VOKERA Mynute VHE Installation & Servicing Instructions Manual
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VOKERA Mynute VHE Installation & Servicing Instructions Manual

High efficiency open vent boiler
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Mynute VHE
High efficiency open vent boiler
Installation
& Servicing
Instructions
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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Summary of Contents for VOKERA Mynute VHE

  • Page 1 Mynute VHE High efficiency open vent boiler Installation & Servicing Instructions 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

    Contents Gas valve Design principles & operating sequence Page 6.10 Injectors Principle components 6.11 Electrodes and condense sensor Mode of operation (at rest) 6.12 Flue fan & mixer Mode of operation 6.13 Burner Safety devices 6.14 Main heat exchanger 6.15 Condense trap removal Technical data Page 6.16 Flue collector removal...
  • Page 3 Cylindric Burner Condensate level sensor Main heat exchanger Top AAV pipe Fan assembly Mixer Condensing drain Heating return connection Heating flow connection Gas connection Fig. 1 The Mynute VHE is approved for use with C13 & C33 type flue appliacations...
  • Page 4 2-digit LED GREEN LED RED LED TEMPERATURE SELECTOR display MODE SELECTOR SWITCH Fig. 1A Boiler at reset/standby Select this position if/when the boiler requires to be reset Boiler switched OFF Select this position if you want the boiler to remain OFF (this will over-ride any heating/hot water request from the time-clock/programmer) Boiler switched ON Select this position when you want the boiler to respond to a heating/hot water...

  • Page 5: Design Principles & Operating Sequence

    SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.1 PRINCIPLE COMPONENTS A fully integrated electronic control board featuring ● ● ● ● ● flow electronic temperature control, anti-cycle control, pump main heat temperature exchanger sensor over-run, self-diagnostic fault indicator, full air/gas modulation.

  • Page 6: Technical Data Page

    SECTION 2 TECHNICAL DATA 2.1 Central Heating Mynute 20 VHE Heat input (kW) Maximum heat output (kW) 60/80°C 19.68 Minimum heat output (kW) 60/80°C Maximum heat output (kW) 30/50°C 21.16 Minimum heat output (kW) 30/50°C 5.30 Minimum working pressure 0.1 bar Maximum working pressure 3.0 bar Minimum flow rate...
  • Page 7 Fig. 3 Location Minimum distance Below an opening (window, air-brick, etc.) 300 mm Above an opening (window, air-brick, etc.) 300 mm To the side of an opening (window, air-brick, etc.) 300 mm Below gutter, drain-pipe, etc. 25 mm Below eaves 25 mm Below balcony, car-port roof, etc.

  • Page 8: General Requirements (Uk)

    3.6.2 AUTOMATIC BY-PASS serves. Installation pipes must be fitted in accordance with Vokera recommend that an automatic bypass is installed BS 6891. to ensure the required minimum flow-rate is achieved at all Pipe work from the meter to the appliance must be of times.

  • Page 9: Electrical Supply

    Engineers publication (IGE/UP/7) ‘Guide for Gas Installations in Timber Frame Buildings’. 3.10 INHIBITORS Vokera recommend that an inhibitor - suitable for use with aluminium heat exchangers - is used to protect the boiler and system from the effects of corrosion and/or electrolytic action.

  • Page 10: Related Documents

    NOTE The distance between the cold feed pipe and the safety ● ● ● ● ● vent pipe shall be no more than 150mm The cold feed pipe must be inverted as shown in ● ● ● ● ● figure 4B The safety vent pipe must be 22mm in diameter ●...

  • Page 11: Electrical Supply

    I.S. 813 for 3A.6.2 AUTOMATIC BY-PASS detailed guidance on this aspect. Vokera recommend that an automatic bypass is installed A compartment used to enclose the appliance must be to ensure the required minimum flow-rate is achieved at all designed and constructed specifically for this purpose.

  • Page 12: 11 Appliance Pipework Configuration

    3A.10 INHIBITORS NOTE The distance between the cold feed pipe and the safety Vokera recommend that an inhibitor - suitable for use with ● vent pipe shall be no more than 150mm aluminium heat exchangers - is used to protect the boiler The cold feed pipe must be inverted as shown in fig.

