Buhnen HB 710 User manual

Operating Manual
Hot Melt Applicator
HB 710/HB 710 Spray

1 General ..................................................................................................................................................................... 2
1.1 Scopeofuse.......................................................................................................................................................... 2
1.2 Technicaldata........................................................................................................................................................ 2
2 Safety instructions .................................................................................................................................................. 3
2.1 Potentialhazards................................................................................................................................................... 3
2.2 Instructionsforsafeoperation............................................................................................................................... 3
3 Starting ..................................................................................................................................................................... 4
3.1 Connectingup........................................................................................................................................................ 4
3.1.1 Connectingup(operationwithoutworkingbracket/workstation).............................................................................................. 4
3.1.2 Connectingup(operationwithworkingbracket/workstation)................................................................................................... 4
3.2 Switchingon.......................................................................................................................................................... 4
3.3 Settingsonthetemperatureregulator................................................................................................................... 5
3.3.1 Settingtheworkingtemperature.............................................................................................................................................. 5
3.3.2 Readingoutandsettingthecontrolparameters...................................................................................................................... 5
4 Operation ................................................................................................................................................................. 6
4.1 Operatingposition.................................................................................................................................................. 6
4.2 Charging................................................................................................................................................................ 7
4.3 Dischargingandmeteringmelt.............................................................................................................................. 7
4.4 Adjustingthespraypattern(HB710Sprayonly)................................................................................................... 8
4.5 Automatictemperaturereduction(ACE)................................................................................................................ 8
4.6 Switchingoff.......................................................................................................................................................... 8
5 What if... ................................................................................................................................................................... 8
5.1 Statusanderrormessagesinthedisplay.............................................................................................................. 8
5.2 Troubleshooting..................................................................................................................................................... 9
6 Servicing/maintenance ......................................................................................................................................... 10
6.1 Serviceintervals.................................................................................................................................................. 10
6.2 Cleaning............................................................................................................................................................... 10
6.2.1 Cleaningthenozzle.................................................................................................................................................................11
6.3 Nozzlesystems.....................................................................................................................................................11
6.3.1 Replacingtheconenozzle(HB710).......................................................................................................................................11
6.3.2 Replacingthenozzleend(HB710)........................................................................................................................................11
6.3.3 Replacingtheswirlnozzle,pressurespring&ball(HB710Spray)....................................................................................... 12
6.4 Adjustingthecoverpressure............................................................................................................................... 12
6.5 Replacingthecovergasket................................................................................................................................. 13
6.6 Replacingthevalveassembly............................................................................................................................. 14
6.7 Replacingthe(complete)cover........................................................................................................................... 15
7 Repairs ................................................................................................................................................................... 16
8 Warranty ................................................................................................................................................................. 16
9 Disposal ................................................................................................................................................................. 16
10 Spare parts ............................................................................................................................................................ 17
10.1 HB710................................................................................................................................................................. 17
10.1.1 BaseUnit................................................................................................................................................................................ 17
10.1.2 MeltTank................................................................................................................................................................................ 18
10.1.3 NozzleKit............................................................................................................................................................................... 19
10.2 HB710Spray...................................................................................................................................................... 20
10.2.1 BaseUnit................................................................................................................................................................................ 20
10.2.2 Melttank.................................................................................................................................................................................. 21
10.2.3 NozzleKit............................................................................................................................................................................... 22
10.3 Closure................................................................................................................................................................ 23
10.4 WorkingBracket.................................................................................................................................................. 24
10.5 WorkstationKit..................................................................................................................................................... 25
11 Diagrams ................................................................................................................................................................ 26
11.1 Wiringdiagram..................................................................................................................................................... 26
11.2 Pneumaticdiagram.............................................................................................................................................. 27
Table of Contents

1
Working bracket
Working brackeet
Applicator
Pos. Description Pos. Description
1 Compressedairconnection 10 Lever
2 Waterseparator 11 Closurecap
3 Pressureregulator 12 Suspensionpoint
4 Pressuregauge 13 Protectioncap
5 Digitaldisplay 14 Sprayairchoke
6 Start/Stopbutton 15 Protectioncap
7 Setbutton 16 Trigger
8 Downbutton  17 Handle
9 Upbutton 18 Standhoop
Arrangement

