Biasi RIVA PLUS HE 24C ERP Service Manual Download

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Wall hung, fanflue, roomsealed, high efficiency gas boiler

Service manual

Riva Plus HE ERP

Models

G.C. Appl. No.

RIVA PLUS HE 24C ERP 47-583-41 COMBI BOILER

RIVA PLUS HE 28C ERP 47-583-42 COMBI BOILER

Leave this manual adjacent to the gas meter

Warning:

Service / repairs must be carried out, only by a qualified Gas Safety

Registered Engineer, who will be responsible for the current Regulations for

gas appliances.

Note:

After servicing, complete the relevant Service Interval Record section of the

Benchmark Checklist of the user and installation manual.

Summary of Contents for RIVA PLUS HE 24C ERP

Page 1: ...P 47 583 42 COMBI BOILER Leave this manual adjacent to the gas meter Warning Service repairs must be carried out only by a qualified Gas Safety Registered Engineer who will be responsible for the current Regulations for gas appliances Note After servicing complete the relevant Service Interval Record section of the Benchmark Checklist of the user and installation manual ...

Page 2: ......

Page 3: ...c b 24 10 12 Thermal control in the mode 26 10 13 Thermal control in the mode 26 10 14 Ignition and control sequence 27 11 MODULATING GAS VALVE 28 11 1 Function 28 11 2 Nomenclature of the parts 28 11 3 Adjustment 28 11 4 Checks 29 11 5 Removal of the on off operators coils 29 11 6 Removal of the gas valve 29 12 PRIMARY CIRCUIT PRESSURE SWITCH 30 12 1 Function 30 12 2 Checks 30 12 3 Removal 30 13 ...

Page 4: ...p probe Expansion vessel Detection electrode valve Condensing Divertervalve Flue temperature probe NTC Primarycircuit Combustion chamber over heat heat exchanger Condensate trap pressureswitch Airpressur sensor C h temp probe D h w heat exchanger Figure 1 1 1 2 Hydraulic diagram Figure 1 2 Central heating c h operation Domestic hot water d h w operation C h waterflow C h waterreturn D h w inlet D ...

Page 5: ...move screws A Figure 2 2 lift the panel and remove it Figure 2 2 A To remove the side panels loosen the screws B and C Figure 2 3 bring the base of the panels away from the boiler and lift them freeing them from the top hooks Figure 2 3 D B C Bottom view of the boiler 2 3 Control panel Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent To gain ...

Page 6: ... remove the lid of the sealed chamber For this pur pose remove the front and side panels of the case remove the screws G as indicated in Figure 2 6 and remove the lid 2 5 Emptying the primary circuit 1 Close the c h circuit flow and return cocks 2 Remove the front and right panels of the boiler 3 Open the drain tap I Figure 2 7 until the boiler is completely emptied 4 Close drain tap again once th...

Page 7: ...lve Pump Fan M Primary circuit pressure switch Air pressure sensor D h w flow switch C h temperature probe NTC Modulating gas valve Safety thermostat Flue probe NTC D h w temperature probe NTC ye gy bn brown bu blue bk black wh white rd red gy grey gn green ye yellow vt violet og orange gnye green yellow bu bn gnye bu bu bk bu bu bn bu bk wh wh rd rd gn wh bk rd P rd ye gy rd gy ye gy gy bk bk ye ...

Page 8: ...C J1 1 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 3 15 A 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 sequ...

Page 9: ...tages with burner on during c h or d h w operation only during c h operation only during d h w operation Supply network 230 230 0 230 230 0 Pump 3 way 230 Modulating Gas valve diverter valve Safety thermostat 0 Fan 230 12 V DC Air sensor pressure 0 5 4 5 V DC ...

Page 10: ...button the boiler turns on and operates cor rectly J J 6 J J J 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 J ON By pressing the reset push button the boiler starts the ignition cycle The burner lights on the ignition sparks continue and the boiler locks again J J J J J J The boil...

Page 11: ...c h J J J J Water leaks from the safety valve when the boiler is off J J J Note Useful information can be obtained also from the optical indication given by the appliance oper ation lights see section 10 4 1 Check for 230V between line L and neutral N Verify the integrity of supply cable plug and external fuses Check the polarity of line and neutral connection 2 Verify the tightness of the gas sup...

Page 12: ... to disconnect it from the wiring Figure 5 3 F H N P J I K M E O G C B C D L 8 Loosen the connection L and move the pipe M downwards freeing it from the connection of the primary heat exchanger 9 Remove the clip N 10 Loosen the connection O 11 Free the pipe P from the connection of the condensing heat exchanger lift and rotate it towards right 12 Remove the heat exchanger by sliding it forwards 13...

