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Electronic control p.c.b.

23

9.11

Thermal control in the ” ” mode

See functioning with the function

control in the

mode

(sec. 9.12)

Taking

water from the domestic hot

water circuit?

Switch in the

function mode

NO

YES

Is primary circuit

temperature higher than that

selected?

NO

Request for heat from

room thermostat?

Starts the circulator

Operates motorised valve

Supplies the ignition device

NO

Circulator off

Operates motorised valve

Ignition device off

YES

YES

Fig. 38

9.12

Thermal control in the ” ” mode

Is domestic

hot water outlet temperature

lower than that

required?

Supplies the ignition device

Ignition device off

Circulator on

YES

NO

Switch in the

function mode

Taking

water from the domestic hot

water circuit?

YES

Circulator off

Ignition device off

NO

Fig. 39

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Summary of Contents for M90E.24S

Page 1: ...G C Appl No M90E 24S 47 970 17 M90E 28S 47 970 18 M90E 32S 47 970 21 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 ...

Page 2: ......

Page 3: ...n the mode 23 10 Full sequence ignition device 24 10 1 Function 24 10 2 Checks 24 10 3 Removal 24 10 4 Ignition and control sequence 25 11 Modulating gas valve 26 11 1 Function 26 11 2 Nomenclature of the parts 26 11 3 Adjustment 26 11 4 Checks 27 11 5 Removal of the on off operator coils 27 11 6 Removal of the gas valve 27 12 Primary circuit flow switch 28 12 1 Function 28 12 2 Checks 28 12 3 Rem...

Page 4: ...tion chamber Automatic air release Pump D h w temp probe D h w heat exchanger Expansion vessel Detection electrode valve D h w flow switch Diverter valve Air pressure switch Main circuit flow switch 1 2 Hydraulic diagram Central heating c h operation Domestic hot water d h w operation C h water flow C h water return D h w inlet D h w outlet ...

Page 5: ... A Fig 2 lift the panel and remove it A Fig 2 To remove the side panels loosen the screws B and C Fig 3 bring the base of the panels away from the boiler and lift them freeing them from the top hooks B D C Fig 3 bottom view of the boiler 2 3 Control panel Warning isolate the boiler from the mains electricity supply before removing any covering or component To gain access to the parts located insid...

Page 6: ...id 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 2 5 Emptying the primary circuit 1 Close the c h circuit flow and return cocks H Fig 7 H H J Fig 7 bottom view of the boiler 2 Remove the front and right panels of the boiler 3 Open the drain tap I Fig 8 until the boiler is com pletely emptied 4 Close ...

Page 7: ...ve D h w flow switch flow switch C h temperature probe NTC Electronic control p c b Full sequence ignition device gn green ye yellow rd bu wh rd bu rd bu bn bu bn bn bu bn bu bk bn bu 3 1 2 bk gnye bu rd bu bn gnye gnye gnye gnye gnye gnye gnye gnye gnye bu bn bn bu rd rd wh bu rd bu rd rd gy bn bu bu bu bn bu gy rd gnye ye wh gnye vt og bn bu bk rd bk wh gn NC COM NO vt violet og orange gnye gree...

Page 8: ...ing Primary circuit DHW temperature probe NTC Three way diverter valve gas valve DHW flow switch flow switch CH temperature probe NTC Electronic control p c b Full sequence ignition device gnye gnye bu gnye gy rd bu wh rd bu rd bu bn bu bn bn bu bn bu bk bn bu 3 1 2 rd bu bn bn gnye gnye gnye gnye gnye gnye gnye gnye gnye bu bn bn bu rd rd wh bu rd bu rd rd gy bn bu bu bu bn bu gy rd gnye ye wh gn...

Page 9: ... L Transformer ACTIVE CIRCUIT INACTIVE CIRCUIT L LINE N NEUTRAL N Electronic control p c b low voltage section J1 2 J3 3 J3 5 J3 4 J3 2 J3 1 J2 4 J2 5 Three way diverter valve Pump Full sequence ignition device Fuse 1 6A T Heat request on d h w PTC J1 1 L Transformer N Electronic control p c b low voltage section J1 2 J3 3 J3 5 J3 4 J3 2 J3 1 J2 4 J2 5 Three way diverter valve Pump Full sequence i...

