1. Manuals
  2. Brands
  3. Savio Manuals
  4. Boiler
  5. 120MFS
  6. Service manual

Savio ACQUAPIU 120MFS Service Manual

Hide thumbs Also See for ACQUAPIU 120MFS:
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
Models covered by these instructions
120MFS
124MFS
120RFS
Wall hung, fan flue, room sealed gas boiler
British Gas service listed
Leave this manual adjacent to the gas meter
Biasi U.K. Ltd
Unit 32/33, Planetary Road
Industrial Estate, Neachells Lane
Willenhall, Wolverhampton WV 13 3XB
Tel: 01902 304 400
Table of contents
1
Overall information
1.1
Overall View
1.2
Hydraulic diagram
2
General access & emptying hydr. circuits
2.1
Nomenclature
2.2
Body panels
2.3
Control panel
2.4
Access to the electronic circuits
2.5
Access to the sealed chamber
2.6
Emptying the main circuit
2.7
Emptying the d.h.w. circuit
3
Diagrams
3.1
Wiring diagram
3.2
Functional flow diagrams
3.3
Control circuit voltages
4
Fault finding
5
Main heat exchanger
5.1
Characteristics
5.2
Removal
5.3
Cleaning
6
D.h.w. heat exchanger
6.1
Function
6.2
Removal
6.3
Mounting the exchanger
6.4
Hydraulic circuit run
7
Pump
7.1
Function
7.2
Checks
7.3
Removal
8
3-way valve
8.1
Function
8.2
Checks
8.3
Removal
9
Electronic control circuit
9.1
Function
9.2
Selection and adjustment devices
9.3
Checking the temperature
9.4
Function selectors
9.5
Pump function mode
9.6
Ignition gas pressure regulator
9.7
Max. c/h power regulator
9.8
Checks
9.9
Removing operations
9.10
Mounting operation
(G.C.NO. 47 970 02)
(G.C.NO. 47 970 03)
(G.C.NO. 41 970 01)

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the ACQUAPIU 120MFS and is the answer not in the manual?

Questions and answers

Related Manuals for Savio ACQUAPIU 120MFS

Summary of Contents for Savio ACQUAPIU 120MFS

  • Page 1 SERVICE MANUAL Models covered by these instructions 120MFS (G.C.NO. 47 970 02) 124MFS (G.C.NO. 47 970 03) 120RFS (G.C.NO. 41 970 01) Wall hung, fan flue, room sealed gas boiler British Gas service listed Leave this manual adjacent to the gas meter Biasi U.K.

  • Page 2: Overall Information

    9.11 Heat control in ”c/h+d.h.w.” function 9.12 Heat control in ”d.h.w. only” function Full sequence ignition device 10.1 Function 10.2 Checks 10.3 Removal 10.4 Ignition and control seauence Gas valve 11.1 Function 11.2 Nomenclature of the parts 11.3 SIT 827 Valve - adjustment 11.4 SIT 827 Valve - modulating operator 11.5...

  • Page 3: General Access And Emptying Hydraulic Circuits

    1.2 Hydraulic diagram fig. 2 2 General access and emptying hydraulic circuits 2.1 Nomenclature...

  • Page 4: Body Panels

    fig. 3 2.2 Body panels WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. For the most part of the check and maintenance operations it is necessary to remove one or more panels of the body. The side panels can be removed only after the removal of the front panel.

  • Page 5: Control Panel

    To remove the side panels loosen screws B (fig. 5) bring the base of the panels far from the boiler and lift them, freeing them from the top hooks. fig. 5 To remove the lower protection loosen the four screws C (fig.

  • Page 6: Access To The Sealed Chamber

    2.4 Access to the electronic circuits WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. To remove the service panel ”5”: 1. Place a small screwdriver with a blade in the two slots indicated in fig.

  • Page 7: Emptying The Main Circuit

    fig. 10 2.6 Emptying the main circuit 1. Remove the lower protection of the boiler 2. Close the c/h circuit isolation valves F (fig. 11); 3. Loosen the plugs G until the boiler is completely emptied. fig. 11...

  • Page 8: Emptying The D.h.w. Circuit

    To facilitate the downflow of water, remove the front panel, also remove the sealed chamber lid) and loosen the manual bleed valve. H (fig. 10) placed near the inlet pipe fitting of the main heat exchanger. Close it again once the emptying has been completed. 2.7 Emptying the d.h.w.

