Wilo Atmos GIGA-NHT User manual

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Wilo-Atmos GIGA-NHT
8249758 • Ed.01/2023-10
en Installation and operating instructions

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 3
Table of contents
1 General information ...................................................................4
1.1 About these instructions ..................................................... 4
1.2 Copyright ............................................................................... 4
1.3 Subject to change................................................................. 4
2 Safety...........................................................................................4
2.1 Identification of safety instructions .................................. 4
2.2 Personnel qualifications....................................................... 6
2.3 Electrical work....................................................................... 6
2.4 Transport................................................................................ 6
2.5 Installing/dismantling........................................................... 7
2.6 During operation................................................................... 7
2.7 Maintenance tasks................................................................ 9
2.8 Drive: IEC standard motor.................................................... 9
2.9 Operator responsibilities ...................................................10
3 Transportation and storage.................................................... 10
3.1 Delivery.................................................................................10
3.2 Transport..............................................................................10
3.3 Storage .................................................................................12
4 Application/use........................................................................ 12
4.1 Intended use........................................................................12
4.2 Improper use........................................................................12
5 Product description................................................................. 13
5.1 Design...................................................................................13
5.2 Operation with frequency converter ...............................13
5.3 Technical data .....................................................................13
5.4 Type key...............................................................................14
5.5 Scope of delivery.................................................................14
5.6 Accessories ..........................................................................14
5.7 Anticipated noise levels.....................................................14
5.8 Permissible forces and torques on the pump flanges ...16
6 Installation and electrical connection ................................... 16
6.1 Personnel qualifications.....................................................16
6.2 Operator responsibilities ...................................................16
6.3 Preparing the installation ..................................................17
6.4 Setting up the pump by itself (variantB, Wilo variant key)
...............................................................................................17
6.5 Installing the pump unit on a base...................................18
6.6 Pipework ..............................................................................19
6.7 Aligning the unit .................................................................20
6.8 Electrical connection..........................................................24
7 Commissioning......................................................................... 25
7.1 Personnel qualifications.....................................................26
7.2 Filling and venting ..............................................................26
7.3 Checking the direction of rotation...................................27
7.4 Switching on the pump......................................................27
7.5 Switching frequency...........................................................28
8 Shutdown ................................................................................. 28
8.1 Switching off the pump and temporary shutdown........28
8.2 Shutdown and storage.......................................................29
9 Maintenance/repair ................................................................. 29
9.1 Personnel qualifications.....................................................29
9.2 Operation monitoring ........................................................30
9.3 Maintenance tasks.............................................................. 30
9.4 Draining and cleaning ........................................................ 30
9.5 Dismantling ......................................................................... 30
9.6 Installation ........................................................................... 32
10 Faults, causes and remedies ...................................................35
10.1 Faults .................................................................................... 35
10.2 Causes and remedies.......................................................... 36
11 Spare parts................................................................................37
11.1 Spare parts list..................................................................... 38
12 Disposal..................................................................................... 39
12.1 Oils and lubricants ..............................................................39
12.2 Water-glycol mixture......................................................... 39
12.3 Protective clothing............................................................. 39
12.4 Information on the collection of used electrical and elec-
tronic products.................................................................... 39

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4 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
1 General information
1.1 About these instructions These installation and operating instructions are an integral part of the device. Read these
instructions before commencing work and keep them in an accessible place at all times.
Strict adherence to these instructions is a requirement for intended use and correctly oper-
ating the device. All specifications and markings on the device must be observed. These in-
stallation and operating instructions correspond to the relevant version of the device and
the underlying safety standards that apply at the time of going to print.
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 These installation and operating instructions have been copyrighted by the manufacturer.
The contents, of whatever type, may not be reproduced or distributed, or used for purposes
of competition and shared with others.
1.3 Subject to change The manufacturer reserves the right to make technical modifications to the device or indi-
vidual components. The illustrations used may differ from the original and are intended as
an example representation of the device.
2 Safety This chapter contains basic information for the individual phases
of the life cycle. Failure to observe this information carries the
following risks:
•Injury to persons from electrical, mechanical and bacteriological
factors as well as electromagnetic fields
•Environmental damage from discharge of hazardous sub-
stances
•Property damage
•Failure of important functions of the product
Failure to observe the information contained herein will result in
the loss of claims for damages.
The instructions and safety instructions in the other chapters
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.
These safety instructions are shown differently:
•Safety instructions relating to personal injury start with a signal
word, are preceded by a corresponding symbol and are shaded
in grey.
DANGER
Type and source of the danger!
Consequences of danger and instructions for avoidance.
•Safety instructions relating to property damage start with a
signal word and are displayed without a symbol.
CAUTION
Type and source of the danger!
Consequences or information.

