th em S an upp ua lie ls d lib by ra ry .c o .u k Installation & Servicing Instructions Baxi 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.
Natural Gas Building Regulations and the Benchmark Commissioning Checklist Baxi Duo-tec Combi 24 HE G.C.No 47 075 23 Baxi Duo-tec Combi 28 HE G.C.No 47 075 25 Baxi Duo-tec Combi 33 HE G.C.No 47 075 24 Baxi Duo-tec Combi 40 HE G.C.No 47 075 26 Building Regulations (England & Wales) require notification of the installation of a heating appliance to the relevant Local Authority Building Control Department.
Installer Notification Guidelines Choose Building Regulations Notification Route Competent Person's Self Certification Scheme Building Control Install and Commission this appliance to manufacturer's instructions Contact your relevant Local Authority Building Control (LABC) who will arrange an inspection or contact a government approved inspector Complete the Benchmark Checklist If you notify via CORGI Scheme, CORGI will then notify the relevant Local Authority Building Control Scheme on member's beha
Legislation IMPORTANT - Installation, Commissioning, Service & Repair This appliance must be installed in accordance with the manufacturer’s instructions and the regulations in force. Read the instructions fully before installing or using the appliance. In GB, this must be carried out by a competent person as stated in the Gas Safety (Installation & Use) Regulations.
Safe Manual Handling General The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance. Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly shoulders, arms and hands. Health & Safety is the responsibility of EVERYONE. There is no ‘safe’ limit for one man - each person has different capabilities.
CONTENTS Section 6 © Baxi Heating UK Ltd 2007 Page 1.0 Introduction 7 2.0 General Layout 8 3.0 Appliance Operation 9 4.0 Technical Data 10 5.0 Dimensions and Fixings 11 6.0 System Details 12 7.0 Site Requirements 15 8.0 Flue Options 19 9.0 Plume Displacement 24 10.0 Installation 28 11.0 Commissioning 33 12.0 Completion 35 13.0 Servicing 36 14.0 Changing Components 38 15.0 Combustion Check 47 16.0 Electrical 48 17.0 Short Parts List 49 18.
1.0 Introduction 1.1 Case Front Panel 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 domestic hot water. 2. The boiler is set to give a maximum output of :24 models - 24 kW DHW 25.9 kW CH (Condensing) 28 models - 28 kW DHW 25.9 kW CH (Condensing) 33 models - 33 kW DHW 30.3 kW CH (Condensing) 40 models - 40 kW DHW 34.4 kW CH (Condensing) 3.
2.0 General Layout 2.1 Layout 23 1 15 22 14 13 21 16 20 7 10 9 8 12 2 3 1. Expansion Vessel 2. Automatic Air Vent 3. DHW Plate Heat Exchanger 4. Circulation Pump 5. Drain Off Point 6. Pressure Relief Valve 7. Selector Switch 8. Central Heating System Pressure Gauge 9. PCB 10. Control Box 11. 3-Way Valve Assembly 12. Condensate Trap 13. Flame Sensing Electrode 14. Spark Electrode 15. Primary Heat Exchanger 16. Fan Assembly 17. On/Off/Reset Selector Switch 18.
3.0 Appliance Operation 1 3.1 Central Heating Circuit Central Heating Mode (Fig. 2) 27 1. With a demand for heating, the pump circulates water through the primary circuit. 2 3 4 7 26 20 5 6 25 24 18 2. Once main burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the temperature sensor. 3. When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling).
4.0 Technical Data 4.1 Appliance Type C13 Appliance Category C33 C53 CAT I 2H Heat Input CH (Net) 24 model kW 28 model kW 33 model kW 40 model kW Max 24.7 24.7 28.9 32.8 Min 7 9 9.7 9.9 Heat Input CH (Gross) 24 model kW 28 model kW 33 model kW 40 model kW Max 27.4 27.4 32.1 36.4 Min 7.8 10 10.8 11 Heat Output CH (Non-Condensing) Max 24 model kW 24 28 model kW 24 33 model kW 28 40 model kW 32 Heat Output CH (Condensing) Max 24 model kW 25.9 28 model kW 25.9 33 model kW 30.3 40 model kW 34.