  • Page 9: Functional Flow Diagrams

    3.2 Functional flow diagrams...

  • Page 11: Control Circuit Voltages

    3.3 Control circuit voltages...

  • Page 12: Fault Finding

    a: never zero (short circuit) never 12V= (open circuit) Electrical voltages in Volts during normal operation with burner on at maximum power 4 Fault finding...

  • Page 15: Main Heat Exchanger

    5 Main heat exchanger 5.1 Characteristics The main heat exchanger (A in fig. 12) has the function of transferring heat of the gas produced by combustion to the water circulating in it. fig. 12 The hydraulic circuit is composed of 8 elliptical pipes connected in parallel (fig.
  • Page 16 5.2 Removal WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. 1 Empty the main circuit of the boiler 2 Remove the front panel of the body 3 Remove the right side panel of the body and the sealed chamber cover. 4 Remove the cover of the combustion chamber 5 Separate the heat exchanger from the hydraulic circuit, loosening the inlet and outlet pipe fittings B (fig.
  • Page 17 The d.h.w heat exchanger (A in fig. 15) allows the instantaneous transferral of heat from the primary hydraulic circuit to the water destined for d.h.w use. fig. 15 The water structure and flow paths are shown in fig. The primary circuit runs along the heat exchanger from the top towards the bottom and inside the heat exchanger there are two parallel flows. Between these two flows the d.h.w circuit water circulates against the current.
  • Page 18 6 Remove the bracket that holds the heat exchanger to the frame (top plug side) by unscrewing the screw that fastens it to the frame 7 loosen the lower pipe fitting G (fig. 18); fig. 18 8 Remove the d.h.w heat exchanger together with the two lower pipes, extracting it: from the top (400 mm clearance minimum) from the side window beginning from the lower extremity (130 mm clearance minimum) from the bottom (600 mm clearance minimum)
  • Page 19 4. Fit the pipes E and F (fig. 17) to the top plug of the d.h.w heat exchanger, to the d.h.w flow switch (fig. 19) and to the outlet connection of the boiler. 5. fix them with the forks. 6. Screw up the top pipe fitting H (fig.
  • Page 20 7 Pump...
  • Page 21 7.1 Function The pump (A in fig. 21) has the function of making the water in the main circuit circulate through the main heat exchanger and therefore through the c/h system (during the c/h function) or through the secondary heat exchanger (during the d.h.w. function). fig.
  • Page 22 isolate the boiler from the mains electricity supply before removing any covering or component. Check that the pump is not seized and that the movement of the rotor is not subject to mechanical impediments. With the boiler off, remove the front panel and lower the instrument panel. Remove the air release plug of the pump and turn the rotor with a screwdriver.
  • Page 23 fig. 25 On one side of the motor body an indicator is visible with which it is possible to know the position of the diverter. fig. 26 fig. 27 indicate the relationship between the electric command coming from the electronic control circuit, the position of the indicator B and the consequent hydraulic function.
  • Page 24 isolate the boiler from the mains electricity supply before removing any covering or component. fig. 28 demonstrates the relationship between the position of the indicator visible on the motor body of the valve and the electrical resistance of the motor. fig.

  • Page 25: Electronic Control Circuit

    3 Release the electrical connector from the motor group. Removal of the hydraulic group 1. Empty the primary hydraulic circuit 2. Remove the motor group (see operations 1,2 and 3); 3. Loosen the pipe fitting E (fig. 31); 4. completely loosen the pipe fittings F (fig.

  • Page 26: Selection And Adjustment Devices

    9.2 Selection and adjustment devices On the control circuit several selection, adjustment and protection devices are located. (fig. 33). fig. 33...

  • Page 27: Checking The Temperature

    Several of these devices are directly accessible by the user (function switch, temperature adjustment potentiometers etc.) others are accessible by removing the service panel. 9.3 Checking the temperature The control circuit makes it possible to separately adjust the c/h water flow and d.h.w. outlet temperature. The temperature of the water is converted into an electric signal by means of temperature probes.

  • Page 28: Function Selectors

    When the boiler functions in d.h.w. (fig. 35), the signal coming from the d.h.w. temperature probe is compared with the signal given by the instrument panel through the adjustment made by the user (knob fig. 35 Normally, the result of the comparison between these two signals directly operates the adjustment elements of the gas valve, adjusting the useful output generated in order to stabilize the temperature of the exiting water.
  • Page 29 Selector 2 It selects the functioning of the boiler on the basis of the type of gas used. It allows the selection of the maximum supply current given to the modulator device. To set correctly the selector follow the table of fig.