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 5
Signal words
•DANGER!
Failure to follow the instructions will result in serious injuries or
death!
•WARNING!
Failure to follow the instructions can lead to (serious) injury!
•CAUTION!
Failure to follow the instructions can lead to potentially irrepar-
able property damage.
•NOTICE!
Useful information on handling the product
Symbols
These instructions use the following symbols:
Danger – high voltage
General warning symbol
Warning – danger of crushing
Warning – risk of cutting injuries
Warning – hot surfaces
Warning – high pressure
Warning – suspended loads
Personal protective equipment: wear a safety helmet
Personal protective equipment: wear foot protection
Personal protective equipment: wear hand protection
Personal protective equipment: wear mouth protec-
tion
Personal protective equipment: wear safety goggles
Useful information

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6 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
2.2 Personnel qualifications Personnel 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 must be carried out by a qualified tech-
nician who is trained in the use of the necessary tools and fixa-
tion materials.
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.
2.3 Electrical work •Electrical work must be carried out by a qualified electrician.
•When connecting to the mains, comply with the locally applic-
able laws and regulations of the local energy supply company.
•Before commencing work, disconnect the device from the
mains and secure it against being switched on again without
authorisation.
•Train personnel on how to make the electrical connection as
well as on the methods for switching off the device.
•Observe the technical information in these installation and op-
erating instructions as well as on the rating plate.
•Earth the device.
•Observe the manufacturer’s specifications when connecting to
electrical switching systems.
•Comply with the specifications on electro-magnetic compatib-
ility when using electronic start-up controllers (e.g. soft starter
or frequency converter). If required, take into account special
measures (shielded cables, filters, etc.).
•Replace defective connection cables. Contact customer service.
2.4 Transport •Wear protective equipment:
–Safety gloves for protection against cuts
–Safety shoes
–Sealed safety goggles
–Safety helmet (when using lifting equipment)
•Only use legally specified and approved lifting gear.
•Select lifting gear based on the available conditions (weather,
attachment point, load, etc.).
•Always attach the lifting gear to the designated attachment
points (lifting eyes).

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 7
•Position the lifting equipment 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.
Please note the following information during transport and
prior to installation:
•Do not reach into suction ports, discharge ports or other open-
ings.
•Avoid the penetration of foreign objects. To this end, leave the
protective covers or packaging on until they have to be re-
moved for installation.
•Packaging and covers may be removed from suction or outlet
openings for inspection purposes. They must be put back on
afterwards to protect the pump and ensure safety.
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.
•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 pressure pipe.
•Provide adequate aeration in enclosed spaces.
•Clean the device thoroughly. Disinfect devices that use fluids
hazardous to health!
•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 •Wear protective equipment:
–Safety shoes
–Safety helmet (when using lifting accessories)
•The work area in which the product is used is not a recreational
area. No persons are allowed in the work area during operation.
•The operator must report any faults or irregularities to a line
manager immediately.

