Ideal Boilers LOGIC COMBI C24 Installation & Servicing

Also see for LOGIC COMBI C24: User guide

16Installation and ServicingSECTION 1 - GENERALThe boiler does not normally need a bypass but atleast some radiators on the heating circuit, of loadof at least 10% of the minimum boiler output, mustbe provided with twin lockshield valves so that thisminimum heating load is always available. See noteregarding thermostatic radiator valves on page 13.Note. Systems incorporating zone valves which couldcompletely cut off the flow through the system mustalso include a bypass.BALANCING1. Set the programmer to ON.Close the manual or thermostatic valves on allradiators, leaving the twin lockshield valves (on theradiators referred to above) in the OPEN position.Turn up the room thermostat and adjust thelockshield valve to give an uninterrupted flowthrough the radiator.These valves should now be left as set.2. Open all manual or thermostatic radiator valvesand adjust the lockshield valves on the remainingradiators, to give around 20 o C temperature drop ateach radiator.3. Adjust the room thermostat and programmer toNORMAL settings.1.18 SYSTEM BALANCING1.19 WATER TREATMENTCENTRAL HEATINGThe Logic range of boilers have an ALUMINIUM alloy heatexchanger.IMPORTANT.The application of any other treatment to this productmay render the guarantee of Ideal Boilers Invalid.Ideal Boilers recommend Water Treatment in accordancewith the Benchmark Guidance Notes on Water Treatmentin Central Heating Systems.If water treatment is used Ideal Boilers recommend onlythe use of SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEYMC1, SENTINEL X100 or CALMAG CM100 inhibitors andassociated water treatment products, which must be usedin accordance with the manufacturers’ instructions.DOMESTIC HOT WATER1. It is most important that the correct concentrationof the water treatment products is maintained inaccordance with the manufacturers’ instructions.2. If the boiler is installed in an existing system anyunsuitable additives MUST be removed by thoroughcleansing. BS 7593 details the steps necessary toclean a domestic heating system.3. In hard water areas, treatment to prevent lime scalemay be necessary - however the use of artificiallysoftened water is NOT permitted.4. Under no circumstances should the boiler be firedbefore the system has been thoroughly flushed.For further information contact:Fernox Cookson ElectronicsForsyth Road, Sheerwater, Woking, Surrey GU21 5RZ+44 (0) 8706 015000Sentinel Performance SolutionsThe Heath Business & Technical ParkRuncorn, Cheshire WA7 4QXTel: 0800 389 4670Scalemaster Water Treatment ProductsEmerald Way, Stone, Staffordshire ST15 0SRTel: +44 (0) 1785 811636Calmag Ltd.Unit 3-6, Crown Works, Bradford Road,Sandbeds, Keighley, West Yorkshire BD20 5LNTel: +44 (0) 1535 210320Adey Professional Heating SolutionsGloucester Road, Cheltenham GL51 8NRTel: +44 (0) 1242 546700........ SYSTEM REQUIREMENTS - CONTDomestic Hot Water1. The DHW service must be in accordance with BS.5546 & BS.6700.2. Refer to Table 1 for minimum and maximum working pressures. Inareas of low mains water pressures the domestic hot water regulatormay be removed from the DHW flow turbine cartridge. Refer toSection 3.20. The boiler will require the flow rate to be set to obtaina temperature rise of 35 o C at the tap furthest from the boiler.3. The boilers are suitable for connection to most types of washingmachine and dishwasher appliances.4. If the shower/mixer valve does not incorporate non-return valvesthe following must be followed:a. The cold inlet to the boiler is fitted with an approved anti-vacuum or syphon non-return valve.b. Hot and cold water supplies to the shower are of equal pressure.5. Hard Water AreasWhere the water hardness exceeds 200mg/litre (200 ppm), it isrecommended that a proprietary scale reducing device is fitted into theboiler cold supply within the requirements of the local water company.IMPORTANT. Provision must be made to accommodate the expansionof DHW contained within the appliance. If the DHW inlet contains aback flow prevention device or non-return valve, e.g. a water meter,then a mini expansion vessel should be fitted between the device andthe boiler in the cold inlet pipe.Cold water, rising main and pipework in exposed areas need tobe suitably lagged to prevent freezing.Note. DHW Expansion Vessel kit available from Ideal.In hard water areas where mains water can exceed 200ppmTotal Hardness (as defined by BS 7593 Table 2) a scale reducingdevice should be fitted into the boiler cold supply within therequirements of the local water company. The use of artificiallysoftened water, however, is not permitted.Ideal Boilers recommend the use of Fernox Quantomat, SentinelCombiguard, Calmag CalPhos I scale reducing devices orScalemaster In-line Scale Inhibitor branded Ideal, which must beused in accordance with the manufacturers’ instructions.Notes.