2
1 General
PleasereadthisOperatingManualthroughcarefullyandcompletelybeforerstusingthe
Applicator.PayparticularattentiontothesafetyinstructionsinSection2.
ThisOperatingManualmustalwaysbewithineasyreachforanyuser.
1.1 Scope of use
TheHB710/HB710SprayApplicatorisforthemeltingandmetereddischargeofmelts
(thermoplasticsubstancessuchashot-meltadhesives,waxes,etc.)asabead(HB710)
orspray-oncoating(HB710Spray)usinginterchangeableapplicationtools(useasin-
tended).
1.2 Technical data
Model HB 710 HB 710 Spray
PartNo. H218600 H218700
Kitincludes Applicator,toolset,workingbracket/workstation(optional)
Weight approx3lbs/1.35g approx3.3lbs/1.50kg
Powerconnection 120VAC/60Hz/earthing-pinplug
Powerrequirement[W] 600
Powerconsumption[A] 2.6
Protection(asperDINIEC34T5) IP30
Safetyclass
(asperDINVDE0720)
I(safetyearthterminal)
Temperaturecontrol electronic
Temperaturelimitation thermalcut-out(500°F±19.8°F/260°C±11°C)
Operatingtemperature 104°F…410°F/40°C…210°C
Temperatureconstancy ±3.6°F/±2.0°C
Factorypresetting 356°F/180°C
Temperatureindication digitalviaLEDdisplay
Automatictemperaturereduction
(ACE)
Factorypresettoreducetemperatureby104°F/40°C
after30minnon-use
Warm-uptime[min] ~3.0…4.0
Hot-meltingcapacity(dependent
onmelt)
withplugs:7.05lbs/h/3.20kg/h
withgranulate:2.87lbs/h/1.30kg/h
Capacityofmeltreservoir 7.76oz/200ml
Conveyorsystem compressedair
Compressed-airconnection max.145psi/10bar(serviceunitwithquick-actioncoupling)
Thecompressedairmustbecondensate-andacid-free
Operatingpressure 21.8…87.0psi/1.5…6.0bar
Protectionagainstoverpressure limitedbyreducingvalveto87psi/6bar
Airconsumption(at72.5psi/
5baroperatingpressure)
33.8oz/1lpertriggeractuation max.33.8oz/s/1l/s
Nozzles(standard) conenozzleØ1.5mm swirlsprayheadØ1.5mm
Lengthofsupplylinewith
electricalandpneumaticconnec-
tions
9.84ft/3.0m
Recommendedmeltingstock BÜHNENhot-meltadhesivesinplugorgranularform
General

3
2 Safety instructions
2.1 Potential hazards
Danger!
Neverpointtheoperation-readydeviceatpeople.
Dangerfromhighpressure!
Burn Hazard
Nozzle(1)andmoltenadhesivecanbeover390°F/200°Chot.
Wearheat-resistantglovesifcontactisunavoidable.
Risk of Explosion!
Whenworkingwithoxygenorcombustiblegasesthereisriskofexplosion!
Xi Odor nuisance!
Hot-meltadhesivesgiveofffumeswhichcancauseodournuisance–soensure
adequateventilation.
Improperusemayinisolatedcasesleadtoirritationofthemucousmembrane.Inthis
caseseekimmediatemedicaladvice!
2.2 Instructions for safe operation
Guardagainstmalfunctionsandoperatingerrorsbyalwaysfollowingtheseinstructions
precisely:
• Innocircumstancesmaythemaximumpermittedoperatingpressure(87psi/6bar)be
exceeded.
• Removecombustibleorheat-sensitiveobjectsfromtheareaofthenozzle(1).
• Whenwarmthedevicemustbeputdownonthesupporthoop(18)orworkingconsole.
Itmustnotbelaidonitsside.
Otherwisemeltmayescapeuncontrolledthroughtheventholesandpresentaburn
hazard.
• Neveroperatethetrigger(16)forcibly.
• Protectthedevicefrommoistureanddamp(protectionagainstelectricshock).
• Observetheinstructionleaetforthehot-meltadhesive(protectionagainstprocessing
errors).
• Operatethedeviceonlywiththenozzlepointingdownwards.Itmustnotbeoperated
aboveheadheight!
• Unplugfromthemainsbeforeperforminganyoperationonthedevice(servicing,clean-
ing).
• Thedevicemustbepoweredonlyfromsocketswithaprotectiveconductor.
• Anyextensioncableusedmusthaveaprotectiveconductor.Checkthattheprotective
conductorisundamagedbeforeuse.
• Unplugfromthemainsaftereachuse.Allowthedevicetocooldowncompletelybefore
puttingitaway.
• Ifyounoticeanydamagetothedeviceorleads,unplugfromthemainsimmediately.
Havethedevicepromptlycheckedoverbyanexpert.Itmustnotbeusedagainuntilit
hasbeenproperlyrepaired(seeSections6and7).
Safety instructions

