Wilo HC 20.1 E3 Series User manual

Pioneering for You
Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa
SOLID
6086018 • Ed.02/2019-01
en-US Installation and operating instructions es Instrucciones de instalación y funcionamiento

3
US-English................................................................................................................ 4
Español ..................................................................................................................... 54
WILO186739

en-US
4 WILO SE 2019-01
Table of contents
1 General.............................................................................................................................................................................................. 6
1.1 About this manual......................................................................................................................................................................................................6
1.2 Note on conformity ...................................................................................................................................................................................................6
1.3 Copyright ....................................................................................................................................................................................................................6
1.4 Subject to changes ....................................................................................................................................................................................................6
1.5 Warranty......................................................................................................................................................................................................................6
2 Safety................................................................................................................................................................................................ 6
2.1 Identification of safety instructions........................................................................................................................................................................7
2.2 Personnel qualifications............................................................................................................................................................................................8
2.3 Electrical work ............................................................................................................................................................................................................8
2.4 Monitoring devices ....................................................................................................................................................................................................9
2.5 Operating in fluids that are hazardous to health...................................................................................................................................................9
2.6 Transport.....................................................................................................................................................................................................................9
2.7 Installation/dismantling work ..................................................................................................................................................................................9
2.8 During operation ..................................................................................................................................................................................................... 10
2.9 Maintenance work .................................................................................................................................................................................................. 10
2.10 Operating fluids....................................................................................................................................................................................................... 11
2.11 Operator’s obligations............................................................................................................................................................................................ 11
3 Application/Use.............................................................................................................................................................................. 11
3.1 Intended use............................................................................................................................................................................................................ 11
3.2 Improper use............................................................................................................................................................................................................ 11
4 Product description....................................................................................................................................................................... 11
4.1 Construction............................................................................................................................................................................................................ 11
4.2 Monitoring devices ................................................................................................................................................................................................. 13
4.3 Operating modes..................................................................................................................................................................................................... 14
4.4 Operation with frequency converter.................................................................................................................................................................... 14
4.5 Operation in an explosive atmosphere ................................................................................................................................................................ 14
4.6 Rating plate.............................................................................................................................................................................................................. 15
4.7 Type key................................................................................................................................................................................................................... 15
4.8 Scope of delivery..................................................................................................................................................................................................... 16
4.9 Accessories .............................................................................................................................................................................................................. 16
5 Transport and storage................................................................................................................................................................... 17
5.1 Delivery..................................................................................................................................................................................................................... 17
5.2 Transport.................................................................................................................................................................................................................. 17
5.3 Storage ..................................................................................................................................................................................................................... 18
6 Installation and electrical connection ......................................................................................................................................... 19
6.1 Personnel qualifications......................................................................................................................................................................................... 19
6.2 Installation methods............................................................................................................................................................................................... 19
6.3 Operator’s obligations............................................................................................................................................................................................ 19
6.4 Installation ............................................................................................................................................................................................................... 19
6.5 Electrical connection.............................................................................................................................................................................................. 25
7 Commissioning............................................................................................................................................................................... 29
7.1 Personnel qualifications......................................................................................................................................................................................... 29
7.2 Operator’s obligations............................................................................................................................................................................................ 29
7.3 Direction of rotation check (three-phase motors only).................................................................................................................................... 29
7.4 Operation in an explosive atmosphere ................................................................................................................................................................ 30
7.5 Before switching on................................................................................................................................................................................................ 30
7.6 Switching on and off .............................................................................................................................................................................................. 31
7.7 During operation ..................................................................................................................................................................................................... 31

en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 5
8 Decommissioning/removal ........................................................................................................................................................... 32
8.1 Personnel qualifications......................................................................................................................................................................................... 32
8.2 Operator’s obligations............................................................................................................................................................................................ 32
8.3 Decommissioning.................................................................................................................................................................................................... 33
8.4 Removal.................................................................................................................................................................................................................... 33
9 Maintenance and repair................................................................................................................................................................. 35
9.1 Personnel qualifications......................................................................................................................................................................................... 36
9.2 Operator’s obligations............................................................................................................................................................................................ 36
9.3 Operating fluids....................................................................................................................................................................................................... 36
9.4 Maintenance intervals............................................................................................................................................................................................ 37
9.5 Maintenance measures .......................................................................................................................................................................................... 37
9.6 Repairs ...................................................................................................................................................................................................................... 41
10 Faults, causes and remedies ......................................................................................................................................................... 44
11 Spare parts...................................................................................................................................................................................... 48
12 Disposal........................................................................................................................................................................................... 48
12.1 Oils and lubricants................................................................................................................................................................................................... 48
12.2 Water-glycol mixture............................................................................................................................................................................................. 48
12.3 Protective clothing ................................................................................................................................................................................................. 48
12.4 Information on the collection of used electrical and electronic products...................................................................................................... 48
13 Appendix......................................................................................................................................................................................... 48
13.1 Tightening torques ................................................................................................................................................................................................. 48
13.2 Operation with frequency converter.................................................................................................................................................................... 49
13.3 Ex rating ................................................................................................................................................................................................................... 50

