Table of Contents
Advertisement
Quick Links
Wall hung, fanflue, roomsealed, high efficiency gas boiler
Service manual
GARDA PLUS HE
Models
M110B.24SM/E
M110B.32SM/E
Leave this manual adjacent to the gas meter
Warning:
Service / repairs must be carried out, only by a qualified Gas Safety
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.
G.C. Appl. No.
47---583---13
47---583---14
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Biasi M110B.24SM/E
Summary of Contents for Biasi M110B.24SM/E
- Page 1 Wall hung, fanflue, roomsealed, high efficiency gas boiler Service manual GARDA PLUS HE Models G.C. Appl. No. M110B.24SM/E 47---583---13 M110B.32SM/E 47---583---14 Leave this manual adjacent to the gas meter Warning: Service / repairs must be carried out, only by a qualified Gas Safety Registered Engineer, who will be responsible for the current Regulations for gas appliances.
-
Page 3: Table Of Contents
TABLE of CoNTENTS 1 ovERALL INfoRMATIoN......4 12 PRIMARy CIRCUIT fLoW SWITCH ....28 Overall View . -
Page 4: Overall Information
ovERALL INfoRMATIoN ovERALL INfoRMATIoN 1.1 overall view Flue temperature Safety thermal probe NTC fuse Condensing heat Condensing exchanger air heat exchanger purger valve Burner Ignition electrodes Expansion Detection vessel Spark electrode Generator Air box Transformer Safety thermostat Gas restrictor C.h. pressure relief valve Air hose Automatic... -
Page 5: General Access And Emptying Hydraulic Cir
GENERAL ACCESS AND EMPTyING HyDRAULIC CIRCUITS GENERAL ACCESS AND EMPTyING HyDRAU- LIC CIRCUITS 2.1 Nomenclature figure 2.2 To remove the side panels loosen the screws C and D (Figure 2.3), bring the base of the panels away from the boiler and lift them, freeing them from the top hooks. -
Page 6: Access To The Sealed Chamber
GENERAL ACCESS AND EMPTyING HyDRAULIC CIRCUITS 6 Remove the screws F and remove the control panel lid (Fig- 2 Remove the front and right panels of the boiler. ure 2.5). 3 Open the drain tap J (Figure 2.8) until the boiler is completely emptied. -
Page 7: Diagrams
DIAGRAMS DIAGRAMS 3.1 Wiring diagram M110B.24SM/... M110B.32SM/... Electric supply Three way D.h.w. temperature terminal block diverter valve probe NTC C.h. temperature probe NTC External controls terminal block Gas valve Pump gnye bu 3 2 1 D.h.w. flow switch gnye gnye bn bu bk bu rd wh bk... -
Page 8: Circuit Voltages
DIAGRAMS 3.2 Circuit voltages during c.h. or d.h.w. operation Electrical voltages with burner on only during c.h. operation only during d.h.w. operation Pump 3 way D.h.w. diverter valve Flow switch Gas valve Supply network Safety Transformer Main circuit thermostat pressure switch figure 3.2 - 8 -... -
Page 9: Fault Finding
fAULT fINDING fAULT fINDING ¥ - 9 -... - Page 10 fAULT fINDING ¥ - 10 -...
