Service manual - free boiler manuals
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1. anjea ssed Ag eqoud NEN T DE N A N aramon 78 osje ees g sy jue pue eui jo sseupunos 20 eui pexons jou s 526 yeu ens 2 ue pue seoueJeojo eos pej eisur si euru 99 yeu suononuisqo eouesqe pue sseupunos JO Y29949 dois uonisod adid Ajddns jo sseupunos eui N Ene 1 emm S S UOIIMS UN ____ gt le yeay N N Hcc uonoeuuoo pue Ajuejod 42949 Sesnj jeuje1xe pue ejqeo Ajddns jo eui AeA N reaneu pue 1 10 0940 L 6 uonoes 995 51460 uone 4 eoueijdde jeondo 991 5 HO SI 4Jejjoq eui j9jes y WO sye y o uo Ajayes ay S4eo ayes MO u o 102. 12 Removal 12 Pump cns es makes 13 FUNCTION e ep EARN 13 27 aed ei A IR A 13 Removal 13 Three way diverter valve 15 FUNCOM s eor PELLEM PHRASE 15 Checka due ovde e raids eee dread E 15 Removal of the electric actuator 15 Removal of the diverter group and its internal parts 16 Electronic control ignition p c b 17 F nctlonzz sole ee DEED 17 Selection and adjustment devices 17 Checking the temperature 18 Operation lights 19 Setting the boiler control function modes 19 Adjustment of maximum useful output in c h mode 20 Reignition frequency setting 20 Combi C H only mode setting 21 Checks ici en Earn 22 Removal of the electronic control p c b 22 Thermal control in the gt mode 24 Thermal control in the n mode 25 Transformer 26 Removal 26 Check the transformer 26 Gas valve ea a 27 EUnctlOn ias s IS ERR an XS 27 Description of the parts 27 12 3 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 15 4 16 16 1 16 2 17 17 1 17 2 18 18 1 18 2 18 3 18 4 18 5 18 6 18 7 19 19 1 19 2 19 3
3. U o UU ao SESS LD4 SB1 AT ll o g Transformer Fan Main circuit thermostat pressure switch uo Wo UO 110Us 104 91461 941 Wo uo 4 941 awel jo eu uo 1529 qou jueunsn pe dwe eui Buruan eanje1eduje N Wp eui o4uoo 1 useop 941 UIn US OPp Ww up JO o Ul JOULE 1961 1juseop 941 suin ue4 W up JO o ui JOULE 1961 1 941 IIS ue4 330 1461 eu wp Jo ui Jeuye JOU seop eu L ureBe sXoo Jejoq eui pue uo syfi 941 ejoAo eui 15 eui usnd 19591 eui Ag 5900 pue uo 1 useop 941 ejoAo eui syeys Jejoq eui uopnq ysnd 19591 eui Ag 100 Sejejedo pue uo suuni Jejloq eui usnd 19591 eui Ag 1 syoyoesq enueui y jo uonoes zu aons __ m f 1 gu LU umeesomemeama m mmm eean a
4. hae z 31 2 p SUO o 4 J wh bk f 15 EL C rab X16 e a wh when TS z L5 gt E o e m E X15 8 ios X6 Ira a Lez 3 x pl Leto eS bu bn bu bn HESS e HBE qum to d i bu 5 x2 bn X24 Beal wh 8 LD3 102 L F sd 124 E O bn bn bu bu bn bu bk bul xt cle ia Fo 29 i OM Sx 9 0 rd ae Primary circuit Transformer og wh bk flow switch 230V 24V wh Fan gy bn brown bu blue Ignition Flame detection bk black electrodes electrode gy Flue Safety wh white temperature thermostat red probe NTC gy grey gy 4 gn green ye yellow vt violet M wh orange gnye green yellow Safety rdwh red white thermal fuse Diagrams Circuit voltages during c h or d h w operation Electrical voltages with burner on C 2 only during c h operation Ql during d h w operation 3 D h w diverter valve Flow switch 230 Gas valve 0 Supply network d g 9 N x12 4 s Me X11 X10 X7 X17 F2 Ft ig g g x3 ere 15 lt z 23 X6 S Je X1
5. 5 j mex Jg 0 Do mea ___ Des 0 5 mene 0 wm poche d o pti momoa wn Ce p oso Ee i _ meo pe Becken f Hot UBL l1 500 wu A id wwe 5 j uoniu N le yeay cS yoayo sjueuodujo5 DIL o sme ur 54 Bc tlo y 1 useop 941 QV L ayes ues ui ayes yy 00 9 SenjeA Jedoud 10j y 0 1 uoisuedxe y JO uonezunsse4d eui 42049 Bugjes seb y JO en eA e S siu seseb eui 02 991 2990 7 y y jo BU pue urew y jo eui esneo ssed ee oo omemdenmedunena epoupeje uonoejeq uoniub
6. stop circulator 3min Is primary circuit NO Operation lights temperature higher than that selected Main circuit pressure Switch consense YES YES YES NO lock memorised cancels lock starts fan checks fan rpm Operation lights Sr NO Is fan rpm YES lt temperature higher than 110 C NO o exact 1 turns on lock out light YES Ya Opeartion lights o o es beginning of wait period YES flame presence End of wait period NO starts ignition discharges Opens gas valve flame presence beginning of ignition period interrupts ignition discharges gas valve open fan runs closes gas valve YES stops fan interrupts ignition discharges memorizes lock turns on lock out light End of ignition period m NO Is fan rpm NO reset push button YES exact pressed Safety thermostat or flue NO temperature probe lock out YES flame presence NO e YES Fig 9 20 24 Electronic control ignition p c b Thermal control in the x mode Switch in theses function mode See functioning with the function Taking control in they mode lt YES water from the domestic ho water circuit Request for heat from room thermostat NO circulator off fan still NO sec 9 11
7. T TTE 8E I 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 C Fig 15 1 On the boiler there are two Temperature probes One on the output of the primary condensing heat ex changer c h Temperature probe A in Fig 15 2 and Fig 15 3 one on the output of the d h w heat ex changer d h w Temperature probe B in Fig 15 2 and Fig 15 3 N d d h w d h w return flow inlet outlet c h c h Fig 15 2 34 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 pipe near the Tempera ture probe and check the electrical resistance accord ing to the graph in Fig 15 1 Removal of the c h Temperature probe 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 Empty the primary circuit of the boiler 3 Remove the electric connector C and unscrew the c h Temperature probe A Fig 15 3 Fig 15 4 4 Reassemble the c h Temperature probe carrying out the removal operations in reverse order Fig 15 4 Temperature probe Removal of the d h w Temperature probe 3 Remove the electric connector D and unscrew the d h w Temperatu
8. The following procedure allows the output of the boiler for c h to be limited to meet the system requirement Adjusting the maximum useful output in c h mode does not prevent the boiler firing at maximum rate for d h w production 1 Turn the boiler ON positioning the function selec tor knob A as indicated in Fig 9 6 Fig 9 6 2 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 3 The lamps E should give the indication as in Fig 9 7 maximum c h useful output adjust ment If not press the reset button repeatedly to obtain it o wee Lamp OFF LJ 00 0 Lamp on Fig 9 7 At this step it is possible to visualize the current setting by keeping the reset button C pressed for more than 5 seconds The lamps will flash a number of times corre sponding to the setting Tab 9 1 and Fig 9 8 4 To change the setting turn the knob B on a posi tion corresponding to the desired maximum use ful output Tab 9 1 and Fig 9 8 By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indicating that the setting has changed and must be memo rised 20 Maximum useful output in c h mode non condensing kW BTU h 110 24 110 32 1108 2458 5 8 19 789 8 2 27 977 9 0 30 707 12 4 42 307 12 2 41 625 16 5 b6 296 15 5 52 884 20 7 70 626 18 7 63 802 24 8 84 614 21 9 74 720 2
