Danfoss Termix VVX-B-7 BS Series User manual

OperatingGuide
TermixVVX-B–7SeriesBS
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.............................................................10
5.1Design...............................................................10
5.2Schematicdiagram................................................11
6.0Controls..........................................................12
6.1Heatingcircuit......................................................12
6.2DHWtemperaturecontrol........................................16
6.3Other.................................................................17
6.4Extras................................................................18
6.5Maintenance........................................................19
7.0Troubleshooting..............................................20
7.1Troubleshootingingeneral......................................20
7.2TroubleshootingDHW............................................20
7.3TroubleshootingHE...............................................21
7.4Disposal.............................................................22
8.0Declaration......................................................23
8.1Declarationofconformity........................................23
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OperatingGuideTermixVVX-B–7SeriesBS
2.0Functionaldescription
Indirectsubstationforsingleandmulti-familyhouseswith
upto7ats.
Application
TheTermixVVX-Bisacompletesolutionforhotwaterand
spaceheatingwithoptimalsafety,efcientenergytransfer,
service-friendlyconstructionandacompactdesign.Thesubstation
isusedifaheatexchangerisrequiredoronaconversiontodistrict
heatingwheretheexistingequipmentisunsuitablefordirect
connection.
Districtheating(DH)
Thesubstationisprefabricatedwithadifferentialpressure
controller,ttingpieceandsensorpocketsforinsertionofaheat
meteraswellasstrainersandballvalves.
Heating(HE)
Theheatingsideconsistsofaplateheatexchanger,safetyvalve,
manometer,thermometers,ballvalves,drainvalve,airvalve,
expansionvesselandcirculationpump.Thetemperatureofthe
heatingcanbecontrolledthermostaticallyorbyanelectronic
controllerwithanoutdoortemperaturesensor.Dependingonthe
application,differentheatexchangersdimensionedforcentralor
underoorheatingcanbeused.
Domestichotwater(DHW)
Thedomestichotwaterispreparedintheheatexchangerandthe
temperatureisregulatedwithathermostaticcontrolvalve.The
patentedsensoracceleratoracceleratestheclosingoftheDanfoss
AVTBvalveandprotectstheheatexchangeragainstoverheating
andlimescaleformation.Thesensoracceleratorhelpstoensurea
stablehotwatertemperaturebyvaryingloads,owtemperatures
anddifferentialpressurewithouttheneedforreadjustingthevalve.
TheheatexchangercoolstheDHwaterveryefciently,thereby
creatingaverygoodoperatingeconomy.Thesensoraccelerator
andAVTBvalvealsoworksasabypasskeepingthehousesupply
linewarm.Thisshortensthewaitingperiodsduringsummerwhen
theheatingsystemisinreducedoperation.
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OperatingGuideTermixVVX-B–7SeriesBS
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
110°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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OperatingGuideTermixVVX-B–7SeriesBS
4.0Mounting
4.1Mounting
Installationmustbeincompliancewithlocalstandardsand
regulations.
Districtheating(DH)-Inthefollowingsections,DHreferstothe
heatsourcewhichsuppliesthesubstations.Avarietyofenergy
sources,suchasoil,gasorsolarpower,couldbeusedasthe
primarysupplytoDanfosssubstations.Forthesakeofsimplicity,
DHcanbetakentomeantheprimarysupply.
Connections:
1.Domesticcoldwater(DCW)
2.Domestichotwater(DHW)
3.Districtheating(DH)return
4.Districtheating(DH)supply
5.Heating(HE)return
6.Heating(HE)supply
Connectionsizes:
DH+HE:G¾”(int.thread)
DCW+DHW:G¾”(int.thread)
Dimensions(mm):
Withoutcover:H750xW530xD350
Withcover:H800xW540xD430
Weight(approx.):40kg
Authorizedpersonnelonly
Assembly,start-upandmaintenanceworkmustbeperformedby
qualiedandauthorizedpersonnelonly.
Thepipeplacementcandeviatefromtheshowndrawing.Pleasenote
themarkingsonthestation.
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OperatingGuideTermixVVX-B–7SeriesBS
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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OperatingGuideTermixVVX-B–7SeriesBS
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
10–151,5
15–202,0
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OperatingGuideTermixVVX-B–7SeriesBS
Underoorheating:
Pumpstopfunction
Ifthesubstationisusedinconnectionwithunderoorheating,the
circulationpumpmustbeconnectedtothepumpstopfunctionin
theunderoorheatingcontroller.Thepumpmustbestoppedif
allunderoorheatingcircuitsareclosed.
Warranty
Ifthisisnotpossible,thenowmustbecontinuedthroughthe
by-pass.Failingthis,thepumpwillbeatriskofseizureandany
remainingwarrantywillbewithdrawn.
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.
4.3.1Thermoactuators
Activatingthethermoactuators
Thethermoactuatorsaresuppliedwitha“rstopen”function,such
thattheyareslightlyopenforfrostprotectionuntiltheelectrical
controllerisinstalled.Duringcommissioning,the“rstopen”
functionisdisabledbyremovingtheredmountingsplitonthe
thermoactuator.
