Wilo Wilo-HiMulti 3 H Series User manual

Wilo-HiMulti 3 H...
Wilo-HMHI
Wilo-Jet HWJ
Pioneering for You
2 544 452-Ed.01 / 2016-01-Wilo
de Einbau- und Betriebsanleitung
en Installation and operating instructions
fr Notice de montage et de mise en service
nl Inbouw- en bedieningsvoorschriften
ru  Инструкцияпомонтажуиэксплуатации

Fig. 1:
L2
L2 P1
P1
82 714 9
56
3
Fig. 2:
L2
L2
P1
P1
8
2
3
7
1
4
9
5
6

Fig. 3a:
min. 500mm
1~230V /50Hz
min. 300mm
HC
HR
10
14
14
11
12
6
16

Fig. 3b:
1~230V /50Hz
min. 300mm
HR
14 11
14
13
12
14
6
11
15

Fig. 3c:
1~230V /50Hz
min. 1000mm
HR
HA
!
16
11 14
14
12
6
10

Fig. 4:
OK
Fig. 5a:

Fig. 5b:
OK
Fig. 6a: Fig. 6b:
a
e
b
c
d
a
b
e
c
d
h i
BN BU GNYE BN BU GNYE
WJ Jetson MHI Multi-H

Fig. 6c: Fig. 6d:
a
b
c
e
hi
d
BNBUL
N
GNYE
HiMulti3
Claris Home
BN BN
BU
BU
GNYE GNYE
PE NL
Fig. 7a: Fig. 7b:
a
e
b
c
d
a
b
e
k
j
dc
BK
BN
BU
BN
BK
BU
GNYE
BK BN BU GNYE BK BN BU GNYE BK BN BU GNYE

Fig. 8a: Fig. 8b:
pe [bar]
pa [bar]
pe [bar]
pa [bar]
Fig. 9a: Fig. 9b: Fig. 9c:

Fig. 10a:
16
19 19 18
19
17 19
7
BN
BN
BK
BN
BU BU
BU
GNYE
BK
BN BN
BU
BU
GNYE
BK
BN BN
BU
BU
GNYE
Fig. 10b:
16
20
7
BN
BN
BK
BU
BN
BU
BU
GNYE
BK
BK
BK
BN
BU
19
19

English
18 WILO SE 01/2016
1 General information.............................................................................................................................21
1.1 About this document............................................................................................................................................21
1.2 EC declaration of conformity ..............................................................................................................................21
2 Safety.....................................................................................................................................................21
2.1 Symbols and signal words in the operating instructions .................................................................................21
2.2 Personnel qualifications.......................................................................................................................................21
2.3 Danger in the event of non-observance of the safety instructions...............................................................21
2.4 Safety consciousness on the job.........................................................................................................................21
2.5 Safety instructions for the operator ..................................................................................................................21
2.6 Safety instructions for inspection and installation work.................................................................................22
2.7 Unauthorised modification and manufacture of spare parts...........................................................................22
2.8 Improper use .........................................................................................................................................................22
3 Transport and interim storage............................................................................................................22
4 Application (intended use) ..................................................................................................................22
5 Product information.............................................................................................................................23
5.1 Type key ................................................................................................................................................................23
5.2 Technical data .......................................................................................................................................................23
5.3 Scope of delivery ..................................................................................................................................................24
5.4 Accessories (optional)..........................................................................................................................................24
6 Description and function.....................................................................................................................24
6.1 Description of the product ..................................................................................................................................24
6.2 Function of the product.......................................................................................................................................24
7 Installation and electrical connection................................................................................................24
7.1 Installation.............................................................................................................................................................24
7.2 Electrical connection............................................................................................................................................25
8 Commissioning .....................................................................................................................................26
8.1 Check the diaphragm pressure vessel................................................................................................................26
8.2 Filling and venting ................................................................................................................................................27
8.3 Setting the pressure switch ................................................................................................................................27
8.4 Checking the direction of rotation of the motor ..............................................................................................30
8.5 Commissioning......................................................................................................................................................30
8.6 Decommissioning..................................................................................................................................................30
9 Maintenance..........................................................................................................................................30
10 Faults, causes and remedies................................................................................................................31
11 Spare parts ............................................................................................................................................32

