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SERVICE MANUAL RIVA PLUS M90D.24S M90D.28S M90D.24SR

1. Full sequence ignition device rd PEN bk DHW temperature DHW flow probe NTC switch bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow Primary circuit CH temperature flow switch probe NTC Three way diverter valve Pump Modulating gas valve rd fe I o wh o Time switch Diagrams EE Wiring diagram M90D 24SR M90D 28SR Wiring diagram for boiler equiped with full sequence ignition device type Bertelli amp Partners FM30 External controls terminal block Electric supply terminal block Safety Fan Air pressure Ignition Flame detection thermostat switch electrodes electrode E bg
2. ic d 1A OR Fig 66 A 5 Reassemble the by pass valve as illustrated in Fig 65 Fig 66 reversing the order of removal 34 17 Fan venturi device and Air pressure switch Function The function of the Fan is to force the products of com bustion 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 A in Fig 73 and an Air pressure switch 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 B Fig 67 and measure the electrical resistance of the motor that has to be about 47 Q M90D 24S M90D 24SR 43 Q M90D 28S M90D 28SR at ambient temperature Fig 67 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 Dis
3. NC I bk 222 a NC ebe 3 2 1 Wd Se 2 KE ay E PN o o s Vs sl o ae DER 3 xox rd 6255 E X p o r 000000 ge J Electronic S 53 5 control p c b S im N bk L rd tu Full sequence ignition device d N Li d Li M rq M bk N bk Primary circuit Ch temperature flow switch probe NTC Modulating Pump gas valve bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow Diagrams Wiring diagram for boiler equiped with full sequence ignition device type Honeywell FPLD Electric supply Safety Fan Air pressure Ignition Flame detection terminal block thermostat switch electrodes electrode er he c 953 NC bk a EDD wh 3 2 1 H e 2 e T Nal e ooo gt gt gt LLL ooo 7 s l oY v Je E J 5 al NN b
4. IS Fig 48 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 ofthe 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 9 4 of this manual has occurred Fig 49 EEN Checks NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Mechanical function 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 50 ech Boiler OFF B Fig 50 Boiler ON Electrical check Itis possibleto verify the general operation of the switch by measuring the electric resistance between the con tacts C and N O 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 O Fig 51 The contac
5. 1 2 4 ou N ofr 0 8 Fig 31 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 erator 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 32 Gas supply Position of selector Approx Max current through the modu lator device Natural gas 120 mA L PG 165 mA Fig 32 O Selector 3 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 9 7 is done by means of the potentiometer 10 marked ACC Fig 28 on page 19 After the adjustment operations bring the selector back to the normal position ON ON 1 OFF 0 gas pressure calibration Normal Fig 33 O 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 34 21 Electronic control p c b PER
6. Fig 29 When the boiler functions in d h w Fig 30 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 bat 20 Fig 30 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 2 function and in 2 func tion are illustrated in detail in sections 9 11 and 9 12 EX Operation lights The Electronic control p c b is provided with three lamps L E D indicators 7 in Fig 28 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 in ag or 3 position 1 sec
7. ic d r3 GO Fig 17 Checks NA 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 18 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 16 Lk Check that the impeller is integral with the rotor With the boiler off remove the front and
8. s esos Three way dvenervate ecic acua Y emon Eb U lem pement S most C 22 pwa om Temperature probe train or ahw crea i emer alem umtonsecode e i stts m ems iomon erode i stts leg pesones i Bii 40 Short spare parts list AY gt 17962 0914 6 3804 44A4 UK
9. 6 D h w heat exchanger GS Function The d h w heat exchangerA in Fig 13 allows the instan taneous transfer of heat from the primary hydraulic cir cuit to the water destined for d h w use a2 AY Fig 13 The schematic structure is shown in Fig 14 A V A V m Primary hydraulic circuit Domestic hot water circuit Fig 14 ER Removal NA Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 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 Remove the motor of the three way diverter valve see section 8 3 4 Completely unscrew the two Allen key screws B Fig 15 which hold the exchanger to the brass groups Fig 15 5 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 16 towards the left side of the boiler Fig 16 15 7 Pump Function The pump A in Fig 17 has the function of making the water in the main circuit circulate through the main heat exchanger and therefore through the c h system dur ing the c h function or through the secondary heat ex changer during the d h w function
