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www.hhic.co.uk

Benchmark Commissioning & 

Warranty Validation Service Record

It is a requirement that the boiler is installed and commissioned to the manufacturers’ 

instructions and the data fields on the commissioning checklist completed in full. 

To instigate the boiler warranty the boiler needs to be registered with the 

manufacturer within one month of the installation. The warranty rests with the 

end-user (consumer), and they should be made aware it is ultimately their 

responsibility to register with the manufacturer, within the allotted time period.

It is essential that the boiler is serviced in line with the manufacturers’ 

recommendations, at least annually. This must be carried out by a competent Gas 

Safe registered engineer. The service details should be recorded on the Benchmark 

Service and Interim Boiler Work Record and left with the householder. Failure to 

comply with the manufacturers’ servicing instructions and requirements will invalidate 

the warranty.

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 manufacturers’ instructions and complete this Benchmark Commissioning Checklist will invalidate the 

warranty. This does not affect the customer’s statutory rights.

© Heating and Hotwater Industry Council (HHIC) 

Summary of Contents for COMBI 224

Page 1: ...NOLVW DQG VKRXOG EH OHIW ZLWK WKH XVHU IRU VDIH NHHSLQJ 7KH PXVW EH UHDG LQ FRQMXQFWLRQ ZLWK WKH OXH QVWDOODWLRQ XLGH United Kingdom en Installation and Service Manual High efficiency wall hung conden...

Page 2: ...sing the product and keep it in a safe place for later reference In order to ensure continued safe and efficient operation we recommend that the product is serviced regularly Our service and customer...

Page 3: ...m 20 4 3 MAIN COMPONENTS 20 4 4 Control panel description 21 4 4 1 Description of the control panel 21 4 5 Contents of the package 21 4 6 Accessories options 21 5 Before installation 22 5 1 Installati...

Page 4: ...on of the boiler 26 5 6 1 Unpacking 34 5 5 Transport 33 5 4 2 Bath and shower rooms 26 5 4 3 Ventilation 27 5 4 4 Condensate drain 27 5 4 5 Clearances 29 5 4 6 Flue chimney location 29 5 4 7 Horizonta...

Page 5: ...de replacement 70 10 4 2 Dismantling the water water exchanger 70 10 4 3 Replacing the 3 way valve 70 10 4 5 Replacing the expansion vessel 71 11 Troubleshooting 72 11 1 Temporary and permanent faults...

Page 6: ...er The relevant section of Building Regulations only relates to dwellings Therefore the checklist only applies if the appliance is being installed in a dwelling or some related structure The flowchart...

Page 7: ...the relevant LABC You must ensure that the certificate number issued by the Gas Safe Register is written onto the Benchmark Checklist Scheme Members only Call Gas Safe Register on 0800 408 5577 or lo...

Page 8: ...3 Trace possible leaks and seal them immediately Warning Do not touch the flue gas pipes Depending on the boiler settings the temperature of the flue gas pipes may exceed 60oC Warning Do not touch the...

Page 9: ...d in any way 1 4 Specific safety instructions 1 4 1 Handling General The following advice should be adhered to from when first handling the boiler to the final stages of installation and also during m...

Page 10: ...ollowing cases Failure to abide by the instructions on installing the appliance Failure to abide by the instructions on using the appliance Faulty or insufficient maintenance of the appliance 1 5 2 In...

Page 11: ...e note important information See Reference to other manuals or pages in this manual 2 About this manual 2 1 General 11 2 4 Abbreviations Glossary BS CH DHW GB British Standard Central heating Domestic...

Page 12: ...s They also require the production process to be covered by an approved and monitored system of quality assurance Standard Scope BS 6891 Gas Installation BS 5546 Installation of hot water supplies for...

Page 13: ...temperature boiler 1 No No B1 boiler No No 3 2 1 Technical information Important All data in these sections are nominal and subject to normal pro duction tolerances Combination heater Yes Yes Rated he...

Page 14: ...temperature setting means 60 C return temperature at boiler inlet and 80 C flow temperature at boiler outlet Tab 6 General 224 Combi 2 228 Combi 2 Rated heat input Qn for domestic hot water kW 24 7 2...

Page 15: ...G20 gas consumption Qmax with domestic hot water tank m3 h G20 gas consumption Qmin m3 h 0 52 0 63 Diameter of separate discharge pipes mm 80 80 80 80 Diameter of coaxial discharge pipes mm 60 100 60...

Page 16: ...3 Safety valve Heating circuit flow fitting G3 4 Fitting for condensate discharge 4 DHW Domestic Hot Water outlet fitting G1 2 5 Gas inlet fitting G3 4 6 Domestic cold water inlet fitting G1 2 7 Heati...

