Aquila TRIVENTEK BL25 MINI User guide

AquilaTriventekA/S·Industrivej9·DK-5580NørreAaby·Tel.[phone]·[e-mail]·www.aquila-triventek.com
ORIGINAL
Instruction manual for
BL25 MINI Dry Ice Blaster
By Aquila Triventek
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Aquila Triventek A/S · Industrivej 9· DK-5580 Nørre Aaby · Tel.[phone]· [e-mail] · www.aquila-triventek.com
Introduction............................................................................................................................3
Safety ....................................................................................................................................4
Safety data for Triblast-BL25 .................................................................................................6
Assembly of the equipment....................................................................................................8
Quality..................................................................................................................................10
Operating the equipment......................................................................................................11
Maintenance ........................................................................................................................14
Cleaning the equipment.......................................................................................................17
Storage ................................................................................................................................17
Recommended spare parts list ............................................................................................17
Troubleshooting...................................................................................................................18
Technical data......................................................................................................................20
Electrical chart for BL25.......................................................................................................21
Safety PartsIdentification.....................................................................................................22
EC Declaration ofConformity ...............................................................................................26
Warranty ..............................................................................................................................27
Delivery report......................................................................................................................28
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Introduction
WearepleasedthatyouhavechosenthedryiceblastermodelBL25 MINIbyAquilaTriventekforyourcompany.
What can a dry ice blaster do?
• The dry ice blaster particles accelerated to supersonic speed
• Embrittles coating
• Contaminate is ‘fraked’
• Layer cracks and allows expanding gas to ‘push’ contaminateoff surface
Toobtainlongandtrouble-freeoperationoftheequipmentwerecommendreadingthismanualcarefully.Allnewopera-
torsoftheequipmentshouldalsofamiliarizethemselves with thecontentofthisdocument.
Wedorecommendmakingatrialspotontheobjecttobecleanedtobesuretheblastersettingsarecorrect,andthe
object is notdamaged.
What is DryIce?
Dryiceisfrozencarbondioxide(CO2).Theuniquepropertyofcarbondioxideisthatatatmosphericpressureitchanges
state from solid to gas without going through a liquid phase.
Thisprocessiscalledsublimation.Thispropertyisexploitedforcleaningsincethesolidphasepelletscanbeused
forblastcleaningandtheblastmediaeffectively‘disappears’ asgaswithoutanydamagingorawkwardliquidorsolid
residue.
Rapidsublimationofthedryicepelletasitcontactstheobjectbeingcleanedcausesamicro-explosionasthesolid
expandsinvolume800times,whichistheprimemeansofcausingcontaminatestoberemovedfromthesubstrate.
Thermal effects, differential coefficients of freezing and embrittlement, also contribute to the cleaning effect.
Awidevarietyofsubstratesandcontaminatescanbecleanedsuccessfullyandadvantageouslyusingdryice.Itis
recommended that any applications will be tested at first, to ensure the safety and effectiveness of the procedure.
Pellet size andquality
Formostcleaningpurposesstandard3mmcleaningpelletscanbeused.Theseare commonlyavailableonthemarket
but can also be freshly produced using Triventek dry ice making equipment.
Micro-pellets down to 1.7 mm can be used for extremely delicate cleaning of e.g. fabrics and micro-electronics.
Cleaningquality,andthespeedofcleaning,isalwaysimprovedbyusingthefreshestpossibledryicepelletsofthe
highestquality(e.g.containingminimumwater/moistureorparticulates).Triventekoffersarangeofpelletizerandgas
recovery equipment to assist in ensuring the supplyof high quality, dry ice.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Safety
Safetydataforcarbondioxide(CO2)
Hazards identification
Solid
The blaster equipment uses solid dry ice pellets (also known as: frozen carbon dioxide and ‘Dry-ice’)
Contact with product may cause cold burns or frostbite due tothe low temperature at (minus)-79 C (-110F)
Above -79 C (- 110 F), solid dry ice sublimes into gas. This can cause pressure to build up in e.g. a container which is
not suitably vented.