English
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ 19
Installation and operating instructions
Captions:
Fig. 1
and 2
Set-up
1 Pump
2 Filling/venting screw plug
3 Drain screw plug
4 Diaphragm pressure vessel
5 Pressure gauge
6 Mains cable with plug (EM only)
7 Pressure switch
8 Flexible pressure hose
9 Gas filling valve
L2/P1 Spacings between fastening holes
Fig. 3a Inlet mode (tank)
6 Mains cable with plug (EM only)
10 Spring-mounted foot valve
11 Shut-off device on inlet/suction side
12 Shut-off device on the pressure side
14 Pipe attachment
16 Float switch (low water)
HC Positive suction head
HR Consumer height
Fig. 3b Inlet mode (supply network)
6 Mains cable with plug (EM only)
11 Shut-off device on inlet/suction side
12 Shut-off device on the pressure side
13 Non-return valve
14 Pipe attachment
15 Volume meter
HR Consumer height
Fig. 3c Suction mode
6 Mains cable with plug (EM only)
10 Foot valve
11 Shut-off device on inlet/suction side
12 Shut-off device on the pressure side
14 Pipe attachment
16 Float switch (low water)
HA Suction head
HR Consumer height
Fig. 4 Set-up/installation
Fig. 5a
and 5b
Lifting/Transport
Fig. 6a
and 6b
Pressure switch EM (PM)
a Adjusting screw for switch-off pressure
b Adjusting screw for pressure difference
(switch-on pressure)
c Motor cables/connections
d Network supply line/connections
e Earthing connections (PE)
h Motor connection diagram WJ (EM)
i Motor connection diagram MHI (EM)
Cable
colours
BN Brown
BU Blue
BK Black
GNYE Green-Yellow
Fig. 6c Pressure switch EM (PM) – HiMulti3 pump
a Adjusting screw for switch-off pressure
b Adjusting screw for pressure difference
(switch-on pressure)
c Motor cables/connections
d Network supply line/connections
e Earthing connections (PE)
h Motor terminal box (HiMulti3)
i Quick-Connector connection (HiMulti3)
Cable
colours
BN Brown
BU Blue
BK Black
GNYE Green-Yellow
Fig. 6d Connect cable for Quick-Connector HiMulti3
Fig. 7a
and 7b
Pressure switch DM (type PT)
a Adjusting screw for switch-off pressure
b Adjusting screw for pressure difference
(switch-on pressure)
c Motor supply lines/connections
d Network supply line/connections “LINE”
(to be provided by the customer)
e Earthing connections (PE)
j Motor connection diagram DM (3~400 V)
k Motor connection diagram DM (3~230 V)
Cable
colours
BN Brown
BU Blue
BK Black
GNYE Green-Yellow
Fig. 8a
and 8b
Pressure switch diagrams
Fig. 8a Pressure switch PM5/PT5
Fig. 8b Pressure switch PM12/PT12
po
[bar]
Switch-off pressure
pi [bar] Start-up pressure
Fig. 9a
to 9c
Checking gas supply pressure for diaphragm
pressure vessel
Fig. 9a Depressurise system
Fig. 9b Remove valve flap
Fig. 9c Measure gas supply pressure

Fig. 10a HWJ/HMHI Version EM connection diagram for
optional float switch (low water cut-out switch)
7 Pressure switch
16 Optional float switch
17 Motor terminal box WJ…/EM
18 Motor terminal box MHI…/EM
19 Additional connection terminals
Cable
colours
BN Brown
BU Blue
BK Black
GNYE Green-Yellow
Fig. 10b HiMulti3 connection diagram for optional float
switch (low water cut-out switch)
7 Pressure switch
16 Optional float switch
19 Additional connection terminals
20 HiMulti3 motor terminal box with
Quick-Connector
Cable
colours
BN Brown
BU Blue
BK Black
GNYE Green-Yellow
English
20 WILO SE 01/2016

