Wilo Rexa MINI3-V-A Series User manual

Pioneering for You
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Wilo-Rexa MINI3
3094116 • Ed.02/2021-01
en Installation and operating instructions

en
Installation and operating instructions Wilo-Rexa MINI3 3
Table of contents
1 Safety......................................................................................................................................................................................... 5
1.1 About these instructions ...........................................................................................................................................................5
1.2 Identification of safety instructions.........................................................................................................................................5
1.3 Personnel qualifications.............................................................................................................................................................5
1.4 Fluids hazardous to health.........................................................................................................................................................6
1.5 Personal protective equipment.................................................................................................................................................6
1.6 Transport and storage ................................................................................................................................................................6
1.7 Installation....................................................................................................................................................................................6
1.8 Electrical connection ..................................................................................................................................................................6
1.9 During operation .........................................................................................................................................................................6
1.10 Removal ........................................................................................................................................................................................6
1.11 Clean and disinfect......................................................................................................................................................................7
1.12 Maintenance tasks ......................................................................................................................................................................7
1.13 Commercial use ...........................................................................................................................................................................7
1.14 Operating fluid.............................................................................................................................................................................7
2 Product description and function ........................................................................................................................................... 7
2.1 Description...................................................................................................................................................................................7
2.2 Technical data..............................................................................................................................................................................8
2.3 Type key .......................................................................................................................................................................................8
2.4 Scope of delivery.........................................................................................................................................................................9
2.5 Functions......................................................................................................................................................................................9
3 Application/use......................................................................................................................................................................... 9
3.1 Intended use ................................................................................................................................................................................9
3.2 Improper use ................................................................................................................................................................................9
4 Transport and storage.............................................................................................................................................................. 9
5 Installation and electrical connection .................................................................................................................................. 10
5.1 Installation types...................................................................................................................................................................... 10
5.2 Installation................................................................................................................................................................................. 10
5.3 Electrical connection ............................................................................................................................................................... 11
6 Commissioning........................................................................................................................................................................ 12
6.1 Before activating...................................................................................................................................................................... 12
6.2 Switching on and off................................................................................................................................................................ 12
6.3 Test run...................................................................................................................................................................................... 12
6.4 During operation ...................................................................................................................................................................... 13
7 Removal ................................................................................................................................................................................... 13
7.1 Stationary wet well installation.............................................................................................................................................. 13
7.2 Portable wet well installation................................................................................................................................................. 13
8 Cleaning ................................................................................................................................................................................... 13
8.1 Clean pump ............................................................................................................................................................................... 14
8.2 Cleaning the pump interior..................................................................................................................................................... 14
9 Maintenance............................................................................................................................................................................ 14

en
4 WILO SE 2021-01
9.1 Operating fluid.......................................................................................................................................................................... 14
9.2 Oil change.................................................................................................................................................................................. 15
9.3 General overhaul ...................................................................................................................................................................... 15
10 Faults, causes and remedies .................................................................................................................................................. 15
11 Spare parts............................................................................................................................................................................... 16
12 Disposal.................................................................................................................................................................................... 16
12.1 Information on the collection of used electrical and electronic products....................................................................... 16
12.2 Oil ............................................................................................................................................................................................... 16

Safety en
Installation and operating instructions Wilo-Rexa MINI3 5
1 Safety
1.1 About these instructions
These instructions form part of the product.
Compliance with the instructions is essential
for correct handling and use:
ƒRead the instructions carefully before all
activities.
ƒKeep the instructions in an accessible place
at all times.
ƒPass the instructions on to a subsequent
owner.
ƒObserve all product specifications.
ƒObserve the markings on the product.
Failure to follow the instructions will result in:
ƒDanger to persons or damage to property.
ƒThe loss of claims for damages.
The creation language of the instructions is
German. All other languages are a translation.
A digital version of the installation and operat-
ing instructions can be downloaded from the
following product page: http://qr.wilo.com/405
1.2 Identification of safety instructions
In these installation and operating instructions,
safety instructions are displayed as follows:
ƒDanger to persons: Safety instructions are
preceded by a corresponding symbol and
are shaded in grey.
ƒDamage to property: Safety instructions start
with a signal word and are displayed without
a symbol.
Signal words
ƒDANGER!
Failure to follow the instructions will result in
serious injuries or death!
ƒWARNING!
Failure to follow the instructions can lead to
(serious) injury!
ƒCAUTION!
Failure to follow the instructions can lead to
potentially irreparable property damage.
ƒNOTICE!
Useful information on handling the product
Symbols
These instructions use the following symbols:
Danger caused by electric
voltages
Danger of explosion
Warning– risk of cuts and similar
injuries
Warning - risk of health damage
Personal protective equipment:
wear protective gloves
Personal protective equipment:
wear face mask
Personal protective equipment:
wear safety goggles
Useful information
1.3 Personnel qualifications
ƒPersons aged 16 and over
ƒHave read and understood the installation
and operating instructions
Children and persons with limited abilities in the
household
This device can be used by children from
8years of age as well as people with reduced
physical, sensory or mental capacities or lack of
experience and knowledge if they are super-
vised or instructed on the safe use of the
device and they understand the dangers that
can occur. Children are not allowed to play with
the device. Cleaning and user maintenance
must not be carried out by children without su-
pervision.

