leave it that way, if at a temperature of -17 degrees Celsius, it is enough to freeze what you need and just view, insulate or line the pipe with almaflex, or some similar insulating material , to avoid the exchange of heat that is not maintained with frost or condensing annoying drops of water, falling to the floor or on some electrical part such as the relay itself for example. If your freezer, has up to 20 centimeters of frost outside the furniture in the return pipe, it means that the system already has all the refrigerant it needs, so observe internally, that it does not see the pipes of the half down so frozen , it is completely normal, because it is only a phenomenon that can be observed, because the pipes below do not receive heat exchange with the outside atmosphere, which the pipes above do so because they receive all the heat more directly from the outside environment when opening the freezer door, that is why the pipes closer to the door make more frost than those below. If the capillary continues to increase, the final result would be worse, because as the capillary increases, it also strangles the expansion element more, in this case he capillary and as a result, he will receive an even more negative pressure than he already has, this It can also be fatal for the compressor itself. Increasing the return would be more acceptable, but it would be useful if the pipe remained inside the equipment, to increase the heat exchange and not outside the furniture, unless I used it as a liquid trap, which also for me when making a freezer, I prefer that stays inside the furniture, for greater heat absorption. Luck. S @ lu2 friovega63.