SERVICE MANUAL RIVA COMPACT M90E.24S M90E.28S
Contents
1. Fig 1 Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Mm Check that the pump is not seized and that the movement of the rotor is not subject to mechanical im pediments With the boiler off remove the front panel Remove the air release plug of the pump and turn the rotor with a screwdriver Mm Check the electrical continuity With the boiler off remove the front panel and discon nect the connector B Fig 2 Measure the electrical resistance between the pump supply connections Electrical resistance of the windings at ambient tem perature must be about 230 Q r 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 ofthe arrow Ifthere is a defect in starting the rotor will begin to turn normally only starting it manually Mm Check that the impeller is integral with the rotor With the boiler off remove the front and right hand side case panels lower the control panel and empty the pri mary circuit Remove the pump head by undoing the screws which hold it to the pump body and check that the impeller is firmly joined to the rotor Removal NN Warning2. Fig 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 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 2 EEE 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 shaft B referring to Fig 3 _ Boiler OFF B Fig 3 Boiler ON Y Electrical check Itis possible to verifythe 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 11 3 2 Measure the electrical resistance between the tabs marked C and N O Fig 4 The contact must be normally open 3 Operate the switch by hand
3. Fig 1 KEEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels Empty the primary circuit of the boiler 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 2 Fig 2 5 Reassemble the by pass valve as illustrated in Fig 2 reversing the order of removal 30 16 Fan venturi device and Air pressure switch HAH 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 6 and an Air pressure switch KEY Checks r 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 1 and measure the electrical resistance of the motor that has to be about 47 Q M90E 24S 43 Q M90E 28S 25 Q M90E 32S at ambient temperature Fig 1 Mm Check of the Air pressure switch operation NN Warning isolate the boiler from the mains electricity supp
4. Y Y 3 Check the integrity ofthe detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner 4 Check the connection wires NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Check for the integrity of the insulation of wires which connect the electrodes to the ignition de vice Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove all the case panels the sealed chamber lid and the combustion chamber lid 2 Disconnect the electrode wires from the full se quence ignition device 3 Remove the burner by unscrewing the four screws placed at the right and left sides of the burner 3b For model M90E 28S and M90E 32S remove also the plate C see Fig 2 on page 35 4 Unscrew the screws A Fig 4 which hold the electrodes to the burner Two screws are used on the models M90E 24S M90E 28S Three screws one for each electrode are used on the model M90E 32S 33 Ignition and detection electrodes 34 5 Extract the electrodes from the burner 6 Assemble the electrodes carrying outthe removal operation in reverse order Refer to Fig 1 in order to recognise the elec trodes and to correctly connect the wiring Note the metallic edg
5. Fig 1 The schematic structure is shown in Fig 2 AY A V mam Primary hydraulic circuit Domestic hot water circuit Fig 2 10 EEN 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 Remove the motor ofthe three way diverter valve see section 8 3 4 Completely unscrew the two Allen key screws B Fig 3 which hold the exchanger to the brass groups Fig 3 5 Move the exchanger towards the rear ofthe boiler and extract it Reassemble the d h w heat exchanger carrying outthe 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 4 towards the left side of the boiler Fig 4 7 Pump Function The pump A in Fig 1 has the function of making the water inthe 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 s J
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7. Wall hung fan flue room sealed gas boiler SERVICE MANUAL RIVA COMPACT Models 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 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 A Table of contents mb N 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 5 Wiring diagram 5 Circuit voltages 6 Fault finding 7 Primary heat exchanger 9 Characteristics _ 9 Removal tarigi usya cece eee eee ees 9 Cleaning 9 D h w heat exchanger 10 FUNGUO o ateo ada ee 10 ROMOVAl a Sa re Se A 10 PUMP a ic na aan 11 Function aros a 11 Checks nme anne 11 Removal yz uya yasa aun S Sus aqa 11 Three way diverter valve 12 Function
8. 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 _ r 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 KEEN 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 1b For model M90E 28S and M90E 32S remove the screw B and the plate C Fig 2 as ep mo 2 Disconnect the wiring D Fig 3 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 35 Safety thermostat 36 19 Shortspare parts list Key G C part no 173 149 169 069 169 070 3 E