en Safety
6 WILO SE 2021-01
1.4 Fluids hazardous to health
In stagnant water (e.g. pump sump, soakaway,
etc.) germs which are hazardous to health can
form. There is a danger of bacterial infections!
ƒClean and disinfect the product thoroughly
after removal!
ƒInform all persons about the pumped fluid
and the danger it poses!
1.5 Personal protective equipment
Wear the following protective equipment dur-
ing transport, installation, removal and main-
tenance:
ƒSafety shoes: Protection class S1 or P1
ƒProtective gloves (EN388): Category II,
marking 3131X
Wear the following protective equipment dur-
ing cleaning operations:
ƒProtective gloves (ENISO374-1): Category
C
ƒSafety goggles (EN166): uvex skyguard NT
(Identification marking: W 166 34 F CE)
ƒBreathing protection mask (EN149): 3M
Series 6000 with filter 6055 A2
1.6 Transport and storage
ƒWear protective equipment!
ƒAlways carry the product by the handle.
Never carry or pull on the connection cable!
ƒClean product and disinfect if necessary!
–Dirt fosters the formation of germs.
–Encrustations may lead to the impeller be-
coming blocked.
1.7 Installation
ƒWear protective equipment!
ƒDo not install damaged or defective
products.
ƒIf there is a risk of germ formation, observe
the following points:
–Ensure sufficient air exchange.
–Wear a breathing protection mask e.g. 3M
Series 6000 with filter 6055 A2
1.8 Electrical connection
ƒDo not connect products with a damaged
connection cable! Have the connection cable
replaced by a qualified electrician or the cus-
tomer service.
ƒMains connection with correctly installed
protective earth conductor.
ƒInstall the residual-current device (RCD) with
30mA.
ƒFuse protection at mains connection: max.
16A.
ƒProduct without plug: Electrical connection
must be carried out by a qualified electrician!
1.9 During operation
ƒThe pumping of highly inflammable and ex-
plosive fluids (petrol, paraffin, etc.) in their
pure form is strictly prohibited!
ƒIf persons come into contact with the
pumped fluid (accessible basins*), do not
commission the product.
*Definition of “accessible basins”
Installation sites that can be walked on and
directly accessed without tools (e.g. ladders):
ƒGarden ponds
ƒPaddling pools
ƒCesspools
ƒFountains, etc.
NOTICE!The specifications applicable to
swimming pools also apply to accessible
basins.
1.10 Removal
ƒWear protective equipment!
ƒProduct without plug: Have the connection
cable disconnected from the mains by a
qualified electrician.
ƒDepending on the operating mode and dura-
tion, the housing parts become hotter than
40°C (104°F).
–Only touch the product by the carrying
handle.
–Allow product to cool down.
ƒClean the device thoroughly.