First aid measures
If contact with eyes: Immediately flush eyes thoroughly with water for at least 15 minutes. In case of frostbite, spray
with tepid water for at least 15 minutes. Apply a sterile dressing. Obtain medical assistance.
Inhalation of sublimated CO2 (gas)
CO
2
isheavierthanairandmayaccumulatetohazardouslevelsinanunventilatedenclosedareasuchasatank,siloor
pit. Always ensure adequate natural or mechanical ventilation.
Use specific ventilation and/or breathing apparatus in any hazardous area such as a tank, silo or pit. CO2 isodorless
therefore it is recommended to use a CO2 detector in working areas.
Low concentrations of CO2 cause increased respiration and headache.
Inhighconcentrationscarbondioxidegascancauseasphyxiationbydisplacingtheoxygenrequiredforbreathing.
Symptomsmayincludelossofmobilityorconsciousness.Victimmaynotbeawareofasphyxiation.
First aid measures
Removevictimtouncontaminatedarea,therescuershouldwearbreathingapparatuse.g.anemergencybreathingair
bottleandmasktoensurethathe/shedoesnotalsofallvictim toasphyxiation.Keepvictimwarmandrested.Calla
doctor. Apply artificial respiration if breathing has stopped.
Exposure controls / personal protection
Exposurelimit: 5000 ppm
Personalprotection: Protecteyes,faceandskinfromcontactwithsolidproduct.Protectskin,especiallyhands,
from cold bywearing insulated gloves.
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Transport information
Avoidtransportofcarbondioxideinsolid,liquidorgasphaseonvehicleswheretheloadspaceisnotseparatedfrom
the driver’s compartment.
Ensurevehicledriverisawareofthepotentialhazardsoftheloadandknowswhattodointheeventofanaccidentoran
emergency.
Before transporting product containers, ensure that they are firmly secured, and that adequate ventilation is provided.
Notethatafterblastcleaningwork,unuseddryicemayremainintheblaster,orintemporarystorageboxes.This
shouldbecarefullyallowedtosublimatebeforetransportationinacompartmentsharedwiththedriver.
Handling and storage of dry ice.
Use only properly specified equipment that is suitable for this product. Contact your supplier if in doubt. Refer to
suppli er’s container handling instructions.
Keep container in a well-ventilated place.
Training
Thehazardofasphyxiationisoftenoverlookedandmustbestressedduringoperatortraining.Beforeusingthisproduct
inanynewprocessorexperiment,athoroughmaterialcompatibilityandsafetystudyshouldbecarriedout
Ensure all national / local regulations are observed. The European Industrial Gas Association (EIGA), see www.eiga.org/,
provides useful background material and guides to good practice.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Safety data for BL25 MINI
Before blasting, be sure to have the right safety precautions arranged i.e. carry out a risk assessment.
Besurethatonlypeoplewhoareproperlytrainedinhandlingtheblaster,andknowtherisksassociatedwithdryice,
are using theequipment.
Secure the area; be sure no unauthorized people will enter the working area.
Please confirm before blasting the nature of the coating or substance which is to be cleaned. In the
case of ha- arduous materials, appropriate safety precautions must be taken, such as Local
Exhaust Ventilation or Personal Protective Equipment.
Always use the following safety precautions:
Face protection or goggles
Wearprotectivegogglesorfaceprotectionwhenoperatingtheequipment,
toprotectagainst‘blowback’ ofthecontaminantbeingremo ved.
Ear protection
Always wear adequate hearing protection
Highnoiselevelscanbeexperienced,dependingonthepressure,dryice
flow and shape of the object being cleaned. Ensure that nearby workers are
not exposed to excessivenoise.
Protective gloves
Alwaysusesuitablyinsulatedprotectivegloveswhenhandlingdryice,or
cold parts of themachinery.
Contact with product may cause cold burns or frostbite.
Breathing apparatus
Where insufficient ventilation, either naturally or by mechanical means,
can - notbeprovidedthenasuitablesupplyofbreathingairshouldbe
arranged.
Insuchcircumstances,itisalsorecommendedthatanemergency
bre athingairbottleandmaskbeprovidedinthevicinityofanycarbon
dioxide operations.
