North Star NSRO42C4 Installation And Operation Manual page 21

FLOW CONTROL
The flow control is required for proper operation of the
Reverse Osmosis system. See Fig. 29. The flow control,
located inside the push-in elbow fitting on the drain port of
the system housing, keeps water flowing through the mem-
brane at the required rate. This ensures that the system pro-
duces the best quality product water.
Periodically check the flow control to be sure the small hole
through it is clean and unrestricted.
If the flow control requires service, review the exploded view
in Fig. 29. Assemble and disassemble as shown. If the flow
control remains in the manifold when the push-in elbow fit-
ting is removed, you will need to remove the drain port's col-
let and o-ring, as shown in the next section, to retrieve it.
CHANGE COLLET AND O-RING
1. Remove the collet and o-ring from the fitting with a small
screwdriver. Do not scratch the internal walls of the collet
port. See Figs. 30 & 31.
2. Clean collet port, lubricate with silicone-based lubricant,
and insert the o-ring seal into the bottom of the port. See
Figs. 30 & 31.
3. Push the collet inward until it locks in place. See Figs. 30
& 31.
Maintenance
21
Flow Control
Insert
Push-in
Elbow Fitting
1/4" Red
Tubing
To
Drain
Push o-ring seal into
bottom of port then
follow with collet.
Collet
Change Collet and O-Ring
Collet (depress to
remove tubing)
Tubing
Disconnect Tubing
FIG. 29
Fitting
O-Ring Seal
FIG. 30
FIG. 31