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Baxi Maxflow Combi WM Installation And Servicing Instructions

Gas fired wall mounted combination boiler with unvented hot water storage
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Baxi Maxflow Combi WM
Gas Fired Wall Mounted Combination Boiler
with Unvented Hot Water Storage
IMPORTANT: This boiler MUST be installed with
the Unvented Kit Part No. 247369 which is in
a separate box supplied with the boiler
Installation and
Servicing Instructions
Please leave these instructions with the user

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Summary of Contents for Baxi Maxflow Combi WM

  • Page 1 Please leave these instructions with the user Baxi Maxflow Combi WM Gas Fired Wall Mounted Combination Boiler with Unvented Hot Water Storage IMPORTANT: This boiler MUST be installed with the Unvented Kit Part No. 247369 which is in a separate box supplied with the boiler...
  • Page 2 Baxi Maxflow Combi WM G.C.N 47 075 03 Baxi UK Limited is one of the leading manufacturers of domestic heating products in the UK. Our first priority is to give a high quality service to our customers. Quality is designed into every Baxi product - products which fulfil the demands and needs of customers, offering choice, efficiency and reliability.

  • Page 3: Table Of Contents

    Contents Section Page Introduction General Layout Appliance Operation Technical Data Dimensions and Fixings System Details Site Requirements Installation Commissioning the Boiler 10.0 Servicing the Boiler 11.0 Changing Components 12.0 Illustrated Wiring Diagram 13.0 Fault Finding 14.0 Short Parts List...

  • Page 4: Introduction

    Description 1. The Baxi Maxflow Combi WM is a fully automatic gas fired wall mounted combination boiler incorporating a 54 litre unvented hot water storage cylinder. It is room sealed and fan assisted.

  • Page 5: General Layout

    2.0 General Layout Layout Fan Assembly Sensing Electrode Pressure Relief Valve Automatic Air Vent Circulation Pump Gas Valve Assembly Facia and Control Panel Optional Integral Timer Position Pressure Gauge 10. Electrical Box 11. Motorised Valve 12. Burner 13. Spark Electrode 14.

  • Page 6: Appliance Operation

    3.0 Appliance Operation Central Heating Circuit Boiler Operation 1. The boiler operating mode is controlled by the selector switch on the control panel. When set to it will operate in the Domestic Hot Water and Central Heating modes. For Domestic Hot Water only the selector switch should be set to 2.

  • Page 7: Technical Data

    IP44 (IPx4D) (Appliance must be connected to an earthed supply) LPG Gases / Propane and Butane SEDBUK Declaration For Flue Terminal Diameter 100mm Maxflow Combi WM Burner Injector 18 x 0.69mm diameter Dimensions Projection 93mm Burner Pressure Max Rate Min Rate...

  • Page 8: Dimensions And Fixings

    5.0 Dimensions and Fixings DIMENSIONS A 950mm B 450mm C 600mm D 107mm Ø Min. E 180mm F 160mm G 120mm H 160mm 360° Orientation in Steps of 45° Tube Ø 100mm Outer Case 118mm 100mm 110mm 100mm 55mm 55mm 62mm Hot Water Cold Mains...

  • Page 9: System Details

    6.0 System Details Information 1. The Baxi Maxflow Combi WM Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN). a) IRN 001 -...
  • Page 10 2. Suitable timer kits are available as optional extras. 3. For optimum operating conditions and maximum economy the fitting of a programmable thermostat, such as the Baxi Maxflow Combi WM Controller, is recommended.

  • Page 11: Pressure Relief Valve

    6.0 System Details System Filling and Pressurising 1. A filling point connection on the central heating return pipework must be provided to facilitate Double initial filling and pressurising and also any Check subsequent water loss replacement/refilling. Valve 2. The filling method adopted must be in Stop Valve accordance with all relevant water supply bye- laws and use approved equipment.
  • Page 12 6.0 System Details Domestic Hot Water Circuit 1. All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply bye-laws. 2. Your attention is drawn to: IRN 116 and the Water Supply (Water Fittings) Regulations 1999 Schedule 2, Section 8, paragraph 17.

