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UK
MULTI-STAGE FILTERS WITH
SELF-CLEANING PRE-FILTER
WHOF2
1.
Technical specifications
The self-cleaning pre-filter has a nominal filtration of 50 micron.
When the filtering element is clogged, it is simply cleaned by
opening the valve on the bottom of the cup (figure 1).
This operations generates a depression in the filter that pushes
the cartridge down, automatically reversing water flow from the
inside (in counter-current) out of the cartridge (figure 2).
This water flow in counter-current carries particles and
substances deposited on the cartridge to the drain. Closing the
valve after a couple of seconds returns pressure distribution to
its initial conditions and the internal spring returns the cartridge
to its service position (figure 3).
The multi-stage filter features a drain funnel to prevent pollution
by backflow, in accordance with European standard UNI EN
1717.filter to reach maximum pressure in counter-current and
the best cartridge cleaning results.
WARNING
The above described operating modes and cleaning in counter-
current occur in excellent conditions with minimum 1.8 BAR
supply pressure.
WARNING
•
Only use the filter in the operating conditions indicated on
the sticker on the filter bowl.
•
If the sticker is tampered, damaged, not legible or missing,
applicable working conditions are: max pressure 8 bar,
max temperature 45°C.
•
If pressure exceeds use limits, protect with a pressure
reducer.
•
Install an "anti-water hammer" system to protect the filter.
In case of installation on systems powered by a pump and
especially on those equipped with a pressure and flow
controller, an additional expansion vessel must be installed
upstream the filter to protect it from eventual repeated
pressure peaks (figure C).
•
Keep away from light sources.
•
Keep away from excessive heat and cold.
General directions for use
•
Only use self-cleaning filters to filter mains or well water and
to filter sand and other large impurities from water with pH
levels between 6.5 and 9.5. Do not use the filter to filter silt.
Do not filter other liquids.
•
Multi-stage filter is not a purifier: do not use to filter water
intended for drinking if inlet water quality is not guaranteed
for this use or if its origin and quality are unknown.
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.
The range of multi-stage filters is made of double units with self-
cleaning pre-filter.
2.
Installation
WARNING
•
Before the installation, carefully lubricate the housing o-ring
which is located at the bowl top. Use an adequate food-
grade lubricant.
•
Before the installation, check if the hydraulic system has
been set-up according to the rules-ofthe art in force.
•
Install the products in sheltered rooms and protected from
freeze and excessive heat.
Refer to figures:
A. Applicable sealant and applicable fittings (depending on
model)
B. IN - OUT directions presentation and vent-valve (VV) location
C. Installation lay-out (In case of installation without OneFlow
if present, install the OneFlow
1. Municipal water mains
2. Non-return valve
3. Pressure reducer
4. By-pass
5. Anti-water hammer device
6. Multi-stage filters with self-cleaning pre-filter
7. Other utilities
Before installing the filter, it is strongly recommended the
installation of a by-pass and shut-off valve, while keeping both
the filter inlet and outlet closed.
•
Screw the ball valve to the threaded port for discharge on
the bottom of the housing, making sure that the gasket
of the valve is in place, then screw the drain funnel or the
plastic hose-holder to the ball valve, making sure that the
gasket is in place.
•
Avoid all kind of tensions by using wall brackets as a
support.
•
Connect the inlet to the product's side with the indication
IN and the outlet to the side with the indication OUT.
•
Connect to pipes using cylindrical (parallel) fittings (BSP –
ISO 228), possibly with flexible hoses.
•
Connect to tapered (conical) fittings (ANSI/ASME B1.20.1)
only if the product is marked with NPT on head.
WARNING
Only use tape to seal filter connections.
3.
Connection to waste line
Connect a rubber tube to the drain funnel or hose fitting at the
base of the filter, secure with a clamp and have it discharge into
the drain (figures 4A and 4B). The drain point must be lower
after the WHOF2 filter):
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