Installation Guide - Wiring & Plumbing - Wunda

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Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUST 0800 5420 816www.wundafloorheating.co.ukE09General GuideThe following guide illustrates how Wundafloor warm water underfloor heating systems can be coupled togetherwith the majority of central heating plumbing and control systems.The majority of modern central heating systems make use of motorised valves, often called Zone valves, to dividedifferent heating systems and hot water generation ie. Radiators, Under Floor Heating and Hot water cylinder.Systems using combination boilers will also need zone valves if separate systems of heating require different timesand temperatures.Quite often ground and first floors are controlled separately as they may have different uses. The zone valve actslike a relay, meaning any system can call the boiler/ heat source without other areas being activated.1If the underfloor system is being encorporated alongside a radiator system it is even more important that theseareas are controlled independently as ‘heat up’ and ‘cooling off’ times are different. We recommend the ‘S’ planlayout is adopted as this allows for more variety in zoning, and should be very familiar to qualified plumber/electricians. The schematics show typical S-plan heating systems with under floor heating encorporated.NOTE:An Auto By-Pass valve (ABV) should be incorporated in all systems.NOTE:If a Heat pump manifold has been supplied then there will be no pump on the manifold. Therefore the relay onthe H-Box wiring centre is used to switch on a shunt pump which will send primary water from abuffer tank or the heatpump itself to the manifolds.Wundafloor does not supply: ‘S’ plan wiring centre Cylinder thermostat Hot water time clock Auto bypass valvePlumbing and Wiring SchematicsSection ASystem Boiler with hot water cylinder, radiators & UFH1a) Plumbing Schematic2a) Multi Zone Wiring Schematic3a) Single Zone Wiring SchematicSection BCombination Boiler with radiators & UFH1b) Plumbing Schematic2b) Multi Zone Wiring Schematic3b) Single Zone Wiring SchematicSection CAdding Single Zone kit to exisiting radiator system1c) Plumbing Schematic2c) Wiring Schematic3c) Plumbing Schematic (Danfoss kit)Section DH-Box-12 Wiring Schematics1d) H-Box-12 V1.22d) H-Box-12 (previous model)Section EInstalling a Wet Room ThermostatSection FSchematic - Wireless Control Centre E8.583RFSection GSchematic - Wireless Receiver (single zone) E8.413RF / E8.423RFMotorised / Zone valves and Pipe stats are available if requested.Revision Date: 5/10/2017

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection A 0800 5420 816www.wundafloorheating.co.ukE091A : Schematic - System Boiler with hot water cylinder, radiators & UFHHWCRadiatorsZone ValvesCirculationpump2BoilerABVUnder FloorHeating systemsupplied byWundaRevision Date: 5/10/2017

E09Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection A 0800 5420 816www.wundafloorheating.co.uk2A : Typical wiring scheme for multi-zone UHF system with a System Boiler2A Typical wiring scheme for multi zone UFH system with a System BoilerCirculatingPumpOmitted forclarity230V50HzL N EHot waterCylinder StatRadiatorsRoom StatBoiler1CL N L1LNWundafloor wiring centre used withmultiple Programmable thermostats onUFH system.1CSwitch PumpRelay RelaySL312345678910230vInputThis drawing is for guidance only.All installations should be undertakenby a qualified person only.This drawing is forguidance only.All installationsshould be undertakenby aqualified person only.LENS-PlanWiring centreUnderfloorHeating pumpBBBTime ClockMGGMOORadiatorsZone ValveMHot WaterZone ValveGONL00:00HT HWSon onUFHZone ValveSome Earths & Neutralsomitted for clarity3A Typical wiring scheme for single zone UFH system with a System BoilerWiring KeyOOrangeGGreyBBrownRevision Date: 5/10/2017

