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Mikrofill Ethos 24cc Maintenance Instructions Manual

Condensing combination
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Mikrofill Ethos
Condensing combination boiler
Maintenance Instructions
24cc

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Summary of Contents for Mikrofill Ethos 24cc

  • Page 1 Mikrofill Ethos Condensing combination boiler Maintenance Instructions 24cc...
  • Page 2 “This record must be completed and left with the end user” CE Mark Mikrofill gas appliances comply with the requirements contained in CE Mark documents contained with European directives applicable to them. In particular, these appliances comply with the CE directives and technical specifications contained within them :...

  • Page 3: Table Of Contents

    CONTENTS 1. TECHNICAL AND DIMENSIONAL CHARACTERISTICS … … … … … … … … … … … 4 1.1. Pump Characteristics… … … … … … … … … … … … … … … … … … … … … … … … … 4 1.2.

  • Page 4: Technical And Dimensional Characteristics

    1. TECHNICAL AND DIMENSIONAL CHARACTERISTICS 1.1. Pump Characteristics The pump has 3 different speeds. According to these speeds pump performance curve is given at the diagram on the left. I : first speed II : second speed III : third speed The factory speed setting of 1000 2000...

  • Page 5: Hydroblock Diagrams

    1.3. HYDROBLOCK DIAGRAMS 1.3.1.Connections Diagram 8 1.3.2.Central Heating Mode Diagram 9 ? When the system is operating in Central Heating Mode, cold water which comes from Central Heating Return pipe is directed to pump inlet. Water reaches to inlet of primary heat exchanger from outlet of pump. With heat transfer in primary heat exchanger, hot water is supplied.
  • Page 6 1.3.3.Domestic Hot Water Mode Diagram 10 ? Switching to Domestic Hot Water System: When a tap is opened, cold water reaches to hydroblock from Cold Water Inlet. The pressure is sensed by the diaphragm by means of pressure connection pipes (shown as “a”). The diaphragm (b) moves with the difference in pressures.

  • Page 7: Safety Devices

    2. SAFETY DEVICES The combination boiler incorporates a visual led display that indicates fault conditions, should they occur. In the event of a fault, the display will indicate, by means of leds, exactly in which area the fault lies. Should the boiler fail to operate during Commissioning, the most likely fault is that the gas supply to the boiler has not been turned on or purged sufficiently or that there is no pressure in the heating system.

  • Page 8: Settings

    3. SETTINGS Gas valve setting All boilers are tested and factory set during manufacture. Should it be necessary to reset a gas valve, for example, after replacement, proceed as follows: Shut down boiler. Minimum setting (See values on table A) Remove electrical connectors from the modulating Diagram 2 gas valve coil, see diagram 32.
  • Page 9 On board adjustments: potentiometers and trimmers. MAX RISC: maximum heating mode trimmer, 0 -100 %. 0 % corresponds to the minimum value mechanically set on the MFC: 30 mA with NG, 50 mA with LPG. To set MAX RISC to minimum, turn it counter-clockwise. To increase the maximum heating value, turn it clockwise. RLA: step opening level trimmer, 0 -100 %.

  • Page 10: Routine Cleaning And Inspection

    4. ROUTINE CLEANING AND INSPECTION To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at regular intervals. The frequency of servicing will depend upon the particular installation conditions and usage, but in general once a year should be enough.
  • Page 11 4.3. Heat exchanger ? Disconnect power supply leads and earth lead from fan. ? Remove combustion chamber cover as described in 6.3. ? To empty only heating system by turning central heating safety valve’ s tap (red) to the left. ? Remove pipe clips on the left pipes of heat exchanger, see diagram 12.
  • Page 12 4.4. Burner ? Undo main gas supply nut and pressure check point screw and nut from burner, see diagram 17. Note: The washers between burner and the chamber lower part and between burner and the gas valve must be kept for use on reassembly. ? Undo gas supply pipe between gas valve and burner, see diagram 18.

