EWM microplasma 20 User manual

Operating instructions
EN
Welding machine
microplasma 20
microplasma 50
microplasma 120
099-007010-EW501
07.09.2016
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General instructions
WARNING
Read the operating instructions!
The operating instructions provide an introduction to the safe use of the products.
•Read and observe the operating instructions for all system components, especially the
safety instructions and warning notices!
•Observe the accident prevention regulations and any regional regulations!
•The operating instructions must be kept at the location where the machine is operated.
•Safety and warning labels on the machine indicate any possible risks.
Keep these labels clean and legible at all times.
•The machine has been constructed to state-of-the-art standards in line with any applicable
regulations and industrial standards. Only trained personnel may operate, service and
repair the machine.
•Technical changes due to further development in machine technology may lead to a
differing welding behaviour.
In the event of queries on installation, commissioning, operation or special conditions at the
installation site, or on usage, please contact your sales partner or our customer service
department on [phone].
A list of authorised sales partners can be found at www.ewm-group.com.
Liability relating to the operation of this equipment is restricted solely to the function of the
equipment. No other form of liability, regardless of type, shall be accepted. This exclusion of
liability shall be deemed accepted by the user on commissioning the equipment.
The manufacturer is unable to monitor whether or not these instructions or the conditions and
methods are observed during installation, operation, usage and maintenance of the equipment.
An incorrectly performed installation can result in material damage and injure persons as a
result. For this reason, we do not accept any responsibility or liability for losses, damages or
costs arising from incorrect installation, improper operation or incorrect usage and maintenance
or any actions connected to this in any way.
© EWM AG
Dr. Günter-Henle-Straße 8
56271 Mündersbach
Germany
The copyright to this document remains the property of the manufacturer.
Copying, including extracts, only permitted with written approval.
The content of this document has been prepared and reviewed with all reasonable care. The information
provided is subject to change; errors excepted.

Contents
Safety instructions
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1 Contents
1Contents..................................................................................................................................................3
1.1 Safety instructions..........................................................................................................................5
1.2 Notes on the use of these operating instructions ..........................................................................5
1.2.1 Explanation of icons .......................................................................................................6
1.3 Safety instructions..........................................................................................................................7
1.4 Transport and installation ............................................................................................................11
2Intended use.........................................................................................................................................12
2.1 Documents which also apply.......................................................................................................12
2.1.1 Warranty.......................................................................................................................12
2.1.2 Declaration of Conformity.............................................................................................12
2.1.3 Welding in environments with increased electrical hazards.........................................12
2.1.4 Service documents (spare parts and circuit diagrams)................................................12
2.1.5 Calibration/Validation ...................................................................................................12
3Machine description –quick overview ..............................................................................................13
3.1 Front view ....................................................................................................................................13
3.1.1 microplasma 20, 50......................................................................................................13
3.1.2 microplasma 120..........................................................................................................15
3.2 Rear view.....................................................................................................................................17
3.3 Machine control –Operating elements........................................................................................18
4Design and function.............................................................................................................................19
4.1 Transport and installation ............................................................................................................19
4.1.1 Ambient conditions.......................................................................................................19
4.1.1.1 In operation...................................................................................................19
4.1.1.2 Transport and storage...................................................................................19
4.1.2 Machine cooling............................................................................................................20
4.1.3 Workpiece lead, general...............................................................................................20
4.1.4 Welding torch cooling system.......................................................................................20
4.1.4.1 Connection....................................................................................................20
4.1.5 Notes on the installation of welding current leads........................................................21
4.1.5.1 Stray welding currents...................................................................................22
4.1.6 Mains connection..........................................................................................................23
4.1.6.1 Mains configuration.......................................................................................23
4.1.7 Shielding and plasma gas supply.................................................................................24
4.1.7.1 Pressure regulator connection......................................................................24
4.1.7.2 Shielding gas hose connection.....................................................................25
4.1.7.3 Gas test.........................................................................................................26
4.1.8 Welding torch and workpiece line connection..............................................................27
4.1.8.1 microplasma 20, 50.......................................................................................27
4.1.8.2 microplasma 120...........................................................................................28
4.1.9 Function sequences/operating modes .........................................................................29
4.1.9.1 Currentless Test - Simulation mode..............................................................29
4.1.9.2 Explanation of signs and functions ...............................................................29
4.1.9.3 Non-latched operation without Up- und Downslope .....................................29
4.1.10 Welding task selection..................................................................................................32
4.1.10.1 Pilot arc.........................................................................................................32
4.2 Remote control.............................................................................................................................33
4.2.1 FR21 14POL.................................................................................................................33
4.3 Interfaces for automation.............................................................................................................34
4.3.1 Remote control connection socket, 14-pole.................................................................34
5Maintenance, care and disposal.........................................................................................................35
5.1 General........................................................................................................................................35
5.2 Maintenance work, intervals........................................................................................................35
5.2.1 Daily maintenance tasks ..............................................................................................35
5.2.1.1 Visual inspection...........................................................................................35
5.2.1.2 Functional test...............................................................................................35
5.2.2 Monthly maintenance tasks..........................................................................................36

