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TECHNICALPRODUCTINFORMATION

FLUIDHEATERSTypeRM3/4
February2008

MESDEAs.a.–Service-
Copyingofthisdocumentandgivingittoothersandtheuseorcommunicationofthecontentsthereofareforbiddenwithoutexpressauthority.Offendersareliabletothepaymentofdamages.AllrightsreservedintheeventofgrantofapatentortheregistrationofutilitymodelordesignDoc.No.UM-FluidHeaterRM3RM41.7-GEN_en
Rev.1.7Page1di13

TECHNICALPRODUCTINFORMATION

Tableofcontents
12
RM3/4Wiring..............................................................................................................................3Signalsdescription:.....................................................................................................................3
2.1GND.....................................................................................................................................................32.2HEATER_EN(10mA@12V..........................................................................................................42.3FAULT_OUT......................................................................................................................................42.4PLUS_POWER(+..............................................................................................................................42.5MINUS_POWER(-............................................................................................................................4
3BlockDiagramDescription:.......................................................................................................4
3.1SemiconductorFuse...........................................................................................................................43.2SecondaryHVPowerSupply(SPS..................................................................................................53.3ThermalBimetallicSwitch(TBSW.................................................................................................53.4PowerCurrentElevator(PCE.........................................................................................................53.5HVPowerSupply...............................................................................................................................53.6Microprocessor...................................................................................................................................53.7PowerSwitchingModule(PSM.......................................................................................................53.8FluidSemiconductorTemperatureSensor......................................................................................53.9OptoIsolation.....................................................................................................................................6
4FunctionalDescription:..............................................................................................................8
4.1MountingConsiderations..................................................................................................................84.2ConstantPowerControl....................................................................................................................84.3FluidFlowInterruptionControl.......................................................................................................84.4LiquidAbsenceDetection..................................................................................................................84.5GeneralConsiderations......................................................................................................................8
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MechanicalDimensionRM3:(3DCADonrequest................................................................9MechanicalDimensionRM4:(3DCADonrequest..............................................................10RM3/RM4pressuredrop..........................................................................................................11CirculationPumpMR600.........................................................................................................12Maintenanceandservices.........................................................................................................13

Doc.No.UM-FluidHeaterRM3RM41.7-GEN_en

Rev.1.7Page2di13

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