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1. FNE A M Fig 77 Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the sealed chamber lid 2 Disconnect the connectors D Fig 78 and measure the electrical resistance of the motor that has to be about 25 Q M96 28SM at ambient temperature 32 Fig 78 Mm Check of the Air pressure switch operation NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the sealed chamber lid 2 Disconnect the wires and check the electrical re sistance between the connections of the Air pres sure switch Refer to the Fig 79 in accordance with the type of air pressure switch used Between COM or3 and N O or 2 the contact must be open Between COM or 3 and N C or 1 the contact must be closed electrical resistance zero 3 Connect the grey wire COM or 3 4 Run the boiler the Fan must run and check the the electric resistance between COM or 3 and N O or 2 Between COM or 3 and N O or 2 the contact must be closed electrical resistance zero Fig 79 Check of the venturi device This test must be carried out with the sea
2. 13 FUNCHON aa te Mee 13 Checks uva caida aa 13 Removal of the electric actuator 13 Removal of the diverter group and its internal parts 14 Electronic control ignition p c b 15 FUNCION a tota ea aus 15 Selection and adjustment devices 15 Checking the temperature 16 Operation lights 17 Setting the boiler control function modes 17 Reignition frequency setting 18 Combi C H only mode setting 18 Ignition gas pressure adjustment 19 A E 20 Removal of the electronic control p c b 20 Thermal control in the mode 22 Thermal control in the mode 22 Ignition and control sequence 23 Modulating gas valve 24 FUNCUOMN e sai maa sages 24 11 2 Nomenclature of the parts Fig 54 24 113 Adjustment ss usus usu l g uay ul aa 24 11 4 Checks 25 11 5 Removal of the gas valve 25 12 Primary circuit flow switch 26 12 1 Function 0 0 0 e eee eae 26 122 CHECKS cama dic tates dare a teen 26 12 32 Removal u oni Aen eae e 26 13 Expansion vessel and temperature pressure gauge 28 13 1 O PFUNGHON cc tee l 244 be iene 28 13 2 Checks cs sia cosa aaa ga hese aQ aad cers 28 13 3 Removal of the expansion vessel 28 13 4 Removal of the temperature pressure gauge 28 14 D h w f
3. trap SR EE EN xe 2 ES k JE O x1 53 F2 F1 KT K3 K a x5 A O e K2 JL bn om bu ze we E X4 E bk pa wh LI N 5 38 38 E Fa IL LUEBEBEEE gy Ee oy J eS TA x11 F E 2 Q F E C P q T ze lt 7 z Z P4 F LE p LDH sB 4 J P5 Bi 1 4 3 wh bk wh ihhh l IT wh N bu Na bk N wh Vo rd Remote control D h w flow C h temperature Modulating Safety Flue D h w temperature Time switch terminal block switch probe NTC gas valve thermostat temperature probe NTC probe NTC bn brown ye yellow bu blue vt violet bk black og Orange wh white gnye green yellow rd red alternative yellow gy grey gn green Diagrams EF Functional flow diagrams General layout J1 1 Fuse 1 6A T PTC Electronic control p c b low voltage section Transformer x L gt D A J3 5 q J3 4 x J3 3 Three way diverter valve y1 2 N Pump Heat request on d h w J1 1 Fuse 1 6A T PTC L LINE N NEUTRAL ACTIVE CIRCUIT INACTIVE CIRCUIT Heat request on c h J1 1 Fuse 1 6A T PTC CANONA low voltage section Transformer x J2 5 J2 4 C Full sequence ignition device Electronic control p c b low v
4. Fig 68 When the flow rate through the d h w circuit reaches about 2 5 litres min the float 5 Fig 68 is dragged up wards and the magnetic in it getting closer to the sen sor 8 closes the electric contact Fig 69 EAB Description and location of parts Fig 70 Flow switch plug O ring Threaded ring Body Float Filter Sensor holder spring Sensor AN O O GQ N S Na Fig 70 PEN Checks Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component mr Sensor operation Remove the front panel of the case 2 Measure the electrical resistance at the leads of the sensor Without water being drawn the con tact must be open By opening a hot water tap the contact must be close electrical resistance zero Q ZEN Removal of the sensor NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case 2 Disconnect the connectors B and remove the sensor holder spring C Fig 69 3 Remove the sensor TEN Removal of the flow switch group and d h w circuit filter NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case and empty the d h w circuit 2 Remove the sensor see section 14 4 3 Remove the fork D and pull up the flow switch plug 1 with
5. EXI Function The diverter valve A Fig 21 has the function of modify ing the hydraulic circuit of the boiler by means of an electric command given by the electronic control p c b in order to send the water that exits the primary heat ex changer towards the c h system or towards the d h w heat exchanger Fig 21 EF Checks Mm Check the electrical continuity Fig 22 indicates the relationship between the electric command coming from the electronic control p c b and the position of the actuator B when the boiler oper ates in d h w mode Fig 23 indicates the relationship between the electric command coming from the electronic control p c b and the position of the actuator B when the boiler oper ates in c h mode bn brown bu blue bk black Fig 22 D h w mode bn brown bu blue bk black Fig 23 C h mode EEN Removal of the electric actuator Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front case panel 2 Disconnectthe lockpins C and move upwards the electric actuator D Fig 24 13 Three way diverter valve 2 Empty the primary circuit and the d h w circuit of the boiler 3 Remove the electric actuator see section 9 3 4 Remove the lockpins rotating and pulling them forward Fig 24 5 Rotate the plate J until the notch K is on the posi tion
6. 38 21 1 Function 38 21 2 Removal u g uz uapa ass eee eee 38 22 Short spare parts list 39 1 Overall information EX Overall View Flue thermostat Air pressure ese switch PRA Condensing heat exchanger Expansion vessel Main heat exchanger Combustio i s il afety chamber thermostat Burner L Ignition k electrodes a gt ITEN Detection _ me a Automatic electrode air release Diverter valve valve C h temp D robe D h w Main circuit heat exchanger ain circui A i fl itch wal gt en _ m OWSWIIG iii i Condensate D h w temp PN tap BEID probe Wo pl Gas valve 7 i Pump Control panel EE Hydraulic diagram Central heating c h operation Domestic hot water d h w operation amas C h C h D h w D h w water return water flow inlet outlet 2 General access and emptying hydraulic circuits EXI Nomenclature Right side panel Front panel Control panel lid 1 2 3 4 Control panel cover 5 Service panel 6 Left side panel PFI Body panels NN Warning isolate the boiler from the mains electricity supply before removing any covering or component For the most part of the check and maintenance oper ations it is necessary to remove one or more panels of the case The side panels can be removed only after the removal of th
7. Wall hung fan flue room sealed high efficiency gas boiler Service manual RIVA COMPACT HE Models G C Appl No M96 28SM C2 47 583 06 Leave this manual adjacent to the gas meter Table of contents 10 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 12 10 12 10 13 11 11 1 Overall information 1 Overall View 1 Hydraulic diagram 1 General access emptying hyd circuits 2 Nomenclature 2 Body panels 2 Control panel 2 Access to the sealed chamber 3 Emptying the primary circuit 3 Emptying the d h w circuit 3 Diagrams 4 Wiring diagram M96 28SM C2 4 Functional flow diagrams 5 Circuit voltages 6 Fault finding 7 Primary heat exchanger 9 FUNCION io ca te ees 9 Removal 9 Cleaning 9 Condensing heat exchanger 10 F ceti n renas aed otu ar aqp a 10 Removal 10 D h w heat exchanger 11 FUNCHOM c z am a aa eee Be 11 Removal 11 PUMP td 12 FUNCHION jon a u aba saw ae eae 12 GheCKS Sanr ran tran aaah tenes 12 Removal 12 Three way diverter valve