Page 17: ...Fig 4 Paper template 3 Technical specifications 17 Combi 2...

Page 18: ...tat ST Installation return temperature SRT Installation flow temperature SFL Flue gas temperature FS X8 Sensors DHW flowmeter HS Heating circuit pressure switch SP Pump PWM signal PWM PUMP X9 CAN conn...

Page 19: ...nergy 4 2 2 Combustion The burner heats the heating water circulating in the heat exchanger When the temperature of the combustion gas is lower than the dew point around 55 C the water vapour containe...

Page 20: ...venting valve 12 Pump 13 Cable gland 14 Control panel with boiler PCB and display 15 Domestic hot water plate heat exchanger fastening screws 16 Domestic hot water priority sensor 17 Domestic hot wate...

Page 21: ...s User menu user level parameters can be configured Installer menu installer level parameter can be configured Error menu errors can be read out Counter menu various counters can be read out Knobs HEA...

Page 22: ...rules In GB this is the current IEE Wiring Regula tions In IE reference should be made to the current edition of ETCI rules The mains supply is 230V 50Hz fused at 3A Important The method of connection...

Page 23: ...stem which can lead to damage of system components BS 7593 gives extensive recommendations on system cleansing and wa ter treatment All systems must be thoroughly drained and flushed out using appropr...

Page 24: ...in excess of 3 bar and temperature in ex cess of 100 C The pressure relief discharge pipe should be not less than 15mm diame ter run continuously downward and discharge outside the building pref erab...

Page 25: ...ating mode To prevent flow noise you must pay attention to the hydraulic design of the heating installation The system uses a high head modulating pump that is suitable for use on any type of one or t...

Page 26: ...edition of IS 813 Domestic Gas Installations and the current ETCI rules It is not necessary to protect any surface the boiler is mounted on from heat generated during normal operation unless required...

Page 27: ...500mm mimimum Basement or similar heated Condensate pump Unheated Location e g Garage Tab 18 Examples are shown of the following methods of termination Key Description A Termination to an internal so...

Page 28: ...ing suitably spaced clips of the correct design to prevent sagging It is advisable that the full length of condensate pipe is run internally and preferably be less than 3 metres Internal runs greater...

Page 29: ...For GB recommendations are given in BS 5440 Pt 1 For IE recommendations are given in the current edition of I S 813 Do mestic Gas Installations Important Due to the nature of the boiler a plume of wa...

Page 30: ...built in element such as a window frame 2 Only ONE 25mm clearance is allowed per installation If one of the dimension D E F G or H is 25mm then the remainder MUST be as shown in brackets in accordanc...

Page 31: ...bow to terminal without the need for cutting Extensions of 250mm 500mm and 1m are available All fittings should be fully engaged The approximate engagement is 40mm Apply the lubricant supplied to the...

Page 32: ...fit accesso ry part no 720627901 can be used Important This guard is not compatible with Flue Deflector referred to below There must be a clearance of at least 50mm between any part of the ter minal a...

Page 33: ...roduct code Product name Model name s n Serial number Fig 23 Position of the data plate BO 0000234 BRAND Qn Hi Pn 80 60 C Pn 50 30 C PMS PMW D NOx 4 9 24 7 4 8 24 kW kW kW kW kW kW 4 9 20 6 4 8 20 5 2...

Page 34: ...unpacking or lifting the boiler To unpack the boiler 1 Remove the banding and the cardboard sleeve 2 Remove the polystyrene top piece and installation kit 3 Snap off the rear part of the polystyrene...

Page 35: ...ckflow pre vention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use When the optional permanent filling link is fitted it is not necessary...

Page 36: ...ny outlet fittings such as a shower valve may require a lower maximum pressure The pressure reduction must take account of all fittings connected to the DHW system 5 Before installation 36 The Water R...

Page 37: ...to the heating flow and return pipework gas supply and mains cold inlet 6 Connect the elbow to the DHW flow outlet 7 Using the sealing washers provided connect the taps and elbow to the boiler 8 Ensur...

Page 38: ...tric 60 100 1 2 3 315mm to 500mm Connection assembly Terminal assembly There are two telescopic sections the terminal assembly and the connec tion assembly a roll of sealing tape and two self tapping...

Page 39: ...nd flue 10 Ensure that the terminal is positioned with the slots to the bottom Secure to the elbow with the screws supplied with the telescopic flue Important It is essential that the flue terminal is...

Page 40: ...e figure and feed the wire into the hole Connect the wire then secure the cable gland in place by tightening the screw 1 The supply cable is connected to the terminal board as shown in the figure belo...

