Danfoss Termix VVX Compact 28 - 40 Operating instructions

Brand: Danfoss

Model: Termix VVX Compact 28 - 40

Type: Operating instructions

Danfoss Termix VVX Compact 28 - 40 is a complete solution for hot water and space heating with optimal safety, efficient energy transfer, service-friendly construction, and a compact design. It's applicable if a heat exchanger is required or on a conversion to district heating, where the existing equipment is unsuitable for direct connection. The substation is designed to be connected to the house installation in a frost-free room.

OperatingGuide

TermixVVXCompact28-40

1.0TableofContents

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

2.0Functionaldescription......................................2

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

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

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

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

4.2Start-up..............................................................6

4.3Electricalconnections.............................................7

5.0Design.............................................................8

5.1Design...............................................................8

5.2Schematicdiagram................................................9

6.0Controls..........................................................10

6.1Heatingcircuit......................................................10

6.2DHWtemperaturecontrol........................................13

6.3Other.................................................................14

6.4Maintenance........................................................16

7.0Troubleshooting..............................................17

7.1Troubleshootingingeneral......................................17

7.2TroubleshootingDHW............................................17

7.3TroubleshootingHE...............................................18

7.4Disposal.............................................................19

8.0Declaration......................................................22

8.1Declarationofconformity........................................22

DanfossDistrictEnergy

VI.GP .G3.02/LUK43460

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OperatingGuideTermixVVXCompact28-40

2.0Functionaldescription

Districtheatingsubstationforindirectheatingand

instantaneousdomestichotwater.

Application

TheTermixVVXCompact28-40isacompletesolutionforhot

waterandspaceheatingwithoptimalsafety,efcientenergy

transfer,service-friendlyconstructionandacompactdesign.The

substationisapplicable,ifaheatexchangerisrequiredorona

conversiontodistrictheating,wheretheexistingequipmentis

unsuitablefordirectconnection.

Districtheating(DH)

Thedistrictheatingcircuitisprefabricatedwithaowcontroller

withintegratedcontrolvalveaswellasthermometersandball

valves.

Heating(HE)

Theheatingcircuitconsistsofaplateheatexchanger,safetyvalve,

manometer,thermometers,ballvalves,drainvalve,airvalveand

circulationpumpandcanbecontrolledthermostaticallyorby

anelectroniccontrollerwithanoutdoortemperaturesensor.

Dependingontheapplication,differentheatexchangerscanbe

dimensioned.

Domestichotwater(DHW)

Thedomestichotwaterispreparedintheheatexchangerand

thetemperatureisregulatedwiththermostaticorelectronic

controls.Theefcientheatexchangeroffersexceptionallygood

heatextractionwithhighoutput.NoreadjustmentoftheDHW

temperatureisrequiredafterinstallationandinitialsettingofthe

controls.Thethermostaticcontrolvalveautomaticallyretainsthe

comforttemperatureofthehotwater,evenwhentheheating

systemisinreducedoperationduringsummerorifthedistrict

heatingplantchangesoperatingparametersbetweensummerand

winter,eitherbyloweringorincreasingtheowtemperatureofthe

districtheatingwaterand/ortheoperatingpressureinthenetwork.

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OperatingGuideTermixVVXCompact28-40

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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OperatingGuideTermixVVXCompact28-40

4.0Mounting

4.1Mounting

Installationmustbeincompliancewithlocalstandardsand

regulations.

Districtheating(DH)-Inthefollowingsections,DHreferstothe

heatsourcewhichsuppliesthesubstations.Avarietyofenergy

sources,suchasoil,gasorsolarpower,couldbeusedasthe

primarysupplytoDanfosssubstations.Forthesakeofsimplicity,

DHcanbetakentomeantheprimarysupply.

Connections:

1.Heating(HE)supply

2.Heating(HE)return

3.Districtheating(DH)supply

4.Districtheating(DH)return

5.Domestichotwater(DHW)

6.Domesticcoldwater(DCW)

7.Hotwatercirculation(HCW)

Dimensions(mm):H1011xW1856xD423

Weight(approx.):80kg

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby

qualiedandauthorizedpersonnelonly.

Thepipeplacementcandeviatefromtheshowndrawing.Pleasenote

themarkingsonthestation.

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OperatingGuideTermixVVXCompact28-40

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.

Mountingframe.

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OperatingGuideTermixVVXCompact28-40

4.2Start-up

Start-up,Indirectheating

Filling:

1:Firstll

Whencarryingoutrstll,theheatexchangermustbeslowlylled

withwateruntilitreachesworkingpressure.

2:Pressuregauge

TheHEpressuregaugeindicatesthepressureoftheHEsystem.This

instructionmustbefollowedstrictly,toavoiddangeroussituations.

3:Supplyhose

AballvalvewithplugisinstalledintheHEreturnline.Tollthe

system,theballvalvemustrstbeclosed,theplugremovedand

asupplyhoseconnected.Onre-openingtheballvalve,system

llcancommence.

