Baxi Megao System 15 Installation And Service Manual
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Baxi Megao System 15 Installation And Service Manual

Baxi Megao System 15 Installation And Service Manual

Gas fired wall mounted condensing system boiler
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United Kingdom
en
Installation and Service Manual
Gas Fired Wall Mounted Condensing System Boiler
M M ega*o System
15 - 18 - 24 - 28 - 32
These instructions include the Benchmark Commissioning Checklist and should be left with the
user for safe keeping. They must be read in conjunction with the Flue Installation Guide.

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  • Page 1 United Kingdom Installation and Service Manual Gas Fired Wall Mounted Condensing System Boiler M M ega*o System 15 - 18 - 24 - 28 - 32 These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping. They must be read in conjunction with the Flue Installation Guide.
  • Page 2 Therefore the checklist only applies if the appliance is being installed in a dwelling or some related structure. © Baxi Heating UK Ltd 2015 All rights reserved. No part of this publication may The flowchart opposite gives guidance for installers on the...

  • 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 2015...

  • Page 4: Systems

    Economic Area of the following BS 7593 Treatment of water in domestic hot water central heating systems. Baxi Megaflo 15 - 18 - 24 - 28 - 32 System ErP In IE the following Codes of Practice apply: Standard Scope declare that the above is in conformity with the provisions of the Council Directive I.S.
  • 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 2015...

  • Page 6: Table Of Contents

    System Details Site Requirements Flue Options Installation 10.0 Commissioning 11.0 Completion 12.0 Servicing 13.0 Changing Component 14.0 Setting the Gas Valve 15.0 Electrical 16.0 Short Parts List 17.0 Fault Finding 18.0 Notes Benchmark Checklist © Baxi Heating UK Ltd 2015...

  • Page 7: Introduction

    1.0 Introduction Description 1. The Baxi Megaflo System is a fully automatic gas fired wall mounted condensing system boiler. It is room sealed and fan assisted. Case Front Panel 2. The boiler is set to give a maximum output of :- 15 models - 15 kW 16.2 kW Pnc (Condensing)

  • Page 8: General Layout

    Flame Sensing Electrode Spark Electrode Primary Heat Exchanger Fan Assembly On/Off/Reset Selector Switch Central Heating Temperature Control Calibration Control Venturi Air/Gas Collector Combustion Box Cover & Burner Igniter Burner On Light Central Heating Mode Light Display © Baxi Heating UK Ltd 2015...

  • Page 9: Appliance Operation

    Gas Valve Pump Automatic Air Vent Pressure Relief Valve Boiler Drain Point Gas Inlet Boiler Flow Boiler Return Pressure Gauge Automatic By-Pass Water Pressure Sensor Safety Thermostat Temperature Sensor Expansion Vessel Return Temperature Sensor © Baxi Heating UK Ltd 2015...

  • Page 10: Technical Data

    This value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating of dwellings. The test data from which it has been calculated has been certified by 0085. 1000 1200 © Baxi Heating UK Ltd 2015 Flow Rate (l/h)
  • Page 11 (1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C return temperature (at heater inlet). High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet. The back cover for contact details. © Baxi Heating UK Ltd 2015...

  • Page 12: Dimensions And Fixings

    F 145mm G 106mm 360° Orientation H 180mm Flue Ø 100mm Tap Rail 32.5 mm Condensate Drain 130 mm 130 mm 65 mm Heating Pressure Relief Heating Return Flow Inlet Valve (22mm) (22mm) (22mm) (15mm) © Baxi Heating UK Ltd 2015...

  • Page 13: System Details

    (Test kits are available from inhibitor stockists.) • For information or advice regarding any of the above contact Baxi Customer Support 0344 871 1525. Bypass 1. The boiler is fitted with an automatic integral bypass.
  • Page 14 Pressure Relief Valve 4. A remote relief valve kit is available to enable the boiler to Discharge Pipe be installed in cellars or similar locations below outside ground level (kit no. 5121379). © Baxi Heating UK Ltd 2015...

  • Page 15: Site Requirements

    Additional clearances may be required for the passage of pipes around local obstructions such as joists running parallel to the front face of the boiler. 450mm Min For Servicing Purposes 5mm Min In Operation Fig. 6 © Baxi Heating UK Ltd 2015...
  • Page 16 In GB this is the current I.E.E. Wiring Regulations and Building Regulations. Fig. B In IE reference should be made to the current edition of I.S. In GB Only 813 “Domestic Gas Installations” and the current ETCI rules. © Baxi Heating UK Ltd 2015...
  • Page 17 If soil pipes or waste pipes are subjected to internal pressure fluctuations when WC's are flushed or sinks emptied then back-pressure may force water out of the boiler trap and cause appliance lockout. © Baxi Heating UK Ltd 2015...
  • 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 2015...
  • Page 19 Top View Rear Flue Fig. 8 Property Boundary Line Air Inlet Opening Window or Door 150mm Fig. 10 MIN. Likely flue positions requiring Fig. 9 a flue terminal guard © Baxi Heating UK Ltd 2015...

