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Wall hung, fan flue, room sealed gas boiler
SERVICE MANUAL
RIVA PLUS
Models:
M90D.24S
M90D.28S
M90D.24SR
M90D.28SR
Leave this manual adjacent to the gas meter
G.C. Appl. No.
47--970--15
47--970--16
41--970--08
41--970--09
Unit 31/33, Planetary Road
Industrial Estate, Neachells Lane
Willenhall, Wolverhampton WV 13 3XB
Technical helpline: 01902 304 400
Web site: www.biasi.co.uk
Biasi U.K. Ltd
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Table of Contents
Related Manuals for Biasi RIVA PLUS M90S.24S
Summary of Contents for Biasi RIVA PLUS M90S.24S
- Page 1 M90D.24S 47--970--15 M90D.28S 47--970--16 M90D.24SR 41--970--08 M90D.28SR 41--970--09 Leave this manual adjacent to the gas meter Biasi U.K. Ltd Unit 31/33, Planetary Road Industrial Estate, Neachells Lane Willenhall, Wolverhampton WV 13 3XB Technical helpline: 01902 304 400 Web site: www.biasi.co.uk...
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Page 3: Table Of Contents
Table of contents Modulating gas valve ....11.1 Function ......11.2 Nomenclature of the parts . -
Page 4: Overall Information
Overall information Overall View Air pressure switch Expansion Main heat exchanger vessel 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 M90D.24S M90D.28S Wiring diagram for boiler equiped with full sequence ignition device type: Bertelli & Partners FM30 Electric supply (alternative wiring colours) terminal block External controls Air pressure Ignition Flame detection Safety Safety terminal block switch electrodes electrode thermostat thermostat... - Page 8 Diagrams Wiring diagram for boiler equiped with full sequence ignition device type: Honeywell FPLD (alternative wiring colours) Electric supply terminal block Air pressure Ignition Flame detection Safety Safety switch electrodes electrode thermostat thermostat External controls terminal block gnye gnye Electronic control p.c.b.
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Page 9: Wiring Diagram M90D.24Sr, M90D.28Sr
Diagrams Wiring diagram M90D.24SR, M90D.28SR Wiring diagram for boiler equiped with full sequence ignition device type: Bertelli & Partners FM30 External controls Electric supply Safety Air pressure Ignition Flame detection terminal block terminal block thermostat switch electrodes electrode gnye gnye Electronic control p.c.b. - Page 10 Diagrams Wiring diagram for boiler equiped with full sequence ignition device type: Honeywell FPLD Electric supply Safety Air pressure Ignition Flame detection terminal block thermostat switch electrodes electrode gnye gnye Electronic control p.c.b. Full sequence ignition device gnye gnye Primary circuit CH temperature gnye flow switch...
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Page 11: Functional Flow Diagrams
Diagrams Functional flow diagrams General layout Electronic control p.c.b. (low voltage section) J1--- 1 Fuse 1,6A T 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 12: Circuit Voltages
Diagrams Circuit voltages Diagrams for boiler equiped with full sequence ignition device type: Bertelli & Partners FM30 during c.h. or d.h.w. operation Electrical voltages with burner on only during c.h. operation only during d.h.w. operation 230~ 230~ 230~ 230~ Pump 230~ Full sequence Ignition device... - Page 13 Diagrams Diagrams for boiler equiped with full sequence ignition device type: Honeywell FPLD during c.h. or d.h.w. operation Electrical voltages with burner on only during c.h. operation only during d.h.w. operation 230~ 230~ 230~ 230~ Pump 230~ Full sequence Ignition device 230~ 230~ 230~...
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Page 16: Primary Heat Exchanger
Primary heat exchanger Characteristics The primary heat exchanger A in Fig. 9 has the function of transferring heat produced from combustion of the gas to the water circulating in it. Fig. 11 Unscrew the connection H (Fig. 12), lift the pipe I and rotate it right then move it downwards free- ing it from the heat exchanger connection. -
Page 17: 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. 13 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 18: 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. 17 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 19: Three Way Diverter Valve
Three way diverter valve Function Spindle B The diverter valve A (Fig. 20) 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 20: Removal Of The Diverter Group And Its Internal Parts
Three way diverter valve Unscrew the screw L and remove the diverter group. Fig. 23 Removal of the diverter group and its Fig. 25 Rear view of the boiler internal parts Refer to the exploded view in Fig. 26 to remove Remove the front and both side case panels. -
Page 21: Electronic Control P.c.b
Electronic control p.c.b. The fundamental function of the Electronic control p.c.b. is that of controlling the boiler in relation to the ex- ternal 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 22: Operation Lights
Electronic control p.c.b. trol panel knobs operates the variable elements (5 and 6 in Fig. 28) 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). -
Page 23: Dip
Electronic control p.c.b. Minimum gas pressure adjustment Boiler in stand --- by condition. (function control in Gas conversion position). position). Ignition gas pressure adjustment Anti--- freeze system active. A short pulse every 4 seconds Reignition frequency Boiler ON condition (function control in (function control in ON (1) position) -
Page 24: Setting Jumpers
Electronic control p.c.b. Setting jumpers If the fuse has blown replace it with one that has the same characteristics after having identified the reason Two setting jumpers are fitted on the Electronic control for failure. p.c.b. Check the setting jumpers position Refer to Fig. - Page 25 Electronic control p.c.b. Attention p.c.b. towards the control panel fascia making sure of the contact between the boiler reset but- ton B and the tab C (Fig. 38). After installing the Electronic control p.c.b. : Make sure the c.h. ( ) and d.h.w. ( ) tempera- ture adjustment knobs can move freely for the complete range.
