Buhler ELK Series Owner's manual

Fluidcontrol
Installation and Operation Instructions
Original instructions
Oil/air cooler
ELK
BE350034
08/2022
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
E-Mail: [email protected]
Internet: www.buehler-technologies.com

Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
Internet: www.buehler-technologies.com
E-Mail: [email protected]
Read this instruction carefully prior to installation and/or use. Pay at-
tention particularly to all advises and safety instructions to prevent in-
juries. Bühler Technologies can not be held responsible for misusing
the product or unreliable function due to unauthorised modifications.
All rights reserved. Bühler Technologies GmbH 2022
Document information
Document No..........................................................BE350034
Version........................................................................ 08/2022

ELK
Contents
1 Introduction.....................................................................................................................................................................................................................2
1.1 Intended use .........................................................................................................................................................................................................2
1.2 Model key...............................................................................................................................................................................................................2
1.3 Scope of delivery ..................................................................................................................................................................................................2
2 Safety instructions ......................................................................................................................................................................................................... 3
2.1 Important advice .................................................................................................................................................................................................3
2.2 General hazard warnings .................................................................................................................................................................................4
3 Transport and storage .................................................................................................................................................................................................. 5
4 Installation and connection ........................................................................................................................................................................................6
4.1 Requirements to the installation site............................................................................................................................................................6
4.2 Installing the unit................................................................................................................................................................................................6
4.2.1 Installing swivel nuts in the fitting body ......................................................................................................................................6
4.3 Hydraulic connection ......................................................................................................................................................................................... 7
4.4 Electrical connections......................................................................................................................................................................................... 7
4.4.1 Electrical connection temperature switch TSA (accessory)......................................................................................................8
5 Operation and control ..................................................................................................................................................................................................9
5.1 Before starting......................................................................................................................................................................................................9
5.2 During starting ....................................................................................................................................................................................................9
6 Maintenance..................................................................................................................................................................................................................10
6.1 Cleaning and disassembly of the cooler matrix........................................................................................................................................11
6.2 Cleaning the cooler matrix inside .................................................................................................................................................................11
6.3 Cleaning the fan case........................................................................................................................................................................................11
6.4 Replacing fan parts............................................................................................................................................................................................11
7 Service and repair......................................................................................................................................................................................................... 12
7.1 Troubleshooting ................................................................................................................................................................................................ 12
8 Disposal ........................................................................................................................................................................................................................... 13
9 Appendices ..................................................................................................................................................................................................................... 14
9.1 Technical data .................................................................................................................................................................................................... 14
9.1.1 Basic data.............................................................................................................................................................................................. 14
9.1.2 Power and pressure loss graphs .....................................................................................................................................................15
9.2 Dimensions ......................................................................................................................................................................................................... 16
9.3 Functional diagram ..........................................................................................................................................................................................16
9.4 Installation torques and clamping range for cable fitting ....................................................................................................................17
9.5 Screw torques ......................................................................................................................................................................................................17
9.6 Hose torques ........................................................................................................................................................................................................17
9.7 Calculations..........................................................................................................................................................................................................17
9.7.1 Calculating viscosity...........................................................................................................................................................................17
9.7.2 Table of operational viscosity for VG oil...................................................................................................................................... 18
9.7.3 Calculating the pressure loss.......................................................................................................................................................... 18
9.8 Pressure loss in straight pipes....................................................................................................................................................................... 19
10 Attached documents .................................................................................................................................................................................................. 20
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1 Introduction
1.1 Intended use
ELK oil/air coolers are used to cool oils in hydraulic and lubrication circuits. Their scope is indicated in the specifications. Any
other applications require the prior approval of Bühler Technologies GmbH.
