Ideal Boilers HE24 Installation And Servicing Instructions

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Ideal Boilers HE24 Installation And Servicing Instructions Manual pdf 6 page image

6 isar + programmer - Installation and ServicingGENERALINTRODUCTIONThe isar + programmer range of boilers is a wall mounted, full sequence,automatic spark ignition, low water content, fanned flue, high efficiency,condensing, combination gas boiler.A seven day programmer is built into the boiler, capable of 3 timed periodsper day.Note. Due to the high efficiency of the boiler a plume of water vapour will format the terminal during operation.Central heating (CH) output is fully modulating with a range of 8.8 to 23.4kW(30,000 to 80,000 Btu/h)Instantaneous domestic hot water (DHW) output is also fully modulating witha maximum of :HE24 23.4kW (80,000 Btu/h)HE30 29.3kW (100,000 Btu/h)HE35 35.2kW (120,000 Btu/h)The boiler is supplied fully assembled with DHW plate heat exchanger,diverter valve, circulating pump, pressure gauge, safety valve and CHexpansion vessel.Variable CH and DHW temperature controls are fitted on the user control andthe boiler features a DHW preheat facility.The boiler casing is of white painted mild steel with the user controlscapable of being mounted remotely from the boiler if the option is required.The boiler temperature controls are visible at the bottom RHS of the front panel.The heat exchanger is of cast aluminium.The boiler is suitable for connection to fully pumped, sealed water systemsONLY. Adequate arrangements for completely draining the system byprovision of drain cocks MUST be provided in the installation pipework.Pipework from the boiler is routed downwards as standard, but may berouted upwards behind the boiler using the stand-off frame (supplied in aseparate kit).OPERATIONWith no demand for CH, the boiler fires only when DHW is drawn off, orperiodically for a few seconds without any DHW draw-off, in order to maintainthe DHW calorifier in a heated condition.When there is a demand for CH, the heating system is supplied at theselected temperature of between 30 o C and 82 o C, until DHW is drawn off.The full output from the boiler is then directed via the diverter valve to theplate heat exchanger to supply a nominal DHW draw-off ofHE24 9.6 l/min at 35 o C temperature rise.HE30 12 l/min at 35 o C temperature rise.HE35 14.4 l/min at 35 o C temperature rise.The DHW draw off rate specified above is the nominal that the boiler flowregulator will give. Due to system variations and seasonal temperaturefluctuations DHW flow rates/temperature rise will vary, requiring adjustmentat the draw off tap.At low DHW draw-off rate the maximum temperature is limited to 65 o C by themodulating gas control.Refer also to Frame 1 - 'Boiler Water Circuit Diagrams'An additional feature incorporated within the boiler controls is boiler frostprotection.If the flow temperature drops below 7 o C the pump will run. If the temperaturecontinues to drop and goes below 4 o C, the boiler will fire until thetemperature exeeds 7 o C.The boiler features a comprehensive diagnostic system which gives detailedinformation on the boiler status when operating, and performance of keycomponents to aid commissioning and fault finding.SAFE HANDLINGThis boiler may require 2 or more operatives to move it to its installation site,remove it from its packaging base and during movement into its installationlocation. Manoeuvring the boiler may include the use of a sack truck andinvolve lifting, pushing and pulling.Caution should be exercised during these operations.1 BOILER WATERCIRCUIT DIAGRAMSCentral Heating CircuitExpansionvesselAutomaticair ventGas valvePlate heatexchangerPumpSafetyrelief valveCondensate'S' trapDivertervalveWaterpressuregaugeSumpFanBurnerCH FlowGasCondensatedrainDischargpipeCH ReturnDomestic Hot Water CircuitExpansionvesselAutomaticair ventHeatexchangerGas valvePumpSafetyrelief valveCondensate'S' trapDivertervalveWaterpressuregaugeSumpFanBurnerDHW Hot outGasCondensate drainDischarge pipeEcl 2768DHW Cold inPlate heatexchangerHeatexchangerOperatives should be knowledgeable in handlingtechniques when performing these tasks and thefollowing precautions should be considered:• Grip the boiler at the base.• Be physically capable.• Use PPE as appropriate, e.g. gloves, safetyfootwear.During all manoeuvres and handling actions, everyattempt should be made to ensure the followingunless unavoidable and/or the weight is light.• Keep back straight.• Avoid twisting at the waist.• Avoid upper body/top heavy bending.• Always grip with the palm of the hand.• Use designated hand holds.• Keep load as close to the body as possible.• Always use assistance if required.