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Baxi Combi Instant 80 HE and 105 HE Quick Start Manual

1. Frost Thermostat N External Clock Room Thermostat Earth green yellow IMPORTANT If an integral timer is fitted to the boiler an external frost thermostat wired as shown will not operate correctly Only external timers may be used in such installations as in the diagram 230V bk 4 tw bk Beer DENS Terminal Block Fig 29 Functional Flow Diagram External L Controls 230 V 4 ipr Selector Reset Switch bk Key to Wiring b blue br brown bk black r red g green Fig 30 PCB Flue Thermostat Safety Overheat Thermostat Rb Central Heating 4 NTC Sensor 7 s DHW B g NTC Sensor Gas Valve Modulator Spark Electrode Gas Valve Condensate Trap I Flame Sensing Electrode r CI Hydraulic Differential Pressure Switch 41 1 9 DHW Flow Priority Microswitch 9 8 0 Installation Making The Electrical Connections To connect the mains input cable proceed as follows Slacken the facia panel securing screws and lift the outercase panel so that its securing tabs are clear of the facia Remove the panel 2 Completely undo the screws securing the facia panel and hinge it down Fig 26 3 Remove the control box cover securing screws Disengage the barbs on the control box from the cove
2. IMPORTANT Check all dimensions before cutting 23 24 Fig 25 Flue Trim 8 0 Installation Fitting the Flue Cont 5 Mark dimension Y on the flue as shown Fig 23 Carefully cut the waste material from the flue ensuring that the ducts are square and free from burrs 6 The inner flue duct support bracket may be in the waste portion of the flue In this case retrieve the bracket before discarding the waste 7 Take the inner flue support bracket if not already fitted and engage it over the flue duct This will centralise the flue and air ducts and ease assembly Fig 24 8 Insert the flue through the hole in the wall Fit the elbow to the boiler adaptor ensuring that it is pushed fully in 9 Draw the flue back through the wall and engage it in the elbow It may be necessary to use soap solution or similar to ease assembly of the elbow adaptor and flue Fig 25 10 Make good between the wall and air duct outside the building Fit the flue trim if required and if necessary fit a terminal guard see Section 7 9 amp 7 10 VERTICAL FLUE Only a flue approved with the Baxi Combi 105 HE can be used 2 For information on vertical flues consult the Baxi Flue Guide brochure Control Box Cover Fig 27 Cable Clamp Fuse x Always fit fast blow 2A fuse Fused supply 3A 230V 50Hz Live brown Neutral blue
3. YES Go to next page 44 14 0 Fault Finding Central Heating Follow operational sequence Continued Continued from previous page Does the burner remain lit CH temperature higher than set point of CH thermostat control When CH temperature decreases cycle continues Turn the selector to reset If regular resetting is required or appliance still does not Go to section J amp O operate investigation is necessary Fan runs at max speed neon flashing YES NO R E neons flashing NO neon flashing Go to section D Air pressure switch proved e Goto section Turn selector to the reset YES YES position If the neon does not extinguish go to sections H and Spark at ignition electrodes for NO flashing i YES NO A neon illuminated Go to section F XES Burner extinguishes after 10 neon flashing seconds Go to section I amp N NO Burner output modulates until Gode sectam d set temperature is reached YES Pump continues to run for Operation sequence L Fan stops 3 minutes room thermostat open SOC YES 45 Fault Finding Solutions A Is there 230V at Main terminals L and N js NO 3 Selector terminals a amp b and a amp 3 PCB A4 connector terminals 4 amp 5 B Is there 230V at l If pump jammed release PCB A4 connector terminals
4. TES Change pump supply cable NO NO CH system pressure 0 5 to 1 5 bar a NO Check automatic air vent is open NO D Continuity across flow microswitch and PCB A5 connector terminals 7 amp 8 2 Temperature sensor faulty Cold resistance approx Primary flow valve diaphragm damaged YIES resistance reduces with increase in temp Fan connections correct at fan PCB A2 connector 230V across terminals 5 amp 7 46 14 0 Fault Finding Check electrical supply Replace fuse Check wiring Replace selector Q neon illuminated Replace main PCB Replace pump Replace main PCB Re pressurise system Open the automatic air vent Replace diaphragm Flow valve rod obstructed clean reset Replace microswitch Replace sensor YES Fan jammed or faulty winding Replace fan Replace main PCB Fault Finding Solutions E Check and correct if necessary Electrical and pressure tube connections 2 Blockage of pressure tubes 3 Restriction in flue 4 Venturi F sene N Check the burner setting pressure see Technical Data and Commissioning Voltage at modulating coil of gas valve is Max burner press approx 9V DC 13V DC LPG Min burner press approx DC Current at modulating coil of gas valve is Use an instrument with average function for this measure 30 230 mA DC 45 310 mA DC LPG
5. 50H fused at 3A NOTE The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance Connection may be via a fused double pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only m 7 0 Site Requirement Termination to an internal soil and vent pipe Condensate Drain FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER 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 The condensate outlet terminates in BSP nut and seal AAA 450mm min for the connection of 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 2 Ensure the discharge of condensate complies with any External termination via internal discharge national or local regulations in force Boiler branch BS 6798 2000 amp Part HI of the Building Regulations give e g sink waste downstream further guidance 3 The discharge pipe should be run in a proprietary drain pipe Pipe must terminate material e g PVC PVC U ABS PVC C or PP Sink above water level but below surrounding 4 Metal pipework is N
6. 2mbar 2 mbar Propane 21 8mbar 32 3mbar If not check that the gas supply pressure is correct Natural Gas 20mbar and Propane 37mbar 9 The pressure can be adjusted if required 10 To check and set minimum pressure first remove one of the modulator wires Adjusting the Pressure Fig 35 Remove the plastic protection cap from the pressure adjustment nuts on the valve 2 The smaller nut bmm adjusts minimum pressure and the larger nut 8mm maximum pressure 3 Using a suitable spanner adjust the relevant nut until the correct pressure is achieved 4 Once the pressure has been set turn the boiler off and disconnect the pressure gauge 5 Tighten the pressure test screw and refit the modulator to the valve Reassemble in reverse order 27 28 Facia Panel Front Panel CA Fig 38 10 0 Completion Completion Hinge the facia panel upwards and refit the case front panel Tighten the securing screws Fig 38 2 Instruct the user in the operation of the boiler and system explaining the operational sequence 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 These details will be required in the event of any warranty work The publication must be handed to the user for safe keeping and each subsequent regular service visit
7. 60ml R 2 5bar 5 If the hot water expansion is not provided for then high pressures can develop which may result in damage o fittings and devices on the system 5 The boiler s maximum working mains pressure is 8 bar therefore all pipework connections fittings etc should be suitable for pressures in excess of 8 bar A pressure reducing valve must be fitted for pressures in excess of 8 bar The manufacturer of any 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 69 Showers If a shower control is supplied from the appliance it should be of the thermostatic or pressure balanced type Thermostatic type shower valves provide the best comfort and guard against water at too high a temperature Existing controls may not be suitable refer to the shower valve manufacturer 16 10 Water Areas Ifthe 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 5mm Min 450mm gt gt Fig 9 E Min For to Purposes 5mm LN In ot be Fig 10 20mm 5mm Min see NOTE gt 200mm Min 780mm Y 200mm Min 7 0 Site Requirements Location The boiler
8. COMBINATION BOILERS ONLY HAS A WATER SCALE REDUCER BEEN FITTED YES NO _ WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED FOR THE DOMESTIC HOT WATER MODE MEASURE amp RECORD GAS RATE m lhr ft8 hr MAXIMUM BURNER OPERATING PRESSURE IF APPLICABLE N A mbar COLD WATER INLET TEMPERATURE HOT WATER OUTLET TEMPERATURE WATER FLOW Its min FOR CONDENSING BOILERS ONLY CONFIRM THE FOLLOWING THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH THE MANUFACTURER S INSTRUCTIONS YES FOR ALL INSTALLATIONS CONFIRM THE FOLLOWING THE HEATING AND HOT WATER SYSTEM COMPLIES WITH CURRENT BUILDING REGULATIONS THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMMISSIONED IN ACCORDANCE WITH THE MANUFACTURER S INSTRUCTIONS IF REQUIRED BY THE MANUFACTURER HAVE YOU RECORDED A CO CO RATIO READING YES CO CO2 RATIO THE OPERATION OF THE APPLIANCE AND SYSTEM CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER THE MANUFACTURER S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER COMMISSIONING ENG S NAME PRINT CORGI ID No 50 SIGN DATE 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 manufa
9. Central Heating only Above Casing 200 mm Min ntegral with appliance Burner Pressure Natural Gas G20 Below Casing 200 mm Min bar Max Rate Min Rate Front 450 mm Min For Servicing in Pre charge Pressure 0 5 mbar 102 0 5 2102 Front 5 mm Min In Operation LH Side 5 mm Min litre Inlet Pressure Natural Gas G20 R H Side 5 mm Min In Operation ax Capacity of mbar 20 20 mm Min See Note CH System 80 3 Pr Burner Injector Natural Gas G20 NOTE The boiler can be operated with a nmay Water Content 3 0 clearance of 5mm at the right This is also sufficient of Boiler unpressurised 15 x 18mm Diameter Electrical Supply 230V 50H Appliance must be connected to an earthed supply for routine maintenance However a clearance of 20mm is required if it is necessary to remove the secondary heat exchanger This should be considered when siting the appliance and in the event of any subsequent alterations in the area of Temperatures Flow Temp adjustable 35 C to 85 C max 5 C External Fuse Rating 3A installation D H W Flow Temp 35 C to 65 C max 5 C Weights kg dependent upon flow rate Internal Fuse Rating Packaged Boiler Carton 56 50 C Pre heat OFF Fuse 2A Fast Blow to BS 4265 Installation Lift Weight 44 65 C Pre heat ON 5 C dependent upon flow rate SEDBUK Declaration For Combi Instant 80 HE Pump Available Head The seasonal efficiency SEDB