1.2 Model key
To also have a thermal contact, the specification will be added to the type designation:
Temperature switch T50, T60
T70, T80
Temperature in °C, specification see
separate data sheet
ELK 300-4-50/60Hz-xxx
Number of motor contacts
Frame size
Motor frequency
ELK 300-4-50/60Hz-T50
(on the ELK 600, the 50 and 60 Hz versions are different, see table "Basic data")
1.3 Scope of delivery
– 1 x oil/air cooler
– Product documentation
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2 Safety instructions
2.1 Important advice
Operation of the device is only permitted if:
– the product is used under the conditions described in the installation- and operation instruction, the intended application
according to the type plate and the intended use. In case of unauthorized modifications done by the user Bühler Technolo-
gies GmbH can not be held responsible for any damage,
– when complying with the specifications and markings on the nameplates.
– the performance limits given in the datasheets and in the installation- and operation instruction are obeyed,
– monitoring devices and safety devices are installed properly,
– service and repair is carried out by Bühler Technologies GmbH,
– only original spare parts are used.
This manual is part of the equipment. The manufacturer keeps the right to modify specifications without advanced notice. Keep
this manual for later use.
Signal words for warnings
DANGER
Signal word for an imminent danger with high risk, resulting in severe injuries or death if not avoided.
WARNING
Signal word for a hazardous situation with medium risk, possibly resulting in severe injuries or death if not
avoided.
CAUTION
Signal word for a hazardous situation with low risk, resulting in damaged to the device or the property or
minor or medium injuries if not avoided.
NOTICE
Signal word for important information to the product.
Warning signs
In this manual, the following warning signs are used:
Warning against hazardous situations Warning against high pressure
Warning against electrical voltage Warning against potentially explosive atmospheres
Warning against hot surface General notice
Warning against environmental hazard Disconnect from mains
Warning against rotating parts Wear protection gloves
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2.2 General hazard warnings
The equipment must be installed by a professional familiar with the safety requirements and risks.
Be sure to observe the safety regulations and generally applicable rules of technology relevant for the installation site. Prevent
malfunctions and avoid personal injuries and property damage.
The operator of the system must ensure:
– Safety notices and operating instructions are available and observed,
– The respective national accident prevention regulations are observed,
– The permissible data and operational conditions are maintained,
– Safety guards are used and mandatory maintenance is performed,
– Legal regulations are observed during disposal,
– compliance with national installation regulations.
– Nearby equipment is EMC protected, e.g. through shielding.
– The current and voltage supply for the aggregate has a (mains) separator with adequate switching capacity. National re-
quirements must be observed.
Maintenance, Repair
Please note during maintenance and repairs:
– Repairs to the unit must be performed by Bühler authorised personnel.
– Only perform conversion-, maintenance or installation work described in these operating and installation instructions.
– Always use genuine spare parts.
– Do not install damaged or defective spare part. If necessary, visually inspect prior to installation to determine any obvious
damage to the spare parts.
Always observe the applicable safety and operating regulations in the respective country of use when performing any type of
maintenance.
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
CAUTION Hot surface
Burning hazard
Let the device cool down before maintaining.
CAUTION High pressure
Hazard of injury due to flung off parts or oil, environmental hazard due to oil.
a) Before starting any maintenance or repair to the oil circuit, make sure that the device
is depressurized. This applies to the threaded plugs as well.
b) Avoid environmental pollution (oil spills) during cleaning or maintenance of the oil
circuit.
c) Use drip pans.
DANGER Potentially explosive atmosphere
Explosion hazard if used in hazardous areas.
The device is not suitable for operation in hazardous areas with potentially explosive at-
mospheres.
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3 Transport and storage
Only transport the product inside the original packaging or a suitable alternative. Ensure secure fastening and mooring.
Air coolers have M8 or M10 eye bolts at the top of the cooler housing for transport. Please note, due to the variety of versions the
mounting bracket is not located at the centre of gravity and the cooler may swing when hoisted.
Only use the motor transport eyes to hoist the motor without add-ons.
Do not use the eye bolts according to DIN 580 in ambient temperatures below -20°C. The eye bolts could fracture in these tem-
peratures, injuring personnel and/or damage the system.
