Danfoss Termix VMTD-I Operating instructions

Brand: Danfoss

Model: Termix VMTD-I

Type: Operating instructions

Danfoss Termix VMTD-I is a complete solution with built-in water heater and a differential pressure controlled heating system. The product is designed for wall-mounting and its application includes usage in single family houses and in decentralized systems. District heating (DH) is prefabricated with a differential pressure controller, a fitting piece and sensor pockets for insertion of an energy meter as well as strainer. The energy meter is mounted on a bracket underneath the substation. The heating circuit is designed for direct heat generation.

InstallationGuide

TermixVMTD-Iwithcompleteinsulation

1.0TableofContents

1.0TableofContents.............................................1

2.0VMTD-IinsuIHPTFunctionaldescription...........2

3.0Safetynotes.....................................................3

3.1SafetyNotes–general............................................3

4.0Mounting........................................................4

4.1Mounting...........................................................4

4.2Start-up..............................................................5

5.0Design.............................................................6

5.1Design...............................................................6

5.2Schematicdiagram................................................7

6.0Controls..........................................................8

6.1Heatingcircuit......................................................8

6.2DHWtemperaturecontrol........................................8

6.3Other.................................................................9

6.4Extras................................................................10

6.5Mountingplateforenergymeterdisplay.....................11

6.6Maintenance........................................................12

7.0Troubleshooting..............................................13

7.1Troubleshootingingeneral......................................13

7.2TroubleshootingDHW............................................13

7.3TroubleshootingHE...............................................14

7.4Disposal.............................................................15

8.0Declaration......................................................19

8.1Declarationofconformity........................................19

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2.0VMTD-IinsuIHPTFunctionaldescription

Districtheatingsubstationfordirectheatingand

instantaneousdomestichotwaterwithow-compensated

temperaturecontroller.Designedforwall-mounting.

Application

TheTermixVMTD-Iisacompletesolutionwithbuilt-inwaterheater

andadifferentialpressurecontrolledheatingsystem.Termix

VMTD-Iisapplicableforsinglefamilyhousesandfordecentralized

systems.

Districtheating(DH)

Thesubstationisprefabricatedwithadifferentialpressure

controller,attingpieceandsensorpocketsforinsertionofan

energymeteraswellasstrainer.Thedisplayoftheenergymeteris

tobemountedonabracketunderneaththesubstation.

Heating(HE)

Theheatingcircuitisdesignedfordirectgenerationofheat.

Thedifferentialpressurecontrolsetstheoptimumoperation

conditionsforradiatorthermostaticvalvesinordertoenable

individualtemperaturecontrolineachroom.Inordertoenablea

time-dependingtemperaturecontrolprogram,azonevalvewith

actuatorisincluded,andaroomthermostatcanbeincludedas

anoption.

Domestichotwater(DHW)

Thedomestichotwaterispreparedintheheatexchangerandthe

temperatureisregulatedwithaowcompensatedtemperature

controllerwithintegrateddifferentialpressurecontroller.Theheat

exchanger-whichisinsulated-coolstheDHwaterveryefciently,

therebycreatinganexcellentoperatingeconomy.TheIHPTvalve

ensuresastablehotwatertemperaturebyvaryingloads,supply

temperaturesandbyhighandvaryingdifferentialpressurewithout

theneedforreadjustingthevalve.Thisprotectstheheatexchanger

againstoverheatingandlimescaleformation.Furthermorethe

IHPTvalvehasanintegratedidletemperaturecontroller,which

keepsthehousesupplylinewarm.Thisshortensthewaiting

periodsduringsummerwhentheheatingsystemisinreduced

operation,whichisidealwherehighcomfortisrequested.AWRAS

approvednon-returnvalveisttedinthecoldwatersupply.

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3.0Safetynotes

3.1SafetyNotes–general

Thefollowinginstructionsrefertothestandarddesignof

substation.Specialversionsofsubstationsareavailableon

request.

Thisoperatingmanualshouldbereadcarefullybeforeinstallation

andstart-upofthesubstation.Themanufactureracceptsno

liabilityfordamageorfaultsthatresultfromnon-compliancewith

theoperatingmanual.Pleasereadandfollowalltheinstructions

carefullytopreventaccidents,injuryanddamagetoproperty.