en-US General
6 WILO SE 2019-01
1 General
1.1 About this manual The 'Installation and operating instructions' are an integral part of the product. Read these
instructions before all activities and keep them accessible at all times. Strict observance of
these instructions is a prerequisite for the intended use and correct handling of the product.
Observe all information and markings on the product.
The language of the original operating instructions is German. All other languages of these
instructions are translations of the original operating instructions.
1.2 Note on conformity This product was developed and manufactured in accordance with the applicable EU prod-
uct directives, to which all products sold in the EU must conform.
This product therefore complies with the relevant, general safety and health requirements
of the European Union, as well as the published European standards and internationally rec-
ognized German standards.
Since this product was not intended to be sold and used in the European Union, it does not
have a CE marking. It is therefore not permitted to sell it in the European Union.
1.3 Copyright These 'Installation and operating instructions' have been copyrighted by the manufacturer.
The content, of any kind, may not be reproduced, distributed or used for any competitive
purpose without authorization and handed to third parties.
1.4 Subject to changes The manufacturer reserves the right to make technical modifications to the product or indi-
vidual components. Illustrations used may differ from the original and serve only as example
illustrations of the product.
1.5 Warranty For the warranty and warranty period the specifications according to the current “General
Terms and Conditions” apply. You can find these here: www.wilo.com/legal
Any deviations must be contractually agreed and shall then be given priority.
Warranty
If the following points have been adhered to, the manufacturer is obliged to repair any qual-
itative or constructive defects:
▪The defects were reported in writing to the manufacturer within the warranty period.
▪Application according to intended use.
▪All monitoring devices are connected and were checked before commissioning.
Disclaimer
A disclaimer rules out any responsibility for personal injury, material damage or financial
losses. This exclusion of liability follows as soon as one of the following points applies:
▪Inadequate configuration due to unsatisfactory or false information from the operator or
employer
▪Non-compliance with the 'Installation and operating instructions'
▪Improper use
▪Improper storage or transport
▪Faulty installation or dismantling
▪Insufficient or incorrect maintenance
▪Unauthorized repairs
▪Unsatisfactory building site
▪Chemical, electrical or electrochemical influences
▪Wear
2 Safety This section contains basic information for the individual phases of the life cycle. Failure to
observe this information will result in the following risks:
▪Danger to persons due to electrical, mechanical and bacteriological effects as well as elec-
tromagnetic fields
▪Danger to the environment due to leakage of hazardous substances
▪Material damage

Safety en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 7
▪Failure of important functions of the product
Failure to observe the information contained herein will result in the loss of claims for dam-
ages.
In addition, observe the instructions and safety instructions in the following sections!
2.1 Identification of safety instruc-
tions In these 'Installation and operating instructions', safety instructions are used for material
damage and personal injury. These safety instructions are illustrated differently:
▪Safety instructions for personal injury start with a signal word, have a corresponding pre-
fixed symbol and are grayed out.
DANGER
Type and source of the danger!
Impacts of the danger and instructions for prevention.
▪Safety instructions for material damage start with a signal word and are illustrated without a
symbol.
CAUTION
Type and source of the danger!
Impacts or information.
Signal words
▪DANGER!
Violation causes death or serious injury!
▪WARNING!
Violation can cause (serious) injury!
▪CAUTION!
Violation can cause material damage, total breakdown is possible.
▪NOTICE!
Useful indication for handling the product
Text designations
‡Prerequisite
1. Work step/list
⇒ Notice/instruction
▶ Result
Symbols
The following symbols are used in these instructions:
Danger of electrical voltage
Danger from bacterial infection
Danger of explosion
Danger – explosive atmosphere