5.0 Dimensions and Fixings Dimensions 1.5° to 3o A 780mm E G B 345mm C 450mm A D 116mm Ø Min. E 185mm (207mm for 80/125mm flue systems) F 145mm B G 131mm 360° Orientation H 180mm J H 270mm D C J Tube Ø 100mm F Tap Rail 32.
6.0 System Details 6.1 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. b) IRN 302 Byelaw 14. 2. Reference to the WRc publications, ‘Water fittings and materials directory’ and ‘Water supply byelaws guide’ give full details of byelaws and the IRNs. 6.
6.0 System Details 6.5 Stop Valve Double Check Valve 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. Stop Valve A filling loop & instructions are provided with the boiler DHW Mains Inlet Temporary Loop CH Return 2.
6.0 System Details 6.8 Domestic Hot Water Circuit (Fig. 7) 1. All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations. Other Tap Outlets Expansion Vessel Boiler 3. A single check valve must be fitted as shown in Fig. 7 to prevent backflow to the supply pipe and to ensure the efficient operation of the expansion vessel which is required to accommodate the thermal expansion of the water.
7.0 Site Requirements 450mm 5mm Min 5mm Min 7.1 200mm Min (300mm Min if using 80/125mm flueing system) 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 boiler should be fitted within the building unless otherwise protected by a suitable enclosure i.e. garage or outhouse.
7.0 Site Requirement Gas Service Cock 7.3 Ventilation of Compartments 1. Where the appliance is installed in a cupboard or compartment, no air vents are required. 2. BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation. 7.4 Gas Supply 1. The gas installation should be in accordance with the relevant standards. In GB this is BS 6891. In IE this is the current edition of I.S. 813 “Domestic Gas Installations”. Fig. 10 2.
7.0 Site Requirements Termination to an internal soil and vent pipe Boiler 50mm per me tre of 2.5° M inimum 7.7 Condensate Drain FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5° (50mm per metre) along the entire run. pipe ru n fall 1. The condensate outlet will accept 21.
Terminal Position with Minimum Distance (Fig. 12) (mm) 7.0 Site Requirements Aa Directly below an opening, air brick, opening windows, etc. Ba Above an opening, air brick, opening window etc. Ca Horizontally to an opening, air brick, opening window etc. D Below gutters, soil pipes or drain pipes. E Below eaves. F Below balconies or car port roof. G From a vertical drain pipe or soil pipe. H From an internal or external corner. I Above ground, roof or balcony level.
8.0 Flue Options 8.1 Horizontal Flue Systems 1. The standard flue is suitable only for horizontal termination applications. Y 2. All fittings should be fully engaged. The approximate engagement is 40mm. Apply soap solution to the seal on each fitting to aid assembly. X 3. Maximum permissible equivalent flue lengths are:(60/100) (80/125) Horizontal Concentric 10 metres 20 metres 4. Any additional “in line” bends in the flue system must be taken into consideration.
8.0 Flue Options 8.2 Vertical Flues (Twin Pipe) Twin & Vertical Flue Systems 1. Maximum permissible equivalent flue lengths are:- Vertical Concentric Vertical Twin Pipe Y (60/100) 10 metres 15 metres (80/125) 20 metres 2. Any additional “in line” bends in the flue system must be taken into consideration. Their equivalent lengths are:Concentric Pipes: 135° bend 0.5 metres 93° bend 1.0 metres Twin Flue Pipe 135° bend 0.25 metres 91.5° bend 0.
8.0 Flue Options 8.
8.0 Flue Options For Twin Flue Systems fit the adaptors as follows:- 8.4 Flue Duct Adaptor Blanking Plate Boiler Adaptor Flue Duct Adaptor 1. Engage the flue duct adaptor on the boiler adaptor, making sure that it is pushed down as far as possible. 8.5 Air duct adaptor 1. Undo the screws securing the blanking plate to the boiler top panel. Discard the plate. 2. There are three restrictor plates supplied in the kit.