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8 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
•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
•Open all gate valves in the piping on both the suction and dis-
charge sides.
•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.
Thermal hazards
Most pump and drive surfaces can become very hot or very cold
during operation.
Surfaces may only be touched with extreme caution and safety
gloves must be worn.
In the case of fluids with high temperatures and high system
pressures, let the pump cool down before carrying out any work
on the pump.
Depending on the fluid temperature and system pressure, ex-
tremely hot or extremely cold fluid may escape when the venting
screw is opened completely. The fluid can escape in liquid or va-
pour form or shoot out under high pressure.
•Always open the venting screw slowly and carefully.
Make sure that the drained water is not too hot or cold for more
intensive contact with skin.
Use suitable devices to protect components that can reach ex-
treme temperatures against contact.
Hazard due to articles of clothing or other objects being caught
To avoid the dangers presented by the rotating parts of the
product:
•Do not wear loose or frayed clothing or jewellery.
•Do not dismantle devices for protecting against accidental con-
tact with moving parts (e.g. coupling guard).
•Only put the device into operation once this protection is in
place.
•The devices for protecting against accidental contact with
moving parts may only be removed when the system is at a
standstill.
Hazards due to noise
Observe the sound pressure specifications on the motor rating
plate. The sound pressure value of the pump is generally about
the same value as that of the motor +2dB(A).

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 9
Observe the applicable health and safety regulations. If the device
is operated under normal operating conditions, the operator must
measure the sound pressure.
Sound pressure levels of 80dB(A) and above must be noted in the
work regulations! The operator must also introduce the following
preventative measures:
•Inform the operating personnel
•Provide hearing protection
For a sound pressure level of 85dB(A) and above, the operator
must:
•Make it a mandatory requirement to wear hearing protection
•Demarcate the noisy areas.
•Take measures to reduce noise (e.g. insulation, noise barriers)
Leakages
In the case of a leakage, a jet of steam at a very high temperature
and pressure can escape or shoot out from the leakage point!
Observe local standards and regulations. Protect persons and the
environment against hazardous (explosive, toxic or hot) sub-
stances. Prevent pump leakages!
Ensure that a dry run of the pump is not possible. A dry run can
damage the shaft seal and thereby cause leakages.
2.7 Maintenance tasks In the case of fluids with high temperatures and high system
pressures, let the pump cool down before carrying out any work
on the pump.
•Wear the following protective equipment:
–Sealed safety glasses
–Safety shoes
–Safety gloves for protection against cuts
•Only carry out the maintenance tasks described in these install-
ation and operating instructions.
•Only original parts from the manufacturer may be used for
maintenance and repairs. Use of parts other than original parts
releases the manufacturer from any liability.
•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.
2.8 Drive: IEC standard mo-
tor
The hydraulics have a standardised connection flange for in-
stalling an IEC standard motor. See the technical data for the per-
formance data (e.g. size, construction, hydraulic rated power,
speed) needed to select a motor.

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10 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
2.9 Operator responsibilities The operator must:
•Provide the installation and operating instructions in a language
which the personnel can understand.
•Make sure that personnel are suitably trained for the specified
work.
•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 any risk from electrical current.
•Equip hazardous components (extremely cold, extremely hot,
rotating, etc.) with an on-site guard.
•Demarcate and cordon off the hazardous area.
•Define personnel responsibilities to ensure safe working prac-
tice.
Children and persons younger than 16years or with reduced
physical, sensory or mental capacities or limited experience are
prohibited from handling the device! Persons under the age of 18
must be supervised by a technician.
3 Transportation and storage
3.1 Delivery The pump is secured to a pallet ex works and is protected against dirt and moisture.
Check the shipment immediately on receipt for defects (damage, completeness). Defects
must be noted on the freight documentation. Any defects must be notified to the transport
company or the manufacturer immediately on the day of receipt of shipment. Subsequently
notified defects can no longer be asserted.
3.2 Transport
DANGER
Risk of fatal injury due to suspended loads!
Never allow anyone to stand under suspended loads! Danger of (serious)
injuries caused by falling parts. Loads may not be carried over work
places where people are present!
The safety zone must be marked so that there is no danger when the
load (or part of it) slips away or if the lifting device snaps or is ripped off.
Loads must never be suspended for longer than necessary.
Accelerations and braking during the lifting operation must be performed
in a way that rules out any danger to people.
WARNING
Hand and foot injuries due to lack of protective equipment!
Danger of (serious) injuries during work. Wear the following protective
equipment:
• Safety shoes
• Safety gloves for protection against cuts
• Sealed safety goggles
• Safety helmet must be worn if lifting equipment is used!

