Ideal Boilers Concord CXD 40-100 Installation & Servicing Manual

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Ideal Boilers Concord CXD 40-100 Installation & Servicing Manual Manual pdf 8 page image

8 Concord CXD - Installation4 SEALED (PRESSURISED) SYSTEMSWorking pressure 4.5 bar maximum.Particular reference should be made to BS. 6644: Section 2;Subsection 11 and Guidance note PM5 "Automatically controlledsteam and hot water boilers" published by the Health and SafetyExecutive.The information and guidance given below is not intended tooverride any requirements of either of the above publications orthe requirements of the Local Authority, gas or water undertakings.In general commercial closed pressurised systems are providedwith either manual or automatic water make up.On both instances it will be necessary to fit automatic controlsintended to protect the boiler, circulating system and ancillaryequipment by shutting down the boiler plant if a potentiallyhazardous situation should arise.Examples of such situations are low water level and operatingpressure or excessive pressure within the system. Dependingon circumstances controls will need to be either manual orautomatic reset. In the event of shut down both visual and audibleGENERALalarms may be necessary.Pressure vessels used must comply with BS. 4814 and must besized on the basis of the total system volume and initial chargepressure.Initial minimum charge pressure should not be less than 0.5 bar(7.2 psi) and must take account of static head and specificationof the pressurising equipment. The maximum water temperaturespermissible at the point of minimum pressure in the system isspecified in Guidance Note PM5.When make up water is not provided automatically it will benecessary to fit controls which shut down the plant in the eventof the maximum system pressure approaching to within 0.35bar (5 psi) if safety valve setting.Other British Standards applicable to commercial sealedsystems are:-BS. 6880: Part 2.BS. 1212BS. 6281: Part 1BS. 6282: Part 1BS. 6283: Part 4relevant requirements of the local gas supplier, local authorityand the relevant British Standard Codes of practice and buildingregulations.These appliances are NOT suitable for installation where they willbe exposed to the elements. A boiler room shall be constructed oradapted to meet the requirements of BS 6644.The maximum ambient temperature is 32 0C at 1.5 metres fromthe floor with a maximum humidity of 90% RH.FOR SMALL PIPE INSTALLATIONS;BS. 6891; Installation of low pressure pipeworkFOR LARGE PIPE INSTALLATIONS:British Gas Publications:IGE-UP-1: Purging Procedures of Non-domestic GasInstallations. Soundness Testing Procedures forIndustrial and Commercial .IM11: Flues for Commercial and Industrial Gas Fired Boilersand Air Heaters.Gas InstallationsIGE-UP-2: Guidance notes on the Installation of Gas Pipework,Boosters and Compressors in Customer’s PremisesEqual to or Greater than 25mm (Non-domestic).BS.6644: Installation of Gas Fired Hot Water Boilers 60kW to2MW.CP341: Water Supply.CP342:2: Centralised Hot Water Supply.Model Water Byelaws.Manufacturers notes must not be taken, in any way, as overridingstatutory obligations.The appliance must be installed in a room separated from livingrooms and provided with appropriate ventilation direct to the outside- see Table 6.atmosphere if proper venting and expansion of system water is tobe achieved. The same tank is used to fill the system with waterand it is through the cold feed pipe that system water expandsinto the tank when the boiler passes heat into the system.Conversely, when the system cools, water previously expelled isdrawn back from the tank into the system together with a quantityof dissolved oxygen.Even if leakage from the heating and hot water system is eliminatedthere will be evaporation losses from the surface of the tank which,depending upon ambient temperature, may be high enough toevaporate a large portion of the system water capacity over a fullheating season.There will always be corrosion within a heating or hot water systemto a greater or lesser degree, irrespective of water characteristics,unless the initial fill water from the mains is treated. Even thewater in closed systems will promote corrosion unless treated. Forthe reason stated, Caradon Plumbing Limited stronglyrecommend that when necessary the system is thoroughly cleaned,prior to the use of stable inhibitor, which does not require continualtopping up to combat the effects of hardness salts and corrosionon the heat exchangers of the boiler and associated systems.Caradon Plumbing Limited advise contact directly with specialistson water treatment such as:Fernox Manufacturing Co. Ltd., or Sentinel Division,Tandem House, Marlowe Way, Betz Dearborn Ltd.,Croydon, Surrey CRO 4XS Widnes,Cheshire, WA8 8UDTel 0870 5601 5000 Tel. 0151 424 5351INSTALLATION REQUIREMENTSThe appliance must be installed by a CORGI registered installeridentified by .The installation of the boiler must be in accordance with therelevant requirements of the Gas Safety Regulations, currentI.E.E. (BS. 7671) Regulations, Model Water Bye-laws, localwater authority bye-laws and it should also comply with any