8. maximum power output During the c h operation Fig 30 the signal coming from the c h temperature probe is compared to the sig nal given by the control panel through the adjustment made by the user knob m The result of such a com parison operates the modulation of the gas valve consequently changing the useful output of the boiler 1 2 3 4 5 6 7 8 co 16 When the boiler functions in d h w Fig 31 the signal coming fromthe d h w temperature probe is compared with the signal given by the control panel through the adjustment made by the user knob bet Fig 31 Normally the result of the comparison between these two signals directly operates the adjustment elements ofthe gas valve modulation device adjusting the useful output generated in order to stabilize the temperature of the exiting water If during the d h w mode operation the temperature of the primary circuit goes over 75 C the useful output is automatically reduced so that the primary circuit can not reach excessive temperatures The control sequences in s function and in 3 func tion are illustrated in detail in sections 10 11 and 10 12 EN Operation lights The Electronic control ignition p c b is provided with three lamps L E D indicators 10 in Fig 29 that give optical information during the operation of the boiler The green lamp on the left gives information whether the boiler is in stand
9. Checks 1 Overheat temperature value 1 Set the temperature control knobs to their max position and run the boiler in d h w and c h 2 Allow the boiler to reach its maximum operating temperature monitor the temperature gauge on the instrument panel The boiler should maintain a temperature below that of the Flue temperature probe NTC and no overheat intervention should occur EXE Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the sealed chamber lid 2 Disconnect the wires from the Flue temperature probe NTC 3 Unscrew and remove the thermostat probe B Fig 91 from the condensing heat exchanger 4 Assemble the Flue temperature probe NTC carry ing out the removal operations in reverse se quence 37 21 Condensate trap ARH Function The condensate trap A in Fig 92 and Fig 94 allows the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combus tion products A plastic ball closes the trap outlet in case that the trap is empty Fig 93 Ifthe drain pipe is plugged or in any case in which the condensate isn t correctly evacuated the condensate level in the trap rises putting in contact the electrodes thus causing the boiler lock out AEJ Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or com
10. boiler devices C h temperature probe NTC D h w temperature probe NTC D h w flow switch Primary circuit flow switch Air pressure switch Flue temperature probe NTC Safety thermostat Flame detection electrode Room thermostat if fitted Time switch Outlet command Pump Three way diverter valve On off operators gas valve Modulation operator gas valve Fan Ignition electrodes Appliance operation lights Lock out signal lamp control panel fascia The fundamental function of the Electronic control igni tion p c b is that of controlling the boiler in relation to the external needs i e heating the dwelling or heating the water for d h w use and operating in order to keep the temperature of the hydraulic circuits constant This is obviously possible within the useful power and maximum working temperature limits foreseen Generally the Electronic control ignition p c b receives inlet information coming from the boiler the sensors or from the outside knobs room thermostat etc pro cesses it and consequently acts with outlet commands on other components of the boiler Fig 28 The Electronic control ignition p c b is also a full se quence ignition device and does a sequence of oper ations ignition cycle which lead to the ignition of the gas at the burner It checks the presence of the flame during the entire period in which it is activated supplies the fan and checks its functioning by me
11. composed of 8 elliptical pipes comected in parallel Fig 10 Fig 10 ERIN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the case panels and the sealed chamber lid see section 2 2 Empty the primary circuit of the boiler 3 Remove the combustion chamber lid B by un screwing the screws C and removing the clamp D Fig 11 4 Remove the screws E and the plate F 5 Loosen the connection G and slightly move the pipe H upwards 6 Remove the clip and the safety thermostat J It is not necessary to disconnect it from the wiring 7 Remove the fork K and move the pipe L down wards freeing it from the connection of the pri mary het exchanger 8 Remove the clip M 9 Move the pipe N upwards freeing it from the con nection and rotate towards right 10 Remove the heat exchanger by sliding it for wards 11 Reassemble the boiler carrying out the removal operations in reverse order Fit the clip with the arrow pointing upwards as illustrated in Fig 11 IMPORTANT do not force the connection G when tighting it EEN Cleaning If there are deposits of soot or dirt between the blades of the heat
12. each connector 3 Remove the spindles of the c h and d h w tem perature adjustment knobs by delicately pulling them with pliers in the direction shown by the arrow in Fig 48 4 Unscrew the four screws that hold the Electronic control ignition p c b on to the control panel 5 Remove it by lifting its rear edge and freeing it from any of the wiring 6 Re assemble the Electronic control ignition p c b following the removal procedures in the re verse order Electronic controllignition p c b Important When re assembling the Electronic control ignition p c b 7 Fit the p c b into the control panel by first insert ing the front lower edge under the control knob shafts Lower the rear edge and ensure that no wiring is trapped beneath Insert the spindles in the control panel knobs un till the notch A Fig 49 reaches the potentio meter edge It is not necessary to force them in the knob While tightening the screws that fix the Electronic control ignition p c b on the control panel keep the p c b towards the control panel fascia mak ing sure of the contact between the boiler reset button B and the tab C Fig 49 ON 10 11 12 Attention After installing the Electronic control ignition p c b Make sure the c h m and d h w A tem perature adjustment knobs can move freely for the complete range If not remove the spindle again as described at step 3 turn the k
13. etc check that the fuses 11 Fig 29 are complete 20 Ifa fuse has blown replace it with one that has the same characteristics after having identified the reason for fail ure J 4 Lock sequence Start the boiler until the burner is ignited With the burner firing interrupt the gas supply The Electronic control ignition p c b must carry out three complete ignition cycles and then after about 3 min utes goes to lock out state By turning the boiler on and off by means of the function switch the device must not unlock and the burner must not turn on Mm Fan functioning device With the boiler operating and the burner on open the negative pressure test point of the Venturi device At the moment of opening the burner must turn off ELAI Removal of the electronic control p c b NN Warning isolate the boiler from the mains electricity supply before removing any covering or component When replacing the Electronic control ignition p c b itis advisable to go through the setting modes of the boiler 1 Gain access to the parts located inside the con trol panel as explained in the section 2 3 of this manual 2 Remove all the wiring connected to the Electronic control ignition p c b To disconnect the connectors x1 x6 and x7 1 2 and 3 in Fig 29 delicately flex the hook present on one side of each socket To disconnet the connectors x4 and x2 4 and 5 in Fig 29 press delicately the hook present on one side of