Do not strain the eye bolts more than 45° in the thread direction.
When not in use, the equipment must be protected from moisture and heat. It must be stored in a covered, dry, dust-free room
at room temperature.
WARNING Crushing hazard
Crushing hazard during equipment transport and set-up.
Use the correct hoisting gear to prevent injuries during hoisting.
Be sure the hoisting gear is free from defects and approved for the weight of the device.
Ensure secure fastening and mooring when transporting.
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4 Installation and connection
4.1 Requirements to the installation site
Aggregate
The aggregate must be set up to allow for unobstructed air flow and adequate room for maintenance/repairs. When installed
outdoors, be sure to consider the motor protection rating (standard: IP 55) and ensure adequate protection from the weather.
Air cooler
The cooler must be located in such a way that the air flowing through the matrix has free flow on entry and exit. The distance
between air intake or air outlet to the nearest surrounding obstacle should be at minimum half the height of the matrix. Free
air flow must be provided.If the cooler is to be sited near to working personnel, the effect of hot draught and noise emissions
must be taken into account.
If the cooler is installed in closed space, ensure sufficient air circulation. Avoid back flow of warmed air. If necessary, the room
must be vented.
Due to lower temperatures with respect to closed rooms, the cooling capacity outside raises, but on the other hand higher start
up pressure may result due to higher oil viscosity. In this case, consider a bypass valve and / or a heating.
The rotating fan might lead to static charging. Therefore sensitive equipment like electronics should be kept away from the
device.
4.2 Installing the unit
The units are screwed in place at the attachment points using screws. Be sure the support structure is sized adequately. To pro-
tect the system from damage, the connections must be stress free. We recommend using flexible hoses. Be sure the hose is
stable against negative pressure, e.g. steel wire reinforced. Avoid possible leaks in the circuit to prevent environmental dam-
ages. If necessary, use an oil pan. Protect the aggregate from mechanical impact.
4.2.1 Installing swivel nuts in the fitting body
Proceed as follows:
– Carefully slide the preinstalled pipe end into the 24° cone on the fitting body.
– Tighten the swivel nut until a considerable increase in force can be felt (fixed point).
– Use a suitable spanner to tighten the swivel nut a 1/12 turn more (30°) beyond the fixed point. A marker line on the swivel
nut and the fitting body facilitates observing the correct tightening angle.
Tube
A.D.
Thread Torque (Nm) for straight
screwed plug
Torque (Nm) sealing plug
6 G 1/8" 18 13
8 G 1/4" 35 30
10 G 1/4" 35 30
12 G 3/8" 70 60
15 G 1/2" 90 80
18 G 1/2" 90 80
22 G 3/4" 180 140
28 G 1" 310 200
35 G 1 1/4" 450 400
42 G 1 1/2" 540 450
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4.3 Hydraulic connection
Carry out the hydraulic connection as described in the attached data. Connect the lines stress and vibration free, so typically us-
ing hoses.
Be sure to use suitable lines (with regard to pressure, fluid resistance, environmental influences, fire) when connecting to the
hydraulic-, lubrication circuit. Tighten the hose lines with a suitable torque (see appendix).
Contaminated fluids impact the life of the cooling system, we therefore recommend a purity class of minimum 3/19/13 per
ISO4406.
If your hydraulic system is equipped with control or shut-off valves, we recommend protecting the cooling system with a pres-
sure relief valve. No pressure relief valves are factory installed in the cooler.
When installing an air cooler in return lines, sudden changes to the flow rate can potentially cause significant pressure peaks
which even safety relief valves cannot dampen. The limits for the static pressure must not exceed max. 21bar, or 15bar for dy-
namic pressure peaks. Otherwise an off-line cooler must be used.
4.4 Electrical connections
CAUTION Electrical voltage
Wrong mains voltage may damage the device.
Installation of the device shall be performed by trained staff only. Regard the voltage
given on the type plate. Make sure that the cables have sufficient strain relief.
Fusing
Fusing has to be done due to local standards!
