VOKERA Compact A User Instructions
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VOKERA Compact A User Instructions

High efficiency combi boiler
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Compact A
High effi ciency combi boiler
40
Users Instructions
Installation &
Servicing
Instructions
Compact A 25 G.C. N° 47-364-17
Compact A 29 G.C. N° 47-364-18
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.

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  • Page 1 Compact A High effi ciency combi boiler Users Instructions Installation & Servicing Instructions Compact A 25 G.C. N° 47-364-17 Compact A 29 G.C. N° 47-364-18 THESE INSTRUCTIONS TO BE RETAINED BY USER Vokèra is a licensed member of the Benchmark scheme which aims to improve the standards of installation and commissioning of domestic hot water systems in the UK.

  • Page 2: Table Of Contents

    Users instructions Installation Page Things you should know Page Delivery Gas appliances Contents Electrical supply Unpacking Guarantee registration card Preparation for mounting the appliance Appliance Log Book (UK only) Fitting the fl ue How does it work? Connecting the gas & water Dimensions Electrical connections Clearances required...

  • Page 3: Users Instructions

    INTRODUCTION Dear Customer Your Vokèra Compact A boiler has been designed to meet and exceed the very latest standards in gas central heating technol- ogy, and if cared for, will give years of reliable use and effi ciency. Please therefore take some time to read these instructions carefully.

  • Page 4: Pressure Gauge

    Fig. 1 MODE HOT WATER SELECTOR SWITCH TEMPERATURE HEATING SELECTOR DISPLAY TEMPERATURE PRESSURE GAUGE SELECTOR HOT WATER TEMPERATURE SELECTOR Move the selector clockwise to increase the hot water outlet temperature, or counter-clockwise to reduce the temperature PRESSURE GAUGE Ensure the system pressure is set correctly (minimum 0.5-bar) MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR Mode selector switch: Hot water only - Select this position if you want the boiler to supply hot...

  • Page 5: Getting Started Page

    The appliance frost protection is active in all the boiler modes. The temperature selectors can be used to vary the temperature Although the Vokèra Compact A has been designed for simplicity of the water that circulates around your radiators and the water of use, it utilises the latest in boiler technology, enabling a host that fl...

  • Page 6: How To

    3. HOW TO... 3.3 HOW TO SHUT DOWN THE SYSTEM FOR 3.1 HOW TO TOP-UP THE SYSTEM PRESSURE SHORT PERIODS (fi g. 1-2) The system and boiler can be shut down for short periods by The system pressure must be checked periodically to ensure the simply turning the time clock to the off position.

  • Page 7: What If

    4. WHAT IF... 4.1 WHAT IF I SUSPECT A GAS LEAK If you suspect a gas leak, turn off the gas supply at the gas Advice for homeowners meter and contact your installer or local gas supplier. If you Please contact Vokèra Customer Service (0844 3910999 (UK) require further advice please contact your nearest Vokèra offi...

  • Page 8: Installation And Servicing Instructions

    Code of Practise, which can be obtained from used with the Vokèra twin fl ue system. www.centralheating.co.uk. The Compact A is approved for use with C13 & C33 type fl ue The Compact A comprises a range of high-effi ciency combina- applications.

  • Page 9: Principle Components

    SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.5 SAFETY DEVICES 1.1 PRINCIPLE COMPONENTS When the appliance is in use, safe operation is ensured by: • A fully integrated electronic control board featuring electronic • a water pressure switch that monitors system water pressure temperature control, anti-cycle control, pump over-run, self- and will de-activate the pump, fan, and burner should the diagnostic fault indicator, full air/gas modulation...

  • Page 10: Central Heating

    SECTION 2 - TECHNICAL DATA 2.1 Central Heating Compact A 25 Compact A 29 Heat input (kW) 20.00 25.00 Maximum heat output (kW) 60/80°C 19.50 24.45 Minimum heat output (kW) 60/80°C 4.91 5.90 Maximum heat output (kW) 30/50°C 20.84 26.23 Minimum heat output (kW) 30/50°C...

