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Table of Contents
Related Manuals for Biasi M96.24SM/B
Summary of Contents for Biasi M96.24SM/B
- Page 1 Wall hung, fan flue, room sealed, high efficiency gas boiler Service manual GARDA HE Models: G.C. Appl. No. M96.24SM/B 47---970---25 M96.28SM/B 47---970---26 GARDA HE SILVER Models: G.C. Appl. No. M96.24SM/D 47---970---27 M96.28SM/D 47---970---28 Leave this manual adjacent to the gas meter...
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Page 2: Table Of Contents
Table of contents Modulating gas valve ....12.1 Function ......12.2 Nomenclature of the parts . -
Page 3: Overall Information
Overall information Overall View Air pressure Flue thermostat switch Condensing heat exchanger Expansion vessel Main heat exchanger Combustion Safety chamber thermostat Burner Ignition electrodes Detection Automatic electrode air release valve Diverter valve C.h. temp. D.h.w. probe heat exchanger Main circuit flow switch Condensate D.h.w. -
Page 4: 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 5: 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 6: Diagrams
Diagrams Wiring diagram Wiring diagram for boiler equiped with full sequence ignition device type: Bertelli & Partners FM30 External controls Electric supply Flue Safety Air pressure Ignition Flame detection terminal block terminal block thermostat thermostat switch electrodes electrode gnye gnye Condensate trap Electronic... - Page 7 Diagrams Wiring diagram for boiler equiped with full sequence ignition device type: Honeywell FPLD External controls Electric supply Flue Safety Air pressure Ignition Flame detection terminal block terminal block thermostat thermostat switch electrodes electrode gnye gnye Condensate trap Electronic control p.c.b. Full sequence ignition device gnye...
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Page 8: 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 9: 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 10 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 13: Primary Heat Exchanger
Primary heat exchanger Function 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. 9 Fig. 11 The hydraulic circuit is composed of 8 elliptical pipes Loosen the connection K and move the pipe L connected in parallel (Fig. -
Page 14: Condensing Heat Exchanger
Condensing heat exchanger Using pliers, remove the spring K moving it down- wards and disconnect the rubber pipe L. Function Remove the bracket M by unscrewing the screws that hold it on the frame. The return water flows through the condensing heat ex- changer A in Fig. - Page 15 D.h.w. heat exchanger Removal Warning: isolate the boiler from the mains Function electricity supply before removing any The d.h.w heat exchanger A in Fig. 14 and Fig. 16 al- covering or component. lows the instantaneous transfer of heat from the primary Remove the front and right hand side panels of hydraulic circuit to the water destined for d.h.w use.
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Page 16: 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. 18 and Fig. 19 has the function of making the water in the main circuit circulate through Remove the pump head by undoing the screws which hold it to the pump body and check that the impeller is... -
Page 17: Removal Of The Electric Actuator
Three way diverter valve Function Spindle B The diverter valve A (Fig. 21) 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 18: Removal Of The Diverter Group And Its Internal Parts
Three way diverter valve Unscrew the screw M and remove the diverter group. Fig. 24 Removal of the diverter group and its Fig. 26 Rear view of the boiler internal parts Refer to the exploded view in Fig. 27 to remove Remove the front and both side case panels. -
Page 19: 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 10.1 Function water for d.h.w. use) and operating in order to keep the temperature of the hydraulic circuits constant. -
Page 20: Operation Lights
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). If the power requested is higher, then the burner is switched ON at maximum power and will control by modulating to 40% of the maximum power output. -
Page 21: Dip
Electronic control p.c.b. Minimum gas pressure adjustment Boiler in stand --- by condition. (function control in Gas conversion position). Ignition gas pressure adjustment Anti--- freeze system active. A short pulse every 4 seconds Reignition frequency Boiler ON condition (function control in ON (1) position) 1 second ON 1 second OFF... -
Page 22: Settings
Electronic control p.c.b. 10.6 Settings 10.8 Checks Check that the fuse is complete Two setting jumpers are fitted on the Electronic control p.c.b. If the Electronic control p.c.b. does not supply any de- vice (pump, fan, etc.) check that the fuse 12 (Fig. 29) is Refer to Fig. - Page 23 Electronic control p.c.b. Attention Insert the spindles in the control panel knobs un- till the notch A (Fig. 39) reaches the potentio- After installing the Electronic control p.c.b. : meter edge. It is not necessary to force them in the knob. Make sure the c.h.