GMGMMGOONOHT HWSon onLInstallationguideUFH - wiring & plumbingHot WaterRadiatorsZone ValveTHE BRAND YOU CAN TRUSTSection AZone ValveZone ValveWiring KeyE09OOrangeGSome Earths & Neutrals 0800 5420www.wundafloorheating.co.ukomitted816for clarityGreyBBrown3A : Typical wiringsinglezone wiringschemesinglezoneUFHa systema System BoilerCirculatingPumpOmitted forclarity230V50HzHot waterCylinder StatRadiatorsRoom StatBoilerWundafloor ProgrammableThermostat*Thermostat may be1CL N L1LNL N L11CSL**Standard dial thermostats***L N E412345678910powered from a seperated(localised) fused spur.This drawing is for guidance only.All installations should be undertakenThis drawing is forby a qualifiedperson only.guidanceonly.All installationsshould be undertakenby aqualified person only.may be power from a timeclock.LS-PlanWiring centreENUnderfloorHeating pumpBBBTime ClockMGGMGOORadiatorsZone ValveMHot WaterZone ValveOUFHZone ValveSome Earths & Neutralsomitted for clarity7NL00:00HT HWSon onWiring KeyOOrangeGGreyBBrownRevision Date: 5/10/2017

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUST 0800 5420 816www.wundafloorheating.co.ukE09Revision Date: 5/10/2017

E09Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection B 0800 5420 816www.wundafloorheating.co.uk2B: Typicalwiringwiringscheme formulti zoneforUHFmultisystemzonewith a Combination2BTypicalschemeUFH withBoilera combinationCombi Boiler Time Clock00:00This drawing is for guidance only.All installations should be undertakenby a qualified person only.Wundafloor wiring centre used with multipleProgrammable thermostats on UFH system.RAD roomstatSwitch PumpRelay RelayL N L1230vInputLENL N SL SIboilerThis drawing is for guidance only.All installations should be undertaken by aqualified person only.UnderfloorHeating pumpSome Earths & Neutralsomitted for clarity6Wiring Schematic AS-PlanWiring centre12345678BM910BGMOL N E230V50HzRadiatorsZone valveGOUnderfloorZone valveWiring KeyOOrangeGGreyBBrownRevision Date: 5/10/20173B Typical wiring scheme for single zone UFH with a combination boiler

MGMOL N E230V50HzOOUnderfloorInstallationguide - wiring & plumbingZone valveGRadiatorsZone valveTHE BRAND YOU CAN TRUSTSection BWiring KeyG 0800 5420 B Typical wiring scheme for single zone UFH with a combination boiler3B : Typical wiring scheme for single zone UHF system with a Combination BoilerWundafloor ProgrammableThermostat*Thermostat may bepowered from a seperated(localised) fused spur.L N L1RAD roomstatCombi Boiler Time Clock00:00L N L1L N SL SIqualified person only.**Standard dial thermostats***230V50HzThisdrawingis foronly.guidance only.This drawingis for guidanceAllinstallationsAll installationsshould beshouldundertakenbeby aundertakenby a qualified person only.may be power from a timeclock.L N ELEN7S-PlanWiring centre12345678BSomeEarths &Neutralsomitted forclarity910UnderfloorHeating pumpBWiring KeyMGMGORadiatorsZone valveOUnderfloorZone valve8OOrangeGGreyBBrownRevision Date: 5/10/2017

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection C 0800 5420 816www.wundafloorheating.co.ukE091C : Schematic - Adding single area UFH to an existing radiator systemHWCRadiators**8ABVCombi or SystemBoiler* Connections to existingUnder FloorHeating systemsupplied byWundaradiator flow & returnRevision Date: 5/10/2017

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection C 0800 5420 816www.wundafloorheating.co.uk2Cschematicwiring forschematicsinglezonekit2C : Wiringsingle zone kitforaddedto radiatorsystemE09added to radiator system230V50HzWundafloor ProgrammableThermostatL N EL N L1*A standard dial thermostatmay be power from a timeclock.*This is when a single zone underfloorheating kit is connected to an existingradiator system without an individual zoneThisvalveis whena single zone underfloor heating kit isfor the UFH and therefore unable toconnectedtoan existingradiatorsystem without ancall the boiler/heatsourceindependentlyindividualzone valve for the UFH and therefore unablefor heat.to call the boiler/heat source independently for heat.Although a room thermostat or programmable thermostat can be used to controlAlthougha room thermostat or programmable thermostatair temperature, this area can only be ONcanwhenbe usedcontrolair temperature,this area can onlythe toexistingheatingsystem is ON.9be ON when the existing heating system is ON.1234Terminal Block5 6 7 8 9When this is the case, a pipe thermostat10LENcanthisbe attachedto atheheatingmains canflow,be attachedWhenis the case,pipethermostatso that the new area of the underfloorto theheating mains flow, so that the new area of theknows when hot water is available andunderfloorhot wateris availablethereforeknowsstops whenthe pumprunningwhen no and thereforestopstheispumprunning when no heat is available.heatavailable.This drawing is for guidance only.All installations should be undertakenby a qualified person only.UnderfloorHeating pumpPipe thermostatset at 35 CRevision Date: 5/10/2017