  • Page 11: Effi Ciency

    Below an opening or window on a pitched roof 2000 mm From a vertical terminal to an adjacent opening (window, air-brick, etc.) (call Vokera technical for advice) From a vertical terminal to an adjacent vertical terminal 300 mm (only if both terminals are the same hight)

  • Page 12: Related Documents

    SECTION 3 - GENERAL REQUIREMENTS (UK) This appliance must be installed by a competent person in ac- BS 5440 Part 1, when the terminal is 0.5 metres (or less) below cordance with the Gas Safety (Installation & Use) Regulations. plastic guttering or 1 metre (or less) below painted eaves. 3.1 RELATED DOCUMENTS 3.5 AIR SUPPLY The installation of this boiler must be in accordance with the...

  • Page 13: Electrical Supply

    purposes. The feed pipe should be connected to the return pipe 3.11 SHOWERS as close to the boiler as possible. If the appliance is intended for use with a shower, the shower 3.6.8 FREQUENT FILLING must be thermostatically controlled and be suitable for use with Frequent fi...

  • Page 14: Air Supply

    3A.7 ELECTRICAL SUPPLY the terminal must be protected by a guard of durable material. The guard must be fi tted centrally over the terminal. Refer to The appliance is supplied for operation on 230V @ 50Hz I.S. 813, when the terminal is 0.5 metres (or less) below plastic electrical supply;...

  • Page 15: Delivery

    SECTION 4 - INSTALLATION 29450126 1000mm extension 1000mm 4.1 DELIVERY 29450127 2000m extension 2000mm Due to the weight of the appliance it may be necessary for 29450128 Telescopic extension 372/519mm two people to lift and attach the appliance to its mounting. The Wall bracket pack (5) 208mm appliance is contained within a heavy-duty cardboard carton.
  • Page 16 4.5.1.2 FITTING THE REAR FLUE (fi g. 15) (rear fl ue outlet only) Using the template provided, mark and drill a 125mm hole for the passage of the fl ue pipe. The hole should be drilled LEVEL to ensure any condense fl uid that forms, is allowed to drain back to the appliance.
  • Page 17 IMPORTANT 4.5.2 CONCENTRIC VERTICAL FLUE The vertical fl ue terminal is 1.0 metre in length and cannot be The appliance can be used with either the Vokèra condensing cut; therefore it may be necessary to adjust the height of the 60/100mm concentric fl...
  • Page 18 • A 130mm hole is required for the passage of the concentric INSTALLATION OF TWIN ADAPTOR KIT (fi g. 19 & 20) terminal through the ceiling and/or roof. • Insert the exhaust connection manifold (A) onto the appliance fl ue outlet. Depending on site conditions it may be preferable to install the •...

  • Page 19: Connecting The Gas & Water

    4.6 CONNECTING THE GAS AND WATER The appliance is supplied with an accessory pack that includes Hot water outlet service valves. The service valves are of the compression type. Gas cock Cold water inlet The accessory pack contains sealing washers’ etc, for use stopcock with the service valves.

  • Page 20: Electrical Connections

    4.7 ELECTRICAL CONNECTIONS The boiler is supplied with a 2-metre fl y-lead. This lead can be used for connection to the electrical supply. Connect the fl y-lead to a fused plug or fused isolator in the following way: • brown wire to LIVE supply •...

  • Page 21: Gas Supply Installation

    SECTION 5 - COMMISSIONING 5.1 GAS SUPPLY INSTALLATION (see 7.8) particularly continuity, polarity and resistance to earth; Inspect the entire installation including the gas meter, test for • ensure the 3 AMP fuse – supplied with the appliance – has tightness and purge.

  • Page 22: Regulating The Central Heating System

    The boiler is supplied with the following fl ow restrictor. To validate the appliance warranty, it’s necessary to register Compact A 25: 8 - litres fl ow restrictor the appliance details with us. The warranty can be registered Compact A 29: 10 - litres fl ow restrictor in several ways: •...

  • Page 23: Component Removal Procedure

    6.4 COMPONENT REMOVAL PROCEDURE To remove a component, access to the interior of the appliance is essential. Isolate the appliance from the electrical supply and remove the fuse. And when necessary, close all service valves on the appliance, remove the appliance casing as described in section 4.7.1 and drain the water content from the appliance via the drain valve.

  • Page 24: Gas Valve

    ing note of all wiring connections and jumper tag confi guration. Unhook and remove connection block (P). Disconnect all wiring from the PCB, locate and remove the PCB securing screws, remove the required PCB. Replace in the reverse order ensur- ing that the position of the 2 control knobs are correctly aligned with the respective potentiometers on the PCB.

