Wilo Atmos BST User manual

Pioneering for You
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Wilo-Atmos BST
9221306 • Ed.01/2023-07
en Installation and operating instructions

Atmos BST 50 Hz
https://qr.wilo.com/278
Atmos BST 60 Hz
https://qr.wilo.com/3278

Fig. I: Atmos BST-P7 (Design mit Gewindeanschluss)
Fig. II: Atmos BST (Design mit Flnschanschluss)

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 5
Table of Contents
1 General information...................................................................6
1.1 About these instructions ..................................................... 6
1.2 Copyright ............................................................................... 6
1.3 Subject to change................................................................. 6
2 Safety...........................................................................................6
2.1 Identification of safety instructions................................... 6
2.2 Personnel qualifications....................................................... 7
2.3 Electrical work .......................................................................7
2.4 Transport................................................................................ 8
2.5 Installing/dismantling........................................................... 8
2.6 During operation ................................................................... 9
2.7 Maintenance work ................................................................9
2.8 Operator responsibilities....................................................10
3 Transport and storage .............................................................10
3.1 Transport inspection ..........................................................10
3.2 Transport for installation/dismantling purposes............11
3.3 Storage .................................................................................12
4 Intended use and misuse .........................................................13
4.1 Intended use........................................................................13
4.2 Misuse...................................................................................13
5 Product information.................................................................13
5.1 Type key...............................................................................13
5.2 Technical data .....................................................................14
5.3 Scope of delivery.................................................................15
5.4 Accessories ..........................................................................15
6 Description of the pump..........................................................15
6.1 Anticipated noise levels .....................................................15
7 Installation ................................................................................15
7.1 Personnel qualifications.....................................................16
7.2 Operator responsibilities....................................................16
7.3 Safety....................................................................................16
7.4 Preparing the installation...................................................17
8 Electrical connection ...............................................................19
9 Commissioning .........................................................................21
9.1 Filling and venting...............................................................21
9.2 Activation.............................................................................22
9.3 Switching off .......................................................................23
9.4 Operation .............................................................................23
10 Maintenance..............................................................................24
10.1 Maintenance work ..............................................................25
11 Faults, causes and remedies....................................................25
12 Spare parts ................................................................................27
12.1 Recommended stocking of spare parts for two-year con-
tinuous operation................................................................27
12.2 Spare parts list.....................................................................28
13 Disposal .....................................................................................28
13.1 Oils and lubricants...............................................................28
13.2 Information on the collection of used electrical and elec-
tronic products....................................................................28

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6 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
1 General information
1.1 About these instructions These instructions are an integral part of the product. Adherence to these instructions is a
requirement for the intended use and correct operation of the product:
•Read these instructions before commencing any work and keep them in an accessible
place at all times.
•Observe instructions and labelling on the pump.
•Observe local regulations where the pump is installed.
•No liability will be accepted for damage resulting from failure to follow these instruc-
tions.
The language of the original operating instructions is German. All other languages of these
instructions are translations of the original operating instructions.
1.2 Copyright WILO SE © 2023
The reproduction, distribution and utilisation of this document in addition to communica-
tion of its contents to others without express authorisation is prohibited. Offenders will be
held liable for payment of damages. All rights reserved.
1.3 Subject to change Wilo shall reserve the right to change the listed data without notice and shall not be liable
for technical inaccuracies and/or omissions. The illustrations used may differ from the ori-
ginal and are intended as an exemplary representation of the product.
2 Safety This chapter contains basic instructions for the individual life
cycles of the product. Failure to observe this information carries
the following risks:
•Danger to persons from electrical, mechanical and bacteriolo-
gical effects as well as electromagnetic fields
•Environmental damage from discharge of hazardous sub-
stances
•Damage to property
•Failure of important product functions
•Failure of required maintenance and repair procedures
Failure to observe the instructions will result in the loss of any
claims for damages.
The directions and safety instructions in the other sections
must also be observed!
2.1 Identification of safety
instructions
These installation and operating instructions set out safety in-
structions for preventing personal injury and damage to property,
which are displayed in different ways:
•Safety instructions relating to personal injury start with a signal
word and are preceded by a corresponding symbol.
•Safety instructions relating to property damage start with a
signal word and are displayed without a symbol.
Signal words
•DANGER!
Failure to follow the instructions will result in serious injury or
death!
•Warning!
Failure to follow instructions can lead to (serious) injury!