English
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ 21
1 General information
1.1 About this document
The language of the original operating instructions is
German.Allotherlanguagesoftheseinstructionsare
translations of the original operating instructions.
These installation and operating instructions are
an integral part of the product. They must be kept
readily available at the place where the product is
installed. Strict adherence to these instructions is
a precondition for the proper use and correct
operation of the product.
These installation and operating instructions cor-
respond to the relevant version of the product and
the underlying safety standards valid at the time
of going to print.
1.2 EC declaration of conformity
A copy of the EC declaration of conformity is a
component of these operating instructions. If a
technical modification is made on the designs
named there without our agreement or the decla-
rations made in the installation and operating
instructions on product/personnel safety are not
observed, this declaration loses its validity.
2 Safety
These operating instructions contain basic infor-
mation which must be adhered to during installa-
tion and operation. For this reason, these operating
instructions must, without fail, be read by the serv-
ice technician and the responsible operator before
installation and commissioning. It is not only the
general safety instructions listed under this
“Safety” section that must be adhered to but also
the special safety instructions with danger symbols
included under the following sections.
2.1 Symbols and signal words in the operating
instructions
Symbols:
General danger symbol
Danger due to electrical voltage
NOTE: ...
Signal words:
DANGER!
Acutely dangerous situation.
Non-observance results in death or the most
serious of injuries.
WARNING!
The user can suffer (serious) injuries. ‘Warning’
implies that (serious) injury to persons is proba-
ble if this information is disregarded.
CAUTION!
There is a risk of damaging the product/unit.
‘Caution’ implies that damage to the product
is likely if this information is disregarded.
NOTE:
Useful information on handling the product.
It draws attention to possible problems.
Information that appears directly on the product,
such as:
• Direction of rotation arrow,
• Identifiers for connections,
• Rating plate,
• Warning sticker,
must be strictly complied with and kept in legible
condition.
2.2 Personnel qualifications
The installation, operating and maintenance per-
sonnel must have the appropriate qualifications for
this work. Area of responsibility, terms of reference
and monitoring of the personnel are to be ensured
by the operator. If the personnel are not in posses-
sion of the necessary knowledge, they are to be
trained and instructed. This can be accomplished, if
necessary, by the manufacturer of the product at
the request of the operator.
2.3 Danger in the event of non-observance of the
safety instructions
Non-observance of the safety instructions can
result in risk of injury to persons and damage to
the environment and the product/unit. Non-
observance of the safety instructions results in
the loss of any claims to damages.
In detail, non-observance can, for example, result
in the following risks:
• Danger to persons due to electrical, mechanical
and bacteriological factors
• Damage to the environment due to leakage of
hazardous materials
• Property damage
• Failure of important product/unit functions
• Failure of required maintenance and repair procedures
2.4 Safety consciousness on the job
The safety instructions included in these installa-
tion and operating instructions, the existing
national regulations for accident prevention
together with any internal working, operating and
safety regulations of the operator are to be com-
plied with.
2.5 Safety instructions for the operator
This appliance is not intended for use by persons
(including children) with reduced physical, sensory
or mental capabilities, or lack of experience and
knowledge, unless they have been given supervi-
sion or instruction concerning use of the appliance
by a person responsible for their safety.
Children should be supervised to ensure that they
do not play with the appliance.

English
22 WILO SE 01/2016
If hot or cold components on the product/unit lead
to hazards, local measures must be taken to guard
these components against touching.
• Guards protecting against touching moving com-
ponents (such as the coupling) must not be
removed whilst the product is in operation.
• Leakages (e.g. from a shaft seal) of hazardous flu-
ids (e.g. explosive, toxic or hot) must be conveyed
away so that no danger to persons or to the envi-
ronment arises. National statutory provisions are
to be complied with.
• Highly flammable materials are always to be kept
at a safe distance from the product.
• Danger from electrical current must be eliminated.
Local directives or general directives (e.g. IEC, VDE
etc.) and instructions from local energy supply com-
panies must be adhered to.
2.6 Safety instructions for inspection and
installation work
The operator must ensure that all installation and
maintenance work is carried out by authorised and
qualified personnel, who are sufficiently informed
from their own detailed study of the installation
and operating instructions.
Work on the product/unit must only be carried out
when at a standstill. It is mandatory that the pro-
cedure described in the installation and operating
instructions for shutting down the product/unit
be complied with.
Immediately on conclusion of the work, all safety
and protective devices must be put back in posi-
tion and/or recommissioned.
2.7 Unauthorised modification and manufacture of
spare parts
Unauthorised modification and manufacture of
spare parts will impair the safety of the product/
personnel and will make void the manufacturer’s
declarations regarding safety.
Modifications to the product are only permissible
after consultation with the manufacturer. Original
spare parts and accessories authorised by the
manufacturer ensure safety. The use of other
parts will absolve us of liability for consequential
events.
2.8 Improper use
The operating safety of the supplied product is
only guaranteed for conventional use in accord-
ance with section 4 of the operating instructions.
The limit values must on no account fall under or
exceed those values specified in the catalogue/
data sheet.
3 Transport and interim storage
When you receive the domestic water system,
immediately check it for transport damage. If you
discover transport damage, discuss with the cou-
rier company what measures to take, complying
with the relevant notification deadlines!
CAUTION! Risk of property damage!
Incorrect transport and interim storage can
cause damage to the product.
The domestic water system should be protected
from moisture, frost and mechanical damage due
to impact during transport and interim storage.
The domestic water system must never be exposed
to temperatures outside the range - 10 °C to + 50 °C
during transport or storage.
4 Application (intended use)
Domestic water systems are designed to pump
rain and process water and serve to pump water
from tanks, ponds, streams and wells for water
supply, irrigation, sprinkling and spraying in
domestic applications.
A direct connection to the public drinking water net-
work for drinking water supply is not permissible.
Non-self-primingor self-priming pumps are used,
depending on the application.
Non-self-priming pumps (HiMulti3; MHI) must run
in inlet mode (e.g. higher tank Fig. 3a or mains
Fig. 3b), as they are not capable of evacuating air
from the inlet pipe.
Self-priming pumps (HiMulti3-P; WJ) can evacuate
air from the inlet pipe via air extraction technology.
As a result, they are suitable for pumping from ves-
sels in lower positions (e.g. from a well or cistern).
Permitted fluids:
• Water without any solids or settling sediments
(process water, refrigerating water, cooling water
and rainwater)
Use with other fluids or additives requires
approval from Wilo.
DANGER!
Risk of explosion! This domestic water system
must not be used to pump flammable or explo-
sive fluids.