en-US Safety
8 WILO SE 2019-01
General warning symbol
Warning of cutting injuries
Warning of hot surfaces
Warning of high pressure
Warning of suspended load
Personal protective equipment: wear a protective helmet
Personal protective equipment: wear foot protection
Personal protective equipment: wear hand protection
Personal protective equipment: wear mouth protection
Personal protective equipment: wear safety goggles
Working alone forbidden! A second person must be present.
Useful indication
2.2 Personnel qualifications The personnel must:
▪Be informed of the locally applicable accident prevention regulations.
▪Have read and understood the 'Installation and operating instructions'.
The personnel must have the following qualifications:
▪Electrical work: A qualified electrician must carry out the electrical work.
▪Installation-/dismantling work: The technician must be trained to handle the necessary tools
and required fastening materials for the present building site.
▪Maintenance work: The technician must be familiar with the use of operating fluids and their
disposal. Furthermore, the technician must have basic knowledge of engineering.
Definition “Qualified Electrician”
A qualified electrician is someone with suitable technical training, knowledge and experi-
ence, who can recognize and avoid the dangers associated with electricity.
2.3 Electrical work ▪Have electrical work carried out by a qualified electrician.
▪Before commencing work, disconnect the product from the power supply and safeguard it
from being switched on again.

Safety en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 9
▪Observe applicable local provisions when making the power connection.
▪Adhere to the provisions of the local energy supply company.
▪Train personnel in the execution of the electrical connection.
▪Instruct personnel in the options for switching off the device.
▪Adhere to the technical information in these installation and operating instructions as well
as on the rating plate.
▪Earth product.
▪Observe provisions for connection to the electrical switching systems.
▪Comply with the specifications on electro-magnetic compatibility when using electronic
start-up controllers (e.g. soft starter or frequency converter). If required, take special mea-
sures into account (e.g. shielded cables, filters etc.).
▪Replace defective connection cables. Contact customer service.
2.4 Monitoring devices The following monitoring devices must be provided by the customer:
Circuit breaker
The size and switching characteristics of the circuit breakers must conform to the rated cur-
rent of the product connected. Observe the locally applicable regulations.
Motor protection switch
For products supplied without a plug, a motor protection switch must be installed on-site.
The minimum requirement is a thermal relay/motor protection switch with temperature
compensation, differential triggering and an anti-reactivation device, in accordance with lo-
cal regulations. Further protection devices (e.g. overvoltage, undervoltage, or phase-failure
relay etc.) must be provided on-site for sensitive power supplies.
Residual-current device (RCD)
Adhere to the regulations of the local energy supply company! We recommend using a
residual-current device (RCD).
If persons come into contact with the product and conductive liquids, secure connection
with a residual-current device (RCD).
2.5 Operating in fluids that are haz-
ardous to health When using the product in fluids which are dangerous to health, there is a danger of bacte-
rial infection! Thoroughly clean and disinfect the product after removal and before further
use. The operator must ensure the following points:
▪When cleaning the product the following protective equipment is made available and worn:
– Closed safety goggles
– Breathing mask
– Protective gloves
▪All persons are informed about the fluid, the danger resulting from it and how to handle it!
2.6 Transport ▪The following protective equipment must be worn:
– Safety shoes
– Protective helmet (when using lifting equipment)
▪Always use the product by the handle when transporting. Never pull on the power supply
cable!
▪Only use legally specified and permitted lifting gear.
▪Select lifting gear according to the present conditions (weather, attachment point, load
etc.).
▪Always attach lifting gear to the attachment points (handle or lifting eye).
▪The standard safety of the lifting equipment must be guaranteed during application.
▪When using lifting equipment, get a second person to coordinate the procedure if necessary
(e.g. view blocked).
▪Standing under suspended loads is not permitted. Do not move suspended loads over work-
ing areas occupied by people.
2.7 Installation/dismantling work ▪Wear the following protective equipment:
– Safety shoes
– Safety gloves that protect against cuts
– Protective helmet (when using lifting equipment)
▪At the operation site adhere to applicable laws and regulations for work safety and accident
prevention.

