Biasi RIVA COMPACT M90E.24S Service Manual
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Biasi RIVA COMPACT M90E.24S Service Manual

Wall hung, fan flue, room sealed gas boiler
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Wall hung, fan flue, room sealed gas boiler
SERVICE MANUAL
RIVA COMPACT
Models:
M90E.24S
M90E.28S
M90E.32S
Leave this manual adjacent to the gas meter
G.C. Appl. No.
47--970--17
47--970--18
47--970--21
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

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Summary of Contents for Biasi RIVA COMPACT M90E.24S

  • Page 1 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...

  • Page 3: Table Of Contents

    Table of contents Modulating gas valve ....10.1 Function ......10.2 Nomenclature of the parts .

  • Page 4: Overall Information

    Overall information Overall View Air pressure switch Main heat Expansion vessel exchanger Safety thermostat Burner Combustion chamber Ignition electrodes Detection electrode Diverter valve Automatic D.h.w. air release heat exchanger valve Main circuit flow switch D.h.w. temp. probe Pump Gas valve D.h.w Control flow switch...

  • Page 5: General Access And Emptying Hydraulic Circuits

    General access and emptying hydraulic circuits Nomenclature 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.

  • Page 6: Access To The Sealed Chamber

    General access and emptying hydraulic circuits 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.

  • Page 7: Diagrams

    Diagrams Wiring diagram Wiring diagram for boiler equiped with full sequence ignition device type: ceza Air pressure Safety Flame detection ignition External controls Electrical switch electrode electrodes thermostat supply terminal terminal block block g/v c gr n Modulating gas valve r c n DHW temperature DHW flow...

  • Page 8: Circuit Voltages

    Diagrams Circuit voltages Eletric supply 3 way diverter terminal block valve Modulating Safety Pump Gas valve thermostat during c.h. or d.h.w. operation Electrical voltages with burner on only during c.h. operation only during d.h.w. operation...

  • Page 11: Primary Heat Exchanger

    Primary heat exchanger Characteristics The primary heat exchanger A in Fig. 1 has the function of transferring heat produced from combustion of the gas to the water circulating in it. Fig. 3 Unscrew the connection H (Fig. 4), lift the pipe I and rotate it right then move it downwards freeing it from the heat exchanger connection.

  • Page 12: H.w. Heat Exchanger

    D.h.w. heat exchanger Removal Warning: isolate the boiler from the mains Function electricity supply before removing any covering or component. The d.h.w heat exchanger A in Fig. 1 allows the instan- taneous transfer of heat from the primary hydraulic cir- Remove the front and right hand side panels of cuit to the water destined for d.h.w use.

  • Page 13: Pump

    Pump Check that the impeller is integral with the rotor. With the boiler off remove the front and right hand side Function case panels, lower the control panel and empty the pri- mary circuit. The pump A in Fig. 1 has the function of making the Remove the pump head by undoing the screws which water in the main circuit circulate through the main heat hold it to the pump body and check that the impeller is...

  • Page 14: Function

    Three way diverter valve Function Spindle B The diverter valve A (Fig. 1) has the function of modify- not visible 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.

  • Page 15: Removal Of The Diverter Group And Its Internal Parts

    Three way diverter valve Unscrew the screw L and remove the diverter group. Fig. 4 Removal of the diverter group and its Fig. 6 Rear view of the boiler internal parts Refer to the exploded view in Fig. 7 to remove the Remove the front and both side case panels.

  • Page 16: Electronic Starting Control P.c.b

    Electronic starting control p.c.b. 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 Function water for d.h.w. use) and operating in order to keep the temperature of the hydraulic circuits constant.

  • Page 17: Checking The Temperature

    Electronic starting control p.c.b. Connector J7 c.h. temperature probe NTC, When the boiler functions in d.h.w. (Fig. 4), the signal coming from the d.h.w. temperature probe is compared primary circuit flow switch, modulating gas valve with the signal given by the control panel through the Connector J6 d.h.w.

  • Page 18: Setting The Boiler Control Function Modes

    Electronic starting control p.c.b. Boiler in stand --- by condition. (function control in position) position). Anti--- freeze system active. A short pulse every 4 seconds Boiler ON condition (function control in position) position) 1 second ON 1 second OFF Faulty boiler or irregular operation as: --- Empty primary circuit Very fast pulses (4 per second)

  • Page 19: Adjustment Of Useful C.h. Output

    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. 14 Keep pressed the reset button C for about 10 sec- onds until the lock ---out signal lamp D blinks.

  • Page 20: Gas Conversion

    Electronic starting control p.c.b. Keep pressed the reset button C for about 10 sec- Press the reset button C repeatedly (2 times) until onds until the lock ---out signal lamp D blinks. the lamps E give the indication as in Fig. 21 (use- ful c.h.

  • Page 21: Checks

    Electronic starting control p.c.b. 9.10 Connect the C.h. temperature probe NTC Checks (Fig. 23) Check that the fuse is complete If the 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.
  • Page 22 Electronic starting control p.c.b. meter edge. It is not necessary to force them in Attention the knob. After installing the Electronic starting control p.c.b. : While tightening the screws that fix the Electronic starting control p.c.b. on the control panel, keep Make sure the c.h.