  • Page 13: Installation

    4.5.1 CONCENTRIC HORIZONTAL FLUE (For concentric vertical flue, see 4.5.2). (For twin flue applications, see 4.5.3). The appliance can be used with either the Vokera condensing 60/100mm concentric flue system or the optional 80/ 125mm concentric flue system. NOTE These instructions relate only to the Vokera condensing 60/100mm concentric flue system.
  • Page 14 “X” weatherproofing. The interior and exterior trim can now be fitted. 4.5.2 CONCENTRIC VERTICAL FLUE The appliance can be used with either the Vokera condensing 60/100mm concentric flue system or the optional 80/ 125mm concentric flue system. NOTE These instructions relate only to the Vokera condensing 60/100mm concentric flue system.
  • Page 15 Flat roof flashing plate 90-degree bend 4.5.3 TWIN FLUE SYSTEM 45-degree bends (pair) The Vokera twin flue system enables greater flue distances 500mm extension 500mm to be achieved (see 4.4.2) than that of a concentric flue 1000mm extension 1000 mm system.
  • Page 16 MOUNTING THE BOILER Push-fit the twin flue pipes onto the concentric to twin The fixing holes for the wall-mounting bracket should now converter box ensuring that the exhaust pipe connects to be drilled and plugged, an appropriate type and quantity of the exhaust connection on the concentric to twin converter.

  • Page 17: Connecting The Gas & Water

    4.6 CONNECTING THE GAS AND WATER The appliance is supplied with a 15mm service valve for the gas connection and 22mm copper to brass adapters for the flow and return connections. The service valve is of the compression type. The accessories pack also contains sealing washers etc, for use with the service valve and copper connections.
  • Page 18 4.7.1 CASING REMOVAL (fig. 14) 4.7.3 CONNECTING THE MAINS (230V) INPUT (fig. 16) To gain internal access to the appliance you must first Locate and remove the screws securing the terminal block remove the casing, proceed as outlined below: cover (230V). Pass the supply cable through the cable •...

  • Page 19: Commissioning

    SECTION 5 COMMISSIONING • Ensure the proper electrical checks have been carried 5.1 GAS SUPPLY INSTALLATION Inspect the entire installation including the gas meter, test out, (see 7.8) particularly continuity, polarity, and for soundness and purge. Refer to BS 6891 (I.S. 813 in resistance to earth;...

  • Page 20: Setting The Boiler Operating Temperature

    By completing the warranty registration card and posting ● ● ● ● ● to us using the pre-paid envelope supplied Online at: vokera.co.uk ● ● ● ● ● For UK residents by calling: 0870 607 0281 ● ● ● ● ●...

  • Page 21: General

    It is the law that any servicing work is carried out by competent person such as a Vokera engineer, an approved service agent, British Gas, CORGI registered personnel or other suitably qualified personnel.

  • Page 22: Gas Valve

    note of all wiring connections and jumper tag configuration, disconnect all wiring from the PCB, locate and remove the PCB securing screws, remove the required PCB. Replace in the reverse order ensuring that the position of the 3 control knobs are correctly aligned with the respective potentiometers on the PCB.

  • Page 23: Main Heat Exchanger

    6.15 CONDENSE TRAP REMOVAL (fig. 27) Fig. 24 Carry out component removal procedure as described in 6.4. Disconnect the 2 upper rubbers condense pipe (A). Remove the pin (B) that secures the trap to the air box plate. Disconnect the lower rubber condense pipe (C) from the condense trap.

  • Page 24: Checks, Adjustments And Fault Finding

    4-times then go • AUTOSTOP: Further information on the AUTOSTOP to lockout. When the set-point has been reached (the function, can be obtained from your local Vokera Sales position of the heating temperature selector) as measured Representative.

  • Page 25: Appliance Fan Speeds

    Gas type and appliance fan speed (output) must be set heat. according to the specific appliance specification. Vokera Remove the 3-selector knobs, locate and press the CO accepts no responsibility if the gas type and/or fan speed button (see fig.

  • Page 26: Combustion Analysis Test

    7.5 COMBUSTION ANALYSIS TEST 7.7.4 REVERSED POLARITY OR SUPPLY FAULT A combustion analysis check can easily be carried out on Repeat the above tests at the appliance isolator, if testing the appliance via the test points located on the top of the reveals correct polarity and/or supply at the isolator, re- appliance (see 7.4).