9. 20 20 1 20 2 20 3 21 21 1 21 2 21 3 22 Adjustment 0 27 Cheeks m teat 28 Removal of the gas valve 28 Primary circuit flow switch 30 PUCHO i Bead at 30 Checks 30 Removal 30 Expansion vessel and temperature pressure gauge 31 FUNCOM sace mctu 31 Checks us assa ee e ae eve 31 Removal of the expansion vessel 31 Removal of the temperature pressure gauge o inge e da 31 D h w flow switch filter and flow limiter 32 E rictlori eee en ast 32 Description and location of parts 32 Checks 32 Removal of the sensor 32 Removal of the flow switch group and d h w circuit filter 32 Flow limiter 32 Temperature probe 34 FUNCION eee PIS Dee 34 s 3 Grice eee 34 Removal of the c h Temperature probe 34 Removal of the d h w Temperature probe 35 By pass valve 36 FUNCHION asi E Redux 36 Removal 36 Fan and Air box 37 PUNCUON reine sa dida iet cabe ds 37 Removal of the Air box and the Fan 37 Ignition and detection electrodes burner and spark generator 38 FUNCION estote rex OE AR HR 38 Removal of the Ignition and
10. Wall hung fan flue room sealed high efficiency gas boiler Service manual RIVA ADVANCE HE Models G C Appl No 1108 245 47 583 11 1108 325 47 583 12 M110B 24SR C 41 580 07 Leave this manual adjacent to the gas meter ev recommended Table of contents 1 1 1 1 2 2 2 1 2 2 2 3 2 4 2 5 2 6 3 3 1 3 2 3 3 4 5 5 1 5 2 5 3 6 6 1 6 2 7 7 1 7 2 7 3 8 8 1 8 2 8 3 8 4 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 8 9 9 9 10 9 11 9 12 10 10 1 10 2 11 11 1 11 2 Overall information 1 Overall View 1 Hydraulic diagram 1 General access and emptying hydraulic disi 22 este ee cre ie sel a gee 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 4 Diagrams 5 Wiring diagram 1108 245 M110B 32SM 5 Wiring diagram 110 24 6 Circuit voltages 7 Fault finding 8 Condensing heat exchanger 10 Function Ret Ra 10 Removal 10 Cleaning 11 D h w heat exchanger 12 F nctlon sco E a
11. 20 1 Fig 20 2 is also connected in series with the Flue temperature probe NTC and acts as a safety device in extreme case of in correct operation of the Flue temperature control sys tem Reaching the breakdown temperature it opens the cir cuit and locks out the boiler In case of intervention of this safety device the heat ex changer part shown in Fig 20 3 may be damaged and must be replaced Fig 20 3 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 connector C from the Flue tem perature probe NTC by pressing the plastic hook placed on the side of the connector 3 Unscrew and remove the flue temperature probe A Fig 20 2 from the condensing heat ex changer 4 Assemble the Flue temperature probe NTC carry ing out the removal operations in reverse se quence Checks Overheat temperature value 1 Set 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 of the Flue temperature probe NTC and no overheat intervention should occur Temperature resistance relationship 1 Remove the Flue temperature probe NTC see section 20 2 2 Meas
12. Open circuit rd red 9 4 Kohm bk black 5 wh white 5 gt Q Fig 8 3 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 8 4 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 8 2 Fig 8 3 or to the wiring diagram in section 8 2 for the correct wiring connection 15 Three way diverter valve Fig 8 4 Removal of the diverter group and its internal parts Remove the front and both side case panels Empty the primary circuit and the d h w circuit of the boiler Remove the electric actuator see section 8 3 Remove the fixing spring F Fig 8 5 and remove the primary circuit flow switch G Disconnect both c h and d h w temperature probe respectively H and Unscrew the connector J the c h flow connector and the d h w outlet connector Fig 8 5 7 Remove the d h w heat exchanger see section 6 2 8 Remove the fork and move away the pipe L Fig 8 6 9 Unscrew the screw M and remove the diverter 16 group Fig 8 6 Rear view of the boiler Refer to the exploded view in Fig 8 7 to remove the internal parts of
13. circulator on YES stop circulator 3min Is primary circuit Operation lights temperature higher than that selected Main circuit pressure Switch consense YES YES ideo NO YES NO lock memorised cancels lock Opeartion lights 15 fan rpm exact temperature higher than 110 C NO NO 1 turns on lock out light YES Opeartion lights beginning of wait period YES flame presence End of wait period NO starts ignition discharges Opens gas valve flame presence beginning of ignition period interrupts ignition discharges gas valve open fan runs closes gas valve YES stops fan interrupts ignition discharges memorizes lock turns on lock out light End of ignition period Is fan rpm NO reset push button YES exact pressed Safety thermostat or flue NO YES flame presence NO 3j temperature probe lock out Fig 9 21 25 10 Transformer Removal Fig 10 1 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 see section 2 26 2 Disconnect the four connectors A 3 Unscrew the screws B and Transformer C by sliding it forward 4 Reassembl
14. electrodes B and the detection electrode D Fig 18 1 4 Assemble the Ignition and detection electrodes carrying out the removal operation in reverse or der When reassembling the ignition electrodes be sure to connect correctly the wires to the spark genera tor see Fig 18 3 Gs earth wire E d ignition electrodes wire Fig 18 3 Removal of the burner NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Remove the air box and the fan see section 17 2 2 Remove the Ignition and detection electrodes see section 18 2 Ignition and detection electrodes 3 Unscrew the screws J Fig 18 1 and remove the cover of the combustion chamber 4 Unscrew the screws Fig 18 1 and remove the Air gas duct lid 5 Remove the burner by sliding it forward burner gasket locating tab Fig 18 4 6 Assemble the burner carrying out the removal operation in reverse order Ensure the burner is correctly located by lining up the locating tab Fig 18 4 burner gasket Air gas duct gasket Fig 18 5 Before reassembling ensure the burner gasket is correctly located 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 man
15. temp Control heat exchanger probe panel Hydraulic diagram Central heating c h operation Domestic hot water d h w operation 5 Z E THF m V f C h C h D h w D h w water return water flow inlet outlet 2 General access and emptying hydraulic circuits Nomenclature Fig 2 1 Right side panel Front panel Control panel lid Control panel cover Service panel oa rR OON Left side panel 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 2 lift the panel and remove it Fig 2 2 To remove the side panels loosen the screws B and C Fig 2 3 bring the base of the panels away from the boiler and lift them freeing them from the top hooks Fig 2 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 1 Remove the f
16. wards and remove the flexible pipe C 4 Unscrew the screw D and remove the trap 5 Unscrew the lock nut E and separate the trap from its bracket 6 Reassemble carrying out the removal operations in reverse order Fig 21 2 45 22 Short spare parts list eal Description Q ty Manufac Manufacturer s reference turer part no lis 688 Burner mod M110B 24SM M110B 24SR 1811293 100 H58 689 Burner mod M110B 32SM 1293 101 3 58 659 Condensing heat exchanger mod 1 811432 100 M110B 24SM 1108 2458 58 660 Condensing heat exchanger mod 1 811432 101 M110B 32SM eee 8283105 EBM RG128 24V 54W 5 H58 694 Gas vave EI SIT 848 Sigma uo 189 Se valve 181 100 Watts Orkly alternative 717 Electronic regulation p c b 2 1955 100 Bertelli amp Partners pomo 108 245 M110B 58 718 Electronic regulation p c b i 811955 101 M110B 32SM E01 205 D h w heat exchanger M110B 24SM BH001102 05 161 D h w heat exchanger M110B 32SM 161100 s Fee A H32 555 Primary circuit flow switch 1251 501 Po 169 010 D h w flow switch 107 E00 688 Main flow switch membrane 81011 103 Po E83 086 Three way diverter valve electric actuator 1101 102 H58 661 Flue temperature probe NTC 81432 102 Fase 164 026 Temperature probe ma
