Cartridge Replacement; Replacement; Reverse Osmosis Cartridge Replacement; Flow Control And Screen - GE PNRV18ZBB01 Owner's Manual

Care and cleaning of the reverse osmosis system.
Postfilter Cartridge Replacement
Green protective cap
Continuing from Prefilter Replacement Procedure
Vacuum (water supply valve closed, RO water faucet opened
relief
and system drained):
valve
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2

Reverse Osmosis Cartridge Replacement

NOTE: When replacing the Reverse Osmosis
cartridge, also install a new flow control and screen.
It's time to replace the Reverse Osmosis cartridge
when the amber "RO" light on the faucet base
flashes continually while Reverse Osmosis water is
taken from the faucet.
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2
NOTE: Be sure the bottom end of the prefilter is at the
bottom, and the UP arrow on the Reverse Osmosis
cartridge points upward (o-ring seal end downward).

Flow Control and Screen

The flow control regulates the flow of water through
Cone
the Reverse Osmosis cartridge at the required rate
Flow
screen
so high quality product water is produced.
control
When servicing the Reverse Osmosis system,
check the flow control and tubing to it, to make
sure the tube and surrounding surfaces are clean
Reverse
and unrestricted. A small, cone-shaped screen is
Osmosis
cap
located in front of the flow control to help keep it
clean. If the flow control is plugged with foreign
particles, the Reverse Osmosis cartridge cannot
discharge minerals and impurities to the drain. If
this happens, it will only take a short time for the
cartridge to plug, making it useless.
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2
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Disconnect tubing at both ends of the postfilter.
Be careful, water in tubing may spill. See
illustration, page 9.
Pull the filter from the holder and remove
fittings from both ends.
Follow steps 1 through 7 in the Prefilter
Cartridge Replacement section.
Slide the new Reverse Osmosis cartridge into
the top of the prefilter cartridge. Then, place
the assembled cartridges into the Reverse
Osmosis housing.
Make sure the red tank shutoff valve is closed,
water supply valve is closed (turn clockwise),
and the RO water faucet is open to the system.
Drain system until water stops flowing.
Locate the flow control and screen. Remove
the straight tubing from the top of the Reverse
Osmosis system, marked "Drain."
Remove the flow control from the end of the
tubing with a clean knife edge. Remove the
screen; a toothpick may be needed for the
interior portion of the cap.
Remove the green protective cap and depress
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the vacuum relief valve stem, allowing air to
enter the tank. Release the valve stem AFTER
flow from the tank shutoff slows to a slight
drip. Replace the green protective cap.
WARNING: This valve stem is for vacuum relief
only. Pressurizing the tank may cause it to
rupture. Do not attempt to pressurize the tank .
Replace filter into the holder and reconnect
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the tubing at both ends.
NOTE: Be sure the flow arrow points downward.
Remove and replace the flow control and screen.
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See the Flow Control and Screen section below.
Lightly lubricate the cap o-ring seal with only
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clean silicone grease. Then, push the cap into
position and install the clamp sections and
retainers.
Turn on the water supply valve and PURGE THE
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REVERSE OSMOSIS CARTRIDGE. See the Purging
the Reverse Osmosis System section.
CAUTION: The Reverse Osmosis cartridge contains
a food grade preservative that should be purged
from the system before first use or whenever the
Reverse Osmosis cartridge is replaced. The
preservative will give product water an unpleasant
taste and odor.
If you are replacing the flow control and screen,
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discard them. If you are checking the flow
control, screen and tubing for blockage, clean
these parts of any debris. Do not blow through
the flow control. It will contaminate the part.
Replace the screen by placing the cone end
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into the elbow cap and carefully push it in.
CAUTION: Do not force in further after you feel
resistance. Visually check to be sure it is
properly positioned.
Install the flow control and tighten by hand,
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then another 1/4 turn with pliers. DO NOT
OVERTIGHTEN AND DISTORT OR CRUSH THE
TUBING AND FLOW CONTROL.
If you are replacing the Reverse Osmosis
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cartridge, return to the Reverse Osmosis
Cartridge Replacement instructions. Otherwise,
open red tank shutoff valve and water supply
valve (turn counterclockwise). Close the RO
water faucet.