4
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.
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.