  • Page 27: Fault Codes

    7.10 FAULT CODES When the boiler detects a temporary fault condition, the appropriate code is shown flashing on the display. If/when the fault code is final, the pump will perform a 60-second post circulation and the red LED will be illuminated. CODE CAUSE ALARM TYPE...

  • Page 28: Wiring Diagrams

    If external controls are to be added to the system, they must be connected to the appliance as shown in the following diagrams. For advice on controls that are not featured in this book, please contact Vokera technical on 0870 333 0520. NOTE THE LINK WIRE MUST BE REMOVED IF ●...
  • Page 29 FUNCTIONAL DIAGRAM Fig. 32 NOTE. L-N-E CONNECTION MUST NOT BE INTERCHANGED CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT RATED IS 230 V.a.c. F Hv Fan power supply 230 V X4÷X9 Connection to PCB low voltage F Lv Fan signal control F.O.H.T Flow over heat thermostat E.P.
  • Page 30 FUNCTIONAL DIAGRAM Fig. 33 8.4.1. “S” - Plan with Vokera 2-channel programmer 8.4.2. “Y” - Plan with Vokera 2-channel programmer Fig. 34...

  • Page 31: Exploded Diagrams

    SECTION 9 EXPLODED DIAGRAMS Table 1 POS. DESCRIPTION 20VHE Frame assembly 01005496 Cover assembly 10028554 Printed circuit board 10029717 Led light guide 10028557 Instrumental panel 10028551 Knob assembly 10028559 Case Assembly 01005497 Hinge 01005442 Door panel 10028553 Fuse 3478 Wiring harness 10028596 Wiring harness 10029722...

  • Page 32: Table 2

    Table 2 POS. DESCRIPTION 20VHE Pipe 10029590 Pipe 10029592 Pipe 10029591 Washer 5023 Connection M 3/4 - 3/4 10029526...

  • Page 33: Table 3

    Table 3 POS. DESCRIPTION 20VHE Pipe 10026267 Pipe 10029515 Air venting plug 10029306 Siphon 10028405 Flexible pipe 10028540 Flexible pipe 10027192 Pipe 10028430 Drain tap 01005137 Cock 10028431 Washer 5203 O ring 10026324 Washer 10027193 Flexible pipe 0028539 NTC sensor 10029715 Thermostat 9695...

  • Page 34: Table 4

    Table 4 POS. DESCRIPTION 20VHE Roomsealed chamber 10028341 Roomsealed chamber side 10026231 10028456 Burner assembly 10028537 Spark / ignition electrode 10027864 Condense electrode 10026316 Gas pipe 10029607 Gas valve 10028538 3/4" gas cock 10020897 Cover for air box 10028345 Glass stopper assembly 10026328 Plug 10023805...

  • Page 35: Table 5

    Table 5 POS. DESCRIPTION 20VHE Condensing exchanger assembly 01005443 Conveyor 10028536 Flue drain connection 10028421 Washer Ø 125 10026323 Washer 10026366 Washer Ø 60 10026345 High limit thermostat 10026982 Washer Ø 60 10028426 Combustion cable 10029723 Wiring harness 10027360...

  • Page 36: Instructions

    SECTION 10 LPG INSTRUCTIONS 10.1 RELATED DOCUMENTS BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60 kW BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS BS 5446 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 5440 PART 1 FLUES BS 5482...

  • Page 37: Appliance Fan Speeds

    PCB has been replaced. ATTENTION Gas type and appliance fan speed (output) must be set according to the specific appliance specification. Vokera accepts no responsibility if the gas type and/or fan speed is not correctly adjusted according to the respective appliance specification as detailed on the appliance data badge.

  • Page 38: Benchmark

    BENCHMARK No. GAS BOILER COMMISSIONING CHECKLIST C O L L E C T I V E M A R K BOILER SERIAL No. NOTIFICATION No. CONTROLS To comply with the Building Regulations, each section must have a tick in one or other of the boxes TIME &...

  • Page 39: Service Interval Record

    SERVICE INTERVAL RECORD It is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record Below. Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service as described in the boiler manufacturer’s instructions.
  • 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 391 099 F 0844 391 0998 Vokèra Ireland West Court, Callan Co Kilkenny T 056 7755057 F 056 7755060 Vokèra Limited reserve the right to change...

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