10. Spigot Outlet Pipe 80 HE 9 Fit the new fan to the hood using the screws and spring washers previously removed 10 Reassemble in reverse order of dismantling Baffle Tab Spring Clip e Pressure Switch Fig 47 Remove the fan as described in section 12 1 2 Note the positions of the two sensing tubes and three wires and remove them 3 Remove the two screws holding the pressure switch to the bracket on the combustion box top panel 4 Fit the new pressure switch and reassemble all components in reverse order of dismantling d Pi v d Spring Washer pring d Securing Screw 3l Pipe Connecting Clips Heat Exchanger Return Pipe Flow Pipe Fig 50 Heat Exchanger 5 Electrodes y fi Electrode lt 7 Fig 51 Electrode Leads 32 12 0 Changing Components Heat Exchanger Fig 50 Remove the fan as described in section 12 1 2 Drain the primary circuit Prise the three pipe connecting clips off the joints in the flow and return pipes Remove the heat exchanger return pipe 3 Lift the heat exchanger to disconnect the flow pipe joint Withdraw it from the appliance taking care not to damage the rear insulation piece 4 Fit the new heat exchanger 5 Reassemble in reverse order of dismantling and repressurise the system Burner Fig 51 Remove the four
11. both the gas and electrical supplies to the boiler are isolated before any work is started Pressure Switch When the new component has been fitted turn the selector switch fully anticlockwise against the spring pressure to position R and hold for 2 seconds to reset the boiler before recommissioning See Section 11 1 Annual Servicing for removal of case panel door etc 12 1 Fan Figs 48 amp 49 br Note the positions of the two sensing tubes on the Pressure fan spigot 105 model Only one tube on 80 model and Switch Wires three wires on the fan motor and remove them 2 Slacken the screws on the fan spigot outlet pipe clamps Ease the clamps inwards over the pipe 105 Fan Wires 5 Fan 3 On 80 models undo the securing screw at the left hand end of the pipe 4 Draw the outlet pipe away from the boiler UUA N L 5 Remove the four screws securing the combustion box door and remove the door Sensing Tube 6 Ease the front edge of the left hand baffle upwards disengaging the spring clip Disengage the tab on the baffle from the slot in the fan hood Ease Fan Spigot Outlet Instant 105 HE Pipe Clamps Inwards model shown m di 7 7 Undo the screws securing the fan hood the 2 Fig 48 appliance back panel and draw the fan and hood assembly forwards 8 Remove the screws and spring washers securing the fan to the hood 105 HE Fan
12. fins are clear of any obstruction NOTE If necessary the secondary heat exchanger may be dismantled see section 12 24 DHW Filters Fig 46 18 If the flow of domestic hot water is diminished it may be necessary to clean the filters 19 Initially check the cold water inlet tap filter 20 Turn the tap off Undo the blanking cap and remove the threaded bush Fig 45 e ig Fig 45 21 Extract the filter and rinse thoroughly in clean water Wiad d Reassemble and check the flow If required clean the manifold filter as described below 22 Undo the filter cartridge from the inlet return manifold 23 Dismantle the cartridge and carefully remove the flow regulator and filter gauze Rinse them thoroughly in clean water and reassemble in reverse order 24 Check that the pressure vessel charge is 0 5bar and i Y reassemble in reverse order of dismantling Blanking Cold Water Cap Inlet Tap 25 Turn the selector switch fully anticlockwise against the spring pressure to position R and hold for 2 seconds to reset the boiler before recommissioning Cartridge Body 26 Complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication and then hand it back to the user Filter Gauze Flow em Regulator a M Venturi 30 Fig 46 Inlet Return Manifold 12 0 Changing Components IMPORTANT When changing components ensure that
13. 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 The boiler may be fitted inside a cupboard see Section 7 3 2 If the boiler is sited in an unheated enclosure then it is recommended to leave the ON OFF Selector Switch in the domestic hot water and central heating position to give frost protection 3 If the boiler is fitted in a room containing a bath or shower reference must be made to the relevant requirements n GB this is the current I E E Wiring Regulations and Building Regulations n IE reference should be made to the current edition of 5 813 Domestic Gas Installations and the current ETCI rules 4 fthe boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engineers Publication GE UP 7 Gas Installations in imber Framed Housing Clearances Figs 9 amp 10 A flat vertical area is required for the installation of the boiler 2 These dimensions include the necessary clearances around the boiler for case removal spanner access and air movement Additional clearances may be required for the passage of
14. screws securing the combustion box door and remove the door 2 Undo the screws securing the burner to the injector manifold Draw the burner out of the combustion box pulling the electrode grommets from the slots in the combustion box lower panel 3 Disconnect the electrode leads and grommets from he electrodes Completely remove the 4 Undo the screws securing the electrodes to the burner Examine the condition of the electrodes replacing if necessary Fit the electrodes to the new 5 Engage the burner location brackets over the studs on he injector manifold and reassemble in reverse order 12 0 Changing Components Injectors Fig 52 Remove the burner as described in Section 2 4 Injector Manifold Inlet Elbow 2 Undo the screws securing the injector manifold to Gasket the inlet elbow and remove the manifold 3 Unscrew and replace injectors as required and examine the sealing gasket replacing as necessary Reassemble in reverse order Electrodes Fig 52 Electrodes Remove the four screws securing the combustion box door and remove the door Electrode Grommets 2 Undo the screws securing the burner to the injector manifold Draw the burner out of the combustion box pulling the electrode grommets from the slots in the Leads combustion box lower panel 3 Disconnect the lead and grommet from the elect
15. the temperature of the central heating water Central Heating Mode 28 11 16 15 Primary Heat Exchanger Automatic Air Vent Plate Heat Exchanger 9 Flow Sensor with Filter 10 Pressure Relief Valve I1 Boiler Drain Point 12 Heating Return 13 Cold Water Inlet On Off Valve and Filter 14 Gas Inlet 2 Burner 3 lgnition Electrode 4 Flame Sensing Electrode 5 Gas Valve 6 Pump 7 8 Domestic Hot Water Preheat Mode 14 3 12 Domestic Hot Water Outlet Heating Flow Pressure Gauge ydraulic Pressure Sensor Microswitch Automatic By Pass ydraulic Pressure Sensor Diverter Valve Assembly Domestic Hot Water Flow Priority Assembly Domestic Hot Water Flow Priority Microswitch Safety Thermostat Central Heating Temperature Sensor Expansion Vessel amp Pre Heat Store Domestic Hot Water Temperature Sensor Secondary Heat Exchanger 28 2 3 4 27 3 0 Appliance Operation NOTE All delay timers mentioned in 3 1 and 3 3 are overridden by domestic hot water demand Central Heating Mode Fig 2 W
16. 385 A Flue Overheat Thermostat 5112395 7 2 7777 2 7 lt lt Ly ST I II I IIIT Wii ii ii L My KZ j j i QUT lt 7 id 7 m CP 32 387 49 BENCHMARK No 5111111181017 henchman J GAS BOILER COMMISSIONING CHECKLIST BOILER SERIAL No NOTIFICATION No CONTROLS To comply with the Building Regulations each section must have a tick in one or other of the boxes TIME amp TEMPERATURE CONTROL TO HEATING ROOM T STAT amp PROGRAMMER TIMER PROGRAMMABLE ROOMSTAT TIME amp TEMPERATURE CONTROL TO HOT WATER CYLINDER T STAT amp PROGRAMMER TIMER COMBI BOILER HEATING ZONE VALVES FITTED NOT REQUIRED HOT WATER ZONE VALVES FITTED NOT REQUIRED THERMOSTATIC RADIATOR VALVES FITTED AUTOMATIC BYPASS TO SYSTEM FITTED NOT REQUIRED FOR ALL BOILERS CONFIRM THE FOLLOWING THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACTURER S INSTRUCTIONS THE SYSTEM CLEANER USED THE INHIBITOR USED FOR THE CENTRAL HEATING MODE MEASURE amp RECORD GAS RATE m lhr BURNER OPERATING PRESSURE IF APPLICABLE N A mbar CENTRAL HEATING FLOW TEMPERATURE aC CENTRAL HEATING RETURN TEMPERATURE FOR
17. 612 2 Comp 5111807 Iss 2 03 05
18. BAXI Installation amp Servicing Instructions Baxi Combi Instant 80 HE Baxi Combi Instant 105 HE Gas Fired Wall Mounted Condensing Combination Boiler Please leave these instructions with the user Baxi Combi Instant 80 HE G C N 47 075 17 Section Page Baxi Combi Instant 105 HE Legislation 4 47 075 19 1 0 Introduction 5 2 0 General Layout 6 3 0 Appliance Operation 7 4 0 Technical Data 9 5 0 Dimensions and Fixings Building Regulations the Benchmark Commissioning Checklist 6 0 System Details 12 Building Regulations England amp Wales require notification of 7 0 Site Requirements 15 the installation of a heating appliance to the relevant Local Authority Building Control Department From April 2005 this 8 0 Installation 21 be achieved via a Competent Persons Self Certification Scheme as an option to notifying the Local Authority directly 9 0 Commissioning the Boiler 26 Similar arrangements will follow for Scotland and will apply in Northern Ireland from January 2006 10 0 Completion 28 CORGI operate a Self Certification Scheme for gas heating 11 0 Servicing the Boiler 29 appliances 12 0 Changing Components 3l These arrangements represent a change from the situation whereby compliance with Building Regulations was accepted as 13 0 Illustrated Wiring Diagram 41 being demonstrated by completion of the Benchmark Logbook which was then left on s