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 11
NOTICE
Use only properly functioning lifting equipment!
Use only properly functioning lifting equipment to lift and lower the
pump. Ensure that the pump does not become jammed during lifting and
lowering. Do not exceed the maximum bearing capacity of the lifting
equipment! Check that lifting equipment is functioning properly before
use!
CAUTION
Property damage due to incorrect transport
To ensure proper alignment, all equipment is pre-assembled. If dropped
or if improperly handled, there is a risk of misalignment or deficient per-
formance due to deformations. The pipes and valves will not withstand
loads and should not be used to secure loads in transit.
• Only use permitted lifting gear for transport. Ensure the stability of
the load since, with this particular pump design, the centre of gravity
is shifted to the top (top-heavy).
•Never attach lifting gear to shafts in order to lift the unit.
• Do not use the transport lugs on the pump or motor to lift the entire
unit. They are only meant for transporting the individual components
during installation or dismantling.
Only remove the outer packaging at the place of utilisation to ensure that the pump is not
damaged during transport.
CAUTION
Risk of damage due to incorrect packaging.
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.
3.2.1 Attaching the pump
Fig.1: Attaching the pump
•Comply with applicable national safety regulations.
•Use legally specified and approved lifting gear.
•Select the lifting gear based on the prevailing conditions (weather, attachment point,
load, etc.).
•Only attach the lifting gear to the attachment point. Fix in place with a shackle.
•Never feed the lifting gear over or through transport lugs without protection.
•Never feed the lifting gear over sharp edges without protection.
•Use lifting equipment with sufficient bearing capacity.
•The stability of the lifting equipment must be ensured during operation.
•When using lifting equipment, ensure a second person is present to coordinate the pro-
cedure if required (e.g. if the operator’s field of vision is blocked).
•When lifting, make sure that the load limit of the lifting gear is reduced when pulling at an
angle. The safety and efficiency of the lifting gear is best guaranteed when all load-bear-
ing elements are loaded vertically. If necessary, use a lifting arm, to which the lifting gear
can be vertically attached.
•Ensure the load is lifted vertically!
•Prevent the suspended load from swinging!

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12 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
3.2.2 Attaching the unit
Fig.2: Attaching the unit
•Comply with applicable national safety regulations.
•Use legally specified and approved lifting gear.
•Select the lifting gear based on the prevailing conditions (weather, attachment point,
load, etc.).
•Only attach the lifting gear to the attachment point. Fix in place with a shackle.
•Never feed the lifting gear over or through transport lugs without protection.
•Never feed the lifting gear over sharp edges without protection.
•Use lifting equipment with sufficient bearing capacity.
•The stability of the lifting equipment must be ensured during operation.
•When using lifting equipment, ensure a second person is present to coordinate the pro-
cedure if required (e.g. if the operator’s field of vision is blocked).
•When lifting, make sure that the load limit of the lifting gear is reduced when pulling at an
angle. The safety and efficiency of the lifting gear is best guaranteed when all load-bear-
ing elements are loaded vertically. If necessary, use a lifting arm, to which the lifting gear
can be vertically attached.
•Ensure the load is lifted vertically!
•Prevent the suspended load from swinging!
3.3 Storage
NOTICE
Improper storage can lead to damage to the equipment.
Damage caused by improper storage is not covered by the guarantee or
warranty.
•Requirements at the storage location:
–dry
–clean
–well-ventilated
–free from vibrations
–free from humidity
–free from rapid or extreme changes in temperature
•Store the product somewhere safe against mechanical damage.
•Protect the bearings and couplings from sand, gravel and other foreign objects.
•Lubricate the unit to prevent rust and bearing seizing.
•Manually rotate the drive shaft several times once a week.
Storage for more than three months
Additional precautionary measures:
•All rotating parts must be coated with a suitable protective medium to protect them
from rust.
•If the pump is to be stored for more than a year:
–Seal the suction and pressure flange.
–Grease the shaft end and protect it with a cap.
–Store the pump horizontally.
–Consult the manufacturer.
4 Application/use
4.1 Intended use The glanded pumps from the Wilo-Atmos GIGA-NHT series are intended for use in district
heating systems or industrial applications with overheated water or heat carrier oil.
The Wilo-Atmos GIGA-NHT pumps may be used for:
•Hot-water heating systems
•Cooling and chilled water circulation systems
•District heating loops up to 200°C
•Industrial water cycles up to 200°C
•Industrial heat carrier oil circuit systems up to 350°C
The pumps are only approved for the fluids specified in the “Technical data” section.
4.2 Improper use WARNING!Misuse of the pump can lead to dangerous situations and damage.
•Never use with fluids that have not been approved by the manufacturer.

