Wilo Rexa MINI3-S User manual

Pioneering for You
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Wilo-Rexa MINI3-S
6092615 • Ed.01/2022-03
en Installation and operating instructions

Rexa MINI3-S
http://qr.wilo.com/413
Rexa MINI3
https://qr.wilo.com/405

en
Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03 3
Table of contents
1 Safety...........................................................................................4
1.1 About these instructions ..................................................... 4
1.2 Digital instructions................................................................ 4
1.3 Identification of safety instructions................................... 4
1.4 Personnel qualifications.......................................................4
1.5 Pump with macerator...........................................................5
1.6 Fluids hazardous to health................................................... 5
1.7 Personal protective equipment........................................... 5
1.8 Transport and storage.......................................................... 5
1.9 Installation ............................................................................. 5
1.10 Electrical connection............................................................ 5
1.11 During operation ................................................................... 5
1.12 Removal.................................................................................. 5
1.13 Clean and disinfect ............................................................... 6
1.14 Maintenance tasks................................................................ 6
1.15 Operating fluid ...................................................................... 6
2 Product description and function.............................................6
2.1 Description............................................................................. 6
2.2 Technical data .......................................................................7
2.3 Type key.................................................................................7
2.4 Scope of delivery................................................................... 7
2.5 Functions................................................................................ 7
3 Application/use...........................................................................7
3.1 Intended use..........................................................................7
3.2 Improper use..........................................................................7
4 Transport and storage ...............................................................7
5 Installation and electrical connection......................................8
5.1 Installation types................................................................... 8
5.2 Installation ............................................................................. 8
5.3 Electrical connection............................................................ 9
6 Commissioning .........................................................................10
6.1 Before activating.................................................................11
6.2 Switching on and off ..........................................................11
6.3 Test run ................................................................................11
6.4 During operation .................................................................11
7 Shut-down ................................................................................11
8 Removal.....................................................................................11
8.1 Stationary wet well installation ........................................11
8.2 Portable wet well installation............................................12
9 Cleaning.....................................................................................12
9.1 Clean pump..........................................................................12
10 Maintenance..............................................................................12
10.1 Operating fluid ....................................................................12
10.2 Oil change ............................................................................12
10.3 General overhaul .................................................................13
11 Faults, causes and remedies....................................................13
12 Spare parts ................................................................................13
13 Disposal .....................................................................................13
13.1 Information on the collection of used electrical and elec-
tronic products .....................................................................13
13.2 Oil ...........................................................................................13

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4 Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03
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:
•Read the instructions carefully before all
activities.
•Keep the instructions in an accessible place at
all times.
•Pass the instructions on to a subsequent
owner.
•Observe all product specifications.
•Observe the markings on the product.
The language of the original operating instruc-
tions is German. All other languages for these
instructions are translations of the original op-
erating instructions.
Failure to observe the instructions will result in
danger to persons or damage to property. The
manufacturer is not liable for damage caused
by:
•Improper use.
•Incorrect operation.
1.2 Digital instructions
The digital version of the instructions is avail-
able on the following product page:
http://qr.wilo.com/413
1.3 Identification of safety instructions
In these installation and operating instructions,
safety instructions are displayed as follows:
•Danger to persons: Safety instructions are
preceded by a corresponding symbol and are
shaded in grey.
•Damage to property: Safety instructions start
with a signal word and are displayed without
a symbol.
Signal words
•DANGER!
Failure to follow the instructions will result in
serious injuries or death!
•WARNING!
Failure to follow the instructions can lead to
(serious) injury!
•CAUTION!
Failure to follow the instructions can lead to
potentially irreparable property damage.
•NOTICE!
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
1.4 Personnel qualifications
•Persons aged 16 and over
•Have 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
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 supervision.

