Quote:
Originally Posted by SuperD
Will using compressed air to clear the water lines leave a little, absolutely yes! There will not be enough in the lines to cause damage if it freezes. For freezing to cause damage the water has to be confined in such a way that it has nowhere to go when it expands. A line that has been blown out with air has plenty of dead space to expand and what little water that is left will not cause any damage.
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After blowing the lines, I let things sit for 5-10 minutes and blow them again. I usually get one last slug from some of the lines. You can't count on the lines not having a small pocket or two in the longer runs that run across the floor. The second blow out will make sure there isn't enough water left in the lines to matter. Even if you have a small pocket with water in it, its not going to rupture the line when it freezes as long as the line is otherwise empty.
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