The emergency apparatus is for use by the rescuer in case of any
incapacitation of a person in an area where carbon dioxide has
accumulatedand could cause asphyxiation to the rescuer.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Inhalation of vaporized CO2
Ininsufficiently ventilated spaces suchasa vessel, tankor small
roomanincreasedconcentrationofCO2mightleadtobreathing
difficulties and ultimately to suffocation.
Always ensure a supply of fresh air in enclosed rooms. A CO2
detec tor should be used to confirm safe conditions. Where
necessary, use a breathing mask with suitable fresh air supply.
Caution
Neverblastonpeopleorotherlivingcreatures.Compressedair
stream with pellets maycause severe injuries.
Never touch the pellet stream or the (cold) nozzle during operation!
Donotpermithorseplaywithdry ice.Ensurethatdry icepellets
arenotingested,e.g.bybeingplacedindrinks.
Low temperature
Thedryicepellets’ temperatureis-79°C(-110°F)andthereforecan
cause severe freezeburns.
Donottouchorpermitdirectcontact withdry iceforanyextended
period. Use protective clothing and gloves.
Ensurethatpelletsdonotbecomelodgedunderneathclothingor
other protectiveequipment.
Note:partsoftheBlastermaybecomeextremelycoldduetocontact
withthe dry ice (e.g.the hopper, nozzle,air lock).
Earthing
BEWARE:
Pleaseconnecttheprovided7meters ofcablefromtheblasterto
the objectbeingcleanedtoensureaproperearthinginorderto
avoida staticelectricaldischargecausedbythehighvelocityofthe
pellets/ air stream.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Assembly of the equipment
Transport
After the dry ice blasting unit has been delivered, it must be checked for damage which may have occurred during
transport. Ifnecessary, the transport company must beinformedtoregister thedamage within 24hours.Checkthat all
parts described on the delivery note have been delivered.
Equipment
The BL25 by Aquila Triventek consists of the following items:
• Dry ice blasterunit.
• 7 meters of blasting hose with built-in earthing cable.
• Gun + 1 round nozzle 80/4 mm
• Power supply cable 5 meter
Option:
• Nozzle box with 5nozzles,2 straightextender pipes,1 curved pipeand3connectionpieces.
• Dry ice crusher containing 3 sizes of net
Connecting theequipment
Power:
Connect the power supply cable to an appropriate power supply.
(See reference to check power requirement on CE-sign on machine)
Cable and hose:
Connectthemalesocketofthecontrolcabletothesocket
atthefrontoftheblaster.Oncetheplugislinedup,twist
to secure.
Connecttheblastinghosetothehoseconnectionatthe
lowerfrontoftheblaster.Thisiseasilydonewiththe
snap-fit safety connection by pulling back the collar as
the hose is slid onto the machine.
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Gun and Nozzles
Connect the gun to the control cable and the hose
Ifneeded,connecttheextensionpipe(s)tothegunby
screwingthepiecestogether(hand-tightonly)usingthe
connection piece(s).
Use a connection piece to connect the nozzle to the gun or
extension pipe (if fitted).
Use the twist-grip handle to ensure steady handling.
A variety of nozzles are provided for different cleaning applications.
Itisrecommendedthatatestarea/objectbeselectedtoestablishwhichtheappropriatenozzleforanycleaning job.
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Connecting tocompressor
Connectthecompressedairhosefromtheairsource(e.g.mobilecom-
pressoror fixed compressed air system) to the compressed air inlet on
the back of theblaster.
Ensurethatallhosesarecorrectlyconnectedandcheckthehosesfor
visible damage. Replace if damaged.
Neverdisconnecthoseswhenthesystemisrunningandpressurized.At
theendofablastingsession,firstshutdownthecompressedairsource
and then open the blasting gun trigger to depressurize the system.
Quality
Air quality
Alwaysusecleananddryair.Theairfromthecompressorshouldbedeliveredfreefromoil,particulateorhumidity.
