Watts OneFlow OFTWH-R User manual

Watts-Oneflow.com
OneFlow®
OFTWH-R, OFTWH
Innovative Scale Control
Installation manual
Installation and Operation Manual
UK
OFTWH-R
OFTWH

2OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
Index
1. Introduction .................................................................................................................................................................................... 3
2. System Specifications........................................................................................................................................................... 3
2.1 Feed Water Chemistry Requirements
3. Installation ........................................................................................................................................................................................ 4
3.1 Installation Precautions
3.2 Installation
4. Operation........................................................................................................................................................................................... 5
5. Maintenance ................................................................................................................................................................................... 5
5.1 Cartridge change frequency
5.2 Replacement cartridges
6. Dimensions ...................................................................................................................................................................................... 7
WARNING!
WARNING!
It is recommended that all personnel responsible for
operation and maintenance of this product read all
installation instructions and product safety information
thoroughly before beginning the installation of this product
to ensure the best possible installation. Failure to read
and follow all safety and use information can result in
serious personal injury, property damage, or damage to
the equipment. This manual contains important operation,
maintenance and precautionary information. Please retain
this manual for future reference for parts, maintenance or
troubleshooting and present this manual to user/operator/
owner after installation.
The OneFlow®system is built with the finest and most
advanced materials and each system is quality inspected
and pressure tested prior to shipment. With proper
installation and routine maintenance, you will have years of
trouble-free operation.
Please refer to this manual when performing routine
cartridge changes. The instructions make periodic
maintenance quick and easy and ensure you will receive
maximum benefit from your system.

3
OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to carry out
any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer’s assent to Watts terms and
conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any form,
unless agreed to in a writing signed by an officer of Watts.
1. Introduction
The OneFlow®Innovative Scale Control System provides
protection from hard scale formation on internal plumbing
surfaces. The OneFlow®system is a single cartridge-based
system that must be installed on a cold water line prior to a
single water heating device (water heater or tankless water
heater) that requires protection from the ill effects of hard water.
OneFlow®uses template assisted crystallization (T.A.C.) to
attract hardness minerals and convert them into harmless,
inactive microscopic crystal particles. These crystals stay
suspended in the water and are passed to drain. The system
requires very little maintenance, no backwashing, no salt and
no electricity. Typical hardness problems, especially build-up of
scale in heating elements, pipes, water heaters, boilers are no
longer a concern. OneFlow®is not a water softener. It does not
need additional chemicals. It is a hard scale prevention device
with proven third party laboratory test data and years of suc-
cessful commercial, residential and foodservice applications.
OneFlow®is the intelligent scale solution and is a great alterna-
tive to water softening or scale sequestering devices.
OFTWH-R - OFTWH
• OneFlow®converts hardness minerals to harmless,
inactive microscopic crystals making OneFlow®an effective
alternative to water softeners
• Virtually maintenance free - No salt bags or other chemicals
required
• No energy consumption (different compared to other scale
control technologies)
• Contributes to reduce water and electric consumption, no
control valve needed
• Innovative technology with an enhanced respect of the
environment, salt free, without additional chemicals
• Improves efficiency of all water heating devices and down-
stream plumbing components
• Simple sizing & installation – standard 3/4” connections
• Perfect solution for homes where equipment protection
is desired for longer equipment life and reduced energy
consumption
• OneFlow®cartridge-based systems are easily maintained;
change the TAC cartridge once every two years
• Mounting bracket and wrench for cartridge change-outs
included
* Exceeding maximum flow can reduce effectiveness and void
warranty. Pressure drop at peak flow rate is less than 1 bar at
27°C feed water.
** This system is delivered with 3/4” fittings.
*** See more information on our website: www.watts-oneflow.com
2. System Specifications
Inlet/outlet connections: 3⁄4" BSP threaded fittings
Peak flow rate OFTWH-R up to 23l/min
Peak flow rate OFTWH up to 38l/min
Flow capacity (continuous flow rate):
OFTWH-R up to 15,2Lit/min, 24/7/365 for 2 years for the
OFTWH-R-RM cartridge
OFTWH up to 22,7Lit/min, 24/7/365 for 2 years for the
OFTWH-RM cartridge
Maximum pressure: 90psi / 6.2 bar
Maximum temperature: 38°C
Minimum temperature: 5°C
Weight: OFTWH = 6,2Kg | OFTWH-R = 5,7Kg
Capacity: OFTWH-R-RM and OFTWH-RM cartridges do not
have a grain removal capacity, however, other elements present
in the water will gradually degrade the effectiveness of the car-
tridge. Change the OFTWH-R-RM and OFTWH-RM cartridges
at least once every two years.
A OneFlow®Innovative Scale Control system shall be installed on
the cold water service line to condition the tap water just prior to
the service line feeding the equipment it is designed to protect.
The system will be sized for maximum or peak flow rate based
on the specification of said equipment. A OneFlow®system may
also be installed to protect multiple pieces of equipment from
the ill-effects of hard water scale provided the aggregate peak
flow rate for each piece of equipment it is protecting has been
considered. The system shall be plumbed with a bypass valve to
allow isolation of filter housing to allow the bypass of untreated
water in the event that service or cartridge replacement be nec-
essary. Bypass is recommended but not required. The installa-
tion area should be suitable in size for the housing to be serviced
without encumbrance. The OneFlow®system does not require
additional water to backwash, flush, or regenerate once put into
service. The system shall not require any chemical additives and
shall not require electricity for operation.

4OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to carry
out any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer’s assent to Watts terms
and conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any
form, unless agreed to in a writing signed by an officer of Watts.
All these water chemistry requirements are corresponding to
the average parameters of the water delivered usually, please
contact your water supplier or local autorities in order to confirm
the compliance.
Notice
* Systems using OneFlow®technology are effective at control-
ling limescale formation inside the plumbing system at influ-
ent hardness levels up to 427mg per liter (28.8°D, 51.3°F) of
calcium carbonate. Due to variances in water chemistry,
427mg per liter is a recommended hardness maximum due
to potential aesthetic issues related to soft scale residue
formation outside the plumbing system. Testing should be
performed to determine proper application where hardness
levels exceed 427mg per liter.
** Just as with conventional water softening media, OneFlow®
media needs to be protected from excess levels of certain met-
als that can easily coat the active surface, reducing its effective-
ness over time. Public water supplies rarely, if ever, present a
problem, but if the water supply is from a private well, confirm
that the levels of iron (Fe) and manganese (Mn) are less than 0.3
mg/l and 0.05 mg/l, respectively.
Notice
† OneFlow®media does not reduce silica scaling. While silica
tends to have a less significant effect on scale formation than
other minerals, it can act as a binder that makes water spots
and scale residue outside the plumbing system difficult to
remove. This 20 mg/l limitation is for aesthetic purposes.
†† All other water contaminants must meet the requirements of
the local water control agency of each specific country where
OneFlow®is sold and installed. Specific Mineral and Metal
Maximum Contaminants Level’s, identified in the above Feed
Water Chemistry Requirements list, supersedes those require-
ments. Water known to have heavy loads of dirt and debris may
require a pre-filtration prior to OneFlow®.
2.1 Feed Water Chemistry Requirements
pH 6.5-8.5
Hardness (maximum) 427 mg/l CaCO3 (28,8°dH, 51,3°fH)*
Water Pressure 1.03 - 6.2 bar
Temperature 5 - 38°C
Free Chlorine <2 mg/l
Iron (maximum) 0.3 mg/l**
Manganese (maximum) 0.05 mg/l**
Copper 1.3 mg/l
Oil & H2S Must be Removed
Total Phosphates < 3.0 mg/l
Silica (maximum) 20 mg/l
†
TDS 1500 mg/l
††
3. Installation
3.1 Installation Precautions
You are required to consult the local and state building and
plumbing codes and regulations prior to installation. If the
information in this manual is not consistent with local building
or plumbing codes, the local codes should be followed. Inquire
with governing authorities for additional local requirements.
Periodic inspection and yearly maintenance by a licensed
contractor is required. Corrosive water conditions and/or
unauthorized adjustments or repair could render OneFlow®
ineffective for service intended. Regular checking and cleaning
of the device’s internal components helps assure maximum
life and proper product function. Frequency of cleaning and
inspection depends upon local water conditions.
• Do not use with water that is microbiologically unsafe or
of unknown quality without adequate disinfection before
or after the system
• Connect system ONLY to COLD water supply. Water
temperature cannot exceed 38°C. Do NOT install system
on HOT water line. Failure to limit line temperature to
38°C may result in housing failure and damage.
• Do NOT allow system to freeze. Turn off water supply to
housing and drain housing if temperature falls below 5°C.
• Please provide a shut-off valve before and after the
OneFlow®device so it can be isolated for maintenance
at all times.
• Do NOT install system in direct sunlight or where system
is exposed to harsh chemicals or may be subjected to
being struck by moving equipment, carts, mops or any
other item that may cause damage.
• Do NOT mount the OneFlow system near any source of
heat or above any device or area that would be adversely
effected by water.
• Do NOT install system with pressure above 6.2 bar.
• Do NOT install the system backwards with the feed water
line connected to the outlet. The direction of flow through
the OneFlow unit is always Through the inlet first; keep
this in mind when determining installation location.
• The device should be installed in an upright and level
position, with both inlet and outlet connections in a hori-
zontal position.
• We do not recommend to apply any other antiscalants
before or after OneFlow.
• Do NOT use liquid pipe compounds for fitting connec-
tions 3/4”MBSP. Use two to three wraps of PTFE tape.
SOFT SCALE SPOTTING
Depending on hardness of the water, soft scale spotting
may occur on external plumbing surface. But in most
cases, these spots can be easily wiped down with a
damp cloth and will not form hard scale deposits.

