What is your views on line sets? How many bends can there be and is there a right and wrong way to bend these copper lines. My particular set up has four bends from the outdoor unit until it gets to the evaporator inside the fan coil. These bends were done by hand and not done by mandrel like on auto custom exhaust systems, so not to restrict flow. When my system is running I can hear the 410A kind of like whistling in the line sets. Is this normal, or is there too much restriction there?

thorton, with thanks