Baxi 124 Combi Installation And Service Manual
  1. Manuals
  2. Brands
  3. Baxi Manuals
  4. Boiler
  5. 124 Combi
  6. Installation and service manual

Baxi 124 Combi Installation And Service Manual

Condensing combination boiler
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
United Kingdom
en
Installation and Service Manual
Condensing Combination Boiler
124 - 128
Combi
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.

Advertisement

Table of Contents
loading

Related Manuals for Baxi 124 Combi

Summary of Contents for Baxi 124 Combi

  • Page 1 United Kingdom Installation and Service Manual Condensing Combination Boiler 124 - 128 Combi 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 Building Regulations only relates to dwellings. Therefore the checklist only applies if the appliance is © Baxi Heating UK Ltd 2017 All rights reserved. No part of this publication may being installed in a dwelling or some related structure.
  • Page 3 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 2017...
  • Page 4 Codes of Practice - refer to the most recent version EC - Declaration of Conformity Baxi Heating UK Limited being the manufacturer / distributor within the European In GB the following Codes of Practice apply: Economic Area of the following...
  • 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 2017...

  • Page 6: Table Of Contents

    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 External Low Voltage Controls 19.0 ‘Service Due’ Message Benchmark Checklist © Baxi Heating UK Ltd 2017...

  • Page 7: Introduction

    1.0 Introduction Description 1. The Baxi Combi 100 Range are fully automatic gas fired wall mounted condensing combination boilers. They are room sealed and fan assisted, and will serve central heating and mains fed domestic hot water. 2. The boiler is set to give a maximum output of :- 24 models - 24 kW DHW 21.2 kW CH Pnc (Condensing)

  • Page 8: General Layout

    Spark Ignition Electrode Combustion Box Cover & Burner Control Box Display Condensate Trap Safety Pressure Relief Valve Gas Valve Diverter Valve Motor Boiler Control Optional Timer Boiler Drain Tap Heating Flow Sensor Safety Thermostat © Baxi Heating UK Ltd 2017...

  • Page 9: Appliance Operation

    1 minute to prevent A – Condensate Drain sticking. B – Heating Flow C – Domestic Hot Water Outlet D – Gas Inlet E – Cold Water Inlet On/Off Valve and filter F – Heating Return © Baxi Heating UK Ltd 2017...

  • Page 10: Technical Data

    (Appliance must be connected to an Pump - Available Head earthed supply) Power Consumption 24 model 28 model NOTE: All data in this section are nominal values and subject to normal production tolerances. 1000 1200 © Baxi Heating UK Ltd 2017 Flow Rate (l/h)
  • Page 11 50°C return temperature (at heater inlet) (2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet. S S ee The back cover for contact details. © Baxi Heating UK Ltd 2017...

  • Page 12: Dimensions And Fixings

    Hot Water Cold Water Heating Flow Outlet Inlet Inlet Return (22mm) (15mm) (22mm) (15mm) (22mm) Pressure Relief Valve (15mm) Condensate Drain 40 mm 65 mm 65 mm 65 mm 65 mm 65 mm 162,5 mm © Baxi Heating UK Ltd 2017...

  • Page 13: System Details

    6.0 System Details Information 1. The Baxi 100 range of Condensing Combination Boilers are ‘Water Byelaws Scheme - Approved Products’. 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 14 5. A boiler discharge pump is available, part no. 720648301. Discharge Pipe This pump will dispose of both condensate & high temperature water from the relief valve. It has a maximum head of 5 metres. © Baxi Heating UK Ltd 2017...
  • Page 15 (e.g. fitting of a water system connected to a Baxi 124/128 Combi it is meter) should be considered and an expansion vessel fitted. Baxi strongly recommended that the DHW flow rate cannot accept any responsibility for damage to the boiler if these DOES NOT fall below 2.5l/min.

  • Page 16: 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 2017...
  • Page 17 In IE reference should be made to the current edition of 2.25 m Zone 1 I.S. 813 “Domestic Gas Installations” and the current ETCI Zone 2 rules. Zone 0 0.6 m Fig. B In GB Only © Baxi Heating UK Ltd 2017...
  • Page 18 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 2017...
  • 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 2017...
  • Page 20 (see Top View Rear Flue Fig. 13). Fig. 11 Property Boundary Line Air Inlet Opening Window or Door 150mm Fig. 13 MIN. Likely flue positions requiring Fig. 12 a flue terminal guard © Baxi Heating UK Ltd 2017...

  • Page 21: Flue Options

    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 2017...
  • Page 22 Fig. 15 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 2017...