Product description and function en
Installation and operating instructions Wilo-Rexa MINI3 7
ƒIf there is a risk of germ formation, observe
the following points:
–Ensure sufficient air exchange.
–Wear a breathing protection mask e.g. 3M
Series 6000 with filter 6055 A2
–Disinfect product.
1.11 Clean and disinfect
ƒWear protective equipment!
The protective equipment prevents contact
with germs that are hazardous to health and
the disinfectant.
ƒIf a disinfectant is used, follow the manufac-
turer's instructions!
–Wear protective equipment according to
the manufacturer's instructions! If in
doubt, ask your specialist dealer.
–Inform all persons about the disinfectant
and how to use it correctly!
1.12 Maintenance tasks
ƒWear protective equipment!
ƒCarry out maintenance work in a clean, dry
and well-lit place.
ƒOnly original parts of the manufacturer may
be used. The use of any non-original parts
releases the manufacturer from any liability.
ƒCollect any leakage of fluid and operating
fluid immediately.
1.13 Commercial use
The product is intended for domestic use. The
instructions therefore refer only to the do-
mestic use of the product.
The product is also suitable for commercial ap-
plications. The following must be observed as
regards commercial use:
ƒThese installation and operating instructions
do not contain the necessary information for
commercial use.
ƒThe staff is trained in the operation of com-
mercial wastewater facilities.
ƒThe operator is responsible for ensuring that
the product meets the necessary require-
ments.
ƒThe product is not suitable for the following
applications:
–Frequency converter operation
–Operation on soft start control
–Operation within potentially explosive at-
mospheres
1.14 Operating fluid
The oil is located in the sealing chamber. It
serves to lubricate the seal on the motor and
pump side.
ƒAbsorb leakages immediately.
ƒIf major leakages occur, contact customer
service.
ƒIf the seal is defective, the oil enters the
pumped fluid and the sewer.
ƒCollect waste oil by type (unmixed) and dis-
pose of it in accordance with regulations at a
certified collection point.
ƒSkin contact: Rinse skin areas thoroughly
with soap and water. If skin irritation occurs,
consult a doctor.
ƒContact with eyes: Remove the contact
lenses. Rinse eye thoroughly with water. If
eye irritation occurs, consult a doctor.
ƒIngestion: In general, no treatment is neces-
sary. If larger amounts have been swallowed,
consult a doctor.
2 Product description and function
2.1 Description
Submersible pump for stationary and portable wet well in-
stallation in intermittent operation.
1
2
3
4
5
6
Fig.1: Overview

en Product description and function
8 WILO SE 2021-01
1 Handle
2 Motor housing
3 Discharge connection
4 Pump housing
5 Float switch
6 Connection cable
Rexa MINI3-V...-P
Sewage pump with vortex impeller and vertical threaded
connection. Hydraulics housing made of grey cast iron, im-
peller made of plastic. Surface-cooled 1~ motor with in-
tegrated operating capacitor and self-switching thermal
motor monitoring. Stainless steel motor housing. Oil-filled
sealing chamber with double sealing: a rotary shaft seal is
installed on the motor side, a mechanical seal on the pump
side. Detachable connection cable with fitted shockproof
plug.
Rexa MINI3-V...-A
Sewage pump with vortex impeller and vertical threaded
connection. Hydraulics housing made of grey cast iron, im-
peller made of plastic. Surface-cooled 1~ motor with in-
tegrated operating capacitor and self-switching thermal
motor monitoring. Stainless steel motor housing. Oil-filled
sealing chamber with double sealing: a rotary shaft seal is
installed on the motor side, a mechanical seal on the pump
side. Detachable connection cable with float switch and
fitted shockproof plug.
Rexa MINI3-V...-O
Sewage pump with vortex impeller and vertical threaded
connection. Hydraulics housing made of grey cast iron, im-
peller made of plastic. Surface-cooled 3~ motor with self-
switching thermal motor monitoring. Stainless steel motor
housing. Oil-filled sealing chamber with double sealing: a
rotary shaft seal is installed on the motor side, a mechan-
ical seal on the pump side. Detachable connection cable
with bare cable end, for fixed connection to on-site con-
trols. NOTICE!Pump without float switch and plug!
2.2 Technical data
Date of manufacture See rating plate1)
Mains connection See rating plate
Rated power See rating plate
Max. delivery head See rating plate
Max. volume flow See rating plate
Activation type See rating plate
Speed See rating plate
Discharge connection* G 1½ IG
Operating mode, immersed S1
Operating mode, non-im-
mersed
S3 20% 2)
Fluid temperature 3...+40°C (37...104°F)
Fluid temperature, short-
term for 3min
--
Max. immersion depth, 5m
(16.5ft) connection cable
2m (6.5ft)
Max. immersion depth,
10m (33ft) connection
cable
7m (23ft)
Protection class IP68
Insulation class F
Max. switching frequency /h 30/h
Key
* IG = female thread, AG = male thread
1) Information according to ISO8601
2) 2 min operation, 8min standby
2.3 Type key
Ex-
ample:
Wilo-Rexa MINI3-V04.11/M06-523/A-5M
Rexa Submersible sewage pump
MINI3 Series
VVortex impeller
04 Nominal diameter discharge connection G1½IG
11 Max. delivery head in m
MMains connection version:
ƒM = single-phase current (1~)
ƒT = three-phase current (3~)
06 Value/10 = rated power P2 in kW
5Mains frequency:
ƒ5 = 50Hz
ƒ6 = 60Hz
23 Rated voltage code
AAdditional electrical equipment:
ƒO = with bare cable end
ƒP = with plug
ƒA = with plug and float switch
5M Connection cable length