en-US Safety
10 WILO SE 2019-01
▪Disconnect the product from the power supply and secure against unauthorized switch-on.
▪All rotating parts must stop.
▪Ensure sufficient aeration in closed rooms.
▪When working in chambers and closed rooms a second person must be present for safety
reasons.
▪If toxic or suffocating gases build up, immediately initiate countermeasures!
▪Clean product thoroughly. Disinfect products which have been used in fluids which are dan-
gerous to health!
▪Ensure that there is no danger of explosion during all welding work or work with electrical
devices.
2.8 During operation ▪Wear the following protective equipment:
– Safety shoes
– Hearing protection (according to the work regulations notice)
▪Keep people out of the product's working area. There must be no persons in the working
area during operation.
▪The operator must inform his/her superior immediately of any faults or irregularities.
▪If defects which are dangerous to health arise, an immediate deactivation by the operator
must be performed:
– Breakdown of the safety and monitoring devices
– Damage to the housing components
– Damage to electrical equipment
▪Never reach into the suction ports. The rotating parts can crush and sever limbs.
▪If the motor emerges during operation, as well as in dry well installation, the motor housing
can heat up to above 40°C (104°F).
▪Open all gate valves on the suction and pressure side of the pipe.
▪Ensure minimum water submersion with dry-running protection.
▪Under normal operating conditions the product has a sound pressure of below 85dB(A).
However, the actual sound pressure level depends on several factors:
– Installation depth
– Installation
– Fixation of accessories and piping
– Duty point
– Immersion depth
▪If the product is running under the applicable operating conditions, the operator must carry
out a sound pressure measurement. Hearing protection must be worn if the sound pressure
is above 85dB(A) and an indication made in the work regulations!
2.9 Maintenance work ▪Wear the following protective equipment:
– Closed safety goggles
– Safety shoes
– Safety gloves that protect against cuts
▪Always carry out maintenance work outside the operating space/installation site.
▪Only perform maintenance work which is described in these 'Installation and operating in-
structions'.
▪Only original parts from the manufacturer may be used for maintenance and repair. The use
of parts other than original parts absolves the manufacturer of any liability.
▪Immediately clean up leakage from the fluid and operating fluid and dispose of according to
the locally applicable guidelines.
▪Store tools in the places provided.
▪Upon completion of the work re-install all safety and monitoring devices and check for cor-
rect functioning.
Change of operating fluid
In the event of a defect, a pressure of several bar can build up inside the motor! This pres-
sure escapes when opening the screw plugs. Screw plugs opened carelessly can be ejected
at high speed! To avoid injuries, observe the following instructions:
▪Adhere to the prescribed sequence of work steps.
▪Unscrew screw plugs slowly but never fully. As soon as the pressure escapes (an audible
whistling or hissing of air), do not turn any further.
WARNING!When the pressure escapes, hot operating fluid can also be ejected.This can
lead to burns!To avoid injury, allow the motor to cool down to ambient temperature be-
fore commencing work!

Application/Use en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 11
▪When the pressure has fully dissipated, fully unscrew screw plug.
2.10 Operating fluids The motor is filled with white oil or a water-glycol mixture in the sealing chamber and cool-
ing system. The operating fluids must be replaced during the regular maintenance work and
disposed of according to the local guidelines.
2.11 Operator’s obligations ▪Provide the 'Installation and operating instructions' in the language of the personnel.
▪Ensure the required training of personnel for the specified work.
▪Provide the required protective equipment and ensure that the personnel wear the protec-
tive equipment.
▪Ensure that the attached safety and information signs on the product are always legible.
▪Instruct the personnel in the operating principle of the system.
▪Exclude any potential risks presented by electricity.
▪Fit dangerous components within the system with an on-site guard.
▪Secure and mark the work area.
▪For a safe workflow define the personnel’s work plan.
Children and persons under 16 years of age or with limited physical, sensory or cognitive ca-
pacities are prohibited from handling the product! Persons under 18 years of age must be
supervised by a technician!
3 Application/Use
3.1 Intended use The submersible pumps are suited for pumping:
▪Sewage with faeces
▪Wastewater (with small amounts of sand and grit)
▪Process sewage
▪Pumped fluids with up to max. 8% dry matter
3.2 Improper use
DANGER
Explosion due to pumping explosive fluids!
Pumping highly flammable and explosive fluids (benzene, kerosene etc.) in their pure
form is strictly forbidden. There is a risk of fatal injury due to explosion! The pumps are
not designed for these fluids.
DANGER
Danger due to fluids which are hazardous to health!
When the pump is used in fluids which are hazardous to health, decontaminate the pump
after removal and before all work! There is a risk of fatal injury! Observe information from
the work regulations! The operator must ensure that the personnel have received and
read the work regulations!
The submersible pumps must not be used for pumping:
▪Potable water
▪Fluids containing hard components (e.g. stone, wood, metal etc.)
▪Fluids with large amounts of abrasive contents (e.g. sand, grit)
Intended use also includes compliance with these instructions. Any other use is regarded as
improper use.
4 Product description
4.1 Construction Submersible sewage pump as submersible monobloc unit for continuous duty in wet well
and dry well installation.