9. arena 12 Checks una masasun 12 Removal of the electric actuator 12 Removal of the diverter group and its internal parts 13 Electronic starting control p c b 14 Function 44 20 e eee nes 14 Selection and adjustment devices 14 Checking the temperature 15 Operation lamps 15 Setting the boiler control function modes 16 Reignition frequency setting 16 Ignition gas pressure adjustment 16 Adjustment of useful c h output 17 Gas conversion 18 A irei tera apa 19 Removal of the electronic control p c b 19 Thermal control in the E mode 21 Thermal control in the Ye mode 22 12 1 12 2 12 3 12 4 13 13 1 13 2 13 3 13 4 13 5 13 6 14 14 1 14 2 14 3 15 15 1 15 2 16 16 1 16 2 16 3 16 4 16 5 17 17 1 17 2 17 3 18 18 1 18 3 19 Modulating gas valve 23 Function a a 23 Nomenclature of the parts 23 Adjustment 23 CHECKS diia iaa ad aaa 24 Removal of the on off operators coils 24 Removal of the gas valve 24 Primary circuit flow switch 25 FUNCTION 4 ei Geeta men 25 CHECKS ana cios a tabs a ad asa 25 Removal L SA cee eee eee ees 25 Expansion vessel and temperature pressure gauge 26 Function arte pl hae vee 26 CHECKS i r daar tee Da saus 26 Removal
10. 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 29 20 Attention After installing the Electronic starting control p c b 10 11 Make sure the c h a 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 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 Electronic starting control p c b EXP Thermal control in the mode NO See functioning with the function control in the x mode lt YES Taking water from the domestic hot water circuit Is primary circuit temperature higher than that selected sec 9 13 Circulator off i Starts the circulator Operates motorised valve Request for heat from YES Operates motorised valve room thermostat Ignition device off Supplies the ignition device YES lock memorised L P starts fan k Air pressure switch at rest Air pressur
11. IEA ES EAG BOT 409 BTO 402 Overheat thermostat BI1172 105 Fuse 1 6 AT BI1005 105 A a Temperature probe mamordnm eram T BHOOT TT7 i electrode TE 345 mE 288 1 BI1123101 onion electrode let mod MSOE 32S 1 BT195 102 BrT123 106 Ignition electrode right mod M90E 32S BI1193 103 BITTE 102 BITT93 104 BHT475 108 Manufacturer s reference Polidoro Polidoro CIMM 6 litres FIME GR02040 39W FIME GR02045 47W FIME GR02050 60W SIT 845 Sigma Yamatake Honeywell C6065 SIT 380 alternative Watts Orkly alternative WSC NFSL 12 5 Elbi ELTH type 261 IMIT 37 N S amp S SD j A D Sy N P Q e el 0 z o bce eAe S El N o F 9 LY LO Sy o 02 o 17 A e EN A DAA XD amp x 0 9 ai ZN lt a Q o BA N 7 Si e NSN YS S A U ORY y v lt A Y Lo q lt N N 7 A A A JA A A A O as A A A A 2 A A x g Sh 17962 0916 7 1908 44A4 UK Bg 85 Y
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13. a com parison operates the modulation of the gas valve consequently changing the useful output of the boiler 2 lt A 7 When the boiler functions in d h w Fig 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 4 lt Y X gt 75 C bee Oe re vv vv i bes IIJIA II IA L s s a Fig 4 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 X func tion are illustrated in detail in sections 9 13 and 9 12 EX Operation lamps The Electronic starting control p c b is provided with three lamps L E D indicators 15 in Fig 2 that give op tical information during the normal operation of the boiler or for service purpose O Normal operation Only the green lamp on the left is directly visible on the con
14. an electrical signal when hot water is drawn MEW A GO J Fig 1 When the flow rate through the d h w circuit reaches about 2 5 litres min the float 6 Fig 3 is drawn to wards the right The resulting magnetic field of ring 5 increases and re aches the flow switch sensor 1 The sensor generates an electrical signal that switches the boiler d h w operation ON The state ofthe sensor is also indicated by means ofthe lamp B placed on the sensor body Fig 2 KEEN Nomenclature and location of parts Fig 3 Flow switch sensor Body O ring Spring Magnetic ring Float Threaded ring Flow limiter optional accessory Filter 0 Spring seat 200 O Q Q N Fig 3 KEEN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Mm 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 2 placed on the sensor body is switched on when the flow rate reaches about 2 5 litres min EEE Removal of the fl
15. 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 allthe wiring connected to the Electronic starting control p c b To disconnect the connectors J1 J3 J7 J15 J16 and 5 1 9 15 and 6 in Fig 2 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 28 4 Unscrew the four screws that hold the Electronic starting control p c b on to the control panel 5 Remove it by lifting its rear edge and freeing it from any of the wiring 6 Re assemble the Electronic starting control p c b following the removal procedures in the re verse order Important When re assembling the Electronic starting 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 29 reaches the potentio 19 Electronic starting control p c b meter edge It is not necessary to force them in the knob While tightening the screws that fix the Electronic starting control p c b on the control panel keep
