Baxi Megaflo 2 System Compact GA Range Installation & Servicing Instructions Manual

Megaflo 2 system compact ga series gas fired wall mounted condensing system boiler

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Technical manual (36 pages)

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Page 2 UK and to encourage the regular servicing of all central heating systems to ensure safety and efficiency. © Baxi Heating UK Ltd 2013 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, or stored in any...
Page 3: Installer Notification Guidelines
Benchmark Checklist ‘Gas Safe Register’ will issue a LABC will record the data Building Regulations Compliance and will issue a Certificate to the property owner certificate of compliance and inform the relevant LABC © Baxi Heating UK Ltd 2013...
Page 4 BS EN 12831 Heating systems in buildings - Method for calculation of the design heat load BS EN 14336 Heating systems in buildings - Installation and commissioning of water-based heating systems © Baxi Heating UK Ltd 2013...
Page 5 If at any time when installing the boiler you feel that you may have injured yourself STOP !! DO NOT ‘work through’ the pain - you may cause further injury. IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER - OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !! © Baxi Heating UK Ltd 2013...
Page 6: Table Of Contents
Flue Installation 10.0 Commissioning 11.0 Completion & System Draining 12.0 Servicing 13.0 Changing Components 14.0 Combustion & Calibration 15.0 Electrical 16.0 Short Parts List 17.0 Fault Finding 18.0 32 kW Model Supplement Benchmark Checklist © Baxi Heating UK Ltd 2013...
Page 7: Introduction
- these are detailed in Section 18.0 ‘32 kW Model Supplement’ 1. The Baxi Megaflo 2 System Compact GA Range are fully automatic gas fired wall mounted condensing system boilers. They are room sealed and fan assisted.
Page 8: General Layout
Flame Sensing Electrode Air/Gas Collector Spark Ignition Electrode Combustion Box Cover & Burner Condensate Trap Safety Pressure Relief Valve Boiler Control Gas Valve Boiler Drain Tap Control Box Display Heating Flow Sensor Safety Thermostat © Baxi Heating UK Ltd 2013...
Page 9: Appliance Operation
9. Gas Valve 20. Fan 10. Safety Thermostat (105°C) 21. Air-Gas Venturi 11. Heating Flow Sensor 22. Expansion Vessel Connections:- A – Condensate Drain B – Heating Flow C – Gas Inlet D – Heating Return © Baxi Heating UK Ltd 2013...
Page 10: Technical Data
The test data from which it has been calculated has been certified by 0087. NOTE: All data in this section are nominal values and subject to normal production tolerances. 1000 1200 Flow Rate (l/h) © Baxi Heating UK Ltd 2013...
Page 11: Dimensions And Fixings
162mm Flue Ø 100mm Tap Rail Boiler Boiler Side Side Condensate Pressure Drain Relief Valve (15mm) 40 mm 130 mm 130 mm 65 mm 162.5 mm Heating Heating Flow Inlet Return (22mm) (22mm) (22mm) © Baxi Heating UK Ltd 2013...
Page 12: System Details
MUST be fitted to optimise the economical operation of the boiler in accordance with Part L of the Building Regulations (2010). A range of optional controls are available. Full details are contained in the relevant Sales Literature. © Baxi Heating UK Ltd 2013...
Page 13 5. A boiler discharge pump is available, part no. 720648301. This pump will dispose of both condensate & high Pressure Relief Valve temperature water from the relief valve. It has a maximum Discharge Pipe head of 5 metres. © Baxi Heating UK Ltd 2013...
Page 14: Site Requirements
2. BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation. 5mm Min 300mm (290mm with flap removed) In Operation Fig. 9 © Baxi Heating UK Ltd 2013...
Page 15 In IE reference should be made to the current edition of I.S. Outside Zones 813 “Domestic Gas Installations” and the current ETCI rules. 2.25 m Zone 1 Zone 2 Zone 0 0.6 m Fig. B In GB Only © Baxi Heating UK Ltd 2013...
Page 16 *It is NOT RECOMMENDED to connect upstream of the sink or other waste water receptacle ! © Baxi Heating UK Ltd 2013...
Page 17 45° iv) Termination to a purpose made soakaway Further specific requirements for soakaway Boiler design are referred to in BS 6798. 500mm min Holes in the soak-away must face away from the building © Baxi Heating UK Ltd 2013...
Page 18 Boiler External runs & those in unheated locations still require insulation. Condensate Pump Pipe must terminate above water level but below surrounding surface. Cut end at 45° © Baxi Heating UK Ltd 2013...
Page 19 (see Top View Rear Flue Section 9.0). Fig. 11 Property Boundary Line Air Inlet Opening Window or Door 150mm Fig. 13 MIN. Fig. 12 Likely flue positions requiring a flue terminal guard © Baxi Heating UK Ltd 2013...
Page 20 This bend is equivalent to 1 metre (ii) This bend is equivalent to 1 metre Total equivalent length = A+B+C+2 x 90° Bends © Baxi Heating UK Ltd 2013...
Page 21: Flue
Secure the deflector to the terminal with screws provided. Flue Accessories 1. For full details of Flue Accessories (elbows, extensions, clamps etc.) refer to the Flue Installation Guide supplied in the literature pack. © Baxi Heating UK Ltd 2013...
Page 22 2. Make the flow and return connections to the isolation taps. Fig. 19 Flush the system thoroughly to remove all impurities (see Flushing Tube System Details, Section 6.1). Heating Flow Fig. 20 Heating Return © Baxi Heating UK Ltd 2013...
Page 23: Installation
Condensate Trap Outlet Pipe 3. The boiler condensate trap should be primed by pouring Fig. 23 approximately 300ml of water into the flue spigot. Do not allow any water to fall into the air inlet. © Baxi Heating UK Ltd 2013...
Page 24 9. Using the clearance holes in the Connection Assembly secure it to the Terminal Assembly using the screws Fig. 26 supplied (Fig. 28). ‘TOP’ Label Securing Screw Sealing Tape Fig. 28 Fig. 27 ‘TOP’ Label © Baxi Heating UK Ltd 2013...
Page 25 16. Make good between the wall and air duct outside the building, appropriate to the wall construction and fire rating. 17. If necessary fit a terminal guard (see Section 8.4). Slots at bottom Slots at bottom Fig. 31 Fig. 31 © Baxi Heating UK Ltd 2013...
Page 26: Commissioning
1. Prior to commissioning the boiler preliminary electrical system checks should be carried out. Fuses Terminal Block 2. These should be performed using a suitable meter, and Fig. 33 include checks for Earth Continuity, Resistance to Earth, Short Circuit and Polarity. © Baxi Heating UK Ltd 2013...

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