COMBI A - Instruction Manual

10. Installation

10. Installation requirements Reference Standards In the United Kingdom, the installation and initial start up of the boiler must be by a CORGI Registered installer in accordance with the installation standards currently in effect, as well as with any and all local health and safety standards i.e. CORGI. In the Republic of Ireland the installation and initial start up of the appliance must be carried out by a Competent Person in accordance with the current edition of I.S.813 “Domestic Gas Installations” and the current Building Regulations, reference should also be made the the current ETCI rules for electrical installation. exposed to the free passage of external air at all times and must not be installed in a place likely to cause nuisance. It must not be allowed to discharge into another room or space such as an outhouse or closed lean-to. Condensing boilers have a tendency to form a plume of water vapour from the flue terminal due to the low temperature of the flue gasses. The terminal should therefore be located with due regard for the damage or discolouration that might occur to buildings in the vicinity and consideration must also be given to adjacent boundaries, openable windows should also be taken into consideration when siting the flue. The installation of this appliance must be in accordance with the relevant requirements of the Local Building Regulations, the current I.E.E. Wiring Regulations, the by-laws of the local water authority, in Scotland, in accordance with the Building Standards (Scotland) Regulation and Health and Safety document No. 635, “Electricity at Work Regulations 1989” and in the Republic of Ireland with the current edition of I.S. 813 and the Local Building Regulations (IE). E E Fig. 11 For detailed information on the installation of Condensing boilers, reference should be made to the ODPM Guide to the Condensing Boiler Assesment Procedure for Dwellings. C.O.S.H.H. Materials used in the manufacture of this appliance are nonhazardous and no special precautions are required when servicing. Codes of Practice Installation should also comply with the following British Standards Codes of Practice: BS 7593:1992 Treatment of water in domestic hot water central heating systems BS 5546:2000 Installation of hot water supplies for domestic purposes BS 5440-1:2000 Flues BS 5440-2:2000 Air Supply BS 5449:1990 Forced circulation hot water systems BS 6798:2000 Installation of gas fired hot water boilers of rated input not exceeding 70kW BS 6891:2000 Installation of low pressure gas pipe up to 28mm BS 7671:2001 IEE Wiring Regulations BS 4814:1990 Specification for expansion vessels BS 5482:1994 Installation of L.P.G. and in the Republic of Ireland in accordance with the following codes of practice: I.S. 813 Domestic Gas Installations Avoid installing the boiler where the air inlet can be polluted by chemical products such as chlorine (swimming pool area), or ammonia (hair-dresser), or alkaline products (launderette) Flue Detailed information on flue assembly can be found in Section 12 “Connecting the flue”. The boiler must be installed so that the flue terminal is The minimum acceptable clearances are shown below: A - Directly below an open window or other opening 300 B - Below gutters, solid pipes or drain pipes 75 C - Below eaves 200 D - From vertical drain pipes and soil pipes 75 E - From internal or external corners 300 F - Above ground on a public walkway or patio 2100 G - From a surface facing a terminal 2500 H - From a terminal facing a terminal 2500 I - Vertically from a terminal in the same wall 1500 J - Horizontally from a terminal in the same wall 300 K - Horizontally from an opening window 300 L - Fixed by vertical flue terminal NOTE: THE FLUE MUST NOT BE INSTALLED IN A PLACE LIKELY TO CAUSE A NUISANCE. It may be necessary to protect the terminal with a guard, if this is the case it will be necessary to purchase a stainless steel terminal guard. Reference should be made to the Building Regulations for guidance. Ventilation The room in which the boiler is installed does not require specific ventilation. If it is installed in a cupboard or compartment permanent ventilation is not required for cooling purposes. Gas Supply The gas installation and soundness testing must be in accordance with the requirements of BS 6891. Ensure that the pipe size is adequate for demand including other gas appliances on the same supply. 14

