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1. PT 6 fa gnye 222 gnye e E I N S DM Condensate w a AE M gy 9 RS bn e rd 5 aN i gt 1155333113 pay b gt x fo Electronic 9 et bn 5 control p c b PEEB er bu e bk 9 O Dom bu 97 bk k ol rd A U Full sequence ignition device bk bk D h w temperature _ D h w flow Primary circuit Ch temperature v probe NTC switch flow switch probe NTC Modulating gas Three way Pump diverter valve bn brown bu blue bk black wh white rd red Solon Time switch vt violet orange gnye green yellow Diagrams Wiring diagram for boiler equiped with full sequence ignition device type Honeywell FPLD Flame detection electrode2. Fig 55 3 Re assemble the parts in reverse order of re moval 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 M and the probe holder spring N Fig 56 3 Squeeze the tabs to release the temperature pressure gauge P and remove it 4 Re assemble the parts in reverse order of re moval 90 Fig 56 15 D h w flow switch filter and flow limiter Function The d h w flow switch A in Fig 57 is a device that gener ates an electrical signal when hot water is drawn RSS Fig 57 When the flow rate through the d h w circuit reaches about 2 5 litres min the float 4 Fig 59 is drawn to wards the right The resulting magnetic field of ring 3 increases and re aches the flow switch sensor 1 The sensor generates an electrical signal that switches the boiler d h w operation ON The state ofthe sensor is also indicated by means ofthe lamp B placed on the sensor body Fig 58 Nomenclature and location of parts Fig 59 Flow switch sensor Plug Magnetic ring Float Spring Filter Body Spring seat Flow limiter M96 28SM optional accessory O Threaded ring OMAN OO
3. Condensate trap External controls Electric supply Flue Safety Fan Air pressigaition terminal block terminal block thermostat thermostat switatlectrodes bu br br br NI 22 C 555 dgnye F 2 e J BN bk Je 02 v bu H Gei e 5 Ile GIE BFE iM o gt 5 l gt x A Electronic lt 52 L ttre et b lel control p c b ek bu e AE ba te 09 f bk a 07 le bu bu n JUI Full sequence x ignition device d d ce 2 rd wh 7 M rd bk bk bu bk DHW temperature DHW flow Primary circuit CH temperature probe NTC switch flow switch probe NTC Three way Pad diverter valve Pump bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow Modulating gas valve Time switch Diagrams Functional flow diagrams General layout J1 1 Fuse 1 6A T PTC Electronic control p c b low voltage section Transformer PA gt A 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
4. EES EE EE CES L Fig 18 Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 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 Check the electrical continuity With the boiler off remove the front panel and discon nect the connector B Fig 20 Measure the electrical resistance between the pump supply connections Electrical resistance of the windings at ambient tem perature must be about 230 Q Check the absence of 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 of the arrow If there is a defect in starting the rotor will begin to turn normally only starting it manually 14 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 Removal NN Warning isolate the boiler from the mains electricity suppl
5. low voltage section Transformer 2 J3 5 m 1 J3 4 1 M TSH ES Three way diverter valve 01 2 Ka N ted 43 1 fex J8 2 uc J2 5 J2 4 H H G D Full sequence ignition device Electronic control p c b low voltage section Transformer 2 M J3 3 Three way diverter valve Full sequence ignition device Electronic control p c b J3 3 Three way diverter valve Full sequence ignition device Circuit voltages Diagrams Diagrams for boiler equiped with full sequence ignition device type Bertelli amp Partners FM30 Electrical voltages with burner on during c h or d h w operation only during c h operation only during d h w operation Supply network E 00 L A 230 o He 230 o JL o EE Ww Modulating Gas valve Safety thermostat Fan 230 Air pressure switch Electronic control p c b 230
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7. intervention of the safety thermostat over heat of the primary circuit 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 Gas injectors blocked Faulty modulation gas valve faulty on off oper ators or not electrically supplied Faulty Full sequence ignition device 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 43 shows the sequence of the operations that are carried out at the start of every ignition cycle and during normal functioning Checks Lock sequence Start the boiler until the burner is ignited O O With the burner firing interrupt the gas supply The Full sequence ignition device must carry out a complete ignition cycle and then stop 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 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 Removal NA Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Gain access to the parts located inside the con
8. 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 function and in func tion are illustrated in detail in sections 10 10 and 10 11 Operation lights The Electronic control p c b is provided with three lamps L E D indicators 7 in Fig 29 that give optical in formation during the operation of the boiler The green lamp on the left gives information whether the boiler is in stand 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 p c b Boiler in stand by condition function control in position Anti freeze system active Boiler ON condition function control ml or position 1 second ON 1 second OFF With the boiler switched ON 9 or 8 all the lamps 7 in Fig 29 are activated The following table gives the relationship between each of the possible lamp combinations and their meaning Normally operating boiler ARS see the previous table