  • Page 30: Ignition Gas Pressure Regulator

    During c/h functioning the pump can be controlled in three different manners. The pump functioning mode can be selected using the position of the electric link A in fig. fig. 40 9.6 Ignition gas pressure regulator By using the device ”8” (fig.
  • Page 31 The F2 fuse can be reached by removing the service panel. If the fuse is blown replace it with one that has the same characteristics after having identified the cause of the interruption. Check for the presence and the correct positioning of the electric link which selects the functioning mode of the pump, referring to section 9.5.
  • Page 32 Before fitting the control circuit, ensure that the control spindles (fig. 45) are correctly inserted in the c/h and d.h.w. temperature adjustment knobs. fig. 45 WARNING: after having installed the control circuit check that the c/h and d.h.w. temperature adjustment knobs can move freely (half a turn). 9.11 Heat control in function fig.
  • Page 33 9.12 Heat control in function...

  • Page 34: Full Sequence Ignition Device

    10 Full sequence ignition device 10.1 Function The flame ignition and control device used on electronic ignition boilers with forced flue gas expulsion carries out the following fundamental functions: does a sequence of operations (ignition cycle) which lead to the ignition of the gas at the burner checks the presence of the flame during the entire period in which it is activated supplies the fan and checks its functioning by means of the signal coming from the flue gas pressure switch.
  • Page 35 10.3 Removal WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. 1 Remove the rear lid of the instrument panel, clearing it from the hooks placed in correspondence with the arrows printed on the lid (see chapter access to and emptying hydraulic circuits).

  • Page 36: Ignition And Control Sequence

    Reassemble the full sequence ignition device carrying out the removing operations in reverse order. 10.4 Ignition and control sequence fig. 50...

  • Page 37: Gas Valve

    11 Gas valve 11.1 Function...

  • Page 38: Nomenclature Of The Parts

    The gas valve controls the gas inflow to the boiler burner. By means of an electric command given to the on-off operators the passage of the gas through the valve can be opened or closed. By means of an electric command given to the modulating operator the pressure can be varied and therefore the gas flow rate to the burner (modulation).
  • Page 39 Refer to this table during any gas conversion operations. To replace the cartridge, remove the protection hood of the max/min adjustment and with a spanner rotate cartridge A counter-clockwise (fig. 53); fig. 53 11.5 SIT 827 Valve - check Check the electrical integrity WARNING: isolate the boiler from the mains electricity supply before removing any covering or component.
  • Page 40 11.7 SIT 837-Valve - adjustment fig. 55 Proceed as described in section 11.3. 11.8 SIT 837 Valve- modulating operator For the adjustment field as well as for the replacement of the cartridge, refer to section 11.4. 11.9 SIT 837 Valve-check Check the electrical completeness WARNING: isolate the boiler from the mains electricity supply before removing any covering or component.

  • Page 41: Main Circuit Flow Switch

    Electrical resistance of the operators: lower on-off operator: about 900 Ω upper on-off operator: about 900 Ω modulating operator: about 125 Ω 11.10 SIT 837 Valve - removal WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. 1.
  • Page 42 This device controls the regular functioning of the pump, the presence of water in the primary circuit of the boiler and the absence of obstructions of the main heat exchanger during the c/h function as well as during the d.h.w. function. The main circuit flow switch is connected to the electronic control circuit and its intervention prevents or stops the burner ignition cycle but does not send the boiler in the lock state.
  • Page 43 fig. 60 4 Disconnect the electrical terminals from the microswitch 5 Loosen the two screws D (fig. 61) and remove the flow switch body from the pipe fig. 61 6 Reassemble the flow switch, carrying out the operations in reverse order being careful to make the reference engraved in the pipe correspond with the same reference on the body of the flow switch.
  • Page 44 The device is part of the d.h.w. hydraulic body B (fig. 64). fig. 64 When the flow rate of the hot water drawn goes over about 2 litres/min’, the float contained in the flow switch is dragged upwards and the magnet in it, getting closer to the external sensor C (fig.

