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The drain saddle should always be installed above (before) the trap 

and on the vertical or horizontal tailpiece.  Never install the drain saddle 

close to the outlet of a garbage disposal because plugging of the RO 

drain line may occur.  (See Fig. 4)

1)  Remove backing on foam seal and place over hole on threaded half 

of the drain saddle.  Place drain saddle at the selected location and 

mark the pipe through the threaded opening.

2)  Drill a 1/4” hole at the marked location through one side of the  

drain tailpiece.

3)  Position both halves of the drain saddle on the drain pipe so that the 

threaded opening is lined up with the hole in the drain pipe.

4)  Use  the  screws  and  nuts  to  clamp  the  drain  saddle  onto  the 

 

drain pipe.  Make sure that there is equal space between saddle  

halves on each side.  Do not overtighten (See Fig. 5).

5)  Screw in elbow and orient toward the RO faucet.

J. INSTALL THE FILTRATION ASSEMBLY AND STORAGE TANK

Undercounter Installation:

 

The filtration assembly is usually mounted to the right or the left 

side wall inside of the sink cabinet, taking into consideration the space 

available and the tank location.  Generally, the storage tank is placed in 

the rear of the sink cabinet while the filtration assembly is positioned 

toward the front for replacement filter accessibility.

 

Install screws and washers halfway, so you can easily slip the 

bracket to wall before firmly setting screws.  

NOTE:

 If you are mounting 

onto sheetrock or drywall, use anchors or screws (not included).

NOTE: It is essential that the filters be installed in the correct location.  

Use the icon coded labels to match the replacement filters with their 

corresponding filter heads.

STEP 1:  Cut open the sealed plastic bag and remove the RO membrane 

module.  

STEP 2:  Remove the white plug from the fitting at the bottom of the 

module by pushing in the small white collet and pulling out the plug 

simultaneously. See “Using Push-in Fittings” on previous page

STEP 3:  Remove the sanitary protective cap from the top of the module.

STEP 4:  Connect the red SFC reject tubing by inserting it into the fitting 

as far as it will go, located at the bottom of the RO membrane module. 

Line up the module ears (See Fig 7), insert the module and push it into 

the head until it is fully seated. Twist the module 1/4 turn to the right to 

lock it into place. The final orientation should be such that the module 

fitting is located towards the rear.

STEP 5:  Install remaining replacement filters into their respective filter 

heads using the icon coded labels, matching the replacement filters with 

their corresponding filter heads (See Fig 9).

 

To mount the filtration assembly, elevate it at least 2” (5 cm) off 

of the cabinet floor and, while keeping it level, mark the location of the 

mounting holes on the cabinet side wall.  Make small pilot holes with an 

awl or a drill and screw in the two mounting screws; leaving just enough 

protruding to allow the bracket mounting slots to slide over them.

 

NOTE: 

 If the cabinet side walls are not of solid construction, the 

filtration assembly can be set on the cabinet floor and held against the 

side wall with the mounting screws.  However, the filtration assembly 

will then need to be lifted from the mounting screws in order to remove 

the replacement filters.

 

The storage tank may be oriented either vertically or horizontally.  It is 

generally placed to the rear of the cabinet but can be set in the front 

center (between the sink basins) for ease of access if space permits.

K.  MAKE THE TUBING CONNECTIONS

 

With all of the components in place, the tubing connections can 

be made. When routing the tubing between the components, several 

guidelines should be observed.

•  Tubing runs should generally follow the contour of the cabinet 

 

rather than interfere with the cabinet storage area.

•  Strive for a neat and orderly tubing “flow” by using fasteners (e.g. 

 

insulated staples) to secure the tubing.

•  Arrange the tubing so that there are no sharp bends. Leave some 

 

“play” in the tubing for ease of servicing, then cut the tubing to the 

desired length.

•  Try to keep the tubing from the filtration assembly to the tank 

 

and faucet as short as practical for good flow.

Undercounter Installation:

 

The filtration system will use 1/4” orange, 1/4” green, 3/8” blue, 

3/8” black and 3/8” yellow tubing supplied with the system.

1) 

The 1/4” orange tubing should have already been connected to  

 the feedwater connection under Section G. Insert the other end into 

the “Feed” connection labeled on the filtration system (right side).

2) 

Attach the 1/4” x 3/8” union to 1/4” blue tubing on faucet.

3) 

Insert one end of the 3/8” blue tubing into the “Faucet” connection 

labeled on the filtration system (left side), and the other end into  

 the 1/4” x 3/8” union per Step 2.