17. 24 Read the COs value It should be between 9 0 and 9 8 96 natural gas G20 or between 10 0 and 11 0 6 LPG G31 To adjust the CO value rotate screw 1 Fig 11 2 by rotating it clockwise the CO 96 de creases 25 Switch off the boiler and turn off the hot water tap s 26 Close the air flue sampling points 27 After adjustment fit the protective brass plug 2 Fig 11 2 Important after the gas pressure checks and any adjustment operations all of the test points must be sealed UEN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Check the on off operators coils Remove the front panel of the case Disconnect the electrical connector 4 Fig 11 2 Measure the electrical resistance between the connector pins of the on off operators as illus trated in Fig 11 8 ON OFF Operator approx 6 400 ON OFF Operator approx 920 Q at ambient temperature Fig 11 8 IE 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 and the sealed chamber lid 2 Remove the screw G and disconnect the con nector H Fig 11 9 Gas valve Fig 11 9 3 Turn off the gas supply and disconnect the gas isolation cock connector from the inlet port of the gas
18. Fig 17 1 is to force the mix ture of air and gas into the burner The function of the Air box B is to mix the gas and the air in the right proportion The flow rate of the air gas mixture and consequently the input power ofthe boiler is proportional to the speed of the fan that is controlled by the electronic control p c b A 20 1 Fig 17 1 Removal of the Air box and the Fan NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Turn off the gas supply 2 Remove all the case panels and the sealed chamber lid see section 2 Fig 17 2 3 Disconnect the air manifold C Fig 17 2 by pul Fan gasket Fig 17 3 4 Disconnect the rubber pipe D Fig 17 3 5 Ro Fig 17 4 5 Unscrew the gas connector Fig 17 4 6 Remove the fixing fork F and remove the gas pipe G Fig 17 3 7 Loosen without removing the screw H 8 Remove the screws and the air box J Leave the air box with the air manifold clamped to the water pipe 9 Disconnect the fan connector K by pressing the plastic hook placed on the side of the connec
19. To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously At this point only the right green light flashes 13 Toreset the boiler to the normal operation turn it OFF and ON by the function selector knob A CE Checks Check that fuses are complete If the Electronic control ignition p c b does not supply any device pump fan etc check that the fuses 2 and 3 Fig 9 2 are complete If afuse has blown replace it with one that has the same characteristics after having identified the reason for fail ure Lock sequence Start the boiler until the burner is ignited With the burner firing interrupt the gas supply The Electronic control ignition p c b must carry out four complete ignition cycles and then after about 4 min utes goes to lock out state By turning the boiler on and off by means of the function switch the device must not unlock and the burner must not turn on 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 When replacing the Electronic control ignition p c b it is advisable to go through the setting modes of the boiler here described in sections 9 5 to 9 7 The spare electronic control ignition p c b is set for natural gas If the boiler is fed with different gas type go through the Gas conversion operations describ
20. and the sealed chamber lid Ignition and detection electrodes 2 Check for the integrity of the insulation of wires which connect the electrodes to the spark gener ator and to the control ignition p c b Warning Insulation panels material handling care Mineral fibres are used in this appliance for the insula tion panels of the combustion chamber Excessive exposure to these materials may cause tem porary irritation to eyes skin and respiratory tract Known hazards Some people can suffer reddening and itching of the skin Fibre entry into the eye will cause foreign body irritation which can cause severe irritation to people wearing contact lenses Irritation to respiratory tract Precautions Dust goggles will protect eyes People with a history of skin complaints may be particularly susceptible to irritation High dust levels are only likely to arise following harsh abrasion In general normal handling and use will not present high risk follow good hygiene practices wash hands before touching eyes consuming food drinking or using the toilet First aid Medical attention must be sought following eye contact or prolonged reddening of the skin 41 19 Safety thermostat HAN Function The safety thermostat A in Fig 19 1 is a device that senses the temperature of the primary circuit water which flows in the outlet pipe of the condensing heat ex changer If the temperature control system of the b
21. bn bn bu bu bn bu bk bul rd UELUT x a i 8 o rd 5 OM ox rd Primary circuit Transformer og wh bk flow switch 230V 24V wh Fan gy bn brown bu blue Ignition Flame detection bk black electrodes electrode gy Flue Safety e MG temperature thermostat rd 3 9y grey probe NTC y Time switch gn green yellow vt violet M wh orange gnye Safety rdwh red white thermal fuse Diagrams Wiring diagram M110B 24SR Electric supply terminal block LON External controls terminal block bn gnye bu 3 2 1 000 bu bk bn n d U Pump gnye bu Gas valve C h temperature probe NT bn bn bu bk bu bu bn Fu u e e EXER EA geli 59 X7 a X17 gts IS F2 Ft eal 3
22. valve 4 Using pliers remove the spring and the rubber pipe J Fig 11 9 Fig 11 10 5 Unscrew the connector K Fig 11 9 remove the fixing fork L and remove the pipe M Fig 11 10 Fig 11 11 6 Unscrew the screws N and remove the valve Fig 11 11 7 Reassemble the valve carrying out the removal operations in reverse order Before to fit a new valve it is advisable to set it as hereafter explained 8 Remove the brass plug and turn the plastic screw inside it fully clockwise until it stops Do not over tight 9 Turn it counter clockwise 2 and 3 4 turns 10 Agjustthe gas valve using the flue analyser as de scribed in section 11 3 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 it is deemed necessary to undertake a combustion analysis as detailed in chapter 11 3 section 11 29 12 Primary circuit flow switch EAN Function The Primary circuit flow switch A in Fig 12 1 function is to detect water flow rate through the primary hy draulic circuit of the boiler p 2 NA N Fig 12 1 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 fai
23. 0d 6 uo 100d Jeioq ASION 1994109u epoul uo poeu100 941 1 y o eui pue 2 06 OU Jo eunjejeduue eui u o Wwup Buunp u o ui au Wu p Ajddns jou saop 941 1no 3201 t Maans qun NJ N LS IL syayoesq enueui y jo 5 Condensing heat exchanger ESM Function The Condensing heat exchanger A in Fig 5 1 has the function of transferring heat produced from combus tion of the gas and from the flue exhausted gas to the water circulating in it n A A Fig 5 1 By reducing the combustion products temperature the latent heat of the vapour is transferred to the water cir cuit allowing an extra gain of useful heat The condensed vapour is then drained through the condensate trap B and the draining pipe C Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Disconnect the flue system from the boiler 2 Remove the fan group rubber pipe gas pipe fol lowing the instructions from 1 to 6 in
