Maintenance - North Star NSRO42C4 Installation And Operation Manual

PREFILTER / POSTFILTER MAINTENANCE
NOTE: It is recommended to replace the battery,
prefilter and postfilter cartridges at least every 6
months of product water use. Replace more often
if they begin to plug with sediment.
The prefilter and postfilter are replaceable sediment
cartridges with activated carbon in their composition.
See Fig. 28. You must periodically replace the prefilter
and postfilter cartridge. This will protect the RO mem-
brane from being destroyed by chlorine. It will also pre-
vent the filters from plugging with sediment.
You may notice a slower output of product water as
the prefilter and postfilter build up with sediment.
Replace the prefilter and postfilter cartridges when this
occurs. You should replace the battery whenever you
replace the cartridges.
RO MEMBRANE CARTRIDGE MAINTENANCE
The Reverse Osmosis cartridge is a tightly wound spe-
cial membrane. See Fig. 28. The membrane reduces
the dissolved solids and organic matter. The life of the
Reverse Osmosis membrane cartridge depends mostly
on the pH and hardness of the supply water (see
Specifications). Cartridge life is shorter with higher pH.
For example, if supply water pH is from 6.8 to 7.7, the
cartridge may last for well over one year. However,
cartridge life may be as short as 6 months if the pH is
as high as 8.5 to 10. Higher pH weakens the cartridge
membrane and causes pin-hole leaks. It's time to
replace the Reverse Osmosis cartridge when the pro-
duction rate and/or quality of product water drops.
Product water may begin to taste different, indicating
solids and organics are passing through the Reverse
Osmosis membrane. See Reverse Osmosis cartridge
replacement.
REVERSE OSMOSIS CARTRIDGE REPLACE-
MENT
Complete the following steps to replace the cartridges.
NOTE: Do not remove manifold from mounts.
Flexing or twisting may damage the manifold.
1. Remove (turn to the left) the prefilter cartridge from
the manifold to stop flow to the Reverse Osmosis
cartridge.
2. Remove the Reverse Osmosis cartridge.
3. Remove the postfilter cartridge.
4. Discard the cartridges in a proper manner.
5. Install new cartridges in reverse order (post filter,
Reverse Osmosis and then prefilter). Turn cartridges
to the right to reattach to the filter heads. Do not
overtighten.
6. Remove and replace the timer battery. See page 12.
7. Press and hold the button on the electronics board
(PWA) until the green light begins flashing. Release
the button as soon as the light begins flashing (the
light flashes for 3 seconds and releasing the button
before or after that 3 seconds will not reset the elec-

Maintenance

Cover
Manifold
Prefilter
Cartridge
Cartridge
tronic timer).
8. Purge the Reverse Osmosis system. See page 17
for instructions.
PREFILTER / POSTFILTER CARTRIDGE
REPLACEMENT
Complete the following steps to replace the cartridges.
NOTE: Do not remove manifold from mounts.
Flexing or twisting may damage the manifold.
1. Remove the prefilter cartridge (turn to the left) from
the filter head. Then remove the postfilter cartridge.
2. Discard the cartridges in a proper manner.
3. Install new cartridges in reverse order (postfilter
first, then prefilter). Turn cartridges to the right to re-
attach to the filter heads. Do not overtighten.
4. Remove and replace the timer battery. See page 12.
5. Press and hold the button on the electronics board
(PWA) until the green light begins flashing. Release
the button as soon as the light begins flashing (the
light flashes for 3 seconds and releasing the button
before or after that 3 seconds will not reset the elec-
tronic timer).
6. Purge the Reverse Osmosis system. See page 17
for instructions.
20
RO
Turn to the left
Postfilter
Cartridge
FIG. 28
to remove