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Wall hung, fanflue, roomsealed, high efficiency gas boiler
Service manual
BASICA COND
Product name
BASICA COND 24C
BASICA COND 28C
BASICA COND 32C
Leave this manual adjacent to the gas meter
Warning:
Service / repairs must be carried out, only by a qualified Gas Safe Registered
Engineer, who will be responsible for the current Regulations for gas
appliances.
Note:
After servicing, complete the relevant Service Interval Record section of the
Benchmark Checklist of the user and installation manual.
Models
M275V.2024 SM
M275V.2428 SM
M275V.2832 SM
G.C. Appl. No.
47-583-49
47-583-50
47-583-51
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Summary of Contents for Biasi M275V.2024 SM
- Page 1 Wall hung, fanflue, roomsealed, high efficiency gas boiler Service manual BASICA COND Product name Models G.C. Appl. No. BASICA COND 24C M275V.2024 SM 47-583-49 BASICA COND 28C M275V.2428 SM 47-583-50 BASICA COND 32C M275V.2832 SM 47-583-51 Leave this manual adjacent to the gas meter...
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Page 3: Table Of Contents
TABLE OF CONTENTS 1 OVERALL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . .4 12 PRIMARY CIRCUIT PRESSURE SWITCH . -
Page 4: Overall Information
OVERALL INFORMATION OVERALL INFORMATION 1 .1 Overall View Flue temperature probe NTC and Safety thermal fuse Condensing heat exchanger Burner Ighition/Detection Expansion electrode vessel NTC heating delivery probe - NTC maximum temperature Air/gas mixer Condensate trap Main circuit C.H. pressure pressure switch relief valve Electric actuator... -
Page 5: General Access And Emptying Hydraulic
GENERAL ACCESS AND EMPTYING HYDRAULIC CIRCUITS GENERAL ACCESS AND EMPTYING Pull the lower part of the front panel and lift it upwards (Figure HYDRAULIC CIRCUITS 2.3). 2 .1 Nomenclature Figure 2 .3 To remove the side panels loosen the screws "7" (Figure 2.2) and "8"... -
Page 6: Main Electronic P.c.b. Box
GENERAL ACCESS AND EMPTYING HYDRAULIC CIRCUITS 2 .4 Main electronic p .c .b . box Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent . Terminal block lid removal To gain access to the parts located inside the control panel pro- ceed as follows: 1 Remove the front panel of the case. -
Page 7: Emptying The Primary Circuit
GENERAL ACCESS AND EMPTYING HYDRAULIC CIRCUITS 2 .5 Emptying the primary circuit 2 .6 Emptying the D .H .W . circuit 1 Close the C.H. circuit flow and return cocks "18" (Figure 2.10). 1 Close the D.H.W. inlet cock "19" (Figure 2.10). 2 Open one or more hot water taps until the boiler has been completely emptied. -
Page 8: Diagrams
DIAGRAMS DIAGRAMS 3 .1 Wiring diagram M275V SM Ignition Electric supply Gas valve Flame detection electrode Pump Remote control Room thermostat cable gnye gnye gnye Primary circuit pressure switch bn = brown bu = blue bk = black wh = white rd = red gy = grey gn = green... -
Page 9: Circuit Voltages
DIAGRAMS 3 .2 Circuit voltages during c.h. or d.h.w. operation Electrical voltages or frequency only during c.h. operation only with burner on during d.h.w. operation Pump Supply network Gas valve D.h.w. Flow switch Main circuit Safety thermostat pressure switch Figure 3 .2 - 9 -... -
Page 10: Fault Finding
FAULT FINDING FAULT FINDING - 10 -... - Page 11 FAULT FINDING - 11 -...
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Page 12: Display Diagnostic
FAULT FINDING 4 .1 Display diagnostic The display indications provide help in the diagnosis of fault find- ing. The control panel display gives other information for the user. The following table gives fault code, error and the reson for the fault. E01 + Safety lockout due to failed ignition. E02 + Lockout due to safety thermostat. - Page 13 FAULT FINDING RESET Figure 4 .5 3 Press the "E" key to set "1 - -", e sucthen press "A" to confirm the 1 and go to the next segment. 4 Press the "E" key to set "1 9 -", then press "A" to confirm the 9 and go to the next segment. 5 Press the "E"...