Contents
Safety instructions
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5.2.2.1 Visual inspection ...........................................................................................36
5.2.2.2 Functional test...............................................................................................36
5.2.3 Annual test (inspection and testing during operation)..................................................36
5.3 Disposing of equipment................................................................................................................36
5.3.1 Manufacturer's declaration to the end user..................................................................36
5.4 Meeting the requirements of RoHS..............................................................................................36
6Rectifying faults....................................................................................................................................37
6.1 Checklist for rectifying faults........................................................................................................37
7Technical data.......................................................................................................................................38
7.1 microplasma 20-120.....................................................................................................................38
8Accessories ..........................................................................................................................................39
8.1 Welding torch cooling system......................................................................................................39
8.2 General accessories ....................................................................................................................39
8.3 Remote controls and accessories................................................................................................39
9Appendix A............................................................................................................................................40
9.1 Overview of EWM branches.........................................................................................................40

Contents
Safety instructions
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1.1 Safety instructions
1.2 Notes on the use of these operating instructions
DANGER
Working or operating procedures which must be closely observed to prevent imminent
serious and even fatal injuries.
•Safety notes include the "DANGER" keyword in the heading with a general warning symbol.
•The hazard is also highlighted using a symbol on the edge of the page.
WARNING
Working or operating procedures which must be closely observed to prevent serious
and even fatal injuries.
•Safety notes include the "WARNING" keyword in the heading with a general warning
symbol.
•The hazard is also highlighted using a symbol in the page margin.
CAUTION
Working or operating procedures which must be closely observed to prevent possible
minor personal injury.
•The safety information includes the "CAUTION" keyword in its heading with a general
warning symbol.
•The risk is explained using a symbol on the edge of the page.
Special technical points which users must observe.
Instructions and lists detailing step-by-step actions for given situations can be recognised via bullet
points, e.g.:
•Insert the welding current lead socket into the relevant socket and lock.

Contents
Notes on the use of these operating instructions
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1.2.1 Explanation of icons
Symbol
Description
Symbol
Description
Indicates technical aspects which the
user must observe.
Activate and release/tap/tip
Switch off machine
Release
Switch on machine
Press and keep pressed
Switch
Wrong
Turn
Correct
Numerical value –adjustable
Menu entry
Signal light lights up in green
Navigating the menu
Signal light flashes green
Exit menu
Signal light lights up in red
Time representation (e.g.: wait
4 s/activate)
Signal light flashes red
Interruption in the menu display (other
setting options possible)
Tool not required/do not use
Tool required/use

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Safety instructions
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1.3 Safety instructions
WARNING
Risk of accidents due to non-compliance with the safety instructions!
Non-compliance with the safety instructions can be fatal!
•Carefully read the safety instructions in this manual!
•Observe the accident prevention regulations and any regional regulations!
•Inform persons in the working area that they must comply with the regulations!
WARNING
Risk of injury from electrical voltage!
Voltages can cause potentially fatal electric shocks and burns on contact. Even low
voltages can cause a shock and lead to accidents.
•Never touch live components such as welding current sockets or stick, tungsten or wire
electrodes!
•Always place torches and electrode holders on an insulated surface!
•Wear the full personal protective equipment (depending on the application)!
•The machine may only be opened by qualified personnel!
Hazard when interconnecting multiple power sources!
If a number of power sources are to be connected in parallel or in series, only a
technical specialist may interconnect the sources as per standard IEC 60974-9:2010:
Installation and use and German Accident Prevention Regulation BVG D1 (formerly VBG
15) or country-specific regulations.
Before commencing arc welding, a test must verify that the equipment cannot exceed
the maximum permitted open circuit voltage.
•Only qualified personnel may connect the machine.
•When taking individual power sources out of operation, all mains and welding current leads
must be safely disconnected from the welding system as a whole. (Hazard due to reverse
polarity voltage!)
•Do not interconnect welding machines with pole reversing switch (PWS series) or machines
for AC welding since a minor error in operation can cause the welding voltages to be
combined, which is not permitted.