en-US Product description
12 WILO SE 2019-01
1
2
3
4
5
6
Fig.1: Overview
1 Handle
2 Motor
3 Connection cable
4 Pressure port
5 Hydraulics housing
6 Bearing housing
4.1.1 Hydraulics Centrifugal hydraulics with different impeller shapes, horizontal flange connection on the
pressure side, inspection cover as well as neck and impeller wear rings.
The hydraulics are not self-priming, in other words, the fluid must flow in either automati-
cally or with supply pressure.
Impeller shapes
The individual impeller shapes depend on the size of the hydraulics and not every impeller
shape is available for every hydraulic system. The following is an overview of the different
impeller shapes:
▪Vortex impeller
▪Single-channel impeller
▪Two-channel impeller
▪Three-channel impeller
▪Four-channel impeller
▪SOLID impeller, closed or semi-open
Inspection cover (depending on the hydraulics)
Additional opening on the hydraulics housing. This opening is used to remove clogging in
the hydraulics.
Neck and impeller wear rings (depending on the hydraulics)
The suction port and impeller are subjected to the most stress when pumping. In the case of
channel impellers, the gap between the impeller and the suction port is an important factor
for a constant efficiency. The larger the gap between the impeller and the suction port, the
higher the losses in the delivery rate. The efficiency decreases and the danger of clogging
increases. In order to ensure long and efficient operation of the hydraulics, an impeller wear
ring and/or neck ring is installed depending on the impeller and the hydraulics.
▪Impeller wear ring
The impeller wear ring is attached to the channel impellers and protects the incoming flow
edge of the impeller.
▪Neck ring
The neck ring is installed in the suction port of the hydraulics and protects the incoming
flow edge in the centrifugal chamber.
The two components can be replaced easily when worn.
4.1.2 Motor In the three-phase current version, self-cooling submersible motors are used as the drive.
The motor can be used in continuous duty both immersed and non-immersed. Continuous
duty is also possible in dry well installation. The roller bearings are permanently lubricated,

Product description en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 13
which means they are maintenance-free. The connection cable is longitudinally watertight
and has bare cable ends.
4.1.3 Cooling system The motor has an active cooling system with separate cooling circuit. The water-glycol mix-
ture P35 is used as coolant. Coolant circulation is performed by an impeller. The impeller is
driven with a magnetic coupling by the motor shaft. The waste heat is transferred directly to
the fluid via the cooling flange. The cooling system is not pressurized when in cold state. A
built-in overpressure valve limits the max. pressure to 3bar in the event of a fault.
CAUTION!The overpressure valve is only fitted as standard from year of manufacture
2015 onwards. In the case of motors without an overpressure valve extremely high pres-
sure can occur in the cooling system if there is a fault. It is imperative that a conversion
is made! Please contact customer service for the conversion!
4.1.4 Seal Different methods are used for the seal to the fluid and the motor compartment:
▪Version "G": two separate mechanical seals
▪Version "K": two mechanical seals in a block seal cartridge made of stainless steel
Leakage from the seal is caught in the sealing chamber or leakage chamber:
▪The sealing chamber accommodates any possible leakage of the seal on the fluid side.
▪The leakage chamber accommodates any possible leakage of the seal on the motor side.
The sealing chamber between the mechanical seals is filled with medical white oil. The leak-
age chamber is empty.
4.1.5 Material The following materials are used in the standard version:
▪Pump housing: EN-GJL-250 (ASTMA48 Class35/40B)
▪Impeller: EN-GJL-250 (ASTMA48 Class35/40B)
▪Motor housing: EN-GJL-250 (ASTMA48 Class35/40B)
▪Seal:
– Motor side:
• Version "G": Carbon/ceramic
• Version "K": SiC/SiC
– Fluid side: SiC/SiC
– Static: NBR (nitrile)
The precise details of the materials are shown in the respective configuration.
4.2 Monitoring devices Overview of possible monitoring devices:
HC 20.1 HC 20.1 ...-E3
Internal monitoring devices
Terminal room/motor compartment • •
Motor winding • •
Motor bearings o o
Sealing chamber − −
Leakage chamber • •
Vibration sensor − −
External monitoring devices
Sealing chamber o o
Key: − = not available/possible, o = optional, • = as standard
All monitoring devices fitted must be connected at all times!
Monitoring the terminal room and motor compartment
The terminal room and motor compartment monitoring protects the motor terminals and
winding from short-circuits. An electrode in both the terminal room and the motor com-
partment measures the moisture content.