4:Pre-pressure

Whenllingthesystemwithwater,thepressuregaugeshouldbe

observedclosely.Theexpansionvesselissuppliedpre-pressurised

to0.5bar.Thepre-pressurerequiredateachsubstationwill

dependonsystemhead(thedistancebetweenthelowestand

highestpointinthesystem),forexample:

5:Fillingstop

Fillingmuststopwhenthepressuregaugeshowsapressure

approximately1-2barhigherthanthepre-pressuresetting.The

ballvalveisthenclosed,thehoseremovedandtheplugputback

in.

Start-up:

1:Pumpspeed

Setthepumptohighestspeedbeforestart-up.

2:Startpump

Startthepumpandheatthroughthesystem.

3:Openshut-offvalves

Theshut-offvalvesshouldthenbeopenedandtheunitobserved

asitentersservice.Visualcheckingshouldconrmtemperatures,

pressures,acceptablethermalexpansionandabsenceofleakage.

Iftheheatexchangeroperatesinaccordancewithdesign,itcanbe

puttoregularuse.

4:Ventsystem

Switchoffthepumpandventtheinstallationaftertheradiators

havebeenwarmedup.

5:Adjustpumpspeed

Setthepumptothelowestspeedconsistentwithcomfortand

electricityconsumption.

Normallythechange-overswitchissetinthemidposition(default).

Howeverforsystemswithunderoorheatingorsinglepipeloop

systems,itmaybenecessarytoturnthechange-overswitch

upwards.

Higherpumpspeedsareonlyusediftheheatingrequirement

increases.

Re-tightenconnections

Afterwaterhasbeenaddedtothesystemandthesystemhasbeen

putintooperation,re-tightenALLconnections.

Pump

Thepumpmustbeswitchedoffduringsystemll.

Height(m)Pressure(bar)

0–50,5

5–101,0

10–15

1,5

15–202,0

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OperatingGuideTermixVVXCompact28-40

Underoorheating:

Pumpstopfunction

Ifthesubstationisusedinconnectionwithunderoorheating,the

circulationpumpmustbeconnectedtothepumpstopfunctionin

theunderoorheatingcontroller.Thepumpmustbestoppedif

allunderoorheatingcircuitsareclosed.

Warranty

Ifthisisnotpossible,thenowmustbecontinuedthroughthe

by-pass.Failingthis,thepumpwillbeatriskofseizureandany

remainingwarrantywillbewithdrawn.

Summeroperation:

Switchoffpump

Insummerthecirculationpumpmustbeswitchedoffandthe

shut-offvalvetoHEsupplyclosed.

Runningpumpbi-weekly

Itisrecommendedtostartupthecirculationpump(for2minutes)

onceamonthduringsummer;theshut-offvalveoftheHEsupply

mustbeshut.

Electroniccontroller

Mostelectroniccontrollerswillstartupthepumpautomatically

(pleasenotemanufacturer´sinstructions).

4.3Electricalconnections

Beforemakingelectricalconnections,pleasenotethe

following:

Safetynotes

Pleasereadtherelevantpartsofthesafetynotes.

230V

Thesubstationmustbeconnectedto230VACandearth.

Potentialbonding

Potentialbondingshouldbecarriedoutaccording

to60364-4-41:2007andIEC60364-5-54:2011.

Bondingpointonthemountingplatebelowrightcornermarked

withearthsymbol.

Disconnection

Thesubstationmustbeelectricallyconnectedsothatitcanbe

disconnectedforrepairs.

Outdoortemperaturesensor

Outdoorsensorsshouldbemountedsoastoavoidexposureto

directsunlight.Theyshouldnotbeplacedclosetodoors,windows

orventilationoutlets.

Theoutdoorsensormustbeconnectedtothestationonthe

terminalblockundertheelectroniccontrol.

Authorizedelectrician

Electricalconnectionsmustbemadebyanauthorizedelectricianonly.

Localstandards

Electricalconnectionsmustbemadeinaccordancewithcurrent

regulationsandlocalstandards.

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OperatingGuideTermixVVXCompact28-40

5.0Design

5.1Design

Yoursubstationmightlookdifferentthanthesubstationshown.

Designdescription

Heatexchanger,HE

Circulatorpump

27AActuator,HE

Heatexchanger,DHW

Domestichotwaterpump

27BActuator,DHW

Electroniccontroller

Filling/drainvalve

Flowcontrollerwithintegratedcontrolvalve

Singlecheckvalve

Pressuregaugewithballvalve

Airvent,manual

Safetyvalve

Pressuregauge

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OperatingGuideTermixVVXCompact28-40

5.2Schematicdiagram

Supply

Return

DHW

DCW

HWC

Yoursubstationmightlookdifferentthantheschematicdiagramshown.