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Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03 5
1.5 Pump with macerator
The pump is equipped with a macerator on the
suction port. The macerator has rotating and
fixed blades. The blades are accessible from the
outside.
WARNING
Risk of injury on the macerator!
The blades are extremely sharp. There is a danger of
cuts and similar injuries!
• Never touch the macerator!
• Always carry the product by the handle!
• Always wear protective gloves (uvex phynomic
wet) when using the product!
1.6 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!
•Clean and disinfect the product thoroughly
after removal!
•Inform all persons about the pumped fluid and
the danger it poses!
1.7 Personal protective equipment
The aforementioned branded products consti-
tute non-binding suggestions. Similar products
from other brands can also be used. WILO SE
does not assume any liability for the aforemen-
tioned products.
Protective equipment: Transport, installation,
removal and maintenance
•Safety shoes: uvex 1 sport S1
•Protective gloves (EN388): uvex phynomic
wet
Protective equipment: Cleaning work
•Protective gloves (ENISO374-1): uvex pro-
fapren CF33
•Safety goggles (EN166): uvex skyguard NT
•Breathing protection mask (EN149): Half
mask 3M series 6000 with filter 6055 A2
1.8 Transport and storage
•Wear protective equipment!
•Always carry the product by the handle!
•Clean product and disinfect if necessary!
–Dirt fosters the formation of germs.
–Encrustations may lead to the impeller be-
coming blocked.
1.9 Installation
•Wear protective equipment!
•Do not install damaged or defective products.
•If there is a risk of germ formation, observe
the following points:
–Ensure sufficient air exchange.
–Wear a breathing protection mask e.g. Half
mask 3M series 6000 with filter 6055 A2
1.10 Electrical connection
•Do not connect products with a damaged
connection cable! Have the connection cable
replaced by a qualified electrician or the cus-
tomer service.
•Mains connection with correctly installed pro-
tective earth conductor.
•Install the residual-current device (RCD) with
30mA.
•Fuse protection at mains connection: max.
16A.
•Product without plug: Electrical connection
must be carried out by a qualified electrician!
1.11 During operation
•The pumping of highly inflammable and ex-
plosive fluids (petrol, paraffin, etc.) in their
pure form is strictly prohibited!
•If 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 (examples below):
•Garden ponds
•Swimming ponds
•Cesspools
NOTICE!The specifications applicable to
swimming pools also apply to accessible
basins.
1.12 Removal
•Wear protective equipment!
•Product without plug: Have the connection
cable disconnected from the mains by a qual-
ified electrician.

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6 Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03
•Depending 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.
•Clean the device thoroughly.
•If there is a risk of germ formation, observe
the following points:
–Ensure sufficient air exchange.
–Wear a breathing protection mask e.g. Half
mask 3M series 6000 with filter 6055 A2
–Disinfect product.
1.13 Clean and disinfect
•Wear protective equipment!
The protective equipment prevents contact
with germs that are hazardous to health and
the disinfectant.
•If 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!
1.14 Maintenance tasks
•Wear protective equipment!
•Carry out maintenance work in a clean, dry
and well-lit place.
•Only original parts of the manufacturer may
be used. The use of any non-original parts re-
leases the manufacturer from any liability.
•Collect any leakage of fluid and operating
fluid immediately.
1.15 Operating fluid
The oil is located in the sealing chamber. It
serves to lubricate the seal on the motor and
pump side.
•Absorb leakages immediately.
•If major leakages occur, contact customer
service.
•If the seal is defective, the oil enters the
pumped fluid and the sewer.
•Collect waste oil by type (unmixed) and dis-
pose of it in accordance with regulations at a
certified collection point.
•Skin contact: Rinse skin areas thoroughly
with soap and water. If skin irritation occurs,
consult a doctor.
•Contact with eyes: Remove the contact
lenses. Rinse eye thoroughly with water. If
eye irritation occurs, consult a doctor.
•Ingestion: Consult a doctor immediately! Do
not induce vomiting!
2 Product description and function
2.1 Description
Fully submersible grinder pump for stationary and portable wet
well installation in intermittent operation.
1
2
3
4
5
Fig.1: Overview
1 Handle
2 Motor housing
3 Discharge connection
4 Pump housing with pump support foot
5 Connection cable
Rexa MINI3-S.../M.../P
Sewage pump with radial macerator with double shear effect. Hori-
zontal discharge port with flange and oval connection. Hydraulics
housing and impeller made of grey cast iron; macerator made of
hardened cutting steel. Surface-cooled 1~ motor with self-
switching thermal motor monitoring. Oil-filled sealing chamber
with two mechanical seals. Stainless steel motor housing. Detach-
able connection cable with capacitor box and plug (CEE 7/7).
Rexa MINI3-S.../M.../A
Sewage pump with radial macerator with double shear effect. Hori-
zontal discharge port with flange and oval connection. Hydraulics
housing and impeller made of grey cast iron; macerator made of
hardened cutting steel. Surface-cooled 1~ motor with self-
switching thermal motor monitoring. Oil-filled sealing chamber

