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A.  DETERMINE THE SYSTEM LOCATION

 

The system should be located under a sink. 

 

The exact placement 

of the various components will vary from installation to installation.  

You must decide where to install the faucet, tank and filtration 

assembly by balancing convenience with ease of installation and 

servicing.  (See Fig. 1).

B.  PREPARE THE AREA FOR INSTALLATION

 

Inspect the cold water supply line and determine if any special 

fittings, in addition to what is included in the kit, are required.

IMPORTANT NOTE:

It is a good idea at this time to check the condition of the undercounter 

plumbing for any existing or potential leaks. Make sure to perform any 

necessary repairs prior to the installation of the drinking water system.

I. Installation Instructions

Drain

Saddle

Sink Drain

Storage Tank

Filtration System

1/4" Orange

Tubing

Storage Tank

Valve

Red SFC Tubing

1/4" Green

Tubing

3/8" Black

Tubing

Feedwater

Connection

Placement

3/8" Blue

Tubing

3/8" Yellow

Tubing

Fig. 1

C.   DETERMINE FAUCET MOUNTING LOCATION

 

If the sink already has a hole provided that can accommodate the 

RO faucet, then no drilling is required.  Additionally, a sprayer may be 

disconnected to provide a suitable mounting hole for the RO faucet.  A 

pipe cap or plug will 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 cabinet construction.

 

If drilling a hole in your sink is required, the professional installer 

should follow the instructions below.

D.   MAKE THE FAUCET MOUNTING HOLE

Drilling 7/8” diameter hole through countertop or stainless steel sink:

1.  Locate area to be drilled.  Mark center of hole with center punch.

2.  Drill hole with 7/8” drill bit suitable for countertop materials or cast 

iron/stainless steel.

3.  With grinding wheel or file, smooth out any rough edges.

To reduce the risk of eye injury while drilling countertop for faucet 

installations:

  • 

Safety glasses 

MUST

 be worn during the sink hole drilling operations.

CAUTION

  • 

The drinking water system faucet should be located on a flat surface, 

conveniently located near the sink, so that it empties into the sink.  

Most sinks have pre-drilled holes designated for sprayers, soap 

dispensers, and other accessories.  If your sink does not have an 

extra hole, 

we highly recommend professional installation.

  • 

Porcelain, enamel, and ceramic sinks require special procedures for 

drilling holes.  

Professional installation is highly recommended.

IMPORTANT NOTES

5

(FLOOR)

Faucet without

Air Gap

3/8” Blue 

Tubing*

For refrigera-

tor icemaker or 

water dispenser 

hookup, tee into 

tubing

Faucet Adapter

Cold Water 

Supply Pipe

3/8” Yellow 

Tubing*

Storage

Tank**

black tubing with

the optional connection

to a basement floor drain

Air Gap Device

(e.g. Gap-A-Flow,

not included)

Laundry Sink, 

Standpipe or 

Floor Drain

(Basement

 Floor)

Storage Tank

Valve

Red SFC Tubing

Filtration 

system

* For best flow, keep the tubing as short as possible

** Mount the storage tank on a shelf or strap it between two floor joists

1/4” Orange 

Tubing

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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