English
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ 23
5 Product information
5.1 Type key
Example: HiMulti3H50-24P
HiMulti3
Pump type
= Wilo-HiMulti3
H= Domestic water system
20
50
100
Tank volume
= 20-litre tank
= 50-litre tank
= 100-litre tank
2
4
= Rated volume flow Q in m³/h at optimum
efficiency
3
4
5
= Number of stages
հ
P
Pump type
= Non-self-priming pump
(no designation)
= Self-priming pump
Example: HWJ-204-EM-50
H= Domestic water system with pump
WJ
Pump type
= Wilo-Jet
2= Rated volume flow Q in m³/h at optimum
efficiency
02
03
04
Power classification of motor P1 (in W)
= 890 W
= 1100 W
= 1300 W
EM
DM
= Alternating current 1~230 V
= Three-phase current 3 ~ 400 V
հ
50
= 20-litre tank
(no additional designation)
= 50-litre tank
Example: HMHI-403-EM
H= Domestic water system with pump
MHI
Pump type
= Wilo-Economy MHI
2
4
= Rated volume flow Q in m³/h at optimum
efficiency
02
03
04
05
06
= Number of stages
EM
DM
= Alternating current 1~230 V
= Three-phase current 3 ~ 400 V
5.2 Technical data
Forthepreciseconnectionandtechnicaldata,please
refer to the rating plates on the pump and the motor.
Connection and technical data
Hydraulic data
Delivery head See rating plate
Volume flow See rating plate
Switch-on/switch-
off pressure
See rating plate
Maximum operat-
ing pressure
Depending on the pump type (see sep-
arate installation and operating instruc-
tions and rating plate for the pump)
6/8/10 bar
Volume of the dia-
phragm pressure
vessel
See rating plate
Gas supply pres-
sure for diaphragm
pressure vessel
See rating plate and Table 1
Maximum height
above sea level
1000 m
Suction head Depending on the pump type / depend-
ing on NPSH (see separate installation
and operating instructions for the pump)
Suction connec-
tion
HiMulti3-…
WJ 2..
MHI 2..
MHI 4…
Depending on the pump type (see
separate installation and operating
instructions for the pump)
G1 (female thread) DIN ISO 228 T1
Adapter with male thread on both sides
in the accessories kit
G1 (female thread) DIN ISO 228 T1
G1 (female thread) DIN ISO 228 T1
G1¼(female thread) DIN ISO 228 T1
Pressure connection Rp1 (female thread DIN 2999 or ISO 7/1)
Temperature range
Temperatureof the
fluid
+ 5 °C to + 35 °C
Max. ambient tem-
perature
+ 40 °C
Electrical data
Mains connection See rating plate of pump/motor
1~230 V/50 Hz
1~220 V/60 Hz
3~230/400 V/50 Hz
3~220/380 V
up to 3~254/440 V/60 Hz
Protection class IPX4 (see the installation and operat-
ing instructions for the pump)
Motor insulation
class
F (155 °C) (see the installation and
operating instructions for the pump)
Weight See rating plate
Dimensions, other
Distances between
holes for attachment
L2 x P1
(Fig. 1 and 2)
20 litre tank Ô170 x 230 mm
50 litre tank Ô235 x 253 mm
100 litre tank Ô310 x 248 mm
Fastening screws required 4 x Ø8 mm (20 L and 100 L tank)
or 4 x Ø6 mm (50 L tank)
See dimension drawing/catalogue/data sheet for further
dimensions

