US Water Systems Fusion Owner's Manual page 12

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11. Install the drain line on the 3/4" threaded elbow. This can be a 3/4" solid pipe conveyed
to a floor drain, sink drain or stand pipe or the hose barb fitting can be used to install 1/2"
drain tubing. An air gap should be established if the local code requires it. Drain line
larger than 3/4" is acceptable. The system will drain with pressure, so the drain line can
be ran vertically for up to 5'. If the drain line is ran vertically then along the wall horizon-
tally, make sure the horizontal pipe/tubing has a drop to the final drain point (1" drop per
10' of linear run). The system should be plumbed with the least amount of back pressure
on the drain line.
12. The drain elbow can be removed by removing the red clip and pulling the elbow out of
the valve. This will make it easer to connect the plumbing fitting used. BE CAREFUL
not to cross thread the fitting on the elbow. There is a small thread tolerance for this fit-
ting to help reduce the potential for a leak so it can be cross threaded easily.
NOTE: It may be necessary to install a 3/4" drain line on a linear stretch of drain line
that exceeds 15'.
Installation, Operation and Maintenance Manual