-
Page 11: Condensing Heat Exchanger
CoNDENSING HEAT ExCHANGER CoNDENSING HEAT ExCHANGER 5.1 function The Condensing heat exchanger A in Figure 5.1 has the function 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 12: Cleaning
CoNDENSING HEAT ExCHANGER 14 Remove the Condensing heat exchanger by levering it and sliding it forwards. 15 Reassemble the Condensing heat exchanger carrying out the removal operations in reverse order. Ensure to tighten the nuts H - 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... -
Page 13: H.w. Heat Exchanger
D.H.W. HEAT ExCHANGER D.H.W. HEAT ExCHANGER 6.1 function The d.h.w heat exchanger A in Figure 6.1 and Figure 6.3 allows the instantaneous transfer of heat from the primary hydraulic cir- cuit to the water destined for d.h.w use. figure 6.3 5 Remove the pump following the instructions in section "Re- moval"... -
Page 14: Pump
PUMP PUMP els, lower the control panel and empty the primary circuit. Remove the pump head by undoing the screws which hold it to the 7.1 function pump body and check that the impeller is firmly joined to the rotor. The pump A in Figure 7.1 and Figure 7.2 has the function of mak- ing the water in the main circuit circulate through the main con- 7.3 Removal densing heat exchanger and therefore through the c.h. -
Page 15: Three Way Diverter Valve
THREE WAy DIvERTER vALvE THREE WAy DIvERTER vALvE 8.1 function The diverter valve A (Figure 8.1) has the function of modifying the Spindle B not visible 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 exchanger towards the c.h. -
Page 16: Removal Of The Diverter Group And Its Internal Parts
THREE WAy DIvERTER vALvE figure 8.4 8.4 Removal of the diverter group and its internal parts 1 Remove the front and both side case panels. 2 Empty the primary circuit and the d.h.w circuit of the boiler. 3 Remove the electric actuator (section "Removal of the elec- tric actuator"... -
Page 17: Electronic Control/Ignition P.c.b
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. The fundamental function of the Electronic control/ignition p.c.b. is that of controlling the boiler in relation to the external needs 9.1 function (i.e. heating the dwelling or heating the water for d.h.w. use) and operating in order to keep the temperature of the hydraulic cir- cuits constant. -
Page 18: Checking The Temperature
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. figure 9.2 1 x7 - x16 connector - electric supply terminal block and exter- nal controls terminal block. 2 Fuse F1, F2 3,15 A F 3 Fuse F3, 400 mA T 4 x15 connector - flame detection electrode 5 x12 connector - pump and 3 way diverter valve 6 x17 connector - gas valve 7 x14 connector - external temperature probe (optional) 8 x9 connector - safety thermostat, flue temperature probe... -
Page 19: Operation Lights
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. Normally, the result of the comparison between these two signals directly operates the fan speed adjusting the useful output gen- Flue temperature probe NTC lock out erated in order to stabilize the temperature of the exiting water. Open flue temperature probe NTC If during the d.h.w. -
Page 20: Reignition Frequency Setting
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. Where: Where: Lamp OFF Lamp OFF Lamp ON Lamp ON figure 9.7 figure 9.11 At this step it is possible to visualize the current setting by keep- At this step it is possible to visualize the current setting by keep- ing the reset button 9 pressed for more than 5 seconds. - Page 21 ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. The spare electronic control/ignition p.c.b. is set for natural gas. If the boiler is fed with different gas type, go through the Gas conversion operations described in the Installation manual. If an external temperature probe (optional) is fitted, the coef- ficient K has also to be set as described in the Commission- ing chapter of the installation manual.
