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How Your Reverse Osmosis System Works - Kenmore 625.3847 Owner's Manual

Reverse osmosis drinking water system
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- HOW YOUR REVERSE OSMOSIS SYSTEM WORKS -
PREFILTER
Water
from
the cold
supply
pipe
enters
the RO as-
sembly
prefilter
first (FIG. 8 and schematic
below).
The prefilter
has
a replaceable
sediment
cartridge
with
activated
carbon
in its composition.
The car-
tridge
(10 micron)
removes
sand,
silt, dirt, other sedi-
ments,
and up to the ppm
of chlorine
shown
in the
specifications
from the feed water.
Chlorine
will de-
stroy
the RO membrane.
Filtered,
clean,
chlorine-
free water
flows
from
the prefilter,
to the RO mem-
brane
cartridge.
IMPORTANT...
See pref!lter
maintenance,
page 11.
REVERSE
OSMOSIS
(RO) CARTRIDGE
The cartridge
inside
of the RO housing
is a tightly
wound
special
membrane.
The membrane
removes
the dissolved
solids
and organic
matter
when
water
is forced
through
the cartridge.
High quality
product
water
(about
I ounce
per minute)
exits the RO hous-
ing and goes
to the storage
tank
or to the postfilter
and RO faucet.
Reject water,
with the dissolved
sol-
ids and
organic
matter,
is routed
through
the flow
control
and
to the drain.
STORAGE
TANK
The storage
tank
holds
up to 2.3 gallons
of product
water.
A diaphragm
inside
the
tank
keeps
water
pressurized
to about
30 psi, when
the tank is full, to
provide
fast flow from the RO faucet.
The tank
when
empty,
is pressurized
to 5 - 7 psi.
POST FILTER
After leaving
the storage
tank
but before going
to the
RO faucet,
product
water
goes through
the post filter.
The post
filter is an activated
carbon
type
filter. Any
remaining
tastes
and
odors
are removed
from
the
product
water.
Taste-free,
odor-free,
clean,
high
quality
drinking
water
is available
for use.
FAUCET
The sink or countertop
faucet
has a hand
operated,
spring-loaded
closed lever
to prevent
the waste
of
drinking
water.
You can also keep the faucet
open by
pushing
upward
on the lever and locking
it against
the faucet
spout.
To comply
with plumbing
codes,
an air- gap is built
into the faucet
drain
water
connection.
SHUTOFF
ASSEMBLY
To conserve
water,
the drinking
water system
has an
automatic
shutoff
system.
When
the storage
tank has
filled
to capacity,
and the drinking
water
faucet
is
closed,
pressure
closes
the shutoff
to stop
flow into
the RO. Pressure
in the storage
tank
is about
half of
the water
supply
pressure.
After
drinking
water
is
used,
and pressure
in the system
drops,
the shutoff
opens
to allow
water
flow again.
CHECK VALVE
A check valve
(FIG. 10) is located in the outlet
end of
the RO housing,
opposite
of the cap. The check valve
prevents
a backward
flow of product
water
from the
storage
tank.
A backward
flow could rupture
the RO
membrane.
FLOW CONTROL
Water
flow through
the RO membrane
is regulated
by the flow control.
It maintains
the desired
flow rate
to obtain
the highest
quality
drinking
water.
The
flow controlis
located
in the end of the 1 / 4" red drain
tubing,
at the RO housing
drain
port. A small
cone-
shaped
screen
fits over the end of the flow control
to
help prevent
plugging
with drain
water
sediments.
gravity
drain
PRODUCT
WATER
FAUCET
,,la=_l,,.
YELLOW
'1
BLUE
_
PRODUCT WATER
WATER
GREEN
IN
1
.
REVERSE
OSMOSIS
II./1' d_a,_nt_oOlW
SCHEMATIC
,,ele
rl]_ _'w
RO MEMBRANE
[ l&l &t
'
'*,I
_
&
.q.._
.,__.
.__._
check
I_I:___ " ;_
f
f
_
valve_._O
_= -
-- _.--
-- _t=--
-- --
l,_p
AUTOMATIC [_
,,,,e=
SHUTOFF
[_
REFILT:
I
10

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