COMBI A - Instruction Manual

10. Installation

10. Installation requirements (continued) overflow pipe. The condensate discharge pipe must have a minimum diameter of 22mm, must have a continuous fall and preferably be installed and terminated to prevent freezing. The discharge pipe must be terminated in a suitable position: i) Connecting into an internal soil stack (at least 450mm above the invert of the stack). A trap giving a water seal of at least 75mm must be incorporated into the pipe run, there also must be an air break upstream of the trap. ii) Connecting into the waste system of the building such as a washing machine or sink trap. The connection must be upstream of the washing machine/sink. If the connection is down stream of the waste trap then an additional trap giving a minimum water seal of 75mm and an air break must be incorporated in the pipe run, as above. iii) Terminating into a gully, below the grid level but above the water level. iv) Into a soakaway. NOTE: If any condensate pipework is to be installed externally then it should be kept to a minimum and be insulated with a waterproof insulation and have a continuous fall. The total length of external pipe used should not exceed 3 metres. Some examples of the type of condensate terminations can be found below. 1. Internal termination of condensate drainage pipe to internal stack 2. External termination of condensate drainage pipe via internal discharge branch (e.g. sink waste) and condensate siphon 3. External termination of condensate drainage pipe via internal discharge branch (e.g. sink waste - proprietary fitting). 4. External termination of condensate drainage pipe via condensate siphon 16

11. Installing the boiler Please check that you are familiar with the installation requirements before commencing work (Section 10). The installation accessories described in the following list are included in the boiler packaging: - Hanging bracket - A paper template (showing the dimensions of the boiler with 5 mm side clearances) - Connection tails and valves - Screws and washers - Connection washers - Installation, Servicing and Operating Instructions Method of positioning the boiler on the wall. The paper template can be used to ensure the correct positioning of kitchen cabinets etc. It also details the commissioning instructions. The paper template has to be fixed to the wall and used to locate the position of the hanging bracket and the centre for the flue hole. Drill and plug the wall and secure the hanging bracket using the screws provided. Remove the boiler from its packaging as shown in Fig. 16 and unscrew the two clamp locking bolts A and remove the casing (Fig. 13). Place the boiler on the wall on the hanging bracket (Fig. 14). NOTE: THE APPLIANCE MUST NOT BE FITTED ON A COMBUSTIBLE WALL SURFACE. Connecting the boiler to the system - Remove the boiler casing as described in Section 18. - Push in the tabs “P” (Fig. 14) on either side of the boiler and pivot the electrical box forward to gain access to the valve connections - Remove the caps and connect the boiler to the taps using the washers provided in the plastic bag. 4 x fibre washers for the C/H flow and return, hot water outlet and cold water inlet connections 1 x rubber washer for gas connection Safety valve discharge The pressure relief valve tube is made of copper. It should terminate below the boiler safely outside the premises. Care should be taken that it does not terminate over an entrance or window or where a discharge of heated water could endanger occupants or passers by. Fill the Central Heating and DHW system and bleed air from the system as described in Section 14. The system should be carefully checked for leaks, as frequent refilling could cause premature system corrosion or unnecessary scaling of the heat exchanger. The pipe from the condense trap (11 Fig. 5) should be connected to a drain as described in the relevant British regulations. Pay special attention to not bend the condensate silicone drain pipe such as the flow will be interrupted. Please use exclusively drain pipe material compatible with condensate products. (refer to BS 6798 : 2000) The condensate flow can reach 2 litres / hour; because of the acidity of the condensate products (Ph close to 2), take care before operation. Fitting the Horizontal Flue Attention ! Before starting the boiler, the condensate trap (11 Fig. 5) must be filled with water. Before fitting the flue l onto the boiler, pour 1/4 litre of water in the exhaust pipe as shown in Fig. 16. Instructions on fitting the flue can be found in Section 12. IMPORTANT!! Use only the specific condensation flue kit supplied by MTS. 17