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 13
•Non-permitted substances in the fluid can destroy the pump. Abrasive solids (e.g. sand)
increase pump wear.
•Highly flammable materials/fluids should always be kept at a safe distance 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 genuine spare parts only.
Typical installation locations are technical rooms within the building with other domestic
installations. No provision has been made for direct installation of the pump in rooms used
for other purposes (residential and work rooms).
Outdoor installation requires a corresponding, special version (motor with anti-condensa-
tion heater).
Intended use also includes compliance with this manual. Any other use is regarded as non-
compliant with the intended use.
5 Product description
5.1 Design The Wilo-Atmos GIGA-NHT pump is a single-stage back pull-out-centrifugal pump with
spiral housing for horizontal installation. Dimensions in accordance with EN733.
Suitable Wilo control devices (e.g. Comfort control system, CC-HVAC) can control the
power of the pumps continuously. This allows optimisation of the pump output for the de-
mands of the installation and particularly economically efficient pump operation.
5.1.1 Hydraulics The pump consists of a radially divided spiral housing and cast-on pump support feet. The
impeller is a closed radial impeller. The pump shaft is mounted in a plain bearing on the im-
peller side and in grease-lubricated radial ball bearings on the motor side.
5.1.2 Motor The drive units used are:
•IEC standard motors in the three-phase current version
NOTICE
Use a heat-resistant mains connecting cable in systems where fluid tem-
peratures exceed 90°C!
5.1.3 Seal The fluid pump is sealed via a mechanical seal in accordance with EN12756.
5.2 Operation with frequency con-
verter
Operation on the frequency converter is permitted. Refer to the documentation from the
motor manufacturer for the relevant requirements and observe its contents.
5.3 Technical data General
Date of manufacture [MFY] See rating plate
Mains connection [U/f] See motor rating plate
Power consumption [P1] See motor rating plate
Rated power [P2] See motor rating plate
Rated speed [n] See rating plate
Max. delivery head [H] See rating plate
Max. volume flow [Q] See rating plate
Permissible fluid temperature [t] -20°C to +350°C (heat carrier oil)
0to +200°C (water)
Permissible ambient temperature
[t]
+40°C
Permissible operating pressure
[Pmax]
25bar
Flanges PN25 in accordance withEN1092-2

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14 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
Permissible fluids •Heating water in accordance with VDI 2035
•Heat carrier oil
•Water-glycol mixture up to 40% vol.
Protection class IP55
Insulation class [Cl.] F
Motor protection See manufacturer’s documentation
Special voltages/frequencies Pumps with motors with different voltages or other
frequencies are available on request
Additional information CH
Approved fluids for heating pumps •Heating water (in accordance with VDI2035/
VdTÜV Tch 1466/CH: in accordance with
SWKIBT102-01)
•No oxygen binding agents, no chemical sealant.
•Ensure that the system is corrosion-proof. In ac-
cordance with VDI2035 (CH: SWKIBT102-01); fix
leaky spots.
Statement of date of manufacture
The date of manufacture is stated in accordance with ISO8601: JJJJWww
•JJJJ = year
•W = abbreviation for week
•ww = calendar week
5.4 Type key Example: Wilo-Atmos GIGA-NHT 040/200-11/2
Atmos Product family
GIGA Series
NHT Design
NHT = norm pump for high-temperature applications
040 Nominal diameter DN of discharge port
200 Nominal diameter of the impeller in mm
11 Rated motor power P2 in kW
2 Number of poles
5.5 Scope of delivery Complete unit
•Atmos GIGA-NHT pump
•Baseplate
•Coupling and coupling guard
•With or without electric motor
•Installation and operating instructions
Pump by itself:
•Atmos GIGA-NHT pump
•Bare shaft pump, without baseplate
•Installation and operating instructions
5.6 Accessories Accessories have to be ordered separately. For a detailed list, consult the catalogue and
spare parts documentation.
5.7 Anticipated noise levels
5.7.1 Pump with three-phase motor,
50Hz without speed control Motor power PN [kW] Measuring surface sound-pressure level Lp, A [dB(A)] 1)
2-pole (2900rpm) 4-pole (1450rpm)
0.37 – 45
0.55 58 46
0.75 61 46
1.1 61 51
1.5 64 51

