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

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

Wall hung, fanflue, roomsealed, high efficiency gas boiler
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Wall hung, fanflue, roomsealed, high efficiency gas boiler
Service manual
Riva Plus HE
Models
M296.24SR/C
M296.28SR/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.
41-583-18
41-583-19
SyStEM boilER
SyStEM boilER

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

  • Page 1 Wall hung, fanflue, roomsealed, high efficiency gas boiler Service manual Riva Plus HE Models G.C. Appl. No. M296.24SR/C 41-583-18 SyStEM boilER M296.28SR/C 41-583-19 SyStEM 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 10 primary circuit flOw switch .

  • Page 4: Overall Information

    OVERALL INFORMATION Overall infOrmatiOn 1 .1 Overall view Air pressure Flue temperature sensor probe NTC Condensing heat exchanger Main heat exchanger Expansion vessel Combustion chamber Safety thermostat Burner C.H. temp. probe Ignition electrodes Automatic air release Detection valve electrode Condensate Combustion trap chamber over heat...

  • 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 H (Figure 2.7). figure 2 .4 5 Remove the screws E and remove the service panel (Figure 2.5); 6 To gain access to the electronic regulation PCB remove the screws F and remove the control panel lid (Figure 2.5);...

  • Page 7: Diagrams

    DIAGRAMS diaGrams 3 .1 wiring diagram Electric supply External controls Pump Ignition Flame detection terminal block terminal block electrodes electrode Air pressure sensor Primary circuit flow switch gnye bu bn gnye gnye bu bk bu bk bk gnye bn bu bu bu gnye Combustion...

  • Page 8: Circuit Voltages

    DIAGRAMS 3 .2 circuit voltages Electrical voltages with burner on during c.h. or d.h.w. operation Pump Supply network Modulating Gas valve pressure Safety thermostat sensor figure 3 .2 - 8 -...

  • Page 9: Fault Finding

    FAult Finding fault findinG - 9 -...
  • Page 10 FAult Finding - 10 -...

  • Page 11: 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 12: 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 13 Condensing heat exChanger If there are deposits of soot or dirt on the exchanger lid, clean with a brush or non-metallic bristle brush. In any case, avoid any actions that can damage the protective varnish with which the lid has been covered. figure 6 .3 4 Reassemble the exchanger carrying out the removal opera- tions in reverse order.

  • Page 14: Pump

    PUMP pump If there is a defect in starting, the rotor will begin to turn normally only starting it manually. 7 .1 function The pump A in Figure 7.1 and Figure 7.3 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 15: Removal Electrical Capacitor

    PUMP 4 Remove the capacitor connection block N freeing it from the hook O and pulling it as indicated by the arrow (Fig. 7.6). figure 7 .5 figure 7 .3 8 Unscrew the two screws G that hold the pump on the frame and remove the pump.

  • Page 16: Electronic Control/Ignition P.c.b

    ElEctronic control/ignition p.c.b. electrOnic cOntrOl/iGnitiOn p .c .b . working temperature limits foreseen. Generally, the Electronic control/ignition p.c.b. receives inlet 8 .1 function information coming from the boiler (the sensors) or from the outside (knobs, room thermostat, etc.), processes it and conse- quently acts with outlet commands on other components of the Inlet Information boiler (Figure 8.1).

  • Page 17: Checking The Temperature

    ElEctronic control/ignition p.c.b. figure 8 .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 Service knob 12 Appliance operation lights 13 x8 connector...

  • Page 18: Setting The Boiler Control Function Modes

    ElEctronic control/ignition p.c.b. 4 Turn the boiler OFF positioning the function selector A as in- dicated in Figure 8.5. Normally operating boiler (see the previous table for details) C.h. operation Frost protect operation Faulty c.h. temperature probe NTC Faulty flue temperature probe NTC figure 8 .5 Faulty primary circuit 5 Disconnect the electrical connectors C of the c.h.

  • Page 19: Only Mode Setting

    ElEctronic control/ignition p.c.b. 10 To memorize the setting keep pressed the reset button D for about 5 seconds until the lights F briefly blinks simultane- ously. 11 Press the reset button D once until the lamps F give the indi- cation as in Figure 8.9 (useful output, second step).

  • Page 20: Reignition Frequency Setting

    ElEctronic control/ignition p.c.b. M296.24SR/C M296.28SR/C 4 flashes 5 1/2 1 1/2 1 flash 8 1/2 Delay (minutes) Setting No. figure 8 .16 figure 8 .19 10 Turn the water control to minimum. Lock-out lamp blinks (2 per second) indicating the setting has changed 5 To memorize the setting keep pressed the reset button D for 11 To change the setting turn the knob B on a position corre- about 5 seconds until the lights F briefly blinks simultane-...

