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Summary of Contents for Biasi M96A.24SM/B
- Page 1 Wall hung, fan flue, room sealed, high efficiency gas boiler Service manual GARDA HE MK2 Models: G.C. Appl. No. M96A.24SM/B 47---583---15 Combi boiler M96A.28SM/B 47---583---16 Combi boiler 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 Flue temperature Air pressure sensor probe NTC Condensing heat exchanger Expansion vessel Main heat exchanger Safety thermostat Combustion chamber C.h. temp. probe Burner Ignition electrodes Detection Automatic electrode air release valve Primary circuit pressure switch D.h.w. heat exchanger Diverter valve Condensate... -
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 Flame detection terminal block terminal block diverter valve electrodes electrode Air pressure sensor Primary circuit pressure switch rd bk wh gnye bu bn gnye gnye bu *bk *bn *bu bk bu wh rd bk bn bu... -
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 Supply network 3 way diverter valve Modulating Gas valve pressure Safety thermostat sensor... -
Page 11: Primary Heat Exchanger
Primary heat exchanger Remove the clip I and the safety thermostat J and the c.h. temperature probe K. It is not necessary to disconnect it from the wiring. Function 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. - Page 12 Primary heat exchanger In any case, avoid any actions that can damage the pro- tective varnish with which the exchanger has been cov- ered. Warning: After cleaning or replacement as detailed above, if it deemed necessary to undertake a combustion analysis, refer to the appropriate chapter Maintenance of the installation instructions manual.
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Page 13: Condensing Heat Exchanger
Condensing heat exchanger Function The return water flows through the condensing heat ex- changer A in Fig. 1 and Fig. 2. By reducing the combustion products temperature, the latent heat of the vapour is transferred to the water cir- cuit, allowing an extra gain of useful heat. The condensed vapour is then drained through the condensate trap B and the draining pipe C. - Page 14 Condensing heat exchanger In any case, avoid any actions that can damage the pro- Reassemble the exchanger carrying out the re- tective varnish with which the lid has been covered. moval operations in reverse order. Warning: to lubricate the O-- ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities.
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Page 15: H.w. Heat Exchanger
D.h.w. heat exchanger Remove the clip C and remove the primary circuit pressure switch D by lifting it upwards. It is not necessary to disconnect it from the wiring. Function Remove the clip E and remove the electric actua- The d.h.w heat exchanger A in Fig. 1 and Fig. 4 allows tor F by pulling it. -
Page 16: Pump
Pump Remove the air release plug from the pump. Start the boiler and with a screwdriver, turn the rotor in the direc- tion of the arrow. If there is a defect in starting, the rotor Function will begin to turn normally only starting it manually. The pump A in Fig. - Page 17 Pump Remove the locking plate F (Fig. 3). Unscrew the two screws G that hold the pump on the frame and remove the pump. Warning: to lubricate the O-- ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities.
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Page 18: Three Way Diverter Valve
Three way diverter valve Function Spindle B visible The diverter valve A (Fig. 1) 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 19: Removal Of The Tree Way Diverter Valve
Three way diverter valve Removal of the diverter group Remove the front and both side case panels. Empty the primary circuit and the d.h.w circuit of the boiler. Remove the electric actuator (see section 9.3). Remove the fixing spring H (Fig. 6) and remove the primary circuit pressure switch I. -
Page 20: 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 21: Checking The Temperature
Electronic control/ignition p.c.b. tiometers etc.) others are accessible by removing the If the power requested is lower than 40% of the maxi- service panel or the control panel lid. mum power output then control is achieved by switch- ing ON the burner at minimum power, then switching OFF (ON/OFF function). -
Page 22: Operation Lights
Electronic control/ignition p.c.b. Boiler in stand --- by condition. (function control in position). Anti--- freeze system active. A short pulse every 4 seconds Boiler ON condition (function control in position) 1 second ON 1 second OFF With the boiler switched ON ( ) all the lamps (12 in Fig. -
Page 23: Setting The Boiler Control Function Modes
Electronic control/ignition p.c.b. 10.5 Setting the boiler control function modes Where: Lamp OFF It is possible to select the various boiler control function modes by using the function selector knob A and the Lamp ON D.h.w. temperature control knob B (Fig. 5). Fig. -
Page 24: Reignition Frequency Setting
Electronic control/ignition p.c.b. the setting has changed and must be memo- To reset the boiler to the normal operation turn it rised. OFF and ON by the function selector knob A. In any case, the boiler automatically resets to its nor- To memorize the setting keep pressed the reset mal operation after 10 minutes. -
Page 25: Setting The Tree Way Diverter Valve
Electronic control/ignition p.c.b. Press the reset button D repeatedly (3 times) until the lamps F give the indication as in Fig. 21 (set- ting the tree way diverter valve mode operation). Where: Lamp OFF Lamp ON Fig. 18 Fig. 21 Keep pressed the reset button D for about 10 sec- At this step it is possible to visualize the current setting onds until the lock ---out signal lamp E blinks. -
Page 26: Removal Of The Electronic Control P.c.b
Electronic control/ignition p.c.b. By turning the boiler on and off by means of the function Important switch the device must not unlock and the burner must When re---assembling the Electronic control/ignition not turn on. p.c.b.: Fan functioning device Fit the p.c.b. into the control panel by first insert- With the boiler operating and the burner on, open the ing the front lower edge under the control knob positive pressure test point of the Fan pressure connec-... - Page 27 Electronic control/ignition p.c.b. 10.12 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. 10.13) Is primary circuit temperature higher than that selected? Request for heat from room thermostat?
