Wilo Rexa MINI3 User manual

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

en
Table of contents
1 Safety ................................................................................. 5
1.1 About these instructions ............................................5
1.2 Identification of safety instructions..........................5
1.3 Personnel qualifications..............................................7
1.4 Fluids hazardous to health..........................................7
1.5 Personal protective equipment..................................7
1.6 Transport and storage .................................................7
1.7 Installation.....................................................................8
1.8 Electrical connection ...................................................8
1.9 During operation ..........................................................8
1.10 Removal .........................................................................9
1.11 Clean and disinfect.......................................................9
1.12 Maintenance tasks .......................................................9
1.13 Commercial use ..........................................................10
1.14 Operating fluid............................................................10
2 Product description and function .................................11
2.1 Description..................................................................11
2.2 Technical data.............................................................12
2.3 Type key ......................................................................12
2.4 Scope of delivery........................................................13
2.5 Functions.....................................................................13
3 Application/use................................................................13
3.1 Intended use................................................................13
3.2 Improper use................................................................14
4 Transport and storage.....................................................15
5 Installation and electrical connection ...........................15
5.1 Installation types ........................................................15
5.2 Installation ...................................................................15
5.3 Electrical connection..................................................17
6 Commissioning.................................................................19
6.1 Before activating.........................................................20
6.2 Switching on and off ..................................................20
6.3 Test run ........................................................................20
6.4 During operation.........................................................21
7 Removal ............................................................................21
7.1 Stationary wet well installation ................................21
7.2 Portable wet well installation....................................22
8 Cleaning ............................................................................22
8.1 Clean pump..................................................................23
8.2 Cleaning the pump interior........................................23
9 Maintenance.....................................................................24
9.1 Operating fluid ............................................................24
9.2 Oil change ....................................................................24

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9.3 General overhaul ........................................................25
10 Faults, causes and remedies ..........................................25
11 Spare parts.......................................................................26
12 Disposal............................................................................26
12.1 Information on the collection of used electrical and
electronic products....................................................26
12.2 Oil .................................................................................27

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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 Ger-
man. All other languages are a translation.
Replacement of the installation and operating in-
structions
The present installation and operating instruc-
tions can be obtained again via the following
channels:
ƒDownload: http://qr.wilo.com/405
ƒContact the sales company: www.wilo.com/
contact
ƒOrder a free printed copy by e-mail: printpro-
[email protected]
Write your order in German or English. Please
state the following information when order-
ing:
–Article number (see cover)
–Language
–Delivery address
1.2 Identification of safety instructions
In these installation and operating instructions,
safety instructions are displayed as follows:

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6 WILO SE 2021-01
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

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Installation and operating instructions Wilo-Rexa MINI3 7
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 experi-
ence and knowledge if they are supervised or in-
structed 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 supervision.
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 during
transport, installation, removal and mainten-
ance:
ƒSafety shoes: Protection class S1 or P1
ƒProtective gloves (EN388): Category II, mark-
ing 3131X
Wear the following protective equipment during
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!

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8 WILO SE 2021-01
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 pro-
tective 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 dir-
ectly accessed without tools (e.g. ladders):
ƒGarden ponds
ƒPaddling pools
ƒCesspools
ƒFountains, etc.

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Installation and operating instructions Wilo-Rexa MINI3 9
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 quali-
fied 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.
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 re-
leases the manufacturer from any liability.

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10 WILO SE 2021-01
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 domestic
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 ser-
vice.
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, con-
sult a doctor.
ƒContact with eyes: Remove the contact
lenses. Rinse eye thoroughly with water. If eye
irritation occurs, consult a doctor.

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Installation and operating instructions Wilo-Rexa MINI3 11
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
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 integ-
rated 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. De-
tachable 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 integ-
rated 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. De-
tachable connection cable with float switch and fitted
shockproof plug.

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12 WILO SE 2021-01
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 mechanical
seal on the pump side. Detachable connection cable with
bare cable end, for fixed connection to on-site controls. NO-
TICE!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

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Installation and operating instructions Wilo-Rexa MINI3 13
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
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 automatically
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

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14 WILO SE 2021-01
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 out-
side 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 flu-
ids (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.

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Installation and operating instructions Wilo-Rexa MINI3 15
4 Transport and storage
CAUTION
Soaked packaging may tear!
The product may fall on the ground if unprotected and
may be damaged. Lift wet packaging 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 damage.
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 humid-
ity: 40…50%
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!

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16 WILO SE 2021-01
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 dir-
ectly onto the pressure pipe. Observe and adhere to the fol-
lowing 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 require-
ments (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 backflow
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 discharge
connection.
2. Position the pump at the installation site.
CAUTION!Use a hard surface or underlay at the in-
stallation site to prevent sinking on soft substrate.

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Installation and operating instructions Wilo-Rexa MINI3 17
3. Connect the discharge pipe to the pressure pipe (e.g. us-
ing 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 application
site when carrying out portable wet well installation. Observe
and adhere to the following points:
ƒSecure the pump against falling over and moving (creep-
ing) 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.
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 in-
stallation site to prevent sinking on soft substrate.
6. Lay the pressure hose and fasten it in the appropriate
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 escape 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 cor-
respond 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 electri-
cian or the customer service.
ƒA standalone inverter is in use

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18 WILO SE 2021-01
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 penetra-
tion
Connection cables without plugs feature bare cable ends.
Water may penetrate the connection cable and pump via
these bare cable ends. This will destroy both the connec-
tion 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. Ob-
serve the following points:
ƒEarth the device properly!

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Installation and operating instructions Wilo-Rexa MINI3 19
ƒProvide a motor protection switch!
The minimum requirement is a thermal relay/motor pro-
tection switch with temperature compensation, differen-
tial trip and reactivation lock according to local regula-
tions.
ƒInstall the mains disconnection device!
Minimum requirement: Main switch with all-pole discon-
nection.
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 rotating
field. Check the rotating field with a rotating-field-testing
device before connection and correct if necessary. CAU-
TION!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.

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20 WILO SE 2021-01
NOTICE
Check the inlet quantity!
The maximum inlet volume flow must be less
than the maximum pump delivery rate. If the in-
let 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 accord-
ance 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 version:
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 control
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.