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drains, consult your professional installer for special drain saddles.
 

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: ...ion and Operating Instructions For 3MRO401 Reverse Osmosis Drinking Water Filtration System Installer Please leave manual with homeowner Homeowner Please retain for operation and future maintenance instructions ...

Page 2: ...ated with ingestion of contaminants Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system Systems certified for cyst reduction may be used on disinfected water that may contain filter able cysts EPA Establishment 070595 CT 001 To reduce the risk associated with a hazardous voltage due to an installer drilling through e...

Page 3: ...dition Where a backflow prevention device is installed on a water system a device for controlling pressure due to ther mal expansion must be installed Do not use a torch or other high temperature sources near filter system replacement filters plastic fittings or plastic plumbing On plastic fittings never use pipe sealant or pipe dope Use PTFE thread tape only pipe dope properties may dete riorate ...

Page 4: ... Prepare the system for installation 6 G Install the feed water connection and tubing 7 H Prefill and sanitize the storage tank 7 I Install the drain connection 7 J Install the filtration assembly and storage tank 8 K Make the tube connections 8 L Start up the system 8 M Flush the system and check the operation 8 N Installation troubleshooting 9 II Operation Maintenance Instructions A Important wa...

Page 5: ... be required to seal the connection If drilling is required we strongly recommend you contact a professional installer The faucet should be positioned so that it empties into the sink and the spout swivels freely for convenience Before drilling the hole always check underneath the sink to ensure that nothing will interfere with mounting the faucet such as reinforcing ribs support brackets or the c...

Page 6: ...faucet spout into where the 3 8 tubing was just removed 3 Slide the chrome base plate and rubber washer up the threaded base of faucet 4 Connect the 1 4 green tubing supplied in the installation kit to the smaller barb on the air gap faucet Push it on firmly until it seats 5 Connect the supplied 3 8 black tubing to the larger barb on the air gap faucet Push it on firmly until it seats 6 From above...

Page 7: ...ld water supply making sure the tank valve is still open and allow the tank to fill about 3 minutes 5 Close the cold water supply 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 the tank for at least 15 minutes Refer to the Using Push In Fittings sec...

Page 8: ... 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 ...

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 fitting to verify that the hole is drilled through completely Shorten tubing so that it is as vertical as possible Blow air into the air gap outlet using a short length of tubing Disconnect the red ...

Page 10: ...e 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 from the head Firmly pull the filter from the head It may be necessary to twist the filter slightly from side to side to help free it 4 Remove the new replacement filter from its protective wrap Double check to see t...

Page 11: ...d 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 servicing or routine maintenance which involves the RO membrane module carbon block post filter storage tank or faucet When to Sanitize the Filtration System After any servicing or routine maintenance which in...

Page 12: ...g the warranty period 3M Purification 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 exclusive obligation This warranty gives you specific legal rights and you may have other rights which may vary from state to state or country to country For any warranty q...

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