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Mikrofill Ethos 24cc Installation Instructions Manual

Condensing combination boiler
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Mikrofill Ethos
Condensing combination boiler
Installation Instructions
24cc
CE Mark
British Gas Service Listing
G.C.No: 47-157-01
No: 0201055

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Summary of Contents for Mikrofill Ethos 24cc

  • Page 1 Mikrofill Ethos Condensing combination boiler Installation Instructions 24cc CE Mark British Gas Service Listing G.C.No: 47-157-01 No: 0201055...
  • Page 2 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 : Gas Appliances directive 90/396 Efficiencies directive 92/42...

  • Page 3: Table Of Contents

    CONTENTS - COMMISSIONING 1. GENERAL DESCRIPTION … .… … … … … … … … … … … … … … … … … … … … … … . 4 1.1. DESCRIPTIONS AND OPERATION PRINCIPLES OF COMPONENTS / PARTS 2.

  • Page 4: General Description

    1. GENERAL DESCRIPTION The fan flued hermetic type combination boiler is an apppliance that fires Natural gas in its combustion chamber for either heating a place or obtaining domestic hot water. It combines two different functions at same appliance. For this two different function it has two independent circuit.

  • Page 5: Technical And Dimensional Characteristics

    1.1.1. Instructions and Regulations Assembly, Installation, First ignition and maintenance must be carried out by a competent person, in accordance with all-current technical regulations and directives. 1.1.2. C.O.S.H.H. Materials used in the manufacture of this appliance are non-hazardous and no special precautions are required when servicing or maintenance is undertaken.

  • Page 6: Boiler Schematic

    2.2. BOILER SCHEMATIC 1 - Domestic thermistor 2 – Hydroblock 3 - Gas valve 4 - Gas valve ignition module 5 - Fan hood 6 - Burner 7 - Ignition electrodes 8 - Combustion chamber 9 - Integrated heat exchanger 10 - Air pressure switch 11 - Heating safety valve (3 bar) 12 –...

  • Page 7: Boiler Connection Dimensions

    2.3. BOILER CONNECTION DIMENSIONS Diagram 4 Diagram 3 2.4. TECHNICAL DATA Heating Hot water Heating output adjustable from ... (kW) Hot water output to ... (kW) 23.3 automatically variable from ... (kW) from ... (Btu/h) 30368 to ... (kW) 23.3 to ...

  • Page 8: Boiler Flow Diagrams

    2.5. BOILER FLOW DIAGRAMS Combustion products Combustion products Central heating mode Sanitary water mode Diagram 5 Diagram 6 1 - Domestic thermistor 2 – Hydroblock 3 - Gas valve 4 - Gas valve ignition module 5 - Fan hood 6 - Burner 7 - Ignition electrodes 8 - Combustion chamber 9 - Integrated heat exchanger...

  • Page 9: Hydroblock Diagrams

    2.6. HYDROBLOCK DIAGRAMS 2.6.1.Connections Diagram 8 2.6.2.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 10: Pump Characteristics

    ? 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 11: Heating System Design

    2.8. HEATING SYSTEM DESIGN ? The combination boiler is compatible with any type of installation. ? Heating surfaces may consist of radiators, convectors or fan assisted convectors. ? The combination boiler can be piped directly to an underfloor heating system without the need for a mixing bottle.

  • Page 12: Installation

    3. INSTALLATION 3.1. PIPING SYSTEM INSTALLATION Heating system connections - Pipe diam. 22 mm Hot water system connections - Pipe diam.15mm Gas connection - Pipe diam. 22mm Heating safety valve connection - Pipe diam. 15mm 3.1.1. Water connection Connect the system pipework to the boiler observing the correct flow and return format as shown in diagram 12.

  • Page 13: Boiler Location

    3.2. BOILER LOCATION 3.2.1. Clearances The boiler must be at least 1 m. far away from flammable materials. Heat sensitive walls must be protected by suitable insulation. The position of the boiler must be such that there is adequate space for servicing. The recommended clearances are: 50 mm, either side of the boiler, 600 mm at the front of the boiler,...

  • Page 14: Boiler Installation

    The horizontal flue is extended by using one or more of the 1000 Diagram 13 mm extension pipes, available from Mikrofill. These are connected together by push fit type joints, clamps and seals. 3.4.1.1. Calculation of flue cutting lengths for extended flue Using the correct number of extension kits as table 3, measure dimensions a and e, see diagram 15.
  • Page 15 Table 4 The standard flue kit , see diag.11, comprises Flue cutting lengths Flue option Cutting length (mm) Comments Outer pipe Inner pipe - External rubber sealing collar … … … … A Side flue e+a-755 e+a-755 max. dimension - Outer pipe … … … … … … … … … … … .. B (left or right) ‘...

  • Page 16: Electrical Connection

    THE TERMINALS ON THE HEATING CONTROLS CONNECTION PLUG. Warning: This appliance must be wired in accordance with these instructions. Any fault arising from incorrect wiring cannot be put right under the terms of the Mikrofill guarantee. 3.5.1. External controls The combination boiler is designed to operate at maximum efficiency at all times, but will be most efficient and economical when connected to a room thermostat.

  • Page 17: Commissioning

    4. COMMISSIONING 4.1. Filling When cold, system pressure should be about 1 bar. If while running venting off of air dissolved in the water causes the pressure of the central heating system to drop below the minimum level described above, the user must utilise a filling loop to bring it back to the original value. During operation, water pressure in the boiler when hot should be about 1 - 2 bars.
  • Page 18 COMMISSIONING The commissioning and first firing of the boiler must only be done by a competent person. Gas installation It is recommended that any air is purged from the supply at the gas inlet test point on the gas valve, see diagram 20. Filling the system Diagram 20 Open the boiler isolating valves.
  • Page 19 COMMISSIONING Bleed each radiator to remove the air, Open various hot water taps Leave the cap of automatic air re-tighten bleed screws vent on the expansion vessel to bleed system. open. Diagram 25 Diagram 24 Diagram 26 Make sure the pressure gauge on control panel indicates a system pressure of 1 and 2 bar. Refill the system as necessary.

  • Page 20: Lighting The Boiler

    COMMISSIONING 4.3. Lighting the boiler Make sure that: The boiler is connected to the electrical supply. The gas service cock is open. Then follow the instructions below : Turn on the mode selector knob The pressure must be between 1 and 2 bar. If not, the system must be filled by a competent person. To stop boiler turn the selector knob off.

  • Page 21: Setting The Maximum Heating Temperature

    4.6. Setting the maximum heating temperature The maximum heating temperature can be preset at MAX RIS commissioning stage to suit the type of heating system. For example, for use with underfloor heating, the maximum heating temperature can be set to 40 o C. To adjust the maximum temperature, proceed as follows: Remove the jumper cap from the rear of the control panel to gain access to jumper JP3 (see diagram 31).

  • Page 22: Safety Devices

    Rotate the domestic hot water adjustment knob left or right to adjust the maximum temperature of the sanitary water (35 o C to 65 o C). For increasing rotate the knob in clockwise and for decreasing rotate in anti-clockwise. Diagram 33 Rotate the central heating adjustment knob left or right to adjust the maximum temperature of the heating (30 o C to 85 o C).

  • Page 23: Settings

    5. 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 35 gas valve coil, see diagram 35.

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