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection C 0800 5420 816www.wundafloorheating.co.ukE093C : Schematic - Danfoss FHV-R Kit to an existing radiator systemHWCRadiators**10ABVThis diagram show how a Danfoss FHV-R isconnected to and existing radiator system.Combi orSystem Boiler* Connections to existingradiator flow & returnDanfoss FHV-RPlease note: The valve should be used with a maximumof 100m of 16mm Wundapipe. The valve must be positioned on the returnfrom the heated floor. It is recommended that isolation valves areused for filling and maintenance. The supply pipework must not be less than15mm. The heating engineer must check that theis adquate flow available from the heatingmains.Revision Date: 5/10/2017

CurrentModelCurrentModelTechnical E.D.)L.E.D.)(IdentifiableSupply voltage230V AC, 50/60HzTechnicalData.Data.Technical230V AC,50/60HzOutput ion guide - wiring & plumbing4A free relay output4ALeft Hand: 1 x potentialRight Hand:1 x12independentrelay output12zoneszones(230V AC, otentialfreerelayTwo Relays will be engaged wheneveroutputoneor outputoutputRightrelaythermostatscall for heating.(230VAC,3A)(230VAC,3A)The relays will be disengaged when all the neorormoremoreTwowillwheneveronethermostatsstop ating.thermostats0 C-50 gactivitythermostatsheatingactivity310 Wstopx 110H x ut(2 minutes esdelay)THE BRAND YOUCANTRUST 0800 5420 816Ambient temperatureDimension (mm)Wiring centre - H-Box-12 V1.2PCB versionH-Box-12 V1.4 (Current model)1D : Schematic - Wiring Centre - H-Box-12 V1.2 (currentmodel)Wiring centre - H-Box-12 V1.2Technical Data.230V AC, 50/60HzOutput voltage230V AC,50/60HzMax.LoadRelay OutputT6360C(2 minutes 360CRTC84.13Ambient temperatureRTC86.13RTC86.13Dimension eenroom room‘stat222RTC75.713TRTC75.713TRTC75.713T Room thermostatNNLLL1LLNNL1 NNL1L1NL1L11 1111Button room statLLNN24424 -Sensor 6 - 73Sensor 6 - 7TransformerL1NSensor 6 - .D. L.E.D.LNNL*Optional LinkNNL L NN*LNN*OptionalLinkLink*OptionalAmbient temperatureDimension (mm)LLLLLIVE - 1LIVE- -11LIVENN- -22SL- -44SLBoiler / zone valve switchVoltage free OR with link 230VBoiler / zone valve switchVoltage free OR with link 230VNLLFrom main heating controlsNPower input (230VAC, Link fitted - Can be used as low voltage switching for Boiler/heat itted- alLinkLinkfittedfitted- eWithout11L1 Without OptionalLink fitted - Canswitching forRTC84.131 be2used4 as low voltageBoiler/heat sourceFrom main heatingcontrolsLLPower input N(230VAC,50/60Hz)NWith Optional Link fitted - Can be used as a 230v switch live output to zone valve or boiler/heat sourceWithout Optional Link fitted - Can be used asBoilerlowvoltageswitchingfor switchBoiler/heatBoilerzonevalveswitch source/ /zonevalveVoltage Free nputWith Optional Link fitted - Can be used as a 230v switch live outputto zone valve or e FreeRoomSwitch With Optional LinkfittedCanbeusedasa230vswitchlive output toT6360C263Link 3-5zone valve or boiler/heatRTC86.13 source124Sensor 6 - 7LIVE - 1NN-2- 2SLSL-4 - omroomstatstatlinkedtotooneFree Switch* Voltage0 C-50 C310 W x 110 H x 55 DLpumpManifoldManifoldpumppumpMax. 4 actuators can beLeft Hand: 1 x potential free relay outputRight Hand:1 x independent relay output(230V AC, 3A)Two Relays will be engaged whenever one or morethermostats call for heating.The relays will be disengaged when all the zonethermostats stop heating activityRelay Output(2 minutes old12 zonesTimerRTS 80.70*Optional LinkManifoldpumpMax. 4 actuatorscanbe room statlinkedto onelinked to one room stat4ANoteSensor6SensorSensor6 6--7- 77Link 3-522230V AC,50/60HzNumber of zone outputs3TransformerRTC75.713T230V AC, 50/60HzOutput voltageL1Transformer1Supply 3Touch screen room ‘statGroundGround443LTechnical Data.Sensor-- 6 - 722 2 2 336 3T6360CRTC86.13Ground44TerminalRTC84.13NN12 zonesTerminalNoteLeft Hand: 1 x potentialfree relay outputHand:1 x independent relay outputLL NNRightL1L1263 (230VLink3-5AC, 3A)Two Relays will be engaged whenever one or ing.124Sensor6-7The relays will be disengaged when all the zoneLinkheating3-5 activity22 66 thermostats33Link3-5stop1240 C-50 CSensor66- -7711 22 44310 WSensorx 110 H x 55 DE91.713RTC84.13RTC84.13111Touch screen room ‘statL roomL (identifiableby modelZDA0003-V1.2on PCB and additionof L.E.D.)(Identifiableby No.modelno. H-box212 V1.4on PCB)(Identifiable by model No. ZDA0003-V1.2 on PCB and addition of L.E.D.)4AL1FUSE (max. 10A)FUSE FUSE(max. 10A)(max. 10A)2 x 5mm FAST BLOW2 x 5mm2 xFAST5mm BLOWFAST BLOWNumber of zone outputsRoom thermostatLE91.713Touch screen room ‘statRTC75.713TButton room statLLNNL1112423Sensor 6 - 7Sensor 6 - 70A)T BLOWSupply turetemperature0 C-50 CAmbientCurrent0 C-50 310xx55DD addition of L.E.D.)(Identifiable by model No. ZDA0003-V1.2onHHPCBFUSE (max. 10A)2 x 5mm FAST BLOWSection rof zone outputsMax.LoadMax.LoadRevision Date: 5/10/2017Transformer