Page 13: ...6 Completely loosen the connection G and slightly move the pipe H upwards 7 Remove the clip I 8 Loosen the connection J 9 Free the pipe K from the connection of the condensing heat exchanger lift and rotate it towards right 10 Using pliers remove the spring L moving it to wards right and disconnect the rubber pipe M 11 Rotate the exchanger as indicated by the arrow and remove it towards the front ...

Page 14: ...xchanger lid clean with a brush or non metallic bristle brush Figure 6 3 N O L M 4 Reassemble the exchanger carrying out the removal opera tions in reverse order Warning to lubricate the O ring gaskets exclusively use a silicone base grease compatible to be in con tact with foods and approved by the local water Au thorities Warning After cleaning or replacement as detailed above if it deemed neces...

Page 15: ...and remove the primary circuit pressure switch D by lifting it upwards It is not necessary to disconnect it from the wiring 5 Remove the clip E and remove the electric actuator F by pull ing it It is not necessary to disconnect it from the wiring Figure 7 3 B E F D C 6 Completely unscrew the two Allen key screws G Figure 7 4 which hold the exchanger to the plastic groups Figure 7 4 A G 7 Move the ...

Page 16: ... rotor With the boiler off remove the front and right hand side case pan els lower the control panel and empty the primary 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 8 3 Removal pump Warning isolate the boiler from the mains electricity supply before removing any covering or component 1 Remove the case...

Page 17: ...ion of the actuator B brass spindle when the boiler operates in c h mode In both figures the relationship between the position of the actua tor and the resistance of the motor windings the motor must be disconnected from the wiring is also given Figure 9 2 D h w mode bk black Open circuit 9 4 Kohm bk bu bn bu blue bn brown 230 V 0 V B Spindle visible Figure 9 3 C h mode bk black Open circuit 9 4 K...

Page 18: ... way diverter is correctly oriented by matching the reference G with the notch of the water group Figure 9 5 9 5 Removal of the diverter group 1 Remove the front and both side case panels 2 Empty the primary circuit and the d h w circuit of the boiler 3 Remove the electric actuator section Removal of the elec tric actuator page 17 4 Remove the fixing spring H Figure 9 6 and remove the pri mary cir...

Page 19: ...ed supplies the fan and checks its functioning by means of the signal coming from the air pressure sensor The Electronic control ignition p c b has a safety function 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 functioning of the boiler lock state and stop its functioning up to the re...

Page 20: ...iable elements 10 and 11 in Figure 10 2 of the electronic control p c b I f the power requested is lower than 40 of the maximum power output then control is achieved by switching 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 th...

Page 21: ...nd their meaning Normally operating boiler see the previous table for details 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 flue temperature probe NTC Faulty primary circuit no water or low c h pressure Faulty primary circuit absence of flow Faulty air pressur...

Page 22: ... ing the reset button D pressed for more than 5 seconds The lamps F will flash a number of times corresponding to the setting Figure 10 11 seven times for Riva Plus HE 24C ERP and Riva Plus HE 28C ERP Figure 10 11 1 4 7 Riva Plus HE 24C ERP Riva Plus HE 28C ERP 7 flashes Setting No B 12 To change the setting turn the knob B on a position corre sponding to the boiler model Figure 10 11 By turning t...

Page 23: ...r lamp 8 Rotate the knob B on a position corresponding to an ade quate ignition pressure Refer to the value indicated in the tables of the User Installa tion 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 function selector knob A as indicate...

Page 24: ... a fuse has blown replace it with one that has the same charac teristics after having identified the reason for failure 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 three complete ignition cy cles and then after about 3 minutes goes to lock out state By turning the boiler on and off b...

Page 25: ...fascia making sure of the contact between the boiler reset button B and the tab C Figure 10 24 Figure 10 24 A A B C Attention After installing the Electronic control ignition p c b 10 Make sure the c h and d h w temperature ad justment 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 11 Operate t...

Page 26: ... the circulator Operates motorised valve Supplies the ignition device NO Circulator off Operates motorised valve Ignition device off YES YES See functioning with the function control in the mode sec 10 13 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 ci...

Page 27: ... 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 sensor at work NO YES YES closes gas valve NO YES safety thermostat or flue temperatu...

Page 28: ...pressure adjustment 3 Modulation operator s electric connectors 4 On off operators electric connector 5 On off operators 6 Gas valve inlet pressure test point 7 Gas valve outlet pressure test point 8 Modulation operator Figure 11 2 7 8 6 4 5 1 2 3 11 3 Adjustment For the pressure values refer to the Technical data section of the User manual and Installation instructions Warning isolate the boiler ...

Page 29: ... Check the on off operators coils 1 Remove the front panel of the case 2 Disconnect the electrical connector E Figure 11 5 3 Measure the electrical resistance between the connector pins of the on off operators as illustrated in Figure 11 4 Figure 11 4 Lower on off operator approx 920 Ω Upper on off operator approx 6400 Ω at ambient temperature 11 5 Removal of the on off operators coils Warning iso...