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 7
•Caution!
Failure to follow instructions can lead to property damage and
possible total loss.
•Notice!
Useful information on handling the product
Symbols
These instructions use the following symbols:
General danger symbol
Danger of electric voltage
Warning of hot surfaces
Warning of high pressure
Notices
2.2 Personnel qualifications Staff must:
•be instructed about locally applicable regulations governing ac-
cident prevention,
•have read and understood the installation and operating in-
structions.
Personnel must have the following qualifications:
•Electrical work: a qualified electrician must carry out the elec-
trical work.
•Installation/dismantling: The technician must be trained in the
use of the necessary tools and fixation materials.
•The product must be operated by persons who have been in-
structed on how the complete system functions.
•Maintenance work: The technician must be familiar with the
use of operating fluids and their disposal.
Definition of “qualified electrician”
A qualified electrician is a person with appropriate technical edu-
cation, knowledge and experience who can identify and prevent
electrical hazards.
The operator must confirm and ensure the field of authority, the
competence and the monitoring of the personnel. If the person-
nel do not possess the necessary knowledge, they must be
trained and instructed. If required, this can be carried out by the
product manufacturer at the operator’s request.
2.3 Electrical work •Have electrical work carried out by a qualified electrician.
•When connecting to the mains supply, comply with the nation-
ally applicable guidelines, standards and regulations as well as
specifications issued by the local energy supply companies.

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8 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
•Before commencing work, disconnect the product from the
mains and secure it against being switched on again.
•Give staff training on how to establish the electrical connection
and the methods for switching off the product.
•Protect the electrical connection with a residual-current device
(RCD).
•Observe the technical information in these installation and op-
erating instructions as well as on the rating plate.
•Earth the product.
•Comply with the manufacturer’s specifications when connect-
ing the product to electrical switching systems.
•Have a defective connection cable replaced immediately by a
qualified electrician.
•Never remove operating elements.
•Comply with the specifications on electromagnetic compatibil-
ity when using electronic start-up controllers (e.g. soft starter
or frequency converter). If required, consider special measures
(shielded cables, filters, etc.).
2.4 Transport •Wear protective equipment:
–Safety gloves for protection against cuts
–Safety shoes
–Sealed safety glasses
–Safety helmet (when using lifting equipment)
•Only use legally specified and approved lifting slings.
•Select the lifting sling based on the prevailing conditions
(weather, slinging point, load etc.).
•Always attach the lifting sling to the designated slinging points
(lifting eyes).
•Position the lifting accessory in a way that ensures stability
during use.
•When using lifting equipment, a second person must be
present to coordinate the procedure if required (e.g. if the op-
erator’s field of vision is blocked).
•Persons must not stand underneath suspended loads. Do not
move suspended loads over workplaces where people are
present.
2.5 Installing/dismantling •Wear protective equipment:
–Safety shoes
–Safety gloves for protection against cuts
–Safety helmet (when using lifting equipment)
•Locally applicable laws and regulations on work safety and ac-
cident prevention must be complied with.

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 9
•The procedure described in the installation and operating in-
structions for shutting down the product/unit must be strictly
observed.
•Disconnect the device from the mains and secure it against be-
ing switched on again without authorisation.
•All rotating parts must be at a standstill.
•Close the gate valve in the inlet and in the discharge line.
•Provide adequate aeration in enclosed spaces.
•Make sure that there is no risk of explosion when carrying out
any type of welding work or work with electrical devices.
2.6 During operation •The operator must immediately notify the person in charge of
every fault or irregularity.
•If hazardous defects occur, the operator must immediately de-
activate the device. Hazardous defects include:
–Malfunction of safety and monitoring devices
–Damage to housing parts
–Damage to electrical equipment
•Collect any leakage of fluids and operating fluids immediately
and dispose of it according to the locally applicable guidelines.
•Tools and other objects should only be kept in their designated
places.
2.7 Maintenance work •Wear protective equipment:
–Sealed safety glasses
–Safety shoes
–Safety gloves for protection against cuts
•Locally applicable laws and regulations on work safety and ac-
cident prevention must be complied with.
•The procedure described in the installation and operating in-
structions for shutting down the product/unit must be strictly
observed.
•Only perform the maintenance work described in these installa-
tion and operating instructions.
•Only original parts from the manufacturer may be used for
maintenance and repairs. The use of any non-original parts re-
leases the manufacturer from any liability.
•Disconnect the device from the mains and secure it against be-
ing switched on again without authorisation.
•All rotating parts must be at a standstill.
•Close the gate valve in the inlet and in the discharge line.
•Collect any leakage of fluid and operating fluid immediately and
dispose of it according to the locally applicable guidelines.
•Store tools at the designated locations.
•After completing work, reattach all safety and monitoring
devices and check that they function properly.