24. 13 connector remote control optional 11 x2connector timer 12 Lock out signal lamp 13 Boiler reset button 14 Function control C h temperature adjustment 15 x22 connector fan 16 x24 connector transformer 17 D h w temperature adjustment 18 5 connector transformer 19 Appliance operation lights Checking the temperature The Electronic control ignition p c b makes it possible to separately adjust the c h water flow temperature and d h w outlet temperature oa 5 WO PD 18 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 14 and 17 in Fig 9 2 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 9 3 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 com parison operates the fan speed thus regulating the gas flow rate and consequently changing the useful output of the bo
25. 9 0 98 944 25 1 85 638 33 1 112 933 5 4 2 C6 1 7 bt B Fig 9 8 5 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 6 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A In any case the boiler automatically resets to its nor mal operation after 10 minutes Reignition frequency setting Itis possible to select the minimum time that must pass between two ignitions of the burner in c h function mode 1 Turn the boiler ON positioning the function selec tor knob A as indicated in Fig 9 9 E B A C D Fig 9 9 2 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 3 The lamps E should give the indication as in Fig 9 10 reignition frequency If not press the reset button repeatealy to obtain it O O Wher Lamp OFF LI UD Ol Lamp On Fig 9 10 At this step it is possible to visualize the current setting by keeping the reset button C pressed for more than 5 Electronic control ignition p c b seconds The lamps will flash a number of times corre sponding to the setting Fig 9 11 4 To change the setting turn the knob B on a posi tion corresponding to the desired delay By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indicating that the setting has cha
26. Fig 9 19 reaches the potentiometer edge It is not necessary to force them in the knob 10 While tightening the screws that fix the Electronic control ignition p c b on the control panel keep the p c b towards the control panel fascia mak ing sure of the contact between the boiler reset button B and the tab C Fig 9 19 Electronic control ignition p c b Attention After installing the Electronic control ignition p c b 11 12 13 Make sure the c h and d h w A tem perature adjustment knobs can move freely for the complete range If not remove the spindle again as described at step 3 turn the knob half a turn and re insert the spindle Make sure that the settings comply with the in dications given in section 9 5 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 23 Electronic control ignition p c b Thermal control in the 3 mode Switch in function mode NO circulator off fan still YES _ Taking water from the domestic ho water circuit YES circulator on
27. closes the electric contact Fig 14 2 Description and location of parts Fig 14 3 Flow switch plug O ring Flow limiter M110B 32SM optional accessory Body Float Filter Sensor holder spring Sensor AN Oa C5 Fig 14 3 EEN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Sensor operation Remove the front panel of the case Measure the electrical resistance at the leads of the sensor Without water being drawn the con tact must be open By opening a hot water tap the contact must be close electrical resistance zero Q Removal of the sensor NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case 2 Disconnect the connectors and remove the sensor holder spring C Fig 14 2 3 Remove the sensor IX Removal of the flow switch group and d h w circuit filter NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case and empty the d h w circuit 2 Remove the sensor see section 14 4 3 Remove the fork D and pull up the flow switch plug 1 with the help of a screwdriver 4 To remove the filter from the flow switch group separate the filter 6 from the body 4 Fig 14 3 by levering it 5 Reassembl
28. connect the switch Re assemble the parts in reverse order of re moval Refer to Fig 12 3 for the correct wiring connectors 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 2 Remove the fork C that holds the micro switch housing D Fig 12 4 Fig 12 4 Primary circuit flow switch 3 Unscrew the four screws E see Fig 12 5 open the hydraulic operator and remove the mem brane F Fig 12 5 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 12 5 13 Expansion vessel and temperature pressure gauge Function The Expansion vessel in Fig 12 1 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 13 1 from the valve on the top of the expansion vessel and con nect a suitable air pressure gauge Fig 13 1 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 the
29. ction faulty detection electrode its wiring or connection Faulty condensate drainage Faulty gas valve faulty on off operators or not electrically supplied Faulty Electronic control ignition p c b Other components like the primary circuit flow switch can temporarily stop the ignition of the burner but allow its ignition when the cause of the intervention has stopped Fig 9 20 and Fig 9 21 show the sequence of the oper ations that are carried out at the start of every ignition cycle and during normal functioning CENE Selection and adjustment devices On the Electronic control ignition p c b several selec tion adjustment and protection devices are located Fig 9 2 Some of these devices are directly accessible by the user function control temperature adjustment poten 17 Ci cuo uox OUO o Electronic control ignition p c b tiometers etc others like the fuses are accessible by removing the service panel 19 18 17 16 5 14 13 12 1 Fig 9 2 1 x7 connector electric supply terminal block and external controls terminal block Fuse F1 F2 3 15 AF Fuse F3 400 mA T x12 connector pump and 3way diverter valve x17 connector gas valve X14 connector external temperature probe optional 7 x9 connector safety thermostat flue tempera ture probe NTC c h temperature probe NTC 8 x11 connector d h w temperature probe 9 x10 connector d h w flow switch 10 x
30. ctor coming from the control p c b the electrodes wire and the earth wire coming from the ignition elec trodes Fig 18 8 ignition electrodes earth wire wire amp S Lc P EN C 2 spark generator connector Fig 18 8 3 Unscrew the screws O and remove the spark generator 4 Assemble the spark generator carrying out the re operation in reverse order When reassembling the spark generator be sure to connect correctly the wires Checks Check of the spark generator NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 40 There is not a significant way to verify the integrity ofthe spark generator When the fan turns the burner does not light a poss ible cause is a faulty spark generator and it is advisable to replace it to locate the fault 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 the ignition electrodes see section 18 2 2 Check for the correct distance between the me tallic edges of the ignition electrode see Fig 18 9 Fig 18 10 3 5 mm earth electrode Ignition electrode Fig 18 9 the connection wires Fig 18 10 NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels
31. 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 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 supply before removing any covering or component Remove the front and right hand side case pan els Empty the primary circuit of the boiler Extract and lower the control panel Disconnect the connector B Fig 7 2 Fig 7 3 Loosen the connection C and pull up and turn to the left the pipe D 6 C h only model remove the fork and remove pressure gauge connection F Fig 7 3 7 C h only model remove the fork G loosen the connection H and remove the pipe Fig 7 3 Fig 7 3 c h only model 8 Remove the locking plate J 13 9 Unscrew the two screws K that hold the pump on the frame and remove the pump Reassemble the pump carrying out the removal oper ations in the reverse order When r
32. detection electrodes 38 Removal of the burner 38 Removal of the front insulation panel 39 Removal of the rear insulation 39 Removal of the spark generator 40 Checks usas mea ate ees 40 Safety thermostat 42 FUNCOM coo 42 CHECKS led eR ARR 42 Removal 42 Flue temperature probe NTC and Safety thermal fuse 43 F nctlon cu o cde cemere so alae ax 43 Removal 43 GHECKS n e ese DEUS CERTE 43 Condensate trap 45 FUNCIONS d esos vig oe ebd 45 Check the cleanness of the trap 45 Removal 45 Short spare parts list 46 1 Overall information IB Overall view Flue temperature probe NTC Safety thermal fuse Condensing exchanger air B Condensing purger valve LEES R a exchanger Burner j Ignition i x Expansion 1 electrodes vessel Detection ETAY Spark electrode 4 yy Generator x r Air box Transformer thermostat 0 0 d Gas restrictor Fan C h pressure relief valve Air hose Automatic Ss air purger Diverter valve LEN uoc valve TH Zr D h w Flow Cod S Switch odensate d trap di EY ___ Pump Kx cud C h temp 76 PM 1 NN probe Gas valve eri Main circuit flow switch T D h w D h w
33. e the Transformer carrying out the re moval operations in the reverse order remove the After reassembling ensure the wires are correctly connected see Fig 10 2 clamp for fitting the transformer ag smaller FA larger connector connector smaller larger connector connector Fig 10 2 Check the transformer NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the Transformer see section 10 1 2 Measure the electrical resistance of the primary and secondary windings The primary should have a resistance approx 35 ohm and the secondary approx 1 4 ohm 11 Gas valve Function The Gas valve A in Fig 11 1 controls the gas inflow to the boiler burner BS S a JA A p Fig 11 1 By means of an electric command given to the on off operators the passage ofthe gas through the Gas valve can be opened or closed Description of the parts Fig 11 2 Maximum gas pressure adjustment Minimum gas pressure adjustment On off operators On off operators electric connector A N gt Gas valve inlet pressure tes
34. e the parts following the removing se quence in reverse order EX Flow limiter The M110B 24SM model is factory fitted with a 10 litre min flow limiter D h w flow switch filter and flow limiter If on the 1108 325 model the flow rate of the d h w circuit is too high itis possible to limit it by instal ling a flow limiter The following sizes are available Nominal flow rate litres min Colour To install the flow limiter 1 Remove the flow switch group as explained in the section 14 5 2 Separate the flow switch plug 1 from the body 4 levering with a screwdriver one of the two hooks Fig 14 4 3 Insert the flow limiter 3 as shown in Fig 14 3 4 Reassemble the group following the above se quence in reverse order 33 15 Temperature probe 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 15 1 Q 12500 e ee a FR LEER EN oo Ep 3 neo Tp Twp peste pp ET eo v REN EE ER EE E E ET RE E E ER seo A DM EE ERES E REN BER EN DERE PE d BRENT FEST E D ERE IER EI ERE RE RR EE SR EP GE ES ERR ER c ek E i ER 5 n
35. eassembling the pump check the correct location of the O ring gasket 14 in the inlet port of the pump that seals the connection between the pump and the plastic group 8 Three way diverter valve ESM Function The diverter valve A Fig 8 1 has the function of mod ifying 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 gt DA m V Fig 8 1 Checks Check the electrical continuity Fig 8 2 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 8 3 indicates the relationship between the electric command coming from the electronic control p c b and the position ofthe 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 Bo e 9 4 Kohm rd red Open circuit a bk black lt wh white E gt o e N Fig 8 2 D h w mode gt B Spindle B visible Ee 1 D N
36. ed in the In stallation manual If an external temperature probe optional is fitted the coefficient K has also to be set as described in the Commissioning chapter of the installation man ual 22 1 Gain access to the parts located inside the con trol panel as explained in the section 2 3 of this manual 2 Remove all the wiring connected to the Electronic control ignition p c b To disconnect the connectors 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 9 18 Fig 9 18 4 Unscrew the four screws that hold the Electronic control ignition p c b on to the control panel 5 Remove it by lifting its rear edge and freeing it from any of the wiring 6 Re assemble the Electronic control ignition p c b following the removal procedures in the re verse order Important When re assembling the Electronic control ignition p c b 7 It is not necessary to utilise static protections but it is advisable to ensure that the pcb is handled with care and held atthe edges and with clean dry hands 8 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 9 Insert the spindles in the control panel knobs until the notch A
37. er switching on the fused spur isolation switch 13 Open the gas inlet valve 14 Setthe function knob B as indicated in Fig 11 4 The appliance operation light on the left will flash every 4 seconds 27 Gas valve Fig 11 4 15 Keep pressed the reset button for about 10 seconds Fig 11 4 until the lock out signal lamp D blinks 16 The lamps E should give the indication as in Fig 11 5 Wher Lamp OFF O00 000 Lampon Fig 11 5 17 Release and keep the reset button C pressed for more than 5 seconds until the lock out signal lamp D is switched off The boiler will now go through an ignition se quence and the burner will light 18 Open least one hot water tap fully Adjusting minimum gas valve setting 19 Set the knob F to the minimum position as illus trated in Fig 11 6 Fig 11 6 20 Allow the analyser to give a stable reading 21 Read the COs value It should be between 9 0 and 9 8 natural gas G20 between 10 0 and 11 0 LPG G31 To adjust the CO value remove the brass plug by unscrewing it and rotate the Allen key screw 4 mm 2 Fig 11 2 by rotating it clockwise the CO increases Checking the maximum gas valve setting 22 Setthe knob F to the maximum position as illus trated in Fig 11 7 28 Fig 11 7 23 Allow the analyser to give a stable reading