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Page 14: Condensing Heat Exchanger
CONDENSING HEAT EXCHANGER CONDENSING HEAT EXCHANGER 5 .1 Function The Condensing heat exchanger "1" in Figure 5.1 has the func- tion of transferring heat produced from combustion of the gas and from the flue exhausted gas to the water circulating in it. Figure 5 .1 By reducing the combustion products temperature, the latent heat of the vapour is transferred to the water circuit, allowing an extra gain of useful heat. -
Page 15: Cleaning
CONDENSING HEAT EXCHANGER Ensure to tighten the nuts "6" - Figure 5.2 firmly. 5 .3 Cleaning If there are deposits of dirt on the coil of the Condensing heat exchanger, clean with a bristle paintbrush and remove the dust with a hoover. Warning: After cleaning or replacement as detailed above, it is deemed necessary to undertake a com- bustion analysis as detailed in chapter "11 .3 Adjust-... -
Page 16: H .W . Heat Exchanger
D.H.W. HEAT EXCHANGER D .H .W . HEAT EXCHANGER 6 .1 Function The D.H.W. heat exchanger "1" in Figure 6.1 and Figure 6.3 al- lows the instantaneous transfer of heat from the primary hydrau- lic circuit to the water destined for D.H.W. use. Figure 6 .3 6 Move the exchanger towards the rear of the boiler and extract it to the left. -
Page 17: Pump
PUMP PUMP 7 .2 Removal pump head 7 .1 Function Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- The pump "1" in Figure 7.1 and Figure 7.2 has the function of nent . making the water in the main circuit circulate through the main condensing heat exchanger and therefore through the C.H. -
Page 18: Three Way Diverter Valve
THREE WAY DIVERTER VALVE THREE WAY DIVERTER VALVE 8 .3 Removal of the electric actuator Warning: isolate the boiler from the mains electrici- 8 .1 Function ty supply before removing any covering or compo- nent . The diverter valve "1" (Figure 8.1) has the function of modifying the hydraulic circuit of the boiler by means of an electric com- 1 Remove the front case panel. -
Page 19: Removal Of The Diverter Group
THREE WAY DIVERTER VALVE Warning: to lubricate the O-ring gaskets exclusively use a silicone base grease compatible to be in con- tact with foods and approved by the local water Au- thorities . 8 .5 Removal of the diverter group 1 Remove the front and both side case panels. -
Page 20: Main Electronic Control/Ignition P.c.b
MAIN ELECTRONIC CONTROL/IGNITION P.C.B. MAIN ELECTRONIC CONTROL/IGNITION The fundamental function of the Main electronic control/ignition P .C .B . p.c.b. is that of controlling the boiler in relation to the external needs (i.e. heating the dwelling or heating the water for D.H.W. use) and operating in order to keep the temperature of the hy- 9 .1 Function draulic circuits constant. -
Page 21: Selection And Adjustment Devices
MAIN ELECTRONIC CONTROL/IGNITION P.C.B. 9 .2 Selection and adjustment devices 9 .3 Checking the temperature On the Main electronic control/ignition p.c.b. several selection, The Main electronic control/ignition p.c.b. makes it possible to adjustment and protection devices are located. (Figure 9.2). separately adjust the C.H. water flow temperature and D.H.W. -
Page 22: Setting The Boiler Control Function Modes
1 To enter in the parameters setting mode press at the same the value of parameter P10 (Figure 9.9). time the 2 keys "F" and "G" (Figure 9.5) and hold in for 5 sec- 03 = M275V.2024 SM ond until the display shows Figure 9.6. 04 = M275V.2428 SM 05 = M275V.2832 SM... - Page 23 MAIN ELECTRONIC CONTROL/IGNITION P.C.B. 5 Press "A" or "B" (Figure 9.5) to confirm the value entered and return to the list of parameters (Figure 9.8). RESET 6 Press "A" or "B" until the LCD display shows the code P02, indicating entry into “parameter P02” (Figure 9.10). Figure 9 .15 RESET 13 Press "A" or "B" (Figure 9.5) to confirm the value entered and return to the list of parameters (Figure 9.14).
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Page 24: Checks
MAIN ELECTRONIC CONTROL/IGNITION P.C.B. Start the boiler until the burner is ignited. With the burner firing, interrupt the gas supply. The Main elec- tronic control/ignition p.c.b. must carry out four complete ignition RESET cycles and then, after about 4 minutes, goes to lock-out state. Switch off and on the electricity supply to the boiler, by means of the fused spur isolation switch, the device must not unlock and the burner must not turn on. - Page 25 MAIN ELECTRONIC CONTROL/IGNITION P.C.B. Warning: After cleaning or replacement as detailed above, it is deemed necessary to undertake a com- bustion analysis as detailed in section "11 .3 Adjust- ment - Chimney Sweep Function" on page 30 . - 25 -...