19. C 2 JD 8 Slacken the screws on the fan spigot outlet pipe clamps Ease the clamps inwards over the pipe 105 9 On 80 models undo the securing screw at the left Sensing Tubes hand end of the pipe Ease Fan Spigot 10 Draw the outlet pipe away from the boiler Pipe Clamps Inwards Remove the four screws securing the combustion box door and remove the door Fig 40 105 HE Fig 41 Combustion Box Door Instant 105 HEN Fig 40 model shown lt Inner Door Panel 29 _Tab Spring Clip 11 0 Servicing the Boiler Annual Servicing Cont Ease the front edge of the left hand baffle upwards disengaging the spring clip Disengage the tab on the baffle from the slot in the fan hood Fig 42 12 Undo the screws securing the fan and hood to the appliance back panel Draw the assembly forwards Fig 43 13 Undo the screws securing the burner to the injector manifold Draw the burner out of the combustion box pulling the electrode grommets from the slots in the combustion box lower panel Fig 44 Fan and Hood Assembly 4 Disconnect the electrode leads and grommets from the electrodes Completely remove the burner Fig 44 5 Brush any deposits from the injectors Do not use a pin or wire to clean them 6 Brush the burner blades and venturis and clean the combustion box 7 Ensure that the heat exchanger
20. Ensure controls are set to demand and verify the contacts are closed Turn Central Heating External controls calling for thermostat to maximum heat and where fitted internal QQ illuminated clock calling for heat neon flashing Go to section B Primary water is diverted from preheating circuit to CH system QQ neon illuminated Go to section M neon flashing Go to section B Pump runs YER Turn the selector to reset flashin If regular resetting is required itch operated neon E Go to section C or appliance still does not Go to section J amp O operate investigation is Fan runs at max speed amp neon flashing necessary YES NO B A R W neons flashing m d NO flashing Go to section D urn selector to the rese YES YES position If the neon does not extinguish go to sections H and NO gt Change main PCB Spark at ignition electrodes for NO up to 10 seconds neon flashing NO YES Burner extinguishes after 10 neon flashing seconds Go to section I amp N Preheating function starts after 25 seconds Preheat control is not at f neon flashing minimum position External Go to section L see DHW preheating control calling for heat function YES Primary water is diverted from NO reheating circuit to CH brum Go to section M QJ neon illuminated
21. OT suitable for use in condensate surface discharge systems 5 The pipe should be a minimum of 2 1 5mm diameter and must be supported using suitably spaced clips to prevent sagging 6 Any pipe fitted externally must not exceed 3 metres Mr 7 Any condensate discharge pipework external to the External termination to a drain or gully building or in an unheated part of it e g garage must be insulated to protect against frost It is also recommended Pipe must terminate above that the pipe diameter is increased to 32mm water level but below surrounding surface 8 If the boiler is fitted in an unheated location the entire condensate discharge pipe should be treated as an external run 9 In all cases discharge pipe must be installed to aid disposal of the condensate To reduce the risk of condensate being trapped as few bends and fittings as possible should be used 10 When discharging condensate into a soil stack or waste pipe the effects of existing plumbing must be considered If soil pipes or waste pipes are subjected to internal pressure fluctuations when WC s are flushed or sinks emptied then External termination to a purpose made soak away back pressure may force water out of the boiler trap and cause Boiler appliance lockout lt 500mm min Examples are shown of the following methods of termination i to an internal soil amp vent pipe il via an internal discharge branch e g sink waste iii to a drai
22. UK is 87 3 89 3 LPG vC NM Band B This value is used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings The test data from which it has been calculated have been certified by 0051 LPG Propane G31 Metre wg Burner Injector 15 x 0 77mm diameter Burner Pressure Propane Max Rate Min Rate mbar 21 8 44 02 Inlet Pressures 0 200 400 600 800 1000 1200 mbar Flow Rate I h 4 0 Technical Data Combi Instant 105 HE Appliance Type Ci C3 Power Consumption 180W Central Heating Primary Circuit Appliance Category CAT Il 2H 3P Electrical Protection IPX5D TT Heat Input CH Safety Discharge 3 NO Class 3 Max Operating 2 5 Max B ___ _ Min Operating 0 5 kW 30 5 11 9 Condensate Drain BSP Recommend Operating 1 2 Heat Output CH Non Condensing Flue Terminal Diameter 100mm DHW Circuit bar Max in Dimensions Projection 125mm Pressures kW 29 6 ax Operating 8 in Operating 0 2 Heat Output CH Condensing Connections copper tal Max in Gas Supply mm in Operating Pressure Central Heating Flow 22mm at 1323 096 kw 3 11 3 Central Heating Return 22mm Cold Water Mains Inlet 5mm Flow Rates l min DHW Flow I5mm DHW F
23. Weights kg dependent upon flow rate Internal Fuse Rating Packaged Boiler Carton 57 5 50 C Pre heat OFF Fuse 2A Fast Blow to BS 4265 Installation Lift Weight 47 65 C Pre heat ON 5 C dependent upon flow rate SEDBUK Declaration For Combi Instant 105 HE Pump Available Head The seasonal efficiency SEDBUK is 87 3 89 4 LPG Band B This value is used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings The test data from which it has been calculated have been certified by 0051 LPG Propane G31 Metre wg Burner Injector 15 x 0 77mm diameter Burner Pressure Max Rate Min Rate Propane mbar 323 52 02 Inlet Pressures 0 200 400 600 800 1000 1200 mbar Flow Rate l h 5 0 Dimensions and Fixings Dimensions Tube 100mm Tap Rail 4 t 4 l l 28mm E Condensate Drain 65 I 65 mm 65 mm 65 mm 65 mm I Ee p Md I Heating Domestic Hot Gas Cold W ater H eating Pressure Relief Flow W ater O utlet Inlet Inlet Return Valve 22mm 15mm 22mm 15mm 22mm 15mm Ju 60 ta m 6 0 System Details Information The Baxi Combi Instant 80 HE and 105 HE Condensing Combination Boilers are Water Byelaws Scheme Approved Products To comply with the Water Byelaws your attention is drawn to the followi
24. agm Figs 68 amp 69 Turn off the mains water inlet tap and drain the domestic hot water by turning on a hot tap 2 Prise off the spring clip retaining the microswitch Pull the switch away 3 Undo the sensing pipe nut from the valve and slacken the nut at the inlet manifold Ease the pipe away from the valve 4 Undo the screws securing the differential valve cover 5 Carefully draw off the cover and remove the diaphragm noting the orientation 6 Fit the new diaphragm and reassemble in reverse order Diverter Valve Operating Head 3 pin Plug Spring Clip Diverter Valve Diaphragm Spring Spring Clip Pushrod CH Pressure Differential Valve Cover Microswitch Cartridge Body Filter Gauze Flow ae Regulator E M Venturi Fig 71 Inlet Return Manifold 12 0 Changing Components PYY Diverter Valve Assembly Cont CH Pressure Differential Valve Diaphragm Fig 70 Isolate the boiler from the central heating flow and return pipes and drain the boiler primary circuit 2 Prise off the spring clip retaining the microswitch Pull the switch away 3 Undo the screws securing the differential valve cover 4 Carefully draw off the cover and remove the diaphragm 5 Fit the new diaphragm and reassemble in reverse order Diverter Valve Operating Head Fig 70 Pull the 3 pin plug off the operating head an
25. all external controls are calling for heat and check all external and internal fuses Before any servicing or replacement of parts ensure the gas and electrical supplies are isolated Refer to Section 13 0 Illustrated Wiring Diagram for position of numbered terminals Domestic Hot Water Preheating Function Follow operational sequence NOTE When instructed to turn the Selector to Turn On Off Reset selector to the reset position turn the Selector Switch fully NO Sar position Go to section A anticlockwise against the spring pressure to Reset position and hold for 2 seconds to reset the YES boiler Turn preheat control to on Q neon illuminated External controls and where Preheating function starts after fitted integral timer calling for 25 seconds heat neon flashing NO Ensure controls are set to YES demand and verify the contacts are closed DEW preheating cct DHW preheating circuit YES 3 neon flashing YES Q3 neon flashing P fl tch ted YES YES neon flashing neon flashing Go to section D Tum selector to reset position If regular resetting is required or appliance still Goto section or O does not operate investigation is necessary YES Air pressure switch proved i Turn selector to the reset A flashi position If the neon does not Ree extinguish go to sections H and K YES Bur
26. and route it to the outside discharge point IMPORTANT Make all soldered joints before connecting to the pressure relief valve 186 Condensate Drain see section 7 6 Connect the condensate drain using the BSP nut and seal supplied Ensure the discharge of condensate complies with any national or local regulations in force see British Gas Guidance Notes for the Installation of Domestic Gas Condensing Boilers 2 The condensate outlet terminates in a BSP nut and seal for the connection of 21 5mm sin 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 Wall Thickness Flue Elbow 22 Wall Thickness Fig 22 8 0 Installation Fitting The Flue HORIZONTAL FLUE The standard flue is suitable for lengths between 100mm minimum and 685mm maximum as measured from the edge of the flue elbow outlet to the joint between the terminal and air duct Fig 20 2 Locate the flue elbow on the adaptor at the top of the boiler Set the elbow to the required orientation Fig 21 NOTE The flue elbow is angled at 93 degrees to ensure a fall back to the boiler 3 Measure the distance from the outside wall face to the elbow This dimension will be known as X Fig 22 4 To dimension X add 50mm This dimension to be known as