8.0 Flue Options 8.6 1. In the case of a pitched roof 25 - 50 degrees, position the lead tile to replace/flash over existing roof tiling. Make an aperture in the roof suitable for the lower tube of the roof terminal and ensure the integrity of the roof cover is maintained. The adjustable plastic collar can either be positioned on the lead tile or the lower tube of the roof terminal prior to the final positioning of the vertical flue through the tile.
93° Elbow/Plume Outlet Assembly 9.0 Plume Displacement 60Ø Support Bracket O Ring 9.1 Kit No 5118638 Content of kit 1 0.9m 60/100 Concentric Flue 1 1m 60 Dia Exhaust Flue Pipe 1 Adaptor 2 60 Dia Support Brackets 1 93° Elbow/Plume Outlet Assembly 1 Flexible Flue Trim 3 “O” Rings 1 ‘Jubilee Clip 1 Elbow 0.9 metres 60Ø Exhaust Flue Pipe 60Ø Support Bracket O Ring Fig. 14a Plume Displacement Kit (Fig. 14b) Flexible Flue Trim 1.
16 14 14 12 60 Ø Exhaust (metres) X 16 24 10 8 28/ 33/ 40 6 4 4 0 2 3 4 5 28/ 33/ 40 6 6 7 8 0 9 1 Concentric 60/100 Flue (metres) Y 2 3 4 5 6 7 8 9 Concentric 60/100 Flue (metres) Y Example 1 Flue Lengths - Not Permissible Example 2 Flue Lengths - OK 14 24 10 8 28/ 33/ 40 6 4 Example 3 - Flue Lengths OK In the example shown, assume that the concentric part of the flue needs to be 2.3 metres long. Find the position of ‘2.
9.0 Plume Displacement 9.3 General Fitting Notes 1. Cut a hole in the external wall which the concentric flue assembly will pass through. The hole should allow the flue to fall back to the boiler at an angle of 1.5° to 3°. 2. When completed the terminal must be at least 2 metres above ground level (Fig. 19). Min. 2 metres 3. Measure and cut to size the concentric assembly and any extensions that are being used. 4. Insert the concentric assembly through the hole from outside the building. 5.
9.0 Plume Displacement Plume Outlet Elbow 9.3 General Fitting Notes (cont.) 15. For aesthetic purposes it is permissible to route the 60Ø exhaust in an enclosed box, but the air inlet and plume outlet MUST remain in free air. 16. It is also possible to separate the plume outlet from the 93° elbow to allow the flue to be installed as shown in Fig. 25. 50 0m m Mi n. 17. To do this, first slacken the two screws retaining the plume outlet to the elbow, and remove the outlet (Fig. 26).
10.0 Installation 10.1 Unpacking & Initial Preparation The gas supply, gas type and pressure must be checked for suitability before connection (see Section 7.4). Fig. 30 Fig. 31 Method 1 a) Remove the outer packaging and literature, and stand the boiler and inner packaging upright. Remove the base tray (Figs. 30, 31 & 32). b) Slide the upper polystyrene cap off the boiler. Break off the side and rear of the lower polystyrene cap. The wall plate can now be removed (Fig. 33).
Wall Plate 10.0 Installation 10.3 Fitting The Boiler 1. Lift the boiler using the lower polystyrene cap. The boiler should be lifted by TWO PEOPLE. Engage the slots at the top rear of the boiler on the wall plate (Fig. 36) (see Safe Manual Handling page 5). 2. Pull the lower polystyrene cap off the boiler (where used). Ease the boiler forwards and remove the sealing caps from the boiler connections. Suggested Lifting Points shown as shaded area Fig.
10.0 Installation m m 00 5 m 5m 31 10.6 Fitting The Flue HORIZONTAL TELESCOPIC FLUE 1. There are two telescopic sections, the Terminal Assembly and the Connection Assembly, a roll of sealing tape and two self tapping screws. A 93° elbow is also supplied. The outer duct of the Connection Assembly is painted white. On the Terminal Assembly the outer duct is unpainted. Terminal Assembly Connection Assembly Fig. 39 2. The two sections can be adjusted to provide a length between 315mm and 500mm (Fig.