  • Page 23: Installation

    4. Insert the sealing washers between the valves, boiler Remove Sealing Caps from connections and copper tails. under the Boiler before lifting into position 5. Tighten all the connections. Heating Flow Outlet Heating Cold Water Fig. 21 Return Inlet © Baxi Heating UK Ltd 2016...
  • Page 24 3. The boiler condensate trap should be primed by pouring approximately 300ml of water into the flue spigot (Fig. 22a). Do not allow any water to fall into the air inlet. © Baxi Heating UK Ltd 2017...
  • Page 25 9. Using the clearance holes in the Connection Assembly secure it to the Terminal Assembly using the screws supplied (Fig. 28). Fig. 26 ‘TOP’ Label Securing Screw Sealing Tape Fig. 28 Fig. 27 ‘TOP’ Label © Baxi Heating UK Ltd 2017...
  • Page 26 13. Make good between the wall and air duct outside the building, appropriate to the wall construction and fire rating. 14. If necessary fit a terminal guard (see Section 8.4). Fig. 30 Fig. 30 Slots at bottom Slots at bottom Fig. 31 Fig. 31 © Baxi Heating UK Ltd 2017...
  • Page 27 2 at the boiler. Live, Neutral and Earth to power 2. These should be performed using a suitable meter, and these controls must be taken from the Fused Spur. include checks for Earth Continuity, Resistance to Earth, Short Circuit and Polarity. © Baxi Heating UK Ltd 2017...

  • Page 28: Commissioning

    • The integrity of the flue system and the flue seals. must be pressed before & • The integrity of the boiler combustion circuit and the relevant seals. Proceed to put the boiler into operation as follows: © Baxi Heating UK Ltd 2017...
  • Page 29 Ensure test points are capped, the calling 0344 871 1545. 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 2017...
  • Page 30 4. Press to select the value that corresponds with the required When reset for L.P.G. gas type. For Natural Gas:- For Propane:- 5. Press to save the change, then to return to the normal display. © Baxi Heating UK Ltd 2017...

  • Page 31: Completion & System Draining

    & hot water. This will purge air from the system. The display will show 5. Once De-Aeration is complete set the external controls as required by the user. © Baxi Heating UK Ltd 2017...

  • Page 32: Servicing

    4. Disconnect the condensate drain elbow and unscrew the sump from the bottom of the condensate trap assembly (Fig. 44). Remove any deposits from the sump and trap. Clean as necessary and replace the sump. © Baxi Heating UK Ltd 2017...
  • Page 33 Benchmark Commissioning Checklist at the rear of this publication and then hand it back to the user. 18. Reassemble in reverse order, ensuring the front case panel is securely fitted. Fig. 48 Fig. 47 Inlet/Return Manifold DHW Isolation Cock © Baxi Heating UK Ltd 2017...

  • Page 34: Changing Components

    Venturi 5. Examine the gasket and replace if necessary. Gasket 6. After changing the venturi check the combustion - see Section Fig. 51 14.1. © Baxi Heating UK Ltd 2017...
  • Page 35 Keep the insulation vertical and press firmly into position. Air/Gas Collector 8. Examine the cover seal and replace if necessary. Reassemble in reverse order. Spark Ignition Electrode Cover Insulation Seal Fig. 53 Electrode Flame Sensing Leads Electrode © Baxi Heating UK Ltd 2017...
  • Page 36 3. Remove the retaining clip and withdraw the sensor from the hydraulic outlet assembly. Examine the ‘O’ ring, replacing if necessary. Fig. 55 4. Reassemble in reverse order. The plug will only fit one way. Retaining Clip Fig. 56 DHW NTC Sensor © Baxi Heating UK Ltd 2017...
  • Page 37 2. The automatic air vent is a bayonet fitting. Remove by twisting anticlockwise. 3. Fit the new automatic air vent, ensuring the ‘O’ ring is fitted and the cap is open . Reassemble in reverse order. Fig. 58 © Baxi Heating UK Ltd 2017...
  • Page 38 Reassemble in reverse order and ensure the gauge is firmly in position to maintain the integrity of the case seal. Control Box removed for clarity Heating Pressure Gauge Heating Pressure Gauge Capillary Clip Fig. 60 Fig. 61 © Baxi Heating UK Ltd 2017...
  • Page 39 The clip is captive and does not need to be fully removed. 3. Reassemble in reverse order. Fig. 63 Securing Clip (captive) Plate Heat Exchanger Securing Screws Pump, Gas Valve Assemblies and Pipework removed for clarity © Baxi Heating UK Ltd 2017...
  • Page 40 5. When fitting the new motor it will be necessary to hold the unit firmly while depressing the valve return spring. 14.25 Pump, Gas Valve Assemblies and Pipework removed for clarity Securing Clip Electrical Plug Fig. 66 Diverter Valve Motor © Baxi Heating UK Ltd 2017...
  • Page 41 7. P.C.B. & R.D.S. changed - enable the Calibration Function as described in Section 14.2, then Check the Combustion - see Section 14.1. Note the correct orientation of the R.D.S. Position with the chamfer as shown. © Baxi Heating UK Ltd 2017...
  • Page 42 7 . Whilst supporting the vessel undo the locknut and manoeuvre the vessel out of the boiler. 8. Reassemble in reverse order. © Baxi Heating UK Ltd 2017...