27. are connection points on the mains cold water inlet and central heating return isolating taps Fig 6 to which the optional filling loop kit Part No 248221 can be assembled 3 The filling method adopted must be in accordance with all relevant water supply regulations and use approved equipment 4 Your attention is drawn to for GB Guidance G242 and recommendation R24 2 of Water Regulations Guide for IE the current edition of I S 813 Domestic Gas Installations 5 The sealed primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe provided a Listed double check valve or some other no less effective backflow prevention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use 66 Expansion Vessel Central Heating only The appliance expansion vessel is pre charged to 0 5 bar Therefore the minimum cold fill pressure is 0 5 bar The vessel is suitable for correct operation for system capacities up to 80 litres For greater system capacities an additional expansion vessel must be fitted For GB refer to BS 7074 Pt For IE the current edition of 15 813 Domestic Gas Installations Pressure Relief Valve Fig 7 The pressure relief valve is set at 3 bar therefore all pipework fittings etc should be suitable for pressures in excess of 3 bar 2 The pressure relief discharge pipe s
28. axi declare that no substances harmful to health are contained in the appliance or used during appliance manufacture The appliance is suitable only for installation in GB and IE and should be installed in accordance with the rules in force and only used in a suitably ventilated location In GB the installation must be carried out by a CORGI Registered Installer It must be carried out in accordance with the relevant requirements of the Gas Safety Installation amp Use Regulations The appropriate Building Regulations either The Building Regulations The Building Regulations Scotland Building Regulations Northern Ireland The Water Fittings Regulations or Water Byelaws in Scotland The Current I E E Wiring Regulations Where no specific instructions are given reference should be made to the relevant British Standard Code of Practice In IE the installation must be carried out by a competent Person and installed in accordance with the current edition of I S 813 Domestic Gas Installations the current Building Regulations and reference should be made to the current ETCI rules for electrical installation All systems must be thoroughly flushed and treated with inhibitor see section 6 2 Codes of Practice most recent version should be used In GB the following Codes of Practice apply Standard Scope BS 689 Gas Installation BS 5546 Installation of hot water supplies for domestic purpose
29. cturer s instructions Always use the manufacturer s specified spare part when replacing all controls SERVICE 1 DATE SERVICE 2 DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 3 DATE SERVICE 4 DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 5 DATE SERVICE 6 DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 7 DATE SERVICE 8 DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 9 DATE SERVICE 10 DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE 5 BAXI POTTERTON A Trading Division of Baxi Heating UK Ltd Brownedge Road Bamber Bridge Preston Lancashire PR5 6UP After Sales Service 08706 096 096 Technical Enquiries 08706 049 049 Website www baxi co uk A BAXI GR UP company 923
30. d be carried out 2 These should be performed using a suitable meter and include checks for Ground Continuity Resistance to Ground Short Circuit and Polarity 25 Screw Automatic Air Vent Fig 31 Pump 4 Selector Switch Fig 32 PREHEAT OFF 30 40 50 60 70 80 666666 DC ASBORM T WS Pressure Gauge 9 0 Commissioning the Boiler Een Commissioning the Boiler Reference should be made to BS 5449 Section 5 when commissioning the boiler 2 Open the mains water supply to the boiler 3 Open all hot water taps to purge the DHW system 4 Ensure that the filling loop is connected and open then open the heating flow and return valves on the boiler 5 Open the screw on the automatic air vent Fig 31 6 The system must be flushed in accordance with BS 7593 see Section 6 2 and the flushing agent manufacturers instructions 7 Pressurise the system to 1 0 bar then close and disconnect the filling loop 8 Turn the gas supply on and purge according to in GB BS 6891 and in IE I S 813 Domestic Gas Installations 9 Test for gas soundness 10 If at any time during commissioning it is required to terminate a particular cycle e g the pump overrun period turn the selector to the OFF position and then back to either or 1000 Fig 33 Power On 7 Neon Central Heating Hot Water Temperature Control Temperature Cont
31. d prise off the spring clip retaining the head to the valve body 2 Lift the operating head away from the valve body 3 Fit the new head and reassemble in reverse order Flow Regulator Figs 71 amp 72 Undo the filter cartridge from the inlet return manifold 2 Unscrew the venturi and remove the flow regulator 3 Check the cleanliness of the filter gauze rinsing thoroughly in clean water as necessary Fit the new flow regulator and reassemble in reverse order 39 Secondary Heat Exchanger Pipe Connecting Clip Fan Spigot Outlet Pipe Clamp Outer Drum Boiler Return Pipe Heat Exchanger Return Pipe Fan Spigot Outlet Pipe Ease Fan Spigot Outlet Pipe Clamps Inwards Fan Spigot Outlet Pipe Fig 74 Pe a Overheat Thermostat 40 12 0 Changing Components Secondary Heat Exchanger Fig 73 Drain the primary circuit 2 Undo the four screws securing the right hand case panel Remove the panel 3 Prise the connecting clips from the heat exchanger return pipe and the boiler return pipe Remove the pipes 4 Slacken the screws on the left hand fan spigot outlet pipe clamp Ease the clamp to the right 5 Remove the nut securing the elbow to the secondary heat exchanger Draw the elbow and outlet pipe forwards 6 Remove the secondary heat exchanger from the outer drum by easing it forward 7 Reassemble in revers
32. e Flue Exit Wall Plate Filling Loop 8 0 Installation EN Initial Preparation The gas supply gas type and pressure must be checked for suitability before connection see Section 7 4 After considering the site requirements see Section 7 0 position the fixing template on the wall ensuring it is level both horizontally and vertically 2 Mark the position of the two most suitable fixing slots for the wall plate and boiler lower fixing holes It is preferable to use the horizontal fixing slots 3 Mark the position of the centre of the flue hole rear exit For side flue exit mark as shown Fig 16 4 Note the shaded area on the template Pipework cannot be routed upwards behind the boiler 5 If required mark the position of the gas and water pipes Remove the template 6 Cut the hole for the flue minimum diameter 16mm 7 Drill the wall as previously marked to accept the wall plugs supplied Secure the wall plate using the fixing screws 8 Using a spirit level ensure that the plate is level before finally tightening the screws 9 Connect the gas and water pipes to the valves on the wall plate using the copper tails supplied Ensure that the sealing washers are fitted between the connections Flushing Connect a tube to the central heating flow or return pipe Fig 17 2 Flush thoroughly see System Details Section 6 2 3 The use of the optional Baxi F
33. e order of dismantling Flue Overheat Thermostat Fig 74 NOTE The flue overheat thermostat includes a reset button Check that the thermostat will not reset before replacing Remove the fan spigot outlet pipe from the fan and elbow 2 Pull the two wires off the terminals on the flue overheat thermostat Unscrew the thermostat from the adaptor in the outlet elbow 3 Reassemble in reverse order of dismantling 13 0 Illustrated Wiring Diagram Air Pressure Switch Central Heating Temperature Sensor Domestic Hot Water Temperature Sensor Optional WN Control PCB Flame Z Sensing Sa BA Electrode Diverter Valve Operating Head c RON au t Condensate Trap br brown bk black b blue r red g green g y green yellow w white 41 14 0 Fault Finding Carry out initial fault finding checks Check that gas water and electrical supplies are available at the boiler Electrical supply 230V 50 Hz CH water system pressurised 0 5 bar when the boiler is cold The preferred minimum gas pressure is 9 5mbar natural gas or 36mbar propane Carry out electrical system checks i e Ground Continuity Resistance to Ground Short Circuit and Polarity with a suitable meter NOTE These checks must be repeated after any servicing or fault finding Ensure
34. e valve Undo the screw securing the spark generator electrical plug to the valve and disconnect the plug 4 Pull the earth wire off the spade terminal on the valve 5 Remove the screws securing the inlet pipe flange to the boiler bottom panel and those securing the outlet manifold to the burner manifold 6 Remove the valve from the boiler 7 Note the orientation of the inlet pipe and outlet manifold Undo the securing screws and remove the pipe and manifold 8 Examine the O ring seals for damage replacing as necessary 9 Fit the inlet pipe and outlet manifold to the new valve ensuring that the O ring seals are in place 10 Reassemble in reverse order and check the burner pressure Section 9 2 Central Heating Temperature Sensor Fig 55 Ease the retaining tab on the sensor away and disconnect the electrical plug 2 Unscrew the sensor from it s pocket and reassemble in reverse order The electrical plug will only fit one way PALE Safety Thermostat Fig 55 Pull the electrical connections off the thermostat 2 Remove the screws securing the thermostat to the mounting plate on the flow pipe 3 Reassemble in reverse order The thermostat is not polarised either wire can fit either terminal on the thermostat PAIE DHW Temperature Sensor Fig 56 Turn off the mains water supply and draw off the residual domestic hot water 2 Ease the retaining tab on the senso