10.0 Installation ’ ‘Y ion ens Dim 10.6 Fitting the Flue (Cont) Securing Screw 8. Adjust the two telescopic sections to dimension ‘Y’ (Fig. 42). Ensure that the rivets and holes in the Connection Assembly are aligned horizontally (Fig. 43). Fig. 42 ‘Peak’ to be uppermost 9. Using a 2mm bit, drill through the holes at the end of the Connection Assembly into the Terminal Assembly and secure them together using the screws supplied (Fig. 42). Seal the joint with the tape provided (Fig. 44). Fig.
10.0 Installation 10.7 Making The Electrical Connections The boiler is fitted with a 1.3m length of 3 core cable. This can be connected to the fused 3A 230V 50HZ supply. NOTE: Both the Live and Neutral connections are fused. To connect an external control proceed as follows:1. Slacken the facia panel securing screws and lift the outercase panel so that its securing tabs are clear of the facia. Remove the panel. Cable Clamp Fig. 49 2.
11.0 Commissioning Heat Exchanger Automatic Air Vent Fig. 51 11.1 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. IMPORTANT: The heat exchanger air vent on top of the boiler (Fig. 51) MUST be opened before filling the primary system. Screw 3. Open all hot water taps to purge the DHW system. Pump Automatic Air Vent 4.
11.0 Commissioning 11.3 x2 Checking 1. The gas valve is factory set and the burner pressure cannot be measured as it is altered by suction of the fan and modulates as demand on the boiler alters. The gas supply pressure should be 20mb. 2. If necessary the gas rate may be checked after running the boiler for 10 minutes with any other appliances and pilot lights turned off. Central Heating Temperature Control Fig. 55 Domestic Hot Water Temperature Control 3.
12.0 Completion 12.1 Case Front Panel Completion 1. Instruct the user in the operation of the boiler and system including the integral timer, explaining the operational sequence. 2. Set the central heating and hot water temperature control knobs to the requirements of the user. 3. Carefully read and complete all sections of the Benchmark Commissioning Checklist at the rear of this publication that are relevant to the appliance and installation.
13.0 Servicing 13 .1 Case Front Panel Annual Servicing 1. For reasons of safety and economy, it is recommended that the boiler is checked annually. Servicing must be performed by a competent person. If a combustion analyser is available the CO2 can be checked and adjusted - see Section 15.0. If the reading is acceptable, and a visual inspection of the appliance is satisfactory, it is not necessary to perform a full strip - down. 2.
13.0 Servicing 13.1 Burner Annual Servicing (Cont) Viewing Window 7. Undo the nut on the gas inlet pipe to the venturi (Fig. 65) and pull the sensing pipe off the fan. 7.5 ± 1 8. Disconnect the electrode leads, noting their position, and the fan electrical plugs (Fig. 66). 4 ± 0.5 9. Undo the four nuts retaining the combustion box cover to the heat exchanger. Electrode Position 10.
14.0 Changing Components Bracket Igniter Igniter Feed Plug IMPORTANT: When changing components ensure that both the gas and electrical supplies to the boiler are isolated before any work is started. When the component has been changed turn the selector switch fully anticlockwise against the spring pressure to the reset position and hold for 5 seconds to reset the boiler before recommissioning. See Section 13.1 “Annual Servicing” for removal of case panel, door etc. 14.1 Electrode Leads Igniter (Fig.
14.0 Changing Components 14.3 Fan (Fig. 71) 1. Undo the nut on the gas inlet pipe to the venturi (Fig. 49) and pull the sensing pipe off the fan. 2. Disconnect the electrode leads, noting their position and disconnect the fan electrical plugs. 3. Undo the screws securing the collector to the extension piece. 4. Remove the collector and fan assembly, being careful to retain the injector in the venturi. 5. Undo the screws securing the fan to the venturi and fit the new fan, replacing the seal if necessary.