English
24 WILO SE 01/2016
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
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.

English
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ 25
In case of fixed or stationary installation, the domes-
tic water system shall be attached to the floor on-
site. The installation surface must be horizontal and
flat. Space shall be allowed for maintenance work.
NOTE:
Never install the domestic water system on an
uneven bearing surface!
To avoid structure-borne noise transmission, the
domestic water system must be connected to the
suction and pressure pipes via flexible hose
adapters. Threaded pipe unions which can be
opened must be used for this.
In case of additional on-site attachment to the
ground, make sure that suitable measures are pro-
vided in order to avoid structure-borne noise
transmission (e.g. by a cork pad, vibration absorb-
ers or the like). To fasten the domestic water sys-
tem to the floor, appropriate holes are provided
(for 4 Ø6 mm (50 L) or Ø8 mm screws (20 L and
100 L) – not included in the scope of delivery) on
the installation feet (see Fig. 1 and 2 and the table
of connection and technical data in Section 5.2).
7.1.1 Domestic water system (Fig. 3a and 3b)
A non-self-priming pump is supplied with water via
the inlet connection (see Fig. 3a and 3b). The water
supply can come from a higher tank (Fig. 3a) or a
water supply network (Fig. 3b).
CAUTION!
In order to guarantee correct operation, the
pumps require a water supply of at least
300 mm, i.e. the first extraction point in the
consumer line must be installed at least 300 mm
above the pump.
Suitable stop valves shall be installed in the inlet
pipe and the consumer line (Fig. 3a and 3b,
item 11/12). The inlet pipe shall be provided with
a non-return valve (Fig. 3b, item 13) or a spring-
mounted foot valve (Fig. 3a, item 10). The diame-
ter of the inlet pipe must not be less than the
diameter of the pump's suction connection.
To avoid stresses being communicated by the
weight of the piping, the piping must be secured
to the structure using suitable attachment devices
(Fig. 3a and 3b, item 14).
7.1.2 Domestic water system in suction mode
(Fig. 3c)
With a self-priming pump or a non-self-priming
pump operating in suction mode from tanks at a
lower level, it is necessary to install a separate,
vacuum and pressure-resistant inlet pipe with
foot valve (Fig. 3c). This must be installed contin-
uously rising from the tank to the pump connec-
tion on the suction side. The foot valve shall be
positioned so as to achieve a distance of 100 mm
from the base of the tank and a minimum water
coverage of 200 mm at the lowest possible water
level.
Use of a suction hose set (comprising a suction
hose and foot valve) is always recommended.
A floating extractor should be installed in order to
prevent coarse contaminants being sucked in
from the base area of the container.
Suitable stop valves shall be installed in the con-
sumer line (Fig. 3c, item 12).
All connection lines shall be installed on the system
without tension, using detachable connections.
The weight of the connection lines must be secured
to the building structure using suitable attachment
devices (Fig. 3c, item 14).
7.2 Electrical connection
WARNING! Risk of electric shock!
• Dangers from electricity must be ruled out.
• Electrical work may only be carried out by a
qualified electrician authorised by the local
electricity supply company and in accordance
with the applicable local regulations (e.g. VDE
regulations).
• Before any electric connection must be discon-
nected from the power supply (switched off)
and protected against unauthorised reactiva-
tion.
• In order to ensure safe installation and opera-
tion, the unit must be earthed correctly with the
earth terminals of the power supply.
CAUTION!
Defects in the electrical connection damage the
motor.
The power cable should never be allowed to
come into contact with either the pipe or the
pump. Furthermore, it must be completely
shielded against moisture.
We recommend connecting the domestic water
system via a residual-current device (Fl switch).
The appropriate regulations acc. to VDE 0100 Part
702 shall be complies with for use in swimming
pools and garden ponds.
Mains connection:
• EM version: Connection via connection cable with
plug (Fig. 1 to 3, item 6, installed ex-works in
accordance with the connection diagram Fig. 6a to
6d, depending on the pump used)
• DM version: Connection by on-site connection
cable (for diagram, see Fig. 7b)
• The cover of the pressure switch must be
removed for this purpose (Fig. 7).
• A four-core cable must be routed to the “LINE”
terminals (phases) and the earthing connection
(green/yellow).
• The domestic water system must only be oper-
ated with an electrical connection cable (includ-
ing extension cable) which has at least a rubber
sheath of type H07 RNF acc. to DIN 57282 or
DIN 57245.