Page 41: ...low voltage device This wiring is NOT supplied in the kit 4 If it is not possible to pass the wiring through the wall directly behind remove the circular knock out panel in the sensor base to allow co...

Page 42: ...dance with all relevant water supply regulations Important Your attention is drawn to for GB Guidance G24 2 and recommendation R24 2 of the Wa ter Regulations Guide for IE the current edition of I S 8...

Page 43: ...tat and the other external components 8 Check the ventilation in the room in which the system is installed 9 Check the flue gas connections 7 3 Commissioning procedure Proceed as described below to co...

Page 44: ...te can be found in section 3 Technical specifications Fig 47 Gas inlet test point 7 4 2 Combustion parameters The boiler has two dedicated sockets in order to measure the combustion efficiency and cle...

Page 45: ...ow temperature the boiler is working at maximum power in HEATING MODE Fig 51 Maximum power in heating mode BO 0000230 2 3 Turn the knob another notch to the right When the letter H appears on the disp...

Page 46: ...ations in the percentage of H2 the percentage of O2 may vary over time For example 20 of H2 in the gas may lead to a 1 5 increase of O2 in the flue gases The gas valve may need to be adjusted more acc...

Page 47: ...EL 24 Combi C 28 Combi C 2 PD LPXP 8 8 to 9 4 Important Remove the Allen key to stabilise the CO2 value if adjustment is required Adjust the setting screw V located on the gas valve Turn the screw clo...

Page 48: ...Fig 54 Combustion procedure 7 Commissioning 48 Combi 2...

Page 49: ...e with I S 813 An example of this is given in I S 813 Domestic Gas Installations This is in addition to the Bench mark Commissioning Checklist 5 Set the central heating and hot water temperatures to t...

Page 50: ...g the menu BO 0000230 14 F1 F1 F2 F1 Fig 57 Scrolling through the menus and or settings BO 0000230 4 8 1 2 Running the automatic detection function After removing or replacing a PCB accessory board no...

Page 51: ...emperature or open a domestic water tap 8 2 2 Changing the heating flow temperature 1 Use the knob to adjust the flow temperature in heating mode Turn the knob anti clockwise to reduce the temperature...

Page 52: ...menu and enter the password Turn the knob until DEAIR is displayed Press the F4 knob and AIR appears on the display Press the F4 knob again to activate the function 8 5 Frost protection It is a good...

Page 53: ...PERATURE Important The factory settings for certain settings may differ based on the market the product is destined for Fig 62 Step 2 BO 0000230 14 F2 F1 F1 F1 BO 0000230 9 9 2 List of parameters Tab...

Page 54: ...temperature C below that at which anti frost protection is activated 10 30 25 Installer AP082 Not used 0 Installer AP091 Type of outdoor sensor used 0 Auto 1 Wired sensor 2 Wireless sensor 3 Internet...

Page 55: ...tic Hot Water sensor 1 DHW Domestic Hot Water thermostat 1 Installer DP160 Temperature setpoint of the anti legionella function C 65 60 90 Installer DP200 DHW mode 0 Domestic hot water programming onl...

Page 56: ...perature C set by EVENING activity in the zone 22 5 30 User CP085 Temperature C set by CUSTOM activity in the zone 20 5 30 User CP200 Required ambient temperature C for the zone in manual mode 20 5 30...

Page 57: ...t the curve change the following settings CP000 Heating flow maximum temperature set point CP200 room temperature setpoint for zones 5 0 to 30 CP210 comfort mode climatic curve offset from 15 to 90 wi...

Page 58: ...settings Press the F1 key to exit Setting read only Description Value AM001 DHW Domestic Hot Water mode enabled 0 Disabled 1 Enabled 0 1 AM010 Pump speed 0 100 AM011 Service required 0 Disabled 1 Ena...

Page 59: ...ected 0 Not detected 1 Detected 0 1 GM004 Gas valve 0 Open 1 Closed 2 Off 0 1 2 GM007 Start up 0 Off 1 On 0 1 GM008 Actual flame current measured A GM012 Contact release signal X16 0 No 1 Yes 0 1 GM01...

Page 60: ...List of sub statuses SUB STATUS Standby 0 Wait time until next ignition in heating mode 1 Pre ventilation 13 Burner ignition signal sent to safety core 15 Burner pre ignition 17 Burner ignition 18 Fl...

Page 61: ...after last maintenance operation AC005 User Indicative energy consumption kW h in heating mode AC006 User Indicative energy consumption kW h in domestic hot water DHW mode AC026 Installer Number of p...