10. Wall hung fan flue room sealed gas boiler SERVICE MANUAL RIVA PLUS Models G C Appl No M90D 24S 47 970 15 M90D 28S 47 970 16 M90D 24SR 41 970 08 M90D 28SR 41 970 09 Leave this manual adjacent to the gas meter 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 A BIASI Table of contents om Mi A Overall information 2 Overall View 2 Hydraulic diagram 2 General access and emptying hydraulic circuits 3 Nomenclature 3 Body panels 3 Control panel 3 Access to the sealed chamber 4 Emptying the primary circuit 4 Emptying the d h w circuit 4 Diagrams esee 5 Wiring diagram M90D 24S M90D 288 5 Wiring diagram M90D 24SR M90D 28SR 7 Functional flow diagrams 9 Circuit voltages 10 Fault finding 12 Primary heat exchanger 14 Characteristics 14 Removal usa See rei weet ss 14 Cleaning 14 D h w heat exchanger 15 FUNCION zuerst SEN RD 15 Removal 15 PUMP uy ivi ler eee 16 FONCION EREECHEN 16 GHECKS za eae ed ee 16 Removal 2I e ee 16 Three wa
11. Ag 2 e 9 E e o m Ra Z gm D s 5 lt 2 gt o 5 lt 3 oO Q e EI n ml o ei o amp o 2 2 g 2 lt 0 S eo lt o o c Q amp E 9 ei 9 SL N eo 6 fenueuu uonejeisui osje ees Dui 3991100 S AJH A pue JINDIIO y jo sseupunos 104 499u2 ceo Jejioq eui Aq xoeq pexons ou si se jsneuxe yey ens Z us pue seoueJeojo eos pej eisur A noeJ100 si euru an eus yeu Aja suomnonuisqo Jo eouesqe pue sseupunos JO 429u2 9 Jep400q uonejeijsur ay uo USAIH senjeA eui ui y ejeduioo pue uonejedo Buunp pue 1S9 ye J9 IOQ 9U1 A Des ees Aea seb au JO uiod 1s81 19 UI y ye eunssaJd sef aui voa S40jo9Jos uonounJ q o d uonejn698J esnj yoyms AO Wu q o d Dau q o d uone jnB tj Joje1edo BunejnpouJ eA eA sey Sep eouenbes Wm SE s jw II J Bueuox y WU N N N Svi ccl YLL c0 x9euo 0 sjueuoduuo2 e IJ SOA eA dois jo uonisod au edid Ajddns se6 oun jo sseupunos y Aan Z uonoeuuoo enneu pue eui Jo Ajuejod eui Y42949 s sni jeusa xe pue Bnid ajqeo Ajddns jo AUB eui Ae N Ienn u pue q euj u w q AOEZ 104 eu L p 6 uonoes ees sluBil uone 10do eoueijdde y Aq u A B uoneoripuri jeondo y WO1 Osje peurejqo eq ueo uoneulnojur njesf SON JO S 1 lloq eui U8UuM AJLA j9jes eui LO SXeo 19M y o uo uogeiedo Buunp eA eA j9Jes ay wo syed 1916 4 ay
12. 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 ERR 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 burner by unscrewing the four screws placed at the right and left sides of the burner 3b For models M90D 28S and M90D 28SR remove also the plate C see Fig 78 on page 39 4 Unscrew the screws A Fig 76 which hold the electrodes to the burner 5 Extract the electrodes from the burner 6 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 the one of the ignition electrodes Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chap
13. SSES ci o gt e P Electronic Se LE o control p c b PSESa Dom 3 bk rd CU Full sequence ignition device N ao o d LL LL Se rd wh 7 M rq bk bk bu 7 bk D h w temperature probe NTC bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow D h w flow switch Primary circuit Ch temperature probe NTC flow switch Three way diverter valve Pump Modulating gas valve Time switch Diagrams Wiring diagram for boiler equiped with full sequence ignition device type Honeywell FPLD Electric supply alternative wiring colours terminal block T Safety Fan Safety Fan Air pressure Ignition Flame detection External controls thermostat thermostat switch electrodes electrode terminal block b n vc bu S b ye i ie 411 55 b 85 NC bk f H 88 u wh 3 2 1 m i g a 2E e es RH 4 fa gnye aa ooo gnye 5 1 N J f bk Ie G d bu H bu e e gy E EC eege bn i x i Seee www bb XP J 3 gt K Electronic er e TL Cl bn amp control p c b PSESa bu M S e bn S s S Um ej bu BH 90 H Jo U bk
14. Switched on when the flow rate reaches about 2 5 litres min EEN 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 the connector C Fig 57 and remove the sensor by pulling it towards the front of the boiler the sensor is held in place by means of a spring I 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 31 D h w flow switch filter and flow limiter 2 Remove the flow switch sensor see section 14 4 3 Remove the gas valve see section 11 6 4 Unscrew the plug 2 Fig 58 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 58 by unscrewing it 6 Reassemble the parts following the removing se quence in reverse order Attention the ring 3 Fig 58 has a magnetic polarity 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 59 ANAC e amp iu N 7 7 EL Eus S TN x 3 DD II be d Fig 59 2 Restore the mains electricity supply to th
15. connector D Fig 46 3 Unscrew the screw E and remove on off oper ator coils 4 Reassemble the coils carrying out the removal operations in reverse order Fig 46 28 NR Removal of the gas valve NA 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 47 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 refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual Fig 47 12 Primary circuit flow switch AHN Function The Primary circuit flow switch A in Fig 48 function is to detect water flowrate through the primary hydraulic circuit of the boiler A E l