  • Page 13: Replacement Of Parts

    ROUTINE CLEANING AND INSPECTION 4.5. Flue system Check externally to make sure that flue is not blocked Inspect flue system to make sure that all fittings are secure. 4.6. Operation of fan Switch on electrical supply and turn on gas. Light burner by opening a hot water tap.
  • Page 14 5.4. To replace fan ? Remove electrical leads of fan. ? Unscrew the screws of fan as shown on diagram 26. ? Remove the fan, see diagram 27. ? Fit replacement fan in reverse order to removal. ? Reconnect electrical leads. WARNING: Earth cable must be connected.
  • Page 15 5.6. To replace printed circuit board (PCB) ? Gain access to rear of control panel. ? Unscrew and remove external controls/mains connection access cover. ? Unscrew the screws around the PCB plastic cover to gain access to PCB, see diagram 31. ? Carefully pull off electrical connections to PCB.
  • Page 16 5.7. To replace pump Drain down heating circuit of the boiler only, as described previously. Note : It is not necessary to drain down entire heating system to carry out this work. Undo the two fixing nut at rearside and upside of the pump.
  • Page 17 5.9. To replace gas valve ignition module Locate ignition module attached to side of gas valve. Remove screws securing cover onto ignition module, see diagram 39. Disconnect ignition and flame sense leads from module. Remove cover and disconnect 12 pin and 2 pin multi-plug from module.
  • Page 18 Disconnect electrical connections to gas valve modulating coil. Undo main gas supply tube nut from gas valve, see diagram 43. Note : The washer must be kept for use on reassembly. Undo main gas connection nut between gas valve supply tube and gas inlet valve. Note : The washer must be kept for use on reassembly.
  • Page 19 5.13. To replace central heating expansion vessel Replacement of the expansion vessel is not possible with the boiler on the wall. Drain down heating and hot water circuit of boiler, as follows: Close all isolating valves. Note : All valves are closed when slots or lever are at the right angles to direction of flow.
  • Page 20 5.15. To replace combustion chamber insulation 5.19. To replace ignition electrode (See dia. 13) Remove upper front panel as described in ‘ Routine Remove burner as described in ‘ Routine Cleaning Cleaning and Inspection’ . an inspection’ . Remove heat exchanger as described previously. Undo and remove screw securing electrode onto burner.
  • Page 21 5.22. To replace hydroblock Remove gas valve as described in section 5.10. Remove pump as described in section 5.7. Remove central heating and domestic hot water pipe connections as described in ‘ Routine Cleaning an inspection’ . Remove expansion vessel pipe as shown in diagram 46 and 52.

  • Page 22: Fault Finding

    6. FAULT FINDING 6.1. FAULT CODES ON LED DISPLAY DIAGNOSTIC PANEL When this led is When this led is blinking, there is a blinking, the pressure problem in heating of heating system is system NTC. low. When this led is blinking, there is a problem in sanitary water NTC.

  • Page 23: Fault Finding Charts

    6.2. FAULT FINDING CHARTS Chart 1 Check electrical supply – C. H. water pressure and frost protection Check the following carifully before starting Gas supply is turn on, is adequate and purged Electricity supply is turn on Polarity is correct CH pressure is set between 1-2 bar CH pump spins freely D.H.W.
  • Page 24 FAULT FINDING Chart 2 Check Domestic Hot Water Operation Open DHW taps DHW flow rate at least 2.3 lt/min ? Check cold water inlet pressure Check and if necessary Is sanitary water NTC replace DHW sensor led flashing ? Check if water Check and if necessary filter is clean replace water flow...
  • Page 25 FAULT FINDING Chart 4 Check fan/flue gas system Does fun run ? Is air pressure switch activated ? Is 230 Vac present across fan terminals ? Go to chart 5 Differantial air pressure across Check and if necessary the air pressure Check air pressure switch replace fan switch is greater...
  • Page 26 FAULT FINDING Chart 6 Check Ignition Systems When green led is on Is overheat thermostat Check related Does sparking start at led or sanitary water sensors and if NTC led or heating necessary burner ? system NTC led or replace them water pressure led flashing ? Does burner light ?

  • Page 27: Service Procedure

    7. SERVICE PROCEDURE 7.1. Appliance Checks Carry out gas soundness test. Check appliance is fitted correctly and location is satisfactory. Check room air ventilation requirements as necessary and check compartment air ventilation requirements necessary. Check that flue, f1ue joints and terminations are satisfactory and free from spillage. Check heat exchanger for any blockage or evidence of shale where applicable.

  • Page 28: Wiring Diagram

    8. WIRING DIAGRAM...

  • Page 29: Short Parts List

    9. SHORT PARTS LIST PART ORDER NUMBER DESCRIPTION CODE HYDROBLOCK 3002194576 MICROSWITCH 3004090525 LOSS OF WATER SENSOR 3002194470 SAFETY VALVE 3002192756 PUMP 3004090672 EXPANSION VESSEL 3002209450 AUTOMATIC AIR VENT 3002189946 GAS VALVE 3002194930 BURNER 3000000250 EXCHANGER 3000000251 CONTROL PANEL 3002194491 COVER 3002194492 PCB COVER...

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