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Fig.3



Key   

1 SupplementaryHeatExchanger 13 EngineAlternator

2 BurnerSupplementary 14 PCBControl

3 IgnitionElectrodes 15 WaterFlowSensor

4 FlameSensingElectrodes 16 SafetyThermostats

5 SupplementaryGasValve 17 FlowTemperatureSensor

6 EngineBurner 18 CondensateTrap

7 EngineIgnitionElectrode 19 ReturnTemperatureSensor

8 EngineFlameSensingElectrode 20 Fan

9 EngineGasValve 21 SpoolValveMotor

10 GasInlet 22 SpoolValve

11 BoilerFlow 23 Venturis

12 BoilerReturn 24 OvertravelSwitches

3.2FrostProtectionMode

1.Iftheboilerreturntemperaturefallsbelow7°C,thentheboilerpumpandheatingcircuitpump/valveareactivatedoropened.Ifthetemperaturerisesabove8°C,thefrost

protectionfunctionwillbeterminated.Iftheboilerreturntemperaturefallsbelow3°C,thesupplementaryburnerwillbeswitchedonuntilthereturntemperaturereaches

25°Candtheappliancefrostprotectionisstopped.

2.Ifthesupplementaryburnerislocked,theengineburnerwillbeused.Inthiscase,thereturntemperaturelimittostarttheburnerisincreasedfrom3to10°C.

3.Ifanexistingroomthermostatistobeusedthenfurtherprotectionforthesystemcanbeincorporatedbyusingawallmountedfrostthermostat.Incertaincircumstances

itmaybenecessarytofitapipethermostat.IftheTHINKControllerisusedasaroomsensorthenitwillactasaroomfrostprotectionunitaswellseeSection10.15.

3.3Pump/DiverterValveProtection

1.Thepumpandvalvekickisaprotectivefunctionaimedatpreventingthepumpsandvalvesfromseizing.

2.EveryFridayat3.00am,thepumpsandvalvesconnecteddirectlytotheboilerunitareswitchedon30secondsandofffor30seconds,onebyone.

3.4Legionella

1.WhenaDHWcylinderisfittedwithatemperaturesensoranantilegionellafunctioncanbeactivated,sothatatinitialDHWchargeandthereafteratregularintervalsthe

cylinderisheatedtodestroyanylegionellabacteria,thecylindertemperatureisraisedto65°C.

2.Bydefaultthisfunctionisnotactive.Customershavethechoicetoactivatethefunctionandsethowoften,oronwhatday,andatwhattimethisfunctionruns.