16. 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 the full sequence ignition device Sw ee ta Outlet command Pump Three way diverter valve Full sequence ignition device Modulation operator Appliance operation lights Lock out signal lamp control panel fascia 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 27 EYEE Selection and adjustment devices On the Electronic control p c b several selection ad justment and protection devices are located Fig 28 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 J3 connector J2 connector
17. right panels of the boiler 3 Open the drain tap l Fig 8 until the boiler is com pletely emptied 4 Close drain tap again once the emptying has been completed Fig 8 HR 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 Diagra EAR Wiring diagram M90D 24S M90D 28S ms Wiring diagram for boiler equiped with full sequence ignition device type Bertelli amp Partners FM30 Electric supply E terminal block alternative wiring colours External controls Safety Fan Safety Fan Air pressure Ignition Flame detection terminal block thermostat thermostat switch electrodes electrode bn vc bu rt bn L ye y 411 N gt je A 8 EBB bu 555 Ne i 32 1 ni hi Se a Kaz SES ie N S vi Vs d bu le f EE M o gy o Se ge s rd 6265
18. sequence ignition device Electronic control p c b J3 3 Three way diverter valve Full sequence ignition device Diagrams EZB Circuit voltages FM30 Diagrams for boiler equiped with full sequence ignition device type Bertelli amp Partners Electrical voltages with burner on during c h or d h w operation only during c h operation only during d h w operation IL TII TE 230 Q OU E JL Q 3 o i c gt Gi o o Hung O 230 230 Modulating Gas valve JL 0 Safety thermostat Fan 230 H Air JL pressure Switch 0 0 CC Electronic IC control p c b 230 10 3 way diverter valve Pump Full sequence Ignition device Electronic control p c b Diagrams for boiler equiped with full sequence ignition device type Honeywell FPLD Electrical voltages with burn
19. wires from the Air pressure switch 3 Remove the pipe from the Air pressure switch 4 Unscrew the screws which hold the Air pressure switch to the frame 5 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 68a or Fig 68b for the correct wiring Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual 37 18 Ignition and detection electrodes EEXIB 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 e Detection Ignition 1 E Male Fig 74 EEN 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 combustion chamber lid 2 Check for the correct distance between the me tallic edges of the ignition electrodes see Fig 75 MN Ignition lt T A Fig 75 38
20. 3 Disconnect the pipe which connect the venturi device to the Air pressure switch 4 Unscrew the screws D and remove the clamp E Fig 71 Fig 71 5 Remove the three screws F Fig 67 securing the Fan to the flue hood and remove the fan 36 6 Assemble the fan carrying out the removal oper ations in reverse sequence 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 refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual Inspection and removal of the venturi device NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the fan section 17 3 Remove the venturi device by unscrewing the screw G 3 Inspect the venturi device A and the connection pipe H Ensure they are clean 4 Re assemble the parts in reverse order of re moval Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual N Fig 73 Fan and Air pressure switch Removal of the Air pressure switch 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
21. 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 10 Ignition gas pressure adjustment ACC 11 Maximum ch gas pressure adjustment RISC 12 J1 connector 13 Fuse 1 6AT EE 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 19 AN O OQ Go N o Electronic control p c b trol panel knobs operates the variable elements 5 and 6 in Fig 28 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 maximum power output During the c h operation Fig 29 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 The result of such a com parison operates the modulation of the gas valve consequently changing the useful output of the boiler
22. RR 39 Short spare parts list 40 1 Overall information A Overall View Air pressure switch Fan o Main heat exchanger w Safety thermostat 7 Burner I Combustion chamber Ignition i eme asa Detection p electrode L I H Diverter vave KA Ki E valve TE f Main circuit flow switch n D h w temp e probe Gas valve d Pump _ n D h w Soe b flow switch EE Hydraulic diagram Central heating c h operation AY X E C h C h water return water flow Expansion vessel D h w heat exchanger Domestic hot water d h w operation lt AY d D h w inlet outlet D h w 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 CQ ND Left side panel EE 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 the front panel To remove the front panel remove screws A Fig 2 lift the panel and remove it Fig 2 To remove the side p
