Assessments - 4, GPA: 4.8
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2.1.1 Installation The installation of this water heater should be carried out by a suitably qualified competent person. It is a criminal offence for unqualified persons to install gas equipment. Installation should be carried out in accordance with all local authority and building regulations, local water authority and fire regulations and the following British standards: 5440, 5546, 6644, 6700, 6798 and 6891. Some chemicals produce vapours which can cause rapid failure of thermocouples, burners and storage tanks if they are drawn into the combustion air supply. Therefore if this water heater will be used to supply hot water to: -hairdressers, -dry cleaners -industrial degreasing processes or any other area where compounds containing halogens are used and stored, care should be taken that all primary and secondary air is drawn from outside atmosphere free of such contaminents. For further advise contact A.O. SMITH. 2.1.2 Water connections A.O. Smith water heaters are suitable for connection to vented, unvented and pumped pressurised systems. In each case appropriate valves and fittings should be used to ensure the system complies with the requirements of the water by laws, and appropriate building regulations. When fitting it is essential the rules of 'good practice' are applied at all stages of installation. Vented systems If the water heater is to be connected to a cold feed tank or cistern the hot water supply pipe must include an open vent which discharges over the cold feed cistern. The cold feed cistern must have an actual capacity of greater volume than the hourly recovery rate of the water heater(s) which it supplies.The minimum actual capacity is 50 gallons or 227 litres. Unvented To install an A.O. Smith water heater on an unvented cold water supply system a kit of valves and fittings listed by the water research centre and complying with part G3 of the current building regulations should be used. Installation should be carried out generally as shown on the following diagram. See Figure 4. A.O. Smith water heaters are tested to a maximum pressure of 12 bar and a maximum working pressure of 8 bar. AOS 0581 Figure 4 - Connection diagram (unvented system) 1) Manual gas valve 2) Stop valve 3) Expansion vessel 4) T&P safety valve 5) Non return valve 6) Circulation pump 7) Drain valve 8) Pressure limiting valve 9) Expansion valve A) Gas supply B) Hot water delivery C) Cold water inlet D) Hot water taps E) Return circulation 2.1.3 Gas connection The gas supply to this appliance must be installed in accordance with BS 6891 (1988). Fit the 1/2" gas supply cock supplied with this unit immediately before the gas control block. No heat or soldered joints should be applied in the vicinity of the gas control block, as they could cause damage to the control. All connections and joints should be tested for gas soundness with a suitable leak detector (do not use a naked flame). 2.1.4 Flue system The water heater should be fitted with a flue system connected to the draught diverter. The flue pipe should rise for at least 50 cm. vertically before the inclusion of any bends. If a horizontal run of flue is required this should be kept to the minimum length possible and incorporate a rise of 6 cm. per metre of run. A split clip or flange should be provided in the flue close to the draught diverter for ease of servicing. All flue materials should be corrosion resistant i.e. stainless steel or galvanised and must include a tested and approved terminal to BS 5440 part I. If the flue passes through any combustible material measures must be taken to protect against the possibility of fire. All flues must terminate in free air space approx. 1.5 metres from any vertical surface of structure i.e. chimney stacks, roof parapets, etc. If an existing chimney or flue is to be used this should be swept clean and be free of debris before an approved liner is installed and connected to the water heater. 2.1.5 Flue down draught safety device The draught diverter has already been provided with a temperature probe ex factory for signalling returning flue gases. The probe of the down draught supervision must remain installed on the draught hood. Connect the slide connectors of the down draught supervision to the thermocouple (see Figure 5) and install the head of the down draught supervision in the bracket; see Figure 5. The draught hood must be positioned in its normal place with the temperature probe at the front of the boiler. Pass the wiring of the temperature probe through the cable duct. Note The screws with which the down draught supervision has been mounted in the bracket are already in the bracket. IMD 0422 Figure 5 -Down draught supervision installation 14 2.2 Commissioning 2.2.1 Filling the water heater 1. Close the drain tap. 2. Open the cold water tap to the water heater and open all taps where hot water can be drained for deaeration. The water heater is filled as soon as cold water flows from all taps. 3. Close all hot wate...
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