16. 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 2 Unscrew the connection C and movethe pipe up wards freeing it from the outlet port ofthe pump Remove the fork D and the capillary pipe 7 Remove the locking plate E right Fig 2 OI OQ 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 3 and remove the pump towards the front of the boiler Fig 3 Reassemble the pump carrying out the removal oper ations in the reverse order When reassembling the pump check the correct location ofthe O ring gasket in the inlet port of the pump that seals the connection between the pump and the brass group 11 8 Three way diverter valve EXI Function The diverter valve A Fig 1 has the function of modify ing the hydraulic circuit of the boiler by means of an electric command given by the electronic control p c b in order to send the water that exits the primary heat ex changer towards the c h system or towards the d h w heat exchanger I N Fig 1 EX Checks Mm Check the electrical continuity Fig 2 indicates the relationship bet
17. the screws C Fig 3 3b For model M90E 28S and M90E 32S only re move the screw D and the plate E 4 Remove the clips F and the safety thermostat G Itis not necessary to disconnect it from the wiring 5 Unscrew the connection H Fig 4 lift the pipe and rotate it right then move it downwards freeing 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 3 Fig 4 EEN Cleaning If there are deposits of soot or dirt between the blades of the heat exchanger clean with a brush or non me tallic bristle brush In any case avoid any actions that can damage the pro tective varnish with which the exchanger has been cov ered Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual 9 6 D h w heat exchanger EX Function The d h w heat exchanger A in Fig 1 allows the instan taneous transfer of heat from the primary hydraulic cir cuit to the water destined for d h w use s r
18. valve Full sequence ignition device Modulation operator Appliance operation light Operation service lamps Lock out signal lamp control panel fascia The fundamental function of the Electronic starting con trol 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 starting control 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 1 EYE Selection and adjustment devices On the Electronic starting control p c b several selec tion adjustment and protection devices are located Fig 2 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 1 15 2 14 13 12 3 11 5 10 6 9 8 4 7 Fig 2 1 Connector J1 electric supply terminal block 2 Fuse Fi 3 15A 250V 3 Connector J3 Pomp three way diverter valve 4 Connector J16 On off operators gas valve 5 Connector J19 Flame detection electrode 6 C
19. 10 sec onds until the lock out signal lamp D blinks 16 afte HUNDEN M MM Lo1 102 LD3 O a ora W E Fig 7 3 The lamps E should give the indication as in Fig 7 Fig 8 reignition frequency If not press the reset button repeatedly to obtain it O O Where Lamp OFF Lamp ON Fig 8 At this step it is possible to visualize the current setting by keeping the reset button C pressed for more than 5 seconds The lamps E will flash a number of times corresponding to the setting Fig 9 4 To change the setting turn the knob B on a posi tion corresponding to the desidered delay By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indicating that the setting has changed and must be memo rised Delay minutes Setting No Fig 9 5 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 6 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A In any case the boiler automatically resets to its nor mal operation after 10 minutes Factory setting 3minutes Ignition gas pressure adjustment 1 Turn the boiler OFF 2 Remove the front panel of the case 3 Open the gas valve outlet pressure test point 8 see section 10 2 and connect the gauge 4 Turn the boiler ON positioning the function selec tor knob A as ind
20. 83 121 5 6 E83 129 7 169 127 8 E83 013 E83 178 E83 180 E83 181 E83 196 E83 197 E01 204 E01 205 14 15 E00 684 16 E83 082 17 E00 688 18 E83 086 1 gt E83 101 169 083 164 026 E83 127 23 E83 126 24 E83 122 25 E83 145 Description Q ty Manufac turer part no KI1004 102 KI1004 147 B11193100 Injectors for natural gas mod M90E 24S 12 KI1064 505 Injectors for natural gas mod M90E 28S 14 Injectors for natural gas M90E 32S 16 BI1193 500 Injectors for LPG mod M90E 24S KI1064 506 Injectors for LPG mod M90E 28S 14 5172108 BI1202 101 Main heat exchanger mod M90E 28S BI1202 102 BI1222 100 Fan mod M90E 24S 1 Bl1366 102 BI1366 103 Fen mod MUERES IT aran Gas valve ss vane t Bi 193 105 Sen ROBOT pressure switch 0 88 0 74 mbar NN EE 103 mod M90E 24S Air pressure switch 1 04 0 92 mbar BI1366 107 mod M90E 28S Air pressure switch 1 38 1 25 mbar BI1376 104 mod M90E 32S Safety valve BI1131 100 Combustion chamber side panels BI1326 100 Combustion chamber rear panel BI1326 107 mod M90E 245 Combustion chamber rear panel BI1326 108 mod M90E 28S M90E 32S Bl1326 101 sss mod M90E 24S mod M90E 28S M90E 32S Electronic Electronic regulation p c b p c b AE a B11885 101 D h w heat exchanger mod M90E 24S BI1001 101 D h w heat exchanger mod M90E 28S BI1001 102 D h w heat exchanger mod M90E 32S BI1161 100