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

Pleasecomplywiththeinstructionsissuedbythesystem

manufacturerorsystemoperator.

Corrosionprotection

Allpipesandcomponentsaremadeofstainlesssteelandbrass.

Themaximumchloridecompoundsoftheowmediumshouldnot

behigherthan150mg/l.

Theriskofequipmentcorrosionincreasesconsiderablyifthe

recommendedlevelofpermissiblechloridecompoundsis

exceeded.

Energysource

Thesubstationisdesignedfordistrictheatingastheprimary

sourceofenergy.However,alsootherenergysourcescanbeused

wheretheoperatingconditionsallowitandalwaysarecomparable

todistrictheating.

Application

Thesubstationisdesignedtobeconnectedtothehouse

installationinafrost-freeroom,wherethetemperaturedoesnot

exceed50°Candthehumiditydoesnotexceed60%.Donotcover

orwallupthesubstationorinanyotherwayblocktheentrance

tothestation.

Choiceofmaterial

Choiceofmaterialsalwaysincompliancewithlocallegislation.

Safetyvalve(s)

Werecommendmountingofsafetyvalve(s),however,alwaysin

compliancewithlocalregulations.

Connection

Thesubstationmustbeequippedwithfeaturesthatensurethat

thesubstationcanbeseparatedfromallenergysources(also

powersupply).

Emergency

Incaseofdangeroraccidents-re,leaksorotherdangerous

circumstances-interruptallenergysourcestothestationif

possible,andseekexperthelp.

Incaseofdiscolouredorbad-smellingdomestichotwater,closeall

shut-offvalvesonthesubstation,informtheoperatingpersonnel

andcallforexperthelpimmediately.

Storage

Anystorageofthesubstationwhichmaybenecessarypriorto

installationshouldbeinconditionswhicharedryandheated.

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

Pleaseobserveinstructionscarefully

Toavoidinjurytopersonsanddamagetothedevice,itisabsolutely

necessarytoreadandobservetheseinstructionscarefully.

Warningofhighpressureandtemperature

Beawareoftheinstallation’spermissiblesystempressureand

temperature.

Themaximumtemperatureoftheowmediuminthesubstationis

120°C.

Themaximumoperatingpressureofthesubstationis10bar.PN16

versionsareavailableonenquiry.

Theriskofpersonsbeinginjuredandequipmentdamagedincreases

considerablyiftherecommendedpermissibleoperatingparameters

areexceeded.

Thesubstationinstallationmustbeequippedwithsafetyvalves,

however,alwaysinaccordancewithlocalregulations.

Warningofhotsurface

Thesubstationhasgothotsurfaces,whichcancauseskinburns.

Pleasebeextremelycautiousincloseproximitytothesubstation.

Powerfailurecanresultinthemotorvalvesbeingstuckinopen

position.Thesurfacesofthesubstationcangethot,whichcancause

skinburns.Theballvalvesondistrictheatingsupplyandreturnshould

beclosed.

Warningoftransportdamage

Beforesubstationinstallation,pleasemakesurethatthesubstation

hasnotbeendamagedduringtransport.

IMPORTANT-Tighteningofconnections

Duetovibrationsduringtransportallangeconnections,screwjoints

andelectricalclampandscrewconnectionsmustbecheckedand

tightenedbeforewaterisaddedtothesystem.Afterwaterhasbeen

addedtothesystemandthesystemhasbeenputintooperation,

re-tightenALLconnections.

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4.0Mounting

4.1Mounting

Installationmustbeincompliancewithlocalstandardsand

regulations.

Districtheating(DH)-Inthefollowingsections,DHreferstothe

heatsourcewhichsuppliesthesubstations.Avarietyofenergy

sources,suchasoil,gasorsolarpower,couldbeusedasthe

primarysupplytoDanfosssubstations.Forthesakeofsimplicity,

DHcanbetakentomeantheprimarysupply.