  • Page 13: Site Requirements

    WARNING - The addition of anything that may interfere with the normal operation of the appliance without the express written permission of Baxi UK Limited could invalidate the appliance warranty and infringe the Gas Safety (Installation and Use) Regulations. 450mm Clearances (Fig.
  • Page 14 7.0 Site Requirements Location 1. The boiler may be fitted to any suitable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permitting satisfactory removal of combustion products and providing an adequate air supply. The wall must be capable of supporting the weight of the appliance.
  • Page 15 7.0 Site Requirements Flue 1. The following guidelines indicate the general requirements for siting balanced flue terminals. Recommendations for flues are given in BS 5440 Pt.1. 2. If the terminal discharges onto a pathway or passageway, check that combustion products will not cause a nuisance and that the terminal will not obstruct the passageway.
  • Page 16 7.0 Site Requirements Flue Dimensions The standard horizontal flue kit allows for flue lengths between 100mm and 1m from elbow to terminal (Fig. 17). The maximum permissible equivalent flue length is: 4 metres. NOTE: Each additional 45° of flue bend will Fig.
  • Page 17 7.0 Site Requirements 7.12 Flue Options 1. The Baxi Maxflow Combi WM can be fitted with flue systems as illustrated. 2. The standard flue is suitable only for horizontal applications. 3. Maximum permissible equivalent flue lengths are:- Maximum Length = 3m inc. 2 x 45° bends Horizontal 4.0 metres...

  • Page 18: Installation

    160mm appliance packaging. 2. After considering the site requirements (see Section 7.0) position the template on the wall Maxflow Combi WM ensuring it is level both horizontally and vertically. For Side Flue Exit FIXING TEMPLATE 3. Select the six most suitable fixing holes and mark their position.
  • Page 19 8.0 Installation Fitting the Pressure Relief Discharge Pipe (Fig. 24) 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.
  • Page 20 8.0 Installation Minimum Maximum resistance Minimum size of allowed, expressed Resistance Valve size of discharge as a length of created by outlet discharge pipe D2 from straight pipe (i.e. no each elbow Unvented Hot Water Store Discharge size pipe D1 tundish elbows or bends) or bend...
  • Page 21 8.0 Installation Wall Thickness Fitting The Flue HORIZONTAL FLUE 1. The standard flue is suitable for lengths 100mm minimum to 1m maximum (measured from the edge of the flue elbow outlet). Rear Flue: maximum wall thickness - 900mm Right Side Flue: maximum wall thickness - 875mm Left Side Flue: maximum wall thickness - 615mm 2.
  • Page 22 (see Section 7.10 & 7.11). VERTICAL FLUE Fig. 30 1. Only a flue approved with the Baxi Maxflow Combi WM can be used. 2. For information on vertical flues consult the Clip Baxi Maxflow Combi WM Installer Guide or Notes for Guidance supplied with the vertical flue pack.

  • Page 23: Commissioning The Boiler

    8.0 Installation Making The Electrical Connections To connect the mains input cable proceed as follows:- Terminal Block Cover Mains Cable 1. Hinge the facia panel downwards and undo the two screws retaining the control box to the boiler chassis. Allow the control box to hinge down (Fig.

  • Page 24: Commissioning The Boiler

    Commissioning the Boiler Commissioning the Boiler 1. Reference should be made to BS 5449 Section 5 when commissioning the boiler. 2. Open the mains water supply to the boiler. 3. Open all hot water taps to purge the DHW system. 4.
  • Page 25 Commissioning the Boiler Completion 1. Carefully read and complete all sections of the “Benchmark” Installation, Commissioning and Service Record Log Book that are relevant to the appliance and installation. The details of the Log Book will be required in the event of any warranty work.

  • Page 26: Servicing The Boiler

    10.0 Servicing the Boiler 10.1 Annual Servicing Outercase Front Panel 1. For reasons of safety and economy, it is Fig. 44 recommended that the boiler is serviced annually. Sampling Screw Servicing must be performed by a competent person. Fig. 43 2.
  • Page 27 10.0 Servicing the Boiler Sensing Electrode 10.1 Annual Servicing (Continued) Securing Screw 15. Gently clean the heat exchanger with a soft Spark Electrode brush, taking care not to damage any of the fins. 16. Inspect the side insulation pieces and replace if they are damaged or deteriorated in any way Burner and brush out any debris or deposits from the...