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Page 28: Ignition And Control Sequence
Electronic control/ignition p.c.b. 10.14 Ignition and control sequence Ignition request lock memorised? cancels lock Air pressure sensor at rest? starts fan Air pressure sensor at work? beginning of wait period presence of flame? Air pressure sensor at work? starts ignition discharges opens gas valve beginning of ignition period flame presence? -
Page 29: Modulating Gas Valve
Modulating gas valve 11.1 Function The Modulating gas valve A in Fig. 1 controls the gas inflow to the boiler burner. Fig. 2 11.3 Adjustment For the pressure values refer to the Technical data section of the User manual and Installation instruc- tions Fig. -
Page 30: Checks
Modulating gas valve Remove the protection cap B (Fig. 3) from the Remove the front panel of the case. mechanical pressure adjustment components Disconnect the connector E (Fig. 5). levering with a flat screwdriver in the slots C. Unscrew the screw F and remove on---off oper- Start the boiler at its maximum power. -
Page 31: Primary Circuit Pressure Switch
Primary circuit pressure switch N.O. 12.1 Function The Primary circuit pressure switch (A in Fig. 1) function is to check the presence of water in the primary hy- draulic circuit and that the pressure is above the mini- mun. Fig. 2 12.3 Removal Warning: isolate the boiler from the mains... -
Page 32: Removal Of The Expansion Vessel
Primary circuit pressure switch Remove the protective cap E (Fig. 4) from the valve on the top of the expansion vessel and con- nect a suitable air pressure gauge. Fig. 5 Re---assemble the parts in reverse order of re- moval. 13.4 Removal of the temperature---pressure gauge... -
Page 33: H.w. Flow Switch, Filter And Flow Limiter
D.h.w. flow switch, filter and flow Body Float limiter Filter 14.1 Function Sensor holder spring Sensor The d.h.w. flow switch A in Fig. 1 is a device that gener- ates an electrical signal when hot water is drawn. Fig. 3 14.3 Checks Warning: isolate the boiler from the mains... -
Page 34: Flow Limiter
D.h.w. flow switch, filter and flow limiter Reassemble the parts following the removing se- Remove the flow switch group as explained in the quence in reverse order. section 14.5. Separate the flow switch plug 1 from the body 4 14.6 Flow limiter (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 Temperature probe Reassemble the d.h.w. Temperature probe carry- ing out the removal operations in reverse order. Warning: to lubricate the O-- ring gaskets exclusively use a silicone base grease compatible to be in contact with foods and approved by the local water Authorities.
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Page 37: 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. 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 38: Fan And Air Pressure Sensor
Fan and Air pressure sensor 17.1 Function The function of the Fan A (Fig. 1 and Fig. 2) 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 39: Removal Of The Fan
Fan and Air pressure sensor The ignition is not allowed and appropriate fault Warning: After cleaning or replacement as indication is given (see section 10.4) detailed above, if it deemed necessary to undertake a combustion analysis, refer to 17.3 the appropriate chapter Maintenance of the Removal of the Fan installation instructions manual. -
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 a temperature below that of the safety thermostat and no overheat intervention should occur. 19.1 Function Warning: isolate the boiler from the mains electricity supply before removing any The safety thermostat A in Fig. 1 and Fig. 2 is a device covering or component. -
Page 42: Flue Temperature Probe Ntc
Flue temperature probe NTC In the case that the temperature of the combustion products reaches a potentially dangerous value, it stops the boiler operation. It is therefore allowed the 20.1 Function use of plastic materials for the flue outlet pipes and The Flue temperature probe NTC A in Fig. - Page 43 Flue temperature probe NTC Assemble the Flue temperature probe NTC carry- ing out the removal operations in reverse se- quence.
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Page 44: Condensate Trap
Condensate trap When the condensate reaches the lower part of the ex- changer obstructs the the exhaust gas flow and the boiler stops (no signal from the air pressure sensor). 21.1 Function 21.2 Removal The condensate trap A in Fig. 4 and Fig. 5 allows the discharge of the condensate via the condensate drain Warning: isolate the boiler from the mains pipe avoiding in the mean time the escape of combus-... -
Page 46: Short Spare Parts List
Short spare parts list Key G.C. part no. Description Q.ty Manufac- Manufacturer’s reference turer part no. Polidoro 173---148 Burner (mod. M96A.24SM/...) KI1004 102 173---149 Burner (mod. M96A.28SM/...) KI1004 147 169---069 Injectors for natural gas (mod. M96A.24SM/...) KI1064 505 Polidoro Injectors for natural gas (mod. M96A.28SM/...) 169---070 KI1064 506 Injectors for LPG (mod. - Page 47 Short spare parts list...
- Page 48 *1796215791* 17962.1579.1 4508 48A4 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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