Connections:

1.Districtheating(DH)supply

2.Districtheating(DH)return

3.Heating(HE)supply

4.Heating(HE)return

5.Domestichotwater(DHW)

6.Domesticcoldwater(DCW)

Connectionsizes:

DH+HE:

G¾”(int.thread)

DCW+DHW:

G¾”(int.thread)

Dimensions(mm):

Withinsulation:

H610xW540xD345

Weight(approx.):15kg

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

Thepipeplacementcandeviatefromtheshowndrawing.Pleasenote

themarkingsonthestation.

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4.1.1Installation

Mounting:

Adequatespace

Pleaseallowadequatespacearoundthesubstationformounting

andmaintenancepurposes.

Orientation

Thestationmustbemountedsothatcomponents,keyholes

andlabelsareplacedcorrectly.Ifyouwishtomountthestation

differentlypleasecontactyoursupplier.

Drillings

Wheresubstationsaretobewall-mounted,drillingsareprovided

inthebackmountingplate.Floormountedunitshavesupport.

Labelling

Eachconnectiononthesubstationislabelled.

Beforeinstallation:

Cleanandrinse

Priortoinstallation,allsubstationpipesandconnectionsshouldbe

cleanedandrinsed.

Thightening

Duetovibrationduringtransport,allsubstationconnectionsmust

becheckedandtightenedbeforeinstallation.

Unusedconnections

Unusedconnectionsandshut-offvalvesmustbesealedwitha

plug.Shouldtheplugsrequireremoval,thismustonlybedoneby

anauthorizedservicetechnician.

Installation:

Strainer

Ifastrainerissuppliedwiththestationitmustbettedaccording

toschematicdiagram.Pleasenotethatthestrainermaybe

suppliedloose.

Connections

Internalinstallationanddistrictheatingpipesconnectionsmustbe

madeusingthreaded,angedorweldedconnections.

Keyholeformounting.

4.2Start-up

Start-up,Directheating

Theshut-offvalvesshouldbeopenedandtheunitobservedas

itentersservice.Visualcheckingshouldconrmtemperatures,

pressures,acceptablethermalexpansionandabsenceofleakage.

Iftheheatexchangeroperatesinaccordancewithdesign,itcanbe

puttoregularuse.

Afterwaterhasbeenaddedtothesystemandthesystemhasbeen

putintooperation,re-tightenALLconnections.

Re-thightenconnections

Afterwaterhasbeenaddedtothesystemandthesystemhasbeen

putintooperation,re-tightenALLconnections.

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5.0Design

5.1Design

Yoursubstationmightlookdifferentthanthesubstationshown.

Designdescription

Heatexchanger,DHW

Differentialpressurecontroller

Circulationconnection

Fittingpiece,energymeter

Strainer

Sieve

Sensorpocket,energymeter

IHPTcontroller,DHW

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5.2Schematicdiagram

DHW

DCW

Supply

Return

Yoursubstationmightlookdifferentthantheschematicdiagramshown.

Schematicdescription

Heatexchanger,DHW

Sensorpocket,heatmeter

Fittingpiece,energymeter

Ballvalve

Differentialpressurecontroller

Sieve

Strainer

Connectionclosed

IHPTcontroller

DHW:DomesticHotWater

DCW:

DomesticColdWater

DHSupply:DistrictHeatingSupply

DHReturn:DistrictHeatingReturn

HESupply:HeatingSupply

HEReturn:HeatingReturn

5.2.1Technicalparameters

Technicalparameters

Nominalpressure:PN10(PN16versionsareavailableonenquiry)

Max.DHsupplytemperature:

120°C

Min.DCWstaticpressure:

1.0bar

Brazingmaterial(HEX):

Copper

Heatexchangerstestpressure:30bar

Soundlevel:≤55dB

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6.0Controls

6.1Heatingcircuit

6.1.1Differentialpressurecontroller

Thedifferentialpressurecontrollersmoothsouttheuctuationsin

pressurearrivingfromthedistrictheatingnetwork.Theoperating

pressureinthesubstationisthusheldsteady.

6.2DHWtemperaturecontrol

DHWtemperaturecontrol

TherearevarioustypesofDHWtemperaturecontrolusedin

Danfosssubstations.