en-US Product description
14 WILO SE 2019-01
Monitoring of motor winding
The thermal motor monitoring protects the motor winding from overheating. Temperature
limiter with PTC sensor is fitted.
External monitoring of the sealing chamber
The sealing chamber can be equipped with an external pencil electrode. The electrode regis-
ters fluid ingress through the mechanical seal on the fluid side. An alarm or deactivation of
the pump can therefore take place through the pump control.
Leakage chamber monitoring
The leakage chamber is equipped with a float switch. The float switch registers fluid ingress
through the mechanical seal on the motor side. An alarm or deactivation of the pump can
therefore take place through the pump control.
Monitoring of motor bearing
The thermal monitoring of the motor bearing protects the roller bearings against overheat-
ing. Pt100 sensors are used for temperature measurement.
4.3 Operating modes
Operating mode S1: Continuous duty
The pump can operate continuously at the rated load without exceeding the permissible
temperature.
Operating mode: Non-immersed operation
The "non-immersed operation" operating mode describes the possibility of the motor
emerging during the drainage pumping sequence. This allows a further lowering of the water
level as far as the upper edge of the hydraulics. Observe the following points during non-
immersed operation:
▪Operating mode: Continuous duty (S1).
▪Max. fluid and ambient temperature: The max. ambient temperature corresponds to the
max. fluid temperature shown on the rating plate.
4.4 Operation with frequency con-
verter Operation on the frequency converter is permitted. Refer to the appendix for the relevant
requirements!
4.5 Operation in an explosive atmos-
phere HC 20.1 HC 20.1 ...-E3
ATEX approval o o
FM approval o −
CSA-Ex approval − −
Key: − = not available/possible, o = optional, • = as standard
For use in explosive atmospheres, the pump must be marked as follows on the rating plate:
▪“Ex” symbol for the relevant approval
▪Ex classification
For the relevant requirements, refer to the explosion protection chapter in the appendix
of these installation and operating instructions!
ATEX approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪Device group: II
▪Category: 2, zone 1 and zone 2
These pumps must not be used in zone 0!
FM approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪Protection class: Explosionproof
▪Category: Class I, Division 1

Product description en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 15
Notice: If the cabling is carried out according to Division 1, installation in Class I, Division 2 is
also permitted.
4.6 Rating plate The following is an overview of the abbreviations and associated data on the rating plate:
Rating plate
designation
Value
P-Typ Pump type
M-Typ Motor type
S/N Serial number
Art.-No. Article number
MFY Date of manufacture*
QNVolume flow duty point
Qmax Max. volume flow
HNDelivery head duty point
Hmax Max. delivery head
Hmin Min. delivery head
nSpeed
TMax. fluid temperature
IP Protection class
IRated current
IST Starting current
ISF Rated current at service factor
P1Power consumption
P2Rated power
URated voltage
fFrequency
Cos φ Motor efficiency
SF Service factor
OTSOperating mode: immersed
OTEOperating mode: non-immersed
AT Starting mode
IMorg Impeller diameter: original
IMkorr Impeller diameter: corrected
*The date of manufacture is given according to ISO8601: JJJJWww
▪JJJJ = Year
▪W = Abbreviation for week
▪ww = Specified calendar week
4.7 Type key Example: Wilo-EMU FA 10.82E + HC 20.1-4/22KEx-E3
Wilo-Rexa SUPRA-V10-736A + HC 20.1-4/22KEx-E3
Wilo-Rexa SOLID-Q10-345A + HC 20.1-4/22KEx-E3
Hydraulics type key "EMU FA"
FA Sewage pump
10 x10 = nominal diameter of pressure connection
82 Internal performance coefficient
EImpeller shape:
W = vortex impeller