Page 10: ...c h operation only during d h w operation 230 230 230 0 Pump Full sequence Ignition device 3 way diverter valve 0 0 Electronic control p c b 230 230 Modulating Gas valve Safety thermostat 0 Fan 230 230 0 Electronic control p c b Air pressure switch Diagrams for boiler equiped with full sequence ignition device type Bertelli Partners FM30 ...

Page 11: ...eration only during d h w operation 230 230 230 0 Pump Full sequence Ignition device 3 way diverter valve 0 0 Electronic control p c b 230 230 Modulating Gas valve Safety thermostat 0 Fan 230 230 0 Electronic control p c b Air pressure switch Diagrams for boiler equiped with full sequence ignition device type Honeywell FPLD ...

Page 12: ...Diagrams 10 ...

Page 13: ...OFF OFF The boiler does not start either in c h or d h w mode Fan still J J J By pressing the reset push button the boiler turns on and operates correctly J J 7 J J J ulses By pressing the reset push button the boiler starts the ignition cycle The burner doesn t light on the igni tion sparks continue and the boiler locks again J J J J ON fast pul ON By pressing the reset push button the boiler sta...

Page 14: ... c h J J J J Water leaks from the safety valve when the boiler is off J J J Note 1 For details see section 9 4 of this manual Further useful information can be obtained by switching the electronic control p c b in the service operation mode see section 9 4 of this manual 2 Check for 230V between line L and neutral N Verify the integrity of supply cable plug and external fuses Check the polarity of...

Page 15: ...E F G Fig 11 5 Unscrew the connection H Fig 12 lift the pipe I 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 Reassembl...

Page 16: ...t 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 B Fig 15 5 Move the exchanger towards the rear of the boiler and extract it Reassemble the d h w heat exchang...

Page 17: ...here is a defect in starting the rotor will begin to turn normally only starting it manually n 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 roto...

Page 18: ...r 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 B bn brown bu blue bk black 0 V 230 V Spindle B not visible Open circuit 9 4 Kohm bk bn bu 3 1 2 Fig 21 D h w mode B bn brown bu blue bk black 230 V 0 V Spindle B visible Op...

Page 19: ...tch G 5 Disconnect the c h temperature probe H 6 Unscrew the connector I the c h flow connector and the d h w outlet connector F G I H Fig 24 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 9 Unscrew the screw L and remove the diverter group J K L Fig 25 Rear view of the boiler 10 Refer to the exploded view in Fig 26 to remove the internal part...

Page 20: ...ts 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 9 2 Selection and adjustment devices On the Electronic control p c b several selection ad justment and protection devices are located Fig 28 So...

Page 21: ... temperature probe iscompared with the signal given by the control panel through the adjustment made by the user knob 75 C Fig 30 Normally the result of the comparison between these two signals directly operates the adjustment elements of the 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 operati...

Page 22: ...ons and their meaning Normally operating boiler C h operation D h w operation Frost protect operation D h w operation Excessive temperature on primary circuit Faulty c h temperature probe NTC Faulty d h w temperature probe NTC Faulty primary circuit no water or absence of flow Lack of burner ignition no ignition signal from the full seqence ignition device Ignition gas pressure adjustment Minimum ...

Page 23: ...F position Fig 33 and use the adjustment device 11 ACC Adjust the gas pressure at the injectors tothe valueindi 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 operation...

Page 24: ...hem in the knob 9 While tightening the screws that fix the Electronic control p c b on the control panel keep the p c b towards the control panel fascia making sure of the contact between the boiler reset but ton B and the tab C Fig 37 A B C Fig 37 Attention After installing the Electronic control p c b 10 Make sure the c h and d h w tempera ture adjustment knobs can move freely for the complete r...

Page 25: ...for heat from room thermostat Starts the circulator Operates motorised valve Supplies the ignition device NO Circulator off Operates motorised valve Ignition device off YES YES Fig 38 9 12 Thermal control in the mode Is domestic hot water outlet temperature lower than that required Supplies the ignition device Ignition device off Circulator on YES NO Switch in the function mode Taking water from t...

