Danfoss Termix VMTD-F MIX-I Operating instructions

Brand: Danfoss

Model: Termix VMTD-F MIX-I

Type: Operating instructions

Danfoss Termix VMTD-F MIX-I is a district heating substation for direct heating and instantaneous domestic hot water with thermostatic control. It is designed for wall-mounting and is applicable for single-family houses and for decentralized systems in multi-family houses. The substation is prefabricated with a differential pressure controller, fitting piece and sensor pocket for insertion of a heat meter as well as strainer and ball valves. Furthermore, the substation is delivered with a mixing loop including pump, controls, and non-return valve.

OperatingGuide

TermixVMTD-FMIX-I

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.................................................................13

6.4Extras................................................................15

6.5Maintenance........................................................15

7.0Troubleshooting..............................................16

7.1Troubleshootingingeneral......................................16

7.2TroubleshootingDHW............................................16

7.3TroubleshootingHE...............................................17

7.4Disposal.............................................................18

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

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

DanfossHeating

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OperatingGuideTermixVMTD-FMIX-I

2.0Functionaldescription

Districtheatingsubstationfordirectheatingand

instantaneousdomestichotwaterwiththermostaticcontrol.

Designedforwall-mounting.

Application

TheTermixVMTD-FMIX-Iisacompletesolutionwithbuilt-in

waterheaterandheatingsystemwithdifferentialpressurecontrol

andmixingloop.TheTermixVMTD-FMIX-Iisapplicableforfor

single-familyhousesandfordecentralizedsystemsinmulti-family

houses.

Districtheating(DH)

Thesubstationisprefabricatedwithadifferentialpressure

controller,ttingpieceandsensorpocketforinsertionofa

heatmeteraswellasstrainerandballvalves.Furthermorethe

substationisdeliveredwithamixingloopincludingpump,controls

andnon-returnvalve.

Heating(HE)

Theheatingcircuitisdesignedfordirectconnection.The

differentialpressurecontrollersetstheoptimumoperation

conditionsforradiatorthermostatsinordertoenableindividual

temperaturecontrolineachroom.Themixingloopcreatesa

suitabletemperaturelevele.g.foroorheating.Inordertoenable

atimedependenttemperaturecontrolprogram,azonevalvewith

actuatorandaroomthermostatcanbeincludedasanoption.

Domestichotwater(DHW)

Thedomestichotwaterispreparedintheheatexchangerand

theheatexchangerandthetemperatureisregulatedwithaow

compensatedtemperaturecontrollerwithintegrateddifferential

pressurecontroller.TheheatexchangercoolsouttheDHwater

veryefciently,therebycreatinganexcellentoperatingeconomy.

TheDanfossIHPTvalveensuresastablehotwatertemperature

byvaryingloads,supplytemperaturesandbyhighandvarying

differentialpressurewithouttheneedforreadjustingthevalve.

Thisprotectstheheatexchangeragainstoverheatingandlime

scaleformation.FurthermoretheIHPTvalvehasanintegrated

idletemperaturecontroller,whichkeepsthehousesupplyline

warm.Thisshortensthewaitingperiodsduringsummerwhen

theheatingsystemisinreducedoperation,whichisidealwhere

highcomfortisrequested.

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OperatingGuideTermixVMTD-FMIX-I

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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OperatingGuideTermixVMTD-FMIX-I

4.0Mounting

4.1Mounting

Installationmustbeincompliancewithlocalstandardsand

regulations.

Districtheating(DH)-Inthefollowingsections,DHreferstothe

heatsourcewhichsuppliesthesubstations.Avarietyofenergy

sources,suchasoil,gasorsolarpower,couldbeusedasthe

primarysupplytoDanfosssubstations.Forthesakeofsimplicity,

DHcanbetakentomeantheprimarysupply.

Connections:

1.Optionalhotwatercirculation(HWC)

2.Districtheating(DH)supply

3.Districtheating(DH)return

4.Coldwatermains(CWM)

5.Domesticcoldwater(DCW)

6.Domestichotwater(DHW)

7.Heating(HE)supply

8.Heating(HE)return

Connectionsizes:

DH+HE:

G¾”(int.thread)

CWM+DCW+DHW:

G¾”(int.thread)

Dimensions(mm):

Withoutcover:

H770xW535xD150

Withcover:

H800xW540xD242

Weight(approx.):25kg

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.

