Biasi Riva Plus HE M296.24SM/C Service Manual
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Biasi Riva Plus HE M296.24SM/C Service Manual

Biasi Riva Plus HE M296.24SM/C Service Manual

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Wall hung, fanflue, roomsealed, high efficiency gas boiler
Service manual
Riva Plus HE
Models
M296.24SM/C
M296.28SM/C
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.
G.C. Appl. No.
47-583-24
47-583-25
CoMbi boilER
CoMbi boilER

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Summary of Contents for Biasi Riva Plus HE M296.24SM/C

  • Page 1 Wall hung, fanflue, roomsealed, high efficiency gas boiler Service manual Riva Plus HE Models G.C. Appl. No. M296.24SM/C 47-583-24 CoMbi boilER M296.28SM/C 47-583-25 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.

  • Page 3: Table Of Contents

    TAblE of CoNTENTS 1 ovERAll iNfoRMATioN ....4 12 PRiMARy CiRCuiT PRESSuRE SWiTCH ..31 Overall View ....... .4 12.1 Function .

  • Page 4: Overall Information

    ovERAll iNfoRMATioN ovERAll iNfoRMATioN 1.1 overall view Airpressur sensor Flue temperature probe NTC Condensing heat exchanger Mainheat Expansion exchanger vessel Safety Combustion thermostat chamber Burner C.h.temp. probe Ignition electrodes Automatic Detection air release electrode valve Combustion chamber over heat Condensate trap Primarycircuit pressureswitch...

  • Page 5: General Access And Emptying Hydraulic

    GENERAl ACCESS ANd EMPTyiNG HydRAuliC CiRCuiTS GENERAl ACCESS ANd EMPTyiNG HydRAuliC CiRCuiTS 2.1 Nomenclature figure 2.2 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.

  • Page 6: Access To The Sealed Chamber

    GENERAl ACCESS ANd EMPTyiNG HydRAuliC CiRCuiTS 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 the emptying has been complet- figure 2.4 5 Remove the screws E and remove the service panel (Figure 2.5);...

  • Page 7: Diagrams

    diAGRAMS diAGRAMS 3.1 Wiring diagram Electric supply External controls Three way Pump Ignition Flame detection terminal block terminal block diverter valve electrodes electrode Air pressure sensor Primary circuit pressure switch bk bu bn gnye bu bn gnye gnye bu bk bn bu bk bu bk bk gnye...

  • Page 8: Functional Flow Diagrams

    diAGRAMS 3.2 Functional flow diagrams General layout Electronic control p.c.b. (low voltage section) J1--- 1 Fuse 3,15 A Transformer J3--- 5 J3--- 4 J3--- 3 Three way diverter valve J1--- 2 Pump J3--- 1 J3--- 2 J2--- 5 J2--- 4 Full sequence ignition device Heat request on d.h.w.

  • Page 9: Circuit Voltages

    diAGRAMS 3.3 Circuit voltages during c.h. or d.h.w. operation Electrical voltages with burner on only during c.h. operation only during d.h.w. operation Pump Supply network 3 way diverter valve Modulating Gas valve pressure Safety thermostat sensor figure 3.3 - 9 -...

  • Page 10: Fault Finding

    fAulT fiNdiNG fAulT fiNdiNG - 10 -...
  • Page 11 fAulT fiNdiNG - 11 -...

  • Page 12: Primary Heat Exchanger

    PRiMARy HEAT ExCHANGER PRiMARy HEAT ExCHANGER 5.1 function The primary heat exchanger A in Figure 5.1 has the function of transferring heat produced from combustion of the gas to the water circulating in it. figure 5.1 The hydraulic circuit is composed of 8 elliptical pipes connected in parallel (Figure 5.2).

  • Page 13: Condensing Heat Exchanger

    CoNdENSiNG HEAT ExCHANGER CoNdENSiNG HEAT ExCHANGER 6.1 function The return water flows through the condensing heat exchanger A in Figure 6.1 and Figure 6.2. By reducing the combustion products temperature, the latent heat of the vapour is transferred to the water circuit, allowing an extra gain of useful heat. The condensed vapour is then drained through the condensate trap B and the draining pipe C.

  • Page 14: Cleaning

    CoNdENSiNG HEAT ExCHANGER 6.3 Cleaning 1 Using pliers, remove the spring L moving it to wards right and disconnect the rubber pipe M (Figure 6.3). 2 Unscrewing the screws N (Figure 6.3). 3 Remove the condensing heat exchange lid O (Figure 6.3) moving towards the front of the boiler.

  • Page 15: D.h.w. Heat Exchanger

    d.H.W. HEAT ExCHANGER d.H.W. HEAT ExCHANGER 7.1 function The d.h.w heat exchanger A in Figure 7.1 and Fig. 4 allows the instantaneous transfer of heat from the primary hydraulic circuit to the water destined for d.h.w use. figure 7.3 6 Completely unscrew the two Allen key screws G (Figure 7.4) which hold the exchanger to the plastic groups.