Page 26: ...or connection f Gas injectors blocked f Faulty modulation gas valve faulty on off oper ators or not electrically supplied f 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 41 shows the sequence of the operations that are carried out at the s...

Page 27: ...ssure switch at work NO YES starts ignition discharges opens gas valve beginning of ignition period flame presence end of ignition period NO NO YES closes gas valve stops fan interrupts ignition discharges memorizes lock turns on lock out light YES reset push button pressed NO YES cancels lock interrupts ignition discharges gas valve open flame presence Air pressure switch at work NO YES YES close...

Page 28: ...lve 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 43 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...

Page 29: ...ront panel of the case as explained in the section 2 3 of this manual 2 Disconnect the connector D Fig 45 3 Unscrew the screw E and remove on off oper ator coils 4 Reassemble the coils carrying out the removal operations in reverse order E D Fig 45 11 6 Removal of the gas valve Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front...

Page 30: ...the switch box verify the position of the shaft B referring to Fig 49 B Boiler OFF Boiler ON Fig 49 n 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 12 3 2 Measure the electrical resistance between the tabs marked C and N O Fig 50 The contact...

Page 31: ... 13 3 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 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 isolatio...

Page 32: ...essory 10 Threaded ring 1 2 3 4 5 6 7 8 9 10 Fig 57 14 3 Checks Warning isolate the boiler from the mains electricity supply before removing any covering or component n Flow switch sensor operation 1 Remove the front panel of the case 2 Switch on the boiler and open a d h w tap The lamp B Fig 56 placed on the sensor body is switched on when the flow rate reaches about 2 5 litres min 14 4 Removal o...

Page 33: ...tch sensor 1 and bring the ring in touch with the sensor as illustrated in Fig 59 4 Observe the lamp B placed on the sensor body that should light If not reverse the ring and repeat the previous operation 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 rev...

Page 34: ... return d h w inlet d h w outlet B Fig 61 15 2 Checks n Temperature resistance relationship Warning isolate the boiler from the mains electricity supply before removing any covering or component Disconnect the cable from the Temperature probe Measure the temperature of the brass group where the Temperature probe is located and check the electrical resistance according to the graph in Fig 60 15 3 R...

Page 35: ...ve is fitted on the rear side of the div erter group A Fig 64 16 2 Removal Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels 2 Empty the primary circuit of the boiler 3 Remove the diverter group as described in the section 8 4 of this manual 4 Unscrew the connector B and remove the by pass valve C Fig 65 C B Fig 65 5...

Page 36: ... from the mains electricity supply before removing any covering or component 1 Remove all the case panels and the sealed chamber lid 2 Disconnect the wires and check the electrical re sistance between the connections of the Air pres sure switch Refer to the Fig 67a or b in accordance with the type of air pressure switch used Between COM or 3 and N O or 2 the contact must be open Between COM or 3 a...

Page 37: ...the venturi device Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the fan section 17 3 2 Remove the venturi device by unscrewing the screw 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 ...

Page 38: ...Ignition 4 mm Fig 75 3 Check the integrity of the detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner n Check the connection wires 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 ...

Page 39: ...rder Refer to Fig 73 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 chapter Maintenance of the installation instructions manual ...

Page 40: ...ument panel The boiler should maintain a temperature below that of the safety thermostat and no overheat intervention should occur n Electrical function 1 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 W 19 3 Removal Warning isolate the b...

Page 41: ...Safety thermostat 39 ...

Page 42: ...178 Combustion chamber side panels 2 BI1326 100 10 E83 180 Combustion chamber rear panel mod M90E 24S 1 BI1326 107 E83 181 Combustion chamber rear panel mod M90E 28S M90E 32S 1 BI1326 108 11 E83 196 Combustion chamber front panel mod M90E 24S 1 BI1326 101 E83 197 Combustion chamber front panel mod M90E 28S M90E 32S 1 BI1366 109 12 Electronic regulation p c b 1 BI1515 107 13 E83 142 Full sequence i...

Page 43: ...Short spare parts list 41 1 2 6 4 5 7 3 8 15 18 12 13 20 21 22 23 25 26 14 16 24 17 19 9 10 11 9 ...

Page 44: ... 1796209165 17962 0916 5 1704 44A4 UK ...

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