Wilo Rexa MINI3-V-A Series User manual

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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

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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.