en-US Product description
16 WILO SE 2019-01
Example: Wilo-EMU FA 10.82E + HC 20.1-4/22KEx-E3
Wilo-Rexa SUPRA-V10-736A + HC 20.1-4/22KEx-E3
Wilo-Rexa SOLID-Q10-345A + HC 20.1-4/22KEx-E3
E = single-channel impeller
Z = two-channel impeller
D = three-channel impeller
V = four-channel impeller
T = closed two-channel impeller
G = semi-open single-channel impeller
Hydraulics type key "Rexa SUPRA"
SUPRA Sewage pump
V
Impeller shape:
V = vortex impeller
C = single-channel impeller
M = multi-channel impeller
10 x10 = nominal diameter of pressure connection
73 Internal performance coefficient
6Pump curve number
A
Material version:
A = standard version
B = corrosion protection 1
D = abrasion protection 1
X = special configuration
Hydraulics type key "Rexa SOLID"
SOLID Sewage pump with SOLID impeller
Q
Impeller shape:
T = closed two-channel impeller
G = semi-open single-channel impeller
Q = semi-open two-channel impeller
10 x10 = nominal diameter of pressure connection
34 Internal performance coefficient
5Pump curve number
A
Material version:
A = standard version
B = corrosion protection 1
D = abrasion protection 1
X = special configuration
Motor type key
HC Self-cooling motor with separate cooling circuit
20 Size
1Internal code figure
4Number of poles
22 Package length in cm
KSeal version
Ex With Ex approval
E3 IE-efficiency class (derived from IEC60034-30)
4.8 Scope of delivery ▪Pump with free cable end
▪Cable length per customer request
▪Mounted accessories, e.g. external pencil electrode, pump foot, etc.
▪Installation and operating instructions
4.9 Accessories ▪Guide system

Transport and storage en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 17
▪Pump foot
▪Special versions with Ceram coatings or special materials
▪External pencil electrode for sealing chamber control
▪Level controls
▪Fixing accessories and chains
▪Switchgears, relays, and plugs
5 Transport and storage
5.1 Delivery Following receipt of the shipment the shipment must be immediately checked for defects
(damage, completeness). Any existing defects must be noted on the freight documentation!
Furthermore, the defects must be reported to the transport company or manufacturer on
the date of receipt. Claims reported after this date can no longer be invoked.
5.2 Transport
WARNING
Standing under suspended loads!
People must not stand under suspended loads! There is a risk of (serious) injury due to
falling parts. The load must not be moved over the work areas in which people are
present!
WARNING
Head and foot injuries due to a lack of protective equipment!
During work there is a risk of (serious) injury. Wear the following protective equipment:
• Safety shoes
• If lifting equipment is used, a protective helmet must also be worn.
NOTICE
Use only technically faultless lifting equipment!
Use only technically faultless lifting equipment to lift and lower the pump. Make sure
that the pump does not jam during lifting and lowering. Do not exceed the maximum
bearing capacity of the lifting equipment! Check that lifting equipment is functioning
properly before use!
To protect the pump from damage during transport, only remove the outer packaging at the
operation site. Pack used pumps for shipping in tear-proof plastic bags of sufficient size so
that they are leakproof.
Furthermore, observe the following points:

en-US Transport and storage
18 WILO SE 2019-01
Fig.2: Attachment point
▪Adhere to national safety regulations.
▪Use legally specified and permitted lifting gear.
▪Select lifting gear according to the present conditions (weather, attachment point, load
etc.).
▪Only attach lifting gear to attachment points. The fixation must be made with a shackle.
▪Use lifting equipment with sufficient bearing capacity.
▪The standard safety of the lifting equipment must be guaranteed during application.
▪When using lifting equipment, get a second person to coordinate the procedure if necessary
(e.g. view blocked).
5.3 Storage
DANGER
Danger due to fluids which are hazardous to health!
When the pump is used in fluids which are hazardous to health, decontaminate the pump
after removal and before all work! There is a risk of fatal injury! Observe information from
the work regulations! The operator must ensure that the personnel have received and
read the work regulations!
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction port. There is a danger of limbs being
severed! Protective gloves must be worn against cutting injuries.
CAUTION
Total loss due to moisture penetration
Moisture penetration in the power supply cable damages the power supply cable and the
pump! Never immerse the end of the power supply cable in a liquid and tightly seal during
storage.
Newly delivered pumps can be stored for a year. Regarding storage for more than one year
contact customer service.
Observe the following points regarding storage:
▪Place the pump upright (vertical) on a firm bearing surface and secure it against slipping
and falling over!
▪The max. storage temperature is -15°C to +60°C (5°F to 140°F) at a max. relative humidity
of 90%, non-condensing. Frost-proof storage at a temperature of 5°C to 25°C (41°F to
77°F) with relative humidity of 40% to 50% is recommended.
▪Do not store the pumps in rooms in which welding works are carried out. The resulting gases
or radiations could corrode the elastomer parts and coatings.
▪Tightly seal suction and pressure connection.
▪Protect power supply cable against kinking and damage.
▪Protect pump from direct sunlight and heat. Extreme heat may lead to damage to the im-
pellers and coating!