Application/use en
Installation and operating instructions Wilo-Rexa MINI3 9
2.4 Scope of delivery
ƒPump
ƒInstallation and operating instructions
2.5 Functions
2.5.1 Self-switching thermal motor monitoring
If the motor becomes too hot, the pump is deactivated.
After the motor has cooled down, the pump is automatical-
ly switched on again.
2.5.2 Float switch
The Rexa MINI3-V...-A is equipped with a float switch. The
float switch is used to switch the pump on and off depend-
ing on the level:
ƒUpper floater: Pump on
ƒLower floater: Pump off
3 Application/use
3.1 Intended use
For the pumping in domestic areas of:
ƒSewage not containing faeces
–Wash basins
–Shower basins/bathtubs
–Washing machines
ƒWastewater (with small amounts of sand and gravel)
–Rainwater
–Drainage water
Use inside and outside buildings
NOTICE
For use inside buildings only
Use pumps with a connection cable less than
10m (33ft) long only inside buildings. Use
outside buildings is prohibited!
Pump type
Connection cable length Outdoor applica- tion Indoor application
Rexa MINI3-V...-5M 5m (16.5ft) — •
Rexa MINI3-V...-10M 10m (33ft) • •
Key:
— = Not permitted, • = Permitted
3.2 Improper use
DANGER
Explosion due to pumping of explosive
fluids!
Pumping of highly flammable and explosive
fluids (gasoline, kerosene, etc.) in pure form is
strictly prohibited. There is a risk of fatal injury
due to explosion! The pumps are not designed
for these fluids.
The submersible pumps must not be used for pumping of:
ƒUntreated sewage
ƒSewage containing faeces (as per EN12050-1)
ƒDrinking water
ƒFluids containing hard components (such as stones,
wood, metal, etc.)
ƒFluids containing high quantities of abrasive contents
(e.g. sand, gravel).
Intended use requires compliance with this manual. Any
other use is regarded as non-compliant with the intended
use.
4 Transport and storage
CAUTION
Soaked packaging may tear!
The product may fall on the ground if unpro-
tected and may be damaged. Lift wet pack-
aging carefully and replace it immediately!
ƒWear protective equipment!
ƒCarry the pump by the handle. Never carry or pull on the
connection cable!
ƒClean the pump and disinfect if necessary.
ƒClose the discharge connection.
ƒProtect the connection cable against kinking and dam-
age.
ƒUse original packaging for transport and storage.
ƒPack the pump when dry. Wet or humid pumps may
soften the packaging.
ƒStorage conditions:
–Maximum: -15...+60°C (5...140°F), max. humidity:
90%, non-condensing
–Recommended: 5...25°C (41...77°F), relative hu-
midity: 40…50%