14.0 Changing Components Cover 14.6 Burner Burner (Fig. 74) 1. Undo the screws securing the collector to the venturi and extension piece. Remove this extension piece from the cover (on 24 and 28 models). Gasket Extension Piece (Not on 33 & 40 models) 2. Withdraw the burner from the cover and replace with the new one. 3. Examine the gasket, replacing if necessary. 4. Reassemble in reverse order. Venturi 14.7 Insulation (Fig. 75) 1. Remove the electrode leads, noting their positions.
14.0 Changing Components 14.8 Electrical Plug Flue/Heat Exchanger Thermostat Sensor Flue/Heat Exchanger Thermostat Sensor (Fig. 76) 1. Ease the retaining tab on the sensor away and disconnect the electrical plug. 2. Turn the sensor 90o anticlockwise to remove - it is a bayonet connection. 3. Reassemble in reverse order. 14.9 Fig. 76 Water Pressure Sensor (Fig. 78) 1. Drain the primary circuit. 2. Disconnect the two wires from the sensor. 3.
14.0 Changing Components 14.13 Pump - Head Only (Fig. 79) 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. Using a suitable flat bladed screw driver press the cable securing levers downwards to release each wire after noting their position. 3. A standard replacement Grundfos 15-60 head can now be fitted. Connect the pump wiring to the new head.
14.0 Changing Components 14.16 Gauge Retaining Bracket Pressure Gauge (Figs. 82 & 83) 1. Drain the primary circuit and undo the nut on the pressure gauge capillary. 2. Undo the screws securing the gauge retaining bracket. Pressure Gauge Fig. 83 3. Remove the bracket and gauge assembly. Depress the barbs on the side of the gauge and remove the retaining bracket. 4. Examine the sealing washer, replace if necessary. 5. Reassemble in reverse order. 14.17 Hall Effect Sensor (Fig. 84) 1.
14.0 Changing Components 14.19 Plate Heat Exchanger (Fig. 86) 1. Drain the primary circuit and remove the gas valve as described in section 14.23. Plate Heat Exchanger 2. While supporting the heat exchanger undo the screws securing it to the brass manifolds. 3. Withdraw the heat exchanger upwards, taking care not to damage any wires or controls. Seals 4. There are four rubber seals between the manifolds and heat exchanger which may need replacement. LH Location Stud Fig. 86 5.
14.0 Changing Components 14.21 P.C.B. (Fig. 90) 1. Note the settings of the temperature control knobs, rotate them fully anticlockwise and carefully pull them off the drive pins. 2. Completely undo the screws securing the control box cover and release the cover retaining barbs from their slots. Disengage the rear of the cover from the control box hinge pin (Fig. 89). 3. Note the position of all plugs and wires on the P.C.B. and disconnect them. 4. Undo the securing screws and remove the P.C.B.
14.0 Changing Components 14.23 Venturi Inlet Pipe Outlet Adaptor Gas Valve (Fig. 91) IMPORTANT: After replacing the valve the CO2 must be checked and adjusted as detailed in Section 15.0 Combustion Check. Only change the valve if a suitable calibrated combustion analyser is available. 1. Turn the gas cock off and undo the nut on the gas feed elbow under the boiler. Gas Valve Sensing Pipe 2. Remove the screws securing the inlet pipe flange to the boiler bottom panel. 3.
15.0 Combustion Check x2 15.1 Checking the CO2 IMPORTANT: The CO2 must be only be checked and adjusted if a suitable calibrated combustion analyser is available. 1. The combustion (CO2) may be checked after running the boiler for several minutes. To do this it is necessary to set the boiler to ‘Calibration Mode’. Central Heating Temperature Control Selector Switch 2. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
16.0 Electrical 16.
17.0 Short Parts List Short Parts List Key No.
18.0 Fault Finding 18.1 NOTE: When instructed to turn the selector to the reset position turn the selector switch fully anticlockwise against the spring pressure to the reset position and hold for 5 seconds to reset the boiler. Initial Fault Finding Checks 1. Check that gas, water and electrical supplies are available at the boiler. 2. Electrical supply = 230V ~ 50 Hz. 3. CH water system pressurised to 0.5 bar minimum when the boiler is cold. 4. The preferred minimum gas pressure is 20 mbar. 5.