  • Page 16: Pump

    PuMP PuMP If there is a defect in starting, the rotor will begin to turn normally only starting it manually. 8.1 function The pump A in Figure 8.1 and Figure 8.4 has the function of Check that the impeller is integral with the rotor. making the water in the main circuit circulate through the main heat exchanger, the condensing heat exchanger and therefore With the boiler off remove the front and right hand side case pan-...

  • Page 17: Removal Electrical Capacitor

    PuMP 8.4 Removal electrical capacitor Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent. 1 Remove the front and right hand side case panels. 2 Disconnect the connector B (Figure 8.4) following the indica- tions given on the connector box.

  • Page 18: Three Way Diverter Valve

    THREE WAy divERTER vAlvE THREE WAy divERTER vAlvE 9.1 function The diverter valve A (Figure 9.1) has the function of modifying 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 exchanger towards the c.h.

  • Page 19: Removal Of The Tree Way Diverter Valve

    THREE WAy divERTER vAlvE 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 20: Electronic Control/Ignition P.c.b

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. ElECTRoNiC CoNTRol/iGNiTioN P.C.b. operating in order to keep the temperature of the hydraulic cir- cuits constant. 10.1 function This is obviously possible within the useful power and maximum working temperature limits foreseen. Inlet Information Generally, the Electronic control/ignition p.c.b. receives inlet information coming from the boiler (the sensors) or from the Electronic control/ignition...

  • Page 21: Checking The Temperature

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. figure 10.2 1 x1 connector 2 x6 connector 3 x7 connector 4 x4 connector 5 x2 connector 6 x15 connector 7 x11 connector 8 Lock-out signal lamp 9 Boiler reset button 10 Function control / C.h. temperature adjustment 11 D.h.w.

  • Page 22: Operation Lights

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. Normally, the result of the comparison between these two sig- nals directly operates the adjustment elements of the gas valve Faulty air pressure sensor modulation device, adjusting the useful output generated in order to stabilize the temperature of the exiting water. Lack of burner ignition (no ignition signal from the full sequence ignition device) If during the d.h.w.

  • Page 23: Reignition Frequency Setting

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. At this step it is possible to visualize the current setting by keep- 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 (once for M296.24SM/C and M296.28SM/C). M296.24SM/C M296.28SM/C 7 flashes Setting No.

  • Page 24: Ignition Gas Pressure Adjustment

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. By turning the knob B, the lock-out signal lamp E blinks quick- Where: Lamp OFF ly (2 per seconds) indicating that the setting has changed and must be memorised. Flashing lamp, alone or simultaneously with an other lamp. 5 1/2 figure 10.17 1 1/2...

  • Page 25: Checks

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. 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 by means of the function switch the device must not unlock and the burner must not turn on.
  • Page 26 ElECTRoNiC CoNTRol/iGNiTioN P.C.b. important When re-assembling the Electronic control/ignition p.c.b.: 7 Fit the p.c.b. into the control panel by first inserting 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 until the notch A (Figure 10.24) reaches the potentiometer edge.

  • Page 27: Thermal Control In The Mode

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. 10.12 Thermal control in the mode Switch in the function mode Taking See functioning with the function control in the mode water from the domestic hot water circuit? (sec. 10.13) Is primary circuit temperature higher than that selected? Request for heat from room thermostat?

  • Page 28: Ignition And Control Sequence

    ElECTRoNiC CoNTRol/iGNiTioN P.C.b. 10.14 ignition and control sequence Ignition request lock memorised? cancels lock Air pressure sensor at rest? starts fan Air pressure sensor at work? beginning of wait period presence of flame? Air pressure sensor at work? starts ignition discharges opens gas valve beginning of ignition period flame presence?

  • Page 29: Modulating Gas Valve

    ModulATiNG GAS vAlvE ModulATiNG GAS vAlvE 11.1 function The Modulating gas valve A in Figure 11.1 controls the gas inflow to the boiler burner. figure 11.1 figure 11.2 By means of an electric command given to the on-off operators the passage of the gas through the Modulating gas valve can be 11.3 Adjustment opened or closed.

  • Page 30: Checks

    ModulATiNG GAS vAlvE 5 Remove the protection cap B (Figure 11.3) from the me- chanical pressure adjustment components levering with a flat screwdriver in the slots C. 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 if the test is carried out in c.h.

  • Page 31: Primary Circuit Pressure Switch

    PRiMARy CiRCuiT PRESSuRE SWiTCH PRiMARy CiRCuiT PRESSuRE SWiTCH 12.3 Removal Warning: isolate the boiler from the mains electrici- 12.1 function ty supply before removing any covering or compo- The Primary circuit pressure switch (A in Figure 12.1) function nent. is to check the presence of water in the primary hydraulic circuit and that the pressure is above the minimum.

  • Page 32: Expansion Vessel And Temperature-Pres

    ExPANSioN vESSEl ANd TEMPERATuRE-PRESSuRE GAuGE ExPANSioN vESSEl ANd TEMPERATuRE- PRESSuRE GAuGE 13.1 function The Expansion vessel (D in Figure 12.1 function is to allow for the volume expansion of the c.h. circuit water due to the tem- perature rise. 13.2 Checks 1 Turn off the flow and return isolation valves and empty the primary circuit of the boiler.