en Installation and electrical connection
10 WILO SE 2021-01
5 Installation and electrical connection
5.1 Installation types
ƒStationary wet well installation
ƒPortable wet well installation
The following installation types are not permitted:
ƒDry well installation
ƒHorizontal installation
5.2 Installation
ƒWear protective equipment!
ƒDo not install a damaged or defective pump.
ƒFrost-free location.
ƒLay the connection cable properly. During operation
there must be no danger (stumbling, damage, etc.).
ƒFloat switch must be able to move freely!
5.2.1 Stationary wet well installation
min. 450x450 mm
min. 18x18 "
min. 500 mm min. 20 "
335 mm 13 "
216 mm
8,5 "
113 mm 5 "
416 mm 16 "
1
2
3
Fig.2: Installation dimensions and switching points
1 Switch-on level
2 Switch-off level
3Minimum water level for continuous duty (S1).
From here only intermittent periodic duty (S3)
For stationary wet well installation, the pump is installed
directly onto the pressure pipe. Observe and adhere to the
following points:
ƒThe connected pressure pipe must be self-supporting.
The pressure pipe must not be supported by the pump.
ƒThe pump may oscillate slightly during operation. These
oscillations must be dissipated via the pressure pipe.
ƒEnsure that the connection to the pressure pipe is
stress-free– do not screw it in too tightly.
ƒThe pressure pipe must not be smaller than the pump’s
discharge connection.
ƒSeal pipe connections with Teflon tape.
ƒInstall all specified valves in accordance with local re-
quirements (gate valve, non-return valve).
ƒLay the pressure pipe frost-proof.
ƒAvoid air intake! Air in the pump and in the pipe system
can lead to delivery problems. Air pockets must be re-
moved using the ventilation systems!
ƒInstall the pressure pipe as a “pipe loop” to avoid back-
flow from the public sewer.
At its highest point, the bottom edge of the pipe loop
must be above the locally determined backflow level!
‡Site is prepared.
‡Pressure pipe properly installed.
1. Screw the discharge pipe fully into the pump’s dis-
charge connection.
2. Position the pump at the installation site.
CAUTION!Use a hard surface or underlay at the
installation site to prevent sinking on soft sub-
strate.
3. Connect the discharge pipe to the pressure pipe
(e.g. using a flexible hose section).
4. Secure the connection cable to the pressure pipe
and route it to the socket/power supply.
▶ Pump is installed.
5.2.2 Portable wet well installation
The pump can be installed at any location on the applica-
tion site when carrying out portable wet well installation.
Observe and adhere to the following points:
ƒSecure the pump against falling over and moving
(creeping) during use.
ƒSecure the pressure hose to the hose connection.
‡Site is prepared
‡Pressure hose to be used: Min. inside diameter 1½"
‡Hose clip to be used: 40−60mm inside diameter
(1.6−2.4in)
‡Hose connection to be used: G1½" (with male
thread)
1. Attach the hose connection.
Twist the hose connection into the pressure port
as far as it will go.
2. Slide the hose clip over the pressure hose.
3. Slide the pressure hose onto the hose connection
at the pressure port.

Installation and electrical connection en
Installation and operating instructions Wilo-Rexa MINI3 11
4. Secure the pressure hose to the hose connection
using the hose clip.
5. Position the pump at the installation site.
CAUTION!Use a hard surface or underlay at the
installation site to prevent sinking on soft sub-
strate.
6. Lay the pressure hose and fasten it in the appropri-
ate place (e.g. drainage). CAUTION!If the pump is
placed in a full chamber, hold the pump at a slight
angle when immersing. This causes the air to es-
cape from the pump!
7. Route the connection cable to the socket/power
supply.
▶ Pump is installed.
5.3 Electrical connection
ƒMains connection with correctly installed protective
earth conductor.
ƒResidual-current device (RCD) is installed with 30mA.
ƒMains connection fuse protection: max. 16A.
ƒVoltage (U) and frequency (f) data on the rating plate
correspond to the data of the mains connection.
Do not connect the pump if:
ƒThe connection cable is damaged
Have the connection cable replaced by a qualified elec-
trician or the customer service.
ƒA standalone inverter is in use
Stand-alone inverters are used in autonomous power
supplies, e.g. solar power supply, and can generate over-
voltages. Overvoltages can destroy the pump.
ƒA multiple plug socket or power strip is in use
ƒAn energy-saving plug is in use
This reduces the energy supply to the pump and the
pump may heat up too much.
5.3.1 Connection: Pump with plug
Provide a socket outlet with earthing contact. To connect
the pump, insert the plug into the socket.
NOTICE
Pump starts up or is ready for operation!
Once the plug is connected to the socket, the
pump will either start immediately or be ready
for operation:
• Pump without float switch: pump
switches on immediately!
• Pump with float switch: pump is ready for
operation and will switch on depending on
the fill level!
▶ We recommend switching the socket
on and off using a separate main
switch!
5.3.2 Connection: Pump without a plug
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical
work can lead to death due to electric shock!
Electrical work must be carried out by a quali-
fied electrician in accordance with the locally
applicable regulations.
CAUTION
Irreparable damage as a result of water
penetration
Connection cables without plugs feature bare
cable ends. Water may penetrate the connec-
tion cable and pump via these bare cable ends.
This will destroy both the connection cable
and the pump. Never immerse the bare end of
the connection cable in fluid. Firmly seal it
during storage.
The pump has a connection cable with bare cable end. The
pump must be permanently connected to a switchgear.
Observe the following points:
ƒEarth the device properly!
ƒProvide a motor protection switch!
The minimum requirement is a thermal relay/motor pro-
tection switch with temperature compensation, differ-
ential trip and reactivation lock according to local regu-
lations.
ƒInstall the mains disconnection device!
Minimum requirement: Main switch with all-pole discon-
nection.

