6
Step 4: Drain Line Connection
The 3/8” OD Red Polyethylene tube from the
WM is for connecting to a drain.
If 3/8” red tubing of the WM is to be installed to
a drainpipe under a sink, an air gap device may
be required by plumbing codes.
Drain Saddle Connection
1. 3/8” OD Red Polyethylene tube is for
connecting to a drain.
2. Locate vertical drainpipe under a sink before
the p-trap.
3. Drill ¼” hole into the drainpipe that faces
the direction of WM.
4. Peel the protective film off the sponge
gasket and apply to the inside of drain
saddle, using care, to align sponge gasket
with drain saddle port.
5. Align the drain saddle with the ¼ inch hole
on the drainpipe using a drill bit or screw
driver and tighten drain saddle into place.
6. Connect the 3/8” red tubing from the WM to
the drain saddle. Make sure the 3/8”
tubing is as straight as possible.
7. When using an air gap device there can not
be any loops or dips below the connection to
the saddle drain.
Figure 4b is shown with an air gap
Floor Drain Connection
If connecting to a floor drain, install according to
local plumbing codes.
Step 5: RO Water Connection
The WM-120-PT requires a pressurized
storage tank for proper operation. Most
pressurized storage tanks have an air
pressure setting over 20 psi from tank
manufacturer. This pressure must be
reduced. The air pressure setting in a
pressurized storage tank should be checked
and set between 7 to 10 psi (when the tank is
empty of water) for correct operation of the
WM-120-PT.
The ¼” blue plastic tubing is the line the RO
water flows through from the WM-120. The ¼”
blue tubing connects to a pressurized storage
tank or post-treatment equipment depending on
the application.
NOTE: Adding ball valve before and after the
pressurized storage tank will be helpful for ease
of future maintenance.
Start-up
(a) Disconnect the ¼” blue tubing from the
pressurized storage tank or from the post-
treatment equipment that it is connected.
(b) Make sure all ball valves on the WM are in
the closed position.
(c) Open the ball valve at the flush line
connection, making sure that the ¼” black
flush line is in a pail, sink or drain. Water
will come out the tubing during start up.
(d) Turn on the incoming feed water supply to
WM and check for leaks.
(e) Open the inlet ball valve to the WM allow
air and water to purge out the flush line for
at least 5 minutes or until water run clear.
Close the ball valve on the flush line and
check for leaks.
(f) Open the ball valve feeding into the WM-
membranes. Within 2 - 5 minutes RO water
will start flowing out of the ¼” blue tubing.
Allow water to flow to a drain or into a pail
for 10 minutes and check TDS reading. Best
production is normally achieved in 30 days
3/8” Red TUBING
DRAIN PIPE
DRAIN
SADDLE
Wrong No Loops
Wrong No Dips
Air Gap Device
Floor Drain
2” Air Gap