18.0 Fault Finding Refer to Section 16.0 “Illustrated Wiring Diagram” for position of terminals and components Central Heating - Follow operational sequence Turn selector switch to The display illuminates NO Go to section ‘A’ YES Error 110 flashing Error 130 flashing Error 133 flashing YES Turn the selector switch to reset position for 5 seconds YES If the error 110 is still flashing.
18.0 Fault Finding Domestic Hot Water - Follow operational sequence Turn selector switch to The display illuminates NO Go to section ‘A’ YES Error 110 flashing Error 133 flashing YES Turn the selector switch to reset position for 5 seconds YES If the error 110 is still flashing. Go to section ‘J’ NO YES Error 20, 28 or 50 flashing Go to section ‘E’ NO YES Error 119 flashing Go to section ‘C’ Go to section ‘B’ NO YES Turn Domestic Hot Water thermostat to Maximum. Open DHW tap fully.
18.0 Fault Finding Fault Finding Solutions Sections A Is there 230V at: 1. Main terminals L and N 2. Main terminal fuse 3. B NO Check electrical supply NO Replace fuse NO Check wiring PCB - X1 connector terminals 1,2 NO Display illuminated Replace PCB Is there 230V at: YES 1. Pump 2. PCB - X3 connector terminals 3 & 4 NO If pump jammed, release NO Replace pump Replace PCB YES Change pump supply cable C 1. YES CH system pressure less than 0.5 bar NO 2. D 1.
18.0 Fault Finding E F Temperature sensors faulty. Cold resistance approximately 10kΩ @ 25° C (DHW and CH sensors) 20kΩ @ 25° C (Flue sensor) (resistance reduces with increase in temp.) 1. 2. NO Replace sensor Check and correct the connection of the tube between the venturi and gas valve Gas at burner NO Ensure gas is on and purged PCB - X3 connector is 230V AC across terminals 1 & 2 YES Replace gas valve NO Replace PCB G 1. Ensure that the Hall Effect Sensor is in position.
18.0 Fault Finding I 1. 2. Check the gas supply pressure: For Natural Gas greater than 10 - 11 mbar Check and correct if necessary 1. The mechanical set of the gas valve (CO2 values - see instruction) 2. Flame sensing electrode and lead connections 3. Flame sensing electrode position YES Flame current should be more than 0.5 μA J 1. Overheat thermostat operated or faulty, i.e. continuity across thermostat terminals NO NO Replace PCB Replace flame sensing electrode Allow to cool.
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BENCHMARK No. 5 1 2 2 3 2 3 1.0 Introduction GAS BOILER COMMISSIONING CHECKLIST COLLECTIVE MARK BOILER SERIAL No. NOTIFICATION No.
SERVICE INTERVAL RECORD It is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record Below. Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service as described in the boiler manufacturer’s instructions. Always use the manufacturer’s specified spare part when replacing all controls SERVICE 1 DATE SERVICE 2 DATE ENGINEER NAME COMPANY NAME TEL No.
All descriptions and illustrations provided in this leaflet have been carefully prepared but we reserve the right to make changes and improvements in our products which may affect the accuracy of the information contained in this leaflet. All goods are sold subject to our standard Conditions of Sale which are available on request. BAXI A Tr a din g D i v i s i o n of B a x i Heat i ng U K Lt d Brooks House, Coventry Road, Warwick.
User’s Operating Instructions & Important Warranty Information Baxi Combi HE Range Gas Fired Wall Mounted Condensing Combination Boiler Please keep these instructions in a safe place. If you move house, please hand them over to the next occupier.
Contents Section Natural Gas Baxi Duo-tec Combi 24 HE G.C.No 47 075 23 Baxi Duo-tec Combi 28 HE G.C.No 47 075 25 Baxi Duo-tec Combi 33 HE G.C.No 47 075 24 Baxi Duo-tec Combi 40 HE G.C.No 47 075 26 Page 1.0 Quick Reference Guide 3 2.0 Troubleshooting 4 3.0 Repressurising System 6 4.0 Clearances 7 5.0 Care of the Boiler 8 6.0 Legislation 9 7.0 Notes 10 8.0 Emergency 11 9.0 Warranty & Service 12 © Baxi Heating UK Ltd 2007 All rights reserved.