5
OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to carry out
any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer’s assent to Watts terms and
conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any form,
unless agreed to in a writing signed by an officer of Watts.
• Do NOT solder plumbing connections attached to filter
housing will be damaged by high temperature.
• Do NOT overtighten fitting connections into housing outlet.
• Always back-up valves and fittings with a wrench when
installing a fitting to avoid turning the valve.
• Position the OneFlow unit in a suitable location.
• ALLOW a minimum of 8 to 10 cm under the housing to
allow for filter replacement.
• Do NOT install the unit behind equipment where it may be
difficult to access the system for filter replacement.
• If water hammer is evident, install water hammer arrestors
before the OneFlow unit.
WARNING!
Installation with copper (Cu)
*** We do not recommend to install OneFlow®with new cop-
per pipes or devices. Excessive copper levels can foul the
OneFlow®media. If NEW copper lines or devices had been
installed, they need to be passivated for a minimum of 4 weeks
before placing the device into service.
WARNING!
Closed systems/still water
Avoid use in closed circuits (eg hydronic systems) and low
flow installations or standing water (max. 72 to 120 hours,
depending on the quality of the incoming water).
• Do not apply any other antiscalants before or after OneFlow®.
• You are required to consult the local building and plumbing
codes prior to installation. If the information in this manual
is not consistent with local building or plumbing codes,
the local codes should be followed. Inquire with governing
authorities for additional local requirements.
• Need for periodic inspection and yearly maintenance:
Periodic inspection and yearly maintenance by a licensed
contractor is required. Corrosive water conditions and/or
unauthorized adjustments or repair could render the device
ineffective for service intended. Regular checking and clean-
ing of the devices internal components and check stops
helps assure maximum life and proper product function.
Frequency of cleaning and inspection depends upon local
water conditions.
3.2 Installation instructions
1. Close the water system. Turn off all equipment to be fed by
the OneFlow®System.
2. Determine if the water line has an existing water treatment
system. If so, examine system for use of polyphosphate or
other scale inhibitors. OneFlow®will not be effective if used
in conjunction with other scale inhibitors. Remove the scale
inhibitors from the water line or discontinue installation.
www.watts-oneflow.com/register
4. Operation
With sufficient pressure, operation of the Watts OneFlow®
System is completely automatic. Dependable operation involves
only periodic cartridge changes and service documentation.
3. Drill the wall and insert the dowels. Screw the bracket tightly to
the wall. The system must be vertical and upright.
4. Remove the OneFlow®housing shell from the housing cap and
make sure that the O-ring is correctly in place. When attaching
the shell back to the cap, make certain the O-ring is properly
positioned.
5. Connect OneFlow®by using PTFE tape. Use two to three
wraps of PTFE tape on the fitting connection.
6. Run a suitable line from the 3/4” full-flow ball valve at the
tap water source to the inlet ball valve on the left side of the
OneFlow®system. Use 2-3 wraps of PTFE tape and brace the
inlet ball valve on the system with a wrench when connecting
7. Select the appropriate size tubing for the equipment being
fed and connect it to the outlet of the OneFlow®System.
NOTE: DO NOT connect the tubing to the equipment at this
time. Prior to making connection to the equipment, this line
will be used to facilitate flushing the system. As an option,
a drain valve in a tee on the outlet side of the OneFlow®
system could be provided in the line to facilitate flushing when
changing cartridges.
8. With OneFlow®inlet valve closed, slowly open the 3/4” full-flow
ball valve at the tap water source. Check for leaks.
9. If a drain valve was not installed on the outlet side of the
system, hold the tubing that will connect to equipment in a
clean bucket or over sink or drain. Open the system inlet feed
valve and allow water to flush through system for 2 minutes at
the specified system flow rate to allow air bubbles to escape.
NOTE: NO ACTIVATION IS REQUIRED FOR THE OneFlow®
SYSTEM TO PERFORM PROPERLY. FLUSHING IS
RECOMMENDED TO ALLOW AIR TO ESCAPE THE SYSTEM.
10. Make certain that the end of the tubing to be connected
to the equipment is clean and sanitary.
11. Connect tubing to equipment. Open all water supply valves
and check for leaks.
12. If no leaks, turn on equipment and check for normal operation.
13. Register the OneFlow®system to ensure proper operation.

6OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to carry
out any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer’s assent to Watts terms
and conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any
form, unless agreed to in a writing signed by an officer of Watts.
5. Maintenance
Routine maintenance of your OneFlow®system involves periodic
cartridge changes and/or replacement of sump O-rings.
If the system sizing recommendations have been followed,
the OneFlow®cartridge should last two years.
5.1 Cartridge change frequency
The cartridges should be changed in response to the following
conditions.
OFTWH-R-RM • 24 months since installation or last cartridge
change.
OFTWH-RM • 24 months since installation or last cartridge change.
5.2 Replacement cartridges
OneFlow®systems can only be used with OneFlow®filter
cartridges. Use of replacement cartridges other than those
specified will void warranties, certifications and may compromise
equipment protection, water quality and equipment life.
Cartridge replacement procedure
1. IMPORTANT: All other equipment connected to the OneFlow®
system must be turned off prior to shutting off water supply
from filters.
2. Release pressure by turning the black screwable plastic swivel
button identified by the “VENT” sign (H).
3. Turn OFF water to OneFlow®system by closing
inlet ball valve.
4. Remove housing – use cartridge wrench if necessary.
5. Remove cartridge from housing. Clean inside of housing with
warm water. If desired, disinfect housing by adding a teaspoon
of household bleach to housing, fill with water, let stand for 5
minutes, and then discard.
6. Insert new cartridge into the housing. Match cartridge model
number to model number on bracket.
7. Check O-ring (E) for damage and replace if damaged or
distorted. Make certain the O-ring is properly positioned and
reinstall filter housing (hand tighten only).
8. Slightly open the inlet ball valve; open the pressure relief
swivel (H) to release trapped air until a small amount of water
comes out – close the pressure relief button and fully open
the ball valve.
9. VERY IMPORTANT: With water supply inlet valve OPEN and
water flow confirmed, turn on connected equipment. Failure to
supply water to equipment may cause serious damage.
Parts of OneFlow®OFTWH / OFTWH-R
Drawing ID Description
A Mounting Screws
B Mounting bracket
C Housing cap
D Replacement Cartridge
E O-Ring
F Housing shell
G Cartridge wrench
H Pressure relief screw
A
B
C
D
E
F
G
H

7
OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1
Watts Water Technologies, Inc.
UK
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to carry out
any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer’s assent to Watts terms and
conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any form,
unless agreed to in a writing signed by an officer of Watts.
NOTICE
Please allow additional clearance above the device for making connections and replace the cartridge.
6. Dimensions
192
723
108
164
189
100
142
150
100
624

OFTWH_OFTWH-R_IT_IOM_UK_02_21_Rev1 © 2021 Watts
Guarantee
Watts products are thoroughly tested. The said guarantee covers solely replacement or – at the full
sole discretion of WATTS - repair, free of charge, of those components of the goods supplied which
in the sole view of Watts present proven manufacturing defects. The period of limitation for claims
based on defects and defects in title is two years from delivery/the passage of risk. This warranty
excludes any damage due to normal product usage or friction and does not include any modified or
unauthorized repair for which Watts will not accept any request for damage (either direct or indirect)
compensation (for full details see our website). All sales subject to the Watts terms to be found on
www.wattswater.eu
UK
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