4)

  Connect the 3/8” black tubing from the air gap faucet to the  

 drain saddle so that it slopes continuously downward without any  

 loops or low spots. Cut the tubing to the proper length and connect  

 it to the drain elbow.

5)

  Insert one end of the 3/8” yellow tubing into the “Tank” 

connection labeled on the filtration system, and the other end into  

 the tank valve.

6)

  Route the special red SFC tubing with 1/4” union connector from 

the RO membrane module to the 1/4” green tubing connected 

to the faucet. 

Do not cut this special SFC tubing.

 It’s length is 

important to maintain proper efficiency and performance.

L.  START UP THE SYSTEM

1)

  Double check to see that all of the connections are secure.

2)

  Open the cold water feed valve and check the system for 

 

 

leaks. If any leaks are detected, close the valve and correct the  

 

problem before proceeding.  

NOTE:

  If a leak occurs at a “Push In”  

 

plastic fitting, then refer to page 7, “Using Push-In Fittings”.

3)

  Lift the faucet handle and open the storage tank valve until a  

 steady 

stream of water flows.  Close the faucet, wait at least five (5)  

 

minutes and carefully check for leaks. Correct them as necessary.

M.  FLUSH THE SYSTEM AND CHECK OPERATION

1)

  With the tank valve closed (the tank should still contain the 

sanitizing solution at this point), open the faucet (set the faucet 

handle in the “up” position) and feedwater valve. Water should 

begin to drip from the faucet within several minutes. Continue 

to flush the system for 24 hours. Water will steadily drip from 

the faucet at the time. During this procedure, the tank is being 

intentionally bypassed in order to thoroughly sanitize the tank and 

also flush the membrane of any sanitizers.

2)

  After flushing for 24 hours, shut off the faucet. Open the tank valve, 

lift the faucet handle again and allow the tank to completely empty.    

When the water begins to drip steadily from the faucet the tank 

should be empty.

3)

  Close the faucet and reinspect the system for leaks. Allow the tank 

to fill completely (it will take approximately 4 hours), then drain the 

tank again. The water should be discarded because it may contain 

small amounts of sanitizer or sanitizing solution.

4)

  The system should be ready to use as soon as the tank refills.  

If any objectionable taste is noticed after the second tankful is  

drained, drain the tank the following day. 

8

Summary of Contents for 3MRO401

Page 1: ...dration Hot and cold beverages Cooking and food preparation Pet hydration Aquatic aquariums Optimized For Reduction Of Select Volatile Organic Compounds VOCs System tested and certified by NSF Interna...

Page 2: ...to small parts during the installation of this product To reduce the risk associated with ingestion of contaminants Do not use with water that is microbiologically unsafe or of unknown quality without...

Page 3: ...system Where a booster pump is installed on a water system you must install an appropriate pressure relief valve Pres sure relief valve must be maintained and inspected every 6 months Contact a plumbi...

Page 4: ...ing location 5 D Make the faucet mounting hole 5 E Mount the faucet 6 F Prepare the system for installation 6 G Install the feed water connection and tubing 7 H Prefill and sanitize the storage tank 7...

Page 5: ...nothing will interfere with mounting the faucet such as reinforcing ribs support brackets or the cabinet construction If drilling a hole in your sink is required the professional installer should foll...

Page 6: ...Gap is provided by hole 1 above faucet base 1 Familiarize yourself with all of the components shown in the air gap faucet diagram See Fig 2 2 Slide the chrome base plate and rubber washer up the thre...

Page 7: ...y and the tank valve Disconnect the orange and yellow tube from the union connector setting the tank aside while proceeding with the rest of the installation the sanitizing solution should be kept in...

Page 8: ...ween the sink basins for ease of access if space permits K MAKE THE TUBING CONNECTIONS With all of the components in place the tubing connections can be made When routing the tubing between the compon...

Page 9: ...The drain line has a loop in it Air is locked in the air gap outlet There is excessive RO reject flow Solutions Check to see that the drain line is clear of any obstruction and remove the drain saddle...

Page 10: ...ed valve Wait five 5 minutes for the filtration assembly to completely depressurize 2 Remove cover 3 Twist the existing filter 1 4 turn to the left so that the ears on the filter are able to disengage...

Page 11: ...ly and are not designed to sanitize systems that have become highly contaminated from misuse When to Sanitize the Storage Tank Upon start up as described in the beginning of this manual After any serv...

Page 12: ...tion Inc will replace the Product or refund your Product purchase price This warranty does not cover labor The remedy stated in this paragraph is Customer s sole remedy and 3M Purification Inc s exclu...

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