9. 1 To remove the Temperature probes remove the front panel of the case 2 To remove the c h Temperature probe empty the primary circuit of the boiler To remove the d h w Temperature probe empty the d h w circuit of the boiler 3 Remove the electric connector of the Tempera ture probe and unscrew it 4 Reassemble the Temperature probe carrying out the removal operations in reverse order 31 17 By pass valve Removal Function w Warning isolate the boiler from the mains The By pass valve A in Fig 65 is located between the electricity supply before removing any c h water flow and return and its function is that of guar covering or component anteeing a minimum flow across the primary heat ex changer ifthe circulation across the c h system is com 1 Remove all the case panels pletely closed 2 Empty the primary circuit of the boiler The By pass valve is fitted on the rear side of the div erter group Remove the diverter group as described in the section 9 4 of this manual 4 Unscrew the connector B and remove the by pass valve C Fig 66 Fig 66 5 Reassemble the by pass valve as illustrated in Fig 65 Fig 66 reversing the order of removal 32 18 Fan venturi device and Air pressure switch Function The function of the FanA Fig 67 and Fig 68 is to force the products of combustion trough the condensing heat exchanger to the ou
10. RISC on the Electronic control p c b must be set fully counter clockwise Fig 37 Ignition gas pressure adjustment By using the device 10 Fig 29 marked ACC on the Electronic control p c b it is possible to adjust the gas pressure at the injectors in the ignition phase This pressure is maintained at the injectors until ignition occurs ionization signal from the full sequence ignition device To carry out the adjustment move the function selector 3 to the OFF position Fig 34 and use the adjustment device 10 ACC Adjustthe gas pressure atthe injectors tothe value indi cated in the tables of the User Installation manual Technical information section Gas pressures at the burner table By rotating the device clockwise the pressure in creases Check the regular ignition of the burner by turning the boiler on and off repeatedly After the adjustment operations bring the selector 3 back to the normal position ON 20 ITE Checks Check that the fuse is complete If the Electronic control p c b does not supply any de vice pump fan etc check that the fuse 12 Fig 29 is complete If the fuse has blown replace it with one that has the same characteristics after having identified the reason for failure Check the setting jumpers position Two setting jumpers must be fitted on the Electronic control p c b as shown in Fig 36 IDE Removal of the electronic contr
11. 13 ees 14 Function s eran eR 14 CHECKS toI RAE 14 Removal 14 Three way diverter valve 15 FUNCION ia cate ees won rede ERI nes 15 CHECKS DICIS 15 Removal of the electric actuator 15 Removal of the diverter group and its internal parts 16 Electronic control p c b 17 F fictlor secre 17 Selection and adjustment devices 17 Checking the temperature 17 Operation lights 18 Dip switch selectors 19 Settinds cii en eniier eee Pe AW Ep es 20 Ignition gas pressure adjustment 20 GHOGCKS 2 50 tr tede ies 20 Removal of the electronic control p c b 20 Thermal control in the d mode 22 Thermal control in the ig mode 22 Full sequence ignition device 23 PUPICHOM scsi occa aie etalon ena ook p 23 Checks A n SA pde wad Ep es 23 Removal 23 Ignition and control sequence 24 12 12 1 12 2 12 3 12 4 12 5 12 6 13 1 18 1 18 2 18 3 18 4 18 5 19 19 1 19 2 19 3 20 20 1 20 2 20 3 21 2141 21 3 22 22 1 22 2 23 Modulating gas valve 25 FUPICTION 52 Se IE 25 Nomenclature of the parts 25 Adjustment 25 bere 26 Removal of the on off operators coils 26 Removal of t
12. 230 230 3 way diverter valve Pump Full sequence Ignition device Electronic control p c b Diagrams Diagrams for boiler equiped with full sequence ignition device type Honeywell FPLD Electrical voltages with burner on e during c h or d h w operation only during c h operation only during d h w operation x c gt 5 o JC 230 QO as SD Hung 230 230 E JoL Modulating Gas valve 0 Laer Safety thermostat Fan 230 Air pressure switch 0 0 Electronic EE control p c b 230 Q 3 way diverter valve Pump Full sequence Ignition device Electronic control p c b UONOUN Wu p UO wo UO HOUS e JO
13. 7 D h w heat exchanger Removal Function NN Warning isolate the boiler from the mains electricity supply before removing any The d h w heat exchanger A in Fig 14 and Fig 16 al covering or component lows the instantaneous transfer of heatfrom the primary hydraulic circuit to the water destined for d h w use ch Remove the front and right hand side panels of the case t Ee 2 Empty the primary circuit and the d h w circuit of the boiler 3 Completely unscrew the two Allen key screws B Fig 16 which hold the exchanger to the brass groups 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 ig 14 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 The schematic structure is shown in Fig 15 A V Primary hydraulic circuit Domestic hot water circuit Fig 15 Fig 17 13 8 Pump Function The pump 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 ee