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Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03 7
with two mechanical seals. Stainless steel motor housing. Detach-
able connection cable with capacitor box, float switch and plug
(CEE 7/7).
Rexa MINI3-S.../T.../O
Sewage pump with radial macerator with double shear effect. Hori-
zontal discharge port with flange and oval connection. Hydraulics
housing and impeller made of grey cast iron; macerator made of
hardened cutting steel. Surface-cooled 3~ motor with thermal
motor monitoring. Oil-filled sealing chamber with two mechanical
seals. Stainless steel motor housing. Detachable connection cable
with bare cable ends.
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 DN32/40
Operating mode, immersed S1
Operating mode, non-im-
mersed
S3 10%2)
Fluid temperature 3...+40°C (37...104°F)
Fluid temperature, short-term
for 3min
-
Max. immersion depth 7m (23ft)
Protection class IP68
Insulation class F
Max. switching frequency /h 60/h
Key
1) In accordance with ISO8601
2) 1min operation, 9min standby
2.3 Type key
Ex-
ample:
Rexa MINI3-S03/M008-523/A
Rexa Submersible sewage pump
MINI3 Series
S Macerator
03 Nominal diameter of the discharge connection:
DN32/40
M Mains connection version:
•M = single-phase current (1~)
•T = three-phase current (3~)
008 Value/10 = rated power P2 in kW
- Not Ex-rated
5 Mains frequency: 5 = 50Hz/6 = 60Hz
23 Rated voltage code
A Additional electrical equipment:
•O = with bare cable end
•P = with plug (CEE7/7)
•A = with float switch and plug (CEE7/7)
2.4 Scope of delivery
•Pump
•Installation 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-S...-A is equipped with a float switch. The float
switch is used to switch the pump on and off depending on the
level:
•Upper floater: Pump on
•Lower floater: Pump off
3 Application/use
3.1 Intended use
For the pumping in domestic areas of:
•Sewage containing faeces
•Wastewater (with small amounts of sand)
Sewage pumping according to (DIN)EN12050
The pumps meet the requirements of EN12050-1.
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 pro-
hibited. There is a risk of fatal injury due to explo-
sion! The pumps are not designed for these fluids.
The submersible pumps must not be used for pumping:
•Untreated sewage
•Drinking water
•Fluids containing hard components (such as stones, wood,
metal, etc.)
•Fluids containing high quantities of abrasive contents (e.g.
sand, gravel).
•Viscous fluids (e.g. oil and grease)
•Seawater
Intended use also includes compliance with this manual. Any other
use is regarded as non-compliant with intended use.
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!
•Wear protective equipment!

