installation GAS GAS Safety Valve Discharge: The discharge should terminate facing downward on the exterior of the building in a position where discharging (possibly boiling water & steam) will not create danger or nuisance, but in an easily visible position, and not cause damage to electrical components and wiring. The discharge must not be over an entrance or a window or any other type of public access. Air Release Points: These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system. The appliance has an integral sealed expansion vessel to accommodate the increase of water volume when the system is heated. It can accept up to 8 litres (1.8 gal) of expansion water. If the heating circuit has an unusually high water content, calculate the total expansion and add an additional sealed expansion vessel with adequate capacity. This should be located on the return pipe work as close as possible to the pump inlet. Fig. 9 Residual Head of the Boiler ΔT 20°C mbar 500 450 400 350 300 250 200 150 100 50 0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 l/h Fig. 10 Mains Water Feed - Central Heating: A method for initially filling the heating system is supplied with the connection kit. The filling loop is connected between the cold water inlet and the central heating flow connections, and incorporates a nonreturn valve. To operate the filling loop, it is necessary to open both quarter turn handles, once the required pressure has been achieved, close both handles and disconnect the hose in accordance with water byelaws. Note: The installer should ensure that there are no leaks as frequent filling of the heating system can lead to premature scaling of the main exchanger and failure of hydraulic components. Domestic Water: The domestic water must be in accordance with the relevant recommendation of BS 5546:1990. Copper tubing to BS EN 1057:1996 is recommended for water carrying pipe work and must be used for pipe work carrying drinking water, a scale reducer should also be used to reduce the risk of scale forming in the domestic side of the heat exchanger. 12
installation Flue Connections Flue System The provision for satisfactory flue termination must be made in accordance with BS 5440-1. The appliance must be installed so that the flue terminal is exposed to outside air. The terminal must not discharge into another room or space such as an outhouse or lean-to. It is important that the position of the terminal allows a free passage of air across it at all times. The terminal should be located with due regard for the damage or discolouration that might occur on buildings in the vicinity and consideration must be given to adjacent boundaries. In cold or humid weather water vapour may condense on leaving the flue terminal. The effect of such “pluming” must be considered. If the terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be fitted. When ordering a terminal guard, quote the appliance model number. The minimum acceptable spacing from the terminal to obstructions and ventilation openings are specified in Fig. 11. Fig. 11 TERMINAL POSITION mm A - Directly above or below an openable window or other opening 300 B - Below gutters, solid pipes or drain pipes 75 C - Below eaves 200 D - Below balconies or car-port roof 200 E - From vertical drain pipes and soil pipes 150 F - From internal or external corners 300 G - Above ground or balcony level 300 H - From a surface facing a terminal 600 I - From a terminal facing a terminal 1200 J - From an opening in the car port (e.g. door, window) into dwelling 1200 K - Vertically from a terminal in the same wall 1500 L - Horizontally from a terminal in the same wall 300 M - Horizontally from an opening window 300 N - Fixed by vertical flue terminal NOTE: THE FLUE MUST NOT TERMINATE IN A PLACE LIKELY TO CAUSE NUISANCE. 13
installation GAS GAS Safety Valve Discharge: The discharge should terminate facing downward on the exterior of the building in a position where discharging (possibly boiling water & steam) will not create danger or nuisance, but in an easily visible position, and not cause damage to electrical components and wiring. The discharge must not be over an entrance or a window or any other type of public access. Air Release Points: These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system. The appliance has an integral sealed expansion vessel to accommodate the increase of water volume when the system is heated. It can accept up to 8 litres (1.8 gal) of expansion water. If the heating circuit has an unusually high water content, calculate the total expansion and add an additional sealed expansion vessel with adequate capacity. This should be located on the return pipe work as close as possible to the pump inlet. Fig. 9 Residual Head of the Boiler ΔT 20°C mbar 500 450 400 350 300 250 200 150 100 50 0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 l/h Fig. 10 Mains Water Feed - Central Heating: A method for initially filling the heating system is supplied with the connection kit. The filling loop is connected between the cold water inlet and the central heating flow connections, and incorporates a nonreturn valve. To operate the filling loop, it is necessary to open both quarter turn handles, once the required pressure has been achieved, close both handles and disconnect the hose in accordance with water byelaws. Note: The installer should ensure that there are no leaks as frequent filling of the heating system can lead to premature scaling of the main exchanger and failure of hydraulic components. Domestic Water: The domestic water must be in accordance with the relevant recommendation of BS 5546:1990. Copper tubing to BS EN 1057:1996 is recommended for water carrying pipe work and must be used for pipe work carrying drinking water, a scale reducer should also be used to reduce the risk of scale forming in the domestic side of the heat exchanger. 12
installation Flue Connections Flue System The provision for satisfactory flue termination must be made in accordance with BS 5440-1. The appliance must be installed so that the flue terminal is exposed to outside air. The terminal must not discharge into another room or space such as an outhouse or lean-to. It is important that the position of the terminal allows a free passage of air across it at all times. The terminal should be located with due regard for the damage or discolouration that might occur on buildings in the vicinity and consideration must be given to adjacent boundaries. In cold or humid weather water vapour may condense on leaving the flue terminal. The effect of such “pluming” must be considered. If the terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be fitted. When ordering a terminal guard, quote the appliance model number. The minimum acceptable spacing from the terminal to obstructions and ventilation openings are specified in Fig. 11. Fig. 11 TERMINAL POSITION mm A - Directly above or below an openable window or other opening 300 B - Below gutters, solid pipes or drain pipes 75 C - Below eaves 200 D - Below balconies or car-port roof 200 E - From vertical drain pipes and soil pipes 150 F - From internal or external corners 300 G - Above ground or balcony level 300 H - From a surface facing a terminal 600 I - From a terminal facing a terminal 1200 J - From an opening in the car port (e.g. door, window) into dwelling 1200 K - Vertically from a terminal in the same wall 1500 L - Horizontally from a terminal in the same wall 300 M - Horizontally from an opening window 300 N - Fixed by vertical flue terminal NOTE: THE FLUE MUST NOT TERMINATE IN A PLACE LIKELY TO CAUSE NUISANCE. 13
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