14. Wall hung fan flue room sealed high efficiency gas boiler Service manual GARDA HE Models G C Appl No M96 24SM B 47 970 25 96 285 47 970 26 GARDA HE SILVER Models G C Appl No M96 24SM D 47 970 27 M96 28SM D 47 970 28 Leave this manual adjacent to the gas meter BIASI 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 11 11 11 1 11 2 11 3 11 4 Overall information 1 Overall View 1 Hydraulic diagram 1 General access and emptying hydraulic 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 EN hed eae alae lene 4 Wiring diagram 4 Functional flow diagrams 6 Circuit voltages 7 Fault finding 9 Primary heat exchanger 11 E rictlon a a ms 11 Removal 11 Cleaning 11 Condensing heat exchanger 12 ee pb 12 Removal 12 D h w heat exchanger 13 F ngctlori ours este 13 Removal
15. and must be correctly coupled with the spindle of the float 4 To determine the correct orientation of the ring proceed as follows 1 Set the function selector of the boiler in stand by mode Fig 60 GER 000 Fig 60 2 Restore the mains electricity supply to the boiler Waring ensure that all the electric parts and wirings are dry and do not touch other not mentioned electric parts during the following operations 3 Hold the flow switch sensor 1 and bring the ring in touch with the sensor as illustrated in Fig 61 4 Observe the lamp B placed on the sensor body that should light If not reverse the ring and repeat the previous operation 30 5 Fit the ring on the spindle of the float in the way that lights the lamp B 6 Isolate the boiler from the mains electricity supply and reassemble the parts following the removing sequence in reverse order Fig 61 Flow limiter The M96 24SM model is factory fitted with a 10 litre min flow limiter If on the M96 28SM model the flow rate of the d h w circuit is too high it is possible to limit it by installing a flow limiter The following sizes are available Nominal flow rate litres min To install the flow limiter 1 Remove the flow switch group as explained in the section 15 5 2 Unscrew the threaded ring 10 Fig 59 and re move it from the body 7 3 Install the flow limiter 9 putting its smaller d
16. q o d 1 eouenbes 08 E mee uonoejeq uous U91IMS ainsseid pue eqoud due wug D syayOeJQ e1ou enueui y jo uonoeg E _ n a viono m x Ed o 2 lt 5 o lt LN S lt 3 D lt 5 E Ssed g 8 01 epe m sjueuoduuo2 5 Primary heat exchanger ES 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 SS Fig 9 The hydraulic circuit is composed of 8 elliptical pipes connected in parallel Fig 10 Fig 10 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
17. sure of the contact between the boiler reset but ton B and the tab C Fig 39 Fig 39 Attention After installing the Electronic control p c b 10 sure the c h 6m and d h w 8224 tem perature adjustment knobs can move freely for the complete range If not remove the spindle again as described at step turn the knob half a turn and re insert the spindle Make sure that the settings comply with the in dications given in section 10 6 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 control p c b Thermal control in the amp mode Switch in function mode See functioning with the function control in the mode lt YES sec 10 11 NO Is primary circuit temperature higher than that selected YES NO Request for heat from room thermostat WW _ Circulator off Starts the circulator Operates motorised valve Operates motorised valve Ignition device off Supplies the ignition device Fig 40 Thermal contro in the Pl mode Switch in the
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19. B and the draining pipe C A Fig 12 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 18 3 and the air pressure switch E see section 18 5 4 Remove the flue thermostat F see section 21 3 5 Completely loosen the connection G and slightly move the pipe 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 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 O DN 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 12
20. P Go MM Fig 59 Checks NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Flow switch sensor operation Remove the front panel of the case 2 Switch on the boiler and open a d h w tap The lamp B Fig 58 placed on the sensor body is Switched on when the flow rate reaches about 2 5 litres min Removal of the flow switch 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 connector C Fig 58 and remove the sensor by pulling it towards the front of the boiler the sensor is held in place by means of a spring Removal of the flow switch group and d h w circuit filter NA 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 29 D h w flow switch filter and flow limiter 2 Remove the flow switch sensor see section 15 4 3 Remove the gas valve see section 12 6 4 Unscrew the plug 2 Fig 59 and extract the flow switch group 5 To remove the filter from the flow switch group separate the body 7 from the plug 2 Fig 59 by unscrewing it 6 Reassemble the parts following the removing se quence in reverse order Attention the ring 3 Fig 59 has a magnetic polarity
21. combustion chamber lid 2 Check for the correct distance between the me tallic edges of the ignition electrodes see Fig 75 MN Ignition C Fig 75 36 3 Check the integrity of the detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner 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 Removal 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 electrode wires from the full se quence ignition device 3 Remove the plate C see Fig 78 on page 37 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 76 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 74 in order to recognise the elec trodes and to correctly connect the wiring Note the metallic edge of the detection electrode is longer than
