Baxi Maxflow Combi FS Installation And Servicing Instrucnion
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Baxi Maxflow Combi FS Installation And Servicing Instrucnion

Baxi Maxflow Combi FS Installation And Servicing Instrucnion

Gas fired floor standing combination boiler with unvented hot water storage
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Baxi Maxflow Combi FS
Gas Fired Floor Standing 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 FS

  • Page 1 Please leave these instructions with the user Baxi Maxflow Combi FS Gas Fired Floor Standing 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 FS G.C.N 47 075 10 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 FS is a fully automatic gas fired floor standing 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 Central Heating Flow Pressure Relief Valve Central Heating Return Domestic Hot Water Flow Mains Water Inlet Gas Inlet Domestic Hot Water Storage Cylinder Storage Cylinder Heating Coil Expansion Vessel 10. Domestic Hot Water Storage Drain 11. Heating Coil Drain 12.

  • Page 6: Appliance Operation

    Central Heating Circuit 3.0 Appliance Operation 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

    Water Temperature External Fuse Rating D.H.W. Flow Temp (adjustable) SEDBUK Declaration For Internal Fuse Rating 5° C to 65°C (± 5°C) Maxflow Combi FS External Controls 230V switching Water Storage Volume 54 litres Electrical Protection IPx4D The seasonal efficiency (SEDBUK) (Appliance must be connected to an is 78.6 %...

  • Page 8: Dimensions And Fixings

    5.0 Dimensions and Fixings DIMENSIONS A 630mm B 850mm C 107mm Ø Min. D 600mm E 100mm Ø Min. F 93mm G 120mm Outer Case Rear of Case View From Above 50mm 80mm 60mm 50mm 40mm 40mm Centre line of pressure relief valve is Cold Heating Heating...

  • Page 9: System Details

    6.0 System Details Information 1. The Baxi Maxflow Combi FS 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 Combi Controller, is recommended.
  • Page 11 6.0 System Details System Filling and Pressurising 1. A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. Double Stop Check Stop 2. There are connection points on the mains cold Valve Valve Valve...
  • 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, the Water Supply (Water Fittings) Regulations and the Water Bylaws (Scotland). 2. Your attention is drawn to: Schedule 2, Section 6 of the publication Water Regulations Guide which relates to backflow prevention.

  • Page 13: Site Requirements

    WARNING - The addition of anything that may interfere with the normal operation of the Fig. 11 appliance without the express written permission of Baxi UK Limited could invalidate the appliance warranty and infringe the Gas Safety (Installation and Use) Regulations. 500mm...
  • Page 14 7.0 Site Requirements Location 1. The boiler must be positioned on a flat and level floor or base which must be capable of supporting the full operational weight of the boiler. The flue must pass through an outside wall or roof and discharge to atmosphere in a position permitting satisfactory removal of combustion products and providing an adequate air supply.
  • Page 15 7.0 Site Requirements Flue 1. The flue terminal position must always be in accordance with the current edition of B.S. 5440 Part 1, and either Part J of the Building Regulations England and Wales or Part J of the Building Standards (Scotland) Regulations as appropriate.
  • Page 16 7.0 Site Requirements Flue Dimensions When routed to the rear the flue must be at least 295mm long, plus the thickness of the wall. The maximum length when using the standard flue kit is 1m from adaptor to terminal . The maximum permissible equivalent flue length is: 5 metres.
  • Page 17 Maximum Length Measurements to be taken from Flue Adaptor - view from rear 7.12 Flue Options 1. The Baxi Maxflow Combi FS can be fitted with flue systems as illustrated. 2. The standard flue is suitable only for horizontal applications.

