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The filtration system is designed to require very little
maintenance. To ensure that the water is of the highest
quality, occasionally some service is required.
Checking the Timer Program
During normal operation, the system displays the time
setting for the Flush Interval Mode () and the deci-
mal will flash in one second intervals. This is the time
between flushing, not a time of day setting.
Over time, it is possible that the time that the system
flushes occurs at a time of high water use. If this cre-
ates a problem, the timer can be reset by unplugging
the power cord, waiting for 5 seconds, and plugging the
power cord in again. The timer then begins timing from
the point power is restored to the system. Follow the
procedures within the Operation section of this manual
to check and set the timer settings.
Changing the Cartridges
While the filtration system is designed for long life,
eventually the cartridges will need to be replaced.
NOTE: Do NOT operate the system without the Flow
Regulator Assembly or the unit will be damaged,
physical injury may occur, and the warranty will be
voided.
1. Open the faucet or tap closest downstream to the
filtration system.
2. Close the inlet water valve and allow the system
to depressurize.
3. Place a bucket under the "T" or cross fitting at the
inlet connection to the system. Open the valve or
unscrew the cap to drain the system.
4. Press and hold the Start button to help drain the
system.
5. Close the inlet drain valve or reattach the cap on
the "T" fitting when the water flow stops.
Figure 14. Manual Flush
P/N 1010873 Rev. C 05/05
UFL-420/440 WATER FILTRATION SYSTEM
MAINTENANCE
FL
PROGRAM
6. Unplug the system.
7. Make sure there is enough room below the
housing to remove the cartridge.
8. Remove the snap ring on the end of the housing.
Grab the raised lug with your fingers or a pair of
pliers and pull towards the center of the end cap
and away. The ring should lift out of its groove.
9. The end cap, end cap O-ring, and cartridge
should easily drop down out of the housing. If
not, pull gently on the end cap to remove.
10. Inspect the cartridge O-rings and end cap O-ring
for nicks or cuts. Replace as needed.
11. Lubricate all O-rings with a food-grade silicone
lubricant. Apply a light coating of lubricant to the
inside center tube at both ends of the new car-
tridge..
12. Place the end cap O-ring on the end cap and
insert the end cap into the end of the new car-
tridge. Position the new cartridge and end cap
below the housing and gently insert into the hous-
ing. Press the end cap into position until the end
cap is fully seated and the snap ring groove is
visible.
13. Install the snap ring by guiding the non-lugged
end into the groove first, pushing outward and
working around the ring until it snaps into place.
NOTE: Make sure that the snap ring is fully seated
before turning the water on.
14. Follow the Flushing and Starting the System and
Sanitizing the System and Lines procedures in the
Installation section of this manual to complete the
cartridge change.
If the cartridge does not easily come out of the housing,
the opposite end cap can also be removed for assis-
tance during Step 8. Remember to inspect and reinstall
the O-rings at each end in the proper order.
System Sanitization
Over time and use, the plumbing downstream from the
system may require sanitization. It is recommended
that the system and downstream plumbing be sani-
tized at least once a year. When necessary, follow
the Sanitizing the System and Lines procedure in the
Installation section of this manual.
15
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