23. Setting jumpers Two setting jumpers are fitted on the Electronic control p c b Refer to Fig 35 for the position of the jumpers when the Electronic control p c b is fitted on a M90D 248 or M90D 288 boiler Refer to Fig 36 when the Electronic control p c b is fitted on a M90D 24SR or M90D 28SR boiler The numbers refer to the marking printed on the circuit board 123456789 Fig 35 123456789 Fig 36 Ignition gas pressure adjustment By using the device 10 Fig 28 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 33 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 EXE Max c h power adjustment By using device 11 Fig 28 marked RISC on the Electronic control p c b you can limit the maximum useful output deliver
24. al gas 14 mod M90D 28S M90D 28SR 169 070 Injectors for LPG mod M90D 24S M90D 24SR 12 KI1064 506 Injectors for LPG mod M90D 28S M90D 28SR Main heat exchanger mod M90D 24S aoe 101 M90D 24SR Main heat exchanger mod M90D 28S Bl1202 102 M90D 28SR P a Fan mod M90D 24S M90D 24SR BI1366 102 FIME GR02040 39W Fan mod M90D 28S M90D 28SR ux Bl1366 103 FIME GR02045 47W a 129 Gas vave 1 1 1 valve SIT 845 Sigma 169 127 GE pressure switch 0 88 0 74 is UL 103 Yamatake LE C6065 i e pressure switch 1 04 0 92 mbar BI1366 107 V Honeywell C6065 E83 013 aes valve Bl1131 100 Watts PE E83 178 Combustion chamber side Combustion chambersidepanels po EM e BI1326 100 10 E83 180 Combustion chamber rear panel BI1326 107 mod M90D 24S M90D 24SR E83 181 Combustion chamber rear panel BI1326 108 mod M90D 28S M90D 28SR E83 196 Combustion chamber front panel 1 BI1326 101 mod M90D 24S M90D 24SR E83 197 Combustion chamber front panel BI1326 102 mod M90D 28S M90D 28SR EE EE Electronic Electronic regulation p c b p c b RS Bl1515 107 E83 142 Full sequence ignition device BlI1305 101 amp Partners FM30 Honeywell FPLD alternative lees ohwmemocwr a E Be pe 000 h preo Sd s E00 e84 Pimayourtowswn D nn Jee Dhwwsih o p Wer s Eoo ess Vai fowsuhmembane Bon
25. anels 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 PEW 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 1 Remove the front panel of the case Loosen the screws B and C Fig 3 Remove the screws D A Go m 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 3 General access and emptying hydraulic circuits 5 Remove the screws E and remove the service panel Fig 5 6 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 Fig 5 Fig 6 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 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
26. circuit flow switch 29 Functlon az Cosebte cep emi obere 29 GHEGCKS Z sg e ura ea UE RH IN 29 Removal 29 Expansion vessel and temperature pressure gauge 30 FUNCUON zie ueni bre i uS 30 CHECKS ciae torinese 30 Removal of the expansion vessel 30 Removal of the temperature pressure gauge Re o x ehe 30 D h w flow switch filter and flow limiter 31 FUNCTIONS tebe ALLEE 31 Nomenclature and location of parts 31 GECKS hes duties E hare dace ic ET 31 Removal of the flow switch sensor 31 Removal of the flow switch group and d h w circuit filter 31 Flow limiter 32 Temperature probe 33 Functlon zu etek gece ean teas nes 33 Checks ice a re dow edes 33 Removal 33 By pass valve 34 FUNCION 4 uran agua la ve e 34 Removal sacs ee uae E E Red 34 Fan venturi device and Air pressure switch 35 mre e TE 35 GHECKS vixit erai mee ET 35 Removal of the Fan 36 Inspection and removal of the venturi device 36 Removal of the Air pressure switch 37 Ignition and detection electrodes 38 EUKICUDDIGS S seite PEDE UE E IE 38 CHECKS edes viera PEE uk IRR 38 Removal L shee eee hee 38 Safety thermostat 39 reno P E 39 CHECKS au Zes Ene mitten ren ve 39 Removal wu ls E
27. connect the wires and check the electrical re sistance between the connections of the Air pres sure switch Refer to the Fig 68a or b 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 Connectthe 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 NC NC ch pl wo H connection r0 Fig 68a H connection TU connection 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 35 Fan Fig 70 3 Compare the value on the gauge with the follow ing minimum values 90 Pa 0 9 mbar M90D 24S M90D 24SR 100 Pa 1 0 mbar M90D 28S M90D 28SR 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 B and the earth con nection C Fig 67
28. control p c b CREN Thermal control in the mode Switch in the oe function mode See functioning with the function control in the 3 mode YES NO sec 9 12 Is primary circuit temperature higher than that selected YES NO Request for heat from room thermostat Re 21 Circulator off Starts the circulator Operates motorised valve Operates motorised valve Ignition device off Supplies the ignition device Fig 39 ESP Thermal control in the 3 mode Switch in the X function mode 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 40 24 10 Full sequence ignition device HERR 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 O 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 of the 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 i
