Biasi Activ A 25C Service Manual
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Biasi Activ A 25C Service Manual

Biasi Activ A 25C Service Manual

Activa series wall hung, fan flue, room sealed, high efficiency gas boiler
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Wall hung, fan flue, room sealed, high efficiency gas boiler
Service manual
ActivA
Models:
Activ A 25C
Activ A 30C
Activ A 35C
Activ A 18S
Activ A 25S
Activ A 30S
Leave this manual adjacent to the gas meter
G.C. Appl. No.
47---583---21
47---583---22
47---583---23
41---583---11
41---583---12
41---583---13

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  • Page 1 Wall hung, fan flue, room sealed, high efficiency gas boiler Service manual ActivA Models: G.C. Appl. No. Activ A 25C 47---583---21 Activ A 30C 47---583---22 Activ A 35C 47---583---23 Activ A 18S 41---583---11 Activ A 25S 41---583---12 Activ A 30S...

  • Page 2: Table Of Contents

    Removal of the pressure gauge ..Wiring diagram D.h.w. flow switch, filter and flow limiter 33 Activ A 25C Activ A 30C.Activ A 35C..14.1 Function ......

  • Page 3: Overall Information

    Overall information Overall View Flue temperature probe NTC Safety Expansion thermostat vessel C.h. temperature probe Condensing heat exchanger Ighition Detection electrodes electrode Burner Pipe silencer Condensate trap C.h. pressure relief valve Air box (air/gas mixer) Automatic air purger valve Electronic control box D.h.w.

  • Page 4: General Access And Emptying Hydraulic Circuits

    General access and emptying hydraulic circuits Nomenclature Fig. 2.3 To remove the side panels loosen the screws B (Fig. 2.2) and C (Fig. 2.3). Pull the side panels towards the outside. Fig. 2.1 Control panel Right side panel Front panel Warning: isolate the boiler from the mains electricity supply before removing any Control panel...

  • Page 5: Main Electronic P.c.b. Box

    General access and emptying hydraulic circuits Fig. 2.7 Fig. 2.5 Remove the terminal block lid E (Fig. 2.6). Free the hooks placed on the three sides indi- Main electronic p.c.b. box cated and rotate the lid towards left (Fig. 2.8). Warning: isolate the boiler from the mains electricity supply before removing any covering or component.

  • Page 6: Emptying The D.h.w. Circuit

    General access and emptying hydraulic circuits CLOSED OPEN Fig. 2.11 Emptying the d.h.w. circuit Close the d.c.w. inlet cock H (Fig. 2.9). Open one or more hot water taps until the boiler has been completely emptied. Fig. 2.10...

  • Page 7: Wiring Diagram Activ A 25C Activ A 30C.activ A 35C

    Diagrams Wiring diagram Activ A 25C Activ A 30C.Activ A 35C. Three way Gas valve Condensate diverter valve trap Ignition Flame detection electrodes electrode Pump gnye gnye Flue temp. probe NTC D.h.w. temp. probe NTC D.h.w. flow switch Fuse 2AF 250VAC...

  • Page 8: Wiring Diagram

    Diagrams Wiring diagram Activ A 18S Activ A 25S Activ A 30S Gas valve Condensate trap Ignition Flame detection electrodes electrode Pump gnye gnye Flue temp. probe NTC Fuse 2AF 250VAC Primary circuit 5x20 pressure switch C.h. temperature probe NTC gnye Safety thermostat...

  • Page 9: Circuit Voltages

    Diagrams 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 3 way Pump D.h.w. diverter valve Flow switch Gas valve Safety Supply network Main circuit thermostat pressure switch...

  • Page 12: Display Diagnostic

    Display diagnostic An help for the fault finding may be given by the display indications. The display on the control panel gives many informa- tion. Only the indications useful for the fault finding are here described. The following table gives the relationship between the indications of error of the display and their meaning.

  • Page 13: Condensing Heat Exchanger

    Condensing heat exchanger Function The Condensing heat exchanger A in Fig. 5.1 has the function of transferring heat produced from combus- tion of the gas and from the flue exhausted gas to the water circulating in it. Fig. 5.1 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.

  • Page 14: Cleaning

    Condensing heat exchanger Loosen the connection R and remove the pipe S Using pliers, remove the spring U moving it down- from the Condensing heat exchanger. wards and disconnect the rubber pipe V (Fig. 5.4). Unscrew the screws T . Loosen the screws W (Fig.