Schematicdescription

Heatexchanger,HE

Circulatorpump

Pressuregaugewithballvalve

Heatexchanger,DHW

Domestichotwaterpump

Pressuregauge

Electroniccontroller

Outdoorsensor

Actuator

Ballvalve

Thermometer

Flowcontrollerwithintegratedcontrolvalve

Singlecheckvalve

Surfacesensor

Immersionsensor

Safetyvalve

Filling/drainvalve

Airvent,manual

Strainer

Deliveredloosewithunit

DHW:DomesticHotWater

DCW:

DomesticColdWater

HWC:

HotWaterCirculation

DHSupply:DistrictHeatingSupply

DHReturn:DistrictHeatingReturn

HESupply:HeatingSupply

HEReturn:HeatingReturn

5.2.1Technicalparameters

Technicalparameters

Nominalpressure:

PN16

Max.DHsupplytemperature:

120°C

Min.DCWstaticpressure:

0.5bar

Brazingmaterial(HEX):

Copper

Heatexchangerstestpressure:30bar

Soundlevel:≤55dB

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OperatingGuideTermixVVXCompact28-40

6.0Controls

6.1Heatingcircuit

6.1.1Flowcontrollerwithintegratedcontrolvalve

Thecontrollerisaself-actingowcontrollerwithintegratedcontrol

valve.Thecontrollercloseswhensetmax.owisexceededand

canbeusedincombinationwithDanfosselectricalactuatorswith

orwithoutsafetyfunction.Springreturnmotorcanbeusedas

safetyfunctionbypowerfailure.

6.1.2Electric2–waymotorizedvalve

Actuatorswithorwithoutsafetyfunctionareavailablefor3-point

controls.Spring-returnactuatorscanbeusedtoprovidesafety

shut-offintheeventofpowerfailure.

6.1.3Electroniccontrol

Substationswithelectroniccontrolmustbesetinaccordancewith

manufacturer´sinstructions.

Wheretheroomtemperatureiscontrolledbyradiatorthermostats,

itisrecommendedthatthermostatsbesetforminimum

temperatureineachroom.

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OperatingGuideTermixVVXCompact28-40

6.1.4Outdoortemperaturesensor(ESMT)

Outdoorsensorsshouldbemountedsoastoavoidexposureto

directsunlight.Theyshouldnotbeplacedclosetodoors,windows

orventilationoutlets.

6.1.5Circulatorpump

TheUPML,UPMXLcirculatorpumpsaredesignedforcirculating

liquidsinheatingsystemswithvariableows,internallycontrolled

withthreeproportionalpressurecurvesandthreeconstant

pressure/powercurvestobeselectedviauserinterface.

EuP2015Ready.

TheMAGNA3circulatorpumpsaredesignedforcirculatingliquids

inheatingsystemswithvariableowswhereyouwanttooptimise

thesettingofthepumpdutypoint,thusreducingenergycosts.

EuP2015Ready.

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OperatingGuideTermixVVXCompact28-40

6.1.6GrundfosUPML/UPMXLinstructions

PP=Proportionalpressure(fastash)

CP=Constantpressure(slowash)

6.1.7HEpressuregauge

TheHEpressuregaugeindicatesthepressureoftheHEsystem.

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OperatingGuideTermixVVXCompact28-40

6.2DHWtemperaturecontrol

DHWtemperaturecontrol

TherearevarioustypesofDHWtemperaturecontrolusedin

Danfosssubstations.

DHWtemperatureshouldbeadjustedto45-50°C,asthisprovides

optimalutilisationofDHwater.AtDHWtemperaturesabove55°C,

thepossibilityoflimescaledepositsincreasessignicantly.

6.2.1Flowcontrollerwithintegratedcontrolvalve

Thecontrollerisaself-actingowcontrollerwithintegratedcontrol

valve.Thecontrollercloseswhensetmax.owisexceededand

canbeusedincombinationwithDanfosselectricalactuatorswith

orwithoutsafetyfunction.Springreturnmotorcanbeusedas

safetyfunctionbypowerfailure.

6.2.2Electric2–waymotorizedvalve

Actuatorswithorwithoutsafetyfunctionareavailablefor3-point

controls.Spring-returnactuatorscanbeusedtoprovidesafety

shut-offintheeventofpowerfailure.

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OperatingGuideTermixVVXCompact28-40

6.2.3Domestichotwaterpump

Important!

Itisnecessarytomountadomestichotwatercirculationpumpon

thewaterheatertoavoidregulationproblems.

Thecirculationpumpcannotbeswitchedoff,sincethiswillresult

inregulationproblems.(noowatthesensor).

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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OperatingGuideTermixVVXCompact28-40

6.3.3Fittingpiece

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.

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OperatingGuideTermixVVXCompact28-40

6.4Maintenance

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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VI.GP .G3.02/LUK43460

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OperatingGuideTermixVVXCompact28-40

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.

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OperatingGuideTermixVVXCompact28-40

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.

DEN-GT

VI.GP .G3.02/LUK43460

DanfossDistrictEnergy

OperatingGuideTermixVVXCompact28-40

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.

DanfossDistrictEnergy

VI.GP .G3.02/LUK43460

DEN-GT

OperatingGuideTermixVVXCompact28-40

DEN-GT

VI.GP .G3.02/LUK43460

DanfossDistrictEnergy

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Danfoss Termix VVX Compact 28 - 40 Operating instructions

Danfoss Termix VVX Compact 28 - 40 Operating instructions

Danfoss Termix VVX Compact 28 - 40 Operating instructions

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