Wilo ISAR MODH1 Series, Installation And Operating Instructions Manual

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9
7.2
7.2.1
7.2.2
7.2.3
Installation
Foundation/bearing surface
The pressure-boosting system is designed for
installation on a level concrete floor. The base
frame is mounted on height-adjustable vibration
absorbers as means of insulation against structure-
borne noise.
NOTICE!
For transport reasons, the vibration absorbers may
not be installed upon delivery. Before installing
the pressure-boosting system, check that all the
vibration absorbers are fitted and locked using
threaded nuts.
Note:
If the customer also wants to fix the installation to
the floor, suitable measures must be taken to avoid
structure-borne noise transmission.
Hydraulic connection and pipes
For connections to the public drinking water sup-
ply network, the requirements of the responsible
local water supply company must be met.
The installation must not be connected until all
the welding and soldering work, necessary flushing
and, if required, disinfecting of the pipe system and
the pressure-boosting system has been done (see
Point 7.2.3).
The customer’s pipes must be installed without
tension. Compensators with extension limiters or
flexible connection pipes are recommended for
this purpose in order to avoid stress at the pipe
adaptors and minimise the transmission of system
vibrations to the building installation. In order to
prevent the transmission of structure-borne noise
to the building, do not secure the pipe clamps to
the pressure-boosting system pipework.
The flow resistance of the inlet and suction line
must be kept as low as possible (i.e. short pipes,
few elbows and sufficiently large shut-off valves),
otherwise the protection against low water level
may suffer severe pressure losses in the event of
high volume flows. (Observe the NPSH of the pump
and avoid pressure losses and cavitation.)
Hygiene
The supplied pressure-boosting system meets
the standards of current technology and has been
checked at the factory to make sure it functions
correctly. Please remember that when used in
drinking water applications, the complete drinking
water installation has to be handed over to the
operator in a perfect state of hygiene.
Also observe the local authoirity corresponding
specifications in this also includes microbiological
requirements, flushing if necessary and also disin -
fecting in some circumstances.
WARNING! Contaminated drinking water is a
health hazard!
Flushing the pipes and system reduces the risk of
impairing the quality of the drinking water! The
water must be completely replaced after a long
system standstill!
7.2.4
7.2.5
7.2.6
For the simple flushing of the system, the installa-
tion of a T-connector on the end pressure side of
the pressure-boosting system is recommended (if
there is a diaphragm pressure vessel on the pres-
sure side, immediately downstream of it) upstream
of the next shut-off device. Its branch, provided
with a shut-off device, drains into the waste water
system during the flushing process and has to be
dimensioned according to the maximum vol-
ume flow of a single pump. If it is not possible to
achieve free drainage, such as when connecting
a hose, the requirements of Regulation 4 must be
observed.
Protection against dry running/low water level
(accessories)
Low water pressure switches are fitted to the inlet
pipe of all pressure-boosting systems and
MUST
be set during commissioning once connected to
the break tank to ensure that the unit stops before
any air enters the system.
• For alternative protection via a float switch fit the
float switch in the tank so that if the water
level drops to approximately 100 mm above the
draw-off connection, the “low water” switching
signal is transmitted (see 8.2).
Diaphragm pressure vessel
For transportation and hygienic reasons, the dia-
phragm pressure vessel (8 litre) – which is part of
the scope of delivery – is delivered unmounted as
an accessories kit. The diaphragm pressure vessel
must be mounted on the throughflow fitting
before commissioning.
NOTICE!
Make sure the throughflow fitting is not twisted.
The fitting is installed correctly when the drain
valve and the flow direction arrows printed on it are
parallel to the collecting pipe.
Non-pressurised break tank (accessories)
To connect the pressure-boosting system indi-
rectly to the public drinking water mains, it must
be installed together with a non-pressurised break
tank. The rules for the pressure-boosting system
apply to the installation of the break tank as well.
The entire base of the tank must be in contact
with a solid bearing surface. The maximum volume
of the tank concerned must be considered when
dimensioning the bearing capacity of the bearing
surface. When installing, make sure there is suffi -
cient space for inspection work (at least 600 mm
above the tank and 1,000 mm on the connection
sides). The tank must not slant when full, because
an uneven load may cause damage.Conections to
the tank must be made in accordance with local
water regulations.
Caution! Risk of property damage!
The tanks are statically designed for their nom-
inal capacity. Subsequent changes can affect the
static forces and cause impermissible deforma-
tions or damage to the tank!
NOTICE!
Before filling the tank, clean it and flush it!