22. switch Fig 53 4 Reassemble the parts in reverse order of removal When assembling the membrane ensure that its concave side faces towards the actuator plate G and the reference indicated aligns with the seat H see Fig 53 14 Expansion vessel and temperature pressure gauge Function The Expansion vessel in Fig 49 function is to allow for the volume expansion of the c h circuit water due to the temperature rise Checks 1 Turn off the flow and return isolation valves and empty the primary circuit of the boiler 2 Remove the protective cap J Fig 54 from the valve on the top of the expansion vessel and con nect a suitable air pressure gauge Fig 54 3 Check the pre load pressure and refer to the section Expansion vessel in the User manual and installation instructions for the correct value 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 28 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 2 Completely unscrew the connection K the lock nut L Fig 55 and remove the expansion vessel from the top of the boiler U
23. thermostat J It is not necessary to disconnect it from the wiring 7 Loosen the connection K and move the pipe L downwards freeing it from the connection of the primary 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 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 11 6 Condensing heat exchanger GS 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
24. to the Air pressure switch 4 Unscrew the screw F and remove the bracket G Fig 71 5 Remove the Fan by sliding it towards left se the arrow in Fig 71 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 72 Fig 72 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 Fan and Air pressure switch Inspection and removal of the venturi NN Fig 73 device Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the fan section 18 3 Remove the venturi device by unscrewing the screw H 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 bo
25. trol panel as explained in the section 2 3 of this manual 2 Remove all the wiring connected to the Full se quence ignition device To disconnect the connectors A delicately flex the hook present on one side of each socket Fig 42 3 Unscrew the two screws B that hold the Full se quence ignition device on the panel and remove the component 4 Re assemble the Full sequence ignition device following the removal procedures in the reverse order 23 Full sequence ignition device onion and control sequence supply from the electronic control circuit YES lock memorised NO cancels tock J NO Air pressure switch at YES rest NO Air pressure switch at YES gt lt work beginning of wait period NO presence of flame YES NO Air pressure switch at work YES starts ignition discharges opens gas valve beginning of ignition period NO flame presence YES end of ignition closes gas valve stops fan interrupts ignition discharges period memorizes lock turns on lock out light interrupts ignition discharges gas valve open NO reset push button YES pressed r YES flame presence NO Safety thermostat No opens the circuit A L YES Air pressure switch at NO work Fig 43 24 12 Modulating gas valve EAN Function The Modulating g
26. 0 Ignition gas pressure adjustment ACC 11 J1 connector 12 Fuse1 6AT Checking the temperature The Electronic control p c b makes it possible to separ ately 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 5 and 6 in Fig 29 of the electronic control p c b DJ OO PS OM A 17 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 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 ym The result of such a comparison operates the modulation of the gas valve consequently changing the useful output of the boiler Fig 30 When the boiler functions in d h w Fig 31 the signal coming from the d h w temperature probe is compared with the signal given by the control panel through the adjustment made by the user knob 18
27. 22 indicates the relationship between the electric command coming from the electronic control p c b and the position of the actuator B brass spindle when the boiler operates 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 brass spindle when the boiler operates in c h mode In both figures the relationship between the position of the actuator and the resistance of the motor windings the motor must be disconnected from the wiring is also given Spindle B not visible e 9 4 Kohm bn brown Open circuit bu blue E bk black 2 2 2 gt Q gt alo Spindle B visible Bo Open circuit bn brown 9 4 Kohm bu blue AU de ger a 2 a bk black gt Ei amp Fig 23 mode Removal of the electric actuator NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front case panel 2 Disconnect the connectors C Fig 24 3 Remove the fixing spring D and remove the actuator E Reassemble the actuator carrying out the re moval operations in the reverse order When reassembling the actuator refer to Fig 22 or to the wiring diagram in section 3 1 for the cor rect wiring connection 15 Three way diverter valve U Fig 24 FEN
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29. REP Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Mechanical function ech 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 3 of the shaft B referring to Fig 50 Fig 51 ERR Removal NN Warning isolate the boiler from the mains tacts C and N O of the switch Remove the switch as explained in section 13 3 Measure the electrical resistance between the tabs marked C and N O Fig 51 The contact must be normally open Operate the switch by hand and verify that the contact is now closed X do not use electricity supply before removing any covering or component Removal of the switch Remove the front panel of the case Remove the fork C Fig 52 Open the box and disconnect the switch Re assemble the parts in reverse order of re moval Refer to Fig 51 for the correct wiring con nectors on the switch Removal of the membrane Remove the front and right hand side panels of the case turn off the flow and return isolation valves and empty the primary circuit Remove the fork C that holds the micro switch housing D Fig 52 TTE Fig 52 V Unscrew the four screws E see Fig 53 open the hydraulic operator and remove the membrane F 27 Primary circuit flow