Installation and electrical connection en-US
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 19
▪Rotate the impellers by 180° at regular intervals (3–6months). This prevents jamming of
the bearings and it renews the film of lubrication on the mechanical seal. WARNING!There
is a danger of injury due to sharp edges on the impeller and suction port!
▪The elastomer parts and coatings become brittle over time. When stored for more than
6months, customer service must be consulted.
Following storage, clean the dust and oil from the pump and check the coating for damage.
Repair damaged coatings before further use.
6 Installation and electrical con-
nection
6.1 Personnel qualifications ▪Electrical work: A qualified electrician must carry out the electrical work.
▪Installation-/dismantling work: The technician must be trained to handle the necessary tools
and required fastening materials for the present building site.
6.2 Installation methods ▪Vertical stationary wet well installation with guide system
▪Vertical portable wet well installation with pump foot
▪Vertical stationary dry well installation
The following installation methods are not permissible:
▪Horizontal installation
6.3 Operator’s obligations ▪Locally applicable accident prevention and trade association safety provisions must be ob-
served.
▪Observe all regulations for working with and underneath heavy suspended loads.
▪Make available protective equipment and ensure that the personnel wear the protective
equipment.
▪Observe the local regulations of sewage technology for the operation of sewage systems.
▪Avoid pressure surges!
Pressure surges may arise in long discharge pipes with pronounced route profile. These
pressure surges could lead to pump destruction!
▪Depending on the operating conditions and the pump chamber size ensure the cooling time
of the motor.
▪To allow the product to be fixed securely and functionally, the structural components and
foundations must be of sufficient stability. The operator is responsible for the provision and
suitability of the structural components and foundations!
▪Check that the available consulting documents (installation plans, layout of the operating
space, intake ratios) are complete and correct.
6.4 Installation
DANGER
Risk of fatal injury due to dangerous lone working practices!
Working in pump chambers and tight spaces as well as working where there is a danger
of falling is dangerous work. This work must not be carried out alone! A second person
must be present for safety reasons.
WARNING
Hand and foot injuries due to a lack of protective equipment!
During work there is a risk of (serious) injury. Wear the following protective equipment:
• Safety gloves that protect against cuts
• Safety shoes
• If lifting equipment is used, a protective helmet must also be worn.

en-US Installation and electrical connection
20 WILO SE 2019-01
NOTICE
Use only technically faultless lifting equipment!
Use only technically faultless lifting equipment to lift and lower the pump. Make sure
that the pump does not jam during lifting and lowering. Do not exceed the maximum
bearing capacity of the lifting equipment! Check that lifting equipment is functioning
properly before use!
▪Prepare operating space/installation site as follows:
– Clean, cleaned of coarse solids
– Dry well
– Frost-free
– Decontaminated
▪If toxic or suffocating gases build up, immediately take countermeasures!
▪Attach the lifting gear to the attachment point using a shackle. Only use technically ap-
proved lifting gear.
▪Use lifting gear for lifting, lowering and transporting the pump. Never pull the pump by the
power supply cable!
▪Lifting equipment must be safely installed. The storage location as well as the operating
space/installation site must be accessible with the lifting equipment. The storage location
must have a firm surface.
▪The routed power supply cables must allow safe operation. Check whether the cable cross
section and the cable length are sufficient for the selected installation type.
▪When using switchgear, the corresponding IP class must be observed. Install switchgear in a
manner that is overflow-proof and outside potentially explosive areas!
▪Avoid air intake into the fluid, use guide or deflector plates for the inlet. Entrained air can
collect in the pipe system and lead to impermissible operating conditions. Eliminate air
pockets via the ventilation system!
▪Dry running of the pump is forbidden! Avoid air pockets in the hydraulics housing or in the
pipe system. Never fall below minimum water level. The installation of a dry-running pro-
tection is recommended!
6.4.1 Instructions for double pump op-
eration If several pumps are used in an operating space, minimum distances between the pumps and
the wall must be complied with. Here there is a difference in the distances depending on the
type of system: Alternating operation or parallel operation.
d
A2
A1
Fig.3: Minimum distances
d Diameter of the hydraulics housing
A1
Minimum distance from the wall:
- alternating operation: min. 0.3×d
- parallel operation: min. 1×d
A2
Distance discharge pipes
- alternating operation: min. 1.5×d
- parallel operation: min. 2×d
6.4.2 Maintenance work After a storage period of more than 6months, carry out the following maintenance tasks
before installation:
▪Rotate the impeller.
▪Check the oil in the sealing chamber.
▪Check the coolant.