14. exchanger clean with a brush or non me tallic bristle brush In any case avoid any actions that can damage the pro tective varnish with which the exchanger has been cov ered Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 6 Condensing heat exchanger EX Function The return water flows through the condensing heat ex changer A in Fig 12 and Fig 13 By reducing the combustion products temperature the latent heat of the vapour is transferred to the water cir cuit allowing an extra gain of useful heat The condensed vapour is then drained through the condensate trap B and the draining pipe C wW Fig 12 GE Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the case panels and the sealed chamber lid see section 2 2 Empty the primary circuit of the boiler 3 Remove the fan D in Fig 13 see section 17 3 and the air pressure switch E see section 17 5 4 Remove the flue temperature probe NTC F see section 20 3 10 5 Completely loosen the connection G and slightly move the pipe H upwards 6 Remove the clip and move the pipe J down wards freeing it from the connection then turn it towards right 7 Using pliers remove the spring K moving it
15. of Fig 26 idle position Fig 24 3 Open the plug E levering the hooks F with the help of a screwdriver Q 6 Pull up and remove the diverter group 7 Refer to the exploded view in Fig 27 to remove the internal parts of the three way diverter valve Fig 25 4 Disconnect the connectors G of the electric actuator freeing this from the plastic group Fig 25 1 5 Reassemble the actuator carrying out the re moval operations in the reverse order Fig 27 When reassembling the actuator group refer to Fig 22 or to the wiring diagram in section 3 1 for the correct wiring connection removal operations in the reverse order Pay attention to match the actuator B Fig 24 When aerial ces beat ea ea atten with the locating tab H Fig 26 tion to mount it in idle position Fig 26 Warning to lubricate the O ring gaskets EX Removal of the diverter group and its exclusively use a silicone base grease internal parts compatible to be in contact with foods and 1 Remove the front and both side case panels approved by the local water Authorities 14 8 Reassemble the diverter group carrying out the 10 Electronic control ignition p c b HAN Function Fig 28 Inlet Information On the Electronic control ignition p C b Function control C h temperature adjustment D h w temperature adjustment Boiler reset button control panel fascia From other
16. p c b EDXEE ignition and control sequence YES Ignition request lock memorised cancels lock NO Air pressure switch at YES rest Y j NO Air pressure switch at YES work Y beginning of wait period NO presence of flame YES L NO Air pressure switch at work YES starts ignition discharges opens gas valve beginning of ignition period NO flame presence YES closes gas valve d of igniti stops fan ene aa lon interrupts ignition discharges peroo memorizes lock turns on lock out light interrupts ignition discharges gas valve open NO reset push button YES pressed YES Fig 52 Air pressure switch at work A YES flame presence NO gt NO Safety thermostat YES opens the circuit NO 23 11 Modulating gas valve HA Function The Modulating gas valve A in Fig 53 controls the gas inflow to the boiler burner I sy Fig 53 By means of an electric command given to the on off operators the passage of the gas through the Modula ting gas valve can be opened or closed By means ofan electric command given to the modula tion operator the pressure can be varied and therefore the gas flow rate to the burner modulation The mo dulation operator has mechanical components which allow the adjustment of the minimum an
17. removal of the venturi device NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the fan section 17 3 2 Remove the venturi device by unscrewing the screw H 33 Fan and Air pressure switch 3 4 Fig 83 34 Inspect the venturi device B and the connection pipe Ensure they are clean Re assemble the parts in reverse order of re moval Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual Removal of the Air pressure switch NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove all the case panels and the sealed chamber lid Disconnect the wires from the Air pressure switch Remove the pipe from the Air pressure switch Unscrew the screws which hold the Air pressure switch to the frame Assemble the Air pressure switch carrying out the removal operations in reverse sequence Warning to correctly connect the Air pressure switch refer to Fig 82 and Fig 79 for the correct wiring Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 18 Ignition and detectio
18. starting defects With the boiler off remove the front case panel Remove the air release plug from the pump Start the boiler and with a screwdriver turn the rotor in the direc tion ofthe arrow Ifthere is a defect in starting the rotor Mm Check that the impeller is integral with the rotor With the boiler off remove the front and right hand side case panels lower the control panel and empty the pri mary circuit Remove the pump head by undoing the screws which hold it to the pump body and check that the impeller is firmly joined to the rotor EEN Removal Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the front and right hand side case panels Empty the primary circuit of the boiler Extract and lower the control panel Disconnect the connector B Fig 19 Loosen the connection C and pull up and turn to the left the pipe D OQ OQ N be j Fig 19 6 Remove the locking plate E Fig 20 7 Unscrew the two screws F that hold the pump on the frame and remove the pump NW Fig 20 Reassemble the pump carrying out the removal oper ations in the reverse order When reassembling the pump check the correct location of the O ring gasket in the inlet port of the pump that seals the connection will begin to turn normally only starting it manually 12 between the pump and the brass group 9 Three way diverter valve
19. the help of a screwdriver 4 To remove the filter from the flow switch group separate the filter 6 from the body 4 Fig 70 by levering it 5 Reassemble the parts following the removing se quence in reverse order 29 15 Temperature probe HAH Function The Temperature probe has the function of converting the temperature of the water in the hydraulic circuit where it is installed into an electrical signal resistance The relation between temperature and electrical resis tance is stated in Fig 71 Q 12500 12000 11500 11000 10500 10000 9500 9000 8500 8000 7500 7000 6500 6000 5500 5000 4500 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 C Fig 71 On the boiler there are two Temperature probes One on the output of the primary heat exchanger c h Tem perature probe A in Fig 72 and Fig 73 one on the out put of the d h w heat exchanger d h w Temperature probe B in Fig 72 and Fig 73 gt Jy c h c h d h w d h w return flow inlet outlet Fig 72 30 KEY Checks Temperature resistance relationship NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Disconnect the cable from the Temperature probe Measure the temperature of the brass group where the Temperature probe is located and check the electrical resistance according to the graph in Fig 71 K