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22. and verify that the contact is now closed C No lt x do not use Fig 4 HEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Removal of the switch 1 Remove the front and right hand side panels of the case 2 Remove the fork C Fig 2 3 Open the box and disconnect the switch 4 Re assemble the parts in reverse order of re moval Refer to Fig 4 for the correct wiring con nectors on the switch vr 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 2 3 Unscrew the four screws E see Fig 5 open the hydraulic operator and remove the membrane F 25 Primary circuit flow switch Fig 5 4 Reassemble the parts in reverse order ofremoval 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 5 12 Expansion vessel and temperature pressure gauge EAH Function The Expansion vessel in Fig 1 function is to allow for the volume expansion ofthe c h circuit water due to the temperature rise EEE 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 6 from the valve
23. e 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 5 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 7 Remove the d h w heat exchanger see section 6 2 8 Remove the fork J and move away the pipe K Fig 6 9 Unscrew the screw L and remove the diverter group Fig 6 Rear view of the boiler 10 Refer to the exploded view in Fig 7 to remove the internal parts of the three way diverter valve Fig 7 11 Reassemble the diverter group carrying out the removal operations in the reverse order 13 9 Electronic starting control p c b EXI Function Fig 1 14 Inlet Information On the Electronic starting 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 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 Outlet command Pump Three way diverter
24. e 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 18 Safety thermostat EAN Function The safety thermostat A in Fig 1 is a device that senses the temperature ofthe primary circuit water which flows in the outlet pipe of the primary heat exchanger If the temperature control system of the boiler fails and the temperature of the primary circuit reaches a dan gerous temperature the safety thermostat opens the electric circuit that supplies the on off operators of the gas valve Consequently the full sequence ignition device at tempts to light the burner and at the end locks the boiler and lights the lock out signal lamp asas j le Fig 1 EEJ Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component r Overheat temperature value Set the temperature control knobs to their max position and run the boiler in d h w
25. e switch at work NO YES T beginning of wait period presence of flame L NO Air pressure switch at work YES starts ignition discharges opens gas valve beginning of ignition period NO YES flame presence closes gas valve stops fan interrupts ignition discharges memorizes lock turns on lock out light L No end of ignition period interrupts ignition discharges gas valve open NO reset push button YES pressed YES flame presence NO gt Safety thermostat NO opens the circuit YES Air pressure switch at work NO Fig 30 21 Electronic starting control p c b CREN Thermal control in the 3 mode Switch in the 3 function mode Circulator on Is domestic hot water outlet temperature lower than that required YES NO YES lock memorised Circulator off NO gt Ignition device off Ignition device off NO NO Air pressure switch at rest cancels lock NO Air pressure switch at NO Air pressure switch at work NO flame presence YES work es beginning of wait period presence of flame YES YES starts ignition discharges beginning of ignition period opens gas valve YES closes gas valve stops fan interrupts ignition discharges memo
26. emove 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 outthe removal operations in reverse sequence Warning to correctly connect the Air pressure switch refer to Fig 5 and Fig 2a or Fig 2b 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 17 Ignition and detection electrodes Function Three electrodes are fitted near the front part of the burner The ignition sparks take place between the me tallic edges of the ignition electrodes 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 Fig 1 shows the electrodes configuration on the mo dels M90E 24S M90E 28S Fig 2 shows the electrodes configuration on the model M90E 32S i Detection Ignition Male Fig 2 Checks r 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 allthe 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 3 4 mm m Ignition lt
27. esistance zero device to the Air pressure switch 31 Fan 4 Fig 4 5 6 Unscrew the screws D and remove the clamp E Fig 4 Remove the three screws F Fig 1 securing the Fan to the flue hood and remove the fan 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 5 Fig 5 Warning After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual LEX Inspection and removal of the venturi device NN Warning isolate the boiler from the mains 32 electricity supply before removing any covering or component Remove the fan section 16 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 Fig 6 UN 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 wires from the Air pressure switch 3 R
