Assessments - 4, GPA: 4.3
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27). 20. Using a suitable bit (e.g. 2mm), drill through the extension and outlet. Secure using two of the screws supplied. 21. The remaining screw must be used to secure the adaptor to the concentric terminal. 22. When the plume outlet is positioned under a balcony or other projection (Fig. 28) it must protrude at least 200mm (it is not necessary to extend it further than this). 23. When under balconies or projections it is permissible to rotate the concentric flue length up to 70°, clockwise or anti-clockwise (Fig. 29), if there is insufficient space to connect vertically. 24.This will allow the connection of the exhaust to the outlet spigot. 25. All other minimum & maximum dimensions must be adhered to, and the air inlet positioned such that it will not be subjetc to rain entry. 70° Fig. 29 Concentric Flue Length (shown end-on) Outlet Spigot 26 © Baxi Heating UK Ltd 2007 10.0 Installation 190mm For Side Flue Exit Fig. 30 Flushing Tube Fig. 31 Wall Plate 10.1 Initial Preparation The gas supply, gas type and pressure must be checked for suitability before connection (see Section 7.4). 1. After considering the site requirements (see Section 7.0) position the fixing template on the wall ensuring it is level both horizontally and vertically. 2. Mark the position of the two most suitable fixing slots for the wall plate and boiler lower fixing holes. It is preferable to use the horizontal fixing slots. 3. Mark the position of the centre of the flue hole (rear exit). For side flue exit, mark as shown (Fig. 30). 4. Note the shaded area on the template. Pipework may be routed upwards behind the boiler, providing it does not conflict with the shaded area. 5. If required, mark the position of the gas and water pipes. Remove the template. 6. Cut the hole for the flue (minimum diameter 116mm). 7. Drill the wall as previously marked to accept the wall plugs supplied. Secure the wall plate using the fixing screws. 8. Using a spirit level ensure that the plate is level before finally tightening the screws. 9. Connect the gas and water pipes to the valves on the wall plate using the copper tails supplied. Ensure that the sealing washers are fitted between the connections. 10.2 Flushing 1. Connect a tube to the central heating flow or return pipe (Fig. 31). 2. Flush thoroughly (see System Details, Section 6.2). 10.3 Preparing The Boiler 1. Remove all packaging. 2. Stand the boiler on its base by using the rear lower edge as a pivot. NOTE: A small amount of water may drain from the boiler in the upright position. Central Heating Return © Baxi Heating UK Ltd 2007 10.0 Installation 28 © Baxi Heating UK Ltd 2007 10.4 Fitting The Boiler 1. Remove the sealing caps from the boiler connections. 2. Lift the boiler using the lower edges. Engage the slots at the top rear of the boiler on the wall plate (Fig. 32). 3. Insert the sealing washers between the valves and pipes on the wall plate and the boiler connections. The rubber washers must be used on the gas connection. 4. Tighten all the connections. 10.5 Fitting the Pressure Relief Discharge Pipe (Fig. 33) 1. Remove the discharge pipe from the kit. 2. Determine the routing of the discharge pipe in the vicinity of the boiler. Make up as much of the pipework as is practical, including the discharge pipe supplied. 3. The pipework must be at least 15mm diameter and run continuously downwards to a discharge point outside the building. See section 6.7 for further details. 4. Utilising one of the sealing washers, connect the discharge pipe to the adaptor and tighten the nut. 5. Complete the discharge pipework and route it to the outside discharge point. IMPORTANT: Make all soldered joints before connecting to the pressure relief valve. 10.6 Condensate Drain (see section 7.6) 1. Connect the condensate drain using the 1” BSP nut and seal supplied. Ensure the discharge of condensate complies with any national or local regulations in force (see British Gas “Guidance Notes for the Installation of Domestic Gas Condensing Boilers”. 2. The condensate outlet terminates in a 1” BSP nut and seal for the connection of 21.5mm (3/4in) plastic overflow pipe which should generally discharge internally into the household drainage system. If this is not possible, discharge into an outside drain is acceptable. Fig. 33 Fig. 32 Pressure Relief Valve Wall Plate Discharge Pipe 10.0 Installation 10.0 Installation 10.7 Fitting The Flue Fig. 34 100mm 685mm HORIZONTAL FLUE 1. The standard flue is suitable for lengths between 100mm minimum and 685mm maximum, as measured from the edge of the flue elbow outlet to the joint between the terminal and air duct (Fig. 34). 2. Locate the flue elbow on the adaptor at the top of the boiler. Set the elbow to the required orientation (Fig. 35). NOTE: The flue elbow is angled at 91.5 degrees to ensure a fall back to the boiler. 3. Measure the distance from the outside wall face to the elbow. This dimension will be known as ‘X’ (Fig. 36). 4. To dimension ‘X’ add 50mm. This dimensio...