Polarity
Take care of the directional rotation of the motor. The fan rotates counter clockwise
when regarded form the motor’s side!
Watch the direction arrow on the sticker.
The direction of rotation can be changed by reversing any two phases.
Use the applicable local regulations to determine the safety values and the cross-sections of connection leads. The motor and, if
equipped, starting devices must be connected to protective earth.
Lead fuses protect the cables in case of a short circuit, but are not sufficient to protect the motor coils from burning due to over-
load. Therefore, install an adequate motor circuit breaker with high precision range of adjustment for thermal protection to pro-
tect the motor against overload and operation with two phases
Adjust the motor circuit breaker according to the nominal value specified on the type plate of the motor. Operation outside the
specified mains voltage and frequency range limits is prohibited.
Take appropriate measures to protect energised parts from being touched by persons and/or interference from foreign objects.
The operator of the equipment is responsible for ensuring lightning protection.
Connect the protective earth of the motor to the protective earth on site. Protective earth per DINVDE0100 must be connected
to the marked earth lead terminal.
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4.4.1 Electrical connection temperature switch TSA (accessory)
The temperature switch TSA is installed in a cooling circuit with an oil/air cooler ELK as a typical application. Through reaching
the switching temperature the fan-motor is switched-on and the oil will be cooled. After falling under the hysteresis the motor
shuts off.
If the cooling matrix has an optional temperature contact type TSA, the maximum values (see below) must not be exceeded. If
connecting it to a relay, a free wheel circuit has to be added. Carry out the connection according to the following specifications
(numbering inside the connector):
Terminal 1 – 2 Contacts
Terminal 3 Not used
Terminal PE Protective earth
Temperature switch TSA T50
T60
T70
switching temperature 50 °C
60 °C
70 °C
max. voltage 230 V AC/D
max. switching current 2 A, contact load max. 100 VA
switching function NC
Hysteresis approx. 10 °C
protection class IP 65
Example wiring with temperature switch
F1 Fuse K1 Relay
F2 Fuse K2 Circuit breaker
F3 Fuse S1 Protecting device
H1 Mains switch S2 Protecting device
Relay, circuit breaker and protecting devices are not part of the delivery.
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5 Operation and control
WARNING Danger due to rotating fan
Injuries to the hand may occur. Do not reach into the safety guard!
NOTICE
The device must not be operated beyond its specifications.
NOTICE
Abrupt flow variation can lead to pressure peaks that may damage the cooler matrix.
Make sure that the specifications are not exceeded in this case!
5.1 Before starting
– Check that all parts are free of damage, especially the cooling element and fan guard. Do not put a damaged device into op-
eration.
– Check if the two warning labels (rotating parts) on the cooler’s housing are fitted.
– Check the correct connections of oil and power circuits according to chapter „Installation and connection“.
– Make sure that all valves or other parts in the cooling circuit, which have to be opened, are opened.
5.2 During starting
First, check that the motor is proper electrically connected and the fan rotates counter clockwise when looking from the motor’s
side.
CAUTION Hot surface
Burning hazard
Let the device cool down before maintaining.
CAUTION High pressure
Hazard of injury due to flung off parts or oil, environmental hazard due to oil.
a) Before starting any maintenance or repair to the oil circuit, make sure that the device
is depressurized. This applies to the threaded plugs as well.
b) Avoid environmental pollution (oil spills) during cleaning or maintenance of the oil
circuit.
c) Use drip pans.
Noise level
The coolers, which are supplied with an additional circulation pump, have a low noise. If the noise level increases significantly
over the listed value, this could be caused through improper installation of the cooler, specially of the suction line. The technical
consultants from Bühler Technologies GmbH will be happy to assist you.
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6 Maintenance
During maintenance, remember:
– The equipment must be maintained by a professional familiar with the safety requirements and risks.
– Only perform maintenance work described in these operating and installation instructions.
– Observe the respective safety regulations and operating specifications when performing any type of maintenance.