  • Page 21: Checks

    ElEctronic control/ignition p.c.b. Start the boiler until the burner is ignited. With the burner firing, interrupt the gas supply. The Electronic Lamp OFF Where: control/ignition p.c.b. must carry out three complete ignition cy- cles and then, after about 3 minutes, goes to lock-out state. Flashing lamp, alone or simultaneously By turning the boiler on and off by means of the function switch...

  • Page 22: Thermal Control In The Mode

    ElEctronic control/ignition p.c.b. edge and ensure that no wiring is trapped beneath. attention 8 Insert the spindles in the control panel knobs until the notch A After installing the Electronic control/ignition p.c.b. : (Figure 8.26) reaches the potentiometer edge. It is not neces- 10 Make sure the c.h.

  • Page 23: Ignition And Control Sequence

    ElEctronic control/ignition p.c.b. 8 .13 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 24: Modulating Gas Valve

    Modulating gas valve mOdulatinG Gas valve 9 .1 function The Modulating gas valve A in Figure 9.1 controls the gas inflow to the boiler burner. figure 9 .2 9 .3 adjustment for the pressure values refer to the technical data section of the user manual and installation instructions . warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent .

  • Page 25: Checks

    Modulating gas valve (by rotating clockwise the pressure increases). 10 Turn the boiler off and re-connect the wire to the modulating operator. 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 adjust- ment operations, all of the test points must be sealed and replace the adjustment protection cap .

  • Page 26: Primary Circuit Flow Switch

    Primary circuit flow switch primary circuit flOw switch 10 .3 removal warning: isolate the boiler from the mains electrici- 10 .1 function ty supply before removing any covering or compo- The Primary circuit pressure switch (A in Figure 10.1) function nent .

  • Page 27: Expansion Vessel And Temperature-Pres

    Expansion vEssEl and tEmpEraturE-prEssurE gaugE expansiOn vessel and temperature- pressure GauGe 11 .1 function The Expansion vessel (I in Figure 10.1) function is to allow for the volume expansion of the c.h. circuit water due to the temperature rise. 11 .2 checks figure 11 .2 3 Re-assemble the parts in reverse order of removal.

  • Page 28: Temperature Probe

    TemperaTure probe temperature prObe 12 .2 checks Sensor operation 12 .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 29: By-Pass Valve

    By-pass valve by-pass valve 4 Reassemble the by-pass valve as illustrated in Figure 13.2 reversing the order of removal. 13 .1 function The By-pass valve A in Figure 13.1 is located between the c.h. warning: to lubricate the O-ring gaskets exclusively water flow and return and its function is that of guaranteeing a use a silicone base grease compatible to be in con- minimum flow across the primary heat exchanger if the circula-...

  • Page 30: Fan And Air Pressure Sensor

    Fan and air pressure sensor fan and air pressure sensOr 14 .1 function The function of the Fan A (Figure 14.1 and Figure 14.2) 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 31: Removal Of The Fan

    Fan and air pressure sensor 14 .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 14.4).

  • Page 32: 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- 15 .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.

  • Page 33: Safety Thermostat

    Safety thermoStat safety thermOstat 16 .3 removal warning: isolate the boiler from the mains electrici- 16 .1 function ty supply before removing any covering or compo- The safety thermostat A in Figure 16.1 and Figure 16.2 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 34: 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. 17 .1 function The Flue temperature probe NTC A in Figure 17.2 and Figure If not, the electronic control p.c.b.

  • Page 35: Condensate Trap

    Condensate trap cOndensate trap 18 .2 removal warning: isolate the boiler from the mains electrici- 18 .1 function ty supply before removing any covering or compo- The condensate trap A in Figure 18.1 and Figure 18.2 allows nent . the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combustion products.

  • Page 36: 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. M296.24SR/C) KI1004 102 Polidoro 173 - 149 Burner (mod. M296.28SR/C) KI1004 147 H74 - 599 Injectors for natural gas (mod.
  • Page 37 Short Spare partS liSt figure 19 .1 - 37 -...
  • Page 38 NOTE - 38 -...
  • Page 40 *1796215512* 17962.1551.2 1614 40A4 Biasi UK Ltd Commercial Road Leamore Enterprise Park WALSALL WS2 7NQ Sales Tel. 01922 714600 Tech. Service Tel. 01922 714636 www.biasi.co.uk...

This manual is also suitable for:

Riva plus he m296.28sr/c

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