  • Page 23: Mode

    Electronic starting control p.c.b. 9.12 Thermal control in the ” ” mode Taking See functioning with the function Is primary circuit control in the mode water from the domestic hot temperature higher than that water circuit? selected? (sec. 9.13 ) Circulator off Starts the circulator Operates motorised valve...

  • Page 24: Thermal Control In The

    Electronic starting control p.c.b. 9.13 Thermal control in the ” ” mode Switch in the function mode Taking Circulator off water from the domestic hot Circulator on Ignition device off water circuit? Is domestic hot water outlet temperature Ignition device off lower than that required? lock memorised?

  • Page 25: Modulating Gas Valve

    Modulating gas valve 10.1 Function The Modulating gas valve A in Fig. 1 controls the gas inflow to the boiler burner. Fig. 2 10.3 Adjustment Warning: isolate the boiler from the mains electricity supply before removing covering or component. Remove the front panel of the case. Open the gas valve inlet pressure test point (6 in Fig.
  • Page 26 Modulating gas valve 10.4 10.6 Checks Removal of the gas valve Warning: isolate the boiler from the mains Warning: isolate the boiler from the mains electricity supply before removing electricity supply before removing covering or component. covering or component. Check the modulation operator coil Remove the front panel of the case.

  • Page 27: Checks

    Primary circuit flow switch 11.2 Checks Warning: isolate the boiler from the mains 11.1 Function electricity supply before removing any covering or component. The Primary circuit flow switch (A in Fig. 1) function is to detect water flowrate through the primary hydraulic Mechanical function circuit of the boiler.

  • Page 28: Checks

    Primary circuit flow switch Warning: isolate the boiler from the mains electricity supply before removing any covering or component. Remove the front and left hand side panels of the case, turn off the flow and return isolation valves and empty the primary circuit. Completely unscrew the connection K, the lock- nut L (Fig.

  • Page 29: Flow Switch, Filter And Flow Limiter

    D.h.w. flow switch, filter and flow limiter 13.2 Nomenclature and location of parts (Fig. 3) 13.1 Function Flow switch sensor The d.h.w. flow switch A in Fig. 1 is a device that gener- Body ates an electrical signal when hot water is drawn. O---ring Spring Magnetic ring...

  • Page 30: Flow Limiter

    Reassemble the parts following the removing se- it from the body 2. quence in reverse order. Reassemble the group following the above se- 13.6 Flow limiter quence in reverse order. The M90E.24S model is factory fitted with a 10 litre/min.

  • Page 31: Temperature Probe

    Temperature probe 14.2 Checks Temperature---resistance relationship 14.1 Function Warning: isolate the boiler from the mains The Temperature probe has the function of converting electricity supply before removing any the temperature of the water in the hydraulic circuit covering or component. where it is installed into an electrical signal (resistance).

  • Page 32: Removal

    By---pass valve 15.2 Removal 15.1 Function Warning: isolate the boiler from the mains electricity supply before removing any The By---pass valve A in Fig. 1 is located between the covering or component. c.h. water flow and return and its function is that of guar- anteeing a minimum flow across the primary heat ex- Remove all the case panels.

  • Page 33: Fan, Venturi Device And Air Pressure Switch

    Compare the value on the gauge with the follow- ing minimum values: Fig. 1 Check of the Air pressure switch operation 90 Pa (0,9 mbar) --- M90E.24S 100 Pa (1,0 mbar) --- M90E.28S Warning: isolate the boiler from the mains 130 Pa (1,3 mbar) --- M90E.32S electricity supply before removing any covering or component.

  • Page 34: Inspection And Removal Of The Venturi

    Unscrew the screws D and remove the clamp E Inspect the venturi device A and the connection (Fig. 4). pipe H. Ensure they are clean. 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.

  • Page 35: Ignition And Detection Electrodes

    C (see Fig. 2 on page 35). 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.
  • Page 36 Ignition and detection electrodes Extract the electrodes from the burner. Assemble the electrodes carrying out the 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 edge of the detection electrode is longer than the one of the ignition electrodes.

  • Page 37: Safety Thermostat

    Safety thermostat contact must be closed (electrical resistance zero Ω). 18.1 Function 18.3 Removal The safety thermostat A in Fig. 1 is a device that senses Warning: isolate the boiler from the mains the temperature of the primary circuit water which flows in the outlet pipe of the primary heat exchanger.
  • Page 38 Safety thermostat...

  • Page 39: Short Spare Parts List

    Polidoro 173---149 Burner (mod. M90E.28S) KI1004 147 Burner (mod. M90E.32S) BI1193 100 169---069 Injectors for natural gas (mod. M90E.24S) KI1064 505 Polidoro Injectors for natural gas (mod. M90E.28S) Injectors for natural gas (M90E.32S) BI1193 500 169---070 Injectors for LPG (mod. M90E.24S) KI1064 506 Injectors for LPG (mod.
  • Page 40 Short spare parts list...
  • Page 44 *1796209167* 17962.0916.7 1908 44A4 UK...

This manual is also suitable for:

Riva compact m90e.28sRiva compact m90e.32s

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