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G.   INSTALL THE FEED WATER CONNECTION AND TUBING 

1)  Open faucet and turn off cold water supply to relieve pressure. 
2)  Locate the cold water stem on the underside of the faucet fixture. 

Unscrew the cold water feed tube from the faucet stem. Locate the 
Faucet Adapter that came with your drinking water system. Insert 
the black gasket into the threaded adapter and tighten onto the 
Faucet Cold Water Stem under the sink, making sure that 1/4” side 
connection is accessible and not facing the wall. Make sure not to 
overtighten.

3)  Take the Cold Water Feed Tube and attach to the Faucet Adapter, 

making sure not to over tighten.

4)  Locate the 1/4” Orange Tubing and insert into the 1/4” outlet of 

Faucet Adapter.  See Figure 3 and “Using Push-in Fittings” below.

5)  Leave cold water supply off. 

H.   PREFILL AND SANITIZE THE STORAGE TANK

 

Prefilling the storage tank is always recommended so that there is 

pressure to check for leaks as well as sufficient water to flush the carbon 
block post-filter. The RO Drinking Water System 

substitutes the granules 

with a half teaspoon of common unscented household bleach.

 (Refer to 

page 2 for additional information.) It is important to use a sanitizer when 
prefilling the tank so the solution can sanitize the tubing, fittings, and the 
faucet at start up.

1) 

Remove protective cover from storage tank and discard.  Using an 

eye dropper, dispense 2 drops of ordinary household bleach into the 
end of the tank. Apply PTFE tape (not included) to threaded tank 
connection and install tank valve onto connection. 

Do not over 

tighten. 

Open the tank valve so that the tank valve handle is parallel 

to the valve body. 

2)

  Connect one end of the 3/8” yellow tubing into quick connect tank 

valve. Connect the other end of the 3/8” yellow tubing to the 3/8” x 
1/4” union connector included in the tank sanitization kit.

3)

  Connect the free end of the 1/4” orange feedwater tubing to the other 

end of the 3/8” x 1/4” union connector.

4)

  Open the cold 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” 
section.

NOTE: 

 If you encounter 

difficulty in removing 
the tubing from the 
3/8” x 1/4” union 
connector, make sure 
the tank valve is closed 
and cut the yellow 
tubing approximately 
1” away from the tank 
valve fitting to relieve 
the pressure.  Remove 
the 1” piece from the 
tank fitting.

IMPORTANT: 

 After the 

installation is complete, 
it is recommended that 
the 3/8” x 1/4” union 
connector be saved 
for future use in tank 
sanitization.

I. INSTALL 
THE DRAIN 
CONNECTION

IMPORTANT: 

 

Before starting this procedure, inspect the condition of the drain 
piping, especially in older homes where the traps and tailpieces can be 
deceptively thin and frail.  If they are in poor condition, replace prior to 
installing the drain connection.

IMPORTANT:  Some local plumbing codes may prohibit the use of 
saddle-type drain connections.  

Undercounter Installation:

 

The drain saddle assembly is designed to fit around a standard 

1-1/2” OD drain pipe.  For smaller (lavatory type) or larger (ABS pipe) 

MOUNT

HERE

NEVER

MOUNT

HERE

GARBAGE

DISPOSAL

Fig. 4

7

Vertical Position

Horizontal Position

Nut

Screw

Drain Saddle
Elbow

IMPORTANT:
Hole should be located on
top of the pipe if drain saddle
is positioned horizontally.

Drain Saddle

Halves

Fig. 5

Fig. 3

1/4” Orange 
Tubing

Faucet Stem

Undersink

Faucet Adapter

Cold Water
Feed Tube

Collet

Backstop

“Using Push-In Fittings”

CAUTION

To Attach Tubing

Push tubing in as far as 
it will go. Tubing must 
be inserted past o-ring 
and hit backstop. Pull 
tube to ensure it is 
secured.

To Release Tubing

Push in grey collet to 
release tubing. With 
collet held, pull tubing 
straight out. 

To reduce the risk associated with property damage due to 
water leakage:
  •  Ensure all tubing and fi ttings are secure and free of leaks.

Correct

Incorrect

Cut Tubing Straight

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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