Baxi Duo-tec Combi HE a Range Installation And Servicing Instructions
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Baxi Duo-tec Combi HE a Range Installation And Servicing Instructions

Gas fired wall mounted condensing combination boiler
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Installation & Servicing Instructions
Duo-tec Combi HE
Range
A
Gas Fired Wall Mounted Condensing
Combination Boiler
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2012

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Summary of Contents for Baxi Duo-tec Combi HE a Range

  • Page 1 Installation & Servicing Instructions Duo-tec Combi HE Range Gas Fired Wall Mounted Condensing Combination Boiler These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping. © Baxi Heating UK Ltd 2012...

  • Page 2: Natural Gas

    UK and to encourage the regular servicing of all © Baxi Heating UK Ltd 2012 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, or stored in any central heating systems to ensure safety and efficiency.

  • 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 2012...
  • Page 4 BS EN 14336 Installation & commissioning of water based heating systems. BS 7074 Expansion vessels and ancillary equipment for sealed water systems. BS 7593 Treatment of water in domestic hot water central heating systems. © Baxi Heating UK Ltd 2012...
  • 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 2012...

  • Page 6: Table Of Contents

    System Details Site Requirements Flue Options Plume Displacement 10.0 Installation 11.0 Commissioning 12.0 Completion 13.0 Servicing 14.0 Changing Components 15.0 Setting the Gas Valve 16.0 Electrical 17.0 Short Parts List 18.0 Fault Finding Benchmark Checklist © Baxi Heating UK Ltd 2012...

  • Page 7: Introduction

    1.0 Introduction Description 1. The Baxi Duo-tec Combi HE is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and mains fed Case Front Panel domestic hot water.

  • Page 8: General Layout

    Central Heating Temperature Control Hot Water Temperature Control Venturi Air/Gas Collector Combustion Box Cover & Burner Igniter Burner On Light Central Heating Mode Light Domestic Hot Water Mode Light Display Position of Optional Integral Timer © Baxi Heating UK Ltd 2012...

  • Page 9: Appliance Operation

    1. With the selector switch (see Section 2.1) in either the central heating or central heating and domestic hot water position, the pump will automatically operate for 1 minute in every 24 hours to prevent sticking. Fig. 3 © Baxi Heating UK Ltd 2012...

  • 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 © Baxi Heating UK Ltd 2012 Flow Rate (l/h)

  • Page 11: Dimensions And Fixings

    32.5 mm Condensate Drain 65 mm 65 mm 65 mm 65 mm 65 mm Heating Heating Domestic Hot Cold Water Pressure Relief Return Valve Flow Water Outlet Inlet Inlet (22mm) (22mm) (15mm) (22mm) (15mm) (15mm) © Baxi Heating UK Ltd 2012...

  • Page 12: System Details

    6.0 System Details Information 1. The Baxi Duo-tec Combi HE Condensing 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 - See text of entry for installation requirements and notes.
  • Page 13 4. A remote relief valve kit is available to enable the boiler to be installed in cellars or similar locations below outside Fig. 6 ground level (kit no. 5121379). Pressure Relief Valve Discharge Pipe © Baxi Heating UK Ltd 2012...
  • Page 14 1. If the area of the installation is recognised as a HARD WATER AREA then a suitable device should be fitted to treat the mains water supply to the boiler. Contact your Water Distribution Company for advice on suitable devices. © Baxi Heating UK Ltd 2012...

  • 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. 9 © Baxi Heating UK Ltd 2012...
  • Page 16 In GB this is the current I.E.E. Wiring Regulations and Zone 0 Building Regulations. In IE reference should be made to the current edition of I.S. 0.6 m 813 “Domestic Gas Installations” and the current ETCI rules. Fig. B In GB Only © Baxi Heating UK Ltd 2012...
  • Page 17 *It is NOT RECOMMENDED to connect upstream of the sink or other waste water receptacle ! © Baxi Heating UK Ltd 2012...
  • Page 18 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 2012...
  • Page 19 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 2012...
  • Page 20 (see Top View Rear Flue Section 9.0). Fig. 11 Property Boundary Line Air Inlet Opening Window or Door 150mm Fig. 12a MIN. Likely flue positions requiring Fig. 12 a flue terminal guard © Baxi Heating UK Ltd 2012...