  • Page 20: Flue Options

    Guide supplied with the boiler. from the terminal to allow condensate to run back to the boiler. This bend is equivalent to 1 metre This bend is equivalent to 1 metre Total equivalent length = A+B+C+2 x 90°Bends © Baxi Heating UK Ltd 2015...
  • Page 21 Please leave these instructions with the Installation & Servicing Instructions. © Baxi Heating UK Ltd 2011 Fig. 12a © Baxi Heating UK Ltd 2015...

  • Page 22: Installation

    Flushing Tube Flushing Wall Plate 1. Connect a tube to the central heating flow or return pipe (Fig. 16). 2. Flush thoroughly (see System Details, Section 6.2). Fig. 16 Central Heating Return © Baxi Heating UK Ltd 2015...
  • Page 23 2. The connection will accept 21.5mm ( in) 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. 18 Discharge Pipe © Baxi Heating UK Ltd 2015...
  • Page 24 9. Using the clearance holes in the Connection Assembly secure it to the Terminal Assembly using the screws supplied (Fig. 23). Fig. 21 ‘TOP’ Label Securing Screw Sealing Tape Fig. 22 Fig. 23 ‘TOP’ Label © Baxi Heating UK Ltd 2015...
  • Page 25 17. Make good between the wall and air duct outside the Elbow to adaptor securing screws building, appropriate to the wall construction and fire rating. 18. If necessary fit a terminal guard (see Section 8.4). Slots at bottom Fig. 26 © Baxi Heating UK Ltd 2015...
  • Page 26 1. Prior to commissioning the boiler preliminary electrical system checks should be carried out. Fig. 29 Terminal Block 2. These should be performed using a suitable meter, and include checks for Earth Continuity, Resistance to Earth, Short Circuit and Polarity. © Baxi Heating UK Ltd 2015...

  • Page 27: Commissioning

    ‘ 0’ the boiler runs at minimum rate. 18. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob. © Baxi Heating UK Ltd 2015...
  • Page 28 Ensure test points are capped, the calling 0344 871 1525. boiler case front panel is correctly fitted & secured and all other commissioning procedures completed. Complete the ‘Benchmark’ Checklist, recording the CO & combustion ratio readings as required. © Baxi Heating UK Ltd 2015...
  • Page 29 12. For IE, it is necessary to complete a “Declaration of Conformity” to indicate compliance with I.S. 813. An example of this is given in I.S. 813 “Domestic Gas Installations”. This is in addition to the Benchmark Commissioning Checklist. Fig. 39 Fig. 38 © Baxi Heating UK Ltd 2015...

  • Page 30: Completion

    I.S. 813 “Domestic Gas Installations”. This is in addition to the Benchmark Commissioning Checklist. 5. Hand over the Users Operating, Installation and Servicing Instructions giving advice on the necessity of regular servicing. Facia Panel Fig. 40 © Baxi Heating UK Ltd 2015...

  • Page 31: Servicing

    (Fig. 42). 5. Unscrew the sump from the bottom of the condensate trap Sump assembly (Fig. 43) and remove any deposits from the sump and trap. Clean as necessary and replace the sump Fig. 43 © Baxi Heating UK Ltd 2015...
  • Page 32 13. Complete the relevant Service Interval Record section of Fig. 44 the Benchmark Commissioning Checklist at the rear of this publication and then hand it back to the user. Venturi Injector Gas Inlet Pipe Fig. 45 © Baxi Heating UK Ltd 2015...