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 15
Motor power PN [kW] Measuring surface sound-pressure level Lp, A [dB(A)] 1)
2-pole (2900rpm) 4-pole (1450rpm)
2.2 64 55
3 69 55
4 66 58
5.5 64 58
7.5 72 63
9 72 65
11 72 65
15 72 65
18.5 72 70
22 77 70
30 80 71
37 80 72
45 77 72
55 76 66
75 79 71
1) Spatial mean value of sound-pressure levels within a cube-shaped measuring area at a
distance of 1m from the surface of the motor
Table1: Anticipated noise levels for norm pump (50Hz)
5.7.2 Pump with three-phase motor,
60Hz without speed control Motor power PN [kW] Measuring surface sound-pressure level Lp, A [dB(A)] 1)
2-pole (3500rpm) 4-pole (1750rpm)
0.37 – 49
0.55 62 50
0.75 62 53
1.1 64 53
1.5 64 53
2.2 70 56
3 70 58
3.7 73 58
4.5 71 58
5.5 71 60
7.5 74 60
9.2 74 60
11 74 66
15 74 66
18.5 74 66
22 74 66
30 78 68
37 78 68
45 81 69
55 81 70
75 81 75
90 83 75
1) Spatial mean value of sound-pressure levels within a cube-shaped measuring area at a
distance of 1m from the surface of the motor
Table2: Anticipated noise levels for norm pump (60Hz)

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16 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
5.8 Permissible forces and torques on
the pump flanges
Z
Y
X
Y
X
Z
Fig.3: Permissible forces and torques on the
pump flanges–pump made of grey cast iron
EN-GJL-400-15, for temperatures up to
350°C
DN Forces F [N] Torques M [Nm]
FXFYFZΣ Forces F MXMYMZΣ Torques M
Discharge port
32 288 272 336 528 352 240 272 511
40 352 320 400 624 415 288 336 607
50 479 432 528 831 447 320 368 656
65 592 543 671 1055 479 352 383 703
80 719 656 799 1263 511 368 415 751
100 959 863 1071 1678 560 400 464 831
125 1135 1023 1263 1981 671 479 607 975
150 1438 1295 1598 2509 799 560 656 1167
Suction port
50 528 479 432 831 447 320 368 656
65 671 592 543 1055 479 352 383 703
80 799 719 656 1263 511 368 415 751
100 1071 959 863 1678 560 674 464 830
125 1263 1135 1023 1981 671 479 607 975
150 1598 1438 1295 2509 799 560 656 1167
200 2141 1917 1726 3340 1039 735 847 1534
Values in acc. with ISO/DIN5199–class II (2002)–AppendixB, Family no. 1A.
Table3: Permissible forces and torques on the 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.
Fig.4: 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.
6 Installation and electrical con-
nection
6.1 Personnel qualifications •Electrical work: A qualified electrician must carry out the electrical work.
6.2 Operator responsibilities •Observe locally applicable accident prevention and safety regulations of professional
and trade associations.
•Observe all regulations for working with heavy loads and under suspended loads.
•Provide protective equipment and ensure that the protective equipment is worn by per-
sonnel.
•Avoid pressure surges!
Pressure surges can occur in long pressure pipes. These pressure surges can lead to the
destruction of the pump!
•Structural components and foundations must be of sufficient stability in order to allow
the device to be fixed in a secure and functional manner. The operator is responsible for
the provision and suitability of the building/foundation!