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10 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
2.8 Operator responsibilities •Provide installation and operating instructions in a language
which the personnel can understand.
•Make sure that personnel are suitably trained for the specified
work.
•Verify the area of responsibility and individual responsibilities
of personnel.
•Provide the necessary protective equipment and make sure
that personnel wear it.
•Ensure that safety and information signs mounted on the
device are always legible.
•Train personnel with regard to the operating principles of the
system.
•Eliminate risks from electrical current.
•Equip hazardous components (extremely cold, extremely hot,
rotating, etc.) with a guard to be provided by the customer.
•Remove leakages of hazardous fluids (e.g. explosive, toxic or
hot) in such a way that no danger is posed to persons or the en-
vironment. Comply with national statutory provisions.
•Keep highly flammable materials at a safe distance from the
product.
•Ensure compliance with the regulations for accident preven-
tion.
•Ensure compliance with local directives or general directives
[e.g. IEC, VDE, etc.] and instructions from local energy supply
companies.
Follow all information that appears on the product and ensure
that it remains permanently legible:
•Warning and hazard notices
•Rating plate
•Direction of rotation arrow/symbol for direction of flow
•Labelling of connections
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 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 chil-
dren without supervision.
3 Transport and storage
3.1 Transport inspection Check delivery immediately for damage and completeness. Defects must be noted on the
freight documentation! Defects must be notified to the transport company or the manu-
facturer immediately on the day of receipt of shipment. Subsequently notified defects can
no longer be claimed for.
Only remove the outer packaging at the place of utilisation to ensure that the pump is not
damaged during transport.

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 11
3.2 Transport for installation/dismant-
ling purposes
Existing regulations for the prevention of accidents must be followed!
WARNING
Risk of injury from a lack of protective equipment!
Danger of (serious) injuries during work. Wear the following protective
equipment:
• Safety gloves for protection against cuts
• Safety shoes
• Safety helmet must be worn if lifting accessories are used!
WARNING
Risk of personal injury!
Incorrect transport can lead to personal injury!
• Unload boxes, lathed spaces, pallets or cartons, depending on the size
and construction, with forklift trucks or with slings.
• Always lift heavy parts of more than 30kg with hoisting gear that is in
accordance with local regulations.
– The bearing capacity has to be adapted to the weight!
• Transport the pump using approved lifting gear (block and tackle,
crane etc.). Lifting gear must be attached to the pump flanges and, if
necessary, to the outer motor diameter.
– Securing against slipping is required for this!
• When lifting machines or parts with eyelets, only use load hooks or
shackles that are in accordance with local safety regulations.
• The transport lugs on the motor are only for transporting the motor.
They are not approved for transporting the complete pump.
• If load chains or ropes are put over sharp edges, a guard has to be
used or they have to be put through the eyelets.
• When using a block and tackle or similar hoisting gear, make sure that
the load is lifted vertically.
• Prevent the suspended load from swinging.
– Swinging can be avoided by using a second block and tackle. The
direction of pull of both block and tackles must be less than 30° to
the vertical.
• Never subject load hooks, eyelets or shackles to bending forces-their
load axes have to be in the direction of the tractive forces!
• When lifting, make sure that the load limit of a load rope is reduced
for diagonal pulling.
– The safety and effectiveness of a stranding is best ensured when
all load-bearing elements are loaded in the vertical direction to the
greatest extent possible. If required, use a lifting arm which can be
attached vertically to the load rope.
• Set up a safety zone in such a way that there is no danger if the load
or a part of the load slips or the hoisting gear breaks or tears.
• Never leave a load longer than necessary in a suspended position! En-
sure there is no danger to personnel when accelerating and slowing
down during the lifting procedure.