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Page 26: Thermal Control In The
Electronic control p.c.b. 9.11 Thermal control in the ” ” mode Switch in the function mode See functioning with the function Taking water from the domestic hot control in the mode water circuit? (sec. 9.12) Is primary circuit temperature higher than that selected? Request for heat from room thermostat? -
Page 27: Full Sequence Ignition Device
Full sequence ignition device With the burner firing, interrupt the gas supply. The Full sequence ignition device must carry out a complete ignition cycle and then stop. 10.1 Function By turning the boiler on and off by means of the function The Full sequence ignition device used on the boiler switch the device must not unlock and the burner must carries out the following fundamental functions:... -
Page 28: Ignition And Control Sequence
Full sequence ignition device 10.4 Ignition and control sequence supply from the electronic control circuit lock memorised? cancels lock Air pressure switch at rest? starts fan Air pressure switch at work? beginning of wait period presence of flame? Air pressure switch at work? starts ignition discharges opens gas valve... -
Page 29: Modulating Gas Valve
Modulating gas valve 11.1 Function The Modulating gas valve A in Fig. 43 controls the gas inflow to the boiler burner. Fig. 44 11.3 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 30: Checks
Modulating gas valve 11.4 Checks 11.6 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 31: Primary Circuit Flow Switch
Primary circuit flow switch 12.2 Checks Warning: isolate the boiler from the mains 12.1 Function electricity supply before removing any covering or component. The Primary circuit flow switch (A in Fig. 48) function is to detect water flowrate through the primary hydraulic Mechanical function circuit of the boiler. -
Page 32: Expansion Vessel And
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 33: Flow Switch, Filter And Flow Limiter
D.h.w. flow switch, filter and flow 14.2 Nomenclature and location of parts (Fig. 58) limiter Flow switch sensor 14.1 Function Plug Magnetic ring The d.h.w. flow switch A in Fig. 56 is a device that gener- Float ates an electrical signal when hot water is drawn. Spring Filter Body... -
Page 34: Flow Limiter
D.h.w. flow switch, filter and flow limiter Remove the flow switch sensor (see section Fit the ring on the spindle of the float in the way 14.4). that lights the lamp B. Remove the gas valve (see section 11.6). Isolate the boiler from the mains electricity supply and reassemble the parts following the removing Unscrew the plug 2 (Fig. -
Page 35: Temperature Probe
Temperature probe 15.2 Checks Temperature---resistance relationship 15.1 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 36: Removal
By---pass valve 16.2 Removal 16.1 Function Warning: isolate the boiler from the mains electricity supply before removing any The By---pass valve A in Fig. 65 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 37: Fan, Venturi Device And Air Pressure Switch
Fan, venturi device and sure switch. Refer to the Fig. 68a or b in accordance with the Air pressure switch type of air pressure switch used. 17.1 Function Between COM or 3 and N.O. or 2 the contact must be open. -
Page 38: Removal Of 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. 72. Fig. 72 Warning: After cleaning or replacement as detailed above refer to section Combustion analysis check in the chapter Maintenance of the installation instructions manual. -
Page 39: Removal Of The Air Pressure Switch
Fan and Air pressure switch Unscrew the screws which hold the Air pressure switch to the frame. 17.5 Removal of the Air pressure switch Assemble the Air pressure switch carrying out the removal operations in reverse sequence. Warning: isolate the boiler from the mains electricity supply before removing any Warning: to correctly connect the Air pressure covering or component. -
Page 40: Ignition And Detection Electrodes
Ignition and detection electrodes Check the integrity of the detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner. 18.1 Function Check the connection wires. Three electrodes are fitted on the burner. Two of them are the ignition electrodes and are fitted near the front Warning: isolate the boiler from the mains part of the burner. -
Page 41: Safety Thermostat
Safety thermostat contact must be closed (electrical resistance zero 19.1 Function 19.3 Removal The safety thermostat A in Fig. 77 is a device that senses the temperature of the primary circuit water Warning: isolate the boiler from the mains which flows in the outlet pipe of the primary heat ex- electricity supply before removing any changer. -
Page 42: Short Spare Parts List
Short spare parts list Key G.C. part no. Description Q.ty Manufac- Manufacturer’s reference turer part no. 173---148 Burner (mod. M90D.24S, M90D.24SR) KI1004 102 Polidoro Polidoro 173---149 Burner (mod. M90D.28S, M90D.28SR) KI1004 147 169---069 KI1064 505 Injectors for natural gas Polidoro (mod. - Page 43 Short spare parts list...
- Page 44 *1796209146* 17962.0914.6 3804 44A4 UK...
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