VOKERA Mynute 28e Installation & Servicing Instructions Manual
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VOKERA Mynute 28e Installation & Servicing Instructions Manual

VOKERA Mynute 28e Installation & Servicing Instructions Manual

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Mynute
28e - 35e
Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

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Summary of Contents for VOKERA Mynute 28e

  • Page 1 Mynute 28e - 35e Installation & Servicing Instructions THESE INSTRUCTIONS TO BE RETAINED BY USER...

  • Page 2: Table Of Contents

    General requirements (EIRE) Page Wiring diagrams Page 3A.1 Related documents External wiring 3A.2 Location of appliance Installation of Vokera twin channel programmer 3A.3 Gas supply Installation of Vokera time clock 3A.4 Flue system 3A.5 Air supply 3A.6 Water circulation Exploded diagrams Page 3A.7 Electrical supply...
  • Page 3 INTRODUCTION The Vokera Mynute is a central heating boiler, which - by The Mynute can also be used with the Vokera twin flue design - incorporates electronic ignition, circulating pump, system. expansion vessel, safety valve, pressure gauge and This appliance is designed for use with a sealed system automatic by-pass.

  • Page 4: Principle Components

    SECTION 1 DESIGN PRINCIPLE AND OPERATING SEQUENCE PRINCIPLE COMPONENTS A fully integrated electronic control board featuring electronic temperature control, anti- cycle control, pump over-run, self-diagnostic fault indicator, continuous gas modulation. Low-water-content, copper heat exchanger. Electronic ignition with flame supervision. Integral high-head pump. Fan.

  • Page 5: Technical Data Page

    SECTION 2 TECHNICAL DATA 28 e 2.1 Performance Heat input 31 kW 37,8 kW Heat output (max) 28 kW 35,2 kW Heat output (min) 10,50 kW 9,22 kW Minimum working pressure 0,5 bar Maximum working pressure 3 bar Minimum flow rate 350 l/h 2.2 Gas pressure Inlet pressure (G20)

  • Page 6: General Requirements (Uk) Page

    Fig. 4 Location Minimum distance Below an opening (window, air-brik, etc.) 300 mm Above an opening (window, air-brik, etc.) 300 mm To the side of an opening (window, air-brik, etc.) 300 mm Below gutter, drain-pipe, etc. 75 mm Below eaves 200 mm Below balcony, car-port roof, etc.

  • Page 7: Gas Supply

    A compartment used to enclose the appliance Except where providing useful heat, pipes should must be designed and constructed specifically for be insulated to avoid heat loss and in particular to this purpose. An existing compartment/cupboard avoid the possibility of freezing. Particular atten- may be utilised provided that it is modified to suit.

  • Page 8: Electrical Supply

    3.11 INHIBITORS Vokera recommend that a 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. The inhibitor must be administered in strict accordance with the manufacturers* instructions.

  • Page 9: Gas Supply

    the provision of a safe and satisfactory flue and The following notes are for general guidance termination. The location must also permit an only. adequate air supply for combustion purposes 3A.6.1 PIPEWORK and an adequate space for servicing and air It is recommended that copper tubing be used in circulation around the appliance.

  • Page 10: Electrical Supply

    3A.11 INHIBITORS complete isolation from the supply. The preferred Vokera recommend that a inhibitor – suitable for method is by using a double-pole switch with a use with aluminium heat exchangers – is used to contact separation of at least 3 mm.

  • Page 11: Fitting The Flue

    7m+7m FITTING THE FLUE The top flue outlet permits both horizontal and vertical flue applications to be considered, alternatively, the Vokera twin flue system can be utilised if longer flue runs are required. 4.5.1 CONCENTRIC HORIZONTAL FLUE (For concentric vertical flue, see 4.5.2).
  • Page 12 FITTING STANDARD (2359029) EXTENDING THE HORIZONTAL FLUE HORIZONTAL FLUE KIT (see 4.4.1) If the horizontal flue requires extension/s or Carefully measure the distance from the centre additional bend/s, the horizontal flue terminal kit of the appliance flue outlet to the face of the (2359029) must be used.
  • Page 13 4.5.3 TWIN FLUE SYSTEM mark and cut a 105mm hole in the ceiling and/or The Vokera twin flue system enables greater flue roof. Fit the appropriate flashing plate to the roof distances to be achieved (see 4.4.2) than that of the standard concentric flue system.
  • Page 14 4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (see fig. 10) 4.5.3.3 HORIZONTAL TERMINATION (see fig. 12) Remove the flue restrictor ring from the The twin flue system must be converted to the appliance flue outlet (if fitted). dedicated concentric flue kit for termination. Insert the small restrictor ring (supplied with The horizontal terminal is supplied with a built- the twin adapter kit) if the total flue length -...