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12 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
3.2.1 Fitting load slings
Fig.1: Transporting the pump
For lifting with a crane, the pump must be supported by suitable belts or load ropes, as
shown. Place belts or load ropes in loops around the pump, which tighten from the pump’s
own net weight.
The transport lugs on the motor are only for guiding when the load is being carried! Never
lift or transport the load only by the transport lugs.
WARNING
Damaged transport lugs can break off and cause considerable
personal injury.
• Check the transport lugs before use for damage and secure fixation.
DANGER
Danger of death from falling parts!
The pump itself and pump parts can have a very high net weight. Falling
parts pose a risk of cuts, crush injuries, bruises or impacts, which can be
fatal.
• Always use suitable lifting accessories and secure parts against falling.
• Never stand below a suspended load.
• During storage and transport, as well as before all installation and as-
sembly work, ensure that the pump is in a safe position and standing
securely.
WARNING
Personal injury due to unsecured installation of the pump!
If the motor support has been removed, the pump can fall over when
stationary and injure people.
• Never set the pump down without motor support.
3.3 Storage
CAUTION
Damage due to incorrect handling during transport and stor-
age!
Protect the product from moisture, frost and mechanical damage during
transport and temporary storage.
Leave stickers on the pipe connections so that no dirt and other foreign matter can get into
the pump housing.

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 13
To prevent scoring at the bearings and sticking, rotate the pump shaft once a week.
If a longer storage time is required, contact Wilo for preservation measures.
WARNING
Risk of injury due to incorrect transport!
If the pump is transported again at a later date, it must be packaged so
that it cannot be damaged during transport. Use the original packaging
for this or choose equivalent packaging.
4 Intended use and misuse
4.1 Intended use Pumps from the Atmos BST series are made entirely of AISI 304 and 316 stainless steel and
can therefore be used for pumping water as well as non-aggressive and slightly aggressive
fluids without solids in the following systems:
•Hot water heating systems
•Chilled and cooling water systems
•Water systems for industrial use
•Industrial circulation systems
•Heat transfer media circulation
•OEM application
Intended use includes compliance with these instructions as well as the information and
markings on the pump.
Any use beyond the intended use is considered misuse and will result in the loss of all liabil-
ity claims.
4.2 Misuse The operational reliability of the supplied product is only guaranteed for intended use in ac-
cordance with chapter "Intended use" of the installation and operating instructions. The
limit values must not fall below or exceed those values specified in the catalogue/data
sheet.
WARNING
Misuse of the pump can lead to dangerous situations and dam-
age!
Non-permitted substances in the fluid can destroy the pump. Abrasive
solids (e.g. sand) increase pump wear.
Pumps without an Ex rating are not suitable for use in potentially explos-
ive atmospheres.
• Never use fluids other than those approved by the manufacturer.
• Highly flammable materials/fluids should always be kept at a safe dis-
tance from the device.
• Never allow unauthorised persons to carry out work.
• Never operate the pump beyond the specified limits of use.
• Never carry out unauthorised conversions.
• Use authorised accessories and original spare parts only.
5 Product information
5.1 Type key Example:
Atmos BST 32/125-7.5/2-V4
Atmos Product family
BST (Block Stamped) Standard
32 Nominal diameter DN in mm on the discharge side
125 Impeller nominal diameter in mm
7.5 Rated power P2 in kW
2 Number of poles

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14 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
Example:
Atmos BST 32/125-7.5/2-V4
6 Without code: 50Hz version
6: 60Hz version
-V1 3~230/400 V, 50Hz
-V2 3~400/690 V, 50Hz
-V4 1~230 V, 50 Hz
-H12 Pump housing 1.4401
Table1: Type key
Example:
Atmos BST 25/160-1.1/2/6-V5
Atmos Product family
BST (Block Stamped) Standard
25 Nominal diameter G1 in mm on the discharge side
(female thread)
160 Impeller nominal diameter in mm
1.1 Rated power P2 in kW
2 Number of poles
6 Without code: 50Hz version
6: 60Hz version
-V5 3~220/380 V, 60Hz
-V9 1~208...230V, 60Hz
-H12 Pump housing 1.4401
Table2: Type key
5.2 Technical data Property Value Note
Rated speed 2900rpm
Nominal diameters DN DN32...DN100mm
G1...G1½
Pipe and pressure measure-
ment connections
Flange PN16 in accordance
with DINEN1092-1
Permissible min./max. fluid
temperature
-20°C…+120°C with mech-
anical seal
Maximum permissible ambi-
ent temperature
+50°C
Max. permissible operating
pressure
10bar
Insulation class F
Protection class IP55
Permissible fluids Heating water in accordance
with VDI 2035 part 1 and part
2
Process water
Cooling/chilled water
Water-glycol mixture1)
Heat-conducting oil
Standard version
Standard version
Standard version
Standard version
Special version
Permissible fluids Other fluids (on request) Special version (at addi-
tional charge)