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 17
•Check that the available consulting documents (installation plans, design of the operat-
ing space, inflow conditions) are complete and correct.
6.3 Preparing the installation
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 pipe system if required. Dirt can cause the pump to fail.
• Install only after completion of all welding and soldering work and
after the pipe 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
•The pumps (in the standard version) must be protected from the weather and installed in
a frost/dust-free, well-ventilated environment that is not potentially explosive.
•Mount the pump in a readily accessible place. This makes it easier to complete inspec-
tions, maintenance (e.g. mechanical seal change) or replacement in the future.
•A travelling crane or a device for attaching hoisting gear should be installed above the
set-up site of large pumps.
6.4 Setting up the pump by itself
(variantB, Wilo variant key)
When installing a pump by itself, the required coupling guard and baseplate of the pump
manufacturer should be used. In any case, all components must meet the CEregulations.
The coupling guard must be compatible with EN953.
6.4.1 Selecting the motor Select a motor with sufficient power.
Shaft power <4kW 4kW <P2
<10kW
10kW <P2
<40kW
40kW <P2
Limit value P2
for the motor
25% 20% 15% 10%
Table4: Motor/shaft power
Example:
•Duty point water: Q=100m3/h; H=35m
•Efficiency: 78%
•Hydraulic power: 12.5kW
The required limit value for this duty point lies at 12.5kWx1.15=14.3kW. A motor with a
power of 15kW would be the correct choice.
Wilo recommends using a B3motor (IM1001) with base installation, which is compatible
with IEC34-1.
6.4.2 Selecting the coupling •To establish the connection between the pump with bearing bracket and motor, use a
flexible coupling.
•Select the coupling size according to the recommendations of the coupling manufac-
turer.
•Follow the instructions of the coupling manufacturer.
•After installation on the base and connecting the pipes, check the coupling alignment
and correct it if necessary. The procedure is described in the chapter “Coupling align-
ment”.
•After reaching the operating temperature, the coupling alignment must be checked
again.
•Avoid accidental contact during operation. The coupling must be protected in accord-
ance with EN953.

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18 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
6.5 Installing the pump unit on a base
CAUTION
Danger of property and material damage!
A missing foundation or incorrect installation of the unit on the base can
lead to a malfunction of the pump. Incorrect installation is not covered
by the warranty.
• Only have the pump unit installed by qualified personnel.
• A professional from the concrete sector must be hired for all base
work.
6.5.1 Base
Fig.5: Installing the unit on a base
The base must be able to support the unit installed on the baseplate indefinitely. The base
must be level to ensure there is no tension on the baseplate or unit. Wilo recommends using
premium, non-shrink concrete of an adequate thickness for manufacturing. This would pre-
vent oscillations from being transmitted.
The base must be able to accommodate the forces, oscillations and impact that occur.
Guidance values for dimensioning the base:
•Approx. 1.5to 2x heavier than the unit.
•The width and length should each be about 200mm greater than the baseplate.
The baseplate must not be strained or pulled down on the surface of the base. It must be
supported so that the original alignment is not changed.
Prepare drilled holes for the anchor bolts. Position pipe sleeves vertically in the base at the
corresponding points. Diameter of the pipe sleeves: Around 2½x the diameter of the screws.
This allows the screws to be moved in order to achieve their final positions.
Wilo recommends initially pouring the base up to about 25mm below the planned height.
The surface of the concrete base must be well contoured before curing. Remove the pipe
sleeves after the concrete cures.
When the baseplate is poured out, insert steel rods vertically into the base at regular inter-
vals. The required number of steel rods is dependent on the size of the baseplate. The rods
must project into the baseplate by up to 2/3.
6.5.2 Preparing the baseplate for an-
choring
Fig.6: Shims on the base surface
Fig.7: Levelling screws on the base surface
•Thoroughly clean the base surface.
•Place shims (approx. 20–25mm thick) on every screw hole on the base surface.
Alternatively, levelling screws can also be used.
•For a length spacing of the fixation bores ≥800mm, shims should be additionally placed
in the middle of the baseplate.
•Apply the baseplate and level in both directions with additional shims.
•Align the unit when installing on the base using a spirit level (at the shaft/pressure port).
The baseplate must be horizontal; tolerance: 0.5mm per metre.
•Fit anchor bolts in the provided drilled holes.
NOTICE
The anchor bolts must fit in the fastening bores of the base-
plate.
They must meet the relevant standards and be sufficiently long, so that a
firm fit in the base is guaranteed.