DHWtemperatureshouldbeadjustedto45-50°C,asthisprovides

optimalutilisationofDHwater.AtDHWtemperaturesabove55°C,

thepossibilityoflimescaledepositsincreasessignicantly.

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6.2.1IHPT90controller(45–65°)

IHPTisaself-actingow-compensatedtemperaturecontrollerwith

integrateddifferentialpressurecontroller.

TheIHPToperatesatitsbestatDHsupplytemperaturesofupto

100°C.

Byturningthehandlefortemperaturesettingin(+)direction

thesettingisincreased,byturningitin(-)directionthesettingis

decreased.

Turns*DHWTemperatureSetting[°C]

064

258

*Startposition:Handleturnedfullyin(+)direction.

Thevaluesareintendedasaguide.

6.3Other

6.3.1Safetyvalve

Thepurposeofthesafetyvalveistoprotectthesubstationfrom

excessivepressure.

Theblow-offpipefromthesafetyvalvemustnotbeclosed.The

blow-offpipeoutletshouldbeplacedsothatitdischargesfreely

anditispossibletoobserveanydrippingfromthesafetyvalve.

Itisrecommendedtochecktheoperationofsafetyvalvesat

intervalsof6months.Thisisdonebyturningthevalveheadin

directionindicated.

6.3.2Strainer

Strainersshouldbecleanedregularlybyauthorizedpersonnel.The

frequencyofcleaningwoulddependonoperatingconditionsand

themanufacturer’sinstructions.

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6.3.3GTUPressureEqualizer

TheGTUPressureEqualizerabsorbstheexpansiononthe

secondarysideoftheTermixwaterheatersandcanbeusedasa

substitutetothesafetyvalve.

Furthermorethepressureequalizerabsorbsapossibleincreasein

pressure,soadischargeoutletisomitted.

TheGTUPressureEqualizermaynotbeappliedinsystemswithhot

watercirculation.

6.3.4Fittingpiece

Thesubstationisequippedwithattingpieceforenergymeter.

Assemblyofenergymeters:

1:Closeballvalves

ClosetheballvalvesonDHSupplyandDHReturn,ifthereiswater

onthesystem.

2:Loosennuts

Loosenthenutsonthettingpiece.

3:Removettingpiece

Removethettingpieceandreplaceitwiththeenergymeter.Do

notforgetthegaskets.

4:Tightenconnections

Aftermountingoftheenergymeterremembertocheckand

tightenallthreadedconnections.

Sensorpocket,energymeter

Thesensorsoftheenergymeterismountedinthesensorpockets.

6.4Extras

6.4.1Circulationpipe

Thecirculationpipesetismounteddirectlyonthecontroller.

Thesetincludescirculationpipe,singlecheckvalveandtting.

Whenmountingthehotwatercirculationdirectlyonthecontroller

thehotwatercirculationtemperaturewillbeequaltotheidle

temperature.Theidletemperatureisafewdegreeslowerthanthe

setdomestichotwatertemperature.

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6.5Mountingplateforenergymeterdisplay

Bracketforthedisplayoftheenergymeterdeliveredloosewith

theDistrictHeatingsubstation.

Mountthewallclipforthedisplayontothebracket.

Fixthebracketontothepipeclipsusingapairofpliers.

Slidethedisplayoftheenergymeterontheclip.

ThedisplayisnowneatlypositionedbelowtheDistrictHeating

substation.

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6.6Maintenance

Thesubstationrequireslittlemonitoring,apartfromroutine

checks.Itisrecommendedtoreadtheenergymeteratregular

intervals,andtowritedownthemeterreadings.

RegularinspectionsofthesubstationaccordingtothisInstruction

arerecommended,whichshouldinclude:

Strainers

Cleaningofstrainers.

Meters

Checkingofalloperatingparameterssuchasmeterreadings.

Temperatures

Checkingofalltemperatures,suchasDHsupplytemperatureand

DHWtemperature.

Connections

Checkingallconnectionsforleakages.

Safetyvalves

Theoperationofthesafetyvalvesshouldbecheckedbyturning

thevalveheadintheindicateddirection.

Venting

Checkingthatthesystemisthoroughlyvented.

Inspectionsshouldbecarriedoutminimumeverytwoyears.