  • Page 15: H.w. Heat Exchanger

    D.h.w. heat exchanger Remove the panels of the case. Empty the primary circuit and the d.h.w circuit of Function the boiler. The d.h.w heat exchanger A in Fig. 6.1 and Fig. 6.3 al- Remove the control panel following the instruc- lows the instantaneous transfer of heat from the primary tions from 3 in section 2.3.

  • Page 16: 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. 7.1 and Fig. 7.3 has the function of Remove the pump head by undoing the screws which making the water in the main circuit circulate through hold it to the pump body and check that the impeller is...

  • Page 17: Removal Electrical Capacitor

    Pump Remove the connector M of the cover box by levering with a screwdriver in as shown in (Fig. 7.5) Fig. 7.5 Remove the capacitor connection block N freeing Fig. 7.4 it from the hook O and pulling it as indicated by C.H.

  • Page 18: Three Way Diverter Valve

    Three way diverter valve Function Spindle B visible The diverter valve A (Fig. 8.1) has the function of mod- ifying 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 8.3). Remove the fixing spring H (Fig. 8.6) and remove the primary circuit pressure switch I.

  • Page 20: Main Electronic Control/Ignition P.c.b

    Main electronic control/ignition The fundamental function of the Main electronic con- trol/ignition p.c.b. is that of controlling the boiler in rela- p.c.b. tion to the external needs (i.e. heating the dwelling or heating the water for d.h.w. use) and operating in order Function to keep the temperature of the hydraulic circuits con- stant.

  • Page 21: Checking The Temperature

    Main electronic control/ignition p.c.b. Some of these devices are directly accessible by the The temperature of the water is converted into an elec- user (function control, temperature adjustment etc.) tric signal by means of temperature probes. others, like the fuses, are accessible by removing the The user, setting the desired temperature with the con- main electronic p.c.b.

  • Page 22: Setting The Boiler Control Function Modes

    Main electronic control/ignition p.c.b. Fig. 9.6 To move trough the parameters press c.h. set keys (A or C Fig. 9.7) 90 ˚C Fig. 9.7 The display shows Fig. 9.8 Fig. 9.4 Normally, the result of the comparison between these two signals directly operates the fan speed adjusting the useful output generated in order to stabilize the temperature of the exiting water.
  • Page 23 Pr 12 00 ÷ 99 (0÷100%) Max. useful output in c.h. mode factory set: 74 = Activ A 25C 79 = Activ A 30C. Fig. 9.11 86 = Activ A 35C. To reset the boiler to the normal operation press con- 99 = Activ A 18S temporary the 3 keys (A --- B --- C Fig.

  • Page 24: Checks

    Main electronic control/ignition p.c.b. Delicately flex the hooks D in the directions indi- PARAMETER DIGIT VALUES cated (Fig. 9.12) in order to release the circuit Not used Pr 19 from the box. Not used Pr 20 Remove the Main electronic control/ignition p.c.b..

  • Page 25: Thermal Control In The " " Mode

    Main electronic control/ignition p.c.b. 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 26: Thermal Control In The " " Mode

    Main electronic control/ignition p.c.b. 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. 9.7) circulator off fan still circulator on...

  • Page 27: Control Panel Electronic P.c.b

    Control panel electronic p.c.b. To scroll the values press B (reduce) and A (increase). keys (Fig. 10.1). In order to exit the INFO mode, hold keys A and C (Fig. 10.1) pressed at the same time. 10.1 Function The following table gives details of each parameter and the possible value that can be show.
  • Page 28 Control panel electronic p.c.b. Unscrew the screws B Delicately flex the hooks C in the directions indi- cated (Fig. 10.3) in order to release the circuit from the box. Remove the Control panel electronic p.c.b.. Reassemble the Control panel electronic p.c.b. carrying out the removal operations in the reverse order.

  • Page 29: Gas Valve

    Gas valve Gas valve inlet pressure test point 11.3 Adjustment 11.1 Function The Gas valve A in Fig. 11.1 controls the gas inflow to Warning: isolate the boiler from the mains the boiler burner. electricity supply before removing covering or component. Check the supply pressure before making any ad- justment to the gas valve.
  • Page 30 Gas valve Model Type gas % value (range) Activ A 25C Natural (G20) 8,6 --- 9,2 Activ A 30C. Activ A 35C Activ A 35C. Propane (G31) 9,5 --- 10,1 Activ A 25S Activ A 30S Activ A 18S Natural (G20)

  • Page 31: Checks

    Remove the front panel of the case as explained Model Type gas % value in the section 2.3 of this manual. (range) Disconnect the connector D (Fig. 11.12). Activ A 25C Natural (G20) 9,3 --- 9,9 Activ A 30C Activ A 30C. Propane (G31) 10,3 --- 10,9 Activ A 35C.