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Page 26: Thermal Control In The
MAIN ELECTRONIC CONTROL/IGNITION P.C.B. 9 .7 Thermal control in the mode Switch in the function mode Taking circulator off water from the domestic hot circulator on fan still water circuit? Is primary circuit Main circuit pressure stop circulator (3min) temperature higher than that switch consense? selected? lock memorised? -
Page 27: Mode
MAIN ELECTRONIC CONTROL/IGNITION P.C.B. 9 .8 Thermal control in the mode Switch in the function mode See functioning with the function Taking Request for heat from water from the domestic hot control in the mode room thermostat? water circuit? (sec. 9.7) circulator off fan still circulator on... -
Page 28: Control Panel Electronic P.c.b
CONTROL PANEL ELECTRONIC P.C.B. 10 CONTROL PANEL ELECTRONIC P .C .B . FUNCTION 10 .1 Function Heating NTC probe failure DHW NTC probe failure External NTC probe failure Flue gas NTC probe failure (interruption) Lockout due to tripping of the flue gas probe Parasite flame Figure 10 .1 Return NTC probe failure A D.H.W. - Page 29 CONTROL PANEL ELECTRONIC P.C.B. FUNCTION Flame detected (burner ignited) Boiler in DHW anti-freeze phase (the symbol flashes) Boiler in heating anti-freeze phase (the symbol flashes) Heating set temperature (all other symbols are disabled) DHW set temperature (all other symbols are disabled) Boiler in chimney sweep function. To activate the chimney sweep function, set “parameter P06≠0”.
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Page 30: Gas Valve
GAS VALVE 11 GAS VALVE 11 .3 Adjustment - Chimney Sweep Function Warning: isolate the boiler from the mains electrici- 11 .1 Function ty supply before removing any covering or compo- nent . The gas valve "1" in Figure 11.1 controls the gas inflow to the boiler burner. - Page 31 GAS VALVE 13 Open at least one hot water tap fully. RESET Figure 11 .9 20 Allow the analyser to give a stable reading. 21 Read the CO % value. It should be between: Model BASICA Type gas % value (range) Figure 11 .4 COND 24C Natural (G20)
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Page 32: Checks
GAS VALVE vate the function. Upper on-off operator approx. 6400 * RESET Lower on-off operator approx. 920 * *at ambient temperature. Figure 11 .13 Figure 11 .16 28 Press F (Figure 11.4) to exit “programming mode” (Figure 11.14). 11 .5 Removal of the gas valve Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- RESET... - Page 33 GAS VALVE lows . 7 Remove the brass plug and turn the plastic screw inside it fully clockwise until it stops. Do not overtight. 8 Turn it counter-clockwise 2 and 3/4 turns. 9 Adjust the gas valve using the flue analyser as described in section "11.3 Adjustment - Chimney Sweep Function"...
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Page 34: Primary Circuit Pressure Switch
PRIMARY CIRCUIT FLOW SWITCH 12 PRIMARY CIRCUIT PRESSURE SWITCH 12 .2 Removal Warning: isolate the boiler from the mains electrici- 12 .1 Function ty supply before removing any covering or compo- nent . The Primary circuit pressure switch ("1" in Figure 12.1) function is to check the presence of water in the primary hydraulic circuit 1 Remove the front and right hand side panels of the case, turn and that the pressure is above the minimum. -
Page 35: Expansion Vessel And Pressure Gauge
EXPANSION VESSEL AND PRESSURE GAUGE 13 EXPANSION VESSEL AND PRESSURE 13 .3 Removal of the expansion vessel GAUGE Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- 13 .1 Function nent . The Expansion vessel ("1" in Figure 13.1) function is to allow for 1 Remove the front and right hand side panels of the case, turn the volume expansion of the C.H. -
Page 36: H .W . Flow Switch, Filter And Flow Limiter
D.H.W. FLOW SWITCH, FILTER AND FLOW LIMITER 14 D .H .W . FLOW SWITCH, FILTER AND 14 .3 Removal of the sensor FLOW LIMITER Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- 14 .1 Function nent . -
Page 37: Removal Of The Flow Switch Group And D.h.w. Circuit Filter
D.H.W. FLOW SWITCH, FILTER AND FLOW LIMITER 14 .5 Removal of the flow switch group and D.H.W. circuit filter Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent . 1 Please remove the sensor first as previously described and ensure it remains dry. 2 Remove the front panel of the case and empty the D.H.W. -
Page 38: Ntc Heating Delivery Probe - Ntc Maximum
TEMPERATURE PROBE 15 NTC HEATING DELIVERY PROBE - NTC 15 .2 Checks MAXIMUM TEMPERATURE AND D .H .W . Temperature-resistance relationship TEMPERATURE PROBE NTC Warning: isolate the boiler from the mains electrici- 15 .1 Function ty supply before removing any covering or compo- The NTC probe has the function of converting the temperature nent . - Page 39 TEMPERATURE PROBE Warning: to lubricate the O-ring gaskets exclusively use a silicone base grease compatible to be in con- tact with foods and approved by the local water Au- thorities . Figure 15 .4 - 39 -...