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21. B Fig 16 which hold the exchanger to the brass groups Fig 16 4 Move the exchanger towards the rear of the boiler and extract it Reassemble the d h w heat exchanger carrying out the removal operations in the reverse order Attention When reassembling the exchanger be sure to put the off center location securing pin indi cated in Fig 17 towards the left side of the boiler Fig 17 11 8 Pump EXI Function The pump A in Fig 18 and Fig 19 has the function of making the water in the main circuit circulate through the main heat exchanger the condensing heat ex changer and therefore through the c h system during the c h function or through the secondary heat ex changer during the d h w function es Fig 18 EX Checks Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component Mm Check that the pump is not seized and that the movement of the rotor is not subject to mechanical im pediments With the boiler off remove the front panel Remove the air release plug of the pump and turn the rotor with a screwdriver Mm Check the electrical continuity With the boiler off remove the front panel and discon nect the connector B Fig 19 Measure the electrical resistance between the pump supply connections Electrical resistance of the windings at ambient tem perature must be about 230 Q 4 Check the absence of
22. EEN Removal of the c h Temperature probe Ns Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the sealed chamber lid 2 Empty the primary circuit of the boiler 3 Remove the electric connector C ofthe c h Tem perature probe Fig 73 4 Remove the fork D and remove the c h Tempera ture probe from the plastic group Fig 73 5 Reassemble the c h Temperature probe carrying out the removal operations in reverse order EX Removal of the d h w Temperature probe NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the front panel of the case Empty the d h w circuit of the boiler Remove the electric connector E Fig 73 Remove the fork F and remove the d h w Tem perature probe from the plastic group Fig 73 5 Reassemble the d h w Temperature probe carry ing out the removal operations in reverse order Q N Warning to lubricate the O ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities 16 By pass valve 1 Remove all the case panels 2 Empty the primary circuit of the boiler Function 16 1 eae 3 Remove the fork B and pull out the by pass pipe The By pass valve A in Fig 74 is located between the C Fig 75 c h water flow and return and its function is t
23. Fig 57 3 Turn off the gas supply and disconnect the gas isolation cock connector from the inlet port of the gas valve 4 Unscrew the connectors F and remove the pipe G 5 Unscrew the screws H and remove the valve 6 Reassemble the valve carrying out the removal operations in reverse order After any service operation on the components of the gas circuit check all the connections for gas leaks Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual Fig 57 25 12 Primary circuit flow switch EAH Function The Primary circuit flow switch A in Fig 58 function is to detect water flowrate through the primary hydraulic circuit of the boiler N Fig 58 This hydraulic membrane operated electrical micro switch device will control the functioning of the ignition control circuit providing there is an adequate quantity and flow of water in the primary circuit Any failure of the pump or obstructions in the primary circuit whilst in either c h or d h w modes will not allow the device to operate This device is connected to the electronic control p c b and if after the pump operates it does not activate with in 20 seconds the control board will indicate that a fault condition see section 10 4 of this manual has oc curred IEEJ C
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25. ans of the signal coming from the air pressure switch The Electronic control ignition p c b has a safety func tion and any incorrect interventions or tampering can result in conditions of dangerous functioning of the boiler The Electronic control ignition p c b can lock the func tioning of the boiler lock state and stop its functioning up to the resetting intervention The lock is signalled by the lighting of the lock out signal lamp and the device can be reset only by using the boiler reset button placed on the control panel fascia Some components which are connected to the device can activate the lock state The causes of a lock state could be The intervention of the safety thermostat over heat of the primary circuit The intervention of the flue temperature probe overheat of the combustion products A fault on gas supply Faulty ignition faulty ignition electrodes their wir ing or connection Faulty flame detection faulty detection electrode its wiring or connection Faulty condensate drainage Gas injectors blocked Faulty modulation gas valve faulty on off oper ators or not electrically supplied Faulty Electronic control ignition p c b EG OY OA O O Other components like the air pressure switch can tem porarily stop the ignition of the burner but allow its igni tion when the cause of the intervention has stopped Fig 52 shows the sequence of the operations that are carried ou
26. burner and at the end locks the boiler and lights the lock out signal lamp Fig 87 EJ Checks 1 Overheat temperature value 1 Set the temperature control knobs to their max position and run the boiler in d h w and c h 2 Allow the boiler to reach its maximum operating temperature monitor the temperature gauge on the instrument panel The boiler should maintain a temperature below that of the safety thermostat and no overheat intervention should occur NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 4 Electrical function Remove all the case panels and the lid of the sealed chamber _ 36 2 Remove the screws B and the plate C Fig 88 3 Disconnect the safety thermostat and check its electrical function Normally no intervention the contact must be closed electrical resistance zero Q KEEN Removal Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the lid of the sealed chamber 2 Remove the screw B and the plate C Fig 88 Fig 88 3 Disconnect the wiring D detail in Fig 89 4 Remove the spring E which holds the overheat thermostat on the pipe of the primary heat ex changer and remove it SN AA lt ms HAZ 0 Fi
27. by mode or during the normal operation of the boiler The following table gives the relationship between the lamp indication and its meaning Electronic control ignition p c b Boiler in stand by condition function control in O position Anti freeze system active Boiler ON condition function control in ag or He position 1 second ON 1 second OFF With the boiler switched ON X or all the lamps 10 in Fig 29 are activated The following table gives the relationship between each of the possible lamp combinations and their meaning m DU 000 Normally operating boiler O O see the previous table for details D h w operation O O res Excessive temperature on primary circuit O O i Faulty c h temperature probe NTC Faulty d h w temperature probe NTC Faulty flue temperature probe NTG SERGI Faulty primary circuit 28 no water or absence of flow XO Faulty air pressure switch SN Lack of burner ignition no ignition signal from O e O the full seqence ignition device O O oO Safety thermostat lock out Flue temperature probe NTC lock out Lack of power supply or fauly electronic control p c b Faulty Electronic control ignition p c b Flashing lamp alone Flashing lamp or simultaneously alternate with with an other lamp another lamp Lamp Lamp OFF ON These conditions are normal only for a short time when the power supply is applied to the boiler I