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Safety instructions
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WARNING
Risk of injury due to improper clothing!
During arc welding, radiation, heat and voltage are sources of risk that cannot be
avoided. The user has to be equipped with the complete personal protective equipment
at all times. The protective equipment has to include:
•Respiratory protection against hazardous substances and mixtures (fumes and vapours);
otherwise implement suitable measures such as extraction facilities.
•Welding helmet with proper protection against ionizing radiation (IR and UV radiation) and
heat.
•Dry welding clothing (shoes, gloves and body protection) to protect against warm
environments with conditions comparable to ambient temperatures of 100 °C or higher and
arcing and work on live components.
•Hearing protection against harming noise.
WARNING
Risk of injury due to radiation or heat!
Arc radiation results in injury to skin and eyes.
Contact with hot workpieces and sparks results in burns.
•Use welding shield or welding helmet with the appropriate safety level (depending on the
application)!
•Wear dry protective clothing (e.g. welding shield, gloves, etc.) according to the relevant
regulations in the country in question!
•Protect persons not involved in the work against arc beams and the risk of glare using
safety curtains!
WARNING
Explosion risk!
Apparently harmless substances in closed containers may generate excessive pressure
when heated.
•Move containers with inflammable or explosive liquids away from the working area!
•Never heat explosive liquids, dusts or gases by welding or cutting!
Fire hazard!
Due to the high temperatures, sparks, glowing parts and hot slag that occur during
welding, there is a risk of flames.
•Be watchful of potential sources of fire in the working area!
•Do not carry any easily inflammable objects, e.g. matches or lighters.
•Ensure suitable fire extinguishers are available in the working area!
•Thoroughly remove any residue of flammable materials from the workpiece prior to starting
to weld.
•Only further process workpieces after they have cooled down. Do not allow them to contact
any flammable materials!

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CAUTION
Smoke and gases!
Smoke and gases can lead to breathing difficulties and poisoning. In addition, solvent
vapour (chlorinated hydrocarbon) may be converted into poisonous phosgene due to
the ultraviolet radiation of the arc!
•Ensure that there is sufficient fresh air!
•Keep solvent vapour away from the arc beam field!
•Wear suitable breathing apparatus if appropriate!
CAUTION
Noise exposure!
Noise exceeding 70 dBA can cause permanent hearing damage!
•Wear suitable ear protection!
•Persons located within the working area must wear suitable ear protection!
Obligations of the operator!
The respective national directives and laws must be complied with when operating the machine!
•Implementation of national legislation relating to framework directive 89/391/EEC on the
introduction of measures to encourage improvements in the safety and health of workers at
work and associated individual guidelines.
•In particular, directive 89/655/EEC concerning the minimum safety and health requirements for
the use of work equipment by workers at work.
•The regulations applicable to occupational safety and accident prevention in the country
concerned.
•Setting up and operating the machine as per IEC 60974.-9.
•Brief the user on safety-conscious work practices on a regular basis.
•Regularly inspect the machine as per IEC 60974.-4.
The manufacturer's warranty becomes void if non-genuine parts are used!
•Only use system components and options (power sources, welding torches, electrode
holders, remote controls, spare parts and replacement parts, etc.) from our range of products!
•Only insert and lock accessory components into the relevant connection socket when the
machine is switched off.
Requirements for connection to the public mains network
High-performance machines can influence the mains quality by taking current from the mains
network. For some types of machines, connection restrictions or requirements relating to the
maximum possible line impedance or the necessary minimum supply capacity at the interface
with the public network (Point of Common Coupling, PCC) can therefore apply. In this respect,
attention is also drawn to the machines' technical data. In this case, it is the responsibility of the
operator, where necessary in consultation with the mains network operator, to ensure that the
machine can be connected.