  • Page 33: Changing Component

    3. Check the condition of the sealing gaskets and replace if necessary. Reassemble in reverse order. Spark Electrode Electrode Leads Sensing Electrode Fig. 47 © Baxi Heating UK Ltd 2015...
  • Page 34 1. Remove the collector and fan assembly as described in Injector section 13.3. Collector Fig. 48 2. Extract and replace the injector and reassemble in reverse order. Fig. 50 When fitting the venturi ensure that the arrow is pointing forward © Baxi Heating UK Ltd 2015...
  • Page 35 Keep the insulation vertical and Heat press firmly into position. Exchanger 7. Examine the cover seal and replace if necessary. Rear Insulation Spark Electrode Venturi Cover Insulation Seal Fig. 52 Collector Electrode Sensing Leads Electrode © Baxi Heating UK Ltd 2015...
  • Page 36 2. Prise the sensor retaining clip off the pipe and remove the sensor from the clip. 3. Reassemble in reverse order. Return Heating Temperature Sensor Pressure Sensor Fig. 55 Fig. 56 © Baxi Heating UK Ltd 2015...
  • Page 37 2. Examine the ‘O’ ring seal, replacing if necessary, and fit it to the new automatic air vent. Pump Head 3. Reassemble in reverse order. Fig. 57 Automatic Air Vent Fig. 58 © Baxi Heating UK Ltd 2015...
  • Page 38 4. Remove the screws securing the switch to the facia panel. Selector Switch Knob 5. Fit the new switch, ensuring that it is correctly positioned and Fig. 63 Temperature Control Knobs reassemble in reverse order. © Baxi Heating UK Ltd 2015...
  • Page 39 3. Remove the bracket and vessel from the boiler. Expansion Vessel 4. Locate the retaining bracket on the upper flange of the vessel and fit to the boiler. 5. Reassemble in reverse order. Boiler Chassis Lock Nut Fig. 66 © Baxi Heating UK Ltd 2015...

  • Page 40: Setting The Gas Valve

    Allow the analyser reading maximum rate it must be to settle before any further 12. Check the Combustion Performance (CO/CO ratio). rechecked at minimum rate and adjustment This must be less than 0.004. adjusted if required. © Baxi Heating UK Ltd 2015...

  • Page 41: Electrical

    9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 Electrode Control PCB X501 Pump 6 Way Connector Pump Spark Generator g or w Gas Valve Link Ignition Electrode Mains Input Cable © Baxi Heating UK Ltd 2015...

  • Page 42: Short Parts List

    Water Pressure Switch 5114748 Overheat Thermostat 5114729 NTC Sensor 5114725 Gas Valve 720514301 NTC Sensor (Return) 5114725 5122457 PCB 18 5122458 PCB 24 720045201 PCB 28 720795401 PCB 32 5122459 Pressure Gauge 5118385 Pump PCB 7222704 © Baxi Heating UK Ltd 2015...

  • Page 43: Fault Finding

    5 seconds when E110, E130 & E133 are displayed it is possible to relight the boiler. 4. If this does not have any effect, or the codes are displayed regularly further investigation is required. © Baxi Heating UK Ltd 2015...
  • Page 44 Burner output modulates to Error 130 flashing maintain the temperature set Go to section ‘M’ Pump continues to run for 3 Operation sequence Burner goes out Fan stops after 10 seconds minutes successful (room thermostat open) © Baxi Heating UK Ltd 2015...

  • Page 45: Fault Finding Solutions Sections

    Open the automatic air vent vent is opened Fan connections correct at fan. PCB - X2 connector, is 230V AC across Fan jammed or faulty winding Replace fan terminals 5 & 7 Replace PCB © Baxi Heating UK Ltd 2015...
  • Page 46 1. Ignition electrode and lead (Note: from multimeter connect 2. Electrode connection ‘common’ to 2 & ‘volt’ to 5) Replace igniter 3. Spark gap and position Check wiring Burner Viewing Window Sensing Electrode Spark Ignition Electrode Electrode Position © Baxi Heating UK Ltd 2015...
  • Page 47 Cold resistance approximately Replace sensor 10kì @ 25° C (CH sensor) 20kì @ 25° C (Flue sensor) (resistance reduces with increase in temp.) Replace heat exchanger If pump is running the heat exchanger could be obstructed © Baxi Heating UK Ltd 2015...

  • Page 48: Notes

    18.0 Notes © Baxi Heating UK Ltd 2015...
  • Page 49 18.0 Notes © Baxi Heating UK Ltd 2015...

  • Page 50: Benchmark Checklist

    GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty.

  • Page 51: Service Record

    SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions. SERVICE 01 SERVICE 02 Date:...

  • Page 52: Description

    For the warranty to be maintained, please make sure... Benchmark checklist is completed Warranty is registered with Baxi The boiler has an annual service For full terms and conditions, visit www.baxi.co.uk/terms. Failure to adhere to terms and conditions will void your manufacturer’s warranty. Baxi Brooks House,...

This manual is also suitable for:

Megao system 18Megao system 28Megao system 32Megao system 24

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