3M CFS5400N Installation Manual
INSTR4096 0909
Installation and
Operating Instructions
For 3M Water Filtration Products CFS5400/CFS5400N Softening Systems
Safety Instructions
• The filter system must be installed with the inlet
and outlet as labeled. Make sure not to reverse
the connections. (See markings on top of the
filter head.)
• Do not install on the hot water line. Maximum
temperature allowed is 100°F (38°C).
• Do not install on line pressure above 100 psi
(690 kPa).
• Do not use a torch or other high temperature
sources near the filter or plastic cartridge.
• Do not install near electrical wires or water
pipes which will be in the path of the drill when
selecting the position to mount the bracket.
• Do not install in direct sunlight.
• The filter system may be used with metal or
non-metallic piping systems. Any non-metallic
fittings used in the installation must be of
adequate rating for the line pressure.
• Protect from freezing. Drain the filter when
room temperature drops below 40°F (4.4°C).
• Allow minimum of 2” (5 cm) clear space
under the filter system to facilitate cartridge
changes.
• Mount the filter system in such a position as
to prevent it from being struck by other items.
• Installation must comply with existing state
and local plumbing codes.
• Do not use with water that is microbiologically
unsafe or of unknown quality without
adequate disinfection before or after the
system.
The CFS5400 system with blending capability is designed to reduce hardness caused by calcium and
magnesium minerals in point of use beverage applications such as brewed tea machines. The
CFS5400N system is designed to provide complete hardness reduction when required.
The CFS5400 & CFS5400N systems will require an external shut-off valve installed before the system. A
drain valve should be installed after the system for routine maintenance. A flush kit can be purchased
separately if a drain valve is not desired. See the 3M Water Filtration Products price list for part number
and price. The housing comes with a pressure relief valve and 1” inlet/outlet ports. 3/8” reducer
bushings, mounting bracket and wrench are supplied.
Installation Procedure
Note: Read instructions all the way through before attempting to install the filter system. Observe
all installation precautions.
The filter systems can be adapted to various pipe sizes by using reducing bushings at either end. The
filter system has 1” NPT ports. 3/8” NPT reducer bushings are supplied if needed.
Filter System Assembly:
1. Turn off incoming water line.
2. Mount bracket onto filter head. Use mounting holes provided to mount the system to a wall or
support structure.
3. Install a shut-off valve on the incoming cold water supply line.
4. Connect the incoming cold water supply to the filter system’s inlet water connection.
5. Connect the outlet port of the system to the outlet water line.
6. Install drain valve on the outlet water line.
for assembly.
7. After all connections are complete, unscrew sump from filter head and remove o-ring (Gasket)
from bottom of sump and place on top of sump. If unit comes with cartridge installed, o-ring
(Gasket) should already be installed. Install cartridge, referring to the cartridge replacement
instructions, if necessary.
8. Turn on incoming water to the system.
9. Pressurize system. Check for leaks. Retighten connections if necessary.
gallon of water through new cartridge to remove entrapped air.
10. System is now ready for service.
Note: If flush kit is used, follow instructions supplied
Flush a minimum of 1
Cartridge Replacement Instructions
The CFS5400/CFS5400N Systems are designed to use only the 3M Water Filtration Products CFS5400C
replacement cartridge. Use of housings and replacement cartridges other than those specified below
may seriously compromise water quality and/or cartridge life.
Note: The CFS5400C cartridge has a grain capacity of 4,200 grains. When used in the CFS5400
system, gallon throughput will increase by 25% or better, dependent upon incoming
hardness levels. When used in the CFS5400N system, the system will provide complete
softening for 4,200 grains.
1. Turn off incoming water supply.
2. Depress pressure relief button on top of filter head to relieve pressure in filter.
3. Unscrew sump from filter head. Empty water from sump and dispose of spent cartridge.
4. Clean and inspect all components including the o-ring seal. Lubricate o-ring seals with a light
coating of food grade lubricant. Replace o-ring seal if there is visible damage.
5. Install new cartridge into sump.
6. Place lubricated o-ring onto sump groove. Screw sump into head. Tighten with the wrench
provided (p/n 68900-33). After approximately 1 turn, additional resistance will be felt as gasket
engages with head. Continue turning until sump becomes snug and cartridge is sealed.
7. Turn on incoming water supply.
8. Depress pressure relief button on filter head until air is purged from system. Flush a minimum of 1
gallon of water through new cartridge prior to service to remove entrapped air.
Part Numbers
5
1
1. Head Assembly with bypass
(CFS5400) - 62009-04
6
2
1. Head Assembly without bypass
(CFS5400N)- 62009-01
2. O-ring - 68898-32
4
3
3. Sump - 62010-32
4. CFS5400C Cartridge - 56066-01
5. Bracket Kit - 68901-31
6. Reducer Bushing - 72-811606
7. Wrench - 68900-33
Optional Flush Kit (not shown) - 56065-01
7
Limited Warranty
CUNO Incorporated warrants this Product (excluding disposable filter cartridge(s)) to be free from defects in material and workmanship for two (2) years from the date
of purchase. The disposable filter cartridge is warranted from defects in material and workmanship for a period of one (1) year from the date of purchase. This
warranty does not cover failures resulting from abuse, misuse, alteration or damage not caused by CUNO or failure to follow installation and use instructions. If the
Product is defective CUNO will replace the Product or refund your Product purchase price. CUNO will not be liable for any indirect, special, incidental, or con-sequential
damages arising from the use of this Product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may
not apply to you. To obtain warranty service, mail your request to Warranty Claims, CUNO Incorporated, 400 Research Parkway, Meriden, CT 06450. Proof of purchase
(original sales receipt) must accompany the warranty claim, along with a complete description of the Product, model number and alleged defect. This warranty gives
you specific legal rights and you may have other rights which vary from state to state, or country to country.
CUNO Incorporated
400 Research Parkway
Meriden, CT 06450, USA
Toll Free: 1-888-218-CUNO
Worldwide: 203-237-5541
Fax: 203-238-8701
www.cunofoodservice.com • www.cuno.com
3M is a trademark of 3M Company.
© 2009 3M Company. All rights reserved.
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