Current Model(Identifiable by model No. ZDA0003-V1.2 on PCB and addition of L.E.D.)Technical Data.Supply voltage230V AC, 50/60HzOutput voltage230V AC,50/60Hz4ANumber of zone outputsRelay Output(2 minutes delay)THE BRAND YOU CAN TRUST12 zonesLeft Hand: 1 x potential free relay outputRight Hand:1 x independent relay output(230V AC, 3A)Two Relays will be engaged whenever one or morethermostats call for heating.The relays will be disengaged when all the zonethermostats stop heating activity 0800 5420 816Ambient temperatureDimension (mm)0 C-50 C310 Wx 110 H x 55- DH-Box-12 V1.2 (current2D(Previousmodel)1D : Schematic - WiringCentremodel)Wiring centre - H-Box-12 V1.2(Identifiable by model no. ZDA0003-V1.2)NCurrent Model(identifiable by model No. ZDA0003-V1.2on PCB and addition of L.E.D.)(Identifiable by model No. ZDA0003-V1.2 on PCB and addition of L.E.D.)L1TerminalTechnical Data.NoteT6360C263Link 3-5RTC86.13124Sensor 6 - 724RTC84.131E91.713E91.713TouchTouchscreenscreen roomroom stat‘statRTC75.713TRTC75.713TButtonroomstat statButtonroomLLNN-24Sensor 6 - 7112233SensorSensor 66 --77 L.E.D.*LNN4A12 zonesLeft Hand: 1 x potential free relay outputRight Hand:1 x independent relay output(230V AC, 3A)Two Relays will be engaged whenever one or morethermostats call for heating.The relays will be disengaged when all the zonethermostats stop heating activityRelay Output(2 minutes delay)NGround230V AC,50/60HzNumber of zone outputsTransformerL1230V AC, 50/60HzOutput voltageMax.Load1L1Supply voltageAmbient temperatureDimension (mm)0 C-50 C310 W x 110 H x 55 DL*Optional LinkLManifoldpumpMax. 4 actuators can belinked to one room stat* Voltage Free SwitchL1 Without OptionalLink fitted - Canswitching forRTC84.131 be2used4 as low voltageBoiler/heat sourceLIVE - 1N-2SL - 4Boiler / zone valve switchVoltage free OR with link 230VNthermostatTerminalNote*Voltage FreeRoomSwitch With Optional LinkfittedCanbeusedasa230vswitchlive output toT6360C263Link 3-5zone valve or boiler/heatRTC86.13 source124Sensor 6 - 7TimerRTS 80.70NLFrom main heating controlsPower input (230VAC, 50/60Hz)With Optional Link fitted - Can be used as a 230v switch live output to zone valve or boiler/heat sourceWithout Optional Link fitted - Can be used as low voltage switching for Boiler/heat sourceE91.713Touch screen room ‘statRTC75.713TButton room statLLNNL1112423Sensor 6 - 7Sensor 6 - 70A)T BLOWLRoom thermostat1211www.wundafloorheating.co.ukFUSE (max. 10A)2 x 5mm FAST BLOWSection DE09Installation guide - wiring & plumbingMax.LoadRevision Date: 5/10/2017Transformer