Tightening

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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OperatingGuideTermixVMTD-FMIX-I

4.2Start-up

Start-up,Heatingwithmixingloop

Start-up:

1:Pumpspeed

Setthepumptohighestspeedbeforestart-up.

2:Startpump

Startthepumpandheatthroughthesystem.

3:Openshut-offvalves

Theshut-offvalvesshouldthenbeopenedandtheunitobserved

asitentersservice.Visualcheckingshouldconrmtemperatures,

pressures,acceptablethermalexpansionandabsenceofleakage.

Ifthesystemoperatesinaccordancewithdesign,itcanbeput

toregularuse.

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.

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).

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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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OperatingGuideTermixVMTD-FMIX-I

5.0Design

5.1Design

Yoursubstationmightlookdifferentthanthesubstationshown.

Designdescription

Heatexchanger,DHW

Sensorpocket,energymeter

Circulationconnection

Differentialpressurecontroller

Singlecheckvalve

41A

Fittingpiece,coldwatermains

Thermostaticcontroller,HE

41BFittingpiece,energymeter

Strainer

Sieve

Circulatorpump

IHPTcontroller,DHW

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5.2Schematicdiagram

DHW

DCW

CWM

Supply

Return

Yoursubstationmightlookdifferentthantheschematicdiagramshown.

Schematicdescription

Heatexchanger,DHW

Circulatorpump

Connectionclosed

Singlecheckvalve

Sensorpocket,energymeter

41A

Fittingpiece,coldwatermains

Thermostaticvalve

Thermometer

41BFittingpiece,energymeter

Strainer

Differentialpressurecontroller

Sieve

IHPTcontroller

DHW:DomesticHotWater

DCW:

DomesticColdWater

CWM:

ColdWaterMains

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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OperatingGuideTermixVMTD-FMIX-I

6.0Controls

6.1Heatingcircuit

6.1.1Differentialpressurecontroller

Thedifferentialpressurecontrollersmoothsouttheuctuationsin

pressurearrivingfromthedistrictheatingnetwork.Theoperating

pressureinthesubstationisthusheldsteady.

6.1.2HEtemperaturecontrol

TheHEowtemperatureintheheatingcircuitiscontrolledbythe

HEtemperaturecontroller.

6.1.3RAVKcontroller

RAVKcontroller(25-65°C).Thetemperaturesettingisasfollows:

1=25°C

2=35°C

3=45°C

4=55°C

5=65°C

Thevaluesareintendedasaguide.

Thermostaticcontrol

ThetemperatureoftheHEowlineisadjustedasfollows:

Toincreasetemperature,turnthehandleonthethermostatic

controllertoselectahighernumber.

Todecreasetemperature,turnthehandleonthethermostatic

controllertoselectalowernumber.

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6.1.4TP7000

TP7000electronic7dayprogrammableroomthermostat.

Signalsfromtheroomthermostatcanbeusedtocontrolzone

valves.

6.1.5CirculatorpumpUPM3

UPM3Pumpscanbecontrolledinconstantpressure,proportional

pressureorconstantspeedmodedenedbythemeansofasmart

userinterface.

Thevariablespeedmodulatingmodesallowthepumptomatchits

performancetothesystemrequirements,helpingtoreducenoise

whenthermostaticvalvesareclosingdown.

EnergylabellingclassA

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6.1.6GrundfosUPM3AUTOLinstructions

Controlmode

Youcanswitchfromtheperformanceviewtothesettingsviewbypressingthepushbutton.Thesettingsviewshowswhichmode

controlsthecirculator.After2seconds,thedisplayswitchesbacktoperformanceview.

Ifyoupressthebuttonfor2to10seconds,theuserinterfaceswitchesto"settingselection"iftheuserinterfaceisunlocked.Youcan

changethesettingsastheyappear.Theselectionofthecontrolmodedependsonthesystemtypeandtheallocationofpressurelosses.