29. e 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 60 4 Observe the lamp B placed on the sensor body that should light If not reverse the ring and repeat the previous operation zoo b 32 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 60 EX Flow limiter The M90D 24S model is factory fitted with a 10 litre min flow limiter If on the M90D 28S model the flow rate of the d h w cir cuit is too high it is possible to limit it by installing a flow limiter The following sizes are available Colour Nominal flow rate litres min To install the flow limiter 1 Remove the flow switch group as explained in the section 14 5 2 Unscrew the threaded ring 10 Fig 58 and re move it from the body 7 3 Install the flow limiter 9 putting its smaller diam eter side towards the threaded ring 4 Reassemble the group following the above se quence in reverse order 15 Temperature probe EENI Function The Temperature probe has the function of converting the temperature of the water in the hydraulic circuit where it is installed int
30. ed during the c h operating mode This adjustment does not influence the maximum use ful output delivered during the d h w operating mode By rotating the device clockwise the pressure in creases EX 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 13 Fig 28 is complete 22 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 35 and Fig 36 EAT Removal of the electronic control p c b NN 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 12 2 and 1 in Fig 28 delicately flex the 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 37 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 wiri
31. efore removing any covering or component Empty the primary circuit of the boiler 2 Remove the case panels and the sealed chamber lid see section 2 3 Remove the combustion chamber lid B by un screwing the screws C Fig 11 3b For model M90D 28S and M90D 28SR only re move the screw D and the plate E 4 Remove the clips F and the safety thermostat G It is not necessary to disconnect it from the wiring 14 5 Unscrew the connection H Fig 12 lift the pipe l and rotate it right then move it downwards free ing it from the heat exchanger connection 6 Remove the motor of the three way diverter valve see section 8 3 7 Completely unscrew the connection J and rotate the pipe K downwards freeing it from the heat ex changer connection 8 Remove the heat exchanger by sliding it for wards 9 Reassemble the boiler carrying out the removal operations in reverse order Fit the clips F with the arrow pointing upwards as illustrated in Fig 11 Fig 12 ER 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 refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual
32. er on C2 e during c h or d h w operation only during c h operation only during d h w operation Diagrams x o o c gt Gi o O JC S 230 e gt JIC Ugg O O TH 230 230 Kan O JoL Modulating Gas valve 0 L Safety thermostat Fan 230 Air BN pressure switch 0 0 r Electronic IC control p c b 230 O 3 way diverter valve Pump Full sequence Ignition device Electronic control p c b 11 uonouni wp UO uoneJedo eLLION W9 UO JIYM HOYS e JO SUD J lloq eu 1 yd uo poeu100 seje1edo Joo0 eu p eurey OU jo uone npouuJ y UO Dag 1juseu qoux jueuusn pe duet wu p eui Buruan egnejedujej N Wp eui 04uoo 1 useop Je ioq 9u UIn 1 us op Ue epoul Wwup JO Uo ui JAYNE WD 1juseop aunq eu Sum Ue epoul Wwup JO U o ui Jjeuye WD 1juseop aunq eu IIRS ue4 440 siui uonegedo out IIV epoul wu p JO UD ui 13449 uejs JOU seop Je ioq eu ureBe s90 Je jioq eui p
33. es MOJ WU D MO ainyesodua Wu p 100d UunululuJ je surewa aunq y o1 eunssead se6 oun 10 poeuo0 seyesedo 1 lloq eu Jeioq ASION uomneinpouu 1994109U epoui NUp uo Apoa sejeJedo Joo SUL yeoy 1ou seop uu ls s UD ay pue 9 94 Seuoeai PNOO Uew OU Jo eunjejeduue eui 9pouu y 2 uo ww Up Jo Bulmeip e Buunp u A epouu u o ui uoneJedo 1ejnDeH de au Woy eje pjoo w u p Ajddns jou seop Joo eu Dal duet euBis ino 3201 t oa sedid an eui Ajddns seo eui Aj ddns samod s ayOeJG ul eJ e1ou enueui y jo uonoesg D D 5 Primary heat exchanger ERM Characteristics 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 A ipe x A Pas O l Fig 9 The hydraulic circuit is composed of 8 elliptical pipes connected in parallel Fig 10 Fig 10 EX Removal NA Warning isolate the boiler from the mains electricity supply b
34. limiter EAN Function The d h w flow switch A in Fig 56 is a device that gener ates an electrical signal when hot water is drawn CT X il NS T L L Fig 56 When the flow rate through the d h w circuit reaches about 2 5 litres min the float 4 Fig 58 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 of the sensor is also indicated by means of the lamp B placed on the sensor body Fig 57 IEEJ Nomenclature and location of parts Fig 58 Flow switch sensor Plug Magnetic ring Float Spring Filter Body Spring seat Flow limiter M90D 28S optional accessory 0 Threaded ring O O O OQ Go NN Fig 58 EEN Checks NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Lk 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 57 placed on the sensor body is