30. Removal of the diverter group and its internal parts 1 Remove the front and both side case panels 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 fixing spring F Fig 25 and remove the primary circuit flow switch G 5 Disconnect both c h and d h w temperature probe respectively H and 6 Unscrew the connector J the c h flow connector and the d h w outlet connector Fig 25 7 Remove the d h w heat exchanger see section 7 2 8 Remove the fork K and move away the pipe L Fig 26 16 9 Unscrew the screw and remove the diverter group Fig 26 10 Rear view of the boiler Refer to the exploded view in Fig 27 to remove the internal parts of the three way diverter valve Fig 27 11 Reassemble the diverter group carrying out the removal operations in the reverse order 10 Electronic control p c b Function Inlet Information On the Electronic control p c b Function control C h temperature adjustment D h w temperature adjustment Function dip switches Ignition gas pressure adjustment Boiler reset button control panel fascia From other boiler devices C h temperature probe NTC D h w temperature probe NTC D h w flow switch Primary circuit flow switch Room thermostat if fitted Time switch Flame presence signal from t
31. _ mod M96 24SM mod M96 28SM Bewoicrgwaonpco D J ng 7 E83 142 Full sequence ignition device 1 811305 101 Bertelli amp Partners FM30 1 116 E00 684 Primary circuit flow switch 1 1 1 1 1 1 1 1 1 1 1 17 E83 082 D h w flow switch Dhwiowswh 81091108 200 688 Main flow switch membrane Bl1011 103 Bl1101 102 Elbi oz BER RES RENI D LU EE ILI aM UE E LO M NN fl LENT my Ko E83 086 Three way diverter valve electric actuator h w circuit Bl1123 101 23 Pp y O E83 127 Ignition electrode left 1 125 E83 126 Ignition electrode right lees 27 283 145 Temperature pressure gauge eeng 22 169 083 Fuse 1 6 A T 123 164 026 Temperature probe main d h w circuit E 11 12 18 14 15 16 17 18 19 20 21 22 25 26 27 40 Short spare parts list 41 17962 1072 1 3004 44A4 UK Biasi U K Ltd Unit 31 33 Planetary Road Industrial Estate Neachells Lane Willenhall Wolverhampton WV 13 3XB Technical helpline 01902 304 400 Web site www biasi co uk
32. as valve A in Fig 44 controls the gas inflow to the boiler burner Fig 44 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 of an 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 and maximum pressure exiting the valve Nomenclature of the parts Fig 45 1 Modulation operator s electric connectors Minimum gas pressure adjustment On off operators Maximum gas pressure adjustment On off operators electric connector Gas valve inlet pressure test point Modulation operator N O A Gas valve outlet pressure test point Fig 45 EEN 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 45 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 8 in Fig 45 and connect the gauge 5 Remove the protection cap from the mechanical pressure adjustment components 6 Start
33. ator of the gas valve After any adjustment operation the selector has to be brought back to the normal position ON Selector 2 This selects the boiler functions on the basis of the type of gas used It allows the selection of the maximum supply current given to the modulator device To set selector 2 correctly follow the table in Fig 33 Gas supply Position of selector Approx Max current through the modu lator device Natural gas 120 mA L PG 165 mA Fig 33 O Selector This forces the functioning of the boiler in order to allow the optimal gas pressure at the burner to be adjusted during the ignition phase The adjustment see section 10 7 is done by means of the potentiometer 10 marked ACC Fig 29 on page 17 After the adjustment operations bring the selector back to the normal position ON ON 1 OFF 0 gas pressure calibration Normal Fig 34 Selector 4 This allows you to select the minimum time that must pass between two ignitions of the burner in c h func tion 3 min ON 1 lg d OFF 0 30 sec Fig 35 19 Electronic control p c b Settings Two setting jumpers are fitted on the Electronic control p c b Refer to Fig 36 for the position of the jumpers The numbers refer to the marking printed on the circuit board 123456789 Fig 36 The device N indicated in Fig 37 and marked
34. ber 2 Remove the screws B and the plate C Fig 78 3 Disconnect the safety thermostat and check its electrical function Normally no intervention the ech contact must be closed electrical resistance zero 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 lid of the sealed chamber 2 Remove the screw B and the plate C Fig 78 3 Disconnect the wiring D detail in Fig 79 4 Remove the spring E which holds the overheat thermostat on the pipe of the primary heat ex changer and remove it 9 n a Fig 79 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 37 21 Flue thermostat ARH Function The Flue thermostat A in Fig 80 and Fig 81 senses the temperature of the combustion products that flow through the condensing heat exchanger A To SCH SE seg Fig 80 In the case that the temperature of the combustion products reaches a potentially dangero