– Always use genuine spare parts.
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
CAUTION Hot surface
Burning hazard
Let the device cool down before maintaining.
CAUTION High pressure
Hazard of injury due to flung off parts or oil, environmental hazard due to oil.
a) Before starting any maintenance or repair to the oil circuit, make sure that the device
is depressurized. This applies to the threaded plugs as well.
b) Avoid environmental pollution (oil spills) during cleaning or maintenance of the oil
circuit.
c) Use drip pans.
Under normal operating conditions the aggregates are maintenance free. Preventive maintenance must therefore be routinely
carried out by the operating company.
When doing so, please pay attention to:
– Tight screw fittings,
– Tightness,
– Damage to the aggregate (replace damaged parts),
– Abnormal (unusual) noise and vibration,
– Cooler matrix cleanliness. Dirt on the cooler matrix reduces the cooling capacity,
– Check warning labels for legibility and damage.
Electrical connections must be checked annually by a licensed electrician.
The external parts the motors, particularly the cooling ribs and cooling ducts as clean as possible to prevent compromising heat
release.
Please note the specified protection against dust and moisture. Pressure cleaning is only permitted if the motor has the respect-
ive protection rating.
The motors feature ball bearings sealed on both sides. The grease filling is designed to last for the life of the unit. Greasing is not
necessary.
The motor mounts may only be replaced by Bühler Technologies GmbH or a qualified specialist company.
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6.1 Cleaning and disassembly of the cooler matrix
Due to the design of the cooling fins, the cooler has low susceptibility to dust and dirt. Normally, it is sufficient to clean the front
surface with a brush. However, particularly if the air has a high dust and/or oil mist content, the cooling matrices may require
regular cleaning.
– First allow the cooling matrix to cool down. Disconnect the motor from the mains and secure it against accidental restarting.
– Depressurize the system and disconnect the piping to the cooling matrix. Place an oil drip pan below the cooling matrix to
collect leaking oil.
– Close all connections with plugs to avoid more oil leaking from the matrix.
– Protect the cooling matrix from falling down.
– First remove the fan guard with motor and fan wheel by unscrewing the 4 fastening screws. After removing the four con-
necting bolts to the box, the cooling element can be loosened and removed.
– Move the cooling matrix to the cleaning area. Be sure not to crush the fins during transport and cleaning.
– The fins can easily be cleaned with compressed air. Carefully direct the stream parallel to the fins.
– Residue can be carefully removed with a pressure washer and degreaser. Rinse with clear water after cleaning.
– After cleaning, remount the cooling matrix in reverse order.
– Ensure the splices are seated correctly.
6.2 Cleaning the cooler matrix inside
In the event of deposits in the cooling matrix due to inadequate filtration, you may try to remove these as follows after cleaning
the outside:
– Remove the cooler matrix as described in “Cooler matrix cleaning and disassembly”.
– Add degreaser and close all connections of the cooler matrix with plugs.
– After allowing the degreaser to sit for a while, drain and flush the cooler matrix with clean fluid. Dispose of the degreaser
and flushing oil as required by law.
– After cleaning, remount the cooler matrix in reverse order.
6.3 Cleaning the fan case
Due to the design, dust and dirt will not deposit in a large amount inside the fan case. Nevertheless, any deposits of dirt should
be blown out each time the cooler is cleaned.
6.4 Replacing fan parts
– Disconnect the motor from power and secure against restarting.
– Now disconnect the connecting cable.
– Protect the fan from falling.
– Now loosen the four connecting screws to the box at the tips of the grate.
– You can now carefully remove the fan out the back.
– Insert the new fan in the reverse order. When replacing the fan wheel, the retaining screw of the fan must be installed in the
motor shaft using glue to secure the screws.
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7 Service and repair
This chapter contains information on troubleshooting and correction should an error occur during operation.
Repairs to the unit must be performed by Bühler authorised personnel.
