Danfoss Termix VVX C20 Operating instructions

Brand: Danfoss

Model: Termix VVX C20

Type: Operating instructions

Danfoss Termix VVX C20 is a compact substation for heating and hot water which offers an all-in-one solution for your home. It's designed for wall mounting and comes with many features that make it easy to use and maintain.

The Termix VVX C20 has a prefabricated district heating circuit with a differential pressure controller, thermometers, and ball valves. The heating circuit includes a plate heat exchanger, safety valve, pressure gauge, thermometers, ball valves, drain valve, air valve, expansion vessel, and circulation pump. Depending on your needs, different heat exchangers can be used.

For domestic hot water, the Termix VVX C20 uses a plate heat exchanger that provides efficient heat extraction with high output. The thermostatic control valve automatically maintains the comfort temperature of the hot water, even when the heating system is in reduced operation or if the district heating plant changes operating parameters.

InstallationGuide

TermixVVXCompact20

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......................................................23

8.1Declarationofconformity........................................23

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InstallationGuideTermixVVXCompact20

2.0Functionaldescription

Districtheatingsubstationforindirectheatingand

instantaneousdomestichotwaterwiththermostaticor

electroniccontrols.Designedforwall-mounting.

Application

TheTermixVVXCompact20substationisathecompletesolution

forhotwaterandspaceheatingwithoptimalsafety,efcient

energytransfer,service-friendlyconstructionandacompact

design.Thesubstationisapplicable,ifaheatexchangeris

requiredoronaconversiontodistrictheating,wheretheexisting

equipmentisunsuitablefordirectconnection.

Districtheating(DH)

Thedistrictheatingcircuitisprefabricatedwithadifferential

pressurecontrolleraswellasthermometersandballvalves.

Heating(HE)

Theheatingcircuitconsistsofaplateheatexchanger,safety

valve,manometer,thermometers,ballvalves,drainvalve,air

valve,expansionvesselandcirculationpump.Theheating

temperaturecanbecontrolledthermostaticallyorbyanelectronic

controllerwithanoutdoortemperaturesensor.Dependingonthe

application,differentheatexchangerscanbedimensioned.

Domestichotwater(DHW)

Thedomestichotwaterispreparedintheheatexchangerandthe

temperatureisregulatedwiththermostaticorelectroniccontrols.

TheefcientplateheatexchangerforDHWoffersexceptionally

goodheatextractionwithhighoutput.Noreadjustmentofthe

DHWtemperatureisrequiredafterinstallationandinitialsettingof

thecontrols.Thethermostaticcontrolvalveautomaticallyretains

thecomforttemperatureofthehotwater,evenwhentheheating

systemisinreducedoperationduringsummerorifthedistrict

heatingplantchangesoperatingparametersbetweensummerand

winter.Thiseitherbyloweringorincreasingtheowtemperature

ofthedistrictheatingwaterand/ortheoperatingpressureinthe

network.

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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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InstallationGuideTermixVVXCompact20

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)

7.Hotwatercirculation(HCW)

Connectionsizes:

DH+HE:

G1”(int.thread)

DCW+DHW:

G1”(int.thread)

HCW:

G¾”(int.thread)

Dimensions(mm):

Withoutcover:

H815xW505xD400

Withcover:

H815xW540xD430

Weight(approx.):30–40kg

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.

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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-thightenconnections

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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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.

Disconnection

Thesubstationmustbeelectricallyconnectedsothatitcanbe

disconnectedforrepairs.

Outdoortemperaturesensor

Outdoorsensorsshouldbemountedsoastoavoidexposureto

directsunlight.Theyshouldnotbeplacedclosetodoors,windows

orventilationoutlets.

Theoutdoorsensormustbeconnectedtothestationonthe

terminalblockundertheelectroniccontrol.

Authorizedelectrician

Electricalconnectionsmustbemadebyanauthorizedelectricianonly.

Localstandards

Electricalconnectionsmustbemadeinaccordancewithcurrent

regulationsandlocalstandards.

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5.0Design

5.1Design

Yoursubstationmightlookdifferentthanthesubstationshown.

Designdescription

Heatexchanger,HE

Thermostaticvalve

Actuator,HE

Heatexchanger,DHW

Circulationpump

Differentialpressurecontroller

Summervalve

Domestichotwaterpump

Airvent,manual

Safetyvalve

Filling/drainvalve

Pressuregauge

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5.2Schematicdiagram

Supply

Return

DHW

DCW

HWC

Yoursubstationmightlookdifferentthantheschematicdiagramshown.

Schematicdescription

Heatexchanger,HE

Strainer

Ballvalve

Heatexchanger,DHW

Circulationpump

Deliveredloosewithunit

Electroniccontroller

Domestichotwaterpump

Pressuregauge

Ballvalve

Outdoorsensor

Actuator

Singlecheckvalve

Thermometer

2-waymotorizedvalve

Safetyvalve

Surfacesensor

Differentialpressurecontroller

Thermostaticvalve

Filling/drainvalve

Airvent,manual

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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InstallationGuideTermixVVXCompact20

6.0Controls

6.1Heatingcircuit

6.1.1Differentialpressurecontroller

Thedifferentialpressurecontrollersmoothsouttheuctuationsin

pressurearrivingfromthedistrictheatingnetwork.Theoperating

pressureinthesubstationisthusheldsteady.