28. d maximum pressure exiting the valve ERE Nomenclature of the parts Fig 54 Minimum gas pressure adjustment Maximum gas pressure adjustment Modulation operator s electric connectors On off operators electric connector On off operators Gas valve inlet pressure test point Gas valve outlet pressure test point Modulation operator AN Oa G NN 24 Fig 54 HEN Adjustment NN Warning isolate the boiler from the mains electricity supply before covering or component removing any Remove the front panel of the case 2 Open the gas valve inlet pressure test point 6 in Fig 54 at the valve input connect a suitable pressure gauge and check the gas pressure of the supply network 3 Remove the gauge and close the pressure test point 6 4 Open the gas valve outlet pressure test point 7 in Fig 54 and connect the gauge 5 Remove the protection cap B Fig 55 from the mechanical pressure adjustment components levering with a flat screwdriver in the slots C Modulating gas valve 6 Start the boiler at its maximum power Operate the boiler in d h w mode or ensure that the boiler is not range rated if the testis carried out in c h mode 7 Rotate the maximum gas pressure adjustment 2 in Fig 54 until you obtain the required pressure by rotating clockwise the pressure increases 8 Turn the boiler off and disconnect one of the two connectors 3 in Fig 54 9 Start the boiler and rotate the minimu
29. down wards and disconnect the rubber pipe L 8 Remove the bracket M by unscrewing the screws that hold it on the frame 9 Rotate the exchanger as indicated by the arrow and remove it towards the front of the boiler 10 Remove the clip N and the pipe H F _ BJ E MEME EE PW Fig 13 11 Reassemble the exchanger carrying out the re moval operations in reverse order After reassembling ensure that the fan exchanger and exchanger elbow gaskets are correctly mounted and ensure a good sealing Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 7 D h w heat exchanger Function The d h w heat exchanger A in Fig 14 and Fig 16 al lows the instantaneous transfer of heat from the primary hydraulic circuit to the water destined for d h w use reci Fig 14 The schematic structure is shown in Fig 15 A V A V m Primary hydraulic circuit Domestic hot water circuit Fig 15 Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the front and right hand side panels of the case 2 Empty the primary circuit and the d h w circuit of the boiler _ 3 Completely unscrew the two Allen key screws
30. e front panel To remove the front panel remove screws A Fig 2 lift the panel and remove it Fig 2 To remove the side panels loosen the screws B and C Fig 3 bring the base of the panels away from the boiler and lift them freeing them from the top hooks Fig 3 bottom view of the boiler PEN Control panel NN Warning isolate the boiler from the mains electricity supply before removing any covering or component To gain access to the parts located inside the control panel proceed as follows 1 Remove the front panel of the case 2 Loosen the screws B and C Fig 3 3 Remove the screws D 4 Move the lower part of the side panels as indi cated in Fig 4 and pull the control panel When completely pulled out the panel can rotate 45 downwards to facilitate the service oper ations on the internal parts 5 Remove the screws E and remove the service panel Fig 5 6 To gain access to the electronic regulation PCB remove the screws F and remove the control pan el lid Fig 5 Fig 5 EXI Access to the sealed chamber Fig 6 General access and emptying hydraulic circuits To gain access to the parts contained in the sealed chamber it is necessary to remove the lid of the sealed chamber For this purpose remove the front and side panels of the case re
31. ea PNOO Ueu ay jo eunyesedwis ay 9pouu y o UO wuy p yo Buimesp e Buunp u a apou y o u vorjesado Jejnbay de ay Woy Jajem poo m Hig wy p Ajddns jou saop Jajiog ay Di iO M S D2 YP orasysS T W U lt U Z3 O O uwW m 2 O0O Q Y U O O O m Q P s S slo 5 5S S 5 S 5 5 P 5 SS 8 B es 5 5 S PE 5 5 S 5 Ble ele sle 8 Fs ele Slolslolels 3 15 2 5 818 S s5 o0 lo 8 7 lola Slals s gt 8 alals Si 218 2 S 5 gt 2 lel3 3 3 5 2 os S 3ja S5 el2 lt 3 2 5 8 s s5 P 2 5 a s S 8 28 2 3 S Q lt o Do oO lt Est gt Lo 5 O l eles eis 2 ele ls Slslslelsleiels Je 3 2 2 Q 9 jo So o S o 3 13 1 2 5 o 3 2 5 lt o o on o a o oa 2 aj gt g 2 5 2 o b ollo ke c o o 2 a Q 7 gt gt 2 o o gt jo z o E a 3 D S al2l 3 D S 5 A o o A 0 o D 313 5 2 a 3 amp 3 D 3 1p jeq 8 2 r g 2 U sjoyoeJq ul J 1 lou U04 Z6L cst CLL 91 SL GVLigcl Vit 601 36 os Z bho dl lt 7 enueu ay JO Ondas y y 0 sjuauoduoo 5 Primary heat exchanger EXI Function The primary heat exchanger A in Fig 9 has the function of transferring heat produced from combustion of the gas to the water circulating in it s AAA Fig 9 The hydraulic circuit is
32. ent 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Disconnect the electrode wires from the full se quence ignition device 3 Remove the plate C see Fig 88 on page 36 4 Remove the burner by unscrewing the four screws placed at the right and left sides of the burner 5 Unscrew the screws A Fig 86 which hold the electrodes to the burner 6 Extract the electrodes from the burner 7 Assemble the electrodes carrying out the removal operation in reverse order Refer to Fig 84 in order to recognise the elec trodes and to correctly connect the wiring Note the metallic edge of the detection electrode is longer than the one of the ignition electrodes Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 35 19 Safety thermostat KAN Function The safety thermostat A in Fig 87 and Fig 88 is a de vice that senses the temperature of the primary circuit water which flows in the outlet pipe of the primary heat exchanger If the temperature control system of the boiler fails and the temperature of the primary circuit reaches a dan gerous temperature the safety thermostat opens the electric circuit that supplies the on off operators of the gas valve Consequently the full sequence ignition device at tempts to light the
33. ernative Bertelli amp Partners Elbi ELTH type 261 IMIT 39 Short spare parts list 40 17962 1362 0 4406 44A4 UK Biasi UK Ltd Newman Park Western Way Wednesbury WS10 7BJ Sales Tel No 0121 506 1340 Sales Fax No 0121 506 1360 Service Tel No 0121 506 1350 Service Fax No 0121 506 1370 www biasi co uk
34. f permanent they indicate a faulty p c b DEN Setting the boiler control function modes It is possible to select the various boiler control function modes by using the function selector knob A and the D h w temperature control knob B Fig 32 17 Electronic controllignition p c b On model M96 28SR the knob B is used just for boiler setting and doesn t affect the boiler functions during the normal operation During the function modes setting the boiler does not operate MON Reignition frequency setting Itis possible to select the minimum time that must pass between two ignitions of the burner in c h function mode 1 Turn the boiler ON positioning the function selec tor knob A as indicated in Fig 33 2 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 3 The lamps E should give the indication as in Fig 34 reignition frequency If not press the reset button repeatedly to obtain it O O were Lamp OFF LI DD HM O Lamp on Fig 34 At this step it is possible to visualize the current setting by keeping the reset button C pressed for more than 5 seconds The lamps E will flash a number of times corresponding to the setting Fig 35 4 To change the setting turn the knob B on a posi tion corresponding to the desidered delay By turning the knob B the lock out signal la