35. erature This is indicated by the domestic hot water mode neon flashing Optional Extras Various flue extensions bends vertical flue kits control accessories etc are available as optional extras These are detailed in a separate publication 21 24 25 26 27 28 29 30 40 50 60 70 80 22 PREHEAT 4 23 2 0 General Layout Layout VP o eS we SS p w w w M YN NY NY NY KN Soe Soe COGO See EE 0 us eS 33 o0 no U FW DN Air Pressure Switch Expansion Vessel amp Pre Heat Store Burner Manifold Automatic Air Vent DHW Plate Heat Exchanger Circulation Pump Drain Off Point Pressure Relief Valve Position for Optional Integral Timer Central Heating System Pressure Gauge PCB Control Box 3 Way Valve Assembly Condensate Trap Flame Sensing Electrode Spark Electrode Burner Primary Heat Exchanger Fan Assembly Secondary Heat Exchanger On Off Reset Selector Switch Central Heating Temperature Control Domestic Hot Water Pre Heat Control Flame Failure or Blocked Condensate Drain Safety Thermostat Activated Boiler or Flue Fault on Fan or Flue Fault on Pump or Low System Pressure Fault on Hot Water Sensor Fault on Central Heating Sensor Power On Domestic Hot Water Mode Central Heating Mode Burner On When neons 24 to 29 are constantly illuminated they indicate
36. for siting flue terminals For GB recommendations are given in BS 5440 Pt I For IE recommendations are given in the current edition of 5 813 Domestic Gas Installations 2 If the terminal discharges onto a pathway or passageway check that combustion products will not cause a nuisance and that the terminal will not obstruct the passageway 3 If a terminal is less than 2 metres above a balcony above ground or above a flat roof to which people have access then a suitable terminal guard must be provided Terminal Assembly 300 lt gt Top View Rear Flue Fig 13 W 1 Property Boundary Line 7 0 Site Requirements Flue Dimensions The standard horizontal flue kit allows for flue lengths between 00mm and 685mm from elbow to terminal Fig 14 The maximum permissible equivalent flue length is Instant 80 HE 4 metres Instant 105 HE 3 metres NOTE Each additional 45 of flue bend will account for an equivalent flue length of 0 5m eg 45 0 5m 90 2 x 45 Im etc Flue Trim The rubber flue trim supplied may be fitted to either the outside wall or on the inner wall of installation Terminal Guard Fig 15 When codes of practice dictate the use of terminal guards they can be obtained from most Plumbers and Builders Merchants 2 There must be a clearance of at least 50m
37. gas H Check and correct if necessary Ignition electrode and lead 2 Electrode connection 3 Spark gap and position Ensure gas is on and purged PCB Al conne term ctor has 230V across inals 2 amp 4 YES neon flashing NO Replace main PCB 230V at Main PCB AI connector across terminals 3 amp 5 Check wiring 14 0 Fault Finding Replace air pressure switch Replace gas valve Turn selector switch to reset position R YES Replace gas valve NO Replace main PCB Replace main PCB Replace gas valve electrical plug amp igniter assembly 47 14 0 Fault Finding Fault Finding Solutions Ensure that mains input terminal L is Live 230V and N is Neutral 0 Check and correct if necessary Flame sensing electrode and lead connections 2 Flame sensing electrode position Replace main PCB Flame current should be uA approx Replace flame sensing electrode Overheat thermostat operated or Allow to cool Continuity amo f YES Replace overheat faulty i e continuity across across thermostat terminals thermostat thermostat terminals more than 1 5 ohm YES Replace main PCB K Check terminal of ON OFF RESET selector isin NO Replace ON OFF RESET selector connection with PCB A4 connector terminal 2 Check electrical continuity across terminals amp a on reset selector when turned to Reset position Ll Replace main PCB L Check conti
38. hould be not less than 5mm dia run continuously downward and discharge outside the building preferably over a drain It should be routed in such a manner that no hazard occurs to occupants or causes damage to wiring or electrical components The end of the pipe should terminate facing down and towards the wall 3 The discharge must not be above a window entrance or other public access Consideration must be given to the possibility that boiling water steam could discharge from the pipe Fig 8 Other Tap Outlets Expansion Vessel Pressure Reducer Taps 6 0 System Details Domestic Hot Water Circuit Fig 8 All DHW circuits connections fittings etc should be fully in accordance with relevant standards the water supply regulations 2 Your attention is drawn to for GB Guidance G17 to G24 and recommendation R7 to R24 of the Water Regulations Guide for IE the current edition of 1 5 813 Domestic Gas Installations 3 A single check valve must be fitted as shown in Fig 8 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 4 When the domestic water system includes any device which prevents water expanding back towards the supply check valve loose jumpered stopcock water meter water treatment device then an expansion vessel must be fitted e g Zilmet 1
39. illing Loop Kit Part No 248221 will simplify the flushing and soundness checking Preparing The Boiler Remove all packaging 2 Stand the boiler on its base by using the rear lower edge as a pivot NOTE A small amount of water may drain from the boiler when the plastic caps are removed from the boiler connections 21 22 Fig 19 Discharge Pipe Fig 18 Wall Plate 8 0 Installation Fitting The Boiler Remove the sealing caps from the boiler connections 2 Lift the boiler using the lower edges Engage the slots at the top rear of the boiler on the wall plate Fig 18 3 Insert the sealing washers between the valves and pipes on the wall plate and the boiler connections The rubber washers must be used on the gas connection 4 Tighten all the connections Fitting the Pressure Relief Discharge Pipe Fig 19 Remove the discharge pipe from the kit 2 Determine the routing of the discharge pipe in the vicinity of the boiler Make up as much of the pipework as is practical including the discharge pipe supplied 3 The pipework must be at least 15mm diameter and run continuously downwards to a discharge point outside the building See section 6 7 for further details 4 Utilising one of the sealing washers connect the discharge pipe to the adaptor and tighten the nut 5 Complete the discharge pipework
40. installers on the Notified Body 0086 process necessary to ensure compliance with Building Regulations For GB IE only C ke gt WRAS henchmark Sos enchmark RECOMMENDED This product has an energy rating scale of A to Baxi is a BS EN ISO 9001 For more information see www boilers org uk This is a certification mark Accredited Company Installer Notification Guidelines Install and Commission this appliance to manufacturer s instructions Competent Person s Self Certification Scheme If you notify via CORGI Scheme CORGI will then notify the relevant Local Authority Building Control Scheme on member s behalf Scheme Members only Call CORGI on 0870 88 88 777 or log onto www corgi notify com within 10 days You must ensure that the notification number issued by CORGI is writen onto the Benchmark Checklist CORGI will record the data and will send a certificate of compliance to the property Complete the Benchmark Checklist Choose Building Regulations Notification Route Building Control Contact your relevant Local Authority Building Control LABC who will arrange an inspection or contact a government approved inspector LABC will record the data and will issue a certificate of compliance IMPORTANT Installation Commiss ioning Service amp Repair This appliance must be installed in accordance with the manufacturer s instructions and the regula
41. ite with the customer 14 0 Fault Finding 42 With the introduction of Self Certification Schemes the 15 0 Short Parts List 49 Benchmark Logbook is being withdrawn However a similar document in the form of a commissioning checklist and service Benchmark Checklist 50 interval record is incorporated at the back of these instructions Potterton is a member of the Benchmark initiative and fully supports the aims of the programme Its aim is to improve the standards of installation and commissioning of central heating systems in the UK and to encourage the regular servicing of all The boiler meets the requirements of Statutory Instrument The central heating systems to ensure safety and efficiency Boiler Efficiency Regulations 1993 N 3083 and is deemed to meet the requirements of Directive 92 42 EEC on the energy Building Regulations require that installations should comply efficiency requirements for new hot water boilers fired with liquid with manufacturer s instructions It is therefore important that or gaseous fuels the commissioning checklist is completed by the installer The relevant section of Building Regulations only relates to dwellings Type test for purpose of Regulation 5 certified by Therefore the checklist only applies if the appliance is being Notified Body 0051 installed in a dwelling or some related structure Product Production certified by The flowchart opposite gives guidance for
42. ith a demand for heating the pump circulates water through the primary circuit At a pre determined flow rate the central heating flow switch operates initiating the ignition sequence 2 The main burner ignites at low rate then the gas valve 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 The pump continues to run during this period 4 When the demand is satisfied the burner is extinguished and the pump continues to run for a period of 30 minutes Pump Overrun 5 If there is no other demand the pre heat function will operate if switched on see Section 3 2 Domestic Hot Water Preheat Mode Fig 3 With the pre heat function switched on pre heat control fully clockwise priority is given to the replenishment of the pre heat store The DHW mode neon qe will flash during this function 2 The diverter valve remains in the DHW priority position This allows the pump to circulate hot water to the store and back to the primary heat exchanger via the bypass pipe 3 The automatic ignition sequence commences after approximately 25 seconds and the burner will light 4 When the store reaches the desired temperature the burner is extinguished The pump continues to run for a period of 30 seconds 5 Following a demand for d