It is recommended to use an after-cooler, water separator, fine oil and particulate filter and in some cases a refrigerant
dryer. If using factory air, from a fixed installation, ensure that consideration has been given to the heavy demand in
terms of volume that the blaster will make.
Pellet quality
Always use “fresh” dry ice pellets with a maximum diameter of 3mm.
Usingpelletscontaminatedwithmoisturecan resultinfreezingoftheairlockrotorplate andhosebyweticeand/orby
clogging.
Makesurethat only CO
2
pelletsareintroducedintothehopper.Anyforeignmaterialinthehopperwillleadtoserious
damage to theairlock.
Keepthehopperlidclosedasmuchaspossibletoavoiddirtfallingintothehopperandtominimizemoistureingress.
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Operating the equipment
Blaster
Top panel
1: Off/Ofn button
ToactivatetheBlaster,turntheOff/OnbuttontoOn.Thebuttonwill
lightgreen and theblaster is readyfor operation.
2: Emergency Stop
PushdownforEmergencyStopoftheblaster.WhenactivatedeverythingattheBlasterisstopped.Besurealsothatthe
operatorknows howtoisolateandshutdownthecompressedairsourceinan emergency.
By turning clockwise (right) the stop button is deactivated, and normal operation will resume.
2
1
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Pressurizing
Openthevalveslowlyattheairsupply(e.g.compressor)totheBlastertoavoidheavypressureshocktothehoseand
Blaster. Such shock can damage the pneumatic components.
Feeding DryIce
NB: Before filling dry ice into the hopper ALWAYS activate the blast function for about 30 sec. by
pressing the button on the gun to empty the hose and machine of humidity or moisture.
Pourdryiceintothehopper.Usefreshdryiceforbestresultsandtoavoidclogging.Closethelidtominimizeevapora tion
of dry ice and the ingress of humidity and dirt.
Use only dry ice. Other material will damage the equipment (and invalidate the guarantee)
Do not overfill the hopper. If the lid cannot be closed, then the hopper is overfilled.
Donotblastforanylengthoftime(afterinitialsystempurging)withoutdryice,sincetherotorwillrunextremelyhot
and may bedamaged.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Start/stop
Start of dry ice blasting
WhentheBlasterisconnectedproperly,correctairpressureisadjustedanddryiceisinthehopper,youarereadyfor
dry ice blasting.
Before starting blasting, have a firm grip of the gun and keep it away from other people. Stand in a safe working positi on.
Tostarticeblastingpushthebuttonatthegunpistolgrip. When starting, keep the gun some distance from object to
be cleaned until you are able to confirm the backpressure of
the gun.
Stop dry ice blasting
To stop, release the buttons at the gun.
Ifstoppingformorethanapproximately30minutes(dependingonroomhumidity),makesurethatthehopperisempty
andblastairthroughthesystemforashortperiodtoensurenodryiceisleftinthesystem.Thisavoidsdryice
clumping in the hopper and airlock chute
When the system is empty, stop blasting to avoid unnecessary wear of the rotating disc
Ifdryicepelletsarenotreturnedtostorage,careshouldbetakentoensuretheirsafedisposal.Avoidleavingpellets
exposedwhereuntrainedpersonsmaybeabletotouchthem,orwheresublimationcouldcauseahazardous
atmosphere.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Cleaning Objects
Attention!
• Small objects should be fixed or mounted properly before blasting.
• Do not leave loose parts in the blasting area.
• Most contaminants tend to pulverize while cleaning. If the maximum total dust concentration of 6 mg/m³ (fine
dust)(orotherlocal/nationalcontrolvalues)isexceeded,a mask mustbeworn.Protectivemeasuresshould
be takensuchasLocalExhaust Ventilationand/orother PersonalProtective Equipment.
A suitable mask or other control measures may be needed to protect against specific hazardous contaminants. In
poorlyventilatedenclosedspaces,forcedventilationorbreathingapparatusmaybeneededtoavoidasphyxiation
by sublimated carbondioxide.
•ThenozzleofthegundischargesgasesandCO
2
pelletsatveryhighvelocities(upto300m/secor1000ft/sec).