Contents
Safety instructions
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CAUTION
Electromagnetic fields!
The power source may cause electrical or electromagnetic fields to be produced which
could affect the correct functioning of electronic equipment such as IT or CNC devices,
telecommunication lines, power cables, signal lines and pacemakers.
•Observe the maintenance instructions > see 5.2 chapter!
•Unwind welding leads completely!
•Shield devices or equipment sensitive to radiation accordingly!
•The correct functioning of pacemakers may be affected (obtain advice from a doctor if
necessary).
According to IEC 60974-10, welding machines are divided into two classes of
electromagnetic compatibility (the EMC class can be found in the Technical
data) > see 7 chapter:
Class A machines are not intended for use in residential areas where the power supply comes
from the low-voltage public mains network. When ensuring the electromagnetic compatibility of
class A machines, difficulties can arise in these areas due to interference not only in the supply
lines but also in the form of radiated interference.
Class B machines fulfil the EMC requirements in industrial as well as residential areas,
including residential areas connected to the low-voltage public mains network.
Setting up and operating
When operating arc welding systems, in some cases, electro-magnetic interference can occur
although all of the welding machines comply with the emission limits specified in the standard.
The user is responsible for any interference caused by welding.
In order to evaluate any possible problems with electromagnetic compatibility in the
surrounding area, the user must consider the following: (see also EN 60974-10 Appendix A)
•Mains, control, signal and telecommunication lines
•Radios and televisions
•Computers and other control systems
•Safety equipment
•The health of neighbouring persons, especially if they have a pacemaker or wear a hearing
aid
•Calibration and measuring equipment
•The immunity to interference of other equipment in the surrounding area
•The time of day at which the welding work must be carried out
Recommendations for reducing interference emission
•Mains connection, e.g. additional mains filter or shielding with a metal tube
•Maintenance of the arc welding system
•Welding leads should be as short as possible and run closely together along the ground
•Potential equalization
•Earthing of the workpiece. In cases where it is not possible to earth the workpiece directly,
it should be connected by means of suitable capacitors.
•Shielding from other equipment in the surrounding area or the entire welding system

Contents
Transport and installation
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1.4 Transport and installation
WARNING
Risk of injury due to improper handling of shielding gas cylinders!
Improper handling and insufficient securing of shielding gas cylinders can cause
serious injuries!
•Observe the instructions from the gas manufacturer and any relevant regulations
concerning the use of compressed air!
•Do not attach any element to the shielding gas cylinder valve!
•Prevent the shielding gas cylinder from heating up.
CAUTION
Risk of accidents due to supply lines!
During transport, attached supply lines (mains leads, control cables, etc.) can cause
risks, e.g. by causing connected machines to tip over and injure persons!
•Disconnect all supply lines before transport!
Risk of tipping!
There is a risk of the machine tipping over and injuring persons or being damaged itself
during movement and set up. Tilt resistance is guaranteed up to an angle of 10°
(according to IEC 60974-1).
•Set up and transport the machine on level, solid ground.
•Secure add-on parts using suitable equipment.
The units are designed for operation in an upright position!
Operation in non-permissible positions can cause equipment damage.
•Only transport and operate in an upright position!
Accessory components and the power source itself can be damaged by incorrect connection!
•Only insert and lock accessory components into the relevant connection socket when the
machine is switched off.
•Comprehensive descriptions can be found in the operating instructions for the relevant
accessory components.
•Accessory components are detected automatically after the power source is switched on.
Protective dust caps protect the connection sockets and therefore the machine against dirt and
damage.
•The protective dust cap must be fitted if there is no accessory component being operated on
that connection.
•The cap must be replaced if faulty or if lost!

