Wilo COR MHIE Series, Installation And Operating Instructions Manual

Page: 10 / 44

English
10 WILO SE 03/2019
The diaphragm pressure vessel (total capacity
ca. 8 litres) produces a buffer effect on the pres
-
sure sensor and prevents all oscillation behaviour
of the control at the point of commissioning and
decommissioning the system. It also enables a low
extraction of water (for example, in the event of
the smallest leakage) from the available storage
volume without activating the main pump. This
reduces the pumps’ switching frequency and sta
-
bilises the pressure-boosting system’s operation
status.
7 Installation and connection
7.1 Delivery and installation
Unwrap the product and remove the packaging in
an environmentally responsible manner.
Install the pressure-boosting system in an easily
accessible room, which is well ventilated and is
insulated against frost. Access routes to the room
must be kept clear of obstructions.
The pressure-boosting system’s design enables
floor-mounted installation on a flat concrete
surface. As the baseplate is placed on height-
adjustable vibration absorbers, the installation is
already equipped with insulation against sound
transmission.
If the system is to be further fixed to the ground
on-site, appropriate measures must be taken to
prevent the transmission of sound through such
structures.
7.2 Electrical connection
WARNING! Risk of electrical shock!
Electrical connection must be performed by an
electrician approved by the local energy supplier
and in accordance with current local regulations.
When making the electrical connection, it is cru
-
cial that the corresponding installation and oper
-
ating instructions and the circuit diagram supplied
with the switchgear are referred to accordingly. In
general, the following aspects must be observed:
• The mains connection voltage must correspond to
the characteristics detailed on the rating plate and
the wiring diagram for the switchgear,
• The electrical connection cable for the switchgear
must be correctly dimensioned in terms of the
total power of the pressure-boosting system
(see the rating plate and the technical data),
• The pressure-boosting system must be earthed in
accordance with regulations (i.e. in accordance
with local regulations and conditions); the con
-
nections for this purpose are marked accordingly
(also see the wiring diagram).
NOTICE:
Do not forget to connect the baseplate of the
pressure-boosting system to the ground where
the system is installed.
7.3 Hydraulic connection
For connection to the municipal water mains, the
relevant local water supply companies’ require
-
ments must be observed.
The system may only be connected after all the
welding and soldering work has been carried out
and after the (mandatory) flushing and (optional)
disinfection of the hydraulics circuit and the sup
-
plied pressure-boosting system.
It is absolutely imperative for the voltage to be cut
while the onsite pipework is being installed. It is
advisable to use length-limiting compensators or
flexible connection lines for this to prevent the
rigid connections from deforming and to reduce
the transfer of system vibrations to the building.
In order to prevent the transmission of structure-
borne sounds to the housing, the pipe attach
-
ments must not be fitted to the pressure-boost
-
ing system’s pipework.
The connection is made according to the local
conditions either to the right or left of the system.
The openings that are not used are then blocked
using the plugs supplied.
Keep the resistor at the flow of the suction line as
low as possible (in other words: a short line, few
bends and sufficiently large gate valves), other
-
wise the protection against low water level may be
triggered during high pressure losses or high out
-
put volumes (take the pump’s NPSH into account
and avoid pressure losses and cavitation).
The suction and discharge manifolds can be
connected either to the left or the right.
Before connecting the pressure-boosting system,
fit valves to the 2 collector tanks to isolate them
when performing work on the system.
CAUTION!
• If the pressure-boosting system is connected to
a pressurised municipal water supply, ensure
that the system can withstand the maximum
pump pressure at zero flow rate plus the pres
-
sure of the municipal water supply. If this is not
the case, a pressure reducer must be fitted to
the output of the pressure-boosting system.
• We strongly recommend installation of a differ
-
ential pressure control device on the water inlet
pipe to avoid pressure fluctuations at the input
to the pressure-boosting system.
If the pressure-boosting system is in suction
mode in a replenishment reservoir, the friction
losses must not exceed the pumps’ maximum
suction capacity.
It is advisable to use a foot valve with piping of
equal or greater dimensions than the nominal
diameter of piping on the suction side.
The system must always be equipped with a
pressure tank.