4
3 Starting
3.1 Connecting up
3.1.1 Connecting up (operation without working bracket/workstation)
Toconnectupthedeviceproceedasfollows:
1. Fitthestand:
• Todothisinsertpin(B)ofthebase(1)intohole
(A)inthecasing.
•Movethebase(1)indirection(C)untilitisjust
incontactwiththecasing.
•Todismantlethebasedotheaboveinreverse
order.

2. Placethedeviceonthebaseandstandhoop.
3. Fitthesuppliedpressure-reducingvalvetoaquick-actioncouplinginthecompressed-
airsupply.Thewaterseparatormustbefacingdownwardswhenyoudothis.
Observetherequirementsmadeofthecompressed-airsupply(Section1.2,“Technical
data“).
4. Settheoperatingpressureto58psi/4barwiththepressureregulator(3).
5. Connectthemainsplugtoasocketoutletwithearthingcontact.
6. Switchonthedevice.
Thedeviceisnowreadyforuse.
3.1.2 Connecting up (operation with working bracket/workstation)
Toconnectupthedeviceproceedasfollows:
1. Placethedeviceintheworkingbracket.
2. Attachtheworkingbracket’scompressed-airconnection(1)(seeillustrationonp.20)to
thecompressed-airsupply.
Observetherequirementsmadeofthecompressed-airsupply(Section1.2,“Technical
data“).
3. Settheoperatingpressureto58psi/4barwiththepressureregulator(3).
4. Connectthemainsplugtoasocketoutletwithearthingcontact.
5. Switchonthedevice.
Thedeviceisnowreadyforuse.
Info
Thedisplayisswitchedonbriey(approx.1sec)asacheckafterthepowerplugis
insertedandafteramainsvoltagefailure: .
Thedevicethenswitchesoffforsafetyreasons
3.2 Switching on
ToswitchthedeviceonpressandholdtheStart/Stopbutton(6)foratleast1s.
Thedigitaldisplaylightsupandindicatesthecurrenttemperature.Thedeviceheatsup
immediatelytothepresettemperature(targettemperature).Thedecimalpointontheleft
ashesuntilthetargettemperaturehasbeenreached.
ThetargettemperaturecanbedisplayedbypressingtheSetbutton(7).
Starting