Intended use
Documents which also apply
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2 Intended use
WARNING
Hazards due to improper usage!
The machine has been constructed to the state of the art and any regulations and
standards applicable for use in industry and trade. It may only be used for the welding
procedures indicated at the rating plate. Hazards may arise for persons, animals and
material objects if the equipment is not used correctly. No liability is accepted for any
damages arising from improper usage!
•The equipment must only be used in line with its designated purpose and by trained or
expert personnel!
•Do not improperly modify or convert the equipment!
Arc welding machine for microplasma DC welding with HF start (contactless). It may be possible to
expand the range of functions by using accessories (see the documentation in the relevant chapter).
2.1 Documents which also apply
2.1.1 Warranty
For more information refer to the "Warranty registration" brochure supplied and our information
regarding warranty, maintenance and testing at www.ewm-group.com!
2.1.2 Declaration of Conformity
The labelled machine complies with the following EC directives in terms of its design and
construction:
•Low Voltage Directive (LVD)
•Electromagnetic Compatibility Directive (EMC)
•Restriction of Hazardous Substance (RoHS)
In case of unauthorised changes, improper repairs, non-compliance with specified deadlines for "Arc
Welding Equipment –Inspection and Testing during Operation", and/or prohibited modifications which
have not been explicitly authorised by EWM, this declaration shall be voided. An original document of the
specific declaration of conformity is included with every product.
2.1.3 Welding in environments with increased electrical hazards
In compliance with IEC / DIN EN 60974, VDE 0544 the machines can be used in
environments with an increased electrical hazard.
2.1.4 Service documents (spare parts and circuit diagrams)
WARNING
Do not carry out any unauthorised repairs or modifications!
To avoid injury and equipment damage, the unit must only be repaired or modified by
specialist, skilled persons!
The warranty becomes null and void in the event of unauthorised interference.
•Appoint only skilled persons for repair work (trained service personnel)!
Original copies of the circuit diagrams are enclosed with the unit.
Spare parts can be obtained from the relevant authorised dealer.
2.1.5 Calibration/Validation
We hereby confirm that this machine has been tested using calibrated measuring equipment, as
stipulated in IEC/EN 60974, ISO/EN 17662, EN 50504, and complies with the admissible tolerances.
Recommended calibration interval: 12 months

Machine description –quick overview
Front view
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3 Machine description – quick overview
3.1 Front view
3.1.1 microplasma 20, 50
Figure 3-1
Item
Symbol
Description 0
1
Carrying handle
2
Cooling air outlet
3
Main switch, machine on/off
4
Plasma gas connecting nipple (G1/4” right)
Connection to the welding torch or gas metering unit
5
Welding current connection socket, welding torch
6
Machine feet
7
5-pole connection socket, welding torch control lead
8
Coolant return from welding torch
9
Pilot current connection socket
Plasma welding torch nozzle potential
10
Coolant supply to the welding torch
11
Plasma gas flow regulator
Control and display of gas flow volume
12
Shielding gas flow regulator
Control and display of gas flow volume

Machine description –quick overview
Front view
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Item
Symbol
Description 0
13
Connection socket, 14-pole
Remote control connection
14
Connection socket, “+” welding current
Connection for workpiece lead
15
Pilot arc button with signal light
Signal light off: pilot arc off
Signal light on: pilot arc lit
16
Toggle switch for no-power test
Simulation option for the set parameter values without welding
17
Cooling air inlet
18
Three-figure display
Display of the welding voltage
19
Machine control > see 3.3 chapter
20
Shielding gas connecting nipple (G1/4” left)
Connection to the welding torch or gas metering unit
21
Gas test push-button > see 4.1.7.3 chapter
22
Three-figure display
Display of the welding current

Machine description –quick overview
Front view
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3.1.2 microplasma 120
Figure 3-2
Item
Symbol
Description 0
1
Carrying handle
2
Cooling air outlet
3
Main switch, machine on/off
4
Plasma gas connection (plug nipple type 20)
Connection to the welding torch or gas metering unit
5
Welding current connection socket, welding torch
6
Machine feet
7
5-pole connection socket, welding torch control lead
8
Coolant return from welding torch
9
Pilot current connection socket
Plasma welding torch nozzle potential
10
Coolant supply to the welding torch
11
Plasma gas flow regulator
Control and display of gas flow volume
12
Shielding gas flow regulator
Control and display of gas flow volume
13
Connection socket, 14-pole
Remote control connection
14
Connection socket, “+” welding current
Connection for workpiece lead

Machine description –quick overview
Front view
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Item
Symbol
Description 0
15
Pilot arc button with signal light
Signal light off: pilot arc off
Signal light on: pilot arc lit
16
Toggle switch for no-power test
Simulation option for the set parameter values without welding
17
Cooling air inlet
18
Three-figure display
Display of the welding voltage
19
Machine control > see 3.3 chapter
20
Shielding gas connection (coupling type 20)
Connection to the welding torch or gas metering unit
21
Gas test push-button > see 4.1.7.3 chapter
22
Three-figure display
Display of the welding current