  • Page 15: Connecting The Gas & Water

    Push-fit the twin flue pipes onto the concentric to necessary to increase the size of the flow+return pipe work after the service value connections. twin converter ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter. 4.6.3 SAFETY VALVE (see fig.

  • Page 16: Gas Supply Installation

    Connect the supply cable wires (live & neutral) to their corresponding terminals on the appliance terminal block. Connect the EARTH wire to the EARTH block (see fig. 16) ensuring that it’s left slightly longer that the others, this will prevent strain on the earth wire should the cable become taut.

  • Page 17: Checking The Burner Pressure

    Show the user the location of the filling valve and products that have proved suitable for use with how to top-up the system pressure correctly, and Vokera appliances. Vokera Ltd. cannot show the location of all manual air release points. comment on the suitability of any other such product with our appliances.

  • Page 18: General

    5, after replacing any component. It is the law that any servicing work is carried out ALWAYS TEST FOR GAS SOUNDNESS IF by a competent person such as a Vokera engineer, ANY GAS CARRYING COMPONENTS HAVE an approved service agent, British Gas, or other BEEN REMOVED OR DISTURBED.

  • Page 19: Automatic Air Release Valve

    AUTOMATIC AIR RELEASE VALVE 6.12 PRINTED CIRCUIT BOARD (PCB) (see fig. 18) (AAV) Carry out component removal procedure as de- Carry out component removal procedure as de- scribed in 6.4. Located and remove the five scribed in 6.4. screws which secure the PCB cover & terminal Using a suitable pair of pump pliers, unscrew the cover, then remove cover, after carefully taking AAV from pump base.

  • Page 20: Flue Fan

    Disconnect the electrode lead from its connector 6.17 HEAT EXCHANGER (see fig. 24) at the rear of the boiler. Remove the retaining Carry out component removal procedure as de- screw for the burner thermostat and remove the scribed in 6.4. thermostat.
  • Page 21 6.19.2 EXPANSION VESSEL REMOVAL (with insuf- ficient clearance above) Carry out component removal procedure as de- scribed in 6.4. Disconnect the flue elbow or pipe from the appli- ance flue outlet. Unclip and remove the air cham- ber cover, gently pull the cover towards you before lifting and disengaging.

  • Page 22: Checks, Adjustments, And Fault Finding Page

    SECTION 7 CHECKS, ADJUSTMENTS, AND FAULT FINDING CHECKING APPLIANCE OPERATION (10mm) nut clockwise to increase, or counter- clockwise to decrease the burner pressure. When carrying out any repairs or servicing to the appliance, the relevant commissioning procedure NOTE must be undertaken to ensure the continued safe You should ensure that all radiators or heat operation of the appliance.

  • Page 23: Checking The Expansion Vessel

    be less than 1 ohm. If the resistance is greater than 1 ohm check all earth wires and connectors for continuity and integrity. 7.7.2 SHORT CIRCUIT CHECK Isolate the appliance from the electrical supply, and using a suitable multi-meter, carry out a short circuit test between the Live &...

  • Page 24: Fault Finding

    FAULT CODE 05 FAULT FINDING PCB fault. Before attempting any fault-finding, the electrical checks as detailed in 7.7 must be carried out. FAULT CODE 06 Isolate the appliance from the electrical supply. PCB fault (ensure JP5 is inserted) Disconnect any external controls from terminals 3 &...
  • Page 25 FAULT FINDING TEST ‘A’ (Mynute 28e-35e): turn the selector switch to the reset position START Status LED Status LED Status LED is blank is green is red Go to test "C" Does the Have the selector knob electrical rotate the checks as detailed in 7.7...
  • Page 26 Mynute...
  • Page 27 Mynute...
  • Page 28 FAULT FINDING TEST ‘D’ (Mynute 28e-35e): turn the selector to the “on” position START Does burner light Is there 230V between Does burner 1 & 2 of stay light ignition PCB Replace Is there ignition PCB Is spark 230V between...

