Baxi Megaflo 2 System 12 Compact GA Installation & Servicing Instructions Manual Download

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Megaflo 2 System Compact GA

Range

Gas Fired Wall Mounted Condensing

System Boiler

Installation & Servicing Instructions

These instructions include the Benchmark Commissioning Checklist

and should be left with the user for safe keeping.

Summary of Contents for Megaflo 2 System 12 Compact GA

Page 1: ...gaflo 2 System Compact GA Range Gas Fired Wall Mounted Condensing System Boiler Installation Servicing Instructions These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping ...

Page 2: ...out installation commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and Howitzer Industry Council who manage and promote the Scheme Visit www centralisation co UK for more information 0086 ISO 9001 FLEM 00866 Building Regulations and the Benchmark Commissioning Checklist Building Regulations England Wales require notification of t...

Page 3: ...elevant LABC You must ensure that the certificate number issued by the Gas Safe Register is written onto the Benchmark Checklist Scheme Members only Call Gas Safe Register on 0800 408 5577 or log onto www gassaferegister co uk within 10 days If you notify via the Gas Safe Register the register will issue the Building Regulations certificate on members behalf Complete the Benchmark Checklist Instal...

Page 4: ...ccordance with the current edition of I S 813 Domestic Gas Installations the current Building Regulations and reference should be made to the current ETCI rules for electrical installation All systems must be thoroughly flushed and treated with inhibitor see section 6 2 In GB the following Codes of Practice apply Standard Scope BS 6891 Gas Installation BS 5546 Installation of hot water supplies fo...

Page 5: ...s clear and unobstructed If possible avoid steps wet or slippery surfaces unlit areas etc and take special care on ladders into lofts Technique When handling or lifting always use safe techniques keep your back straight bend your knees Don t twist move your feet avoid bending forwards and sideways and keep the load as close to your body as possible Where possible transport the boiler using a sack ...

Page 6: ...s 11 6 0 System Details 12 7 0 Site Requirements 14 8 0 Flue 20 9 0 Installation 22 10 0 Commissioning 27 11 0 Completion System Draining 29 12 0 Servicing 30 13 0 Changing Components 32 14 0 Combustion Calibration 39 15 0 Electrical 40 16 0 Short Parts List 41 17 0 Fault Finding 42 18 0 32 kW Model Supplement 47 Benchmark Checklist 50 Section Page ...

Page 7: ...lso shown on the information label behind the boiler control flap Fig 1 This is for user reference 7 The boiler is intended to be installed in residential commercial light industrial E M C environments on a governed meter supply only 8 The boiler must be installed with one of the purpose designed flues such as one of the standard horizontal telescopic flue kits detailed in the Flue Installation Gu...

Page 8: ... Air Vent 6 Central Heating System Pressure Gauge 7 Fan Assembly 8 Flame Sensing Electrode 9 Air Gas Collector 10 Spark Ignition Electrode 11 Combustion Box Cover Burner 12 Condensate Trap 13 Safety Pressure Relief Valve 14 Boiler Control 15 Gas Valve 16 Boiler Drain Tap 17 Control Box Display 18 Heating Flow Sensor 19 Safety Thermostat 2 3 4 5 7 10 8 11 12 13 15 14 6 9 16 17 18 19 1 ...

Page 9: ...tandby signal 2 When the boiler temperature falls below 5 C the boiler will fire until a temperature of 30 C is reached 3 Further protection can be incorporated by using a system frost thermostat 3 3 Pump Protection 1 If the boiler has been inactive for a period of 24 hours the pump will automatically operate for 1 minute to prevent sticking Key 1 Pump with Automatic Air Vent 2 CH System Pressure ...

Page 10: ...To accept 21 5mm 3 4 in plastic waste pipe External Fuse Rating 3A Heat Input CH Net Max Min 12 model kW 12 2 1 15 model kW 15 2 2 18 model kW 18 2 6 24 model kW 24 3 5 28 model kW 28 4 1 Heat Output CH Non Condensing Max Min 12 model kW 12 2 15 model kW 15 2 1 18 model kW 18 2 5 24 model kW 24 3 4 28 model kW 28 4 Appliance Category CAT I 2H 3P Appliance Type C13 C33 C43 C53 Heat Output CH Conden...

Page 11: ...let 22mm Heating Return 22mm Pressure Relief Valve 15mm Condensate Drain Boiler Side Boiler Side 130 mm 25 mm 130 mm 65 mm 40 mm 162 5 mm Tap Rail Dimensions A 700mm B 300 mm This can be reduced to 290mm by removing the boiler control access flap C 390mm D 116mm Ø Min E 160mm 207mm for 80 125mm flue systems F 130mm G 106mm H 228mm J 162mm ...

Page 12: ...ernox 0870 870 0362 Failure to flush and add inhibitor to the system will invalidate the appliance warranty 4 It is important to check the inhibitor concentration after installation system modification and at every service in accordance with the inhibitor manufacturer s instructions Test kits are available from inhibitor stockists 5 For information or advice regarding any of the above contact Tech...