5
3.3 Settings on the temperature regulator
3.3.1 Setting the working temperature
1.TosettheworkingtemperaturepresstheSetbutton.Thecurrentworkingtemperature
isdisplayed.
2. HoldtheSetbuttondown.SelecttherequiredworkingtemperatureusingtheUp/Down
buttons.
BrieypressingtheUporDownbuttonchangestheworkingtemperatureinstepsof
1°F/1°Cperbutton-press.Pressingthebuttonforlongerchangestheworkingtem-
peraturecontinuously.
Thenewsettingissavedautomaticallywhenthebuttonsarereleased.
3.3.2 Reading out and setting the control parameters
PressingtheUpandDownbuttonssimultaneouslyforatleast4sbringsupaparameter
list.Someparameterscanbeset,othersonlyreadout.Thetablebelowsummarisesthe
parameters:
Pa-
ram-
eter
Function Settable Setting
range
Standard
value
Customer
value
P1 Setpoint lowering
Ifthedeviceisnotusedforsometime,the
temperatureregulatorautomaticallyswitchesto
operationatloweredtemperature.Atemperature
isadjustedtowhichisbelowthesetworking
temperaturebythevaluesethere.
✓1…180°F
1…100°C
72°F
40°C
P2 Waiting time before setpoint lowering
Ifthedeviceisnotusedforlongerthanthetime
sethere,temperatureloweringstarts.
✓1…999min 30min
P11 Hours-run counter
Thehundreds,tensandunitsdigitsaredisplayed.
-
P12 Hours-run counter
Thethousandsdigitsaredisplayed.
-
P13 Number of actuations
Thehundreds,tensandunitsdigitsaredisplayed.
-
P14 Number of actuations
Thethousandsdigitsaredisplayed.
-
P19 Keylock
AdjustmentofworkingtemperaturewiththeUp/
Downbuttonscanbelockedhere.
Ifanattemptismadetoadjusttheworkingtem-
peraturedespitethekeylock,thedisplayshows
“--”
0:notlocked
1:locked
✓0or1 0
YoucanbrowseupwardsthroughtheparameterlistwiththeUpbuttonanddownwards
withtheDownbutton.Pressthe“Set”buttontodisplaythevalueassignedtoaparameter.
YoucanadjustthevalueassignedtoasettableparameterbyadditionallypressingtheUp/
Downbuttons.
Thediagrambelowshowstheprocedureschematically:
Starting

6
SET
SET
SET
SET
+
+
+SET +
-
>4 s
P1
P2
P11
…
Display
value
Set
value
(only P1, P2, P19)
Fig. 3.3.2/1: Setting parameters
4 Operation
4.1 Operating position
Thedevicemaybeoperatedonly with the nozzle pointing downwards.Inotherposi-
tionsmeltmaygetintothecompressed-airductsanddamagethedevice.
Fig. 4.1/1: Permitted operating position
Operation

7
4.2 Charging
Burn hazard!
Nozzleandmoltenadhesivecanbeover390°F/200°Chot.Alwayswearheat-resistant
gloveswhenperformingthestepsdescribedbelow.
1. Placethedeviceintheworkingbracketoronthebase.
2. Switchthedeviceon(seeSection3.2).Waituntiltheworkingtemperaturehasbeen
reached.
3. Takeholdofthedevicebythehandlewithonehand(17).Withtheotherhandturnthe
lever(10)clockwisethrough180ºandswiveltheclosurecapopen.
4. Fillthetanktoalevelnotlessthan2cmbelowtherim.Themaximumlevelismarked
onthedevicewithasticker(seeillustrationleft).Donotchargethedeviceabovethis
levelsincethemeltexpandswhenheated.
5.Swiveltheclosurecapback.Turnthelever(10)anticlockwiseasfarasitwillgo,in
ordertolockthecap.
4.3 Discharging and metering melt
1. Placethedeviceintheworkingbracketoronthebase.
2. Switchthedeviceon.Waituntilworkingtemperaturehasbeenreached.
3. Checkthatthereisenoughmeltinthetank.
Burn hazard!
Ifthedeviceis“rundry”dropsofmeltmayescapeuncontrolledandendangertheopera-
torandpersonsinthevicinity.
Everytimeyouactuatethetrigger,therefore,rstcarryoutstep(3.)above.
4. Actuatethetrigger(16)
Youcanmeterthequantitydischargedbyalteringthepressure(max.87psi/6bar)at
thepressureregulator(3)and/orselectinganappropriatenozzle.
5. Afterthetrigger(16)hasbeenreleasedthecompressed-airsupplyiscutoffimmedi-
atelyandthetankvented.
max. Level
Operation