43. ld be suitable for aluminium and comply to BS7593 requirements The only system additives recommended are Betz Dearborn Sentinel X100 and Fernox Copal which should be used following the inhibitor manufacturer s instructions Failure to flush and add inhibitor to the system will invalidate the appliance warranty It is important to check the inhibitor concentration after installation system modification and at every service in accordance with the manufacturer s instructions Test kits are available from inhibitor stockists For information or advice regarding any of the above contact the Baxi Helpline Bypass The boiler is fitted with an automatic integral bypass System Control The boiler is designed for use in a heating system that incorporates external controls i e a minimum of a timer device 2 Suitable timer kits are available as optional extras 3 For optimum operating conditions and maximum economy the fitting of a programmable room thermostat is recommended DHW Temporary CH Mains Hose Return Fig 5 Inlet Fig 6 Filling Loop Pressure Relief Valve Fig 7 Discharge Pipe 6 0 System Details System Filling and Pressurising 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 2 There
44. lly operate for minute in every 24 hours to prevent sticking 4 0 Technical Data Combi Instant 80 HE Appliance Type Cn Power Consumption 170W Central Heating Primary Circuit M 9 Pressures Appliance Category SIT gap Electrical Protection IPX5D bar Heat Input CH Safety Discharge 3 M Mi NO Class 3 ax Operating 2 5 os s in Operating 0 5 kW 24 8 10 6 Condensate Drain BSP Recommend Operating 1 2 Heat Output Non Condensing Flue Terminal Diameter 100mm DHW Circuit bar Max Min Dimensions Projection 125mm Pressures kW 24 98 ax Operating 8 in Operating 0 2 Heat Output CH Condensing Connections copper tails Max Min Gas Supply 22mm in Operating Pressure Central Heating Flow 22mm at 13 2 l min 0 96 ERE E id Central Heating Return 22mm Heat Input DHW Cold Water Mains Inlet 5mm Flow Rates l min DHW Flow 5mm DHW Flow Rate iin 346 Pressure Relief Discharge 5mm 30 C Rise ILS i i DHW Flow Rate Heat Output DHW one UM 780 139 CRIE 2B Max a 4 NT 7 in Working verall Height Inc Flue E kw a Elbow 965mm id aud i Casing Width 450 Pun Max Gas Rate Natural Gas G20 ida i jua Pump After 10 mins Casing Depth 345mm Available Head See graph below m h 2 62 Clearances Expansion Vessel For
45. low Rate Pressure Relief Discharge 15mm 30 C Rise 14 i is n DHW Flow Rate Heat Output DHW egt 780mm dd Pe Overall Height Inc Flue in voriang kW 296 Elbow B DHW Flow Rate 25 Casing Width 450mm Puma Max Gas Rate Natural Gas G20 Casing Depth amp Cmm After 10 mins vailable Head See graph below m h 322 Clearances Expansion Vessel For Central Heating only Above Casing 200 mm Min ntegral with appliance Burner Pressure Natural Gas G20 Below Casing 200 mm Min bar Max Rate Min Rate Front 450 mm Min For Servicing in Pre charge Pressure 05 mbar 12 1 05 21 0 2 Front 5 mm Min In Operation L H Side 5 mm Min litre Inlet Pressure Natural Gas G20 RH Side 5 mm Min In Operation ax Capacity of mbar 20 20 mm Min See Note CH System 80 Burner Injector Natural Gas G20 NOTE The boiler can be operated with a Primary Water Content 3 2 25m Diareter clearance of 5mm at the right This is also sufficient of Boiler unpressurised for routine maintenance However a clearance of Electrical Supply 230V 50H 20mm is required if it is necessary to remove the Temperatures Appliance must be connected to an secondary heat exchanger This should be CH Flow Temp adjustable earthed supply considered when siting the appliance and in the 35 C to 85 C max 5 C event of any subsequent alterations in the area of External Fuse Rating 3A installation D H W Flow Temp 35 C to 65 C max 5 C
46. m between any part of the terminal and the guard 3 When ordering a terminal guard quote the appliance name and model number 3 The flue terminal guard should be positioned centrally over the terminal and fixed as illustrated 7 0 Site Requirements Flue Options The Baxi Combi Instant 80 HE and 105 HE can be fitted with flue systems as illustrated 2 The standard flue is suitable only for horizontal applications 3 Maximum permissible equivalent flue lengths are Instant Instant 80 HE 105 HE Concentric 4m 3m Vertical 4m 3m Vertical Two Pipe 12m 12m Horizontal Flues 4 Any additional in line bends in the flue system must be taken into consideration Their equivalent lengths Concentric Pipes 45 bend 0 5 metres 93 bend 1 0 metres Twin Flue Pipe 45 bend 0 25 metres 91 5 bend 0 50 metres The elbow supplied with the standard horizontal flue is not included in any equivalent length calculations 5 The illustrations opposite show examples of maximum equivalent lengths Vertical 6 Full details of part numbers and descriptions of all Flues optional flue components and kits can be found in the Twin Pipe Baxi Flue Guide 7 Instructions for guidance and fitting are included in each kit where appropriate EP gt E Vertical ES Flues 20 Flushing Tube Central Heating Return Fig 16 Fig 17 For Sid
47. mble in reverse order Turn the knob to the required setting 37 Plate Heat Exchanger o Rubber Seal Offset Stud Fig 67 Rubber Seal Spring Clip 2 DHW Pressure Differential Valve Microswitch Sensing Pipe Fig 68 Diaphragm Diaphragm Spring Fig 69 DHW Pressure Differential Valve Cover 38 12 0 Changing Components Plate Heat Exchanger Fig 67 Drain the primary circuit 2 While supporting the heat exchanger undo the screws securing it to the brass manifolds 3 Withdraw the heat exchanger upwards and to the left of the gas valve taking care not to damage any wires or controls Seals 4 There are four rubber seals between the manifolds and heat exchanger which may require replacement 5 Ease the seals out of the manifolds Replace carefully ensuring that the seal is inserted into the manifold parallel and pushed fully in 6 When fitting the new heat exchanger note that the left hand location stud is offset towards the centre more than the right hand one 7 Reassemble in reverse order Diverter Valve Assembly Figs 68 amp 69 The diverter valve assembly comprises of a central heating pressure differential valve and a domestic hot water pressure differential valve These are connected to a manifold which is joined to the plate heat exchanger DHW Pressure Differential Valve Diaphr
48. n or gully Holes in the soak away must iv to a purpose made soakaway face away from the building Fig 12 Likely flue positions requiring a flue terminal guard Terminal Position with Minimum Distance Fig 12 A Directly below an openable window air vent or any other ventilation opening 300 B Below gutter drain soil pipe 25 C Below eaves 25 D Below a balcony car port roof 25 E From vertical drain pipes and soil pipes 25 F From internal or external corners 25 G Above adjacent ground or balcony level 300 From a surface facing a terminal 600 Facing a terminals 1200 From opening door window in carport into dwelling 1200 Vertically from a terminal on the same wall 1500 orizontally from a terminal on the same wall 300 Above an opening air brick opening window etc 300 Horizontally to an opening air brick opening window etc 300 n addition the terminal should be no nearer than 50mm to an opening in he building fabric formed for the purpose of accommodating a built in element such as a window frame See BS 5440 Pt 1 7 0 Site Requirements Flue NOTE Due to the nature of the boiler a plume of water vapour will be discharged from the flue This should be taken into account when siting the flue terminal The following guidelines indicate the general requirements
49. ner extinguishes after 10 neon flashing seconds Go to section I amp N NO Spark at ignition electrode for up to 10 seconds Change main PCB Burner output modulates to minimum heat input until a temperature of 75 C is Go to section G detected by central heating NTC sensor YES YES 42 Pump continues to run for 30 seconds YES Operation sequence Fan stops gt correct 14 0 Fault Finding Domestic Hot Water Follow operational sequence Turn On Off Reset selector to QE position neon illuminated YES Primary water diverted to NO Got tion M DHW preheating rct YES Go to section L External controls and where Ensure controls are set to fitted integral timer calling for demand and verify the contacts heat are closed f flashing Replace diaphragm i YES Open DHW tap fully DHW DHW flow rate more than 2 5 ls mains water filter and DHW flow valve diaphragm flow switch operated l min differential assembly clean damaged YES NO NO Replace DHW flow microswitch terminals and PCB obstructed YES A5 connector terminals 5 amp 6 Replace main PCB P O neon flashing Go to section E YES Y Turn the selector to reset If regular resetting is required Q3 neon flashing i i Go to section J or O Go to section crapplance doesnt Fae Goto seton orior operate investigation Is neon fla
50. ng installation requirements and notes IRN a IRN 001 See text of entry for installation requirements and notes b IRN 116 Byelaw 90 and 91 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 Central Heating Circuit The appliance is suitable for fully pumped SEALED SYSTEMS ONLY Treatment of Water Circulating Systems All recirculatory water systems will be subject to corrosion unless an appropriate water treatment is applied This means that the efficiency of the system will deteriorate as corrosion sludge accumulates within the system risking damage to pump and valves boiler noise and circulation problems When upgrading existing systems that exhibit evidence of sludging it is advisable to clean the system prior to treatment in order to remove any sludge and reduce the likelihood of these deposits damaging new components When fitting new systems flux will be evident within the system which can lead to damage of system components All systems must be thoroughly drained and flushed out The recommended flushing and cleansing agents are Betz Dearborn Sentinel X300 or X400 and Fernox Superfloc Universal Cleanser which should be used following the flushing agent manufacturer s instructions System additives corrosion inhibitors and flushing agents descalers shou