English
26 WILO SE 01/2016
• The domestic water system is prepared for con-
nection to a 3~400 V mains ex works. If con-
nected to a mains with 3~230 V, the terminal
bridges in the motor's terminal box must be
reset accordingly before establishing the mains
connection (Fig. 7b, item j and k).
The electrical plug connections shall be installed
where they are protected against overflowing
water and against moisture. The electrical system
shall be installed acc. to the specifications in the
corresponding installation and operating instruc-
tions. The technical data of the circuits to be con-
nected must be checked to ensure compliance with
the electrical data of the domestic water system.
Observe the rating plate data of the pump motor
for this.
The mains fuse shall be a 10 A slow-blow fuse.
DANGER! Risk of fatal injury!
As a protective measure, the electrical system
must be earthed correctly (i.e. in accordance with
the local regulations and conditions. Connections
provided for this purpose are marked accordingly
(earth terminal on motor).
NOTE:
Never lift, transport or secure the domestic water
system by the mains connection cable. Do not
spray water directly at the pump.
Damaged cables or plugs must be replaced with
the corresponding spare parts by the manufac-
turer or the manufacturer's customer service. The
electrical connection must be made in accordance
with the (Fig. 6/7).
Only for EM version:
When using an additional float switch, for example
for switching off in case of low water, it must be
connected according to the diagram (Fig. 10a or
10b, item 3).
8 Commissioning
To avoid the pump running dry, it is necessary to
check before commissioning that there is enough
water in the open supply container or the well, or that
the supply pressure in the inlet pipe is at least 0.5 bar.
If a float switch or electrodes are used for protect-
ing against running dry, they must be positioned
so that the domestic water system switches off at
a water level which would result in air being
sucked in.
CAUTION!
The pump must not be allowed to run dry. Dry
running, even for a short period, can result in
damage to the mechanical seal. Damage to the
pump due to running dry will not be covered by
the manufacturer's warranty.
The system must be filled with water before start-
ing the domestic water system (section 8.2).
8.1 Check the diaphragm pressure vessel
In order for the domestic water system to operate
correctly, it is necessary to have a gas supply pres-
sure in the diaphragm pressure vessel that is
appropriate for the switch-on pressure. In the fac-
tory setting, the gas space of the diaphragm pres-
sure vessel is filled with nitrogen and set to a
particular supply pressure (see rating plate). The
gas pressure should be checked again before
commissioning and after changes to the pressure
switch settings. For this purpose, the domestic
water system must be de-energised and the dia-
phragm pressure vessel depressurised on the
water side. The gas supply pressure shall be
checked at the gas filling valve of the diaphragm
pressure vessel (Fig. 1 and 2, item 9) by means of
an air pressure gauge (Figs. 9a to 9c)
WARNING! Risk of suffocation by nitrogen!
Measuring, replenishing and venting of nitrogen
at the diaphragm pressure vessel is only allowed
to be performed by qualified specialist personnel.
WARNING! Danger of injury!
Excessive gas supply pressure can lead to
destruction of the diaphragm pressure vessel.
The maximum permitted operating pressure on
the rating plate must not be exceeded. Monitor
the gas supply pressure by measuring during the
filling procedure. When measuring instruments
with different scale divisions (unit of dimension)
are used, it is essential to comply with the
instructions for converting! Comply with the
general safety regulations for working with
pressure vessels.
The value of the gas supply pressure (PN2) should
be approx. the pump switch-on pressure (pI)
less 0.2-0.5 bar (or pump switch-on pressure less
10%) (see Table 1)!
If the gas supply pressure is too low, it must be cor-
rected by replenishing gas. When replenishing, we
recommend using nitrogen because this gas mini-
mises the risk of corrosion in the tank, as well as pre-
venting losses through diffusion. If the gas supply
pressure is too high, correct it by venting gas from
the valve.
pI
[bar] 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
PN2
[bar] 1.8 2.3 2.8 3.2 3.7 4.2 4.7 5.2 5.7 6.1 6.6 7.1 7.5 8 8.5 9 9.5
Table 1:
Gas supply pressure PN2 diaphragm pressure ves-
sel in relation to the switch-on pressure pI
Conversion of pressure units:
1 bar = 100000 Pa = 0.1 MPa = 0.1 N/mm²
= 10200 kp/m² = 1.02 kp/cm² (at)
1 bar = 0.987 atm = 750 Torr = 10.2 m/Ws