en Commissioning
12 WILO SE 2021-01
Pump with single-phase AC motor
To connect the pump firmly to the switchgear, cut off the
plug. Carry out connection to a switchgear as follows:
Wire colour Terminal in switchgear
Brown (bn) L (phase)
Blue (bl) N (neutral conductor)
Green/yellow (gn-ye) Earth (protective earth con-
ductor)
Pump with three-phase AC motor
The pump is suitable for connection to a clockwise rotat-
ing field. Check the rotating field with a rotating-field-
testing device before connection and correct if necessary.
CAUTION!The pump is not approved for operation with
a counter-clockwise rotating field! Carry out connection
to a switchgear as follows:
Wire colour Terminal in switchgear
Brown (bn) U
Black (bk) V
Blue (bl) W
Green/yellow (gn-ye) Earth (protective earth con-
ductor)
Adjust the motor protection
Set the motor protection switch to the rated current (see
rating plate).
6 Commissioning
DANGER
Risk of fatal injury due to electrical cur-
rents in accessible basins!
Do not operate the pump if there are persons
in contact with the fluid. In the event of a
fault this may cause death by electric shock!
Only activate the pump when there are no
longer any persons in contact with the fluid.
NOTICE
Check the inlet quantity!
The maximum inlet volume flow must be less
than the maximum pump delivery rate. If the
inlet quantity is higher, the pump will not be
able to pump away the volume flow. The
pump chamber may overflow!
6.1 Before activating
Check the following prior to activation:
ƒHas the electrical connection been carried out in ac-
cordance with regulations?
ƒHas the connection cable been routed safely?
ƒCan the float switch move freely?
ƒTemperature of the pumped fluid observed?
ƒImmersion depth observed?
ƒAre the pressure pipe and pump sump free of deposits?
ƒAll gate valves in the pressure pipe open?
6.2 Switching on and off
The pump is switched on and off depending on the ver-
sion:
ƒPump with plug, without float switch
The pump will switch on immediately after the plug has
been inserted into the socket. To switch off the pump,
pull the plug.
ƒPump with plug and float switch
The pump will switch on and off automatically on
reaching the switching level:
–Upper floater: Pump on.
–Lower floater: Pump off.
ƒPump with bare cable end (without plug)
Switch the pump on and off via a separate control. Read
the installation and operating instructions for the con-
trol unit for further details.
6.3 Test run
If the pump is installed stationary (e.g. cesspool, overflow
shaft), carry out a test run. Check the basic conditions
(feed quantity, switching points) with the test run. The
test run must include three pump cycles.
1. Flood the pump chamber: Open inlet.
NOTICE!The required feed quantity for the test
run can also be simulated using another water
source.
2. When the switch-on level is reached: pump starts.
3. Switch-off level reached: pump stops.
4. Repeat two more pumping processes.
▶ Once three pumping processes have been com-
pleted without problems, the test run is finished.
NOTICE!If the pump does not switch on once a week,
repeat the test run every month.

Removal en
Installation and operating instructions Wilo-Rexa MINI3 13
6.4 During operation
CAUTION
Do not allow the pump to dry run!
Do not run the pump without fluid (dry run).
Switch off the pump once the residual water
level has been reached. Dry running may des-
troy the seal and cause the pump to be irre-
parably damaged.
Check the following points:
ƒInlet quantity corresponds to the pump delivery rate.
ƒFloat switch is operating correctly.
ƒConnection cable is not damaged.
ƒPump free from deposits and encrustations.
7 Removal
DANGER
Risk of infection due to fluids hazardous
to health!
Hazardous germs can form in standing waters.
If there is a risk of germ formation, observe
the following points:
• Ensure sufficient air exchange.
• Wear a breathing protection mask e.g. 3M
Series 6000 with filter 6055 A2.
• Disinfect product.
ƒWear protective equipment!
ƒDepending on the operating mode and duration, the
housing parts become hotter than 40°C (104°F).
–Only touch the product by the carrying handle.
–Allow product to cool down.
ƒClean the device thoroughly.
7.1 Stationary wet well installation
1. Close the gate valve in the inlet and pressure pipe.
2. Switch off pump.
Pump with a plug: Pull the plug.
Pump firmly connected(without plug): Disconnect
the pump from the mains. DANGER!Have elec-
trical work carried out by a qualified electrician!
3. Disconnect the connection cable from the pressure
pipe.
4. Release the pump and discharge pipe from the
pressure pipe.
5. Lift the pump out of the operating space. CAU-
TION!Always carry the pump by the handle.
Never carry or pull the pump by the connection
cable!
6. Unscrew the discharge pipe from the pressure port.
7. Coil up the connection cable and store it with the
pump.
8. Clean pump and discharge pipe thoroughly.
If the pump remains installed after switching off, observe
the following points:
ƒProtect pump from frost and ice:
–Immerse the pump completely in the pumped fluid.
–Min. ambient temperature: +3°C (+37°F)
–Min. fluid temperature: +3°C (+37°F)
ƒIf the pump will not be used for a prolonged period,
switch on the pump and carry out one pumping process
every 2months to prevent encrustations and clogging.
CAUTION!Only carry out the pumping process under
suitable operating conditions. Allowing the pump to
dry run is strictly forbidden! Failure to observe these
instructions will lead to irreparable damage to the
pump!
If the above points are not guaranteed, remove the pump!
7.2 Portable wet well installation
1. Switching off the pump: Disconnect the plug.
2. Lift the pump out of the operating space. CAU-
TION!Always carry the pump by the handle.
Never carry or pull the pump by the connection
cable!
3. Loosen the hose clip and pull the pressure hose off
the discharge port.
4. Coil up the connection cable and store it with the
pump.
5. Clean pump and pressure hose thoroughly.
8 Cleaning
ƒWear protective equipment!
The protective equipment prevents contact with germs
that are hazardous to health and the disinfectant.
ƒIf a disinfectant is used, follow the manufacturer's in-
structions!