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Page 40: By-Pass Valve
BY-PASS VALVE 16 BY-PASS VALVE reversing the order of removal. 16 .1 Function Warning: to lubricate the O-ring gaskets exclusively The By-pass valve "1" in Figure 16.1 is located between the C.H. use a silicone base grease compatible to be in con- water flow and return and its function is that of guaranteeing a tact with foods and approved by the local water Au- minimum flow across the primary heat exchanger if the circula-... -
Page 41: Fan And Air Box
FAN AND AIR BOX 17 FAN AND AIR BOX 17 .1 Function The function of the Fan "1" (Figure 17.1) is to force the mixture of air and gas into the burner. The function of the Air box "2" is to mix the gas and the air in the right proportion. -
Page 42: Ignition / Detection Electrode And Burner
IGNITION AND DETECTION ELECTRODES 18 IGNITION / DETECTION ELECTRODE 18 .2 Removal of the ignition / detection elec- AND BURNER trode Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- Electrodes disclaimer . nent . -
Page 43: Removal Of The Rear Insulation
IGNITION AND DETECTION ELECTRODES 3 Unscrew the nuts "5" (Figure 18.1) and remove the cover of the combustion chamber. 4 Remove the front insulation panel (see section "18.3 Remov- al of the front insulation panel" on page 42). 5 Unscrew the screws "7" (Figure 18.4) and remove the burner. 6 Assemble the burner carrying out the removal operation in reverse order. - Page 44 IGNITION AND DETECTION ELECTRODES Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent . 1 Remove all the case panels and the sealed chamber lid. 2 Check for the integrity of the insulation of wires which con- nect the electrode.
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Page 45: Flue Temperature Probe Ntc And Safety
FLUE TEMPERATURE PROBE NTC AND SAFETY THERMAL FUSE 19 FLUE TEMPERATURE PROBE NTC AND placed. SAFETY THERMAL FUSE 19 .1 Function The Flue temperature probe NTC and Safety thermal fuse "1" in Figure 19.1 and Figure 19.2 senses the temperature of the combustion products that flow through the condensing heat ex- changer. - Page 46 FLUE TEMPERATURE PROBE NTC AND SAFETY THERMAL FUSE 12500 12000 11500 11000 10500 10000 9500 9000 8500 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 1000 °C 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Figure 19 .4 - 46 -...
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Page 47: Condensate Trap
CONDENSATE TRAP 20 CONDENSATE TRAP 20 .3 Removal Warning: isolate the boiler from the mains electrici- 20 .1 Function ty supply before removing any covering or compo- nent . The condensate trap "1" in Figure 20.1 and Figure 20.2 allows the discharge of the condensate via the condensate drain pipe 1 Remove the front and right case panels. -
Page 48: Short Spare Parts List
Manufacturer part no . Burner BI1563 102 Expansion vessel BI1462 100 Condensing heat exchanger (mod. M275V.2024 SM - M275V.2428 SM) BI2002 100 Condensing heat exchanger (mod. M275V.2832 SM) BI2112 118 Fan (mod. M275V.2024 SM - M275V.2428 SM) BI1713 115 Fan (mod. M275V.2832 SM) - Page 49 SHORT SPARE PARTS LIST Figure 21 .1 - 49 -...
- Page 50 NOTE - 50 -...
- Page 52 *1796234850* 17962.3485.0 1622 52A4 Biasi UK Ltd Commercial Road Leamore Enterprise Park WALSALL WS2 7NQ Sales Tel. 01922 714600 Tech. Service Tel. 01922 714636 www.biasi.co.uk...
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