35. ck the on off operators coils Remove the front panel of the case Disconnect the electrical connector C Fig 48 Measure the electrical resistance between the connector pins of the on off operators as illus trated in Fig 46 on Upper on off operator approx 6 400 Q Lower on off operator approx 920 Q at ambient temperature Fig 46 Removal of the on off operators coils 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 connector D Fig 47 3 Unscrew the screw E and remove on off oper ator coils 4 Reassemble the coils carrying out the removal operations in reverse order U E E Fig 47 26 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 B and C Fig 48 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 t
36. emove the lid of the sealed chamber For this purpose remove the front and side panels of the case remove the screws G as indicated in Fig 6 and remove the lid EX 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 BR 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 EAR Wiring diagram Wiring diagram for boiler equiped with full sequence ignition device type Bertelli amp Partners FM30 External controls Electric supply Flue Safety Fan Air pressure Ignition Flame detection terminal block terminal block thermostat thermostat switch electrodes electrode V a cb bu br Sa E d LII zas NC bk A 8 br 1 br 312 1 000 E i
37. esus eran eden eR mand 37 Removal 37 Flue thermostat 38 Function A 38 Checks geed Zeien See eg 38 Removal 2x 38 Condensate trap 39 HEED nene e e LBS etes 39 Removal 39 Short spare parts list 40 1 Overall information Overall View Flue thermostat Air pressure Sea switch Condensing Fan ET 7 heat exchanger Expansion vessel Main heat exchanger Combustion Safety chamber thermostat Burner Ignition Zoe TN Detection Automatic electrode c SS air release Diverter valve Er D h w probe 2 heat exchanger Main circuit Sa NF wen SN x Condensate D h w temp Hai trap probe lt 25 Gas m 4 Control panel Hydraulic diagram Central heating c h operation Domestic hot water d h w operation D h w D h w water return water flow inlet outlet 2 General access and emptying hydraulic circuits EN Nomenclature Fig 1 1 Right side panel Front panel Control panel lid Control panel cover Service panel O a 25 ND Left side panel Body panels NN Warning isolate the boiler from the mains electricity supply before removing any cove
38. for details D h w operation AE Excessive temperature on primary circuit O O Faulty c h temperature probe NTC Faulty d h w temperature probe NTC ANS e Faulty primary circuit 2 no water or absence of flow SE Lack of burner ignition no ignition signal from dc o O the full seqence ignition device Ignition gas pressure adjustment Minimum gas pressure adjustment Lack of power supply or fauly electronic control p c b Fauly electronic control p c b Lamp Lamp OFF ON Flashing lamp alone or simultaneously with an other lamp Flashing lamp alternate with another lamp These conditions are normal only for a short time when the power supply is applied to the boiler If permanent they indicate a faulty p c b IDE Dip switch selectors The function selectors 8 Fig 29 and Fig 32 are micro switches with which it is possible to select the various boiler control function modes In Fig 32 the selectors are illustrated in the configur ation in which the boiler is set in the factory natural gas boiler Minimum gas pressure adjustment Gas conversion Ignition gas pressure adjustment Reignition frequency 1 2 13 4 IN 0 8 Fig 32 O Selector 1 This forces the boiler to operate at the minimum gas pressure in order to allow the adjustment of the mini mum gas pressure at the burner on the modulation op er
39. function mode r YES Circulator off NO gt Ignition device off Y Circulator on Is domestic hot water outlet temperature lower than that required YES NO Supplies the ignition device Ignition device off Fig 41 22 11 Full sequence ignition device Function The Full sequence ignition device used on the boiler carries out the following fundamental functions O does a sequence of operations ignition cycle which lead to the ignition of the gas at the burner checks the presence of the flame during the en tire period in which it is activated O supplies the fan and checks its functioning by means ofthe signal coming from the air pressure Switch The Full sequence ignition device is supplied by the electronic control p c b when the ignition of the burner is requested The Full sequence ignition device has a safety function and any incorrect interventions or tampering can result in conditions of dangerous functioning of the boiler The Full sequence ignition device can lock the function ing 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 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
40. he full sequence ignition device Outlet command Pump Three way diverter valve Full sequence ignition device Modulation operator Appliance operation lights Lock out signal lamp control panel fascia Fig 28 The fundamental function of the Electronic control p c b is that of controlling the boiler in relation to the ex ternal 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 p c b receives inlet in formation coming from the boiler the sensors or from the outside knobs room thermostat etc processes it and consequently acts with outlet commands on other components of the boiler Fig 28 ER Selection and adjustment devices On the Electronic control p c b several selection ad justment and protection devices are located Fig 29 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 Fig 29 J3 connector J2 connector Lock out signal lamp Boiler reset button Function control C h temperature adjustment D h w temperature adjustment Appliance operation lights Dip switch selectors Setting jumpers 1