  • Page 32: Primary Circuit Flow Switch

    Primary circuit flow switch N.O. 12.1 Function The Primary circuit flow switch (A in Fig. 12.1) function is to check the presence of water in the primary hy- draulic circuit and that the pressure is above the mini- mum. Fig. 12.2 12.3 Removal Warning: isolate the boiler from the mains...

  • Page 33: Removal Of The Expansion Vessel

    Primary circuit flow switch Remove the protective cap E (Fig. 13.1) from the Remove the front and right hand side panels of valve on the top of the expansion vessel and con- the case, turn off the flow and return isolation nect a suitable air pressure gauge.
  • Page 34 Primary circuit flow switch Re---assemble the parts in reverse order of re- moval. Fig. 13.5...

  • Page 35: H.w. Flow Switch, Filter And Flow Limiter

    D.h.w. flow switch, filter and flow Filter Sensor holder spring limiter Sensor 14.1 Function The d.h.w. flow switch A in Fig. 14.1 is a device that generates an electrical signal when hot water is drawn. Fig. 14.3 14.3 Checks Warning: isolate the boiler from the mains electricity supply before removing any covering or component.

  • Page 36: Flow Limiter

    Flow limiter To install the flow limiter: Remove the flow switch group as explained in the The Activ A 25C model is factory fitted with a 10 litres/ section 14.5. min. flow limiter. Separate the flow switch plug 1 from the body 4 The Activ A 30C.

  • Page 37: 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 38 Temperature probe Fig. 15.4...

  • Page 39: Removal

    By---pass valve 16.1 Function The By---pass valve A in Fig. 16.1 is located between the c.h. water flow and return and its function is that of guaranteeing a minimum flow across the primary heat exchanger if the circulation across the c.h. system is completely closed.

  • Page 40: Fan And Air Box

    Fan and Air box Disconnect the rubber pipe D . Unscrew the gas connector E 17.1 Function Remove the fixing fork F and remove the gas pipe The function of the Fan A (Fig. 17.1) is to force the mix- Disconnect the connector H ture of air and gas into the burner.

  • Page 41: Ignition And Detection Electrodes And Burner

    Ignition and detection electrodes Disconnect the ignition electrodes connector E and the earth wire F (Fig. 18.1) and disconnect and burner the detection electrode connector G. Unscrew the screws H and remove the ignition 18.1 Function electrodes B and the detection electrode C Three electrodes are fitted on the fan---burner group.
  • Page 42 Ignition and detection electrodes Check the connection wires. earth electrode 3,5 mm Ignition electrode Fig. 18.4...

  • Page 43: Safety Thermostat

    Safety thermostat Warning: isolate the boiler from the mains electricity supply before removing any 19.1 Function covering or component. The safety thermostat A in Fig. 19.1 is a device that Electrical function senses the temperature of the primary circuit water Remove all the case panels and the lid of the which flows in the outlet pipe of the condensing heat ex- sealed chamber.

  • Page 44: Flue Temperature Probe Ntc And Safety Thermal Fuse

    Flue temperature probe NTC and 20.2 Removal Safety thermal fuse Warning: isolate the boiler from the mains electricity supply before removing any 20.1 Function covering or component. The Flue temperature probe NTC A in Fig. 20.1 and Fig. 20.2 senses the temperature of the combustion Remove all the case panels.

  • Page 45: Condensate Trap

    Condensate trap 21.3 Removal 21.1 Function Warning: isolate the boiler from the mains electricity supply before removing any The condensate trap A in Fig. 21.1 and Fig. 21.2 allows covering or component. the discharge of the condensate via the condensate drain pipe avoiding in the mean time the escape of Remove the front and right case panels.

  • Page 46: Short Spare Parts List

    Key G.C. part no. Description Q.ty Manufac- Manufacturer’s reference turer part no. Burner (mod. Activ A 25C, Activ A 18S) BI1313 100 Burner (mod. Activ A 30C., Activ A 35C., BI1313 101 Activ A 25S, Activ A 30S) Expansion vessel BI1462 100 Condensing heat exchanger (mod.
  • Page 47 Short spare parts list...
  • Page 48 *1796218251* 17962.1825.1 2909 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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