8
4.4 Adjusting the spray pattern (HB 710 Spray only)
Thespraypatternisalteredbyadjustingthesprayair.
Settheoptimumspraypatternbyturningthespray-airchoke(14)intheprotectivesleeve
(13):
• Turningitclockwisedecreasesthespray-airpressure.
• Turningitanticlockwiseincreasesthespray-airpressure.
4.5 Automatic temperature reduction (ACE)
Unnecessarythermalloadingofthemeltshouldbeavoided.Thedevicethereforeswitch-
estostandbymodeatreducedtemperaturewhenthetriggerhasnotbeenactuatedfora
considerabletime(pausedoperation).
Intheconditionassuppliedthetemperatureisreducedby72°F/40°Cafter30minutes’
pausedoperation.TheprogrammingoftherelevantparametersisdescribedinSection
3.3.2.
BrieyactuatethetriggerortheUporDownbuttontoquitstandbymode.Thedeviceim-
mediatelyreheatstoworkingtemperature.
4.6 Switching off
1. PresstheStart/Stopbutton(6)forapprox.1suntilthedisplaygoesout.
2. Adjusttheoperatingpressuredownto“0”withthepressureregulator(3)ordisconnect
thecompressed-airsupply.
5 What if...
ThisSectionsummarisesthestatusanderrormessagesandprovideshelpineliminating
errors.
Ifmalfunctionsoccurpleasecheckrst
• hatthepowersupplyand
• compressed-airsupplyarefunctioningcorrectly,and
• whetherthereismechanicaldamagetothedeviceorsupplylines(powersupply,com-
pressedair).
Ifyoundanymechanicaldamage,thedevicemayinnocircumstancesbestartedup
again.Haveitcheckedandrepairedbyaqualiedserviceagent.
5.1 Status and error messages in the display
Indication Cause Action
Decimalpointonleftashes Warm-upphaseactive Thewarm-upphaseisendedwhenatem-
perature2°F/2°Cshortofthesetworking
temperaturehasbeenreached.
Decimalpointonrightislit Setpointloweringactive SeeparametersP1andP2(Section3.3.2)
ERR Permittedmaximumtem-
peratureof500°F/260°C
exceeded
Allowtocooldown
F1L Sensorfault,shortcircuit Havethedevicecheckedbyaqualied
serviceagent.
F1H Sensorfault,sensorbreakage Havethedevicecheckedbyaqualied
serviceagent.
-- Keylockactive SeeparameterP19(Section3.3.2)
EP Datalossinparametermemory Theregulatormustbereplacedbyaquali-
edserviceagent.
What, if…

9
5.2 Troubleshooting
Fault Possible cause Remedy See Section
Controllercannotbeswitched
onoroff
Microswitchattrigger
continuouslyactivatedor
defective
Eliminatedeadlockatmicro
switch(sheetmetaltongue)
orreplacemicroswitch
Nozzlegoesondripping Nozzlevalvepartiallyob-
structedordamaged
Drainthedevice.Actuate
thetriggerforapprox.5sto
clearthenozzle.
HB710:
Cleanorreplacenozzleend
HB 710 Spray:
Cleanorreplaceswirl
nozzle,pressurespringand
ball
6.2
Toolittleornomeltisdis-
charged
Operatingpressuretoolow Increaseoperatingpressure
(max.687psi/bar)
4.3
Compressed-airsupply
disconnected
Checkcompressed-airsup-
ply
Nozzlesystemclogged HB710:
Cleanorreplacecone
nozzleandifnecessary
nozzleend
HB 710 Spray:
Cleanorreplaceswirl
nozzle,pressurespringand
ball
6.2,6.3
Stocktemperaturetoolow Raisetemperature 3.3.1
Compressedairescapesfrom
closurecap(11)
Insufcientcoverpressure Increasecoverpressure 6.4
Gasketdirty Cleansealingfaces
Compressedairescapesfrom
serviceunit
Connectionsnotairtight Tightenorreplacegaskets
Sightglassofwatersepa-
rator(2)cracked
Replacesightglass
HB 710 Spray only
Spraypatternnotideal Spraypatternwronglyset Adjustsprayair 4.4
Nozzlesystemcloggedor
damaged
Cleanorreplaceswirl
nozzle,pressurespringand
ball
6.3.4
What, if…