  • Page 28: Changing Components

    11.0 Changing Components Pressure Switch IMPORTANT: When changing components ensure that both the gas and electrical supplies to the boiler are isolated before any work is started. See Section 10.0 “Annual Servicing” for removal of case panel, doors etc. 11.1 Pressure Switch (Fig.
  • Page 29 11.0 Changing Components 11.4 Gas Valve (Fig. 54) 1. Undo the two screws securing the outercase bottom panel and remove the panel (Fig. 53). 2. Disconnect the wires from the valve modulator and the pressure sensing tube and earth wire from the valve body.
  • Page 30 11.0 Changing Components 11.5 Pressure Gauge (Figs. 55, 56 & 57) 1. Hinge the facia panel downwards and undo the two screws retaining the control box. Lower the control box. 2. Drain the primary circuit. 3. Undo the nut on the pressure gauge capillary from the manifold and remove the screws securing the gauge retaining bracket.
  • Page 31 11.0 Changing Components 11.7 Insulation (Figs. 60 & 61) There are four insulation pieces in the combustion box - two side pieces, one rear and one front attached to the combustion box inner panel. Side Pieces 1. Remove the screws securing the fan hood. Carefully draw the side insulation pieces out, easing the heat exchanger sideways while extracting each piece.
  • Page 32 11.0 Changing Components 11.10 Circuit Boards & Electrical Components (Figs. 65 & 66) See section 12.0 “Illustrated Wiring Diagram” for the layout of all electrical components. To gain access hinge the facia panel down and remove the screws securing the control box. Lower the control box.
  • Page 33 11.0 Changing Components 11.11 Electrodes (Fig. 68) 1. Remove the burner as described in section 11.3 and undo the screw securing the relevant electrode to the burner assembly and remove. 2. Check the electrode positions and reassemble in reverse order. Fig.
  • Page 34 11.0 Changing Components 11.15 Diverter Valve - Head Only (Fig. 73) 1. Disconnect the three pin plug on the valve electrical input cable from the boiler wiring loom. 2. Slacken the screw securing the valve operating head cover. Pull the cover forwards to remove.
  • Page 35 11.0 Changing Components 11.18 Expansion Vessel (Fig. 77) Expansion 1. Drain the primary circuit and undo the nut on Vessel the expansion pipe at the adaptor on the bottom of the vessel. 2. Undo the nut and washer securing the vessel to the mounting bracket on the side of the storage tank.
  • Page 36 11.0 Changing Components 11.20 Pump - Head Only (Figs. 82 & 83). 1. Drain the primary circuit and remove the socket head screws securing the pump head to the body and draw the head away. 2. Undo the screw on the pump wiring cover and remove the cover.

  • Page 37: Illustrated Wiring Diagram

    12.0 Illustrated Wiring Diagram - brown - black - blue - red - yellow Blue - green Brown g/y - green / yellow - white Mains Diverter Valve Blue Mains Link Brown Optional Timers Green/Yellow Mains Input Pump Suppressor Flame Sensing Differential Water Electrode...

  • Page 38: Fault Finding

    13.0 Fault Finding Carry out initial fault finding checks 1. Check that gas, water and electrical supplies are available at the boiler. Electrical supply = 230V ~ 50 Hz. CH water system pressurised to 0.5 bar when the boiler is cold. The preferred minimum gas pressure is 19.5mbar (natural gas), 27mbar (butane) or 36mbar (propane).
  • Page 39 13.0 Fault Finding Domestic Hot Water - Follow operational sequence (DHW storage at ambient temperature i.e. cold) Turn selector to Go to section ‘A’ neon illuminated Turn thermostat to max. Primary water is diverted from CH system to DHW Replace neon PCB or heat exchanger, replace main PCB neon illuminated...
  • Page 40 Fault Finding Solutions 13.0 Fault Finding Is there 230V at: Main terminals L and N Check electrical supply Main terminal fuse Replace fuse neon Replace neon PCB illuminated Both sides of suppressor Replace suppressor PCB M6 connector, terminals 18,19 Check wiring If problem is not solved replace main PCB...
  • Page 41 13.0 Fault Finding Check and correct if necessary Modulating coil faulty Replace Verify electrical continuity between terminal cold resistance gas valve M4 connectors 14,15 (main PCB) and approx. 20 ohm terminal M3 (ignition PCB) connectors 13,14 Check voltage at main PCB - M5 connector across terminals 16,17 Replace Burner output...

  • Page 42: Short Parts List

    14.0 Short Parts List Short Parts List Key G.C. Description Manufacturers No. No. Part No. 393-947 Pressure Switch 247380 378-864 247381 343-786 Burner 247387 E03-572 Pressure Differential Switch 247388 379-799 Pump 247738 E59-878 Automatic Air Vent 247391 E59-897 Gas Valve 247392 E59-890 Diverter Valve (3 Port Valve) 247395...
  • Page 43 14.0 Short Parts List Short Parts List Key G.C. Description Manufacturers No. No. Part No. E59-874 Electrode Ignition Front 247384 E03-582 Electrode Lead Ignition 247385 343-828 Electrode Lead Sensing 247765 E60-098 Microswitch Loom 247453 E59-895 Limit Thermostat (O/Heat) 247393 343-571 Temperature Sensor 247394 379-764...

  • Page 44: After Sales Service

    Comp N 247308 - Iss 7 - 10/01 After Sales Service 08706 096 096 Technical Enquiries 08706 049 049 Baxi UK Limited Brownedge Road Bamber Bridge Preston Lancashire PR5 6SN www.baxi.com 921.970.1...

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