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Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10 19
Fig.8: Levelling and aligning the baseplate
Fig.9: Anchor bolt
•Pour in anchor bolts with concrete. After the concrete has set, tighten the anchor bolts
evenly and firmly.
•Align the unit so that the pipes can be connected to the pump stress-free.
6.5.3 Pouring out the baseplate The baseplate can be poured out after fixing. The process of pouring out reduces vibrations
to a minimum.
•Wet the base surface before pouring out the concrete.
•Use a suitable, non-shrink mortar for pouring out.
•Pour the mortar through the openings in the baseplate. Be sure to avoid hollow spaces.
•Plank the base and baseplate.
•After curing, check the anchor bolts for a tight fit.
•Coat the unprotected surfaces of the base to protect from moisture.
6.6 Pipework The pipe connections of the pump are fitted with dust caps so that no foreign objects can
penetrate during transport and installation.
•These caps must be removed before connecting pipes.
r
5 x DN
d s
r ≈ 2,5 · (d - 2s)
Fig.10: Connecting the pump without tension, settling section upstream and downstream
of the pump
CAUTION
Improper pipework/installation can lead to property damage!
Welding beads, cinder and other contaminants can damage the
pump!
• The pipes must be sufficiently dimensioned, taking the pump inlet
pressure into account.
• Connect the pump and pipes using suitable gaskets. Take the pres-
sure, temperature and fluid into account. Check the gaskets for
proper fitting.
• The pipes must not transfer any forces to the pump. Brace the pipes
directly before the pump and connect them without tension.
• Observe the permissible forces and torques on the pump connecting
pieces!
• The expansion of the pipes in the event of a temperature rise is to be
compensated by suitable means.
• Avoid air pockets in piping by means of appropriate installations.

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20 Installation and operating instructions • Wilo-Atmos GIGA-NHT • Ed.01/2023-10
NOTICE
Simplify subsequent work on the unit!
• To ensure the entire unit does not have to be emptied, install a non-
return valve and shut-off devices before and after the pump.
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.
•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.
•Clean, flush and purge the unit before connecting the pipes.
•Remove the covers from the suction and discharge ports.
•Then connect the pipes to the pump connecting pieces.
6.7 Aligning the unit
WARNING
Risk of burns from hot surfaces!
The spiral housing and the discharge cover assume the temperature of
the fluid during operation. This can result in severe burns.
•Wear personal protective equipment: Safety gloves, safety glasses,
safety shoes.
• Depending on the application, insulate the spiral housing.
• Observe local regulations.
CAUTION
Incorrect alignment can result in property damage!
The transport and installation of the pump can affect the alignment. The
motor must be aligned to the pump (not vice versa).
• Check the alignment before the first start.
CAUTION
Changes to the alignment during operation can result in prop-
erty damage.
The pump and motor are usually aligned at ambient temperature.
Thermal expansion at operating temperature can change the alignment,
particularly in the case of very hot fluids.
Adjustment may be required if the pump is required to pump very hot
fluids:
• Allow the pump to run at the actual operating temperature.
• Switch off the pump then immediately check the alignment.
Precondition for reliable, smooth and efficient operation of a pump unit is proper alignment
of the pump and the drive shaft.
Misalignments can be the cause of:
•excessive noise development during pump operation
•vibrations
•premature wear
•excessive coupling wear