  • Page 18: Installation

    1. Connect a tube to the central heating flow or return pipe. 2. Flush thoroughly (see Section 6.2 of System Details). 3. The Baxi Combi filling loop kit can be used to flush the system. IMPORTANT: Do not use any safety valves to flush or drain the system.
  • Page 19 IMPORTANT : Fitting the Flue 8.0 Installation • The complete flue system must be fitted to the appliance before positioning when the wall against which the boiler is being installed is that through which the flue will terminate. • When routing either to the left or vertically, sufficient length of flue must be fitted to the Rear Flue boiler to ensure that it extends outside the outercase.
  • Page 20 Rubber Seal 8.0 Installation Left Side and Vertical Flue (cont) 3. Slide the clip over one end of the air duct. Flue Adaptor Engage the air duct over the flue duct. Fig. 28 4. Position the rubber seal equally over the joint between the air duct and adaptor.
  • Page 21 From pressure & 8.0 Installation temperature relief valve Unvented Hot Water Storage (Fig. 32) This pipe must form IMPORTANT: When installing a left hand flue the branch system it is not practical to site the components of the unvented kit to the left of the boiler. Pressure NOTE: The installation is subject to Building Reducing Valve...
  • Page 22 Minimum Maximum resistance 8.0 Installation 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 Discharge Pipe size pipe D1 tundish elbows or bends) or bend 22mm up to 9m...
  • Page 23 8.0 Installation Making The Electrical Connections To connect the mains input cable proceed as Link for External follows:- Controls Terminal Block Cable Clamp 1. Pull the upper corners of the outercase front panel forwards. Draw the panel upwards to disengage it from the locating lugs (Fig. 37). 2.

  • Page 24: Commissioning The Boiler

    Commissioning the Boiler Facia Panel Commissioning the Boiler 1. Reference should be made to BS 5449 Section 5 when commissioning the boiler. Facia Cover 2. Open the mains water supply to the boiler. 3. Open all hot water taps to purge the DHW system.
  • Page 25 Commissioning the Boiler Completion 1. Flush the system again and treat it in accordance with BS7593 and the flushing agent and inhibitor manufacturer’s instructions. 2. Set the adjustable pointer on the pressure gauge to 1 bar (Fig. 42). 3. Fill in the required details on the warning label fixed to the rear of the outercase front panel.

  • Page 26: Servicing The Boiler

    Outercase Front Panel 10.0 Servicing the Boiler 10.1 Annual Servicing 1. For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be performed by a competent person. NOTE: The boiler incorporates a sample point in Fig.
  • Page 27 10.0 Servicing the Boiler 10.1 Annual Servicing (Cont.) Heat Exchanger 10. Gently clean the underside of the heat exchanger with a soft brush, taking care not to damage any of the fins. NOTE: To gain access to the top of the heat exchanger for cleaning purposes see Section 11.2 of Changing Components, which includes details of removing the fan.

