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Operation And
Maintenance

I. Important Water Quality Assurance
Requirements

Reverse Osmosis drinking water appliances contain
treatment components that are critical for effective
reduction of Total Dissolved Solids as well as inor-
ganic chemical contaminants.  Water Factory
Systems strongly recommends that the user test the
water periodically (every six months minimum) to
verify that the system is performing satisfactorily.
Some models have a Percent Rejection (PR) Water
Quality Monitor to provide the user with a means to
test the water at any time.  If a PR Monitor is not
used, your dealer may offer a bi-annual water test-
ing service.  Routine maintenance is necessary in
the form of prefilter, postfilter, and membrane
replacement, based on the following guidelines:

A)

Sediment Prefilter, Carbon Prefilter, or    

Sediment/Carbon Prefilter, optional Prolonged  
Contact Filter (PCF Models), and Carbon   

Postfilters - Change every six months to one year  

depending on feedwater quality.

B)

Membrane -  Change as required based on:
• Built in Percent Rejection Water Quality Monitor   

(PR Models only).

• A bi-annual testing service may be offered from  

your dealer if a monitor is not used.

NOTE:

Recommended maximum membrane  

service life is 36 months.

II. Replacing Filter Cartridges

The life of prefilter cartridges generally depends on
local water conditions (i.e., dirt, rust and/or chlorine
levels) while the life of post filters is generally deter-
mined by the length of service.

When To Replace Sediment Prefilter

A)

Every six months to one year.  Check cartridge   

after six months.  If discoloration is observed on   
inside core or a layer of sediment is deposited on   
the outside surface, then the cartridge should be   

replaced.  Otherwise, replace cartridge yearly.

B

) As a rule, private wells require more frequent     

sediment prefilter changes while softened feed 

water usually requires only yearly replacement.

C)

Recommended maximum sediment prefilter service

life is one year.

When To Replace Carbon Prefilter
(4500 and 5000 Series Only)

The carbon prefilter removes free chlorine from the
feedwater supply to protect the TFCM membrane from
chlorine attack.  To find out the chlorine level in a
water supply, the water should be tested for free chlo-
rine or call the public water supplier.

A)

With free chlorine levels up to 1mg/L, the carbon   

prefilter should be changed every year.

B)

With free chlorine levels exceeding 1 mg/L, the car-  
bon prefilter should be changed every six months.

When To Replace Carbon Postfilter

A)

If the filter is being used to control tastes and  

odors, replace every year.

B)

If the filter is being used to meet standards for chlo 
ramines, change every six months.

C)

If the filter is being used to meet standards for a  
regulated organic chemical contaminant, then  
replacement should be based on a monitoring 
program established with a public health agency.

How To Replace Prefilter And Postfilter Cartridges 

Replacement of filter cartridges generally requires:

• New replacement cartridges

• Water Factory filter wrench or equivalent

• Replacement O-rings for filter housing(s)
• Cleaning brush (optional)
• Sanitizing supplies  (See Section IV)
• Cloth or sponge to clean up any spillage
• Removal of the purification assembly from its location

A)

Open faucet to drain tank and turn off feed water.  
Wait five minutes for purification assembly to   

depressurize.

B)

Using filter wrench, unscrew the filter bowl, coun-  

terclockwise viewed from the bottom.

C)

Discard water in bowl and the used filter car  

tridge. Set O-ring(s) aside.

D)

Scrub inside filter bowl with a brush using hot   

water and a mild detergent.  Rinse thoroughly.

E)

Insert new filter replacement cartridge and follow 

instructions for sanitizing the purification assem- 
bly. Replace O-ring(s) if necessary.  Note:  O- 

rings should be lubricated before putting into   

service using a food grade silicone lubricant or glycerin.

F) 

Attach filter bowls to proper purification assembly   

head(s).

13

Summary of Contents for N4000 Series

Page 1: ...allation Operation and Maintenance Manual WATER FACTORY SYSTEMS N4000 N4500 N5000 Reverse Osmosis RO Drinking Water Appliance CUNO Incorporated 400 Research Parkway Meriden CT 06450 Tele 203 237 5541...

Page 2: ...nside Make sure to flush it thoroughly as directed before first use Table Of Contents Installation Instructions A Determine the appliance location B Prepare the area for installation C Prepare the app...

Page 3: ...and remove compo nents Check that all installation parts are present which includes the purification assembly storage tank faucet installation hardware and tubing Check that the air supply in the empt...

Page 4: ...the condition of the drain piping espe cially in older homes where the traps and tail pieces can be deceptively thin and frail If in poor condition it is wise to inform the customer that the conditio...

Page 5: ...air gap module Plumber s putty It is important to understand what is involved in this procedure First the glassy layer of porcelain must be penetrated through to the base metal Second a center disc o...

Page 6: ...usually mounted to the right or left sink cabinet sidewall taking into consideration the space available and the tank loca tion Generally the tank is placed in the rear of the sink cabinet while the...

Page 7: ...faucet until a steady stream of water flows Close faucet wait at least 5 minutes and carefully check for leaks Correct as necessary NOTE When the system is first turned on water may intermittently sp...

Page 8: ...er and hex nut onto the threaded nipple Hand tighten hex nut until faucet feels snug E After rechecking faucet orientation tighten hex nut 9 16 wrench or deep socket until faucet feels secure NOTE Fla...

Page 9: ...ion and slide faucet handle forward over spout hole to gain access to faucet valve Unscrew the tee bar and slotted bushing to remove valve Clean out obstruction or replace with new valve mechanism as...

Page 10: ...pipe farther from Properly plug original hole Caution Make sure drain saddle is always installed above before the the trap Fig 4 10 General Basement Installation Schematic Fig 2 Faucet with Air Gap 1...

Page 11: ...n Saddle Elbow Drain Saddle Mount drain saddle at either location Hole should be located on top of the pipe NOTE Some state and local plumbing codes may prohibit the use of saddle type valves and or d...

Page 12: ...tubing selected for use with these connectors be of high quality exact size and roundness and with no surface nicks or scratches If it is necessary to cut the tubing use a plastic tubing cutter or sh...

Page 13: ...only yearly replacement C Recommended maximum sediment prefilter service life is one year When To Replace Carbon Prefilter 4500 and 5000 Series Only The carbon prefilter removes free chlorine from th...

Page 14: ...low sanitizing and start up procedures for the storage tank and purification assembly outlined in Section IV IV RO Appliance Sanitization To assure the highest quality water from your Water Factor RO...

Page 15: ...he Purification Assembly Sanitizing the purification assembly generally requires New prefilter cartridge s and filter housing O ring s Water Factory filter wrench or equivalent Common household bleach...

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