Never aimthegunathuman beingsoranimalsorinthedirectionofotherworkersasserious/fatal injuriesmay
be caused.
• When activating blasting, back-thrust, in the opposite direction of the airflow, will occur. In order to anticipate the
reactivethrust, always takeawidestance (feetapprox. 60cm(2ft.)apartandyourupperbodyleaningintothe
direction where the nozzle points).
Maintenance
Activemaintenanceisnecessaryonlyiftheperformanceofthedryiceblastingmachineisnolongersatisfactory.
However,weadvise youtochecktheunit,atregularintervals, asdescribedhereunder.
Casing
Toaccesstheairlockformaintenance,unlockthecabinetlockwiththekey.Theblastercanbeopera ted from therightside, left
side,andfront.Withoutthesidesandfront,youcanhavefull access to internal mechanics.
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Maintenance Inspectioninterval
Check the airlock (pellet distributor system) for excessive air leakage
Every 100 operating hours or every 3 months, whichever comes
first.
Note:therewillalwaysbesmallamountsofair,andveryoccasionalpellet/
fragments/vapor,beingejectedoutofaslotatthesideoftheairlock.Thisis
donetorelieveanyexcesspressurewithintheairlockdryicepockets.
Spacer
If,duringblasting,excessiveairanddryicecomesoutbetweentheupper andloweraluminumpartsandtherotatingdisc,
thisisanindication that therotating dischas worndown ortherotoris damaged.
Inthisevent,eithertherotatingdiscshouldbereplacedorthe4spacers(whichsetthedistancebetweentheupperand
loweraluminumplates)shouldbereplacedwith4smalleronestoensureanadequateseal.Sparesetsofspacersare
provided so that this operation can be carried out conveniently and cheaply.
Thespacersarebasically11mminlength.Theyaremarkedwithseveralnumbersofringstoindicatetheirlengthinterms
of the‘n’ numberafterthedecimalplace.Thus,aspacerwith9ringsis10.9mmlong;aspacerwith8ringsis10.8mm
long.
Check the pneumatic system for air leakage bylistening. If there is any sound of unusual airflow, check the air hoses
visually for leakage.
Adjust theslow start airflowvalve(anti-thrustsetting)
The function of the slow-start air flow valve is to avoid a strong back-thrust
uponactivationoftheblaster.Whenpressingthebuttonsonthegunthevalve
will ensure that the air pressure builds up slowly.
Iftheair-valvedoesnotopenproperly,turnthecontrolpin:clockwise(right)
forslowerpressurebuild-up;anti-clockwise(left)forfasterpressurebuild-up.
Fixthechosensettingbytighteningthecheck-ringatthebaseofthecontrol
pin.
Sometimes the air valve will not open on starting blasting because of dirt,
moistureorexcessive main airpressure, making itdifficult to open the valve.Inthisevent, turnthe controlpin
an ti-clockwise (left)toincreasetheopening pressure from thepneumatic control system.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Dismantle theairlock
Undo the 2 bolts holding the inlet tube using an Allen (hexagon) key.
Undo the 4 bolts at the upper plate, using an Allen key.
Onturningovertheupperplate,removethefeedingslotpiece,whichis
loose.
Lift up, the plastic rotor disc
Remove the spacers.
Onreassemblyoftheairlock,takecaretoensurethatthefeedingslot
piece is held in position and that the O-ring is not damaged or
displa ced.
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Cleaning the equipment
Cleanwithlow-pressurecompressedair.Iftheequipmenthasbecomedirty,itshouldbecleanedbymeansofa
wiper moistened with a cleaning material (degreaser). Donot pressure wash.
Storage
The equipment can be stored in temperatures of - 5 C to + 40 C (23 F to 104 F). Please note, that temperature
chan ges overnight of 20 C (68 F) might cause condensation (dew) inside the electronics, which can cause damage
to the equipment.
Ifcondensationissuspected,thenplacethe equipment ina warmroom(15°C to22°C)(59°Fto72°F) for 1hour
before use.
