Scope Of Delivery; Accessories (Optional); Description And Function; Description Of The Product - Wilo HiMulti 3 H Serie Einbau- Und Betriebsanleitung

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5.3 Scope of delivery

• Domestic water system acc. to identification
• Installation and operating instructions (domestic
water system and pump acc. to type)
• Packaging

5.4 Accessories (optional)

• Foot valve
• Suction filter
• Suction hose
• Floating extractor with or without non-return
valve
• Float switch
• Switchgear with submersible electrodes

6 Description and function

6.1 Description of the product

The domestic water system is supplied as a preas-
sembled and wired-up unit.
Its principal components are as follows (see posi-
tions in Figs. 1 and 2):
1 - Pump
2 - Filling/venting screw plug
3 - Venting screw plug
4 - Diaphragm pressure vessel
5 - Pressure gauge
6 - Mains cable with plug
(only EM, mains 1~230 V version)
7 - Pressure switch
8 - Flexible pressure hose
9 - Gas filling valve of the diaphragm pressure
vessel
The parts that come into contact with the fluid are
made from a corrosion-resistant material. The
pump housing is sealed against the motor by
means of a mechanical seal.
CAUTION!
The pump must not be allowed to run dry. Dam-
age to the pump due to running dry will not be
covered by the manufacturer's warranty.
To protect the pump of the domestic water sys-
tem against running dry, we recommend using
appropriate accessories such as a float switch, an
additional pressure switch or switchgear with level
electrodes.
CAUTION!
Risk of damage to the domestic water system!
Danger of damage due to incorrect handling
during transport and storage.
In AC motors (EM 1~230 V version), the thermal
motor protection switches the motor off in case of
overload. Once the motor has cooled down, it
switches back on automatically.

6.2 Function of the product

The domestic water system is equipped with an elec-
tric centrifugal pump (Figs. 1 and 2, item 1), a pres-
sure switch (Figs. 1 and 2, item 7) and a diaphragm
pressure vessel (Figs. 1 and 2, item 4).
The pump increases the pressure and pumps the
fluid to the extraction points via the consumer
34
line. To do this, it is switched on and off according
to the pressure. The mechanical pressure switch is
used for monitoring the pressure in the consumer
line. When water is extracted, the pressure in the
consumer line drops. When the switch-on pres-
sure set on the pressure switch is reached, the
domestic water system is switched on. As the
extraction decreases (the extraction points are
closed), the pressure in the consumer line rises.
The domestic water system is switched off when
the switch-off pressure set on the pressure switch
is reached.
A pressure gauge installed (Figs. 1 and 2, item 5)
allows the pressure to be checked visually.
The diaphragm pressure vessel is divided into a
water and a gas space by a diaphragm. The water
space is used for holding or outputting the fluid as
the pressure in the consumer line varies. The gas in
the gas space is compressed when fluid is drawn
in, and expands again when the fluid is output.
The function of the diaphragm pressure vessel
influences the switching frequency. The fre-
quency of switching procedures decreases as the
tank volume increases.
In order to optimise the switching procedures, set
a gas supply pressure in the diaphragm pressure
vessel that is appropriate for the switch-on pres-
sure (acc. to Table 1, section 8).

7 Installation and electrical connection

7.1 Installation

The domestic water system must be installed and
operated acc. to local regulations. It must be
installed in an enclosed, dry, well ventilated room
that is protected against frost. The installation
room must be provided with floor drainage with an
adequate capacity, connected to the drainage
system of the building. Follow-on damage that
can be caused by failure of the domestic water
system, such as flooding of rooms, shall be pre-
cluded by the end-user by taking suitable meas-
ures (e.g. installing a fault signalling system or an
automatic drainage system. Inlet and pressure
pipes shall be installed on-site. The enclosed
adapter must be used to connect the inlet pipe.
CAUTION!
Risk of damaging the pump!
Foreign objects or contaminants in the pump
housing can impair the function of the product.
• We recommend completing all welding and sol-
dering work before installing the domestic
water system.
• The circuit should be flushed completely before
installing and commissioning the domestic
water system.
• Remove the screw caps on the pump housing
before installation.
WILO SE 07/2018