28. he case Loosen the screws Band C Fig 3 Remove the screws D O N 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 PJ Emptying the primary circuit 1 Close the c h circuit flow and return cocks H Fig 7 Fig 7 bottom view of the boiler 2 Remove the front and right panels of the boiler 3 Open the drain tap Fig 8 until the boiler is com pletely emptied 4 Close drain tap again once the emptying has been completed Fig 8 PON Emptying the d h w circuit 5 Close the d c w inlet cock J Fig 7 6 Open one or more hot water taps until the boiler has been completely emptied 3 Diagrams EXI Wiring diagram Wiring diagram for boiler equiped wi
29. icated in Fig 10 and ensure that Electronic starting control p c b the timer selector switch and room thermostat if fitted are set to heat demand Run the boiler in c h mode do not open any d h w tap Fig 10 5 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks aT ll LD1 LD2 LD3 S E Fig 11 6 The lamps E should give the indication as in Fig 11 Fig 12 If not press the reset button re peatedly to obtain it O O were Lamp OFF e Lamp ON Fig 12 7 Keep pressed the reset button C for about 5 sec onds until the lock out signal lamp D is switched OFF The boiler runs in c h mode and the lamps E give the indication as in Fig 13 vty OO 0 Where Lamp OFF IN gt gt Flashing lamp alone 0 or simultaneously with an other lamp Fig 13 8 Rotate the knob B on a position corresponding to an adequate ignition pressure Refer to the value indicated in the tables of the User Installation manual Technical information section Gas pressures at the burner table By rotating clockwise the pressure increases 9 Make a note of the position of the knob B 10 Turn the boiler OFF and ON positioning the func tion selector knob A as indicated in Fig 14 11 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 12 Press the reset but
30. ly 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 ofthe Air pres sure switch Refer to the Fig 2 Between COM or 3 and N O or 2 the contact must be open Between COM or 3 and N C or 1 the contact must be 3 Connectthe black wire COM or 3 andthe 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 H connection Fig 2 r 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 3 2 Switch on the boiler Fig 3 3 Compare the value on the gauge with the follow ing minimum values 90 Pa 0 9 mbar M90E 24S 100 Pa 1 0 mbar M90E 28S 130 Pa 1 3 mbar M90E 32S EEN Removal of the Fan Nx 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 1 3 Disconnect the pipe which connect the venturi closed electrical r
31. nt setting by keeping the reset button C pressed for more than 5 seconds The lamps E will flash a number of times corresponding to the setting Fig 26 Fig 27 Gas type p n L PG Setting No 4 Fig 26 7 To change the setting turn the knob B on a posi tion corresponding to the desidered delay By turning the knob B the lock out signal lamp D blinks quickly 2 per seconds indicating that the setting has changed and must be memo rised Gas supply Position of knob B Approx Max current through the modu lator device 125 mA L PG 165 mA Natural gas 8 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 9 To reset the boiler to the normal operation turn it ON by the function selector knob A In any case the boiler automatically resets to its normal oper ation after 10 minutes Factory setting Natural gas EXT Checks Mm Check that the fuse is complete Ifthe Electronic starting control p c b does not supply any device pump fan etc check that the fuse 2 Fig 2 is complete If the fuse has blown replace it with one that has the same characteristics after having identified the reason for failure Mm Check the setting jumpers position Two setting jumpers must be fitted on the Electronic starting control p c b as shown in NO TAG EXE Removal of the electronic control p c b NN Warning
32. ockwise and then on the position correspon ding to the position obtained on step 8 By turning the knob B the lock out signal lamp D blinks quickly 2 per second indicating that the setting has changed and must be memorised 14 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 15 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A checking the ignition pressure and that the burner lights up uniformly In any case the boiler automatically resets to its normal operation after 10 minutes EX Gas conversion Refere to User Installation manual Gas conversion section Procedures 1 Turn the boiler OFF positioning the function selec tor knob A as indicated in Fig 22 Fig 22 2 Remove the front panel of the case 3 Disconnect the C h temperature probe NTC Fig 23 EJ x Fig 23 4 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks Electronic starting control p c b 5 Connect the C h temperature probe NTC Fig 23 EJ E D1 LD2 LD3 S DD Fig 24 6 Press the reset button C repeatedly 4 times until the lamps E give the indication as in Fig 24 Fig 25 gas type mode Where O Lamp OFF e Lamp ON Fig 25 At this step it is possible to visualize the curre
