Danfoss Termix VMTD Compact 20, VMTD-C20 Installation Manual

InstallationGuide

TermixVMTDCompact20

1.0TableofContents

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

........................................................................2

2.0VMTD-C20Functionaldescription.....................3

3.0Safetynotes.....................................................4

SafetyNotes—general...........................................4

4.0Mounting........................................................5

4.1Mounting...........................................................5

4.2Start-up..............................................................7

4.3Electricalconnections.............................................8

5.0Design.............................................................9

5.1Design...............................................................9

5.2Schematicdiagram................................................10

6.0Controls..........................................................12

6.1Heatingcircuit......................................................12

6.2DHWtemperaturecontrol........................................14

6.3Other.................................................................15

6.4Maintenance........................................................17

7.0Troubleshooting..............................................18

7.1Troubleshootingingeneral......................................18

7.2TroubleshootingDHW............................................18

7.3TroubleshootingHE...............................................19

7.4Disposal.............................................................20

8.0Declaration......................................................23

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

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InstallationGuideTermixVMTDCompact20

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InstallationGuideTermixVMTDCompact20

2.0VMTD-C20Functionaldescription

Districtheatingsubstationfordirectheatingand
instantaneousdomestichotwaterwiththermostaticor
electroniccontrols.Designedforwall-mounting.

Application

TheTermixVMTDCompact20substationisacompletesolution
withbuilt-inwaterheaterandheatingcircuitwithdifferential
pressurecontrols.Thesubstationisapplicableformulti-family
housesandapartmentbuildings.

Districtheating(DH)

Thedistrictheatingcircuitisprefabricatedwithadifferential
pressurecontrolleraswellasthermometersandballvalves.
Furthermorethesubstationisdeliveredwithamixingloop
includingpump,controlsandnon-returnvalve.

Heating(HE)

Theheatingcircuitisdesignedfordirectconnection.The
differentialpressurecontrollersetstheoptimumoperation
conditionsforradiatorthermostatsinordertoenableindividual
temperaturecontrolineachroom.Themixingloopcreatesa
suitabletemperaturelevelfortheheatingsystem.

Domestichotwater(DHW)

Thedomestichotwaterispreparedintheplateheatexchanger
andthetemperatureisregulatedwithathermostaticor
electro-niccontroller.TheefcientheatexchangerforDHW
offersexceptionallygoodheatextractionwithhighoutput.No
readjustmentoftheDHWtemperatureisrequiredafterinstallation
andinitialsettingofthecontrols.Thethermostaticcontrol
valveautomaticallyretainsthecomforttemperatureofthehot
water,evenwhentheheatingsystemisinreducedoperation
duringsummerorifthedistrictheatingplantchangesope-rating
parametersbetweensummerandwinter .Thiseitherbylowering
orincreasingtheowtemperatureofthedistrictheatingwater
and/ortheoperatingpressureinthenetwork.

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InstallationGuideTermixVMTDCompact20

3.0Safetynotes

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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InstallationGuideTermixVMTDCompact20

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(HWC)

Connectionsizes:

DH+HE:

G1”(int.thread)

DCW+DHW:

G1”(int.thread)

HWC:

G¾”(int.thread)

Dimensions(mm):

Withoutcover:
H815xW505xD300
Withcover:
H815xW540xD360

Weight(approx.):30–40kg

Authorizedpersonnelonly

Assembly,start-upandmaintenanceworkmustbeperformedby
qualiedandauthorizedpersonnelonly.

Thepipeplacementcandeviatefromtheshowndrawing.Pleasenote
themarkingsonthestation.

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InstallationGuideTermixVMTDCompact20

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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InstallationGuideTermixVMTDCompact20

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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InstallationGuideTermixVMTDCompact20

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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