SparepartscanbeorderedfromDanfoss.Pleaseensurethatany

enquiryincludesthesubstationserialnumber.

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

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7.0Troubleshooting

7.1Troubleshootingingeneral

Intheeventofoperatingdisturbances,thefollowingbasicfeatures

shouldbecheckedbeforecarryingoutactualtroubleshooting:

•thesubstationisconnectedtoelectricity,

•thestrainerontheDHsupplypipeisclean,

•thesupplytemperatureoftheDHisatthenormallevel

(summer,atleast60°C-winter,atleast70°C),

•thedifferentialpressureisequaltoorhigherthanthenormal

(local)differentialpressureintheDHnetwork–ifindoubt,ask

theDHplantsupervisor,

•pressureonthesystem-checktheHEpressuregauge.

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

7.2TroubleshootingDHW

ProblemPossiblecauseSolution

Strainerinsupplyorreturnlineclogged.Cleanstrainer(s).

DHWcirculationpumpoutoforderorwith

toolowsetting.

Checkcirculationpump.

Defectiveorcloggednon-returnvalve.

Replace–clean.

Noelectricity.Check.

Wrongsettingofautomaticcontrols,ifany.Toadjustanelectroniccontrollerfor

DHW,pls.noteenclosedinstructionsfor

electroniccontroller.

Scalingoftheplateheatexchanger.

Replace–rinseout.

Defectivemotorizedvalve.Check(usemanualfunction)–replace.

Defectivetemperaturesensors.

Check–replace.

ToolittleornoDHW.

Defectivecontroller.

Check–replace.

DCWisbeingmixedwiththeDHW,e.g.in

adefectivethermostaticmixingvalve.

Check–replace. Hotwaterinsometapsbutnotinall.

Defectiveorcloggednon-returnvalveon

circulationvalve.

Replace–clean.

Taptemperaturetoohigh;DHWtapload

toohigh.

Thermostaticvalveadjustedtoatoohigh

level.

Check–set.

Scalingoftheplateheatexchanger.

Replace–rinseout. Temperaturedropduringtapping.

LargerDHWowthanthesubstationhas

beendesignedfor.

ReduceDHWow.

Thermostaticcontrolvalvedoesnotclose

TemperaturedifferencebetweenDH

supplyandDHWsetpointtoolow.

Lowerthesetpointtemperatureor

increasetheDHsupplytemperature.

Idletemperaturetoolow(forstations

equippedwithIHPT).

Setpointtoolow.Turnthermostatin(+)direction.

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7.3TroubleshootingHE

ProblemPossiblecauseSolution

Toolittleornoheat.StrainercloggedinDHorHEcircuit

(radiatorcircuit).

Cleangate/strainer(s).

ThelterintheenergymeteronDHcircuit

clogged.

Cleanthelter(afterconsultingtheDH

plantoperator).

Defectiveorwronglyadjusteddifferential

pressurecontroller.

Checktheoperationofthedifferential

pressurecontroller–cleanthevalveseatif

required.

Sensordefective–orpossiblydirtinthe

valvehousing.

Checktheoperationofthethermostat–

cleanthevalveseatifrequired.

Automaticcontrols,ifany,wronglysetor

defective-possiblypowerfailure.

Checkifthesettingofthecontroller

iscorrect–seeseparateinstructions.

Checkthepowersupply.Temporary

settingofmotorto“manual”control–see

instructionsonautomaticcontrols.

Pumpoutofoperation.Checkifthepumpisreceivingpowerand

thatitturns.Checkifthereisairtrappedin

thepumphousing–seepumpmanual.

Thepumpissetattoolowspeedof

rotation.

Setthepumpathigherspeedofrotation.

Pressuredrop–thepressuredropon

theradiatorcircuitshowslowerthan

recommendedoperatingpressure.

Fillwateronthesystemandcheckthe

functioningofthepressureexpansion

vesselifrequired.

Airpocketsinthesystem.Venttheinstallationthoroughly.

Limitingofthereturntemperature

adjustedtoolow.

Adjustaccordingtoinstructions.

Defectiveradiatorvalves.

Check–replace.

Unevenheatdistributioninbuilding

becauseofincorrectlysetbalancingvalves,

orbecausetherearenobalancingvalves.