Recommended spare parts list
Sparepartno. Description
04102500 Rotor
04102511 Air Plate
33275206 O-ring
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Aquila Triventek A/S · Industrivej 9 ·DK-5580 Nørre Aaby · Tel.[phone] · [e-mail] · www.aquila-triventek.com
Troubleshooting
Itisveryimportantthattheequipmentshouldbemaintainedandoperatedasstipulatedinthismanual.
However,ifabreakdownshouldoccur,thefollowingschemecanbeusedfortroubleshooting.
Alwaysensurethatthesystemhasbeenappropriatelyshutdown,de-energizedandde-pressurizedbefore
attempting troubleshooting.
Problem
Possible cause
Solution
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Blaster does not start
Blaster stops
(Motor not running)
No power
Emergency button is pressed
The control button on gun must
be pressed for start-up
Unwantedparticlesorpartsin
airlock.
Overload of the electric motor.
Redlightilluminatedinthereset
button on toppanel.
Damage to control cable
Motor deactivated due to
overload.
Distance too narrow between
top and bottom plates in airlock,
causing the rotor plate to jam.
Checkifmachineisin” on” positionand
buttons is lighting up green
Turnemergencybutton(1/4)clockwise.
Press the control button at gun.
Dismantleairlock.Cleanandcheckfor
damage
Presstheredresetbuttonandthe
inverter/motorisresetautomatically.
Check inverter control for any error
message. A manual explaining the
inverteroperationanderrormessagesis
located,intheelectricalcontrolpanel.
Note that excessive voltage drops
(causede.g.byotherlargeequipment
startingupwhichdrawspowerfromthe
sameelectricalsupply)cancausethe
invertertostop.Ifso,findanother power
source.
Check the airlock.
Check for proper connection and
damage; possibly replace damaged parts
Loosen4boltsintopplatebyturning
bolts (1/4 turn at a time) and try
restarting.
Ifproblemcontinuesthenreplace
spacerswithlargerspacers.

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InallothersituationswekindlyaskyoutocontacttheappointeddistributororAquilaTriventekA/Sforfurther
instructions.
Under no circumstances should an object (such as screwdrivers and similar objects) be put into the rotor plate
inlet below the feed chute. Otherwise you could damage the rotating disc. Such damage is not covered by the
manufacturer’s guarantee.
Problem
Possible cause
Solution
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No or little dry ice delivery
Lowairpressureatnozzle
when blasting
No pellets in the hopper
The blaster hose is twisted
Cloggingofdry-ice.Toomuch
moisture in airsupply
Hopper frozen
The hose, gun, pipe (or ice
crusher,ifused)and/ornozzleis
blocked byaniceplug
Problem with air supply and/or
compressor
Damaged rotor
Blasternozzletoobig
If used, ice crusher is blocked
Fill the hopper with pellets
Checktheblasterhoseanduncoilif
necessary.
Checkthatthecompressorhasawater
separator and after cooler.
Checkwhetherold,softor‘wet’ dryice
has‘bridged’ abovethefeeding blockat
the bottom of thehopper
Remove clumpoficefromoutletof
hopper.
Makesurethathopperlidiskeptclosed
between fillings.
Checkforpelletblockageinsidethe
blaster hose
Ifso,disconnecttheblasterhoseand
gunandletthedryicesublimate.
Sublimationcanbemadefasterby
applyingheat(takingcaretoavoid
damagetoe.g.thesiliconhose)
Ificecrusherblocks,ensurethatalarge
aperturenozzle(e.g.100/15)isbeing
used;tryhigherpressure,orolder,softer
dry ice, or larger size grating
Checkairpressureatthemanometeron
thecompressor/airsupply.Checkair
supply hoses.
Check the airlock
Change to a smaller nozzle
See above re ice crusher

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Technical data
Dimensions
L:560mm W:550mm H:720/985 mm
Weight
49kg
Hopper
6Kg
Air pressure
Min: 2bar Max: 10bar
Power supply
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110 V-230 V
AC 50-60 Hz
Air flow range
Dry ice consumption
Noise
0,6-3 m3/min
40 Kg/h
86-120dB (at 6 bar pressure)