English
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ 27
8.2 Filling and venting
Only a completely filled pump without air inclusions
can draw in fluid optimally. Perform filling and vent-
ing as follows:
a) Pump with inlet pressure (Fig. 3b)
• Close stop valve on the pressure side (Fig. 3b,
item 12)
• Loosen the screw plug for filling/venting (Fig. 1
or 2, item 2).
• Slightly open stop valve on the inlet side (Fig. 3b,
item 11), until water emerges from the filler open-
ing and the pump is completely vented.
WARNING!
There is a risk of scalding! Depending on the
temperature of the fluid and system pressure,
hot liquid or gaseous fluid may escape or shoot
out at high pressure when the vent plug is
opened completely.
• Screw the screw plug back in tightly when the
water emerges free from bubbles.
• Open the stop valve on the pressure side
(Fig. 3b, item 12).
• Continue commissioning with the pressure
switch setting.
b) Self-priming pump in suction mode (Fig. 3c)
(maximum suction head 8 m)
• Open shut-off device on the pressure side
(Fig. 3c, item 12).
• Open shut-off device on the suction side
(Fig. 3c, item 11).
• Remove the screw plug for filling/venting (Fig. 1
or 2, item 2).
• Using a funnel, slowly and completely fill the
pump at the filler opening, until water emerges
from the opening (Fig. 3c).
• Screw the screw plug back in tightly when the
water emerges free from bubbles.
• Continue commissioning with the pressure
switch setting.
WARNING!
The entire system can get very hot, depending
on the operating status of the domestic water
system (temperature of the fluid) Risk of burns
on contact!
NOTE:
The pump is not allowed to be operated for more
than 10 minutes with volume flow Q = 0 m3/h
(closed stop valve).
c) Self-priming pump in suction mode (Fig. 3c)
(maximum suction head 7 m)
• Open shut-off device on the pressure side
(Fig. 3c, item 12).
• Open shut-off device on the suction side
(Fig. 3c, item 11).
• Remove the screw plug for filling/venting (Fig. 1
and 2, item 2).
• Using a funnel, slowly and completely fill the
pump at the filler opening, until water emerges
from the opening.
• Screw the screw plug back in tightly when the
water emerges free from bubbles.
• Start the domestic water system for a short
period (approx. 20 sec.) so that the air will col-
lect in the pump housing.
• Switch off the domestic water system.
• Repeat the filling procedure until the pump and
inlet pipe have been completely vented.
• Continue commissioning with the pressure
switch setting.
WARNING!
The entire system can get very hot, depending
on the operating status of the domestic water
system (temperature of the fluid). Risk of burns
on contact!
NOTE:
The pump is not allowed to be operated for more
than 10 minutes with volume flow Q = 0 m3/h
(closed stop valve).
8.3 Setting the pressure switch
NOTE:
The switch-on and switch-off pressures of the
pressure switch have been factory-set according
to the pump curve of the pump used (see rating
plate).
To adapt to local conditions, it is possible to
change or adapt the settings of the pressure
switch as follows.
The switch-off pressure (adjusting screw
Fig. 6a/6b or 6c/6d, item a) and the pressure dif-
ference (adjusting screw Fig. 6a/6b or 6c/6d,
item b) are set in relation to the switch-on pres-
sure at the pressure switch (EM version).
The switch-off pressure (adjusting screw
Fig. 7a/7b, item a) and the pressure difference
(adjusting screw Fig. 7a/7b, item b) are set in rela-
tion to the switch-on pressure at the pressure
switch (DM version).
The following diagram describes the procedure for
setting the pressure switches.