  • Page 25: Main Heat Exchanger

    6.16 MAIN HEAT EXCHANGER (fi g. 37) Carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Locate and remove the gas pipe locking pin (A1) and swing/rotate the gas pipe away from the fan assembly (B1), (if necessary unscrew the gas pipe from the gas valve G1).

  • Page 26: Flue Collector Removal

    6.20 FLUE COLLECTOR REMOVAL (fi g. 41) Carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Remove the heat exchang- er as per 6.16. Locate and remove the screw (Y1) that secures the fl ue gas analysis test point cover (Z1). Disconnect the fl ues thermistor wiring connections.

  • Page 27: Checking Appliance Operation

    SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING 7.1 CHECKING APPLIANCE OPERATION will continue to rise until the set point is achieved or the water temperature will fall whereby fan speed will increase relative to When carrying out any repairs or servicing to the appliance, the output required.

  • Page 28: Combustion Analysis Test

    1 OHM. If the resistance is greater than 1 OHM check all earth CO reading of less than 350ppm cannot be achieved, please wires and connectors for continuity and integrity. contact Vokera technical for advice. 7.7.2 SHORT CIRCUIT CHECK Isolate the appliance from the electrical supply, and using a...

  • Page 29: Fault Finding

    7.9 COMPONENT VALUES & CHARACTERIS- Live & Neutral connections at the appliance terminal strip. Repeat above test on the Live & Earth connections at the ap- TICS pliance terminal strip. NOTE COMPONENT VALUE Should it be found that the fuse has failed but no fault is indi- 230Vac cated, a detailed continuity check will be required to trace the Pump...

  • Page 30: Adjustments

    7.10 ADJUSTMENTS The boiler has already been adjusted by the manufacturer the value given in the table, use the gas valve maximum during production. If the adjustments need to be made again, adjustment screw for example after extraordinary maintenance, replacement of - Press the “combustion analysis”...
  • Page 31 Compact 25A The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional fl ue gas emission limits it is, however, possible to modify this value, referring to the graphs below. HTG curve (Qnheating) COs.a.
  • Page 32 CLIMATIC CURVES EXTERNAL TEMPERATURE (°C) T80 Maximum set point for standard T range (JP7 removed) T45 Maximum set point for low T range (JP7 inserted) JP7 REMOVED JP7 INSERTED CN12 CN12 CN13 CN13 CN14 CN14 Fig. 47...

  • Page 33: External Wiring

    8.4 VOKÈRA LOWER COVER MECHANICAL CLOCK (fi g. 4) The Vokèra lower cover mechanical clock kit (product code 20025081) is entirely suitable for the Compact A range and eliminates the need for an external time control. The kit is comprised of the following: •...

  • Page 34: Functional Diagram

    FUNCTIONAL DIAGRAM Fig. 51 NOTE: L-N-E connection is advisable...

  • Page 35: Related Documents

    SECTION 9 - LPG INSTRUCTIONS 9.1 RELATED DOCUMENTS BS 5440 PARTS 1 & 2 FLUES & VENTILATION REQUIREMENTS BS 5449 PART 1 FORCED CIRCULATION OF HOT WATER SYSTEMS BS 5482 PART 1 DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 6798...
  • Page 36 10.6.2 GAS VALVE MAXIMUM SETTING Set the CO button at maximum (see 10.3.1), once the maximum is obtained check that it corresponds with the appropriate CO value (Maximum) for the respective appliance. If the CO read- ing is correct, proceed to gas valve minimum setting (10.7.2). However, if the CO reading is incorrect, the maximum gas pressure must be adjusted as follows:...

  • Page 39: Commissioning

    As part of the installation process, ESPECIALLY WHERE A FLUE unless this action is recommended, following HAS BEEN FITTED BY PERSONS OTHER THAN THE BOILER contact with Vokera technical. If any such INSTALLER, visually check the integrity of the whole flue adjustment is recommended and further...
  • Page 40 Registered address: Vokèra Ltd Borderlake House Unit 7 Riverside Industrial Estate London Colney Herts AL2 1HG enquiries@vokera.co.uk www.vokera.co.uk www.vokera.ie Sales, General Enquires T 0844 391 0999 F 0844 391 0998 Vokèra Ireland West Court, Callan Co Kilkenny T 056 7755057 F 056 7755060 Vokèra Limited reserve the right to change...

This manual is also suitable for:

Compact a seriesCompact a 25Compact a 29

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