35. g 89 5 Reassemble the overheat thermostat carrying out the operations in reverse order 6 Apply an adequate quantity of heat conducting compound between the pipe and the thermostat Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 20 Fluetemperature probe NTC EA Function The Flue temperature probe NTC A in Fig 90 and Fig 91 senses the temperature of the combustion products that flow through the condensing heat ex changer A _ lt E Y Fig 90 If the temperature of the combustion products circuit reaches the limit temperature the Flue temperature probe NTC reduces the gas flow rate to the burner The temperature of the combustion products should de crease to a safe value temperature In the case that the temperature of the combustion products reaches a potentially dangerous value it stops the boiler operation It is therefore allowed the use of plastic materials for the flue outlet pipes and bends The use of kits different from the original isn t how ever allowed since the flue pipes are integral parts of the boiler If not the electronic control p c b attempts to light the burner and at the end locks the boiler and lights the lock out signal lamp Fig 91 HH
36. hat of guar 4 Remove the fork D and pull out the by pass anteeing a minimum flow across the primary heat ex changer if the circulation across the c h system is com pletely closed The By pass valve is fitted on the rear side of the div erter group AS group Fig 75 ANNARS A Sass Fig 75 5 Remove the by pass valve E Fig 76 Do Fig 74 KEEN Removal Nx Warning isolate the boiler from the mains Fig 76 electricity supply before removing any 6 Reassemble the by pass valve as illustrated in covering or component Fig 76 reversing the order of removal 31 17 Fan venturi device and Air pressure switch Function The function ofthe FanA Fig 77 and Fig 78 is to force the products of combustion through the condensing heat exchanger to the outside air via the flue system The Fan is supplied by the full sequence ignition device at the beginning of the ignition cycle Its correct functioning is controlled by means of a sys tem incorporating a built in venturi device B in Fig 83 and an Air pressure switch C Fig 77 and Fig 78 A MEN nm y 7 Y U mr x fait 1 HU E hh Checks YX Check of the fan
37. hecks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Y Mechanical function mk Remove the front panel of the case 2 Start and stop the boiler either in d h w or c h mode 3 Looking through the switch box verify the position of the shaft B referring to Fig 59 26 Boiler ON Boiler OFF Fig 59 Y Electrical check Itis possible to verify the general operation of the switch by measuring the electric resistance between the con tacts C and N C of the switch 1 Remove the switch as explained in section 12 3 2 Measure the electrical resistance between the tabs marked C and N C Fig 60 The contact must be normally open 3 Operate the switch by hand and verify that the contact is now closed do not use N C Fig 60 PEN Removal Nx Warning isolate the boiler from the mains electricity supply before removing any covering or component Removal of the switch 1 Remove the front panel of the case 2 Unscrew the screws C that holds the micro switch housing D Fig 61 3 Open the box and disconnect the switch Primary circuit flow switch Reassemble of the membrane Fig 61 1 Insertthe brass washer as in Fig 64 a and b 4 Re assemble the parts in reverse order of re 2 Insert the plastic lever H into the rubber seat J lu moval brified before by the side without the little protru Pay attention
38. led chamber closed Fan and Air pressure switch 1 Remove the caps of the pressure test points lo cated on the top of the boiler and connect a differ ential pressure gauge Fig 80 2 Switch on the boiler Fig 80 3 Compare the value on the gauge with the follow ing minimum values 110 Pa 1 1 mbar M96 28SM Removal of the Fan NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Disconnect the connectors D and the earth con nection E Fig 78 3 Disconnect the pipe which connect the venturi device to the Air pressure switch 4 Unscrew the screw F and remove the bracket G Fig 81 Fig 81 5 Remove the Fan by sliding it towards left se the arrow in Fig 81 6 Assemble the fan carrying out the removal oper ations in reverse sequence Warning Re assembling the fan ensure that the hooks around the inlet port of the fan hung correctly on the flue hood Warning to correctly connect the venturi device to the Air pressure switch refer to Fig 82 Fig 82 Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual Inspection and
39. lights E briefly blinks simultaneously At this point only the right green light flashes 13 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A MEN Ignition gas pressure adjustment 1 Turn the boiler OFF 2 Remove the front panel of the case 3 Open the gas valve outlet pressure test point 7 see section 11 2 and connect the gauge 4 Turn the boiler ON positioning the function selec tor knob A as indicated in Fig 42 M96 24SM M96 285M M96 325M or Fig 43 M96 28SR and ensure that the timer selector switch and room thermostat if fitted are set to heat demand Run the boiler in c h mode do not open any d h w tap 5 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 6 The lamps E should give the indication as in Fig 44 If not press the reset button repeatedly to obtain it O were Lamp OFF O 00 0 O Lamp on Fig 44 7 Keep pressed the reset button C for about 5 sec onds until the lock out signal lamp D is switched OFF The boiler runs in c h mode and the lamps E give the indication as in Fig 45 19 Electronic control ignition p c b uly O O SOE Where O Lamp OFF lt Flashing lamp alone O DO 000 ae or simultaneously with an other lamp Fig 45 8 Rotate the knob B on a position corresponding to an adequate ignition
40. low switch filter 29 14 1 FUNCION iaa cite ga whens 29 14 2 Description and location of parts Fig 70 29 t43 CHECKS iaa Sard Fb are esc halide wed 29 14 4 Removal ofthe sensor 29 145 Removal of the flow switch group and d h w circuit filter 29 15 Temperature probe 30 15 1 Function us sassa aa as 30 152 Checo Z a a aia 30 15 3 Removal of the c h Temperature probe 30 15 4 Removal of the d h w Temperature probe 30 16 By pass valve 31 16 1 FUNCION us ieee iam deka pe aya 31 16 2 Removal is 31 17 Fan venturi device and Air pressure Switch 32 UI FUNCION a sssi u etait dee a 32 172 gt CHECKS ia labu ka 32 17 3 Removal of the Fan 33 17 4 Inspection and removal of the venturi device 33 17 5 Removal of the Air pressure switch 34 18 Ignition and detection electrodes 35 18 1 FUNCHON ese pce eee nee eee 35 18 2 CHECKS oni s s ea daa 35 18 3 Removal ocococcccccccoccn coo 35 19 Safety thermostat 36 19 1 Function 0 0 020 A 36 19 2 CHECKS serseri ere a rea wou te 36 193 Removal 36 20 Flue temperature probe NTC 37 20 1 FUNCION meras 37 20 2 CHECKS 2 s Q aa 37 20 3 Removal 37 21 Condensate trap