33. of the expansion vessel 26 Removal of the temperature pressure GAUGES conan sun ee eel tee daly 26 D h w flow switch filter and flow limiter 27 Function es ea 27 Nomenclature and location of parts 27 CHECKS airada 27 Removal of the flow switch sensor 27 Removal of the flow switch group and d h w circuit filter 28 Flow limiter 28 Temperature probe 29 FUNCION 29 CHECKS ita dt 29 Removal syz zn ppum wauu Ns 29 By pass valve 30 FUNCION na 30 Removal sisaan i ccc e eee eee ees 30 Fan venturi device and Air pressure SWITCH an Nee felis 31 FUNCION a een 31 GHECKS yaaa ay y sitas 31 Removal of the Fan 31 Inspection and removal of the venturi E u pe Wank aie ee aa eA 32 Removal of the Air pressure switch 32 Ignition and detection electrodes 33 FUNCION iia ae ont ie iia 33 Checks A O 33 Removal 33 Safety thermostat 35 FUNCION ios 35 CHECKS a een 35 Removal 00 0 ccc a eee eee ees 35 Short spare parts list 37 1 Overall information EE Overall View Air pressure switch Main heat exchanger Safety thermostat Burner Ignition z electrodes LLT TOLLI Detection electrode Combustion chamber Automatic air release ra valve Main circuit flow switch D h w temp probe Gas valve Pump Con
34. on the top of the expansion vessel and con nect a suitable air pressure gauge Fig 6 3 Check the pre load pressure and refer to the section Expansion vessel in the User manual and installation instructions for the correct value PEN 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 26 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 7 and remove the expansion vessel from the top of the boiler 3 Re assemble the parts in reverse order of re moval IEZ 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 8 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 8 13 D h w flow switch filter and flow limiter KEX Function The d h w flow switch A in Fig 1 is a device that gener ates
35. onent 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 1 EEN Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Refer to Fig 3 for the c h Temperature probe and to Fig 4 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 4 15 By pass valve HAH Function The By pass valve A in Fig 1 is located between the c h water flow and return and its function is that of guar anteeing a minimum flow across the primary heat ex changer if the circulation across the c h system is com pletely closed The By pass valve is fitted on the rear side of the div erter group ie _ A 69 J A
36. onnector J15 Fan Air pressure switch Safety thermostat 7 Connector J20 e J21 Ignition electrodes 8 Connector J4 Time switch 9 Lock out signal lamp 10 Boiler reset button 11 Function control C h temperature adjustment Electronic starting control p c b 12 Connector J7 c h temperature probe NTC primary circuit flow switch modulating gas valve 13 Connector J6 d h w temperature probe NTC d h w flow switch 14 D h w temperature adjustment 15 Operation lamps ERBE Checking the temperature The Electronic starting control p c b makes it possible to separately adjust the c h water flow temperature and d h w outlet temperature The temperature of the water is converted into an elec tric signal by means of temperature probes The user setting the desired temperature with the con trol panel knobs operates the variable elements 11 and 14 in Fig 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 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 knobkg The result of such
37. oper ator coils 4 Reassemble the coils carrying out the removal ee in reverse order 24 HAJ 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 ofthe case as explained in the section 2 3 of this manual 2 Disconnect the connectors B and C Fig 5 3 Turn off the gas supply and disconnect the gas isolation cock connector from the inlet port ofthe 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 5 11 Primary circuit flow switch URN Function The Primary circuit flow switch A in Fig 1 function is to detect water flowrate through the primary hydraulic circuit of the boiler I 8 A 69
38. ors Maximum gas pressure adjustment On off operators electric connector Gas valve inlet pressure test point Modulation operator oO N O O WwW N Gas valve outlet pressure test point Fig 2 KEN Adjustment NN Warning isolate the boiler from the mains electricity supply before covering or component removing any 1 Remove the front panel ofthe case 2 Open the gas valve inlet pressure test point 6 in Fig 2 atthe valve input connect a suitable pres sure 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 2 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 2 until you obtain the required pressure by rotating clockwise the pressure increases 8 Disconnect one of the two connectors 1 in Fig 2 or alternatively remove the service panel as ex plained in the section 2 3 of this manual and set the dip switch selector 1 see section NO TAG to the OFF position 9 Rotate the minimum gas pressure adjustment 2 in Fig 2 until you obtain the required pressure by rotating clockwise the pressure increases 10 Tu
