Davey Housings & Cartridges - Manual (Page 2)

Temperature Rating
Maximum 50 o C - Minimum 4 o C
Pressure Rating
Maximum working pressure – 125 psi / 850kPa.
If your fluid system is suspected to have high night time pressures or occasional
high pressure surges/water hammer (which can be induced by the quick acting
valves in equipment such as washing machines and dishwashers) or the pressure
is regularly/typically over 100 psi / 680 kPa - then it is recommended that an
anti-hammer device (before/after) or a pressure reducing valve be installed before
the filter housing.
Installation
Housings are easily installed on cold water lines. The water supply should be
turned off at the meter or, preferably, a shut off valve installed before (and after is
also recommended) the housing inlet to allow for easy installation/replacement of
cartridges.
When installing your housing allow a minimum of 2” (50mm) clearance BELOW the
housing bowl for cartridge replacement. The filter housing connections (inlet/outlet)
are standard ½”, ¾”, 1”, 1 ½” connections and can easily be installed on copper,
plastic or galvanised pipe by use of the appropriate fittings.
Brackets should be used for mounting the filter housing unit to avoid bending pipe
during installation and when replacing cartridges (galvanised mounting brackets
and screws are supplied).
Once the housing head has been properly connected to the pipework, place the
filter cartridge in the bowl and slowly screw bowl onto the head. Open the tap
downstream of the filter and then open the inlet valve. When all air has escaped
from the housing, downstream tap can be turned off.
Caution: The housing must be protected against freezing. Failure
to do so may result in cracking of the housing and water leakage.
Sediment Cartridge Filter Life
Once the housing is properly installed, a reduction in flow/pressure (to such an
extent as to cause inconvenience) will indicate when the cartridge is becoming
clogged and needs replacing/cleaning. Sediment cartridges should be replaced/
cleaned/sanitised when the water flow has been noticeably reduced/or after 3-6
months - whichever comes first (this is for hygiene reasons).
Activate Carbon Cartridge Filter Life
These should be replaced when they no longer remove taste or odour from the
water, or when blocked, or after 6 months - whichever comes first (the latter
recommendation is for reasons of hygiene - Bacteriostatic cartridges can be used
up to a maximum of 12 months).
Changing the Filter Cartridge
1. Turn off the valve to stop the flow of water.
2. Release the pressure by opening a tap downstream, or use the pressure relief
valve that is available in the lid of some filter housings.
3. Unscrew the bottom housing from the lid and pull out the used cartridge and
discard or wash. The inside of the filter housing and the lid should be checked
for cleanliness - they will usually need to be cleaned or sanitised - use hot
water and dishwashing liquid, thoroughly scrub all surfaces and then rinse.
4. Check that the oring is in position in the top of the housing base, lubricate with
a coating of white petroleum jelly (Vaseline), place the oring into the groove
and with two fingers wipe the oring down into the groove. Do not wipe the oring
clean of lubricant after it has been properly seated in the groove because the
lubricant prevents “crawling” of the oring during the tightening of the lid and
thus prevents water leaks.
5. Screw the housing onto the lid and hand tighten. Open the tap downstream of
the filter and then open the inlet valve.
NOTE: Actual filtration/purification life of cartridge can vary with the
condition of incoming water.
WARNING: DISINFECTION MAY ALSO BE REQUIRED ON UNTREATED
WATER SUPPLIES. We recommend STERIFLO ® Ultraviolet Disinfection
Systems.
IMPORTANT: When opening the filter housing to install or change the
cartridge (element) it is common for the oring seaI to lift out of the groove
and, at times, it may even stick to the cap.
CAUTION WHEN INSTALLING
1. This is a plastic product with a female thread. If you cross-thread a
male fitting, and/or you over pack with sealing tape, you could do
permanent damage.
2. If you use a tapered thread male fitting do not over tighten.
3. No warranty claims will be considered for damage due to incorrect
installation.
WARNING: CAREFULLY AND GENTLY TIGHTEN WITH HOUSING SPANNER
as the bowl should only be tightened enough to avoid water leaking
during operation.
CAUTION: In some countries metal pipework is used as earth. If applicable
in your country, housings installed on metal pipelines must have a jumper
wire installed from the metal pipe on the inlet to the metal pipe on the
outlet. This work must be carried out by a suitably qualified person.
WARNING: If the water system is not going to be used for extended
periods, the cartridge should be removed from the housing and replaced
with a new or cleaned cartridge when the system is used again.
WARNING: Do not over tighten inlet/outlet connections - stripped threads
will result.
What is “Water Hammer”?
Water hammer occurs when water flowing through a pipeline is stopped abruptly.
A high intensity pressure wave then travels back and forth through the piping
system - which can cause a pounding / knocking noise - and can result in costly
damage to pipe, fittings, seals - and equipment such as water purifier modules.
Water hammer is caused by many modern lever style taps - these levers allow you to
shut off the water flow very abruptly.
Water hammer is also caused by the electrically operated solenoid valves in your
dishwashing and clothes washing machines.