en Maintenance
14 WILO SE 2021-01
–Wear protective equipment according to the manu-
facturer's instructions! If in doubt, ask your specialist
dealer.
–Inform all persons about the disinfectant and how to
use it correctly!
ƒDrain the water used for cleaning into the sewage sys-
tem.
8.1 Clean pump
‡Pump removed.
‡Disinfectant is available.
1. Ensure that the plug or bare cable end is packed
and stored in a watertight manner!
2. Rinse the pump and cable with clean, running wa-
ter.
NOTICE!When using disinfectants, strictly ob-
serve the manufacturer’s specifications and in-
structions for use!
3. To clean the impeller and the pump interior, guide
the water jet inside through the pressure port.
4. Rinse attachments such as the discharge pipe and
pressure hose with clean, running water.
5. Flush any dirt residue on the floor into the sewage
drain.
6. Allow the pump to dry out.
7. Only clean the plug or bare cable end with a damp
cloth!
▶ Pump has been cleaned. Pack and store the pump.
NOTICE!If the suction port is very contaminated, re-
move the cover plate for thorough cleaning!
8.2 Cleaning the pump interior
WARNING
Sharp edges on the impeller and suction
port!
Sharp edges can form on the impeller and
suction port. There is a danger of cuts and
similar injuries! Wear protective gloves!
In the case of severe dirt and encrustations, remove the
cover plate on the suction port and clean the pump in-
terior.
1. Horizontally position the pump on a firm surface.
WARNING!Risk of hands being crushed. Make
sure that the pump cannot slip away!
2. Unscrew the 3 fastening screws on the cover
plate.
3. Remove the cover plate.
4. Rinse the pump interior with clean, running water.
Remove solids by hand.
5. Check the O-ring on the suction port. If the O-ring
is damaged (cracks, porosity, crushed areas), re-
place the O-ring.
6. Position the cover plate on the suction port.
7. Fully screw in the 3 fastening screws. NOTICE!Re-
place worn screws!
▶ Pump interior is cleaned and cover plate has been
reattached. Complete the cleaning work.
9 Maintenance
ƒWear protective equipment!
ƒOnly perform the maintenance work described in these
installation and operating instructions.
ƒCarry out maintenance work in a clean, dry and well-lit
location.
ƒUse only original parts obtained from the manufacturer.
The use of any non-original parts releases the manufac-
turer from any liability.
ƒCollect any leakage of fluid and operating fluid immedi-
ately.
ƒDispose of the operating fluid at certified collection
points.
9.1 Operating fluid
ƒCapacity: 220ml (7.4US.fl.oz)
ƒInterval for oil change: After 720 operating hours or 1x
per year
ƒOil types (ISOVGclass32):
–ELFOLNADS22
–Shell Turbo T 32

