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Wall hung, fan flue, room sealed gas boiler
SERVICE MANUAL
GARDA
Models:
M90F.24S
M90F.28S
M90F.32S
M90F.24SR
M90F.28SR
Leave this manual adjacent to the gas meter
G.C. Appl. No.
47--970--19
47--970--20
47--970--22
41--970--10
41--970--11
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 GARDA M90F.24S
- Page 1 M90F.24SR 41--970--10 M90F.28SR 41--970--11 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...
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Page 3: Table Of Contents
Table of contents 10.2 Checks ......10.3 Removal ......10.4 Ignition and control sequence . -
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 M90F.24S M90F.28S M90F.32S Wiring diagram for boiler equiped with full sequence ignition device type: ceza Air pressure Safety Flame detection ignition Electrical switch electrode electrodes thermostat supply terminal block g/v c gr n Modulating gas valve r c n DHW temperature DHW flow CH temperature... -
Page 8: Wiring Diagram M90F.24Sr, M90F.28Sr
Diagrams Wiring diagram M90F.24SR, M90F.28SR Wiring diagram for boiler equiped with full sequence ignition device type: ceza Air pressure Flame detection ignition Safety Electrical switch thermostat electrode electrodes supply terminal block g/v c gr n Modulating gas valve CH temperature Primary probe NTC pressure switch... -
Page 9: 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 12: 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 13: 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 14: Removal
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 15: Three Way Diverter Valve
Three way diverter valve Function Spindle B not visible The diverter valve A (Fig. 20) has the function of modify- 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 16: 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 17: Function
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 18: Checking The Temperature
Electronic starting control p.c.b. D.h.w. temperature adjustment When the boiler functions in d.h.w. (Fig. 30), the signal coming from the d.h.w. temperature probe is compared Dip---switch selectors with the signal given by the control panel through the Operation lamps adjustment made by the user (knob Ignition gas pressure adjustment (ACC.) Maximum c.h. -
Page 19: Ignition Gas Pressure Adjustment
Electronic starting control p.c.b. Boiler in stand --- by condition. Normally operating boiler (function control in (see the previous table for details) position) position). Anti--- freeze system active. C.h. operation A short pulse every 4 seconds Boiler ON condition D.h.w. operation (function control in position) position) -
Page 20: Checks
Electronic starting control p.c.b. After any adjustment operation the selector has to be brought back to the normal position (ON). Selector 2 1 2 3 4 5 6 7 8 9 This selects the boiler functions on the basis of the type Fig. - Page 21 Electronic starting control p.c.b. To disconnect the connectors J1, J3, J7, J15, J16 While tightening the screws that fix the Electronic and (5, 1, 8, 14 and 6 in Fig. 28) delicately flex starting control p.c.b. on the control panel, keep the hook present on one side of each socket.
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Page 22: Thermal Control In The
Electronic starting control p.c.b. 9.11 Thermal control in the ” ” mode See functioning with the function Taking Is primary circuit water from the domestic hot control in the mode temperature higher than that water circuit? selected? (sec. 9.12) Circulator off Starts the circulator Operates motorised valve Request for heat from... -
Page 23: Thermal Control In The
Electronic starting control p.c.b. 9.12 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 24: Function
Modulating gas valve 10.1 Function The Modulating gas valve A in Fig. 41 controls the gas inflow to the boiler burner. Fig. 42 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 25: Checks
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 covering or component. electricity supply before removing covering or component. Check the modulation operator coil Remove the front panel of the case. -
Page 26: Primary Circuit Flow Switch
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. 46) function is to detect water flowrate through the primary hydraulic Mechanical function circuit of the boiler. -
Page 27: Expansion Vessel And
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 28: H.w. Flow Switch, Filter And Flow Limiter
D.h.w. flow switch, filter and flow limiter 13.2 Nomenclature and location of parts (Fig. 56) 13.1 Function Flow switch sensor The d.h.w. flow switch A in Fig. 54 is a device that gener- Body ates an electrical signal when hot water is drawn. O---ring Spring Magnetic ring... -
Page 29: Removal Of The Flow Switch Group
D.h.w. flow switch, filter and flow limiter 13.5 Removal of the flow switch group and If on the M90F.28S model the flow rate of the d.h.w. cir- cuit is too high, it is possible to limit it by installing a flow d.h.w. -
Page 30: 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 31: Function
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. 61 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 32: Checks
Ignition and detection electrodes 16.2 Checks Check the position of the electrode edges 16.1 Function Warning: isolate the boiler from the mains Three electrodes are fitted near the front part of the electricity supply before removing any burner. The ignition sparks take place between the me- covering or component. - Page 33 Ignition and detection electrodes Extract the electrodes from the burner. Assemble the electrodes carrying out the removal operation in reverse order. Refer to Fig. 63 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.
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Page 34: Safety Thermostat
Safety thermostat contact must be closed (electrical resistance zero Ω). 17.1 Function 17.3 Removal The safety thermostat A in Fig. 67 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 35: 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. M90F.24S, M90F.24SR) KI1004 102 Polidoro 173---149 Burner (mod. M90F.28S, M90F.28SR) KI1004 147 Burner (mod. M90F.32S) BI1193 100 169---069 Injectors for natural gas KI1064 505 Polidoro (mod. - Page 36 Short spare parts list E83---122 Detection electrode BI1123 102 (mod. M90F.28S, M90F.28SR) Detection electrode (mod. M90F.32S) BI1193 104 E83---145 Temperature ---pressure gauge BI1475 108 IMIT...
- Page 37 *1796209187* 17962.0918.7 4006 44A4 UK...
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