- Page 24 Electronic control p.c.b. 10.10 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. 10.11) Is primary circuit temperature higher than that selected? Request for heat from room thermostat?
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Page 25: 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. 11.1 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 26: Ignition And Control Sequence
Full sequence ignition device 11.4 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 27: Modulating Gas Valve
Modulating gas valve 12.1 Function The Modulating gas valve A in Fig. 44 controls the gas inflow to the boiler burner. Fig. 45 12.3 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 28: Checks
Modulating gas valve 12.4 Checks 12.6 Removal of the gas valve Warning: isolate the boiler from the mains electricity supply before removing Warning: isolate the boiler from the mains covering or component. electricity supply before removing covering or component. Check the modulation operator coil Remove the front panel of the case. -
Page 29: Primary Circuit Flow Switch
Primary circuit flow switch 13.1 Function The Primary circuit flow switch (A in Fig. 49) function is Boiler OFF Boiler ON to detect water flowrate through the primary hydraulic Fig. 50 circuit of the boiler. Electrical check It is possible to verify the general operation of the switch by measuring the electric resistance between the con- tacts C. -
Page 30: 14 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 31: H.w. Flow Switch, Filter And Flow Limiter
D.h.w. flow switch, filter and flow 15.2 Nomenclature and location of parts (Fig. 59) limiter Flow switch sensor 15.1 Function Plug Magnetic ring The d.h.w. flow switch A in Fig. 57 is a device that gener- Float ates an electrical signal when hot water is drawn. Spring Filter Body... -
Page 32: 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 15.4). that lights the lamp B. Remove the gas valve (see section 12.6). Isolate the boiler from the mains electricity supply and reassemble the parts following the removing Unscrew the plug 2 (Fig. -
Page 33: 16 Temperature Probe
Temperature probe 16.2 Checks Temperature---resistance relationship 16.1 Function The Temperature probe has the function of converting Warning: isolate the boiler from the mains the temperature of the water in the hydraulic circuit electricity supply before removing any where it is installed into an electrical signal (resistance). covering or component. - Page 34 By---pass valve 17.2 Removal 17.1 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.
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Page 35: Fan, Venturi Device And Air Pressure Switch
Fan, venturi device and Air pressure switch 18.1 Function The function of the Fan A (Fig. 67 and Fig. 68) is to force the products of combustion trough 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 36 Fan and Air pressure switch 18.3 Removal of the Fan Warning: isolate the boiler from the mains electricity supply before removing any N.O. covering or component. ”L ” connection Remove all the case panels, the sealed chamber lid and the combustion chamber lid. N.C.
- Page 37 Fan and Air pressure switch 18.4 Inspection and removal of the venturi 18.5 Removal of the Air pressure switch device Warning: isolate the boiler from the mains Warning: isolate the boiler from the mains electricity supply before removing any electricity supply before removing any covering or component.
- Page 38 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. 19.1 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 39 Safety thermostat contact must be closed (electrical resistance zero 20.1 Function 20.3 Removal The safety thermostat A in Fig. 77 and Fig. 78 is a de- vice that senses the temperature of the primary circuit Warning: isolate the boiler from the mains water which flows in the outlet pipe of the primary heat electricity supply before removing any exchanger.
- Page 40 Flue thermostat 21.1 Function The Flue thermostat A in Fig. 80 and Fig. 81 senses the temperature of the combustion products that flow through the condensing heat exchanger. Fig. 81 21.2 Checks Overheat temperature value Set the temperature control knobs to their max. position and run the boiler in d.h.w.
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Page 41: Condensate Trap
Condensate trap 22.1 Function The condensate trap A in Fig. 83 and Fig. 85 allows the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combus- tion products. A plastic ball closes the trap outlet in case that the trap is empty. -
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. M96.24SM/...,) KI1004 102 Polidoro Polidoro 173---149 Burner (mod. M96.28SM/...,) KI1004 147 169---069 169---069 KI1064 505 KI1064 505 Injectors for natural gas (mod. M96.24SM/..., ) Polidoro Injectors for natural gas (mod. - Page 43 Short spare parts list...
- Page 44 *1796210720* 17962.1072.0 2404 44A4 UK 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...