41. m gas pres sure adjustment 1 in Fig 54 until you obtain the required pressure by rotating clockwise the pressure increases 10 Turn the boiler off and re connect the wire to the modulating operator 11 Start the boiler and check again the maximum gas pressure setting 12 Turn the boiler off and disconnect the gauge Important after the gas pressure checks and any adjustment operations all of the test points must be sealed and replace the adjustment protection cap UEN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Mm Check the modulation operator coil Remove the front panel of the case 2 Disconnect the connectors D Fig 57 from the modulating operator and measure the electrical resistance of the coil Its electrical resistance value must be approx 114 Q bh Mm Check the on off operators coils Remove the front panel of the case 2 Disconnect the electrical connector E Fig 57 3 Measure the electrical resistance between the connector pins of the on off operators as illus trated in Fig 56 On off operator approx 4 180 Q at ambient temperature Fig 56 HEN Removal of the gas valve NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case as explained in the section 2 3 of this manual 2 Disconnect the connectors D and E
42. move the screws G as indicated in Fig 6 and remove the lid PJ Emptying the primary circuit 1 Close the c h circuit flow and return cocks H Fig 7 Fig 7 bottom view of the boiler 2 Remove the front and right panels of the boiler 3 Open the drain tap Fig 8 until the boiler is com pletely emptied 4 Close drain tap again once the emptying has been completed Fig 8 PU Emptying the d h w circuit 5 Close the d c w inlet cock J Fig 7 6 Open one or more hot water taps until the boiler has been completely emptied 3 Diagrams EXI Wiring diagram M96 28SM C2 Electric supply External controls Three way Pump Fan Primary circuit Air pressure Ignition Flame detection terminal block terminal block diverter valve S flow switch switch electrodes electrode L N 1 M B S II aaa Condensate bk bn bu bn bu bn bu gny bn bu y bn bu gnye o o x x Q Q s lt Ny y
43. mp D blinks quickly 2 per seconds indicating that the setting has changed and must be memo rised 18 x 5 1 2 4 11 2 gt MERA 7 NS e E 81 2 A X O 00 00 bet Delay minutes Setting No 5 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 6 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A In any case the boiler automatically resets to its nor mal operation after 10 minutes Factory setting 3minutes Combi C H only mode setting Two different options are available on the Electronic control ignition p c b and proper setting must be done after a replacement of the p c b 1 Remove the front panel of the case 2 Turn ON the power supply Lamps E give the in dication as in Fig 36 O O E Where Lamp OFF L UU 00 ee Lamp Flashing Fig 36 3 Position the function selector A as in Fig 37 and disconnect the C h temperature probe 4 Keep pressed the reset button C for about 10 sec onds Fig 37 until the lock out signal lamp D blinks 5 Connect the c h temperature probe Fig 37 6 Press the reset button C repeatedly 2 times until the lamps E give the indication as in Fig 38 boiler mode were Lamp OFF O 00 HU O Lamon Fig 38 At this step it is possible to visualize the current setting by keeping the reset b
44. n electrodes HAN Function Three electrodes are fitted on the burner Two of them are the ignition electrodes and are fitted near the front part of the burner The ignition sparks take place be tween their metallic edges over the central ramp of the burner during the ignition sequence The third electrode is the detection electrode and it de tects the presence of the flame S Detection Ignition Male Fig 84 EEJ Checks Mm Check the position of the electrode edges NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Check for the correct distance between the me tallic edges of the ignition electrodes see Fig 85 4mm Ignition Fig 85 3 Check the integrity of the detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner Y Check the connection wires NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Check for the integrity of the insulation of wires which connect the electrodes to the ignition de vice KEEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or compon
45. nob half a turn and re insert the spindle Make sure that the settings comply with the in dications given in section 10 7 Operate the boiler and close the gas inlet cock so that the boiler goes into the safety lock out state Verify the correct operation of the boiler reset but ton by pressing and releasing it Warning After cleaning or replacement as detailed above if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 21 Electronic controllignition p c b EXE Thermal control in the mode Switch in the on function mode See functioning with the function control in the mode lt YES water from the domestic ho NO sec 10 12 Is primary circuit YES temperature higher than that NO selected Request for heat from room thermostat Circulator off Starts the circulator Operates motorised valve Operates motorised valve Ignition device off Supplies the ignition device Fig 50 EAH Thermal control in the 3 mode Switch in the X function mode YES Circulator off NO gt Ignition device off water from the domestic ho Y Circulator on Is domestic hot water outlet temperature lower than that required YES NO o Supplies the ignition device Ignition device off Fig 51 22 Electronic controllignition
46. oltage section Transformer x Three way diverter valve y1 2 Full sequence ignition device Electronic control p c b J3 3 Three way diverter valve J1 2 Full sequence ignition device Diagrams EEN Circuit voltages during c h or d h w operation Electrical voltages with burner on C gt only during c h operation GO only during d h w operation Pump N 3 way 8 Fan diverter valve Modulating 4 Gas valve q Supply network 230 230 K3 K4 f K2 X4 Q Q LD3 LD2 LD1 LD4 SB1 Air a afety switch thermostat pressure uonouni m y p uo uonle19do BLUON yO UO lIUA HOUS e 104 s1yBi lloq ayl y 9 uo ppoaJlo9 s do Jajloq ayl awe ey JO uonelnpoui ay UO y 1 usey qouy juewjsnipe dwa m y p ay Buin a1njeladuea M Y P ay Ionuoo 1 us op Jejloq ay 1 uin1 US9Op UR pouu M y p JO y 9 Ul Jeyye 1461 1 Useop aunq ay suJn Ue pouu M y p JO y 9 Ul JOULE 1461 1 Useop aunq ay Ins Uey 440 s1uB1 uoyesedo au IIV apou m y p JO y o ul JOYE Hes JOU seop Ja loq ay urebe SOO
47. ponent 5 Remove the front and right case panels Disconnect the trap from the draining pipe 7 Using pliers remove the spring D moving it up wards 8 Remove the spring E and lower the trap 9 Disconnect the wirings from the trap 10 Reassemble carrying out the removal operations in reverse order o Fig 92 The condensate trap is provided with two electrodes The electrode B is connected to the ground circuit the electrode C is connected to the flame detecting elec trode Fig 93 Fig 94 38 22 Shortspare parts list Key G C part no Description Q ty Manufac Manufacturer s reference turer part no 1 173 148 Burner mod M96 24SM KI1004 102 Polidoro 173 149 Burner mod M96 28SM M96 32SM KI1004 147 169 069 Injectors for natural gas mod M96 24SM KI1064 505 Polidoro Injectors for natural gas 14 mod M96 28SM M96 28SR 32SM E01 156 Injectors for LPG mod M96 24SM F BI1003 509 Injectors for LPG mod M96 28SM M96 28SR M96 32SM 3 E83 121 Expansion vessel BI1172 103 CIMM 6 litres 4 H20 984 Main heat exchanger mod M96 24SM 1 Bl1262 101 H20 985 Main heat exchanger 1 Bl1262 102 mod M96 28SM M96 28SR Main heat exchanger mod M96 32SM BI1262 130 H21 048 Fan mod M96 24SM BI1406 100 H21 049 Fan mod 1 BI1406 101 M96 28SM M96 28SR M96 32SM Air p