10
6 Servicing/maintenance
Danger!
Dangerduetoinadvertenttriggering.
Disconnectthecompressedairsupplybeforeallmaintenanceandservicework.
Danger! 
Voltagehazard.
Alloperationswhichnecessitateopeningthedevicemaybeperformedonlybyqualied
electricians.
Burn hazard!
Nozzle(1)andmoltenadhesivecanbeover390°F/200°Chot.Wearheat-resistant
gloveswhenperformingservicingandmaintenanceoperations.
6.1 Service intervals
Observethestatedserviceintervalstoensurealwayscorrectandreliableoperation:
Weekly: Inspectandifnecessarydraintheservice-unitwaterseparator(seeFig.6.1/1)
Checkthatallpartsarepresent,leak-freeandundamagedandallscrewsandlinessecurely
seated
Removeadhesiveresiduesandothercontaminants,especiallyontheinsideofthecover
MAX max. level
press to drain
Fig. 6.1/1: Draining the water separator
6.2 Cleaning
• Donotuseaggressivecleaningagentsforcleaningthedevice.Thesemaydamage
devicecomponents.
Werecommendcleaningwithparafnoil.
• Replacecompletelypartswhicharenolongercleanable(e.g.becauseofburnt-onor
reactedhot-meltadhesive).Werecommendhavingthisworkdonebythemanufacturer
ordistributor.
• Removeresiduesofhot-meltadhesiveandothercontaminantsbymechanicalmeans
only,e.g.withacloth,softbrush,woodenspatulaorsimilar.
Servicing/maintenance

11
6.2.1 Cleaning the nozzle
• Wipethenozzlewithaclothtoremoveslightexternaldirt.
• Toremoveblockagesinsertadrillbit,needleorwireofsuitablediameterintothe
nozzleorice.
Instubborncasesreplacethenozzle(seeSection6.3).
6.3 Nozzle systems
HB 710 HB 710 Spray
Valve seat (A6)
Nozzle foot (A5)
Protection cap (A4)
Washer (A3)
Locking ring (A2)
Cone nozzle (A1)
Nozzle block (B7)
Protection cap (B6)
Ball (B5)
Pressure spring (B4)
Swirl nozzle (B3)
Air cap (B2)
Cap ring (B1)
Fig 6.3/1: Nozzle systems in detail
6.3.1 Replacing the cone nozzle (HB 710)
Tools needed • 2open-endspannerssize19
• 1Seegercirclipringpliers
1. Disconnectthecompressedairsupply.
2. Letthedeviceheatupthoroughly.
3. Securethenozzlefoot(A5)andunscrewtheconenozzle(A1).
4. Screwonthenewconenozzle(A1)byhandrstandallowtoheatupfor2minutes.
5. Re-securethenozzlefoot(A5).Tightenthenewconenozzle(A1)withoutusingforce.
6. Assembletheremainingpartsinreverseorder.
6.3.2 Replacing the nozzle end (HB 710)
Tools needed • 2open-endspannerssize19
• 1open-endspannersize36orpipewrench
• 1Seegercirclipringpliers
Theremustbenomeltatallinthetankwhenthenozzleendisreplaced.
Thereforedischargethemeltcompletely,e.g.intoacollectingvessel.
1. First,proceedasdescribedinchapter6.3.1uptoPoint3(dismantlingthenozzle).
2. Removethelockingring(A2).
3. Removethewasher(A3)andtheprotectioncap(A4).
4. Securethevalveseat(A6)withtheopen-endspannersize36orthepipewrench.
Unscrewthenozzlefoot(A5).
5. Screwonthenewnozzlefoothandtight.Nowtightenlightly(withoutusingforce)with
theopen-endspanner.
6. Assembletheremainingpartsinreverseorder.
Servicing/maintenance