Please contact our Service Department with any questions:
Tel.: [phone] or your agent
For further information about our services and customised maintenance visit http://www.buehler-technologies.com/service.
If the equipment is not functioning properly after correcting any malfunctions and switching on the power, it must be inspected
by the manufacturer. Please send the equipment inside suitable packaging to:
Bühler Technologies GmbH
- Reparatur/Service -
Harkortstraße 29
40880 Ratingen
Germany
Please also attach the completed and signed RMA decontamination statement to the packaging. We will otherwise be unable to
process your repair order.
You will find the form in the appendix of these instructions, or simply request it by e-mail:
[email protected].
7.1 Troubleshooting
Problem/malfunction Possible cause Action
Insufficient cooling capacity – Air temperature higher than specified – Select a larger cooler model
– Motor direction of rotation incorrect – Correct connection, see Electrical connections [>
page7]
– Motor doesn’t start – Correct connection, see Electrical connections [>
page7]
– Air flow too low – Correct connection, see Electrical connections [>
page7]
– Fins clogged – Clean per chapter Maintenance [> page10]
– Obstructions nearby – Maintain the minimum clearance
– Oil flow too low – Increase oil flow
– Oil channel clogged – Clean per chapter Cleaning the cooler matrix in-
side [> page11]
– Oil circuit blocked – Open valves and cocks
Tab.1: Troubleshooting
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8 Disposal
Dispose of the parts in such a way that does not present a danger to other people’s heath or to the environment. Observe the
legal requirements in the country of use for the disposal of electrical components and oils and coolants.
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9 Appendices
9.1 Technical data
Technical Data
Materials/surface protection
Cooling matrix:
Fan hub:
Fan blades:
Ventilation box, guard and motor brackets:
Screw connections:
Hydraulic screw fittings:
Aluminium, powder-coated
Aluminium, bare
Glass-reinforced polypropylene (PPG), bare
Steel, galvanised, powder-coated
V2A stainless steel
Steel, zinc-nickel coated
Colour: Steel parts: RAL 9005, jet black
Motor: RAL9005 jet black or RAL7031 blue grey
(special colours on request)
Surface protection: Steel parts: ISO 12944, C3 medium
Motor: ISO 12944, C2 medium
(higher on request)
Operating fluids: Mineral oils according to DIN 51524
Gear lubricant according to DIN 51517-3
Oil/water emulsions HFA and HFB according to CETOP RP 77 H
Water glycol HFC according to CETOP RF 77 H
Phosphoric ester HFD-R according to CETOP RP 77 H
permissible operating pressure
static
dynamic
max. 21 bar
15 bar (at 2 M load cycle, 3Hz)
Operating oil temperature: max. 80 °C (higher upon request)
Ambient temperature: -20 °C to +40 °C (different ambient temperatures on request)
max. set-up altitude: 1000 m (higher on request)
Electric motors (others available upon request)
Voltage/frequency: 230/400 V 50 Hz
265/460V 60Hz
(special voltages/motor approvals on request)
Thermal stability: Class of insulation F,
utilisation per class B
(higher on request)
IP rating: IP55 (higher on request)
The motors comply with standards
IEC 60034, IEC 60072, IEC 60085, EU 2019/1781
9.1.1 Basic data
Item no. Cooler model Power output
Number of contacts
Rated current
Weight
(kg)
Volume
(L)
Sound pressure
level
db(A)*
400 V 50 Hz 460V 60Hz 50/60 Hz 50/60 Hz 50 Hz 60 Hz
35ELK10040 ELK100 -50/60Hz 0.09 kW/4-poles/0.31 A 0.1 kW/4-poles/0.3 A 17 1.7 66 70
35ELK20040 ELK200 -50/60Hz 0.12 kW/4-poles/0.37 A 0.14 kW/4-poles/0.37 A 21 1.7 67 71
35ELK30040 ELK300 -50/60Hz 0.25 kW/4-poles/0.66 A 0.29 kW/4-poles/0.67 A 28 2.2 70 74
35ELK40040 ELK400 -50/60Hz 0.37 kW/4-poles/0.92 A 0.43 kW/4-poles/0.91 A 32 3.2 73 77
35ELK50040 ELK500 -50/60Hz 0.75 kW/4-poles/1.75 A 0.86 kW/4-poles/1.68 A 44 3.7 77 81
35ELK60041 ELK600 -50Hz 1.1 kW/4-poles/2.5 A - 54 4.3 80 -
35ELK60042 ELK600 -60Hz - 1.3 kW/4-poles/2.5 A - 83
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9.1.2 Power and pressure loss graphs
Performance curves
Tolerance: ± 5%
Fig.1: Specific cooling capacity
Pressure loss curves at medium viscosity of 30 cSt
Tolerance: ± 5%
Fig.2: Pressure loss
Note: When installed outdoors or using higher viscosities, an additional bypass valve may be required. These are not available
for the ELK series. In this case, use our BLK series or an external bypass valve.
