Ideal Boilers mini HE C24 Installation And Servicing

GENERALmini HE --- Installation & Servicing10Domestic Hot WaterIn hard water areas where mains water can exceed 200ppmTotal Hardness (as defined by BS 7593:1993 Table 2) a scalereducing device should be fitted into the boiler cold supplywithin the requirements of the local water company. The useof artificially softened water, however, is NOT permitted.Caradon Ideal Limited recommend the use of FernoxQantomat, GE Betz Sentinel Combiguard and CalmagCalPhos I scale reducing devices, which must be used inaccordance with the manufacturers’ instructions.For further information contact:FernoxCookson ElectronicsForsyth RoadSheerwaterWokingSurreyGU21 5RZ+44 (0) 1799 550811Calmag Ltd.Unit 4---6 Crown WorksBradford RoadSandbedsKeighleyWest YorkshireBD20 5LN+44 (0) 1535 210320Salamander (Eng) LtdReddicap Trading EstateSutton ColdfieldWest MidlandsB75 7BY+44 (0) 121 378 0952GE BetzSentinel DivisionFoundry LaneWidnesCheshireWA8 8UD+44 (0) 151 420 95633 ELECTRICAL SUPPLYWarning. This appliance must be efficiently earthed.Wiring external to the appliance MUST be in accordance withthe current I.E.E. (BS.7671) Wiring Regulations and any localregulations which apply. For Ireland reference should bemade to the current ETCI rules for electrical installations.The point of connection to the mains should be readilyaccessible and adjacent to the boiler, except for bathroominstallations where the point of connection to the mains MUSTbe situated outside of the bathroom.Note. Where a room sealed appliance is installed in a roomcontaining a bath or shower then the appliance and anyelectrical switch or appliance control utilising mainselectricity should be so situated that it cannot be touched bya person using the bath or shower.4 SEALED SYSTEM REQUIREMENTSCentral HeatingNote. mini HE boilers are suitable for fully pumpedpressurised sealed systems only.REQUIREMENTS1 GeneralThe installation must comply with the requirements ofBS. 6798 and BS. 5449.2 Flow TemperatureThe installation should be designed to work with flowtemperatures of up to 90 ° C.3 Working PressureAll components of the system must be suitable for a workingpressure of 3 bar (45 lb/in2) and temperature of 110 ° C. Extracare should be taken in making all connections so that therisk of leakage is minimised.The following components are incorporated within theappliance:a. Circulating pump.b. Safety valve; with a non ---adjustable pre---set lift pressure of3 bar (45lb/in2).c. Pressure gauge; covering a range of 0---4 bar.d. 6 litre expansion vessel; with an initial charge pressure of0.7 bar (10.5 lb/in2).For further details refer to BS.5449:1 and the British GasCorporation publication ’Specifications for Domestic CentralHeating and Hot Water’.4 Filling the systemFill the system through a temporary hose connection from adraw ---off tap supplied from a service pipe under mainspressure. Where the mains pressure is excessive a pressurereducing valve shall be used to facilitate filling.When installing the filling connection provided with the boileran additional WRAS approved valve must be fitted to themains water supply upstream of the double check valve tofully comply the Water RegulationsCH return Hose unions MainsWaterSupplyTemporary hose(disconnectafter filling)Stop valve Additional stop valveDouble check valveassemblyNote direction of flowSystem filling and make ---upProceed with the following:F Thoroughly flush out the whole of the system with coldwater before fitting the boiler.F Fill and vent the system until the pressure gauge registers1.5 bar (22 lb/in2). Examine for leaks.F Release water from the system until a pressure of 1 bar(15 lb/in2) is reached.To avoid getting debris on the valve seat, do not usethe safety valve to do this.F Light the boiler and heat the system to the maximumworking temperature. Examine for leaks.F Turn off the boiler and drain the system while still hot.F Refill and vent the system.F Re---pressurise the system to the desired charge pressure(see Table 5).