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4. Installing the Drain Clamp
NOTE: If you have a single-basin sink with a disposal unit, call Technical Support
for options.
NOTE: Before installing the drain clamp, check the drainpipes under the sink
for corrosion. Corroded pipes should be replaced before continuing with
installation.
(A) Attach the drain clamp to a vertical section of the drainpipe, about 6" above the
trap. Make sure the opening on the drain clamp is facing towards the drinking
water faucet.
(B) Using the fitting hole of the drain clamp as a guide, drill a 1/4" hole through
one side of the drainpipe.
(C) Remove the drain clamp from the drainpipe and enlarge the hole with a 3/8"
drill bit. Use a file to remove rough edges from the drilled hole.
(D) Make sure the black rubber gasket is adhered to the inside of the drain clamp
and place the drain clamp assembly over the drilled hole. Look through the
hole and position the clamp so that the center of the clamp hole is slightly
higher (about 1/16") than the center of the drilled hole. Tighten the clamp
securely.
(E) Screw the plastic compression nut onto the drain clamp until hand-tight.
5. Connecting the Faucet to the Drain
This is a gravity drain line. Any loops, kinks or sharp bends must be
CAUTION:
eliminated before proceeding. Failure to create a straight line to the
drain may result in reject water leaking through the air gap in the faucet
onto the countertop and below the faucet.
(A) Align the larger reject (3/8") tubing from the faucet with the compression nut
on the drain clamp. Create as straight and smooth a path as possible with the
tubing. Do not kink tube. Cut the tubing squarely below the nut and remove the
internal and external burrs.
(B) Loosen the compression nut two complete turns. Insert the tubing into the nut
until it stops. Tighten with fingers, then tighten 1 to 2 turns with a wrench.
6. Installation of Mounting Screws
(A) If system is being installed under the kitchen sink, locate it on back or right
wall. Make sure to allow ample space for installation. To change the filter
cartridges, a minimum of 1½" of clearance is required underneath the filter
housings. A minimum of 2" of clearance from the left side of the unit is also
required or 5" from the left bracket mounting screw hole.
(B) Install mounting screws at least 15" from cabinet floor and 7
a 5/16" space between the head of the screw and the wall to slip bracket onto
screws.
NOTE: Each connection fitting on the RO Assembly has a plug that must be
removed before inserting tubing. Push in on the collar and pull the plug
out.
7. Connecting the Faucet to the System
(A) Locate the reject tubing (reject water line) from the drinking water faucet. This
tube is the smaller of the two. Place a mark on the tubing 5/8" from the end.
Moisten the end of the tubing with water and insert tubing into the quick-
connect fitting on the flow restrictor found on the right side of system behind
the membrane.
If tubing is not firmly connected, leaking will occur. It is important for the tubing to
be inserted all the way until the mark is flush with the outer edge of the quick-
connect insert.
NOTE: Tubing may be quickly and easily removed from the fitting if necessary by
pressing the collar around the fitting then pulling the tubing with your other
hand.
(B) The faucet tube from the bottom of the threaded metal tube is inserted into the
post filter. The fitting is at the top left of the RO System. Push the free end of
the tubing into the quick connect fitting.
6 • PENTAIR RO-2550 Installation and Operating Instructions
4
5
⁄
" apart. Leave
1
2
6
2" (min.)
7
A
A
6"
B
E
D
A
3/8" Tube
5" (min.)
7
⁄
"
1
2
1
⁄
" (min.)
1
2
Port Reference
C
B
15"
(min.)
B
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