51. nuity of loop on Replace main PCB 10 connector M Is there 230V at 5 Diverter valve operating head Replace diverter valve operating head PCB A8 connector terminals amp 5 central heating function Replace main PCB amp 3 DHW function YES Change motor supply cable If checks in section are completed successfully blockage of the condensate drain or trap may have occurred If checks in section J are completed successfully the flue overheat thermostat may have operated Press the reset button on the flue overheat thermostat If the boiler does not relight or repeatedly cuts out Check the operation of the flue system or replace the flue overheat thermostat 15 0 Short Parts List Short Parts List Description Manufacturers 44 No No Part No 22 Fan 105 5112430 Fan 80 5112627 23 Pressure Switch 105 248466 Pressure Switch 80 5112999 32 Heat Exchanger 5112431 4l Burner 248029 169 44 Injector 105 5112376 Injector 80 248210 59 E66 408 Electrode Lead 248037 63 E66 411 Spark or Sensing Electrode 247384 yp E66 539 Pump Complete 248042 154 3l Temperature Sensor 5108265 35 E66 439 Safety Thermostat 248079 40 Gas Valve 5107339 54 E68 347 PCB 248731 69 E66 453 Pressure Gauge 248090 387 E68 349 otor 3way Valve 248733 390 E68 350 Differential Valve DHW 248734 37l gniter Gas Valve Cable 5112
52. o release the valve 3 Note the orientation of the valve rotate it and withdraw it from the manifold 4 Fit the new valve and O ring seal and set to the previously noted orientation Reassemble in reverse order PREM P C B Fig 66 Note the settings of the temperature control knobs Rotate the knobs 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 65 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 Transfer the control knob drive pins to the new P C B and turn them fully anticlockwise 5 Reassemble in reverse order ensuring that the temperature controllers are reset to their previous positions Ip Selector Switch Fig 66 Turn the selector switch knob to the off position and carefully pull it off the facia 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 65 3 Note the position of the electrical connections and the orientation of the switch Remove the electrical connections 4 Remove the screws securing the switch to the facia panel 5 Fit the new switch and reasse
53. omestic hot water or the end of a central heating ON period the pre heat function restarts Domestic Hot Water Mode 1 28 26 2 3 4 7 5 6 25 24 20 22 l Qr 19 18 y 23 8 ve 1l HI 2 19 LH 9 Fig 4 16 15 14 3 2 Key Primary Heat Exchanger 15 Domestic Hot Water Outlet Burner Ignition Electrode Flame Sensing Electrode Gas Valve Pump Automatic Air Vent Plate Heat Exchanger Flow Sensor with Filter Pressure Relief Valve Boiler Drain Point Heating Return Cold Water Inlet On Off Valve and Filter Gas Inlet 16 Heating Flow 7 Pressure Gauge 18 Hydrau ic Pressure Sensor Microswitch 19 Automatic By Pass 20 Hydraul 21 Diverte 22 Domes 23 Domes 24 Safety ic Pressure Sensor r Valve Assembly ic Hot Water Flow Priority Assembly ic Hot Water Flow Priority Microswitch hermostat 25 Central 26 Expansi 27 Domes 28 Second Heating Temperature Sensor on Vessel amp Pre Heat Store c Hot Water Temperature Sensor ary Heat Exchanger 3 0 Appliance Operation Domestic Hot Water Mode Fig 4 Priority is given to the domestic hot water supply A demand at a tap or shower will override any central heating requirement 2 The flow of water will operate the DHW flow switch which requests the 3 way
54. pipes around local obstructions such as joists running parallel to the front face of the boiler NOTE The boiler can be operated with a clearance of 5mm at the right This is also sufficient for routine maintenance However a clearance of 20mm is required if it is necessary to remove the secondary heat exchanger This should be considered when siting the appliance and in the event of any subsequent alteration in the area of installation Gas Service Cock 7 0 Site Requirements Ventilation of Compartments Where the appliance is installed in a cupboard or compartment no air vents are required as the appliance will run sufficiently cool without ventilation Gas Supply 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 2 The connection to the appliance is a 22mm copper tail located at the rear of the gas service cock Fig 1 3 Ensure that the pipework from the meter to the appliance is of adequate size Do not use pipes of a smaller diameter than the boiler gas connection 22mm Electrical Supply External wiring must be correctly earthed polarised and in accordance with the relevant regulations rules In GB this is the current I E E Wiring Regulations In IE reference should be made to the current edition of the ETCI rules 2 The mains supply is 230V
55. r Remove the cover Fig 27 4 Slacken the cable clamp on the LH side of the boiler chassis Fig 28 Insert the cable through the clamp and route it to the terminal block 5 Slacken the screws in the terminal block connect the input cable and tighten the screws 6 If an external control is to be connected it can be done at this point Run the input cable from the external control through the second cable clamp on the boiler chassis Refer to the instructions supplied with the control 7 To connect external control s remove the link between terminals amp 2 The 230V supply at terminal must be connected to the external control The switched output from the external control must be connected to terminal 2 Fig 29 NOTE If the room thermostat being used incorporates an anticipator it MUST be wired as shown in Fig 29 IMPORTANT The external control MUST be suitable for 230V switching 8 Ensure that both mains input and where fitted external control input cables have sufficient slack to allow the control box to drop down Tighten the cable clamp s on the boiler chassis 9 If the optional integral timer is to be used it should be fitted at this point Refer to the instructions supplied with the timer NOTE An external frost thermostat cannot be used with the integral timer Se Preliminary Electrical Checks Prior to commissioning the boiler preliminary electrical system checks shoul
56. r away and disconnect the electrical plug 3 Unscrew the sensor from the plate heat exchanger manifold Examine the sealing washer replacing if necessary 4 Reassemble in reverse order The electrical plug will only fit one way 12 0 Changing Components Pump Head Only Fig 57 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 Grundfos 15 60 replacement head can now be fitted Connect the wiring to the new head The pump speed must be set to 3 Fig 58 4 Reassemble in reverse order Pump Complete Fig 59 Drain the primary circuit and unscrew the automatic Pump Wiring Cover air vent from the pump body Undo the two screws securing the body to the pipe and manifold and draw the pump forwards 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 Socket Headed gt Screw 3 Connect the wiring to the new pump Examine the O ring seals on the return pipe and manifold replacing 3 if necessary P
57. recorded 4 For IE it is necessary to complete a Declaration of Conformity to indicate compliance with 1 5 813 An example of this is given in 1 5 813 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 11 0 Servicing the Boiler Annual Servicing For reasons of safety and economy it is recommended that the boiler is serviced annually Case Front Panel Servicing must be performed by a competent person 2 After servicing complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication 3 Ensure that the boiler is cool 4 Ensure that both the gas and electrical supplies to the boiler are isolated 5 Slacken the screws securing the facia panel Lift the outercase panel so that its securing tabs are clear of the Fig 39 facia Remove the panel Fig 39 6 Remove the screws securing the inner door panel Lift Facia Panel Securing he panel slightly to disengage it from the studs on top of Screws he case Fig 40 Fan Wires i A Fan 7 Note the positions of the two sensing tubes on the A fan spigot 105 model Only one tube on 80 model and hree wires on the fan motor and remove them Fig 41 0 Y amp
58. rode being replaced Undo the securing screw and withdraw the electrode to the burner 4 Reassemble in reverse order Insulation Fig 53 Remove the four screws securing the combustion box door and remove the door 2 Slide the side insulation pieces carefully out of their carriers 3 To replace the rear insulation piece it is necessary to remove the heat exchanger as described in Section 12 3 and slide out the side pieces Big insite 4 The combustion box door insulation piece can be Rear Insulation replaced by carefully bending up the two retaining tabs 5 Replace all insulation pieces and reassemble in reverse order Side Insulation Combustion Box Door Front Insulation Instant 105 HE model shown Fig 53 33 Ignition AS Modulator we Wires d F Hd e E Gas Valve Electrical Plug 4 Earth Wire Inlet Pipe Gas Feed Pipe Fig 54 Fow Pipe Central Heating Temperature Sensor ew et A Safety Thermostat Fig 55 DHW Temperature Sensor 34 Fig 56 12 0 Changing Components Gas Valve Fig 54 Undo the nut on the gas feed pipe under the boiler 2 completely undo the securing screws and hinge the facia panel down 3 Disconnect the wires from the valve modulator and the ignition lead from the spark generator Disconnect the pressure sensing pipe from th