Ifyoupressthekeylockformorethan10seconds,youcantogglebetweenenabling/disablingthekeylockfunction.

Function

Recommendedfor

Green

YellowYellowYellowYellow

Proportionalpressure1

1-pipesystems

µµ

Proportionalpressure2

µµµ

Proportionalpressure3

2-pipesystems

µµµµ

Constantpressure1

Underoorheating

µµ

Constantpressure2

µµµ

Constantpressure3

µµµµ

ConstantCurve1

µµµ

ConstantCurve2

µµµµ

ConstantCurve3

µµµµµ

ConstantCurveMax.

µµµµ

Operationstatus

Function

Recommendedfor

Green

YellowYellowYellowYellow

Standby**OnlyPWMcontrolled

0%≤P1≤25%

µµ

25%≤P1≤50%

µµµ

50%≤P1≤75%

µµµµ

75%≤P1≤100%

µµµµµ

Alarmstatus

Function

Recommendedfor

RedYellowYellowYellowYellow

Blocked

µµ

Supplyvoltagelow

µµ

Electricalerror

µµ

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6.2DHWtemperaturecontrol

DHWtemperaturecontrol

TherearevarioustypesofDHWtemperaturecontrolusedin

Danfosssubstations.

DHWtemperatureshouldbeadjustedto45-50°C,asthisprovides

optimalutilisationofDHwater.AtDHWtemperaturesabove55°C,

thepossibilityoflimescaledepositsincreasessignicantly.

6.2.1IHPT180controller(45–65°)

IHPTisaself-actingow-compensatedtemperaturecontrollerwith

integrateddifferentialpressurecontroller.

TheIHPToperatesatitsbestatDHsupplytemperaturesofupto

100°C.

Byturningthehandlefortemperaturesettingin(+)direction

thesettingisincreased,byturningitin(-)directionthesettingis

decreased.

Turns*

Scale

DHWTemperatureSetting[°C]

661

455

352

248

144

043

*Startposition:Handleturnedfullyin(+)direction.

Thevaluesareintendedasaguide.

6.3Other

6.3.1Safetyvalve

Thepurposeofthesafetyvalveistoprotectthesubstationfrom

excessivepressure.

Theblow-offpipefromthesafetyvalvemustnotbeclosed.The

blow-offpipeoutletshouldbeplacedsothatitdischargesfreely

anditispossibletoobserveanydrippingfromthesafetyvalve.

Itisrecommendedtochecktheoperationofsafetyvalvesat

intervalsof6months.Thisisdonebyturningthevalveheadin

directionindicated.

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6.3.2Strainer

Strainersshouldbecleanedregularlybyauthorizedpersonnel.The

frequencyofcleaningwoulddependonoperatingconditionsand

themanufacturer’sinstructions.

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.

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6.4Extras

6.4.1Circulationpipe

Thecirculationpipesetismounteddirectlyonthecontroller.

Thesetincludescirculationpipe,singlecheckvalveandtting.

Whenmountingthehotwatercirculationdirectlyonthecontroller

thehotwatercirculationtemperaturewillbeequaltotheidle

temperature.Theidletemperatureisafewdegreeslowerthanthe

setdomestichotwatertemperature.

6.5Maintenance

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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OperatingGuideTermixVMTD-FMIX-I

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.

DanfossHeating

VI.GP .W4.02/LUK40250

DEN-GT

OperatingGuideTermixVMTD-FMIX-I

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.

DEN-GT

VI.GP .W4.02/LUK40250

DanfossHeating

OperatingGuideTermixVMTD-FMIX-I

8.0Declaration

8.1Declarationofconformity

Category0withelectricalequipment

DanfossHeating

VI.GP .W4.02/LUK40250

DEN-GT

OperatingGuideTermixVMTD-FMIX-I

Danfoss Termix VMTD-F MIX-I Operating instructions

Danfoss Termix VMTD-F MIX-I Operating instructions

Danfoss Termix VMTD-F MIX-I Operating instructions

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