  • Page 21: Flue Options

    NOTE: Horizontal flue pipes should always be installed with a fall of at least 1.5° 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 2012...
  • Page 22 This bend is equivalent to Equivalent Length Air Duct = 6.5m 1 metre FLUE DUCT Equivalent Sub total Length Value fittings/pipes 1m extension 5.0m 135°bend 0.5m 0.25m 91.5°bend 1.0m 0.5m Equivalent Length Flue Duct = 6.5m © Baxi Heating UK Ltd 2012...
  • Page 23 91.5° 5118588 FLUE GROUP A, N, G Vertical Flue Kits Vertical Flue Terminal 5111078 (use with 5111070) Vertical Flue Terminal 5118576 Pitch Roof Flashing 25°/50° 5122151 Roof Cover Plate 246143 Flat Roof Flashing 246144 © Baxi Heating UK Ltd 2012...
  • Page 24 (at least once every metre using the available pipe supports). Boiler Adaptor 3. Ensure that all joints and elbows are fully engaged and cannot become disconnected during operation. © Baxi Heating UK Ltd 2012...
  • Page 25 8.10 Flue Deflector Fig. 14 1. If required, push the flue deflector over the terminal end and rotate to the optimum angle for deflecting plume. Secure the deflector to the terminal with screws provided. © Baxi Heating UK Ltd 2012...

  • Page 26: Plume Displacement

    Installation & Servicing Instructions and BS5440 Pt. 1. It is NOT necessary to fit a terminal guard over the air inlet or the plume outlet. © Baxi Heating UK Ltd 2012...
  • Page 27 After consulting the table in Example 3 it can be determined Additional Accessories that the concentric flue could be up to approximately 2.3 93° Elbow 5121369 metres long. 45° Elbow (Pair) 5121370 Fig. 18 1 metre 60Ø Extension 5121368 © Baxi Heating UK Ltd 2012...
  • Page 28 14. Fit the 93° elbow/plume outlet and secure with the two remaining screws supplied. Ensure the plume outlet is at least 45° to the wall and that the ‘peak’ is uppermost (Fig. 24). Fig. 24 © Baxi Heating UK Ltd 2012...
  • Page 29 25. All other minimum & maximum dimensions must be adhered to, and the air inlet positioned such that it will not be subject to rain entry. Fig. 28 70° Concentric Flue Length (shown end-on) Outlet Spigot Fig. 29 © Baxi Heating UK Ltd 2012...

  • Page 30: Installation

    10. Fit the filling loop as described in the instructions supplied with it. Fig. 34 Central Heating Return 10.2 Flushing 1. Connect a tube to the central heating flow or return pipe (Fig. 34). 2. Flush thoroughly (see System Details, Section 6.2). © Baxi Heating UK Ltd 2007...
  • Page 31 Condensing Boilers”. 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. © Baxi Heating UK Ltd 2012...
  • Page 32 250mm and 315mm it will be necessary to shorten the Terminal Assembly by careful cutting to accommodate walls of these thicknesses. 7. To dimension ‘X’ add 50mm. This dimension to be known as ‘Y’. Fig. 39 Wall Thickness Fig. 38 © Baxi Heating UK Ltd 2012...
  • Page 33 Extension Tape Cut End Adaptor Fig. 45 Apply Lubricant for ease of assembly. Ensure Extension is fully engaged into Boiler Adaptor Fig. 46 © Baxi Heating UK Ltd 2012...
  • Page 34 NOTE: The 230V switched signal for external controls (Frost Stat - Room Stat - Timer) must always be taken from terminal 2 at the boiler. Live, Neutral and Earth to power these controls must be taken from the Fused Spur. © Baxi Heating UK Ltd 2012...

  • Page 35: Commissioning

    • The integrity of the flue system and the flue seals. • The integrity of the boiler combustion circuit and the relevant seals. Proceed to put the boiler into operation as follows: © Baxi Heating UK Ltd 2012...
  • Page 36 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. 60 Fig. 59 © Baxi Heating UK Ltd 2012...

  • Page 37: 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. 61 © Baxi Heating UK Ltd 2012...

  • Page 38: Servicing

    (Fig. 63). 5. Unscrew the sump from the bottom of the condensate trap Sump assembly (Fig. 64) and remove any deposits from the sump and trap. Clean as necessary and replace the sump. Fig. 64 © Baxi Heating UK Ltd 2012...
  • Page 39 Blanking Cold Water the Benchmark Commissioning Checklist at the rear of this Inlet Tap publication and then hand it back to the user. Restrictor (not on 40 models) Hydraulic Inlet Assembly Fig. 68 Filter © Baxi Heating UK Ltd 2012...