  • Page 45: Removal Of The Sensor

    Measure the electrical resistance at the leads of the sensor. Without water being drawn, the contact must be open. By opening a hot water cock the contact must close (electrical resistance zero Ω). 13.3 Removal of the sensor WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. 1 Remove the front panel of the boiler and lower the instrument panel 2 Close the d.h.w.

  • Page 46: Removal Of The Filter

    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. 13.5 Removal of the filter 1. remove the front panel of the boiler and lower the instrument panel 2.

  • Page 47: Temperature Probes

    14 Temperature probes 14.1 Function The temperature probe has the function of converting the temperature of the water of the hydraulic circuit where it is installed into an electric signal (resistance). The relation between temperature and electrical resistance is stated in fig.

  • Page 48: Removal Of The D.h.w. Temperature Probe

    14.2 Checks Temperature-resistance relationship WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. Disconnect the cable from the temperature probe. Measure the temperature of the pipe near the temperature probe and check the electrical resistance according to the graph in fig.
  • Page 49 The by-pass valve is adjustable by using screw B (fig. 73); rotating it clockwise, the useful head given to the system increases. fig. 73 15.2 Adjustment To ensure that the by-pass valve is suitably adjusted and carries out its function giving the c/h circuit the maximum useful head, proceed as follows: WARNING: isolate the boiler from the mains electricity supply before removing any covering or component.

  • Page 50: Flue Fan, Venturi, Air Pressure Switch

    5 Start the boiler in c/h (the operation can be done with the gas supply closed and boiler locked). 6 Rotate the adjustment screw of the by-pass valve until the microswitch of the c/h flow switch clicks 7 Rotate the adjustment screw one turn counter-clockwise. 15.3 Removal WARNING: isolate the boiler from the mains electricity supply before removing any covering or component.
  • Page 51 fig. 76b 16.2 Checks Check the venture pressure WARNING: this test must be carried out with the lid of the sealed chamber cover correctly in place. Remove the plug of the pressure test pointA placed on the upper side of the boiler (fig.
  • Page 52 Disconnect the connectors B (fig. 78) and measure the electrical resistance of the motor. fig. 78 Electrical resistance of the motor: fan of fig. 76a about 90 Ω fan of fig. 76b about 40 Ω. Check of the air pressure switch operation WARNING: isolate the boiler from the mains electricity supply before removing any covering or component.

  • Page 53: Removal Of The Air Pressure Switch

    1. Remove the front panel of the body, the right side panel and the lid of the sealed chamber 2. Disconnect the connectors B (fig. 78); 3. Disconnect pipe D which connects the venturi device to the pressure test point 4.

  • Page 54: Ignition And Detection Electrodes

    17 Ignition and detection electrodes 17.1 Function Three electrodes are fitted on the burner. Two of them are the ignition electrodes and are fitted near the front part of the burner. The ignition sparks take place between their metallic edges over the central ramp of the burner during the ignition sequence. The third electrode is the detection electrode and it detects the presence of the flame.
  • Page 55 Check the integrity of the detection electrode and ensure that its metallic edge is correctly placed over the ramp of the burner. Check the connection wires WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. Remove the front panel of the body, the lid of the sealed chamber and the cover of the combustion chamber.

  • Page 56: Safety Thermostat

    18 Safety thermostat 18.1 Function The safety thermostat (A in fig. 87) is a device that senses the temperature of the main circuit water which flows in the outlet pipe of the main heat exchanger. If the temperature control system of the boiler fails and the temperature of the main circuit reaches a dangerous temperature, the safety thermostat opens the electric circuit which supply the gas valve on -off operators.
  • Page 57 the switch D which is placed on the instrument panel (fig. 90). fig. 89 fig. 90 18.2 Checks WARNING: isolate the boiler from the mains electricity supply before removing any covering or component. Position of probe and integrity Remove the front panel of the body, the right side panel and the sealed chamber cover Verify the soundness of the fitting between the main circuit pipe and the temperature probe C (fig.
  • Page 58 thermostat and no overheat intervention should occur. It is not permissible to change the factory setting of the safety thermostat. The safety thermostat must be replaced if its operation temperature is too low and therefore constantly interrupts the correct functioning of the boiler and not allowing it to reach its maximum permissible operating temperatures.
  • Page 59 19.4 Temperature probes...

  • Page 60: Short Spare Parts List

    19.5 Fan 20 Short spare parts list...

This manual is also suitable for:

Acquapiu 124mfsAcquapiu 120rfs

Table of Contents