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 15
Property Value Note
Electrical connection 1~220V, 50Hz (≤2.2kW)
3~220V, 50Hz (≤3kW)
3~380V, 50Hz (>3kW)
Standard version
Standard version
Standard version
1)Note that water-glycol mixtures or fluids with a viscosity that is different to that of pure
water increase the power consumption of the pump.
The pumping data must be adjusted according to the higher viscosity of the fluid, regard-
less of the proportion of viscous substances.
Only use brand products with anti-corrosion inhibitors. Strictly follow the manufacturer’s
instructions and safety data sheets!
When ordering spare parts, specify all data on the pump/motor rating plate.
Table3: Technical data
5.3 Scope of delivery •Pump
•Installation and operating instructions
5.4 Accessories Accessories must be ordered separately.
See catalogue for detailed list.
6 Description of the pump Monobloc pump, installation dimensions and hydraulics according to DINEN733. The
pumps can be installed directly in a sufficiently anchored pipe as an in-line pump or placed
on a base.
Pump with feet screwed to the pump housing.
For threaded pipe union pumps with screwed-on motor support.
6.1 Anticipated noise levels Expected noise values as guideline.
Motor power P2
[kW]
Measuring surface sound-pressure level Lp, A [dB(A)] 1)
2900rpm
0.55 73.1
0.75 74.4
1 75.6
1.1 76.0
1.5 77.3
1.85 78.2
2.2 78.9
3 80.2
4 81.4
5.5 82.8
7.5 84.1
9.2 84.9
11 85.7
15 87.0
18.5 87.9
22 88.6
30 89.9
37 90.8
1) Spatial mean value of sound-pressure levels on a square measuring surface at a distance
of 1m from the surface of the motor.
Table4: Anticipated noise levels (50Hz)

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16 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
7 Installation
7.1 Personnel qualifications •Installation/dismantling: The technician must be trained in the
use of the necessary tools and fixation materials.
7.2 Operator responsibilities •Observe national and regional regulations!
•Observe locally applicable accident prevention and safety regu-
lations of professional and trade associations.
•Provide protective equipment and ensure that the protective
equipment is worn by personnel.
•Observe all regulations for working with heavy loads.
7.3 Safety DANGER
Danger of death due to lack of protective devices!
Due to missing protective devices of the terminal box or near the coup-
ling/motor, electric shock or contact with rotating parts can lead to life-
threatening injuries.
• Before commissioning, safety devices such as coupling covers that
were removed must be reinstalled!
DANGER
Danger of death from falling parts!
The pump itself and pump parts can have a very high net weight. Falling
parts pose a risk of cuts, crush injuries, bruises or impacts, which can be
fatal.
• Always use suitable lifting accessories and secure parts against falling.
• Never stand below a suspended load.
• During storage and transport, as well as before all installation and as-
sembly work, ensure that the pump is in a safe position and standing
securely.
WARNING
Hot surface!
The entire pump can become very hot. There is a risk of burns!
• Allow the pump to cool down before commencing any work!
WARNING
Risk of scalding!
At high fluid temperatures and system pressures, allow the pump to cool
down first and then depressurise the system.
CAUTION
Damage to the pump due to overheating!
The pump must not be allowed to run dry for more than 1minute. Dry
running causes a build-up of energy in the pump, which can damage the
shaft, impeller, and mechanical seal.
• Make sure that the volume flow does not fall below the minimum
value Qmin.
Calculation of Qmin:

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 17
Qmin = 10% xQmax pump
7.4 Preparing the installation Check whether the pump complies with the specifications on the delivery note; report any
damage or missing parts to Wilo immediately. Check slatted crates/boxes/wrapping for
spare parts or accessory components that could be included with the pump.
WARNING
Risk of personal injury and property damage due to improper
handling!
• Never set up the pump unit on unfortified surfaces or surfaces that
cannot bear loads.
• Flush the pipeline system if required.
– Dirt can cause the pump to fail.
• Install only after completion of all welding and soldering work and
after the pipeline system has been flushed, if required.
• Observe the minimum axial distance between a wall and the fan cover
of the motor: 200mm + diameter of the fan cover.
NOTICE
Simplify subsequent work on the unit!
• To ensure the entire unit does not have to be emptied, install shut-off
valves upstream and downstream of the pump.
NOTICE
The motor terminal box must not face downward.
7.4.1 Installation location •The pump must be protected from the weather and installed in a frost-/dust-free, well
ventilated, oscillation-isolated environment that is not potentially explosive. The pump
must not be installed outdoors! Observe the specifications in “Intended use” section!
•Mount the pump in a readily accessible place. This makes it easier to complete inspec-
tions, maintenance or replacement in the future.
Lay the suction pipe as short as possible.
•Install a device for attaching hoisting gear above the set-up site of the pumps. Total
weight of the pump: see catalogue or data sheet.
7.4.2 Base The pump units can be mounted on their foundations in many different ways. The type of
fixation depends on the size and location of the pump unit as well as noise and vibration
regulations.
NOTICE
For some pump types, simultaneous separation of the foundation block
itself from the building structure by means of an elastic intermediate
layer (e.g. cork or MAFUND® plate) is required for vibration-insulated in-
stallation.

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18 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
CAUTION
A faulty foundation or incorrect installation of the unit!
A faulty foundation or incorrect installation of the unit on the foundation
can lead to defects of the pump.
These defects are not covered by the warranty.
• Allow the concrete foundation to harden before installing the pump
unit. The surface must be flat and even.
• Never set up the pump unit on unfortified surfaces or surfaces that
cannot bear loads.
The baseplate must be mounted on a firm base. The foundation must be made of high-
quality concrete of sufficient thickness.
The baseplate must not be warped or pulled down on the surface of the foundation. It must
be supported so that the original alignment remains unchanged.
To anchor the baseplate sufficiently, the dimensions of the fastening screws are selected/
recommended in accordance with holes drilled in the baseplate:
Drilled hole in the base-
plate
∅ [mm]
Thread Screw length
[mm]
Thread length
[mm]
12 M10 120 36
15 M12 160 40
18.5 M16 200 50
Fig.2: Example of a foundation screwed con-
nection
•Align the complete unit with the help of a spirit level when installing it on the foundation.
•Always fit a damper (B) between damping foundation (D) and pedestal (F) on left and right
in the immediate vicinity of the fixation material (e.g. stone bolts (A)) between the base-
plate (E) and damping foundation (D).
•Tighten fixing material evenly and securely.
•To further reduce vibration. after fixing. the base can be grouted with mortar which is as
vibration-free as possible via opening as far as the upper edge. Hollow spaces are to be
avoided here.
7.4.3 Permissible forces and torques on
the pump flanges
DN Forces F [N] Torques M [Nm]
FXFYFZΣ Forces F MXMYMZΣ Torques M
Discharge and suction flange
32 367.5 315.0 297.5 367.5 385.0 262.5 297.5 385.0
40 385.0 350.0 437.5 437.5 455.0 315.0 367.5 455.0
50 525.0 472.5 577.5 577.5 490.0 350.0 402.5 490.0
65 647.5 595.0 735.0 735.0 525.0 385.0 420.0 525.0
80 787.5 717.5 875.0 875.0 560.0 402.5 455.0 560.0
100 1050.0 945.0 1172.5 1172.5 595.0 437.5 507.5 595.0
Table5: Permissible forces and torques on pump flanges
If not all working loads reach the maximum permitted values, one of these loads may exceed
the normal limit value. Provided that the following additional conditions are fulfilled:
•All force and torque components are limited to 1.4times the maximum permitted value.
•The forces and torques acting on each flange meet the requirements of the compensation
equation.