Pleasecheckthatthethermoactuatorscanfullyclosefollowing
disablementofthe“-rstopen”function.
Seetheinstallationguideincludedwiththethermoactuator.
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OperatingGuideTermixVVX-B–7SeriesBS
4.3.2IMITThermostat
IMITThermostat
TheIMITThermostatisusedtolimittheunderoorheatingow
temperature.TheIMITThermostatispresetto60°C,shutting
offthepumpandtheprimaryon/offvalvewhentheowtothe
underoorheatingexceeds60°C.
TheIMITThermostatis(ifnotalreadyfactory-tted)tobettedon
thesecondaryowpipeasclosetotheheatinginterfaceunitas
possibleusingthesteelbandprovided.
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OperatingGuideTermixVVX-B–7SeriesBS
4.3.3Wiringdiagram
Radiatorheating
Underoorheating
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OperatingGuideTermixVVX-B–7SeriesBS
5.0Design
5.1Design
Yoursubstationmightlookdifferentthanthesubstationshown.
Designdescription
AHeatexchanger,HE9Strainer38Expansiontank
BHeatexchanger,DHW10Circulatorpump41Fittingpiece,energymeter
4Safetyvalve20Filling/drainvalve48Airvent,manual
7AThermostaticvalve,HE26Pressuregauge69On/offvalve
7BThermostaticvalve,DHW31Differentialpressurecontroller
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OperatingGuideTermixVVX-B–7SeriesBS
5.2Schematicdiagram
Mountingrail
DHW
DCW
DH
Supply
HE
Supply
DH
Return
HE
Return
Yoursubstationmightlookdifferentthantheschematicdiagramshown.
Schematicdescription
AHeatexchanger,HE9Strainer31Differentialpressurecontroller
BHeatexchanger,DHW10Circulatorpump38Expansiontank
LBorderofdelivery14Sensorpocket,energymeter41BFittingpiece,energymeter
MElectricalwiringbox18Thermometer41CFittingpiece,Shut-off-valve
1Ballvalve20Filling/drainvalve48Airvent,manual
2BDoublecheckvalve,WRAS24Deliveredloosewithunit62BPressureAbsorberwithnon-returnvalve
4Safetyvalve26Pressuregauge69On/offvalve
7Thermostaticvalve
DHW:DomesticHotWater
DCW:DomesticColdWater
DHSupply:DistrictHeatingSupply
DHReturn:DistrictHeatingReturn
HESupply:HeatingSupply
HEReturn:HeatingReturn
5.2.1Technicalparameters
Technicalparameters
Nominalpressure:PN10(PN16versionsareavailableonenquiry)
Max.DHsupplytemperature:110°C
Min.DCWstaticpressure:0.5bar
Brazingmaterial(HEX):Copper
Heatexchangerstestpressure:30bar
Soundlevel:≤55dB
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OperatingGuideTermixVVX-B–7SeriesBS
6.0Controls
6.1Heatingcircuit
6.1.1Differentialpressurecontroller
Thedifferentialpressurecontrollersmoothsouttheuctuationsin
pressurearrivingfromthedistrictheatingnetwork.Theoperating
pressureinthesubstationisthusheldsteady.
6.1.2HEtemperaturecontrol
TheHEowtemperatureintheheatingcircuitiscontrolledbythe
HEtemperaturecontroller.
6.1.3RAVKcontroller
RAVKcontroller(35-75°C).Thetemperaturesettingisasfollows:
1=30°C
2=40°C
3=52°C
4=64°C
5=76°C
Thevaluesareintendedasaguide.
Thermostaticcontrol
ThetemperatureoftheHEowlineisadjustedasfollows:
Toincreasetemperature,turnthehandleonthethermostatic
controllertoselectahighernumber.
Todecreasetemperature,turnthehandleonthethermostatic
controllertoselectalowernumber.
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OperatingGuideTermixVVX-B–7SeriesBS
6.1.4RAVKcontroller
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.
6.1.5AVTBcontroller(30–100°)
Thetemperaturesettingisasfollows:
1=35°C
2=55°C
3=75°C
4=95°C
5=100°C
Thevaluesareintendedasaguide.
Thermostaticcontrol
ThetemperatureoftheHEowlineisadjustedasfollows:
Toincreasetemperature,turnthehandleonthethermostatic
controllertoselectahighernumber.
Todecreasetemperature,turnthehandleonthethermostatic
controllertoselectalowernumber.
6.1.6Flowcontrollerwithintegratedcontrolvalve
Thecontrollerisaself-actingowcontrollerwithintegratedcontrol
valve.Thecontrollercloseswhensetmax.owisexceededand
canbeusedincombinationwithDanfosselectricalactuatorswith
orwithoutsafetyfunction.Springreturnmotorcanbeusedas
safetyfunctionbypowerfailure.
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OperatingGuideTermixVVX-B–7SeriesBS
6.1.7Electroniccontrol
Substationswithelectroniccontrolmustbesetinaccordancewith
manufacturer´sinstructions.
Wheretheroomtemperatureiscontrolledbyradiatorthermostats,
itisrecommendedthatthermostatsbesetforminimum
temperatureineachroom.