35. ncorrect 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 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 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 42 shows the sequence of the operations that are carried out at the start of every ignition cycle and during normal functioning WEJ Checks Lk Lock sequence Start the boiler until the burner is ignited O OO O OO With the burner firing interrupt the gas supply The Full sequence ignition device must carry out a comple
36. ng 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 8 Insert the spindles in the control panel knobs un till the notch A Fig 38 reaches the potentio meter edge It is not necessary to force them in the knob 9 While tightening the screws that fix the Electronic control p c b on the control panel keep the Electronic control p c b ton B and the tab C Fig 38 After installing the Electronic control p c b Make sure the c h m and d h w A tempera ture adjustment knobs can move freely for the complete range If not remove the spindle again as described at step 3 turn the knob half a turn and re insert the spindle p c b towards the control panel fascia making Attention sure of the contact between the boiler reset but 10 11 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 refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual 23 Electronic
37. nning 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 YES L YES Air pressure switch at NO work Fig 42 26 11 Modulating gas valve HERR Function The Modulating gas valve A in Fig 43 controls the gas inflow to the boiler burner Le Fig 43 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 ER Nomenclature of the parts Fig 44 1 Modulation operator s electric connecto
38. o an electrical signal resistance The relation between temperature and electrical resis tance is stated in Fig 61 Q 12500 12000 11500 11000 10500 10000 9500 9000 8500 8000 7500 7000 6500 6000 5500 5000 so gi en SR EF E RA ER a PE EET LES DNI so EE EE NIGRI RS D EE E D a LED T d EE GCSE CER FRED UR EE D ES EN EE EC E CE so RR E DEN ER E S RE ES RT a ET xo Fa FEES ES LS REES EES ER ER ER 2000 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 1000 Fig 61 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 62 and Fig 63 one on its input before the pump d h w Temperature probe B in Fig 62 and Fig 64 JJ e c T E z 258 lis t Z i J IP ani ch ch inlet retur flow ECH Fig 62 IEEBM Checks Temperature resistance relationship NA 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 Temperatu
39. o overheat intervention should occur Electrical function Remove all the case panels and the lid of the sealed chamber 2 Disconnect the safety thermostat and check its electrical function Normally no intervention the ech contact must be closed electrical resistance zero Q EEN Removal NA 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 1b For models M90D 28S and M90D 28SR remove the screw B and the plate C Fig 78 2 Disconnect the wiring D Fig 79 3 Remove the spring E which holds the overheat thermostat on the pipe of the primary heat ex changer and remove it 4 Reassemble the overheat thermostat carrying out the operations in reverse order 5 Apply an adequate quantity of heat conducting compound between the pipe and the thermostat Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual 39 20 Short spare parts list Key G C part no Description Q ty Manufac Manufacturer s reference turer part no a 148 Burner mod M90D 24S M90D 24SR KI1004 102 Polidoro a 149 Burner mod M90D 28S M90D 28SR KI1004 147 169 069 Injectors for natural gas 12 KI1064505 Polidoro mod M90D 24S M90D 24SR Injectors for natur
40. ond ON 1 second OFF With the boiler switched ON a or S all the lamps 7 in Fig 28 are activated Thefollowing table gives the relationship between each of the possible lamp combinations and their meaning acy O O Normally operating boiler UNO see the previous table for details O D h w operation O O xx Excessive temperature on primary circuit O XX x Faulty c h temperature probe NTC Faulty d h w temperature probe NTC qu e O Faulty primary circuit E no water or absence of flow VAL e im Lack of burner ignition no ignition signal from 2 M the full segence ignition device Ignition gas pressure adjustment Minimum gas pressure adjustment Lack of power supply or fauly electronic control p c b ee 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 CEN Dip switch selectors The function selectors 8 Fig 28 and Fig 31 are micro switches with which it is possible to select the various boiler control function modes In Fig 31 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 Ir Reignition frequency
41. re probe is located and check the electrical resistance according to the graph in Fig 61 ERR Removal NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Refer to Fig 63 for the c h Temperature probe and to Fig 64 for the d h w Temperature probe 1 To remove the Temperature probes remove the front and right hand side panels of the case 2 Empty the primary 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 Fig 64 33 16 By pass valve HZ Removal HAH 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 if the 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 8 4 of this manual cd 4 Unscrew the connector B and remove the by t pass valve C Fig 66 d GO Ba