Page 62: ...g must be checked The integrity of the complete flue system and the flue seals by checking air inlet sample to eliminate the possibility of recirculation O2 20 6 CO2 0 2 The integrity of the boiler co...

Page 63: ...he AP009 parameter BO 7763705 7 10 2 1 Service notification When the boiler needs to be serviced a request message appears on the display Use the automatic assistance notification for preventative mai...

Page 64: ...an upcoming maintenance message once the intermediate maintenance service has been carried out 1 Navigate to the Counter menu 2 Press the F4 key to open the menu 3 Turn the knob until the code SVC is...

Page 65: ...tended for use with this type of boiler Important When performing any inspection or maintenance personal protec tive equipment must be used where appropriate 1 Ensure that both the gas and electrical...

Page 66: ...3 Remove the siphon 4 and clean it Replace if necessary all the gaskets present Fill the siphon with water and reposition it in its seat 5 BO 0000208 Fig 72 Dismantling the siphon A 2 4 1 5 10 3 2 Che...

Page 67: ...particles Do not aim the water jet directly at the insulating surface on the rear of the heat exchanger To re assemble perform the above actions in reverse order Caution The maximum tightening torque...

Page 68: ...or grease as a lubricant but only Molykote 111 Caution Do not use tools to remove components from inside the water unit e g filter For certain user areas where domestic water hardness values exceed 2...

Page 69: ...cock E Close the domestic water inlet cock Empty the water from the domestic water circuit by opening a user cock Remove the exchanger by unscrewing the two screws A Clean the plate heat exchanger wi...

Page 70: ...Electrode worn 3 Distances out of range chapter Electrode distance To remove the electrode Disconnect the power supply to the boiler Cut off the gas supply to the boiler Remove the front panel on the...

Page 71: ...rry out the replacement Press the two external buttons on the control panel simultaneously for about 40 seconds Caution Please note that resetting the CN1 and CN2 settings with data on the data plate...

Page 72: ...ntact our authorised technical assistance centre E Stoppage reset required 11 2 Error codes 11 Troubleshooting 72 Combi 2 Tab 32 List of temporary faults DISPLAY DESCRIPTION OF TEMPORARY FAULTS CAUSE...

Page 73: ...PCB ty pe Contact the Service Network H 02 07 Low pressure in heating circuit water filling required Check the installation pressure and restore Check the expansion vessel pressure Check for boiler i...

Page 74: ...s detected five times in 24 hours GAS SUPPLY Check the gas supply pressure Check the gas valve calibration ELECTRODE PROBLEM Check the electrode connection and wiring Check the condition of the electr...

Page 75: ...e conditions E 04 13 Fan blade blocked or maximum rpm exceeded FAN PCB PROBLEM Check the PCB fan connection Check the fan operation E 04 17 Fault in gas valve control circuit MAIN PCB ERROR Check the...

Page 76: ...ces A 02 49 Failed node initialisation ELECTRICAL CONNECTION ERROR Start the auto detect function parameter AD Check electrical connections of external devices A 02 54 Open Therm bus power supply erro...

Page 77: ...llation Warning If the boiler was in operation wait for the water contained in the heating installation to cool down 7 Remove the pipe connecting the boiler to the chimney and close the connection wit...

Page 78: ...ans that the boiler must be disposed of correctly by contacting staff at the nominated disposal facility or by taking it to a centre that is authorised to dispose of bulky waste domestic appliances Wa...

Page 79: ...rs recommendations at least annually This must be carried out by a competent Gas Safe registered engineer The service details should be recorded on the Benchmark Service and Interim Boiler Work Record...

Page 80: ...no what is the maximum central heating output selected kW Dynamic gas inlet pressure mbar C Central heating return temperature C System correctly balanced rebalanced Yes COMBINATION BOILERS ONLY Is th...

Page 81: ...er name Company name Telephone No Gas Safe registration No Max rate CO ppm CO CO CO Min rate CO ppm CO CO CO undertaken in accordance with manufacturers instructions and readings are correct yes Gas r...

Page 82: ...er name Company name Telephone No Gas Safe registration No Max rate CO ppm CO CO CO Min rate CO ppm CO CO CO undertaken in accordance with manufacturers instructions and readings are correct yes Gas r...

Page 83: ...hnological information contained in these technical instructions as well as any drawings and technical descriptions supplied remain our property and shall not be multiplied without our prior consent i...

Page 84: ...ons visit www baxi co uk terms Failure to adhere to terms and conditions will void your manufacturer s warranty Baxi Brooks House Coventry Road Warwick CV34 4LL Please ensure the boiler is installed i...

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