-
Page 22: Thermal Control In The
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. 9.10 Thermal control in the " "mode Switch in the function mode Taking circulator off water from the domestic hot circulator on fan still water circuit? stop circulator (3min) Is primary circuit Main circuit pressure Operation lights temperature higher than that switch consense? selected? -
Page 23: Thermal Control In The
ELECTRoNIC CoNTRoL/IGNITIoN P.C.B. 9.11 Thermal control in the " " mode Switch in the function mode See functioning with the function Taking Request for heat from control in the mode water from the domestic hot room thermostat? water circuit? (sec. 9.11) circulator off fan still circulator on... -
Page 24: Transformer
TRANSfoRMER TRANSfoRMER smaller larger connector connector 10.1 Removal clamp for fitting the transformer smaller larger connector connector figure 10.2 10.2 Check the transformer Warning: isolate the boiler from the mains electricity supply before removing any covering or component. 1 Remove the Transformer (see section "Removal" page 24) 2 Measure the electrical resistance of the primary and second- ary windings. -
Page 25: Gas Valve
GAS vALvE GAS vALvE 11.3 Adjustment Warning: isolate the boiler from the mains electrici- 11.1 function ty supply before removing any covering or compo- The gas valve A in Figure 11.1 controls the gas inflow to the boiler nent. burner. Check the supply pressure before making any adjustment to the gas valve. -
Page 26: Checks
GAS vALvE 11.4 Checks Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent. Check the on-off operators coils 1 Remove the front panel of the case. 9 10 2 Disconnect the electrical connector E (Figure 11.2). figure 11.4 3 Measure the electrical resistance between the connector pins 15 Keep pressed the reset button 9 for about 10 seconds (Figure... - Page 27 GAS vALvE figure 11.9 6 Unscrew the screws N and remove the valve (Figure 11.10). 7 Reassemble the valve carrying out the removal operations in reverse order. figure 11.10 Before fitting a new gas valve, it is advisable to pre-set it as hereafter explained.
-
Page 28: Primary Circuit Flow Switch
PRIMARy CIRCUIT fLoW SWITCH PRIMARy CIRCUIT fLoW SWITCH 1 Remove the switch as explained in section "Removal" page 12.1 function 2 Measure the electrical resistance between the tabs marked D The Primary circuit flow switch (A in Figure 12.1) function is to and N.O. (Figure 12.3). detect water flow rate through the primary hydraulic circuit of the The contact must close (resistance zero) with c.h. - Page 29 PRIMARy CIRCUIT fLoW SWITCH When assembling the membrane, ensure that its concave side faces towards the actuator plate I and the reference in- dicated aligns with the seat J (see figure 12.5). 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.
-
Page 30: Expansion Vessel And Temperature-Pressure
ExPANSIoN vESSEL AND TEMPERATURE-PRESSURE GAUGE ExPANSIoN vESSEL AND TEMPERATURE- PRESSURE GAUGE 13.1 function The Expansion vessel (B in Figure 12.1 function is to allow for the volume expansion of the c.h. circuit water due to the tem- perature rise. 13.2 Checks 1 Turn off the flow and return isolation valves and empty the primary circuit of the boiler. -
Page 31: H.w. Flow Switch, Filter And Flow Limiter
D.H.W. fLoW SWITCH, fILTER AND fLoW LIMITER D.H.W. fLoW SWITCH, fILTER AND fLoW LIMITER 14.1 function The d.h.w. flow switch A in Figure 14.1 is a device that generates an electrical signal when hot water is drawn. figure 14.3 14.3 Checks Warning: isolate the boiler from the mains electrici- ty supply before removing any covering or compo- nent. -
Page 32: Flow Limiter
D.H.W. fLoW SWITCH, fILTER AND fLoW LIMITER 14.6 flow limiter The M110B.24SM/... model is factory fitted with a 10 litre/min. flow limiter. If on the M110B.32SM/... model the flow rate of the d.h.w. circuit is too high, it is possible to limit it by installing a flow limiter. The following sizes are available: Nominal flow rate (litres/min) Colour Blue Pink To install the flow limiter: 1 Remove the flow switch group as explained in the section "Removal of the flow switch group and d.h.w. circuit filter"... -