  • Page 43: Combustion & Calibration

    6 seconds to exit the function. intervals. ‘ESC’ 5. To exit the function press will be displayed and the calibration function completed. © Baxi Heating UK Ltd 2017...

  • Page 44: Electrical

    Diverter Valve Motor Key To Wiring Colours b - Blue r - Red bk - Black g - Green br - Brown g/y - Green/Yellow w - White y - Yellow gr - Grey © Baxi Heating UK Ltd 2017...

  • Page 45: Short Parts List

    R.D.S. - 24 7681033 R.D.S. - 28 7678783 R.D.S. - 24 LPG 7681034 R.D.S. - 28 LPG 7678794 Injector Washer - 24 (Ø 4.4) 720751701 Injector Washer - 28 (Ø 4.6) 720775801 Air/Gas Venturi 720768301 © Baxi Heating UK Ltd 2017...

  • Page 46: Fault Finding

    110, 125, 133, 134, 135, 09, 15, 128 & 384 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 2017...
  • Page 47 Go to section ‘K’ Heating circuit Check Heating Flow sensor. Burner modulates to maintain set temperature Go to section ‘D’ Go to section ‘M’ 130 flashing Fan stops after 10 seconds Boiler operation correct Burner goes out © Baxi Heating UK Ltd 2017...
  • Page 48 Domestic Hot Water circuit Burner modulates to maintain Check CH NTC sensor. set temperature Go to section ‘D’ Go to section ‘M’ 130 flashing Fan stops after 10 seconds Boiler operation correct Burner goes out © Baxi Heating UK Ltd 2017...
  • Page 49 Replace sensor (resistance reduces with increase in temp.) Gas at burner Ensure gas is on and purged Replace gas valve & Check wiring and PCB - X36 connector Check combustion see Wiring Diagram Replace PCB © Baxi Heating UK Ltd 2017...
  • Page 50 Check for and correct any faulty system faults Allow to cool. Continuity across thermostat terminals Replace safety thermostat more than 1.5 ohm Check Flow & Return Sensors - 110 still flashing ? see section ‘D’ Replace PCB © Baxi Heating UK Ltd 2017...
  • Page 51 Cold resistance approximately 10kΩ @ 25° C (CH sensor) Replace sensor 20kΩ @ 25° C (Flue sensor) (resistance reduces with increase in temp.) If pump is running the heat exchanger could be Replace heat exchanger obstructed © Baxi Heating UK Ltd 2017...

  • Page 52: External Low Voltage Controls

    18.0 External Low Voltage Controls © Baxi Heating UK Ltd 2017...
  • Page 53 18.0 External Low Voltage Controls Baxi Optional Outdoor Sensor 1/2 H 2.5m Min West North Low Voltage Terminal Block ODS Connection Boiler Flow Temperature Outdoor Temperature © Baxi Heating UK Ltd 2017...
  • Page 54 18.0 External Low Voltage Controls Baxi Optional 7 Day Wired Sensor 1. Press Securing Tab 18.6 Connecting the Optional 7 Day Wired Sensor NOTE: The yellow link wire between terminals 1 & 2 on 2. Ease away from Backplate terminal block M1 MUST be removed when fitting the 7 Day Wired Sensor.
  • Page 55 18.0 External Low Voltage Controls Baxi Optional 7 Day Wireless Sensor & 24hr Wireless Sensor 18.7 Connecting the Optional 7 Day Wireless Sensor & 24hr Wireless Sensor (kit includes a Sensor & 1. Press Securing Tab. Receiver - the Receiver is wired into the boiler).

  • Page 56: Service Due' Message

    Press ‘22’ 10. Press until is displayed again. Press ‘50’ Using scroll through to . Press ‘11’ 11. Press until is displayed. Confirm with then press to return the display to normal. © Baxi Heating UK Ltd 2017...
  • Page 57 Notes © Baxi Heating UK Ltd 2017...

  • Page 58: 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 59 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 60 For the warranty to be maintained, please make sure... Benchmark checklist is completed Warranty is registered within 30 days 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:

128 combi

Table of Contents