  • Page 29: Wiring Diagrams Page

    If external controls are to be added to the system, they must be connected to the boiler as shown in the following diagrams. For advice on controls that are not featured in this book, please contact Vokera technical on 0141 24V room 945 6810. thermostat...
  • Page 30 Fig. 28 Mynute...
  • Page 31 Grey Orange Blue Green/Yellow Wiring centre 230V supply @ 50Hz Room thermostat Twin channel programmer Add if programmer has heating only position Cylinder thermostat Vokera twin-channel programmer Appliance terminal strip 3-Port mid-position valve Orange Grey White Blue Green/Yellow Wiring centre...
  • Page 32 FUNCTIONAL DIAGRAM 28e Fig. 30 R.T. Room thermostat (external controls) Timer on/off selector P.S. Water pressure switch Central heating temperature control P.D.S. Differential pressure switch Selection of 0-reset/ winter-summer H.L. High limit thermostat DS1-DS2 Temperature/alarm display S.R. Heat thermistor Combustion test Modulator Fuse 100mA F (on 24V circuit) Fuse 2 A F (on 230V circuit)
  • Page 33 FUNCTIONAL DIAGRAM 35e Fig. 31 Timer on- off selector Central heating temperature control R.T. Room thermostat (external controls) PT1(S.B.) Selection of 0-reset / winter - summer P.S. Water pressure switch DS1-DS2 Temperature / allarm display D.A.P.S.Differential analogue pressure switch Combustion test H.L.
  • Page 34 FUNCTIONAL DIAGRAM 28e Fig. 32 Mynute...
  • Page 35 FUNCTIONAL DIAGRAM 35e Fig. 33 Mynute...

  • Page 36: Exploded Diagrams Page

    SECTION 9 EXPLODED DIAGRAMS 16 17 POS. DESCRIPTION 28 E 35 E Frame R01005134 R01005212 Guard R1913 R1913 Quick primer pressure gauge R1857 R1857 2A fuse R8968 R8968 100mA fuse R1947 R1947 Printed Circuit Board cover R10021849 R10021849 Ignition module R10021848 R10021848 Printed Circuit Board...
  • Page 37 POS. DESCRIPTION 28 E 35 E Pressure switch R2044 R2044 Heating by-pass valve R1552 R1552 Heating distributor manifold R10021821 R10021821 Safety valve R1806 R1806 Pipe R10023065 R10023065 Heating cock R1789 R1789 Venting plugs kit R01005137 R01005137 Screw R6903 R6903 Ogive R1824 R1824 Wiring harness...
  • Page 38 35 E POS. DESCRIPTION 28 E 35 E Expansion vessel R2573 R2573 Flexible pipe R2164 R2164 Up 15-60 pump R10020438 R10020438 Wiring harness R1845 R1845 Pump pipe R1917 R10023209 Pipe R1847 R2051 Heat exchanger R2378 R10024580 Pipe R10021041 R10020519 Pipe R10022859 R10024754 Bracket...
  • Page 39 35 E 35 E POS. DESCRIPTION 28 E 35 E Air box bottom R2073 R10024792 Air box side R1549 NG Burner R5317 R10024752 LPG burner R5319 R10024753 Spark electrode R10022027 R10022027 Flame propagation baffle R2069 Burner plate R5172 Air box clip R0442 R0442 Gas pipe...
  • Page 40 35 E POS. DESCRIPTION 28 E 35 E Combustion chamber assembly R6028 R10024751 Rear panel R5316 R10020518 Lateral panel R5271 R5271 Front panel R5315 R10020517 Hood assembly R5907 R1968 R6492 R10024577 Fan to flue connector R10023183 R10023183 Clamp for 60 diam. tube R5916 R5916 Washer clamp...

  • Page 41: Technical Data

    SECTION 10 L.P.G. INSTRUCTIONS For details of converting boilers to LPG please refer to the instructions supplied with the relevant conversion kit. 10.1 TECHNICAL DATA Mynute Inlet pressure (LPG) 37 mbar 37 mbar Burner pressure maximum 36 mbar 36 mbar Burner pressure minimum 5,5 mbar 2,8 mbar...
  • Page 42 Mynute...
  • Page 43 Mynute...
  • Page 44 Vokèra Ltd. Floor, Catherine House, Boundary Way, Hemel Hempstead, Herts, HP2 7RP Email: enquiries@vokera.co.uk Web: www.vokera.co.uk Sales, Technical Advice, General Enquiries - Tel: 0870 333 0520 Fax: 01442 281403 After Sales Service - Tel: 0870 333 0220 Vokèra Ireland...

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Mynute 35e

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