10. Installation requirements (continued) Electrical Supply All electrical work carried out must be in accordance with all current local Building Regulations and British Standards. The appliance requires an earthed 230V - 50 Hz supply and must be in accordance with current I.E.E. It must also be possible to be able to completely isolate the appliance electrically. Connection should be via a 3 amp fused doublepole isolating switch with contact separation of at least 3 mm on both poles. Alternatively, a fused 3 Amp. 3 pin plug and unswitched socket may be used, provided it is not used in a room containing a bath or shower. It should only supply the appliance. The boiler is suitable for sealed systems only. The maximum working pressure for the appliance is 6 bar. All fittings and pipework connected to the appliance should be of the same standard. If there is a possibility of the incoming mains pressure exceeding 6 bar, particularly at night, then a suitable pressure limiting valve must be fitted. The boiler is designed to provide hot water on demand to multiple outlets within the property. If there is a requirement for greater demands, for example if the property has several bathrooms and cloakrooms, a vented or unvented hot water storage system may be used. Showers Any shower valves used with the appliance should be of a thermostatic or pressure balanced type. Refer to the shower manufacturer for performance guidance and suitability. Flushing and Water Treatment The boiler is equipped with a stainless steel heat exchanger. The detailed recommendations for water treatment are given in BS 7593:1992 (Treatment of water in domestic hot water central heating systems); the following notes are given for general guidance; If the boiler is installed on an existing system, any unsuitable additives must be removed; Under no circumstances should the boiler be fired before the system has been thoroughly flushed; the flushing procedure must be in line with BS7593:1992. We highly recommend the use of a flushing detergent appropriate for the metals used in the circuit, whose function is to dissolve any foreign matter that may be in the system. In hard water areas or where large quantities of water are in the system the treatment of the water to prevent premature scaling of the main heat exchanger is necessary. The formation of scale strongly compromises the efficiency of the thermic exchange because small areas of scale cause a high increase of the temperature of the metallic walls and therefore add to the thermal stress of the heat exchanger. Demineralised water is more aggressive so in this situation it is necessary to treat the water with an appropriate corrosion inhibitor. Any treatment of water by additives in the system for frost protection or for corrosion inhibition has to be absolutely suitable for all the metals used in the circuit. The use of a corrosion inhibitor in the system is recommended to prevent corrosion (sludge) damaging the boiler and system; If anti-freeze substances are to be used in the system, check carefully that they are compatible with the metals used in the circuit. MTS suggests the use of suitable anti-freeze products, which will prevent rust and incrustation taking place. Periodically check the pH of the water/anti-freeze mixture of the boiler circuit and replace it when the amount measured is out of the range stipulated by the manufacturer ( 7 < pH < 8). DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE In under-floor systems, the use of plastic pipes without protection against penetration of oxygen through the walls can cause corrosion of the systems metal parts (metal piping, boiler, etc), through the formation of oxides and bacterial agents. To prevent this problem, it is necessary to use pipes with an “oxygen-proof barrier”, in accordance with standards DIN 4726/4729. If pipes of this kind are not used, keep the system separate by installing heat exchangers of those with a specific system water treatment. IMPORTANT Failure to carry out the water treatment procedure will invalidate the appliance warranty. System Controls The boiler is electrically controlled and is suitable for most modern electronic time and temperature controls. The addition of such external controls can be beneficial to the efficient operation of the system, please refer to local Building Regulations for further advice. The boiler connections for external controls are 12V DC and so only controls of 12V DC that have voltage free contacts should be used. (Section 13 Electrical Connections - page 26). Location The boiler can be installed on any suitable internal wall. Provision must be made to allow the correct routing of the flue and siting of the terminal to allow the safe and efficient removal of the flue products. A compartment or cupboard may be used provided that it has been purpose-built or modified for the purpose. It is not necessary to provide permanent ventilation for cooling purposes. Detailed recommendations are given in BS 5440 pt 2. If it is proposed that it is installed in a timber framed building then reference should be made to British Gas Document DM2, or advice sought from CORGI. Where a room sealed appliance is installed in a room containing a bath or shower, the appliance and any electrical switch or appliance control, utilising mains electricity should be situated specifically in accordance with current IEE Wiring Regulations. For unusual locations, special procedures may be necessary. BS 6798:2000 gives detailed guidance on this aspect. Condensate Discharge The condensate discharge hose from the boiler must have a continuous fall of 2.5 o and must be inserted by at least 50mm into a suitable acid resistant pipe - e.g. plastic waste or 15