12
6.3.3 Replacing the swirl nozzle, pressure spring & ball (HB 710 Spray)
Tools needed • 1hookspanner
• 1open-endspannersize11
• 1open-endspannersize32orpipewrench
Theremustbenomeltatallleftinthetankwhenthenozzleendisreplaced.Therefore
dischargethemeltcompletely,e.g.intoacollectingvessel.
1. Disconnectthecompressed-airsupply.
2. Releasethecapring(B1)byturningitwhen warmwithoutusingforce.
3. Removetheprotectioncap(B6)andaircap(B2).
4. Loosentheswirlnozzle(B3)withtheopen-endspannersize11.Fixitbylocknutwith
theopen-endspannerSW32orpipewrench.
5. Removethepressurespring(B4)behindtheswirlnozzleandtheball(B5).
6. Fitthenewcomponentsinreverseorder.
6.4 Adjusting the cover pressure
Tools needed • 1hexagonsocketspannersize1.5
• 1hexagonsocketspannersize2,5
• 1hexagonsocketspannersize3
C1
C2
C3
C4
Fig. 6.4/1: Adjusting the cover pressure
1. Rotatethelever(C3)clockwiseandswivelthecoveruntilfullyopen.
2. Loosentheleverxingscrew(C4)withthehexagonsocketspannerSW3.
Withdrawthescrew.
3. Loosentheclampingscrew(C1)withthehexagonsocketspannersize1.5(approx.1,5
turns).
4. Insertthehexagonsocketspannersize2.5intotheadjustingscrewthroughthelever
screw-hole.Turntheadjustingscrewclockwiseinitiallybyapprox.90°.
5. Closeandlockthecover.
Ifthecoverwillnotclose,keepturningtheadjustingscrewback(clockwise)byapprox.
15°untilthecovercloseseasily.
6. Actuatethetrigger.
•Ifthecovernowclosescorrectly,proceedatstep7.
•Ifthecoverstilldoesnotclosecorrectly,repeattheadjustmentfromsection4.
7. Openthecoveragain.
8. Tightentheclampingscrew(C1).
9. Fittheleverxingscrew(C4).
Servicing/maintenance

13
6.5 Replacing the cover gasket
Tools needed • 1Phillips-typescrewdriversize1
D4
D3
D5
D6
D2
D1
Positioncarefullywhenassembling
Fig. 6.5/1: Replacing the cover gasket
Theremustbenomeltatallleftinthetankwhenthecovergasketisreplaced.Therefore
dischargethemeltcompletely,e.g.intoacollectingvessel.
1. Letthedeviceheatup.
Continueactivatingthetriggeruntilthetankiscompletelyempty.
2. Disconnectthecompressedairsupply.
3. Disassembletheentireclosureunit(seeChapter6.7).
4. Releasethefasteningscrews(D1)ofthesealingplate(D2)withthePhillipsscrew-
driver.Carefullyremovethesealingplate.
5. Carefullyremovethegasket(D5)fromthepressureplate(D6).
6. Setthenewgasketinthepressureplateinsuchawaythatittsevenlyallover.
7. Mountthesealingplate.Observethepositionofthewasher(D3)andtheO-ring(D4)of
theventilationopening.Tightenthecounternuts(D1)alternately.
Servicing/maintenance

14
6.6 Replacing the valve assembly
Tools needed • 1hexagonsocketspannersize1
• 1hexagonsocketspannersize2.5
• 1hexagonsocketspannersize3
• 1auxiliaryscrewM4
E1
E2
E3
E4
E5
E6
E7E8
E9E10
E11
Fig 6.6/1: Replacing the valve assembly
1. Letthedeviceheatup.Continueactivatingthetriggeruntilthetankiscompletely
empty.
2. Withthecoverclosedundothexingscrew(E1)ofthelever(E2)withthehexagon
socketspannersize3.Removetheleverandcarrier(E3).
3. Undothescrews(E4)withthehexagonsocketspannersize2.5.Removethecover
casing(E5).
4. ScrewtheauxiliaryscrewM4intotheclampingpiece(E7).Releasetheclamping
screw(E6)withwasherwitha2.5mmAllenkey.Carefullyremovetheclampingpiece
withauxiliaryscrewM4fromthevalvehousing.Alsoremovethespring(E8)andthe
cone(E9).
5. Decreasethepressureto14.5…29psi/1....2bar.Brieyactuatethetrigger.Theburst
ofpressureejectsthevalve(E9)andspring(E10)fromthevalvehousing.Holdacloth
infrontoftheopeningtocatchthese(hot!)parts.
6. Fitthenewcomponents,covercasingandleverinreverseorder.
Servicing/maintenance