Adjust/installbalancingvalves.

Diameterofpipetosubstationtoosmallor

branchpipetoolong.

Checkpipedimensions.

Unevenheatdistribution.Airpocketsinthesystem.Venttheinstallationthoroughly.

DHsupplytemperaturetoohigh.

Wrongsettingofthermostatorof

automaticcontrols,ifany.

Adjustautomaticcontrols,–see

instructionsforautomaticcontrols.

Defectivecontroller.Thecontrollerdoes

notreactasitshouldaccordingtothe

instructions.

Callautomaticcontrolsmanufactureror

replacetheregulator.

Defectivesensoronself-actingthermostat.

Replacethermostat–orsensoronly.

DHsupplytemperaturetoolow.

Wrongsettingofautomaticcontrols,ifany.

Adjustautomaticcontrols–seeinstructions

forautomaticcontrols.

Defectivecontroller.Thecontrollerdoes

notreactasitshouldaccordingtothe

instructions.

Callinautomaticcontrolsmanufactureror

replacecontroller.

Defectivesensoronself-actingthermostat.

Replacethermostat–orsensoronly.

Wrongplacement/ttingofoutdoor

temperaturesensor.

Adjustlocationofoutdoortemperature

sensor.

Strainerclogged.Cleangate/strainer.

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ToohighDHreturntemperature.

Toosmallheatingsurface/toosmall

radiatorscomparedtothetotalheating

requirementofthebuilding.

Increasetotalheatingsurface.

Poorutilizationofexistingheatingsurface.

Defectivesensoronself-actingthermostat.

Makesuretheheatisdistributedevenly

acrossthefullheatingsurface–openall

radiatorsandkeeptheradiatorsinthe

systemfromheatingupatthebottom.It

isextremelyimportanttokeepthesupply

temperaturetotheradiatorsaslowas

possible,whilemaintainingareasonable

levelofcomfort.

Thesystemissinglepipeloop.

Thesystemshouldfeatureelectronic

controlsaswellasreturnsensors.

Pumppressuretoohigh.Adjustpumptoalowerlevel.

Airinsystem.

Ventthesystem.

Defectiveorincorrectlysetradiator

valve(s).Singlepipeloopsystemsrequire

specialone-piperadiatorvalves.

Check–set/replace.

Dirtinthemotorizedvalveorinthe

differentialpressurecontroller.

Check–cleanout.

Defectivemotorizedvalve,sensoror

automaticcontroller.

Check–replace.

Electroniccontrollernotadjustedcorrectly.Adjustaccordingtoinstructions.

Noiseinsystem.

Pumppressuretoohigh.Adjustpumptoalowerlevel.

Heatloadtoohigh.

Defectivemotorizedvalve,sensoror

electroniccontroller.

Check–replace.

7.4Disposal

Disposal

Thisproductshouldbedismantledanditscomponents

sorted,ifpossible,invariousgroupsbeforerecycling

ordisposal.

Alwaysfollowthelocaldisposalregulations.

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8.0Declaration

8.1Declarationofconformity

8.1.1Category0withoutelectricalequipment

EC–DeclarationofConformity

GeminaTermixA/S

MemberoftheDanfossGroup

Navervej15-17

DK-7451Sunds

Declaresonoursoleresponsibilitythatthebelowproducts:

Substations–Category0withoutelectricalequipment,

coveredbythisdeclarationareinconformitywiththefollowingdirectives,standardsandothernormative

documents,providedthattheyareusedaccordingtoourinstructions.

MachineryDirective2006/42/EC

DS/EN60204-1/A1:2009.Safetyofmachinery–

Part1–GeneralRequirements.

DS/EN12100:2011.Safetyofmachinery–Risk

assessment.

Sunds–2013.03.15

PlaceanddateofissueClausGjøderumMortensen

Quality&EnvironmentManager

VM.IE.C1.02/LUK40143

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InstallationGuideTermixVMTD-Iwithcompleteinsulation

Danfoss Termix VMTD-I Operating instructions

Danfoss Termix VMTD-I Operating instructions

Danfoss Termix VMTD-I Operating instructions

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