42. 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 NA 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 18 Unscrew the connection C and move the pipe up wards freeing it from the outlet port of the pump Remove the fork D and the capillary pipe 7 Remove the locking plate E right Fig 18 aR O N o 8 Loosen the connection F remove the fork G and the pipe H 9 Unscrew the two screws that hold the pump on the frame Fig 19 and remove the pump towards the front of the boiler Fig 19 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 8 Three way diverter valve ESM Function The diverter valve A Fig 20 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 hea
43. rimary circuit of the boiler 2 Remove the protective cap J Fig 53 from the valve on the top of the expansion vessel and con nect a suitable air pressure gauge Fig 53 3 Check the pre load pressure and refer to the section Expansion vessel in the User manual and installation instructions for the correct value ERR 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 30 NA 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 54 and remove the expansion vessel from the top of the boiler Fig 54 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 M and the probe holder spring N Fig 55 3 Squeeze the tabs O to release the temperature pressure gauge P and remove it 4 Re assemble the parts in reverse order of re moval Fig 55 14 D h w flow switch filter and flow
44. rotating clockwise the pressure increases 10 Turnthe 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 27 Modulating gas valve UEN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Lk Check the modulation operator coil Remove the front panel of the case Disconnect the connectors B Fig 47 from the modulating operator and measure the electrical resistance of the coil Its electrical resistance value must be approx 80 Q Check the on off operators coils Remove the front panel of the case Disconnect the electrical connector C Fig 47 Measure the electrical resistance between the connector pins of the on off operators as illus trated in Fig 45 N on Upper on off operator approx 6 400 Q Lower on off operator approx 920 Q at ambient temperature Fig 45 RER 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
45. rs Minimum gas pressure adjustment On off operators Maximum gas pressure adjustment On off operators electric connector Gas valve inlet pressure test point Modulation operator oN O O Go N Gas valve outlet pressure test point Fig 44 RER 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 44 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 44 and connect the gauge 5 Remove the protection cap from the mechanical pressure adjustment components 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 ifthe testis carried out in c h mode 7 Rotate the maximum gas pressure adjustment 4 in Fig 44 until you obtain the required pressure by rotating clockwise the pressure increases 8 Disconnect one of the two connectors 1 in Fig 44 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 9 5 to the OFF position 9 Rotate the minimum gas pressure adjustment 2 in Fig 44 until you obtain the required pressure by
46. t ex changer towards the c h system or towards the d h w heat exchanger AY pa t d Fig 20 EME Checks Lk Check the electrical continuity Fig 21 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 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 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 gt g gt alo Spindle B visible Bo Open circuit 9 4 Kohm bn brown bu blue ee bk black 9 2 gt 2 9 N o Fig 22 C h mode EN 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 23 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
47. t must be normally open 3 Operate the switch by hand and verify that the contact is now closed C No X S do not use Fig 51 EEN Removal NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Lk Removal of the switch 1 Remove the front and right hand side panels of the case 2 Remove the fork C Fig 49 3 Open the box and disconnect the switch 4 Re assemble the parts in reverse order of re moval Refer to Fig 51 for the correct wiring con nectors on the switch LG Removal of the membrane 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 C that holds the micro switch housing D Fig 49 3 Unscrew the four screws E see Fig 52 open the hydraulic operator and remove the membrane F 29 Primary circuit flow switch F Y H S Fig 52 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 52 13 Expansion vessel and temperature pressure gauge EENI Function The Expansion vessel in Fig 48 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 p
48. te 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 Lk 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 OM 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 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 41 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 25 Full sequence ignition device HEE onition and control sequence supply from the electronic control circuit YES lock memorised NO L cancels tock NO Air pressure switch at YES rest NO Air pressure switch at YES work beginning of wait period NO presence of flame YES NO Air pressure switch at work YES starts ignition discharges opens gas valve begi