Page 33: Temperature Probe
TEMPERATURE PRoBE TEMPERATURE PRoBE 15.2 Checks Temperature-resistance relationship 15.1 function The Temperature probe has the function of converting the tem- Warning: isolate the boiler from the mains electrici- perature of the water in the hydraulic circuit where it is installed ty supply before removing any covering or compo- into an electrical signal (resistance). -
Page 34: By-Pass Valve
By-PASS vALvE By-PASS vALvE 16.2 Removal Warning: isolate the boiler from the mains electrici- 16.1 function ty supply before removing any covering or compo- The By-pass valve A in Figure 16.1 is located between the c.h. nent. water flow and return and its function is that of guaranteeing a minimum flow across the primary heat exchanger if the circula- 1 Remove all the case panels. tion across the c.h. -
Page 35: Fan And Air Box
fAN AND AIR Box fAN AND AIR Box 17.1 function The function of the Fan A (Figure 17.1) is to force the mixture of air and gas into the burner. The function of the Air box B is to mix the gas and the air in the right proportion. -
Page 36: Ignition And Detection Electrodes, Burner And Spark Generator
IGNITIoN AND DETECTIoN ELECTRoDES IGNITIoN AND DETECTIoN ELECTRoDES, BURN- ER AND SPARk GENERAToR 18.1 function Three electrodes are fitted on the fan-burner group. Two of them, fitted on the right side of the fan-burner group A, are the ignition electrodes B and are connected to the spark generator C. On the left side is the detection electrode D and it detects the pres- ence of the flame. -
Page 37: Removal Of The Front Insulation Panel
IGNITIoN AND DETECTIoN ELECTRoDES 36). 3 Remove the front insulation panel (Figure 18.6). 4 Assemble the new front insulation carrying out the removal op- eration in reverse order. When fitting the new panel ensure that the electrodes holes coincide with the holes of the combustion chamber. burner gasket front insulation Siliconic gasket figure 18.6 Caution:... -
Page 38: Removal Of The Spark Generator
IGNITIoN AND DETECTIoN ELECTRoDES 18.6 Removal of the spark generator Warning: isolate the boiler from the mains electricity Warning: isolate the boiler from the mains electricity supply before removing any covering or component. supply before removing any covering or component. 7 mm 1 Remove all the case panels and the sealed chamber lid. -
Page 39: Safety Thermostat
SAfETy THERMoSTAT SAfETy THERMoSTAT 19.3 Removal Warning: isolate the boiler from the mains electrici- 19.1 function ty supply before removing any covering or compo- The safety thermostat A in Figure 19.1 is a device that senses nent. the temperature of the primary circuit water which flows in the outlet pipe of the condensing heat exchanger. -
Page 40: Flue Temperature Probe Ntc And Safety Ther
fLUE TEMPERATURE PRoBE NTC AND SAfETy THERMAL fUSE fLUE TEMPERATURE PRoBE NTC AND SAfETy shown in Figure 20.3) may be damaged and must be replaced. THERMAL fUSE 20.1 function The Flue temperature probe NTC A in Figure 20.1 and Figure 20.2 senses the temperature of the combustion products that flow through the condensing heat exchanger. -
Page 41: Condensate Trap
CoNDENSATE TRAP CoNDENSATE TRAP 21.1 function The condensate trap A in Figure 21.1 and Figure 21.2 allows the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of combustion products. A plastic ball closes the trap outlet in case that the trap is empty. figure 21.2 figure 21.1 If the drain pipe becomes blocked, or condensate cannot drain,... -
Page 42: Short Spare Parts List
SHoRT SPARE PARTS LIST SHoRT SPARE PARTS LIST Manufacturer Manufacturer’s key G.C. part no. Description Q.ty part no. reference H58-688 Burner (mod. M110B.24SM/...) BI1293 100 H58-689 Burner (mod. M110B.32SM/...) BI1293 101 E94-576 Expansion vessel BI1182 105 CIMM 7 litres H58-659 Condensing heat exchanger (mod. - Page 43 SHoRT SPARE PARTS LIST figure 22.1 - 43 -...
- Page 44 *1796214550* 17962.1455.0 0412 44A4 Biasi Uk Ltd Commercial Road Leamore Enterprise Park WALSALL WS2 7NQ Sales Tel. 01922 714600 Tech. Service Tel. 01922 714636 www.biasi.co.uk...
Need help?
Do you have a question about the M110B.24SM/E and is the answer not in the manual?
Questions and answers