  • Page 33: 14 D.h.w. Flowmeter, Filter And Flow Limiter

    d.H.W. floW SWiTCH, filTER ANd floW liMiTER d.H.W. floWMETER, filTER ANd floW liM- iTER 14.1 function The d.h.w. flowmeter A in Figure 14.1 is a device that generates an electrical signal when hot water is drawn. figure 14.3 1 Remove the front panel of the case. 2 Disconnect the connectors B and remove the sensor holder C (Figure 14.3).

  • Page 34: Flow Limiter

    d.H.W. floW SWiTCH, filTER ANd floW liMiTER 1 Remove the front panel of the case and empty the d.h.w. cir- cuit. 2 Remove the fork D and pull up the flow switch plug E (Figure 14.3) with the help of a screwdriver. 3 To remove the body 4 with the filter from the flow switch group rotate the flow switch plug 1 (Figure 14.5). 4 Reassemble the parts following the removing sequence in reverse order.

  • Page 35: Temperature Probe

    TEMPERATuRE PRobE TEMPERATuRE PRobE 15.2 Checks Sensor operation 15.1 function The Temperature probe has the function of converting the tem- Warning: isolate the boiler from the mains electrici- perature of the water in the hydraulic circuit where it is installed ty supply before removing any covering or compo- into an electrical signal (resistance).
  • Page 36 TEMPERATuRE PRobE 4 Remove the electric connector F and unscrew the d.h.w. Temperature probe B (Figure 15.4). 5 Reassemble the d.h.w. temperature probe carrying out the removal operations 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.

  • Page 37: By-Pass Valve

    by-PASS vAlvE by-PASS vAlvE 16.1 function The By-pass valve A in Figure 16.1 is located between the c.h. water flow and return and its function is that of guaranteeing a minimum flow across the primary heat exchanger if the circula- tion across the c.h. system is completely closed. The By-pass valve is inside of the diverter group. figure 16.2 4 Reassemble the by-pass valve as illustrated in Figure 16.2 reversing the order of removal.

  • Page 38: Fan And Air Pressure Sensor

    fAN ANd AiR PRESSuRE SENSoR fAN ANd AiR PRESSuRE SENSoR 17.1 function The function of the Fan A (Figure 17.1 and Figure 17.2) is to force the products of combustion through the condensing heat exchanger 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.

  • Page 39: Removal Of The Fan

    fAN ANd AiR PRESSuRE SENSoR 17.3 Removal of the fan Pressure point P2 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 connectors C and the earth connection D (Figure 17.4).

  • Page 40: Ignition And Detection Electrodes

    iGNiTioN ANd dETECTioN ElECTRodES iGNiTioN ANd dETECTioN ElECTRodES Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- 18.1 function nent. Three electrodes are fitted on the burner. Two of them are the ignition electrodes and are fitted near the front part of the burner. 1 Remove all the case panels, the sealed chamber lid and the The ignition sparks take place between their metallic edges over combustion chamber lid.

  • Page 41: Safety Thermostat

    SAfETy THERMoSTAT SAfETy THERMoSTAT 19.3 Removal Warning: isolate the boiler from the mains electrici- 19.1 function ty supply before removing any covering or compo- The safety thermostat A in Figure 19.1 and Figure 19.2 is a de- nent. vice that senses the temperature of the primary circuit water which flows in the outlet pipe of the primary heat exchanger.

  • Page 42: Flue Temperature Probe Ntc

    fluE TEMPERATuRE PRobE NTC fluE TEMPERATuRE PRobE NTC The use of kits different from the original isn’t however al- lowed, since the flue pipes are integral parts of the boiler. 20.1 function The Flue temperature probe NTC A in Figure 20.2 and Figure If not, the electronic control p.c.b.

  • Page 43: Condensate Trap

    CoNdENSATE TRAP CoNdENSATE TRAP 21.2 Removal Warning: isolate the boiler from the mains electrici- 21.1 function ty supply before removing any covering or compo- The condensate trap A in Figure 21.1 and Figure 21.2 allows nent. the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combustion products.

  • Page 44: Short Spare Parts List

    SHoRT SPARE PARTS liST SHoRT SPARE PARTS liST Manufacturer Manufacturer’s Key G.C. part no. description Q.ty part no. reference 173 - 148 Burner (mod. M296.24SM/C) KI1004 102 Polidoro 173 - 149 Burner (mod. M296.28SM/C) KI1004 147 H74 - 599 Injectors for natural gas (mod. M296.24SM/C) BI1213 109 Polidoro Injectors for natural gas (mod.
  • Page 45 SHoRT SPARE PARTS liST figure 22.1 - 45 -...
  • Page 46 NoTE - 46 -...
  • Page 48 *1796215495* 17962.1549.5 0312 48A4 biasi uK ltd Commercial Road Leamore Enterprise Park WALSALL WS2 7NQ Sales Tel. 01922 714600 Tech. Service Tel. 01922 714636 www.biasi.co.uk...

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Riva plus he m296.28sm/c

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