Previous modelTechnical Data.Supply voltage230V AC, 50/60HzOutput voltage230V AC,50/60Hz4ANumber of zone outputs12 zonesLeft Hand: 1 x potential free relay outputRight Hand:1 x independent relay output(230V AC, 3A)Two Relays will be engaged whenever one or morethermostats call for heating.The relays will be disengaged when all the zonethermostats stop heating activityRelay Output(2 minutes delay)THE BRAND YOU CAN TRUST 0800 5420 816Ambient temperatureDimension (mm)0 C-50 C310 W x 110 H x 55 D3D : Schematic - Wiring Centre - H-Box-12 (Old(previousm- no LED on PCB)model)LRoom thermostatNWiring centre - H-Box-12Previous modelL1TerminalNoteTechnical Data.T6360C263Link 3-5RTC86.13124Sensor 6 - omroom stat‘statRTC75.713TRTC75.713TButton kLLNNL1-124Sensor 6 - 711233SensorSensor 66 --77TransformerN*230V AC, 50/60HzOutput voltage230V AC,50/60Hz4ANumber of zone outputsL1GroundSupply voltageMax.LoadN12 zonesLeft Hand: 1 x potential free relay outputRight Hand:1 x independent relay output(230V AC, 3A)Two Relays will be engaged whenever one or morethermostats call for heating.The relays will be disengaged when all the zonethermostats stop heating activityRelay Output(2 minutes delay)FUSE (max. 10A)2 x 5mm FAST BLOWSection DE09Installation guide - wiring & plumbingMax.LoadAmbient temperatureDimension (mm)0 C-50 C310 W x 110 H x 55 DLOptional Link*TimerRTS 80.70ManifoldpumpRTC86.13L1124Sensor 6 - 7NLFrom main heating controlsPower input (230VAC, 50/60Hz)With Optional Link fitted - Can be used as a 230v switch live output to zone valve or boiler/heat sourceWithout Optional Link fitted - Can be used as low voltage switching for Boiler/heat sourceE91.713Touch screen room ‘stat124Sensor 6 - 7RTC75.713TButton room statLLNN123Sensor 6 - 7Revision Date: 5/10/2017)BLOWMax. 4 actuators can belinked to one room stat* Voltage Free SwitchN Without Optional Link fitted - Can be used as low voltage switching forRTC84.13124Boiler/heat sourceLIVE - 1N-2SL - 4Boiler / zone valve switchVoltage free OR with link 230VL*Voltage FreeRoomSwitchthermostatTerminalNote With Optional Link fitted - Can be used as a 230v switch live output toT6360C263Link 3-5zone valve or boiler/heat source