38. ich hold the overheat thermostat on the pipe of the condensing heat ex changer and remove it Fig 19 2 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 if it deemed necessary to undertake a combustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 20 Flue temperature probe NTC and Safety thermal fuse ETE Function The Flue temperature probe NTC A in Fig 20 1 and Fig 20 2 senses the temperature of the combustion products that flow through the condensing heat ex changer s 7 B OY m uh m V Fig 20 1 If the temperature of the combustion products circuit reaches the limit temperature the Flue temperature probe NTC reduces the gas flow rate to the burner The temperature of the combustion products should de crease to a safe value temperature In the case that the temperature of the combustion products reaches a potentially dangerous value it stops the boiler operation lock out This allows the use of plastic materials for the flue outlet pipes and bends The use of kits different from the original isn t however allowed since the flue pipes are integral parts of the boiler Fig 20 2 A Safety thermal fuse B in Fig
39. iler gt ccr r H em V NV m AA Sp _ Fig 9 3 When the boiler functions in d h w Fig 9 4 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 bes Electronic control ignition p c b Fig 9 4 Normally the result of the comparison between these two signals directly operates the fan speed 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 90 C the useful output is automatically reduced so that the primary circuit can not reach excessive temperatures The control sequences in uk function and in 3 func tion are illustrated in detail in sections 9 11 and 9 12 Operation lights The Electronic control ignition p c b is provided with three lamps L E D indicators 19 in Fig 9 2 that give optical information during the operation of the boiler The green lamp on the left gives information whether the boiler is in stand mode or during the normal operation of the boiler The following table gives the relationship between the lamps indication and their meaning Boiler in stand by condition function control in 9 position Anti freeze system active Boiler ON c
40. in or D h w circuit 1001 117 H58 680 Ignition electrode 81293 102 E83 145 Temperature pressure gauge 81475 108 IMIT 46 Short spare parts list 20 19 x 47 17962 1340 2 2008 5244 UK Biasi UK Ltd Newman Park Western Way Wednesbury WS10 7BJ Sales Tel No 0121 506 1340 Sales Fax No 0121 506 1360 Service Tel No 0121 506 1350 Service Fax No 0121 506 1370 www biasi co uk
41. l access and emptying hydraulic circuits Fig 2 10 Emptying the d h w circuit 6 Close the d c w inlet cock K Fig 2 7 7 Open one or more hot water taps until the boiler Fig 2 9 has been completely emptied 3 Diagrams Wiring diagram M110B 24SM M110B 32SM Electric supply Three way terminal block diverter valve D h w temperature probe NTC LON C h temperature External controls probe NTC terminal block WE 3 Gas valve bu bngnyebu 3 2 1 Pump MES D h w flow switch bu gnye bu n AD uh wh bu bn rd wh bk bk rd bu T ee xia 5 7 i EER xu bloo X11 X10 X7 a X17 lt 22 Ft e J Q o e 2 Sule A e EL X3 S K wh bk 2 E f x16 2 ESO af ow wh when a Ly 15 8 w gt X6 Fa B c els bu bn bu bn Hoes b 2 bn e x24 ES wh LD3 E Li Ra ak 25 n H
42. lure 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 EEN Checks NN 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 lever B referring to Fig 12 2 30 Boiler OFF B Fig 12 2 Boiler ON Electrical check It is possible to 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 NO TAG 2 Measure the electrical resistance between the tabs marked and N O Fig 12 3 The contact must be normally open 3 Operate the switch by hand and verify that the contact is now closed No X do not use Fig 12 3 EEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Removal of the switch Remove the front panel of the case Remove the fork C Fig 12 4 Open the box and dis
43. nged and must be memo rised 4 3 A 5 1 2 3 5 1124 Ni Ex 7 NO 0 n P E rea 81 2 Tj X 00 000 Delay minutes Setting No Fig 9 11 5 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 6 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A In any case the boiler automatically resets to its nor mal operation after 10 minutes Factory setting 3 minutes Combi only mode setting Two different options are available on the Electronic control ignition p c b and proper setting must be done after a replacement of the p c b 1 Remove the front panel of the case 2 Turn ON the power supply Lamps E give the in dication as in Fig 9 12 uly DEP o Where Lamp OFF 0 00 00 Pa Lamp Flashing Fig 9 12 3 Position the function selector A as in NO TAG and disconnect the C h temperature probe 4 Keep pressed the reset button C for about 10 sec onds Fig 9 13 until the lock out signal lamp D blinks 5 Connect the c h temperature probe 6 Press the reset button C repeatedly 2 times until the lamps E give the indication as in Fig 9 14 boiler mode Lamp OFF C 00 000 o Lamp ON Fig 9 14 At this step it is possible to visualize the current setting by keeping the reset button C pressed for more than 5 sec
44. oiler 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 v S T A 4 V Fig 19 1 EEJ Checks Overheat temperature value 1 Set the temperature control knobs to their max position and run the boiler in d h w and c h 2 Allow the boiler to reach its maximum operating temperature monitor the temperature gauge on the instrument panel The boiler should maintain a temperature below that of the safety thermostat and no overheat intervention should occur NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 42 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 contact must be closed electrical resistance zero Q HEN 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 Disconnect the wiring B detail in Fig 19 2 3 Unscrew the screws C wh
45. ol ignition p c b receives inlet information coming from the boiler the sensors or from the outside knobs room thermostat etc pro cesses it and consequently acts with outlet commands on other components of the boiler Fig 9 1 The Electronic control ignition p c b is also a full se quence ignition device and does a sequence of oper ations ignition cycle which lead to the ignition of the gas at the burner It checks the presence of the flame during the entire period in which it is activated and supplies the fan regu lating its speed The Electronic control ignition p c b has a safety func tion and any incorrect interventions or tampering can result in conditions of dangerous functioning of the boiler The Electronic control ignition p c b can lock the func tioning of the boiler lock state and stop its functioning up to the resetting intervention The lock is signalled by the lighting of the lock out signal lamp and the device can be reset only by using the boiler reset button placed on the control panel fascia Some components which are connected to the device can activate the lock state The causes of a lock state could be O The intervention of the safety thermostat over heat of the primary circuit The intervention of the flue temperature probe overheat of the combustion products A fault on gas supply Faulty ignition faulty ignition electrodes their wir ing or connection Faulty flame dete