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8 Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03
•Carry the pump by the handle. Never carry or pull on the con-
nection cable!
•Clean the pump and disinfect if necessary.
•Close the discharge connection.
•Protect the connection cable against kinking and damage.
•Use original packaging for transport and storage.
•Pack the pump when dry. Wet or humid pumps may soften the
packaging.
•Storage conditions:
–Maximum: -15...+60°C (5...140°F), max. humidity: 90%,
non-condensing
–Recommended: 5...25°C (41...77°F), relative humidity:
40…50%
5 Installation and electrical connection
5.1 Installation types
•Vertical stationary wet well installation
•Vertical portable wet well installation
5.2 Installation
•Wear protective equipment!
•Do not install a damaged or defective pump.
•Frost-free location.
•Lay the connection cable properly. During operation there must
be no danger (stumbling, damage, etc.).
•Float switch must be able to move freely!
5.2.1 Stationary wet well installation
A suspension unit must be installed for the stationary wet well in-
stallation. The on-site discharge pipe is connected to the suspen-
sion unit. The pump is connected to the suspension unit via a
coupling connection. Observe and adhere to the following points:
•The connected discharge pipe must be self-supporting. The
dischargee pipe must not be supported by the suspension unit.
•The discharge pipe must not be smaller than the pump’s dis-
charge connection.
•Install all specified valves in accordance with local requirements
(gate valve, non-return valve).
•Lay the discharge pipe frost-proof.
•Air pockets in the pump and in the discharge pipe can lead to
delivery problems.
Installing the ventilation systems:
–E.g. Air vent valve
–In the discharge pipe
–Before the non-return valve
•Install the discharge pipe as a “pipe loop” to avoid backflow
from the main public sewer.
At its highest point, the bottom edge of the pipe loop must be
above the locally determined backflow level!
485 mm
19 in
265 mm
10.5 in
min. 405 mm
min. 16 in
390 mm
15 in
460 mm
18 in
160 mm
6 in
195 mm
8 in
min. 100 mm
min. 4 in
OFF!
S1
S3
DN 40/50, PN 10
ANSI B16.1, Size 2, Class 125
1
2
3
45
Fig.2: Overview of components and installation dimensions
1 Upper holder for the guide pipe
2 Guide pipe 26.9x2mm (1.06x0.08in)
3 Foot elbow
4 Coupling connection
5 Pump
Fill level above: Continuous duty (operating mode im-
mersed)
Fill level below: Intermittent periodic duty (operating mode
non-immersed)
OFF Switch-off level
The following accessories are required for installation:
•Suspension unit DN40/50 (article number: 2057179)
Consisting of foot elbow, coupling connection and upper
holder.
•Two guide pipes 26.9x2mm (1.06x0.08in), length: 6m (19.7ft)
(article number: 6049244)
•Stainless steel lifting chain, length: 6m (19.7ft) (article number:
6084893)
•Installation sundries DN40/50/65 (article number: 6076963)
✓Suspension unit installed.
✓Pressure pipe properly installed.
✓Lifting chain installed on the carrying handle.
1. Attach the coupling connection to the discharge connection
of the pump.
2. Lift the pump. Thread the coupling connection onto the guide
pipes.
3. Drain the pump at the guide pipes up to the foot elbow.
4. Attach the lifting chain to the pump chamber opening.