  • Page 40: Changing Components

    3. Check the condition of the sealing gaskets and replace if necessary. Reassemble in reverse order. Spark Electrode Electrode Leads Sensing Electrode Fig. 70 © Baxi Heating UK Ltd 2012...
  • Page 41 1. Remove the collector and fan assembly as described in Injector section 14.3. Collector Fig. 71 2. Extract and replace the injector and reassemble in reverse order. Fig. 73 When fitting the venturi ensure that the arrow is pointing forward © Baxi Heating UK Ltd 2012...
  • Page 42 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. 75 Collector Electrode Sensing Leads Electrode © Baxi Heating UK Ltd 2012...
  • Page 43 3. Unscrew the sensor from the plate heat exchanger manifold. Examine the sealing washer,replacing if necessary. 4. Reassemble in reverse order. The plug will only fit one way. Pressure Sensor Plate Heat Exchanger Fig. 78 DHW Temperature Sensor © Baxi Heating UK Ltd 2012...
  • Page 44 Pump Setting Fig. 80 2. Examine the ‘O’ ring seal, replacing if necessary, and fit it Automatic Air to the new automatic air vent. Vent 3. Reassemble in reverse order. Pump Wiring Cover Fig. 81 © Baxi Heating UK Ltd 2012...
  • Page 45 4. Fit the new valve and ‘O’ ring seal and set to the previously noted orientation. Reassemble in reverse order. Fig. 84 ‘O’ ring seal Grub Screw Safety Pressure Relief Valve Fig. 85 Discharge Pipe © Baxi Heating UK Ltd 2012...
  • Page 46 Assembly 6. Remove the valve assembly. Examine any seals or washers, replacing if necessary. Transfer the DHW NTC to the new valve and reassemble in reverse order. Fig. 87 Pressure Sensor © Baxi Heating UK Ltd 2012...
  • Page 47 4. Remove the screws securing the switch to the facia panel. Facia 5. Fit the new switch, ensuring that it is correctly positioned and reassemble in reverse order. Selector Switch Knob Temperature Control Knobs Fig. 90 © Baxi Heating UK Ltd 2012...
  • Page 48 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. 92 © Baxi Heating UK Ltd 2012...

  • Page 49: 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 2012...

  • Page 50: Electrical

    Control PCB X501 Flame Pump Sensing Electrode Spark Generator Diverter Valve Gas Valve Link Ignition Electrode Mains Input Cable - green - brown - green / yellow - black - red - blue - white © Baxi Heating UK Ltd 2012...

  • Page 51: Short Parts List

    Water Pressure Switch 5114748 Plate Heat Exchanger 5114708 Pump 248042 Flue Thermostat 5114747 NTC Sensor 5114725 Overheat Thermostat 5114729 Pressure Gauge 248090 PCB 24 5121862 PCB 28 720043401 PCB 33 720795201 PCB 40 5122287 © Baxi Heating UK Ltd 2012...

  • Page 52: 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 2012...
  • Page 53 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 2012...
  • Page 54 Error 130 flashing Go to section ‘M’ Close DHW tap DHW flow sensor senses no Operation sequence Fan stops after 10 seconds Pump runs for 30 seconds flow. Burner goes out successful © Baxi Heating UK Ltd 2012...
  • Page 55 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 3 & 4 Replace PCB © Baxi Heating UK Ltd 2012...
  • Page 56 1. Ignition electrode and lead (Note: from multimeter connect 2. Electrode connection ‘common’ to 2 & ‘volts’ to 5). Replace igniter 3. Spark gap and position Check wiring Burner Viewing Window Sensing Spark Ignition Electrode Electrode Electrode Position © Baxi Heating UK Ltd 2012...
  • Page 57 Cold resistance approximately 10kΩ @ 25° C (CH sensor) Replace sensor 20kΩ @ 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 2012...

  • Page 58: Benchmark Checklist

    Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This does not affect the customer’s statutory rights. If yes, and if required by the manufacturer, has a water scale reducer been fitted? CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 If the condensate pipe terminates externally has the pipe diameter been increased and weatherproof insulation fitted?

  • Page 59: 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.
  • Page 60 A T r a d in g D i v i s i o n o f B ax i H eat i ng U K L td ( 38 79 15 6) Brooks House, Coventry Road, Warwick. CV34 4LL After Sales Service 0844 871 1525 Technical Enquiries 0844 871 1555 Website www.baxi.co.uk e&oe UK Comp N 5122323 - Iss 12 - 4/12 © Baxi Heating UK Ltd 2012...

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