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Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07 19
Fig.3: Compensation equation
Σ Feffective and Σ Meffective are the arithmetic sums of the effective values of both pump flanges
(inlet and outlet). Σ Fmax. permitted and Σ Mmax. permitted are the arithmetic sums of the maximum per-
mitted values of both pump flanges (inlet and outlet). The algebraic signs of Σ F and Σ M are
not considered in the compensation equation.
7.4.4 Connection of the pipes
CAUTION
Risk of damage due to incorrect handling!
The pump may never be used as a fixed point for the pipe.
r
5 x DN
d s
r §2,5 · (d - 2s)
Fig.4: Settling section upstream and down-
stream of the pump
•The present NPSH of the system always has to be greater than the required NPSH of the
pump.
•The forces and torques being exerted by the pipeline system on the pump flange (e.g., by
warping, thermal expansion) may not exceed the permitted forces and torques.
•The pipes and pump must be free of mechanical stress when installed.
•The pipes must be fixed in such a way that the pump does not have to support the weight
of the pipes.
•The suction line is to be kept as short as possible. Lay the suction line to the pump so that
it continuously rises while the inlet falls. Avoid possible air entry points.
•If a dirt trap in the suction line is required, its free cross-section has to be 3–4 times the
cross-section of the pipe.
•For short pipes, the nominal diameters must be at least those of the pump connections.
For long pipes, determine the most economical nominal diameter in each case.
•To avoid higher pressure losses, make adapters for larger nominal diameters with an ex-
tension angle of approx.8.
•Minimum axial distance between a wall and the fan cover of the motor: free removal di-
mension of at least 250mm+ø of the fan cover.
NOTICE
Avoid flow cavitation!
• A settling section must be provided upstream and downstream of the
pump in the form of a straight pipe. The length of the settling section
must be at least 5times the nominal diameter of the pump flange.
•Remove the flange covers at the suction and discharge ports of the pump before attach-
ing the piping.
7.4.5 Final check •Tighten the foundation bolts if necessary.
•Check all connections for correctness and function.
•It must be possible to turn the pump shaft by hand.
8 Electrical connection •Electrical work: a qualified electrician must carry out the electrical work.
NOTICE
Nationally applicable guidelines, standards and regulations as well as the
requirements of local energy supply companies must be observed!
CAUTION
Risk of material damage caused by improper electrical connec-
tion!
• Ensure that the current type and voltage of the mains connection cor-
respond to the specifications on the motor rating plate.

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20 Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
DANGER
Risk of fatal electrical shock!
Immediate danger of death if live components are touched!
• Check whether all connections are voltage-free!
•Main fuse: depending on the rated motor current.
•Earth the pump according to the instructions.
•Lay the connection cables so that they do not touch the piping or the pump or motor
housing.
NOTICE
The connection diagram for the electrical connection is located in the
terminal box.
Fig.5: Alternating current
The special motor model is fitted with passive thermal control. This thermal control can be
connected via the corresponding terminals in the terminal box.
The passive thermal control should always be connected to the thermal trip mechanism!
CAUTION
Risk of material damage!
Only a max. voltage of 7.5VDC may be applied to the terminals of the
passive thermal control. A higher voltage will destroy the PTC thermistor
sensor.
•It is advisable to install a motor protection switch.
Fig.6: Y-Δ-connection
Setting the motor protection switch:
•Direct starting current: The information on the motor rating plate pertaining to the rated
current must be observed for the installation.
•Y-Δ start: If the motor protection switch is switched in the supply line to a Y-Δ contactor
combination, adjust the switch as for direct starting. If the motor protection switch is
switched in a thread of the motor supply line (U1/V1/W1 or U2/V2/W2), set the motor
protection switch to the value 0.58xrated motor current.
•The mains connection depends on the motor powerP2, mains voltage and activation type.
Refer to the following table and Fig.4 andFig. 5 for the required connection of the con-
necting bridges in the terminal box.
Activation type Motor power
P2≤3kW
Motor power
P2>3kW
Motor power
P2<2.2kW
Mains voltage
3∼230V
Mains voltage
3∼400V
Mains voltage
3∼380V
Mains voltage
1∼230V
Direct Δ-connection
(Fig.5)
Y-connection
(Fig.5)
Δ-connection
(Fig.5)
Connection
(Fig.4)
Y-Δ start Remove con-
nection bridges.
Fig.5 (Y)
Not possible Remove con-
nection bridges.
Fig.5 (Y)
Table6: Terminal assignment
•When connecting automatic switchgears, observe the corresponding installation and op-
erating instructions.
•For three-phase current motors with Y-Δ connection, be sure that the switchover points
between star and delta are very close together in time. Longer switchover times can lead
to pump damage.
Recommended time setting for Y-Δ activation:
Motor power Time to be set
≤30kW <3seconds