6.1.2RAVKcontroller

HEtemperaturecontrol

TheHEowtemperatureintheheatingcircuitiscontrolledbythe

HEtemperaturecontroller.

Thermostaticcontrol

ThetemperatureoftheHEowlineisadjustedasfollows:

Toincreasetemperature,turnthehandleonthethermostatic

controllertoselectahighernumber.

Todecreasetemperature,turnthehandleonthethermostatic

controllertoselectalowernumber.

RAVKcontroller(25-65°C).Thetemperaturesettingisasfollows:

1=25°C

2=35°C

3=45°C

4=55°C

5=65°C

Thevaluesareintendedasaguide.

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6.1.3Flowcontrollerwithintegratedcontrolvalve

Thecontrollerisaself-actingowcontrollerwithintegratedcontrol

valve.Thecontrollercloseswhensetmax.owisexceededand

canbeusedincombinationwithDanfosselectricalactuatorswith

orwithoutsafetyfunction.Springreturnmotorcanbeusedas

safetyfunctionbypowerfailure.

6.1.4Electric2–waymotorizedvalve

Actuatorswithorwithoutsafetyfunctionareavailablefor3-point

controls.Spring-returnactuatorscanbeusedtoprovidesafety

shut-offintheeventofpowerfailure.

6.1.5Electroniccontrol

Substationswithelectroniccontrolmustbesetinaccordancewith

manufacturer´sinstructions.

Wheretheroomtemperatureiscontrolledbyradiatorthermostats,

itisrecommendedthatthermostatsbesetforminimum

temperatureineachroom.

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InstallationGuideTermixVVXCompact20

6.1.6Outdoortemperaturesensor(ESMT)

Outdoorsensorsshouldbemountedsoastoavoidexposureto

directsunlight.Theyshouldnotbeplacedclosetodoors,windows

orventilationoutlets.

6.1.7Circulationpump

ALPHA2pumpshavebothvariablespeedpressurecontrolled

operation,andstandardselectablethreespeedoperation.

TheuniqueAUTOADAPTfeatureallowsthepumptomatchits

performancetothesystemrequirements,helpingtoreducenoise

whenthermostaticvalvesareclosingdown.

EnergylabellingclassA

ALPHA2Lpumpshavebothvariablespeedpressurecontrolled

operation,andstandardselectablethreespeedoperation.The

variablespeedmodulatingmodesallowthepumptomatchits

performancetothesystemrequirements,helpingtoreducenoise

whenthermostaticvalvesareclosingdown.

EnergylabellingclassA

UPSpumpsareacompleterangeofcirculatorpumpswith3

speeds.

EnergylabellinguptoclassB

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6.1.8HEpressuregauge

TheHEpressuregaugeindicatesthepressureoftheHEsystem.

6.2DHWtemperaturecontrol

DHWtemperaturecontrol

TherearevarioustypesofDHWtemperaturecontrolusedin

Danfosssubstations.

DHWtemperatureshouldbeadjustedto45-50°C,asthisprovides

optimalutilisationofDHwater.AtDHWtemperaturesabove55°C,

thepossibilityoflimescaledepositsincreasessignicantly.

6.2.1AVTBcontroller(20–60°)

Thetemperaturesettingisasfollows:

1=20°C

2=35°C

3=50°C

4=60°C

5=70°C

Thevaluesareintendedasaguide.

TheAVTBoperatesatitsbestatDHsupplytemperaturesofupto

90°C.

Thermostaticcontrol

DHWtemperatureisadjustedasfollows:

Toincreasetemperature,turnthehandleonthethermostatic

controllertoselectahighernumber.

Todecreasetemperature,turnthehandleonthethermostatic

controllertoselectalowernumber.

6.2.2Flowcontrollerwithintegratedcontrolvalve

Thecontrollerisaself-actingowcontrollerwithintegratedcontrol

valve.Thecontrollercloseswhensetmax.owisexceededand

canbeusedincombinationwithDanfosselectricalactuatorswith

orwithoutsafetyfunction.Springreturnmotorcanbeusedas

safetyfunctionbypowerfailure.

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InstallationGuideTermixVVXCompact20

6.2.3Electric2–waymotorizedvalve

Actuatorswithorwithoutsafetyfunctionareavailablefor3-point

controls.Spring-returnactuatorscanbeusedtoprovidesafety

shut-offintheeventofpowerfailure.

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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6.3.3Fittingpiece

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.

6.3.4Domestichotwaterpump

Important!

Itisnecessarytomountadomestichotwatercirculationpumpon

thewaterheatertoavoidregulationproblems.

Thecirculationpumpcannotbeswitchedoff,sincethiswillresult

inregulationproblems.(noowatthesensor).

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InstallationGuideTermixVVXCompact20

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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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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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.CW.R2.02/LUK41400

DanfossDistrictEnergy

InstallationGuideTermixVVXCompact20

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.CW.R2.02/LUK41400

DEN-GT

InstallationGuideTermixVVXCompact20

DEN-GT

VI.CW.R2.02/LUK41400

DanfossDistrictEnergy

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Danfoss Termix VVX C20 Operating instructions

Danfoss Termix VVX C20 Operating instructions

Danfoss Termix VVX C20 Operating instructions

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