Installation guide - wiring & plumbingTHE BRAND YOU CAN TRUSTSection E 0800 5420 816E09Installing Wet Room ThermostatsUnit can be used as a floor temperature sensor or an air temperature sensor.*Bathroom Stat14www.wundafloorheating.co.uk3000mm ProbeEnsure hole is sealedbetween wall space andprobe housing so thatonly the wet room airtemperature is detectedProbe Housing* models: RTC86.13, RTC75.713T & E91.713 can be used with a probeBathroom stat on outsideof wet room wallStatProbe housing on insideof wet room wallMax 3000mm distanceProbe HousingFor floor temperature sensing, place probe midway between pipe circuit runs tomonitor average floor temperature.For air temperature, place unit on outside wall of wet room in desired location atheight of 1500 mm from floor level.Check distance between thermostat’s terminal block and probe casing location ofwet room’s interior wall is no more than 3 metres.1500mm1500mmDo not trim probe sensor to length to ensure the probe wire is long enough tospan the distance between the unit’s terminal block, to go through prepared holethrough wall and exit into supplied probe housing fixed onto interior wall of wetroom at 1500 mm from wet room floor level.Revision Date: 5/10/2017

Wireless Control Centre E8.583RFParametersVoltage : AC230VCurrent : Max 3AWireless Frequency Output: 433MhzEffective Transmission Distance: 200m empty spaceTHE BRANDYOUCAN TRUST: -5 50 CAmbientTemperature 0800 5420 816Pump Linkage: 230V sub-outputBoiler/Zone Valve Linkage: Volt free or 230V with linkProtective Housing: Ip40SectionF : Schematic- Wireless Control Centre E8.583RFWeight1 KGInstallation guide - wiring & plumbingwww.wundafloorheating.co.ukE09Technical DataVoltage : AC230VCurrent : Max 3AWireless Frequency Output: 433MhzEffective Transmission Distance: 200mempty spaceAmbient Temperature : -5 50 CPump Linkage: 230V sub-outputBoiler/Zone Valve Linkage: Volt free or230V with link*Optional*OptionallinkLink15Protective Housing: Ip40Weight : 1 KGAC230V InputAC230VInputNOTE:Pump and switch relays have a 3 minute delay.BoilerswitchVoltageVoltagefreefreeBoiler // zone valve switchOROR withwith linklink 230v230vMaxconnectedMax33actuatorsactuators cancan bebe connectedtoto oneone channelchannel*VoltageManifold PumpManifoldPumpFree Switch* VoltageFree- Switch With OptionalLink fittedCan be used as a 230v switch liveoutput to zonevalveor boiler/heatsource WithOptionalLink fitted- Can be used as a 230v switch Without OptionalLink fitted - Can be used as low voltage switchinglivesourceoutput to zone valve or boiler/heat sourcefor boiler/heat Without Optional Link fitted - Can be used as low voltageE8.413RF/E8.423RF WirelessswitchingReceiver(SingleZone)for Boiler/heatsourceRevision Date: 5/10/2017

*Voltage Free Switch With OptionalLink fitted - Can be used as a 230v switch liveoutputto zone valveor -boiler/heatInstallationguidewiring &sourceplumbing Without OptionalLink fitted - Can be used as low voltage switchingfor boiler/heat sourceManifold PumpTHE BRAND YOU CAN TRUST 0800 5420 816www.wundafloorheating.co.uk8.413RF/E8.423RF Wireless Receiver (Single Zone)Section GE09Schematic - Wireless Receiver (single zone) E8.413RF / E8.423RFE8.413RF7654321Technical DataVoltage : AC230VCurrent : Max 3ASensor*L1 N13A(External Probe)16NL6Effective Transmission Distance: 200mempty space*External Limitation Value: 300C, 400C and500C if external probe is fitted. (Factory setting300C)E8.423RF7Wireless Frequency Output: 433Mhz54321Limitation Switch Differential: -20CAmbient Temperature: -50C – 500CProtective housing: Ip20Sensor*(External Probe)3AL1Potential freeoutput3AMain ControlcircuitNLHousing Material: Anti Flammable PC*OPTIONAL (not supplied with receiver)Revision Date: 5/10/2017

3A Typical wiring scheme for single zone UFH system with a System Boiler S-Plan Wiring centre S-Plan Wiring centre Section A 2A : Typical wiring scheme for multi-zone UHF system with a System Boiler This drawing is for guidance only. All installations should be undertaken by a qualified person only. Installation guide - wiring & plumbing E09

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