59. rol Fig 33 26 Fig 34 Plastic Protection Modulator Wire Fig 35 Power On Fig 37 Adjustment Nut Selector Switch Burner Pressure Test Point Sealing Screw Inlet Pressure Test Point Sealing Screw Gas Valve Maximum Rate Adjustment Nut NOTE Gas Valve Electrical Plug Igniter not shown for clarity Pressure Gauge 40 50 60 70 80 ro by 111 4 Central Heating Temperature Control Temperature Control 9 0 Commissioning the Boiler Checking the Burner Pressure Turn on the gas and electrical supplies to the boiler and ensure that all external controls are calling for heat 2 Set the hot water and central heating temperature controls to maximum and the selector switch to the OFF position Fig 37 3 Slacken the pressure test point sealing screw Fig 34 on the gas valve and connect a pressure gauge 4 Disconnect the sensing tube from the gas valve Fig 34 5 Turn the selector switch fully anticlockwise against the spring pressure to position R and hold for 2 seconds to reset the boiler 6 Turn the selector switch to the Central Heating and Domestic Hot Water position W The power ON neon will illuminate Fig 37 7 Turn on a hot water tap to give a flow rate of at least l min 8 The pressure should be Instant Instant 80 HE 105 HE NG 0
60. s BS 5449 Forced circulation hot water systems BS 6798 Installation of gas fired hot water boilers BS 5440 Part Flues BS 5440 Part 2 Ventilation BS 7074 Expansion vessels and ancillary equipment for sealed water systems BS 7593 Treatment of water in domestic hot water central heating systems In IE the following Codes of Practice apply Standard Scope 15 813 Domestic Gas Installations The following BS standards give valuable additional information BS 5546 Installation of hot water supplies for domestic purposes BS 5449 Forced circulation hot water systems BS 7074 Expansion vessels and ancillary equipment for sealed water systems BS 7593 Treatment of water in domestic hot water central heating systems Control Box Fig Case Front Panel Data Bad ge 1 0 Introduction 1 Description The Baxi Combi Instant 80 HE or 105 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 unit incorporates a small storage cylinder built into the boiler providing hot water the moment the tap is turned on 3 The boiler is set to give a maximum output condensing of 252 kW Instant 80 HE or 31 0 kW Instant 105 HE 4 It is designed for use on Natural Gas G20 and can be converted to use Propane 5 The boiler is suitable for u
61. se only on fully pumped sealed heating systems Priority is given to domestic hot water 6 The boiler data badge gives details of the model serial number and Gas Council number and is situated on the control box It is visible when the case front panel is removed Fig 1 7 The boiler is intended to be installed in residential commercial light industrial E M C environments on a governed meter supply only 8 The boiler must be installed with one of the purpose designed flues such as the standard horizontal flue kit part no 5111073 9 All systems must be thoroughly flushed and treated with inhibitor see section 6 2 Instant Domestic Hot Water Expansion Vessel amp Pre Heat Store The boiler expansion vessel incorporates a small volume of stored primary hot water 2 When the boiler has been off and there is then a demand for domestic hot water the stored primary hot water ensures that domestic hot water is supplied instantly at temperature 3 The stored hot water is part of the primary circuit This is not supplied as domestic hot water which is fresh mains water heated by a heat exchanger within the boiler 4 The stored primary hot water temperature is maintained whilst the boiler is in operation During a period when there is no demand for heating or hot water the temperature of the stored primary hot water will eventually fall The boiler will operate occasionally in order to maintain the temp
62. shing necessary R I neons flashing NO Go section D Air pressure switch proved neon flashing ne Go to section E Turn selector to the reset YES Turn preheat control to on Preheating function starts after 25 seconds Primary water is diverted from preheating circuit to DHW heat exchanger neon illuminated YES position If the neon does not extinguish go to sections H and mem NO Spark at ignition electrode for K flash Yes Y NO Change main PCB YES Y YES i Burner extinguishes after O mmm neon flashing Go to section I amp N e Reduce the DHW flow rate If burner does not modulate clean DHW temperature sensor and DHW heat exchanger If modulation does not occur go to section Burner output modulates to maintain temperature set at preheat control ow Valve senses ho Ensure controls are set to flow DHW flow switch demand and verify the controls released off are closed External controls and wh Preheating function restarts Er un an i YES TFT fitted integral timer calling for J Go to section L neon flashing an T Y B YES TES Pump continues to YES Operation sequence run for 30 seconds correct 43 14 0 Fault Finding Central Heating Follow operational sequence Turn selector to NO Go to section A neon illuminated NO
63. te and lay it on either side on a clean flat surface 4 Undo the unions on pipe A and remove the pipe 5 Undo the union on pipe B connected to the vessel and remove the locknut securing the vessel spigot to the boiler chassis 6 Undo the screws and remove the appliance upper cross member Slide the expansion vessel and insulation out of the retaining clips 7 Reassemble in reverse order using new sealing washers Fully recommission the appliance and system PAVA Condensate Trap Fig 63 Disconnect the two sensing wires from the trap connections 2 Squeeze together the wire spring clip to release and ease the inlet pipe from the trap spigot 3 Undo the nut securing the condensate drain pipe to the trap Disconnect the pipe and sealing washer 4 From underneath the boiler remove the screws securing the trap bracket 5 Remove the trap and bracket from the boiler Undo the locknut securing the trap to the bracket 6 Reassemble in reverse order Fig 64 Fig 65 Facia Selector Switch Knob Selector Switch 8 rub Screw Pressure Relief Valve TN e Drive Pins Temperature Control Knobs 12 0 Changing Components IPAE Pressure Relief Valve Fig 64 Drain the primary circuit 2 Disconnect the discharge pipe from the valve Using a suitable hexagon key undo the grub screw sufficiently t
64. tions in force Read the instruc appliance ions fully before installing or using the In GB this must be carried out by a competent person as stated in the Gas Safety Installation amp Use Regulations Definition of competence A person who works for a CORGI registered company and holding current certificates in the relevant ACS modules is deemed competent In IE this must be carried out by a competent person as stated in 1 5 813 Domestic Gas Installations Lifting This product should be lifted and handled by two people Stooping should be avoided and protective equipment worn where necessary Carrying amp lifting equipment should be used as required when installing in a loft space The addition of anything that may interfe without express written permission from re with the normal operation of the appliance the manufacturer or his agent could invalidate the appliance warranty In GB this could also infringe the Gas Safety Installation and Use Regulations Warning Check the information on the conditions data plate is compatible with local supply All CORGI registered installers carry a CORGI identification card and have a registration number You can check your 0870 4012300 or writing to installer is registered by telephoning Elmwood Chineham Business Park Croc kford Lane Basingstoke RG24 8WG or check online at www corgi gas safety com Legislation B
65. ump Head 4 Fit the air vent to the pump body and reassemble in Fig 57 reverse order PAES Automatic Air Vent Fig 59 Drain the primary circuit and unscrew the automatic air vent from the pump body Pump Setting Automatic Air 2 Examine the O ring seal replacing if necessary and Vent e Fig 58 fit it to the new automatic air vent ey 3 Reassemble in reverse order Pump Wiring Cover Fig 59 35 Fig 60 Pressure Gauge Capillary Gauge Retaining Bracket Fig 61 Lock Nut Pipe B Fig 62 Pipe A Clip Fig 63 Condensate Drain Pipe 36 Retaining Clip Appliance Upper Cross Member 12 0 Changing Components Pressure Gauge Figs 60 amp 61 Drain the primary circuit and undo the nut on the pressure gauge capillary 2 Remove the timer cover and ease the timer wiring aside Undo the screws securing the gauge retaining bracket 3 Remove the bracket and gauge assembly Depress the barbs on the side of the gauge and remove the retaining bracket 4 Reassemble in reverse order Expansion Vessel amp Pre Heat Store Fig 62 To replace the expansion vessel and pre heat store it is necessary to remove the boiler from the wall 2 Drain the system and undo all gas water and condensate drain connections Remove the flue elbow 3 Lift the boiler off the wall pla
66. valve to change position This will allow the pump to circulate the primary water through the DHW plate heat exchanger and take the stored water to give instant hot water 3 The burner will light automatically and the temperature of the domestic hot water is controlled by the temperature sensor 4 When the domestic hot water demand ceases the burner will extinguish and the diverter valve will remain in the domestic hot water mode unless there is a ng demand for central hea 5 If there is no other demand the pre heat function will operate if switched on see Section 3 2 IMPORTANT When the selector switch is in the 0 Off position the electrical supply to the boiler is isolated The boiler will not operate and the integral timer if fitted will require resetting once the selector switch is set to either Position i or Position ii Frost Protection Mode The frost protection mode is integral to the appliance and functions only with the selector switch see Section 2 1 in the domestic hot water and central heating position If the system temperature falls below 5 C then the boiler will fire on its minimum setting until a flow temperature of 30 C is reached Further protection can be incorporated by using a system frost thermostat Pump Protection With the selector switch see Section 2 1 in either the central heating or central heating and hot water position the pump will automatica

Baxi Combi Instant 80 HE and 105 HE Quick Start Manual

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