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9.2 Dimensions
Type A B C D E F G H
ELK100 360 290 203 25 390 151 170 2x G3/4"
ELK200 425 355 203 25 402 144 202 2x G3/4"
ELK300 510 430 203 30 458 184 240 2x G1"
ELK400 570 491 203 30 476 202 270 2x G1"
ELK500 630 551 356 30 526 213 300 2x G1"
ELK600 690 611 356 30 606 245 330 2x G1"
9.3 Functional diagram
Standard ELK version
Direction of flow left to right or vice versa.
With temperature switch attached
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9.4 Installation torques and clamping range for cable fitting
Size
Strain relief clamping
range (mm)
Installation torque (Nm)
M12x1,5 3-6 1,5
M16x1,5 5-9,5 2,5
M20x1,5 8-13 3,5
M25x1,5 11-17 5
M32x1,5 15-21 5
M40x1,5 19-28 7,5
M50x1,5 27-35 7,5
M63x1,5 32-42 13
9.5 Screw torques
Thread Torque (Nm)
M5 4
M6 8
M8 15
M10 30
M12 51
9.6 Hose torques
Connections/mounts Torque (Nm)
Hose connections DN20 180
Hose connections DN25 250
Hose connections DN32 350
9.7 Calculations
9.7.1 Calculating viscosity
Valid for VG-oil between 10 - 100 °C at an exactness from ± 5 %.
Definitions Example: oil VG 46
V40 oil viscosity at 40 °C in cst V40 46 cst
T temperature in °C T 25 °C
ʋviscosity in cst
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9.7.2 Table of operational viscosity for VG oil
10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C
VG 46 264,45 131,96 73,58 46,00 29,13 20,04 14,43 10,78 8,32
VG 68 444,77 210,85 112,61 68,00 41,63 27,86 19,58 14,32 10,84
VG 220 2.120,17 861,60 404,31 220,00 121,71 74,99 49,00 33,61 24,01
VG 320 3.489,92 1.350,22 607,96 320,00 171,40 102,85 65,66 44,12 30,94
Viscosity given in cst (mm2/s)
9.7.3 Calculating the pressure loss
Valid for smooth straight piping per meter at laminar current.
Definitions Example: oil VG 46
ʋViscosity in cst ʋ97,35 cst
ρspec. gravity in kg/dm3ρ0,8817 kg/dm³
DN tube diameter in mm DN 20 mm
V flow in m/s V 3,18 m/s (60 l/min for tube DN 20)
PV pressure loss in bar
NOTICE
Pressure loss increases significantly for bends and fittings.
It might be necessary in some cases to determine the final shape of the suction line on
site under specific conditions.
Please do not hesitate to contact us for help to calculate the pressure loss of the suction line for you specific application.
NOTICE
To avoid damage of the cooling system, make sure that the maximum pump pressure is
not exceeded. High pressure may occur if the system is shut off or throttled at the pres-
sure side.
18 Bühler Technologies GmbH BE350034 ◦ 08/2022