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Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03 9
5. Route the connection cable to the socket/power connection
according to local regulations.
▶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 ad-
here to the following points:
•Secure the pump against falling over and moving (creeping)
during use.
•Secure the pressure hose to the hose connection.
100 mm
4 in
240 mm
9.5 in
195 mm
8 in
335 mm
13 in
407 mm
16 in
OFF!
S1
S3
Fig.3: Installation dimensions
Fill level above: Continuous duty (operating mode im-
mersed)
Fill level below: Intermittent periodic duty (operating mode
non-immersed)
OFF Switch-off level
The following accessories are required for installation:
•Hose connection with 90° pipe elbow (article number: 2057179)
Consisting of threaded flange, 90° pipe elbow and installation
accessories
•5m (16.4ft) pressure hose, inside diameter: 42mm (1.65in),
including hose clip (article number: 2027642)
✓Site is prepared
✓Hose connection assembled
1. Install the hose connection on the pressure port.
2. Slide the hose clip over the pressure hose.
3. Slide the pressure hose onto the hose connection.
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 substrate.
6. Lay the pressure hose and fasten it in the appropriate place
(e.g. drain). 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
•Mains connection with correctly installed protective earth con-
ductor.
•Residual-current device (RCD) is installed with 30mA.
•Mains connection fuse protection: max. 16A.
•Voltage (U) and frequency (f) data on the rating plate corres-
pond to the data of the mains connection.
Do not connect the pump if:
•The connection cable is damaged
Have the connection cable replaced by a qualified electrician or
the customer service.
•A standalone inverter is in use
Stand-alone inverters are used in autonomous power supplies,
e.g. solar power supply, and can generate overvoltages. Over-
voltages can destroy the pump.
•A multiple plug socket or power strip is in use
•An energy-saving plug is in use
This reduces the energy supply to the pump and the pump may
heat up too much.
•Operation on start-up controls
The pump is not suitable for operation on a frequency converter
or a soft start control.
•Explosive atmospheres
Do not connect and operate the pump inside potentially ex-
plosive atmospheres!
5.3.1 Connection: Pump with plug
The pump is equipped with a plug (CEE7/7). The connection to the
mains is established by inserting the plug into the socket (type E or
type F). The plug is not watertight. NOTICE!The thermal motor
monitoring is self-switching. A separate connection is not ne-
cessary.
Connection to an existing switchgear
DANGER
Risk of fatal injury due to electrical current!
Improper conduct when carrying out electrical work
can lead to death due to electric shock!
• Electrical work must be carried out by a qualified
electrician!
• Observe local regulations!
To connect the pump to a switchgear, cut off the plug. Connect
the connection cable according to the connection diagram in the
switchgear.

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10 Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03
bn
bu
Cr
Cs
M 1~
gn-ye
U1/Z1
bn
U2
bk
Z2
gy
gn-ye
LNPE
Fig.4: Connection diagram 1~ motor
Wire colour Terminal
Brown (bn) L
Blue (bu) N
Green/yellow (gn-ye) Earth
5.3.2 Connection: Pump without a plug
DANGER
Risk of fatal injury due to electrical current!
Improper conduct when carrying out electrical work
can lead to death due to electric shock!
• Electrical work must be carried out by a qualified
electrician!
• Observe local regulations!
CAUTION
Irreparable damage as a result of water pen-
etration
Connection cables without plugs feature bare cable
ends. Water may penetrate the connection cable
and pump via these bare cable ends. This will des-
troy 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. Connect the
pump firmly to a switchgear. Observe the following points:
•Connection in the switchgear according to the connection dia-
gram.
•Mains connection with clockwise rotating field
•Earth the device properly!
•Provide a motor protection switch!
The minimum requirement is a thermal relay/motor protection
switch with temperature compensation, differential trip and re-
activation lock according to local regulations.
Set the motor protection switch to the rated current (see rating
plate).
•Install the mains disconnection device!
Minimum requirement: Main switch with all-pole disconnection.
•Thermal motor monitoring:
–Sensor: Bimetallic strip
–Number of temperature circuits: 1, temperature limiter
–Connection values: max. 250V(AC), 2.5A, cosphi=1
–Threshold value: is set by the sensor.
–Triggering status: When the threshold value is reached,
switch off the pump!
W
5
1 2
V
4
U
3
M 3~
gn-ye
L3L2 2120L1PE
250 V (AC); 2,5 A
cos φ = 1
Fig.5: Connection diagram 3~ motor
Wire number Name Terminal
1 20 WSK
2 21 WSK
3 U L1
4 V L2
5 W L3
Green/yellow (gn-ye) Earth PE
6 Commissioning
DANGER
Risk of fatal injury due to electrical currents
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 con-
tact 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 quant-
ity is higher, the pump will not be able to pump
away the volume flow. The pump chamber may
overflow!