abc SG2 Operation And Maintenance Manual - Page 3

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RO Filter

Ensure the system is unpressurized by fully opening

the bypass valve and the RO only valve. Failure to do

so could result in injury as the pressure is released or

create a vacuum that will hold the old RO membrane

in place. Remove the yellow wedge piece from the top

of the RO housing with a phillip's screwdriver, then

remove the white retaining ring by pulling it out of the

groove around the inside of the housing. Remove the

black cap from the top of the filter housing using the

"T" wrench. Insert the wrench into the threads on the

top of the housing and lift up to remove the cap. There

is an o-ring underneath the black cap, remove and

inspect this for any cracks or signs of wear. Replace if

necessary (part number FW7000-COR). Using a pair

of needle nosed pliers, remove the old RO membrane

from the housing by lifting it up. Apply a small amount

of Molykote 111, or similar silicone grease, to the top

and bottom protrusions on the new RO membrane.

Also apply Molykote 111 to the white rubber sealing

ring on the new membrane - this white ring will be on

the upper end of the filter when it is properly installed

in the housing. Insert the new RO membrane into the

housing by pushing it down and into the o-rings on the

bottom of the assembly. Coat the o-ring with molykote

and insert into shelf on the top of the RO housing.

Insert the black cap on the top of the housing by

pushing it down below the retaining groove. Insert the

white retaining ring in the retaining groove. Ensure the

white retaining ring is properly seated and reinstall

the yellow retaining wedge. Both of these keep your

pressure vessel top from shooting off.

4. Hooking Up To Water Source

Your SG2 is designed to be operated while standing up.

Locate an external water source. Attach one end of the

feed hose (not supplied) to the water source. ¾" garden

hose is preferred. Open the faucet at the building

and make sure all air is out of your source hose. Turn

off water and attach to the female connection on the

Carbon/Sediment filter. Turn water back on fully and

adjust bypass valve to desired flow rate.

5. Bypass Valve Operation

The system comes with a Bypass/Pressure Regulator

valve. The bypass valve is the primary way you can

control the pressure of your system. It also controls

the amount of water that your RO membranes lose

as bypass discharge during normal operation. There

should always be water flowing out of the bypass

valve. Opening the bypass valve more will reduce the

amount of pressure that is used to produce pure water,

resulting in lower flow rates at the brush. Closing the

bypass valve will increase the amount of pressure

which can lead to higher flow rates at the brush, but

can diminish the life of the filter. RO membrane filters

use the bypass flow to remove concentrated dissolved

solids from the filter. Operating the system with the

bypass open (until the bypass flow is approximately

the same as the pure water flow) is one of the best

ways to ensure maximum life from the RO membrane

filters. Closing your valve so that the flow of the bypass

is roughly equal to the flow of pure water is a good

place to start. This will restrict flow for elevated system

pressure, but also allows some brine to exit your

membranes. It is recommended that you run your

system with the bypass valve fully open for a few

minutes each time you finish using your system to

help clean out your RO membranes and help extend

their life.

SG2 Pure Water System Operation and Maintenance Manual - 3