41. he gas valve 26 Primary circuit flow switch 27 FU Clone veces tpe ree Yau st HER 27 CHECKS gt Aug dad ii IMs 27 Removal 2 RR ERR YA 27 Expansion vessel and temperature pressure gauge 28 FUNCTION EE EEN 28 CHECKS ER EG ERES 28 Removal of the expansion vessel 28 Removal of the temp pressure gauge 28 D h w flow switch filter and flow limiter 29 Functlon ete 29 Nomenclature and location of parts 29 GHECKS ias vetere wi 29 Removal of the flow switch sensor 29 Removal of the flow switch group and d h w circuit 29 EIow HIE GT eae o e py res 30 Temperature probe 31 F nctlon Sees 31 CHECKS cs tpe Aer 31 R moVval 31 By pass valve 32 rero EMI IEEE 32 Removal 32 Fan venturi device and air pressure SWilch 2 eee et 33 Functlon 2 foe peed Le ERA 33 CHECKS 33 Removal of the Fan 34 Inspection and removal of venturi device 35 Removal of the Air pressure switch 35 Ignition and detection electrodes 36 FUNCION ab ie NUR dU 36 CHECKS Sek eae 36 Removal 36 Safety thermostat 37 Functlon sek EREEIS pe 37 Checks i
42. he 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 48 13 Primary circuit flow switch Function The Primary circuit flow switch A in Fig 49 function is Boiler OFF B Boiler ON to detect water flowrate through the primary hydraulic circuit of the boiler Fig 50 Electrical check Itis possible to verify the general operation of the switch by measuring the electric resistance between the con 1 2 1 Fig 49 2 This hydraulic membrane operated electrical micro 3 switch device will control the functioning of the ignition 4 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 E operate ch 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 2 condition see section 10 4 of this manual has oc curred
43. iam eter side towards the threaded ring 4 Reassemble the group following the above se quence in reverse order 16 Temperature probe HAH Function The Temperature probe has the function of converting the temperature of the water in the hydraulic circuit where itis installed into an electrical signal resistance The relation between temperature and electrical resis tance is stated in Fig 62 Q eue ee fale III 11500 11000 10500 10000 100 LLL sol Ts EE spe qoae p usps 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 1009 Fig 62 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 63 and Fig 64 one on the out put of the d h w heat exchanger d h w Temperature probe B in Fig 63 and Fig 64 7 c h c h d h w d h w return flow inlet outlet Fig 63 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 62 Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component
44. iler 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 72 and Fig 69a or Fig 69b 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 35 19 Ignition and detection electrodes 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 Detection Ignition 1 E Male Fig 74 Checks 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
45. nce between the connections of the Air pres sure switch Refer to the Fig 69a or b in accordance with the type of air pressure switch used Between or3 and N O or 2 the contact must be open Between COM or 3 or 1 the contact must be closed electrical resistance zero 3 Connect the black wire COM or 3 and the brown wire N C or 1 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 33 Fan and Air pressure switch Fig 69a H connection p inde ae Fig 69b Check of the venturi device This test must be carried out with the sealed chamber closed 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 70 2 Switch on the boiler Fig 70 3 Compare the value on the gauge with the follow ing minimum values 80 0 8 mbar M96 24SM 110 1 1 mbar M96 28SM 34 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 68 3 Disconnect the pipe which connect the venturi device
46. ol p c b NA Warning isolate the boiler from the mains electricity supply before removing any covering or component 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 p c b To disconnect the connectors J1 J2 and J3 11 2and 1 in Fig 29 delicately flexthe hook present on one side of each socket 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 38 4 Unscrew the four screws that hold the Electronic control 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 p c b fol lowing the removal procedures in the reverse order Important When re assembling the Electronic control 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 Electronic control p c b Insert the spindles in the control panel knobs un till the notch A Fig 39 reaches the potentio meter edge It is not necessary to force them in the knob While tightening the screws that fix the Electronic control p c b on the control panel keep the p c b towards the control panel fascia making
47. r 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 EEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 6 Remove the front and right case panels 7 Disconnect the trap from the draining pipe 8 Using pliers remove the spring D moving it up wards 9 Remove the spring E and lower the trap 10 Disconnect the wirings from the trap 11 Reassemble carrying out the removal operations in reverse order Fig 85 39 23 Short spare parts list Key G C part Description Q ty Manufac Manufacturer s reference turer part no Polidoro aseene 2 169 069 1064 505 Polidoro TT eee a Ee Injectors for LPG mod M96 245M 12 811003509 TT Vizerei NEE Mamneaexhanger mod M96289W _ 1 5 Fan 5 moiM96285W S 83 129 7 169 127 Air pressure switch 0 88 0 74 mbar 1 1267 103 Yamatake Honeywell C6065 Air pressure switch 1 12 1 00 mbar 1 1406 102 Yamatake Honeywell C6065 E83 013 Safety valve 1 Bl1131 100 Watts Ess 178 Combusionchambersdepands 2 mso RUE ______ mod M96 24SM TT ee JETT mod M96 28SM BENI C ____