48. pressure Refer to the value indicated in the tables of the User Installation manual Technical information section Gas pressures at the burner table By rotating clockwise the pressure increases 9 Make a note of the position of the knob B 10 Turn the boiler OFF and ON positioning the func tion selector knob A as indicated in Fig 46 11 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 12 Press the reset button C repeatedly 4 times until the lamps E give the indication as in Fig 47 igni tion pressure adjustment mode O were Lamp OFF O 00 M Lamon Fig 47 13 Turn the knob B to the minimum fully counter clockwise and then on the position correspon ding to the position obtained on step 8 By turning the knob B the lock out signal lamp D blinks quickly 2 per second indicating that the setting has changed and must be memorised 14 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 15 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A checking the ignition pressure and that the burner lights up uniformly In any case the boiler automatically resets to its normal operation after 10 minutes HAJ Checks Mm Check that the fuses are complete If the Electronic control ignition p c b does not supply any device pump fan
49. ressure switch 0 88 0 74 mbar mod M96 24SM M96 32SM H08 605 Air pressure switch 1 38 1 25 mbar mod M96 28SM 8 E83 013 Safety valve E83 178 Combustion chamber side panels Combustion o rear panel mod M96 24SM Combustion am rear panel M96 28SR E83 180 E83 181 mod M96 28SM M96 28SR M96 32SM Combustion pied front panel mod M96 24SM Combustion am front panel mod M96 28SM M96 28SR Electronic regulation p c b M96 32SM E01 204 D h w heat exchanger M96 24SM D h w heat exchanger M96 28SM M96 32SM Dhaka E83 101 Overheat thermostat gt Flue temperature probe NTC Fuse 3 15 AF E01 205 E83 126 Ignition electrode right E83 122 Detection electrode E83 145 AIE 164 026 Temperature probe main or d h w circuit 23 E83 127 Ignition electrode left Temperature pressure gauge KI1267 103 BI1376 104 BI1131 100 2 BI1326 100 E Bl1326 107 Bl1326 108 aa BI1406 118 Bl1406 119 e BI1715 105 1 BI1001 101 BI1001 102 BI1262 103 bae Bl1291 107 KI1042 107 EEN Bl1291 115 aa Bl1291 109 BI1172 105 pe BI1342 100 BI1295 108 KI1042 501 BI1123 101 BI1123 103 BI1123 102 BI1475 108 BI1262 122 Yamatake Honeywell C6065 SIT 380 alternative Yamatake Honeywell C6065 SIT 380 alternative Watts Orkly alt
50. t at the start of every ignition cycle and during normal functioning YN Selection and adjustment devices On the Electronic control ignition p c b several selec tion adjustment and protection devices are located Fig 29 15 Electronic controllignition p c b Some of these devices are directly accessible by the user function control temperature adjustment poten tiometers etc others are accessible by removing the service panel or the control panel lid x1 connector x6 connector x7 connector x4 connector x2 connector Lock out signal lamp Boiler reset button Function control C h temperature adjustment D h w temperature adjustment 10 Appliance operation lights 11 Fuse3 15AF EXE Checking the temperature The Electronic control ignition p c b makes it possible to separately adjust the c h water flow temperature and d h w outlet temperature The temperature of the water is converted into an elec tric signal by means of temperature probes The user setting the desired temperature with the con trol panel knobs operates the variable elements 8 and 9 in Fig 29 of the electronic control p c b If the power requested is lower than 40 of the maxi mum power output then control is achieved by switch ing ON the burner at minimum power then switching OFF ON OFF function If the power requested is higher then the burner is switched ON at maximum power and will control by modulating to 40 of the
51. to pull the lever E Fig 59 to the left sion K until this touch the surface of the rubber before inserting the new switch seat as in Fig 64 b Refer to Fig 60 for the correct wiring connectors on the switch Warning to lubricate the O ring gaskets exclusively use a silicone base grease gt Removal of the membrane compatible to be in contact with foods and approved by the local water Authorities 1 Remove the front and right hand side panels of the case turn off the flow and return isolation valves and empty the primary circuit 2 Remove the switch as explained before f 3 Insert the rubber seat J with the lever inserted 3 Unscrewthe four screws F see Fig 63 and open through the rubber ring L asin Fig 64 c and d the hydraulic operator When assembling the membrane ensure that its 4 Remove the membrane G pulling out the plastic concave side faces towards the actuator plate M lever H from her and removing the brass washer and the reference indicated aligns with the seat N I see NO TAG 27 Primary circuit flow switch 13 Expansion vessel and temperature pressure gauge REX Function The Expansion vessel O in Fig 58 function is to allow for the volume expansion of the c h circuit water due to the temperature rise REP Checks 1 Turn off the flow and return isolation valves and empty the primary circuit of the boiler 2 Remove the protective cap P Fig 65 from the valve on the
52. top of the expansion vessel and con nect a suitable air pressure gauge Fig 65 3 Check the pre load pressure and refer to the section Expansion vessel in the User manual and installation instructions for the correct value KEEN Removal of the expansion vessel If there is at least 400 mm clearance above the boiler and the rear exit flue can be easily removed the expan sion vessel can be changed without removing the boiler NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front and left hand side panels of the case turn off the flow and return isolation valves and empty the primary circuit 28 2 Completely unscrew the connection Q the lock nut R Fig 66 and remove the expansion vessel from the top of the boiler Fig 66 3 Re assemble the parts in reverse order of re moval REZ Removal of the temperature pressure gauge 1 Remove the front and right hand side panels of the case turn off the flow and return isolation valves and empty the primary circuit 2 Remove the fork S and the probe holder spring T Fig 67 3 Squeeze the tabs U to release the temperature pressure gauge V and remove it 4 Re assemble the parts in reverse order of re moval 14 D h w flow switch filter ESN Function The d h w flow switch A in Fig 68 is a device that gen erates an electrical signal when hot water is drawn
53. utton C pressed for more than 5 seconds The lamps E will flash a number of times corresponding to the setting Fig 39 M96 28SR 4 flashes M96 24SM M96 28SM 1 flash l B omw amp Fig 39 7 To change the setting turn the knob B on a posi tion corresponding to the boiler models Fig 39 By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indicating that the setting has changed and must be memo rised 8 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 9 Press the reset button C once until the lamps E give the indication as in Fig 40 boiler mode O O Where Lamp OFF O DU HU Lamon Fig 40 It s now possible to check the current setting by pres sing reset button C for more than 5 seconds The three lamps E will flash a number of times corresponding to the setting as in Fig 41 once for the combination and four times for system boilers At this point only the right green light flashes Fig 41 10 Turn the water control to minimum Lock out lamp blinks 2 per second indicating the setting has changed Electronic controllignition p c b 11 To change the setting turn the knob B on a posi tion corresponding to the boiler model Fig 41 12 To memorize the setting keep pressed the reset button C for about 5 seconds until the

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