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Related Manuals for Biasi M96.24SM/B2
Summary of Contents for Biasi M96.24SM/B2
- Page 1 Wall hung, fan flue, room sealed, high efficiency gas boiler Service manual GARDA HE Models: G.C. Appl. No. M96.24SM/B2 47---583---03A M96.28SM/B2 47---583---04A GARDA HE SILVER Models: G.C. Appl. No. M96.24SM/D2 47---583---03B M96.28SM/D2 47---583---04B Leave this manual adjacent to the gas meter...
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Page 2: Table Of Contents
Table of contents Modulating gas valve ....11.1 Function ......11.2 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 Electric supply External controls Three way Pump Ignition Primary circuit Air pressure Flame detection terminal block terminal block diverter valve electrodes flow switch switch electrode Condensate trap Remote control D.h.w. flow C.h. temperature Safety Flue D.h.w. temperature Time switch Modulating terminal block... -
Page 7: Functional Flow Diagrams
Diagrams Functional flow diagrams General layout Electronic control p.c.b. (low voltage section) J1--- 1 Fuse 3,15 A 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 8: Circuit Voltages
Diagrams Circuit voltages during c.h. or d.h.w. operation only during c.h. operation Electrical voltages with burner on only during d.h.w. operation Pump 3 way diverter valve Modulating Gas valve Supply network Safety switch thermostat pressure... -
Page 11: 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 12: Condensing Heat Exchanger
Condensing heat exchanger Remove the clip I and move the pipe J down- wards freeing it from the connection, then turn it towards right. Function Using pliers, remove the spring K moving it down- The return water flows through the condensing heat ex- wards and disconnect the rubber pipe L. -
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 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. -
Page 14: 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. 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 the main heat exchanger, the condensing heat ex-... -
Page 15: Three Way Diverter Valve
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 16: 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 internal parts Fig. 26 Rear view of the boiler Refer to the exploded view in Fig. 27 to remove Remove the front and both side case panels. -
Page 17: Electronic Control/Ignition P.c.b
Electronic control/ignition p.c.b. The fundamental function of the Electronic control/igni- tion p.c.b. is that of controlling the boiler in relation to the external needs (i.e. heating the dwelling or heating 10.1 Function the 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 control/ignition p.c.b. Some of these devices are directly accessible by the user (function control, temperature adjustment poten- tiometers etc.) others are accessible by removing the service panel or the control panel lid. Fig. 29 x1 connector x6 connector x7 connector x4 connector x2 connector Lock ---out signal lamp... -
Page 19: Operation Lights
Electronic control/ignition p.c.b. With the boiler switched ON ( ) all the lamps (10 in Fig. 29) are activated. The following table gives the relationship between each of the possible lamp combinations and their meaning. Normally operating boiler (see the previous table for details) C.h. -
Page 20: Reignition Frequency Setting
Electronic control/ignition p.c.b. 10.6 Reignition frequency setting Remove the front panel of the case. Open the gas valve outlet pressure test point (7, It is possible to select the minimum time that must pass see section 11.2) and connect the gauge. between two ignitions of the burner in c.h. -
Page 21: Checks
Electronic control/ignition p.c.b. Press the reset button C repeatedly (4 times) until When replacing the Electronic control/ignition the lamps E give the indication as in Fig. 40 (igni- p.c.b. it is advisable to go through the setting modes tion pressure adjustment mode). of the boiler Gain access to the parts located inside the con- trol panel as explained in the section 2.3 of this... - Page 22 Electronic control/ignition p.c.b. After installing the Electronic control/ignition p.c.b. : Make sure the c.h. ( ) and d.h.w. ( ) tem- perature adjustment knobs can move freely for the complete range. If not, remove the spindle again as described at step 3, turn the knob half a turn and re---insert the spindle.
- Page 23 Electronic control/ignition p.c.b. 10.10 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. 10.11) Is primary circuit temperature higher than that selected? Request for heat from room thermostat?
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Page 24: Ignition And Control Sequence
Electronic control/ignition p.c.b. 10.12 Ignition and control sequence Ignition request 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 beginning of ignition period flame presence? -
Page 25: Modulating Gas Valve
Modulating gas valve 11.1 Function The Modulating gas valve A in Fig. 46 controls the gas inflow to the boiler burner. Fig. 46 Fig. 47 By means of an electric command given to the on---off operators the passage of the gas through the Modula- 11.3 Adjustment ting gas valve can be opened or closed. -
Page 26: Checks
Modulating gas valve Measure the electrical resistance between the connector pins of the on---off operators as illus- trated in Fig. 49. On---off operator approx. 4 180 Ω* * at ambient temperature. Fig. 49 11.5 Removal of the gas valve Warning: isolate the boiler from the mains Fig. -
Page 27: Primary Circuit Flow Switch
Primary circuit flow switch 12.1 Function The Primary circuit flow switch (A in Fig. 51) function is Boiler OFF Boiler ON to detect water flowrate through the primary hydraulic Fig. 52 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 28: 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 29: Flow Switch, Filter And Flow Limiter
D.h.w. flow switch, filter and flow 14.2 Nomenclature and location of parts (Fig. 61) limiter Flow switch sensor 14.1 Function Body The d.h.w. flow switch A in Fig. 59 is a device that gener- O---ring ates an electrical signal when hot water is drawn. Spring Magnetic ring Float... -
Page 30: Flow Limiter
D.h.w. flow switch, filter and flow limiter 14.5 Removal of the flow switch group and min. flow limiter. d.h.w. circuit filter If on the M96.28SM/... and M96.32SM/... model the flow rate of the d.h.w. circuit is too high, it is possible to limit Warning: isolate the boiler from the mains it by installing a flow limiter. -
Page 31: Temperature Probe
Temperature probe 15.2 Checks Temperature---resistance relationship 15.1 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 32: 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 33: Fan, Venturi Device And Air Pressure Switch
Fan, venturi device and Air pressure switch 17.1 Function The function of the Fan A (Fig. 67 and Fig. 68) 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 34: Removal Of The Fan
Fan and Air pressure switch Remove the caps of the pressure test points lo- cated on the top of the boiler and connect a differ- ential pressure gauge (Fig. 70). Switch on the boiler. Fig. 71 Remove the Fan by sliding it towards left (se the arrow in Fig. -
Page 35: Removal Of The Air Pressure Switch
Fan and Air pressure switch 17.5 Inspect the venturi device B and the connection Removal of the Air pressure switch pipe I. Ensure they are clean. Warning: isolate the boiler from the mains Re---assemble the parts in reverse order of re- electricity supply before removing any moval. -
Page 36: 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 37: Safety Thermostat
Safety thermostat contact must be closed (electrical resistance zero Ω). 19.1 Function 19.3 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 38: Checks
Flue temperature probe NTC 20.1 Function The Flue temperature probe NTC A in Fig. 80 and Fig. 81 senses the temperature of the combustion products that flow through the condensing heat ex- changer. Fig. 81 20.2 Checks Overheat temperature value Set the temperature control knobs to their max. -
Page 39: Condensate Trap
Condensate trap 21.1 Function The condensate trap A in Fig. 82 and Fig. 84 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 40: 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 173---149 Burner (mod. M96.28SM/..., M96.32SM/...) KI1004 147 169---069 Injectors for natural gas (mod. M96.24SM/..., ) KI1064 505 Polidoro Injectors for natural gas (mod. - Page 41 Short spare parts list...
- Page 44 *1796212314* 17962.1231.4 0907 44A4 UK 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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