6.1.8Outdoortemperaturesensor(ESMT)
Outdoorsensorsshouldbemountedsoastoavoidexposureto
directsunlight.Theyshouldnotbeplacedclosetodoors,windows
orventilationoutlets.
6.1.9TP7001
TP7001electronic7dayprogrammableroomthermostat.
Signalsfromtheroomthermostatcanbeusedtocontrolzone
valves.
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OperatingGuideTermixVVX-B–7SeriesBS
6.1.10CirculatorpumpUPM3
UPM3Pumpscanbecontrolledinconstantpressure,proportional
pressureorconstantspeedmodedenedbythemeansofasmart
userinterface.
Thevariablespeedmodulatingmodesallowthepumptomatchits
performancetothesystemrequirements,helpingtoreducenoise
whenthermostaticvalvesareclosingdown.
EnergylabellingclassA
6.1.11GrundfosUPM3AUTOLinstructions
Controlmode
Youcanswitchfromtheperformanceviewtothesettingsviewbypressingthepushbutton.Thesettingsviewshowswhichmode
controlsthecirculator.After2seconds,thedisplayswitchesbacktoperformanceview.
Ifyoupressthebuttonfor2to10seconds,theuserinterfaceswitchesto"settingselection"iftheuserinterfaceisunlocked.Youcan
changethesettingsastheyappear.Theselectionofthecontrolmodedependsonthesystemtypeandtheallocationofpressurelosses.
Ifyoupressthekeylockformorethan10seconds,youcantogglebetweenenabling/disablingthekeylockfunction.
FunctionRecommendedforGreenYellowYellowYellowYellow
Proportionalpressure11-pipesystemsµµ
Proportionalpressure2µµµ
Proportionalpressure32-pipesystemsµµµµ
Constantpressure1Underoorheatingµµ
Constantpressure2µµµ
Constantpressure3µµµµ
ConstantCurve1µµµ
ConstantCurve2µµµµ
ConstantCurve3µµµµµ
ConstantCurveMax.µµµµ
Operationstatus
FunctionRecommendedforGreenYellowYellowYellowYellow
Standby**OnlyPWMcontrolledµ
0%≤P1≤25%µµ
25%≤P1≤50%µµµ
50%≤P1≤75%µµµµ
75%≤P1≤100%µµµµµ
Alarmstatus
FunctionRecommendedforRedYellowYellowYellowYellow
Blockedµµ
Supplyvoltagelowµµ
Electricalerrorµµ
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OperatingGuideTermixVVX-B–7SeriesBS
6.1.12HEpressuregauge
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.
6.2.2Electric2–waymotorizedvalve
Actuatorswithorwithoutsafetyfunctionareavailablefor3-point
controls.Spring-returnactuatorscanbeusedtoprovidesafety
shut-offintheeventofpowerfailure.
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OperatingGuideTermixVVX-B–7SeriesBS
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.
6.3.3PressureAbsorber
ThePressureAbsorberreducesoverpressurecreatedinthesystem
causedbysuddenopening/closingoftaps,soadischargeoutlet
isomitted.ThePressureAbsorbercanbeusedasasubstituteto
thesafetyvalve.
ByreducingsuchoverpressuresthePressureAbsorberensures
properfunctioningofthecomponentslocatedinthesystem.Itwill
alsoconsiderablyreducethenoisegeneratedbyvibrationthat
occursduetothesuddenclosureoftheinterceptions.
ThePressureAbsorbermaynotbeappliedinsystemswithhot
watercirculation.
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OperatingGuideTermixVVX-B–7SeriesBS
6.3.4Fittingpiece
Thesubstationisequippedwithattingpieceforenergymeter.
Assemblyofenergymeters:
1:Closeballvalves
ClosetheballvalvesonDHSupplyandDHReturn,ifthereiswater
onthesystem.
2:Loosennuts
Loosenthenutsonthettingpiece.
3:Removettingpiece
Removethettingpieceandreplaceitwiththeenergymeter.Do
notforgetthegaskets.
4:Tightenconnections
Aftermountingoftheenergymeterremembertocheckand
tightenallthreadedconnections.
Sensorpocket,energymeter
Thesensorsoftheenergymeterismountedinthesensorpockets.
6.4Extras
6.4.1Hotwaterrecirculationpump
Whenhotwaterrecirculationpumpisinstalledtogetherwith
thePre-Paymentunit,itisrecommendedforthepumptotake
SwitchedLivefromTerminal2intheheatinginterfacewiringbox.
Thisistoensurethatthepumpstopscirculatingwhennocreditis
availableonthePre-Paymentunit.
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OperatingGuideTermixVVX-B–7SeriesBS
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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OperatingGuideTermixVVX-B–7SeriesBS
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
Insufcientcreditonthepre-paymentunit,
ifinstalled.
Topupyourcredit.
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.
ThermostaticcontrolvalvedoesnotcloseTemperaturedifferencebetweenDH
supplyandDHWsetpointtoolow.
Lowerthesetpointtemperatureor
increasetheDHsupplytemperature.
20DEN-GTLGB40404