1.0 Quick Reference Guide 2 1 3 4 0 bar ON/OFF/Reset Selector Switch Display Central Heating Temperature Control Domestic Hot Water Temperature Control System Pressure Gauge Position of Optional Timer OFF Position Central Heating & Hot Water Reset The boiler will not operate. Both Heating & Hot Water will operate. Hold for approx 5 seconds and release. Central Heating Indicator - The indicator will illuminate when the boiler is in the central heating mode.
Boiler not working 2.0 Troubleshooting START Make sure the gas supply is turned ON and check if other gas appliances are operating (e.g. fire, cooker). Is the ON/OFF/Reset Select Switch in the ( ) position ? YES Is the ( ) or ( ) light on and the ( ) on ? YES Domestic Hot Water Indicator Central Heating Indicator NO NO If no gas, consult your supplier. Is the display lit ? YES Burner On Indicator Boiler operating satisfactorily. Display NO Check electricity to the boiler is switched on.
2.0 Troubleshooting Is the Timer ON and calling for heat ? 12 Is the Room Thermostat (if fitted) set high enough ? 10 15 20 25 4 8 5 3 9 2 5 6 7 Typical examples of external timer YES 1 10 11 YES CH ON CH OFF NO Turn Room Thermostat to maximum setting (typical example shown). NO 5 10 15 20 25 Ensure timer is set for Central Heating ON (see any instructions supplied with timer). CONTACT YOUR INSTALLER OR SERVICE ENGINEER.
3.0 Repressurising System 3.1 Central Heating System Pressure 1. The normal operating water pressure is between 1 and 2.5 bar (Fig. 1). If the pressure exceeds 3 bar the safety pressure valve will operate and a fault is indicated. Contact your installer. 2 1 3 4 0 bar Normal Pressure Fig. 1 2. It may be necessary to repressurise the system occasionally (Fig. 2). A filling device (the filling loop) will be fitted on the system. This will be on the boiler itself, or on pipework near to the boiler. 3.
4.0 Clearances 450mm 5mm Min 5mm Min 200mm Min (300mm Min if using 80/125mm flueing system 4.1 For your Safety 1. This appliance must have been installed in accordance with the manufacturer’s instructions and the regulations in force. 2. Any modification that may interfere with the normal operation of the appliance without express written permission from the manufacturer or his agent could invalidate the appliance warranty.
5.0 Care of the Boiler 5.1 Cleaning the Outer case The painted panels should be wiped with a damp cloth and then dried completely. DO NOT USE ABRASIVE CLEANING AGENTS. 5.2 Protection & Precaution 1. The boiler incorporates an integral frost protection feature that will operate in both modes. If the boiler temperature falls below 5° C, then the boiler will operate until the water temperature has been raised. 2.
6.0 Legislation 6.1 Installation, Commissioning, Service & Repair 1. This appliance must be install in accordance with the manufacturer’s instructions and the regulations in force. Read the instructions fully before installing or using the appliance. 2. In GB, this must be carried out by a competent person as stated in the Gas Safety (Installation & Use) Regulations. 3.
7.
8.0 Emergency Warning ! If you smell gas Turn off the gas supply at the meter and call your gas supplier immediately. It is possible to isolate the boiler and at the isolating valve (Fig. 8). In GB, Transco operate a 24 hour emergency service and the telephone number will be listed in your telephone directory. Faulty boiler If it is known or suspected that a fault exists on the boiler, it must not be used until the fault has been corrected by a competent person.
Please complete the boxes below 9.0 Warranty & Service Serial Number Standard Warranty Terms & Conditions To activate your second year free warranty you must register your boiler with heateam the service division of Baxi Heating UK Ltd either by completing and returning the registration card or calling our telephone registration line on 08706 000 653.