46. ondition function control in or position 1 second 1 second OFF With the boiler switched ON all the lamps 19 in Fig 9 2 are activated Thefollowing table gives the relationship between each of the possible lamp combinations and their meaning orm CONS uc ues ne E AER pu eU CO ZO Lack of burner ignition Q D Safety thermostat lock out EES es Lack of power supply or faulty electronic control p c b Faulty Electronic control ignition p c b Flashing lamp alone Flashing lamp or simultaneously alternate with with an other lamp another lamp Le e o Faulty primary circuit MS no water or absence of flow Lamp Lamp OFF ON 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 Setting the boiler control function modes Itis possible to select the various boiler control function modes by using the function selector knob A and the D h w temperature control knob B Fig 9 5 On model M110B 24SR the knob B is used just for boiler setting and doesn t affect the boiler functions during the normal operation During the function modes setting the boiler does not operate 19 Electronic control ignition p c b Fig 9 5 Adjustment of maximum useful output in c h mode
47. onds The lamps E will flash a number of times corresponding to the setting Fig 9 15 M110B 24SR 4 flashes M110B 24SM M110B 32SM 1 flash Fig 9 15 7 To change the setting turn the knob B on a posi tion corresponding to the boiler models Fig 9 15 By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indi cating that the setting has changed and must be memorised 8 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 9 Press the reset button C once until the lamps E give the indication as in Fig 9 16 boiler mode Qe Where Lamp OFF 00 000 amon Fig 9 16 It s now possible to check the current setting by pres sing reset button C for more than 5 seconds The three lamps E will flash a number of times corresponding to the setting as in Fig 9 17 once for the combination and four times for system boilers Atthis point only the right green light flashes M110B 24SR 4 flashes M110B 24SM M110B 32SM 1 flash Fig 9 17 Fig 9 13 21 Electronic control ignition p c b 10 the water control to minimum Lock out lamp blinks 2 per second indicating the setting has changed 11 Tochange the setting turn the knob B on a posi tion corresponding to the boiler model Fig 9 17 12
48. oover 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 5 4 The siliconic gasket S Fig 5 4 must be replaced every 2 years 11 6 D h w heat exchanger XN Function The d h w heat exchanger A in Fig 6 1 and Fig 6 3 al lows the instantaneous transfer of heatfrom the primary hydraulic circuit to the water destined for d h w use SS A ate 2 m V Fig 6 1 The schematic structure is shown in Fig 6 2 A V AY mm Primary hydraulic circuit Domestic hot water circuit Fig 6 2 Removal NN 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 Completely unscrew the Allen key screws B Fig 6 3 which hold the exchanger to the brass group 4 Remove the electric actuator following the in structions in section 8 3 12 Fig 6 3 5 Remove the pump following the instructions in section 7 3 Fig 6 4 6 Completely unscrew the Allen key screws C Fig 6 4 which hold the exchanger to the plastic groups 7 Move the exchanger towards the rear of the boiler and extract it Reassemble the d h w heat exchanger carrying
49. out the removal operations in the reverse order Warning to lubricate the O ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities Attention When reassembling the exchanger be sure to put the off centre location securing pin indi cated in Fig 6 5 towards the left side of the boiler Fig 6 5 7 Function The pump A in Fig 7 1 and Fig 7 2 has the function of making the water in the main circuit circulate through the main condensing heat exchanger and therefore through the c h system during the c h function or through the secondary heat exchanger during the d h w function f Y rot Fig 7 1 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 7 2 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
50. re is at least 400 mm clearance above the boiler and the rear exit flue can be easily removed the expan sion vessel can be changed without removing the boiler NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front and left hand side panels of the case turn off the flow and return isolation valves and empty the primary circuit 2 Completely unscrew the connection K the lock nut L Fig 13 2 and remove the expansion vessel from the top of the boiler Fig 13 2 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 13 3 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 Fig 13 3 31 14 D h w flow switch filter and flow limiter EAN Function The d h w flow switch A in Fig 14 1 is a device that generates an electrical signal when hot water is drawn SS 2 NY FY Fig 14 1 When the flow rate through the d h w circuit reaches about 2 5 litres min the float 5 Fig 14 3 is dragged upwards and the magnetic in it getting closer to the sensor 8
51. re probe B Fig 15 3 NA Warning isolate the boiler from the mains 4 Reassemble the d h w Temperature probe carry electricity supply before removing any ing out the removal operations in reverse order covering or component Warning to lubricate the O ring gaskets exclusively use a silicone base grease Remove thio fong pane Ole ease compatible to be in contact with foods and 2 Empty the d h w circuit of the boiler approved by the local water Authorities 35 16 By pass valve 2 Empty the primary circuit of the boiler 3 Remove the diverter group as described in the HAN Function section 8 4 of this manual The By pass valve A in Fig 16 1 is located between 4 Unscrew the connector and remove the by the c h water flow and return and its function is that of pass valve C Fig 16 2 Fig 16 3 guaranteeing a minimum flow across the primary heat exchanger if the circulation across the c h system is completely closed The By pass valve is fitted on the rear side of the div erter group A Je 2d TN LV Fig 16 2 Fig 16 1 Removal NN Warning isolate the boiler from the mains Fig 16 3 electricity supply before removing any 5 Reassemble the by pass valve as illustrated in covering or component Fig 16 2 Fig 16 3 reversing the order of re 1 Remove all the case panels moval 36 17 Fan and Air box Function The function of the Fan A
52. ront panel of the case 2 Loosen the screws B and C Fig 2 3 3 Remove the screws D 4 Move the lower part of the side panels as indi cated in Fig 2 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 2 4 5 Remove the screws E and remove the service panel Fig 2 5 Fig 2 5 6 Remove the screws F and remove the control panel lid Fig 2 5 Access to the sealed chamber Fig 2 6 General access and emptying hydraulic circuits To gain access to the parts contained in the sealed chamber it is necessary to remove the lid of the sealed chamber For this purpose remove the front and side panels of the case remove the screws G as indicated in Fig 2 6 and remove the lid Emptying the primary circuit 1 Close the c h circuit flow and return cocks H Fig 2 7 Fig 2 7 bottom view of the boiler 2 Remove the front and right panels of the boiler 3 Open the drain tap Fig 2 9 combi or Fig 2 10 only c h until the boiler is completely emptied 4 To help the draining of the primary circuit loose the condensing heat exchanger air purger valve J Fig 2 8 Fig 2 8 Attention some water could remain in the condens ing heat exchanger 5 Close drain tap once the emptying has been completed 3 Genera