48. r 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 thermostat and no overheat intervention should occur HEB 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 thermostat 3 Unscrew and remove the thermostat probe C Fig 81 from the condensing heat exchanger 4 Unscrew the screws D which hold the Flue ther mostat to the frame 5 Assemble the Flue thermostat carrying out the re moval operations in reverse sequence Warning to correctly connect the Flue thermostat refer to Fig 82 and Fig 69a or Fig 69b for the cor rect wiring ox Fig 82 22 Condensate trap EAN Function The condensate trap A in Fig 83 and Fig 85 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 83 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 84 Fig 84 If the drain pipe is plugged o
49. ring 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 the front panel To remove the front panel remove screws A Fig 2 lift the panel and remove it 2 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 Contro 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 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 Fig 5 Remove the screws E and remove the service panel Fig 5 To gain access to the electronic regulation PCB and the full sequence ignition device remove the screws F and remove the control panel lid Fig 5 General access and emptying hydraulic circuits To gain access to the parts contained in the sealed chamber it is necessary to r
50. the boiler at its maximum power Operate the boiler in d h w mode or ensure that the boiler is not range rated ifthe testis carried out in c h mode 7 Rotate the maximum gas pressure adjustment 4 in Fig 45 until you obtain the required pressure by rotating clockwise the pressure increases 8 Disconnect one of the two connectors 1 in Fig 45 or alternatively remove the service panel as explained in the section 2 3 of this manual and set the dip switch selector 1 see section 10 5 to the OFF position 9 Rotate the minimum gas pressure adjustment 2 in Fig 45 until you obtain the required pressure by rotating clockwise the pressure increases 10 boiler off and re connect the wire to the modulating operator or set the dip switch se lector 1 back to the ON position 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 25 Modulating gas valve EZB Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Check the modulation operator coil Remove the front panel of the case Disconnect the connectors B Fig 48 from the modulating operator and measure the electrical resistance of the coil Its electrical resistance value must be approx 80 2 Che
51. 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 20 Safety thermostat Function The safety thermostat A in Fig 77 and Fig 78 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 burner and at the end locks the boiler and lights the lock out signal lamp Fig 77 BER Checks 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 atemperature below that ofthe safety thermostat and no overheat intervention should occur NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Electrical function Remove all the case panels and the lid of the sealed cham
52. tside 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 73 and an Air pressure switch C Fig 67 and Fig 68 e i D us ES NI SV Fig 67 Checks Check 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 and the sealed chamber lid 2 Disconnect the connectors D Fig 68 and measure the electrical resistance of the motor that has to be about 43 M96 24SM 25 M96 28SM at ambient temperature Fig 68 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 sista
53. us 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 the temperature of the combustion products circuit reaches the limit temperature the Flue thermostat opens the electric circuit that supplies the on off oper ators of the gas valve Consequently the full sequence ignition device at tempts to light the burner and at the end locks the boiler and lights the lock out signal lamp The Flue thermostat is a push button reset type This allows to recognise if the lock out has been due to its intervention or to another different cause flame failure main circuit overheating etc The reset push button is located on the top of the boiler under a protective cap B in Fig 81 and can be re ached by unscrewing the cap The intervention of the Flue thermostat may be caused by a defective operation of the device but more probably is due to a poor heat exchange and therefore to a low efficiency of the boiler In this case the cleaness of main and condensing heat exchangers is recommended 38 E R _ IP Sur vod Un O ol Fig 81 Checks Overheat temperature value 1 Set the temperature control knobs to their max position and run the boile
54. y 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 remove the fork D and the pipe E H Tee _ CN X E EE y gt Fig 19 6 Remove the fork F Fig 20 and the connection of the capillary pipe of the pressure gauge 7 Remove the locking plate G Completely loosen the connection H 9 Unscrew the two screws that hold the pump the frame and remove the pump SS SL S Us A 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 between the pump and the brass group 9 Three way diverter valve 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 ERM Checks Check the electrical continuity Fig
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