Faults, causes and remedies en
Installation and operating instructions Wilo-Rexa MINI3 15
9.2 Oil change
1
Fig.3: Sealing chamber oil change
1 Sealing chamber screw plug
‡Wear protective gloves!
‡Pump is removed, cleaned and if necessary disin-
fected.
‡Oil-resistant sealable collector tank is accessible.
1. Position the pump horizontally on a firm surface.
The screw plug should be on top. WARNING!Risk
of hands being crushed. Make sure that the pump
cannot fall over or slip!
2. Unscrew the screw plug slowly.
3. Place a collector tank underneath the pump.
4. Draining the oil: rotate the pump until the opening
points downwards.
5. Checking the oil: notify customer service if the oil
contains metal swarf!
6. Rotate the pump until the opening points upwards
again.
7. Filling the oil: pour the oil in through the opening.
⇒ Comply with requirements concerning oil type
and quantity!
8. Clean the screw plug, replace the seal ring with a
new one and fully screw it in.
9.3 General overhaul
Have the customer service team check the pump after
1,500operating hours. All components will be checked for
wear and damaged components will be replaced.
10 Faults, causes and remedies
Pump not starting or switches off after a short time
1. Interrupted power supply
⇒ Check the electrical connection of the pump.
⇒ Have a qualified electrician check fuses/resid-
ual-current devices.
2. Thermal motor monitoring has been tripped
⇒ Allow the pump to cool down. The pump will
start automatically.
⇒ Pump switches on/off too frequently. Check
the switching cycle of the float switch.
⇒ Excessive fluid temperature. Check the tem-
perature. If necessary, use a different pump.
3. Suction port/strainer/impeller silted/clogged
⇒ Shut down the pump, remove it and clean it.
4. Float switch not operational
⇒ The float switch must be able to move freely.
Pump starts up, but does not supply fluid
1. Pressure pipe/discharge pipe clogged
⇒ Flush out the pressure pipe.
⇒ Flush out the pressure hose.
⇒ Remove any kinks in the pressure hose.
2. Swing check valve contaminated
⇒ Shut down the pump, remove it and clean the
discharge connection.
⇒ Replace faulty swing check valve.
3. Water level too low
⇒ Check inlet.
⇒ Pump is pumping at a too low level. Check the
switching cycle of the float switch.
4. Suction port/strainer silted/clogged
⇒ Shut down the pump, remove it and clean it.
5. Air in the pump/pressure pipe
⇒ Position the pump at a slight angle to allow air
to escape.
⇒ Install a bleed unit in the pressure pipe.
Delivery rate drops while the pump is running
1. Pressure pipe/discharge pipe clogged
⇒ Flush out the pressure pipe.
⇒ Flush out the pressure hose.
⇒ Remove any kinks in the pressure hose.
2. Suction port/strainer silted/clogged
⇒ Shut down the pump, remove it and clean it.
3. Air in the pump/pressure pipe

en Spare parts
16 WILO SE 2021-01
⇒ Position the pump at a slight angle to allow air
to escape.
⇒ Install a bleed unit in the pressure pipe.
4. Signs of wear
⇒ Contact customer service.
Customer service
If the points listed here do not rectify the fault, contact
customer service. Costs may be incurred when using cus-
tomer service support! Please contact customer services
for more information.
11 Spare parts
Spare parts are ordered via customer service. To avoid re-
turn queries and incorrect orders, the serial or article num-
ber must always be supplied. Subject to change without
prior notice!
12 Disposal
12.1 Information on the collection of used
electrical and electronic products
Proper disposal and appropriate recycling of this product
prevents damage to the environment and putting your
personal health at risk.
NOTICE
Disposal in domestic waste is prohib-
ited!
In the European Union this symbol may be in-
cluded on the product, the packaging or the
accompanying documentation. It means that
the electrical and electronic products in ques-
tion must not be disposed of along with do-
mestic waste.
Please note the following points to ensure proper handling,
recycling and disposal of the used products in question:
ƒHand over these products at designated, certified col-
lection points only.
ƒObserve the locally applicable regulations!
Please consult your local municipality, the nearest waste
disposal site, or the dealer who sold the product to you for
information on proper disposal. See
www.wilo‑recycling.com for more information about re-
cycling.
12.2 Oil
WARNING
Risk of environmental and health dam-
age due to incorrect disposal of oils!
Oil is harmful to health and the environment!
Do not dispose of oil with domestic waste or
in the sewage system! Collect the oil in a
sealable, oil-resistant container and dispose
of it at a certified collection point.

Pioneering for You
Local contact at
www.wilo.com/contact
WILO SE
Nortkirchenstr. 100
44263 Dortmund
Germany
T [phone]
T [phone]
[email protected]
www.wilo.com