53. section 17 2 3 Disconnect the detection electrode connector D the ignition electrodes connector E and the earth wire F 4 Disconnect the fan connector G by pressing the plastic hook placed on the side of the connector Fig 5 2 Unscrew the nuts H Fig 5 2 Remove the fan burner group Empty the primary circuit of the boiler Remove the clips J Fig 5 2 Loosen the connection K and slightly move the pipe L upwards turn it towards left Fig 5 2 and then move the pipe downwards freeing it from the Condensing heat exchanger 10 Fig 5 2 10 Loosen the connection M and slightly move the pipe N upwards turn it towards left Fig 5 2 and then move the pipe downwards freeing it from the Condensing heat exchanger Condensing heat exchanger Using pliers remove the spring O moving it downwards and disconnect the rubber pipe P Fig 5 3 Unscrew the screws Q and remove the clamps Fig 5 3 Disconnectthe two connectors by pressing the plastic hook placed on the side of the connector Fig 5 3 Remove the Condensing heat exchanger by levering it and sliding it forwards Reassemble the Condensing heat exchanger carrying out the removal operations in reverse order Ensure to tight the nuts H Fig 5 2 firmly EXIM Cleaning Ifthere are deposits of dirt on the coil of the Condensing heat exchanger clean with a bristle paintbrush and re move the dust with a h
54. t point Fig 11 2 EN Adjustment NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Check the supply pressure before making any ad justment to the gas valve 1 2 9 10 Close the gas inlet valve Remove the front panel of the case and lower the control panel see sections 2 2 and 2 3 Loosen the internal screw on the Inlet Pressure Test Point 5 Fig 11 2 of the Gas valve and con nect a pressure gauge using a suitable hose Open the gas inlet valve Turn on the electricity supply to the boiler switch ing on the fused spur isolation switch The appliance operation light on the left will flash every 4 seconds Set the function knobs as illustrated in Fig 11 4 Open at least one hot water tap fully Read the inlet pressure value and ensure that it is within the limits given in the table Gas supply pressures of the user installation manual If it does not comply with the required pressure check the gas supply line and governor for faults and or correct adjustment Switch offthe boiler close the gas inlet valve and close the water tap Disconnect the pressure gauge and close the Inlet Pressure Test Point 5 Fig 11 2 Gas valve adjustment 11 Fitthe probe of the flue analyser in the flue ex haust sampling point located on the exhaust pipes of the boiler Fig 11 3 air flue exhaust sampling points Fig 11 3 12 Turn on the boil
55. the three way diverter valve Fig 8 7 Reassemble the diverter group carrying out the removal operations in the reverse order Warning to lubricate the O ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities 9 Electronic control ignition p c b ESM Function Fig 9 1 Inlet Information On the Electronic control ignition p c b Function control C h temperature adjustment D h w temperature adjustment Boiler reset button control panel fascia From other boiler devices C h temperature probe NTC D h w temperature probe NTC D h w flow switch Primary circuit flow switch Flue temperature probe NTC Safety thermal fuse Safety thermostat Flame detection electrode Room thermostat if fitted Time switch Outlet command Pump Three way diverter valve Gas valve Fan Ignition electrodes Appliance operation lights Lock out signal lamp control panel fascia The fundamental function ofthe Electronic control igni tion p c b is that of controlling the boiler in relation to the external needs i e heating the dwelling or heating the water for d h w use and operating in order to keep the temperature of the hydraulic circuits constant This is obviously possible within the useful power and maximum working temperature limits foreseen Generally the Electronic contr
56. tor Fig 17 2 10 Unscrew the screws L Fig 17 2 11 Remove the fan M 12 Assemble the Fan and the Air box carrying out the removal operations in reverse sequence Before reassembling ensure the fan gasket Fig 17 3 is correctly mounted 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 18 Ignition and detection electrodes burner and spark generator EAN Function Three electrodes are fitted on the fan burner group Two of them fitted on the right side of the fan burner group A are the ignition electrodes B and are con nected to the spark generator C On the left side is the detection electrode D and it de tects the presence of the flame Fig 18 1 The burner E is fitted on the rear of the fan burner group A 38 Fig 18 2 Removal of the Ignition and detection electrodes 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 see section 2 2 Disconnect the ignition electrodes connector F and the earth wire G from the spark generator C Fig 18 1 and disconnect the detection elec trode connector H 3 Unscrew the screws and remove the ignition
57. ual EEE Removal of the front insulation panel See warning note at the end of this chapter before to remove this part 1 Remove the Ignition and detection electrodes see section 18 2 Remove the burner see section 18 3 Remove the front insulation panel Fig 18 6 Assemble the new front insulation carrying out the removal operation in reverse order When fitting the new panel ensure that the elec trodes holes coincide with the holes of the com bustion chamber front insulation Fig 18 6 The siliconic gasket Fig 18 6 must be replaced if damaged or anyway every 2 years The front insulation Fig 18 6 must be replaced if damaged or wet IEEE Removal of the rear insulation See warning note at the end of this chapter before to remove this part Attention Cover the inner of the condensing heat exchanger to avoid that dirt and debris fall in the coil 1 Do the operations of section 18 3 from step 1 to step 3 2 Unscrew the screw L remove the washer M and the rear insulation N Fig 18 7 39 Ignition and detection electrodes Fig 18 7 The rear insulation Fig 18 7 must be replaced if damaged or wet IX Removal of the spark generator 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 spark generator conne
58. ure the Flue temperature probe NTC electri cal resistance at the ambient temperature and check it according to the graph in Fig 20 4 43 Flue thermostat Q 12500 12000 11500 11000 10500 10000 9500 9000 8500 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 _ att tT 100 EL LL DER so LLL tT 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 C Fig 20 4 44 21 Condensate trap Function The condensate trap A in Fig 21 1 and Fig 21 2 allows the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combustion products A plastic ball closes the trap outlet in case that the trap is empty 2 alte S m V Jt A Fig 21 1 If the drain pipe is plugged or in any case in which the condensate isn t correctly evacuated the condensate level in the trap rises till it reaches the detection elec trode in the combustion chamber thus causing the boiler lock out AEJ Check the cleanness of the trap Unscrew the plug on the bottom of the trap and remove dirt eventually deposit AEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front and left case panels 2 Disconnect the trap from the draining pipe 3 Using pliers remove the spring B moving it up
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