15
6.7 Replacing the (complete) cover
Tools needed •1hexagonsocketspannersize2.5
• 1hexagonsocketspannersize3
• 1open-endspannersize13
F1
F2
F3
F4
F5
F6
F7
F9
F10
F8
Fig. 6.7/1: Replacing the cover
1. Letthedeviceheatup.Continueactivatingthetriggeruntilthetankiscompletelyempty.
2. Withthecoveropenundothexingscrew(F1)ofthelever(F2)withthehexagonsocket
spannersize3.Removetheleverandcarrier(F3).
3. Undothescrews(F4)withthehexagonsocketspannersize2.5.Removethecovercas-
ing(F5).
4. ReleaseandremovetheSeegercirclipring(F6).
5. Pulltheentireclosureunit(F7)offfromtheaxle(F8).Carefullysetthenewclosureunit
ontheaxle.
6. MounttheSeegercirclipring(F6).
7. Releasethecounternut(F9)withtheSW13open-endwrench.
8. Adjustthetieboltbytwistingitsothatitsfootslidescleanlyintotherecessinthehous-
ingwhenthelidcloses.Thenretightenthecounternuts.Checkagaintoseeifthecover
closescleanly.Ifnecessary,readjustthetiebolt.
9. Mountthecovercasingandthelever.
Servicing/maintenance

16
7 Repairs
RepairsotherthanthosedescribedinthisOperatingManualmaybeundertakenonly
bypersonsappointedbythemanufacturerorothertechnicallycompetentpersonsusing
BÜHNENoriginalreplacementparts.
8 Warranty
Thedevicehasbeendevelopedandmanufacturedinaccordancewiththemostup-to-
datetechnicalknowledge.Weprovidetheinitialpurchaserwithawarrantyaccordingto
statutoryrequirementsforfunction,materialsandprocessing.Normalwearandtearis
excepted.
Thewarrantyendsifimpropertreatment,useofforce,repairsbythirdpartiesorthetting
ofnon-originalreplacementpartsisevident.
Thewarrantycoversrepairorreplacementatourdiscretion.Awarrantyextendingbeyond
thekitsuppliedbyusisprecluded,sinceproperandexpertuseofthedeviceisoutside
ourcontrol.
Pleasenoteourtermsofbusiness!
9 Disposal
Passthedevice,packingandttingsforenvironmentallycorrectrecycling/reuse(inac-
cordancewithEuropeanParliamentandCouncilDirective2002/96/ECof27thJanuary
2003).
Repairs

Spare parts
17
10 Spare parts
10.1 HB 710
10.1.1 Base Unit
H218643
6, H206065
Spare parts list
Pos. Order no. Quantity Designation
1H105703 1 Warninglabel
2H206030 1 Gripshellkit
3H206033 1 Trigger
4H206034 1 Tankinsulation
5H206039 1 Standhoop
6H206065 1 Supplycable3mUS
7H218643 1 Thermostatcomplete120V
8H206048 1 Microswitch
9H206101 1 Valvecomplete
10 H206104 1 Foot
11 H206135 1 Protectioncap
12 H212002 1 Warninglabel
13 KD0400 1 Dowelpin
14 KD0495 11 Screw
15 KDN0726 2 Washer
16 KDN1078 2 Dowelpin
17 MD0060 1 Suspensionring
18 MDM0201 2 Clamp
19 MDM0202 1 Clamp

Spare parts
18
10.1.2 Melt Tank
4, H206648
Spare parts list
Pos. Order no. Quantity Designation
1 H206004 1 Temperaturetracer
2 H206018 1 Hose
3 H206020 1 Rib
4 H206648 1 Heater
5 H217195 1 Tankunit
6 H217196 1 frontkitunitbead
7 KDN0517 2 Screw
8 KDN0529 1 Toothedwasher
9 KDN0681 2 Screw
10 KDN0704 1 Screw
11 KDN0726 1 Washer
12 LD0074 3 O-ring
13 LDF0019 2 Sealingring
14 LDH0143 2 O-ring
15 LDN0131 1 O-ring
16 MC0094 1 Hoseconnector
17 NC0093 1 Thermostat