39. ow switch sensor Nx 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 2 and remove the sensor by delicately livering downwards with a screwdriver 27 D h w flow switch filter and flow limiter KEN Removal of the flow switch group and flow limiter d h w circuit filter If on the M90E 28S and M90E 32S model the flow rate ofthe d h w circuit is too high it is possible to limit it by installing a flow limiter The following sizes are available NN Warning isolate the boiler from the mains electricity supply before removing any covering or component Nominal flow rate litres min 1 Remove the front panel ofthe case and empty the d h w circuit OR l 12 Brown 2 Remove the flow switch sensor see section 13 4 14 Pink 3 Unscrew the body 2 Fig 3 and extract the flow switch group 4 To remove the filter from the flow switch group To install the threaded ring with the flow limiter 1 Remove the flow switch group as explained in the separate the filter 9 from the threaded ring Fig 3 section 13 7 q by levering it 2 Remove the filter from the flow switch group 5 Reassemble the parts following the removing se 3 Unscrew the threaded ring 7 Fig 3 and remove quence in reverse order it from the body 2 4 Reassemble the group following the above se EN Flow limiter quence in reve
40. ressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks LD1 LD2 LD3 Fig 17 6 The lamps E should give the indication as in Fig 17 Fig 18 If not press the reset button re peatedly to obtain it O O Where O Lamp OFF e Lamp ON Fig 18 7 Keep pressed the reset button C for about 5 sec onds until the lock out signal lamp D is switched OFF The boiler runs in c h mode and the lamps E give the indication as in Fig 19 uly O O X where O IN Lamp OFF gt gt Flashing lamp alone 36 or simultaneously with an other lamp Fig 19 8 Rotate the knob B to obtain the pressure to the burner to meet with the central heating system re quirements Refer to diagrams indicated in the tables of the User Installation manual Commissioning sec tion Adiustment of useful c h output By rotating clockwise the pressure increases 9 Make a note of the position of the knob B 10 Turn the boiler OFF and ON positioning the func tion selector knob A as indicated in Fig 20 Fig 20 11 Keep pressed the reset button C for about 10 sec onds until the lock out signal lamp D blinks 18 12 Press the reset button C repeatedly 2 times until the lamps E give the indication as in Fig 21 use ful c h output adjustment mode were Lamp OFF Lamp ON Fig 21 13 Turn the knob B to the minimum fully counter cl
41. rizes lock turns on lock out light end of ignition period NO Fig 22 NO reset push button pressed interrupts ignition discharges gas valve open YES YES flame presence closes gas valve NO NO YES Air pressure switch at NO Safety thermostat opens the circuit work 31 10 Modulating gas valve HAH Function The Modulating gas valve A in Fig 1 controls the gas inflow to the boiler burner Le Fig 1 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 PEN Nomenclature of the parts Fig 2 1 Modulation operator s electric connectors Minimum gas pressure adjustment On off operat
42. rnthe 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 23 Modulating gas valve HN Checks NN Warning isolate the boiler from the mains electricity supply before removing any covering or component r Check the modulation operator coil 1 Remove the front panel of the case 2 Disconnect the connectors B Fig 5 from the modulating operator and measure the electrical resistance of the coil Its electrical resistance value must be approx 80 2 r Check the on off operators coils 1 Remove the front panel of the case 2 Disconnect the electrical connector C Fig 5 3 Measure the electrical resistance between the connector pins of the on off operators as illus trated in Fig 3 Upper on off operator approx 6 400 Q Lower on off operator approx 920 Q at ambient temperature Fig 3 DEN Removal of the on off operators coils NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the front panel of the case as explained in the section 2 3 of this manual 2 Disconnect the connector D Fig 4 3 Unscrew the screw E and remove on off
43. rse order The M90E 24S model is factory fitted with a 10 litre min 28 14 Temperature probe EAN 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 1 Q 12500 12000 11500 11000 10500 10000 9500 9000 8500 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 C Fig 1 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 2 and Fig 3 one on its input before the pump d h w Temperature probe B in Fig 2 and Fig 4 s Ir NY A 69 LA leal a MES Jail W b t 9 ic rr ag h Inle return s J cn dnw A t Fig 2 EEJ Checks Temperature resistance relationship NN Warning isolate the boiler from the mains electricity supply before removing any covering or comp
44. th full sequence ignition device type ceza External controls Electrical Fan Air pressure Safety Flame detection ignition terminal block supply terminal switch thermostat electrode electrodes block COM 3 2 1 LON gr f ah ahh EAN e NO b c nm m g v c gv c n n gr GQ Modulating gas valve 2 bc c y Q r r N N Kc 1 Ae 3 rh O DHW temperature DHW flow CH temperature Primary l probe NTC switch probe NTC pressure switch Three way diverter valve Time switch Pump m brown b white a orange c blue r red g yellow n black gr grey g v yellow green v green Diagrams Circuit voltages Eletric supply 3 way diverter terminal block valve Fan E rF u S l Be i N w Pump Modulating Safety Gas valve thermostat during c h or d h w operation Electrical voltages with burner on C only during c h operation gt only during d h w operation uonouni m y p uo uolle19do BLUON 9 Yd UO