49. ter Maintenance of the installation instructions manual 19 Safety thermostat ERR Function The safety thermostat A in Fig 77 is a device that senses the temperature of the primary circuit water which flows in the outlet pipe of the primary heat ex changer 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 l XS Fig 77 EEJ Checks NA Warning isolate the boiler from the mains electricity supply before removing any covering or component Overheat temperature value 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 n
50. the actuator refer to Fig 21 or to the wiring diagram in section 3 1 for the cor rect wiring connection 17 Three way diverter valve Sy cwm D Fig 23 EE 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 8 3 4 Remove the fixing spring F Fig 24 and remove the primary circuit flow switch G 5 Disconnect the c h temperature probe H 6 Unscrew the connector the c h flow connector and the d h w outlet connector xw FL T 7 Remove the d h w heat exchanger see section 6 2 8 Remove the fork J and move away the pipe K Fig 25 18 9 Unscrew the screw L and remove the diverter group Fig 25 Rear view of the boiler 10 Refer to the exploded view in Fig 26 to remove the internal parts of the three way diverter valve y 11 Reassemble the diverter group carrying out the removal operations in the reverse order 9 Electronic control p c b ERR Function Fig 27 Inlet Information On the Electronic control p c b Function control C h temperature adjustment D h w temperature adjustment Function dip switches Max c h gas pressure adjustment Ignition gas pressure adjustment Boiler reset button control panel fascia From other boiler
51. u M f Oo rd the Eexa A L I if 9900006008 9 I e gt x v d y Electronic IS SS leee S E 5 control p c b e S bl Dom Sj LIIn Full sequence ignition device bk n bk Primary circuit CH temperature flow switch probe NTC Modulating Pump gas valve bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow Diagrams EXHI Functional flow diagrams General layout J1 1 Fuse 1 6A T PTC Electronic control p c b low voltage section Transformer Jer op 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 low voltage section Transformer x s J3 5 d 1 J3 4 1 S PSH SP Three way diverter valve Ji 2 EE _ gt _ N ted em J3 1 AN J3 2 J2 5 J2 4 te dy Full sequence ignition device Electronic control p c b low voltage section Transformer D ad M J3 3 Three way diverter valve Full
52. ue enunuoo Spe uoniuBi y uo sluBii jeuung eu ejo o uoniuBi y suls Joo eu uognq usnd s eu Buisseid Ag ureDe S90 1 lloq eu pue enunuoo sxyjeds uous y UO 1uBi 3 usoop 1euunq eu ejoKo uoniuBi y suls Jejoq eu uognq usnd s eu Buisseid Ag Apoe4100 seje1edo pue uo suuni Je og eu uognq usnd s eu Buisseid Ag icu ad dan Logd ec t oa ww L L 1 1 3 M pelea d m m m X o D 2 9 o 2 lt n o o waa e N a e ar eee ee ee ee eee N Fe a el ee ee ee m ee Kn p p Eo d Js WEE E MEE EE NE DENS 1S ULTIMI U91IMS ainssed Iy E HE es ES N esa L TL L T L 2 2 oO 2 lt Q lt Di oO c Q oO SL Svi cct vi c0 Oe 0 sjueuoduuo2 N eo Duipuy me peJ dw peusis ino 3201 s ayOeJQ ul eJ e1ou Jenuew y jo uonoeg v 12 9 L Jeu eye Moy e ues ui uessooeu J UD 001 ayes mOj 10 uBiu 003 eunsseud wu p SenjeA Jedoud JO jenuew uonpljje su y 0 J9J8H l sS A uoisuedxe eui jo uonezunsseJd eui YOBUD S103oefui Jo sseuueejo eui AEA Jep1ooq uonejeisui eui uo USA en eA y uim 1 eueduuoo pue g es ees au seb ou IO JUIO eat 19jino eur ye eunsse4d se uinuululuu 34 X09490 Jejisouueu AJayes y jo uonueAJejul BU pue yno urew y jo Bulyeay 4J9A0 eui esneo Dino ssed Aq peuuuref y U91IMS eJnsseJd Jy O IA p uniueA pue Ue oun ssed
53. y diverter valve 17 EUR 17 Checks sa umay uapa eee a 17 Removal of the electric actuator 17 Removal of the diverter group and its internal parts 18 Electronic control p c b 19 Eu nctlon 2 a Sue tae il br Lr Er tes 19 Selection and adjustment devices 19 Checking the temperature 19 Operation lights 20 Dip switch selectors 21 Setting jumpers 22 Ignition gas pressure adjustment 22 Max c h power adjustment 22 Checks bx Sev teeta 22 Removal of the electronic control p c b 22 Thermal control in the nape mode 24 Thermal control in the er mode 24 Full sequence ignition device 25 FUNUN oris o Rute Roseto aet 25 Checks eee eee eee eee es 25 Removal 4er Et edna 25 Ignition and control sequence 26 11 11 1 11 2 11 3 11 4 11 5 11 6 12 12 1 12 2 12 3 13 13 1 13 2 13 3 13 4 14 14 1 14 2 14 3 14 4 14 5 14 6 15 15 1 15 2 15 3 16 16 1 16 2 17 17 1 17 2 17 3 17 4 17 5 18 18 1 18 2 18 3 19 19 1 19 3 20 Modulating gas valve 27 F nctlon x ERAT EE IV 27 Nomenclature of the parts 27 Adjustment 27 Checks eI m e inawa 28 Removal of the on off operators coils 28 Removal of the gas valve 28 Primary

SERVICE MANUAL RIVA PLUS M90D.24S M90D.28S M90D.24SR

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