  • Page 28: Changing Components

    11.0 Changing Components IMPORTANT: When changing components ensure that both the gas and electrical Securing Wires Screws supplies to the boiler are isolated before any work is started. Fig. 49 See Section 10.0 “Annual Servicing” for removal of case panel and combustion box door. 11.1 Pressure Switch (Fig.
  • Page 29 Sensing Electrode Burner 11.0 Changing Components Spark Electrode Fig. 53 11.3 Burner (Fig. 53) 1. Undo the screws securing the combustion box inner panel. Remove the panel and examine the insulation piece. Electrode Leads 2. At the lower right of the combustion box undo Burner Feed the nut connecting the burner feed pipe to the Pipe...
  • Page 30 11.0 Changing Components Top Panel 11.7 Temperature Sensors Sensor There are two sensors, one on the boiler flow pipe and one in the storage cylinder. Flow Pipe Sensor (Fig. 56) 1. To replace the flow pipe sensor ease the retaining tab away and disconnect the electrical plug.
  • Page 31 11.0 Changing Components 11.8 Pressure Gauge (Fig. 59) 1. Isolate the central heating system and drain the primary circuit. Hold the square section on the gauge with a suitable spanner. 2. Undo the nut securing the gauge to the return pipe.
  • Page 32 11.0 Changing Components 11.10 Insulation (Fig. 62) There are four insulation pieces in the combustion box - two side pieces, one rear and one front attached to the combustion box inner panel. Front Piece 1. Undo the screws securing the combustion box inner panel.
  • Page 33 11.0 Changing Components 11.12 Circuit Boards & Electrical Components (Fig. 64) See section 12.0 “Illustrated Wiring Diagram” for the layout of all electrical components. To gain access hinge the facia cover panel down. Remove the facia securing screws and allow the facia to hinge down.
  • Page 34 11.0 Changing Components 11.12 Circuit Boards & Electrical Components (Cont.) (Fig. 65) Selector Switch 1. Note the position of the wires and remove them. 2. Carefully pull off the selector control knob. Undo the securing screws and remove the switch from the facia.
  • Page 35 Top Panel 11.0 Changing Components 11.13 Diverter Valve - Head Only (Figs. 67 & 68) 1. Remove the outercase top panel and undo the screws securing the wiring cover panel. Disconnect the earth lead from the spade terminal on the rear of the panel. 2.
  • Page 36 Top Panel 11.0 Changing Components 11.14 Diverter Valve - Complete (Figs. 69 & 70) 1. Remove the outercase top panel and undo the screws securing the wiring cover panel. Disconnect the earth lead from the spade terminal on the rear of the panel. 2.
  • Page 37 11.0 Changing Components 11.15 Differential Pressure Switch Switch (Figs. 71 & 72) Sensing Head Spring Clip 1. Remove the spring clip securing the switch sensing head to the switch body. Draw the head off the body. Switch 2. Isolate the central heating system and drain the Body boiler primary circuit.
  • Page 38 11.0 Changing Components 11.18 Pump - Head Only (Figs. 77, 78 & 79). 1. Isolate the central heating system and drain the boiler primary circuit. Remove the socket head screws securing the pump head to the body and draw the head away. 2.
  • Page 39 11.0 Changing Components 11.21 Pressure Reducing Valve Cartridge (Figs. 81 & 82) 1. Turn off the mains water supply and draw off any residual from the domestic hot water system. Drain the domestic hot water storage cylinder. 2. Unscrew the cartridge from the the valve body and discard.

  • Page 40: Illustrated Wiring Diagram

    12.0 Illustrated Wiring Diagram Air Pressure Switch Reset Switch Overheat Differential Water Thermostat Flow Switch Gas Valve Relay PCB Main PCB 1 2 3 4 5 Ignition Sequence Pump Flame Sensing Electrode 48 47 46 45 Diverter Valve Primary Sensor Link Selector Control...

  • Page 41: Fault Finding

    13.0 Fault Finding Refer to Section 12.0 “Illustrated Wiring Diagram” CARRY OUT INITIAL FAULT FINDING CHECKS for position of numbered terminals 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 Central Heating - Follow operational sequence minimum gas pressure is 19.5mbar (natural gas), 27mbar (butane) or 36mbar (propane).
  • Page 42 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. Electrical supply at Replace neon PCB Is neon illuminated neon PCB Replace main PCB Pump runs, primary water circulates through DHW...
  • Page 43 13.0 Fault Finding Fault Finding Solutions 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 44 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 Replace Burner output across terminals 16,17...

  • Page 45: Short Parts List

    14.0 Short Parts List Short Parts List Key G.C. Description Manufacturers No. No. Part No. Pressure Switch 248630 378-864 247381 Burner 248636 E03-572 Pressure Differential Switch 247388 379-799 Pump 247738 Automatic Air Vent 248461 E59-897 Gas Valve 247392 Diverter Valve (3 Port Valve) 248653 Pressure Gauge 248670...
  • Page 46 14.0 Short Parts List Short Parts List Key G.C. Description Manufacturers No. No. Part No. E59-875 Electrode Ignition/Sensing 247382 E03-582 Electrode Lead Ignition 247385 Electrode Lead Sensing 248710 E60-098 Microswitch Loom 247453 Limit Thermostat (O/Heat) 248656 Temperature Sensor 248655 379-764 Suppresor 247397 Main PCB...
  • Page 47 Baxi UK Limited manufacture a comprehensive range of products for the domestic heating market. Gas Central Heating Boilers (Wall, Floor and Fireside models). Independent Gas Fires. Renewal Firefronts. Gas Wall Heaters. Solid Fuel Fires. If you require information on any of these products,...

  • Page 48: After Sales Service

    Comp N 248660 - Iss 4 - 5/02 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 921.787.3...

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