45. ton C repeatedly 4 times until the lamps E give the indication as in Fig 15 igni tion pressure adjustment mode O Where Lamp OFF e Lamp ON Fig 15 13 Turn the knob B to the minimum fully counter clockwise and then on the position correspon ding to the position obtained on step 8 By turning the knob B the lock out signal lamp D blinks quickly 2 per second indicating that the setting has changed and must be memorised 14 To memorize the setting keep pressed the reset button C for about 5 seconds until the lights E briefly blinks simultaneously 15 To reset the boiler to the normal operation turn it OFF and ON by the function selector knob A checking the ignition pressure and that the burner lights up uniformly In any case the boiler automatically resets to its normal operation after 10 minutes CEN Adjustment of useful c h output This adjustment does not influence the maximum use ful output delivered during the d h w operating mode 1 Turn the boiler OFF 2 Remove the front panel of the case 3 Open the gas valve outlet pressure test point 8 see section 10 2 and connect the gauge 4 Turn the boiler ON positioning the function selec tor knob A as indicated in Fig 16 and ensure that the timer selector switch and room thermostat if fitted are set to heat demand Run the boiler in c h mode do not open any d h w tap 17 Electronic starting control p c b 5 Keep p
46. trol S D h w panel k flow switch DEE Hydraulic diagram Central heating c h operation a2 Y t C h water return C h water flow Expansion vessel Domestic hot water d h w operation 2 N A t D h w inlet D h w outlet 2 General access and emptying hydraulic circuits EXI Nomenclature Fig 1 1 Right side panel Front panel Control panel lid Control panel cover Service panel O a W N Left side panel PFI Body panels NN Warning isolate the boiler from the mains electricity supply before removing any covering or component For the most part of the check and maintenance oper ations it is necessary to remove one or more panels of the case The side panels can be removed only after the removal of 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 panels loosen the screws B and C Fig 3 bring the base of the panels away from the boiler and lift them freeing them from the top hooks Fig 3 bottom view of the boiler PEN Control panel NN Warning isolate the boiler from the mains electricity supply before removing any covering or component To gain access to the parts located inside the control panel proceed as follows 1 Remove the front panel oft
47. trol panel fascia and it gives information during the normal operation of the boiler The other two lamps are normally switched off The following table gives the relationship between the visible lamp indication and its meaning 15 Electronic starting control p c b Boiler in stand by condition function control in O position Anti freeze system active Boiler ON condition function control in or position E 1 second ON 1 second OFF Faulty boiler or irregular operation as Xk Xk XY O YS O FUEL Very fast pulses 4 per second Empty primary circuit No primary circuit flow Lack of burner ignition Excessive temperature in the primary circuit Faulty temperature probe Faulty air pressure switch EXE Setting the boiler control function modes It is possible to select the various boiler control function modes by using the function selector knob A and the D h w temperature control knob B Fig 5 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 Fig 5 EX 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 6 Fig 6 2 Keep pressed the reset button C for about
48. ug onen JOLONIC lll dund J Bueuox jesy muy g no w u q noo y o s did an au iddns sey au Ajddns Jamogy pau dure peusis no 4907 joajeg 1 uas1B due uonelado aguelddy ool SL cl sel ott YOL 016 28 cL syeyoesq Ul J 1 lou Jenuew y jo uono s y y 0 sjuauoduoo 5 Primary heat exchanger EX Characteristics The primary heat exchanger A in Fig 1 has the function of transferring heat produced from combustion of the gas tothe water circulating in it Os Fig 1 The hydraulic circuit is composed of 8 elliptical pipes comected in parallel Fig 2 Fig 2 EFI Removal NN Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 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
49. ween 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 3 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 12 Spindle B not visible RO 9 4 Kohm re red Open circuit bu blue x 3 0 bk black 2 gt Fig 2 D h w mode N Spindle B visible e Open circuit re red bu blue NE bk black gt o ola 9 4 Kohm Fig 3 C h mode EEJ 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 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 2 or to the wiring diagram in section 3 1 for the correct wiring connection Three way diverter valve Fig 4 EX Removal of the diverter group and its internal parts 1 Remove the front and both sid
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