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5.2 Technical data
For the precise connection and performance data,
please refer to the rating plates on the pump and
the motor.
Connection and technical data
Temperature of the
fluid:
+5 °C to +35 °C
Max. ambient tem-
+40°C
perature
Suction head
Depending on the pump type/
depending on NPSH (see separate
installation and operating instructions
for the pump)
Suction connection Depending on the pump type (see
separate installation and operating
instructions for the pump)
Rp 1" to Rp 11/4"
Pressure connec-
Rp 1"
tion
Maximum operat-
Depending on the pump type (see
ing pressure
separate installation and operating
instructions for the pump)
6/8/10 bar
Mains connection
See rating plate of the pump/motor
1~230 V/50 Hz
1~220 V/60 Hz
3~230-400 V/50 Hz
3~220/380 V to 3~254/440 V/ 60 Hz
Delivery head
See rating plate
Volume flow
See rating plate
Switch-on/switch-
See rating plate
off pressure
Volume of the dia-
See rating plate
phragm pressure
vessel
Gas supply pres-
See rating plate and Table 1
sure of the dia-
(section 8.1)
phragm pressure
vessel
Weight
See rating plate
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 electrode
Installation and operating instructions Wilo domestic water systems Hxx
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 Fig. 1):
• Pump (no. 1)
• Filling screw (no. 2)
• Drainage screw (no. 3)
• Diaphragm pressure vessel (no. 4)
• Pressure gauge (no. 5)
• Mains cable with plug (EM version only) (no. 6)
• Pressure switch (no. 7)
• Flexible pressure hose (no. 8)
• Gas filling valve of the diaphragm pressure vessel
(no. 9)
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 shaft seal.
CAUTION! Danger of damage to the pump!
The pump must not run dry. Damage to the
pump due to running dry will not be covered by
the manufacturer's warranty.
To protect the domestic water system against
running dry, we recommend using appropriate
accessories such as a float switch, an additional
pressure switch or switchgear with level elec-
trodes.
CAUTION! Risk of damage to the domestic water
system!
Risk of damage due to incorrect handling during
transport and storage.
In AC motors (EM version), the thermal motor pro-
tection 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
electrically driven centrifugal pump, a pressure
switch and a diaphragm pressure vessel.
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 pump increases the pressure and pumps the
fluid to the extraction points via the consumer
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. As water consumption increases, the pressure
in the consumer line drops. When the switch-on
pressure 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.
English
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