Machine description –quick overview
Rear view
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3.2 Rear view
Figure 3-3
Item
Symbol
Description 0
1
Ignition type changeover switch
= HF ignition
= Liftarc (contact ignition)
2
G1/4" connecting nipple, shielding gas connection
Connection to the pressure reducer
3
G1/4" connecting nipple, plasma gas connection
Connection to the pressure reducer
4
Quick connect coupling (red)
coolant return
5
Quick connect coupling (blue)
coolant supply
6
Mains connection cable > see 4.1.6 chapter

Machine description –quick overview
Machine control –Operating elements
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3.3 Machine control –Operating elements
Figure 3-4
Item
Symbol
Description 0
1
Operating mode rotary switch
------ not available
-- Operating mode non-latched
------ Operating mode non-latched with Up- and Downslope
---- Operating mode latched with Up- und Downslope
2
Excess temperature signal light / Welding torch cooling failure
For error messages > see 6 chapter
3
Ignition current
Setting range 0% to 100% depending on the main current.
4
Rotary dial Upslope time
Setting range 0 s to 25 s
5
Torch trigger signal light
Illuminates immediately torch trigger 1 is activated.
6
Welding current setting rotary dial
Infinite setting of the welding current across the whole power range.
7
Rotary dial Downslope time
Setting range 0 s to 25 s
8
Rotary dial Secondary current
Setting range 1% to 100% depending on the main current.
9
Gas post-flow time dial
Setting range 0 s to 20 s

Design and function
Transport and installation
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4 Design and function
4.1 Transport and installation
WARNING
Risk of injury from electric shock!
Contact with live parts, e.g. welding current sockets, is potentially fatal!
•Follow safety instructions on the opening pages of the operating instructions.
•Commissioning may only be carried out by persons who have the relevant expertise of
working with arc welding machines!
•Connection and welding leads (e.g. electrode holder, welding torch, workpiece lead,
interfaces) may only be connected when the machine is switched off!
Risk of accident due to improper transport of machines that must not be lifted!
Do not lift or suspend the machine! The machine can drop and cause injuries! The
handles, straps or brackets are suitable for transport by hand only!
•The machine must not be suspended or lifted using a crane.
Read and observe the documentation to all system and accessory components!
A connected and ready-to-use welding torch cooling unit is required for the operation of this
plasma welding machine!
4.1.1 Ambient conditions
T he machine must not be operated in the open air and must only be set up and operated on a
suitable, stable and level base!
•The operator must ensure that the ground is non-slip and level, and provide sufficient lighting
for the place of work.
•Safe operation of the machine must be guaranteed at all times.
Unusually high quantities of dust, acid, corrosive gases or substances may damage the
equipment.
•Avoid high volumes of smoke, vapour, oil vapour and grinding dust!
•Avoid ambient air containing salt (sea air)!
4.1.1.1 In operation
Temperature range of the ambient air:
•-25 °C to +40 °C
Relative air humidity:
•Up to 50% at 40 °C
•Up to 90% at 20 °C
4.1.1.2 Transport and storage
Storage in an enclosed space, temperature range of the ambient air:
•-30 °C to +70 °C
Relative air humidity
•Up to 90% at 20 °C

Design and function
Transport and installation
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4.1.2 Machine cooling
Insufficient ventilation results in a reduction in performance and equipment damage.
•Observe the ambient conditions!
•Keep the cooling air inlet and outlet clear!
•Observe the minimum distance of 0.5 m from obstacles!
4.1.3 Workpiece lead, general
CAUTION
Risk of burning due to incorrect welding current connection!
If the welding current plugs (machine connections) are not locked or if the workpiece
connection is contaminated (paint, corrosion), these connections and leads can heat up
and cause burns when touched!
•Check welding current connections on a daily basis and lock by turning to the right when
necessary.
•Clean workpiece connection thoroughly and secure properly. Do not use structural parts of
the workpiece as welding current return lead!
4.1.4 Welding torch cooling system
4.1.4.1 Connection
Figure 4-1
Item
Symbol
Description 0
1
Welding torch cooling unit
2
Coolant return from the welding torch cooling unit
3
Coolant forward flow to the welding torch cooling unit
•Lock connecting nipples of the cooling water tubes into the corresponding quick connect couplings:
Return line red to quick connect coupling, red (coolant return) and
supply line blue to quick connect coupling, blue (coolant supply).