Page 30: ...he electric resistance between the contacts C and N O of the switch 1 Measure the electrical resistance between the tabs marked C and N O Figure 12 2 The contact must close resistance zero with c h pressure of 0 35 bar or higher Figure 12 2 N O C 12 3 Removal Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent 1 Remove the front and right hand s...

Page 31: ...e above the boiler and the rear exit flue can be easily removed the expansion vessel can be changed without removing the boiler Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent 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 connectio...

Page 32: ...fore removing any covering or compo nent Figure 14 3 B C D E 1 Remove the front panel of the case 2 Disconnect the connectors B and remove the sensor holder C Figure 14 3 3 Remove the sensor 14 4 Checks Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent Sensor operation Figure 14 4 wh white 0 32 Hz without flow rate 33 200 Hz witht flow rate rd...

Page 33: ...gure 14 5 4 Reassemble the parts following the removing sequence in reverse order 14 6 Flow limiter The Riva Plus HE 24C ERP model is factory fitted with a 10 litres min flow limiter white To install the flow limiter 1 Remove the flow switch group as explained in the section 14 5 2 Rotate the flow switch plug 1 to separate it from the body 4 Figure 14 5 Figure 14 5 rotate insert 1 3 4 1 Insert the...

Page 34: ...ure probe Measure the temperature of the pipe C where the Tempera ture probe is located and check the electrical resistance ac cording to the graph in Figure 15 1 15 3 Removal of the c h temperature probe 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 Figure 15 3 A D C 2 Remove the elect...

Page 35: ...e removing any covering or compo nent 1 Remove all the case panels 2 Empty the primary circuit of the boiler 3 Remove the locking plate B and pull up the by pass valve A Figure 16 3 Figure 16 2 A B 4 Reassemble the by pass valve as illustrated in Figure 16 2 reversing the order of removal Warning to lubricate the O ring gaskets exclusively use a silicone base grease compatible to be in con tact wi...

Page 36: ...bout 43 Ω Riva Plus HE 24C ERP 25 Ω Riva Plus HE 28C ERP at ambient temperature Figure 17 2 A C B Check of the Air pressure sensor operation This test must be carried out with the sealed chamber closed 1 Remove the caps of the pressure test points located on the top of the boiler and connect a differential pressure gauge Figure 17 3 2 Switch on the boiler Figure 17 3 3 Run the boiler at minimum by...

Page 37: ...cement as detailed above if it deemed necessary to undertake a com bustion analysis refer to the appropriate chapter Maintenance of the installation instructions manual 17 4 Removal of the Air pressure sensor Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent 1 Remove all the case panels and the sealed chamber lid 2 Disconnect the wires I from ...

Page 38: ... supply before removing any covering or compo nent 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 con nect the electrodes to the ignition device 18 3 Removal Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent 1 Remove all the case panels the sealed ch...

Page 39: ...safety thermostat and no overheat intervention should occur Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent Electrical function 1 Remove all the case panels and the lid of the sealed cham ber 2 Disconnect the wiring B of the safety thermostat and check its electrical function Normally no intervention the contact must be closed electrical res...

Page 40: ...flue pipes are integral parts of the boiler If not the electronic control p c b attempts to light the burner and at the end locks the boiler and lights the lock out signal lamp Figure 20 3 A B 20 2 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 ...

Page 41: ...e trap and reaching the condensing heat exchanger When the condensate reaches the lower part of the exchanger obstructs the exhaust gas flow and the boiler stops no signal from the air pressure sensor 21 2 Removal Warning isolate the boiler from the mains electrici ty supply before removing any covering or compo nent 1 Remove the front and right case panels 2 Disconnect the trap from the draining ...

Page 42: ...hamber side panels 2 BI1326 100 10 E83 180 Combustion chamber rear panel mod Riva Plus HE 24C ERP 1 BI1326 107 E83 181 Combustion chamber rear panel mod Riva Plus HE 28C ERP 1 BI1326 108 11 H74 591 Combustion chamber front panel mod Riva Plus HE 24C ERP 1 BI1536 110 H74 592 Combustion chamber front panel mod Riva Plus HE 28C ERP 1 BI1536 111 12 Electronic regulation p c b 1 BI2015 105 Bertelli Par...

Page 43: ... 43 SHORT SPARE PARTS LIST 1 2 6 4 5 7 3 8 14 12 18 20 21 23 25 26 13 15 24 16 17 9 10 11 9 19 27 22 Figure 22 1 ...

Page 44: ...Biasi UK Ltd Commercial Road Leamore Enterprise Park WALSALL WS2 7NQ Sales Tel 01922 714600 Tech Service Tel 01922 714636 www biasi co uk 1796225140 17962 2514 0 4315 44A4 UK 19 10 2015 N ...

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