Page 13: ...t operation for system capacities up to 100 litres 32 kW model 155 litres For greater system capacities an additional expansion vessel must be fitted For GB refer to BS 7074 Pt 1 For IE the current edition of I S 813 Domestic Gas Installations 6 6 Safety Pressure Relief Valve Fig 6 1 The pressure relief valve is set at 3 bar therefore all pipework fittings etc should be suitable for pressures in e...

Page 14: ...Gas Installations and the current ETCI rules 4 If the boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engineers Publication IGE UP 7 Gas Installations in Timber Framed Housing 7 2 Clearances Figs 8 9 1 A flat vertical area is required for the installation of the boiler 2 These dimensions include the necessar...

Page 15: ...current edition of ETCI rules 2 The mains supply is 230V 50Hz fused at 3A NOTE The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance Connection may be via a fused double pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only 7 6 Bath Shower Rooms 1 If the boiler is fitted in ...

Page 16: ...diameter and must be supported using suitably spaced clips of the correct design to prevent sagging 6 It is advisable that the full length of condensate pipe is run internally and preferably be less than 3 metres 7 Internal runs greater than 3 metres or runs in cold areas should use 32mm waste pipe 8 External runs MUST be a MINIMUM of 32mm and fully insulated with material suitable for external us...

Page 17: ... emptied then back pressure may force water out of the boiler trap and cause appliance lockout Boiler 2 5 Minimum fall iii Termination to a drain or gully Boiler 500mm min 2 5 Minimum fall iv Termination to a purpose made soakaway Holes in the soak away must face away from the building 50mm per metre of pipe run 50mm per metre of pipe run Further specific requirements for soakaway design are refer...

Page 18: ...ce Heating Element is NOT a substitute for correct installation of the condensate drain ALL requirements in this section must still be adhered to Boiler vi pumped into an external soil vent pipe 2 5 Minimum fall 50mm per metre of pipe run Condensate Pump Unheated Location e g Garage Basement or similar heated Boiler 2 5 Minimum fall 50mm per metre of pipe run Pipe must terminate above water level ...

Page 19: ...elow Opening Window or Door 150mm MIN IMPORTANT If fitting a Plume Displacement Flue Kit the air inlet must be a minimum of 150mm from any opening windows or doors see Section 9 0 Plume Displacement Kit Air Inlet Fig 13 Terminal Position with Minimum Distance Fig 12 mm A1 Directly below an opening air brick opening windows etc 300 B1 Above an opening air brick opening window etc 300 C1 Horizontall...

Page 20: ...equivalent flue lengths are 60 100 80 125 Horizontal Concentric 10 metres 20 metres 4 Any additional in line bends in the flue system must be taken into consideration Their equivalent lengths are Concentric Pipes 135 bend 0 5 metres 93 bend 1 0 metres 5 The elbow supplied with the standard horizontal telescopic flue kit is not included in any equivalent length calculations NOTE Flue length is meas...

Page 21: ... Guard Fig 15 1 When codes of practice dictate the use of terminal guards Multifit accessory part no 720627901 can be used Note This is not compatible with Flue Deflector referred to below 2 If a proprietary guard is used it must be identified as suitable for use with condensing boilers 3 There must be a clearance of at least 50mm between any part of the terminal and the guard 4 The flue terminal ...

Page 22: ...ve staples open flaps and remove the cardboard sheet Remove the polystyrene side pieces and literature Two people can then lift out the boiler Fig 17 2 After considering the site requirements see Section 7 0 position the fixing template on the wall ensuring it is level both horizontally and vertically 3 Mark the position of the two most suitable fixing slots for the wall plate and boiler lower fix...

Page 23: ... pressure relief valve The relief valve is intentionally angled to the right of the boiler DO NOT adjust the position of the valve The discharge pipe must be installed before pressurising the system 3 The pipework must be at least 15mm diameter and run continuously downwards to a discharge point outside the building See section 6 6 for further details 4 Utilising one of the sealing washers connect...

Page 24: ...dimension will be known as X Fig 25 5 If the distance from the flue elbow to the outside face of the wall X in Fig 25 is less than 250mm the Connection Assembly can be discarded and the Terminal Assembly fitted directly into the elbow 6 In instances where the dimension X Fig 25 is between 250mm and 315mm it will be necessary to shorten the Terminal Assembly by careful cutting to accommodate walls ...

Page 25: ...e to ease assembly of the elbow and flue Fig 30 15 Ensure that the terminal is positioned with the slots to the bottom Fig 31 Secure the flue to the elbow with the screws supplied Fig 30 IMPORTANT It is essential that the flue terminal is fitted as shown to ensure correct boiler operation and prevent water entering the flue 16 Make good between the wall and air duct outside the building appropriat...

Page 26: ...nut and refit the grommet 5 Connect the Earth Permanent Live and Neutral wires to the terminal strip NOTE Both the Permanent Live and Neutral connections are fused 6 Refer to the instructions supplied with the external control s IMPORTANT The room thermostat MUST be suitable for 230V switching 7 Remove the link between terminals 1 2 The switched output from the external control must be connected t...

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Baxi Megaflo 2 System 12 Compact GA, Installation & Servicing Instructions Manual

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