VOKERA Mynute EHE Installation & Servicing Instructions Manual
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VOKERA Mynute EHE Installation & Servicing Instructions Manual

VOKERA Mynute EHE Installation & Servicing Instructions Manual

High efficiency system boiler
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Mynute EHE
High efficiency system 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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  • Page 1 Mynute EHE High efficiency system 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 Pre-operation checks Design principles and operating sequence Page Initial lighting Principle components Checking burner pressures and combustion analysis 14 Mode of operation (at rest) Final flushing of the heating system Mode of operation (heating) 5.8.1 Inhibtors Safety devices Setting the boiler operating temperature Technical data Page 5.10...
  • Page 3 - through 360 degrees for various horizontal or vertical appli- porates electronic ignition, circulating pump, expansion vessel, cations. The Mynute EHE range is approved for use with C12 & C32 safety valve, pressure gauge and automatic by-pass. type flue applications.

  • Page 4: Design Principles And Operating Sequence

    SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE Ignition is sensed by the electronic circuitry to ensure flame PRINCIPLE COMPONENTS stability at the burner. Once successful ignition has been A fully integrated electronic control board featuring elec- ● achieved, the electronic circuitry increases the gas rate to tronic temperature control, anti-cycle control, pump over- 75% for a period of 15 minutes.

  • Page 5: Technical Data

    SECTION 2 TECHNICAL DATA 29 EHE 35 EHE 25 EHE 2.1 Central heating Heat input (kW) 25.00 29.00 34.80 Maximum heat output@ 80/60 °C (kW) 24.35 28.30 33.93 Minimum heat output@ 80/60 °C (kW) 14.25 14.28 14.04 Maximum heat output@ 50/30 °C (kW) 25.90 29.93 36.05...

  • Page 6: Pump Duty

    2.10 PUMP DUTY Fig. 3 shows the flow rate available - after allowing for pressure loss through the appliance - for system requirements. When using this graph, apply only the pressure loss of the system. The graph is based on a 20 ºC temperature differential. Fig.

  • Page 7: Related Documents

    This appliance must be installed by a competent person in FLUE SYSTEM accordance with the Gas Safety (Installation & Use) Regu- The terminal should be located where the dispersal of lations. combustion products is not impeded and with due regard for the damage and discoloration that may occur to building RELATED DOCUMENTS products located nearby.

  • Page 8: Expansion Vessel

    Institute of Gas Engineers publication (IGE/UP/7) ‘Guide for Gas Installa- tions in Timber Frame Buildings’. 3.10 INHIBITORS Vokera recommend that an inhibitor - suitable for use with flow/return double check copper and aluminium heat exchangers - is used to protect pipe...

  • Page 9: General Requirements (Eire)

    Fig. 6 SECTION 3 GENERAL REQUIREMENTS (EIRE) This appliance must be installed by a competent person in 813 for detailed guidance on this aspect. A compartment accordance with and defined by the Standards Specifica- used to enclose the appliance must be designed and tion (Domestic Gas Installation) Declaration (I.S.

  • Page 10: Air Supply

    3A.10 INHIBITORS possibility of freezing. Particular attention should be paid Vokera recommend that an inhibitor - suitable for use with to pipes passing through ventilated areas such as under copper and aluminium heat exchangers - is used to protect floors, loft space and void areas.

  • Page 11: Installation

    (For twin flue applications, see 4.5.3). dimension Y (see fig 7A). Measure dimension Y from the The appliance can be used with either the Vokera con- terminal end of the concentric flue pipe and cut off the densing 60/100mm concentric flue system or the optional excess ensuring any burrs are removed.

  • Page 12: Concentric Vertical Flue

    CONCENTRIC VERTICAL FLUE Fit the appropriate flashing plate to the roof and insert the The appliance can be used with either the Vokera con- vertical flue terminal through the flashing plate from the densing 60/100mm concentric flue system or the optional outside, ensuring that the collar on the flue terminal fits over 80/125mm concentric flue system.

  • Page 13: Twin Flue System

    Remove the blanking plate (located to the right of the ● The Vokera twin flue system enables greater flue distances appliance flue outlet) and – using the same screws – to be achieved (see 4.4.2) than that of a concentric flue install the air inlet plate (B).

  • Page 14: Connecting The Gas And Water

    Push-fit the twin flue pipes onto the concentric to twin converter box ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter. If necessary cut the plain ends (male) of the twin flue pipes to allow connection to the concentric to twin converter.

  • Page 15: Condense Pipe

    thereby eliminating the possibility of freezing. The dis- charge pipe must terminate in a position where any water - possibly boiling - discharges safely without causing damage or injury, but is still visible. 4.6.4 CONDENSE PIPE During normal operation the boiler produces condense which is collected in a trap located in the lower part of the boiler.

  • Page 16: Commissioning

    SECTION 5 COMMISSIONING GAS SUPPLY INSTALLATION or the appliance has been converted for use with another Inspect the entire installation including the gas meter, test gas type, then it becomes necessary to carry out a combus- for soundness and purge. Refer to BS 6891 for specific tion analysis/check to ensure that correct combustion is instruction.

  • Page 17: Instructing The User

    It is the law that any servicing work is carried out by a Carry out component removal procedure as described in competent person such as a Vokera engineer, an ap- 6.4. proved service agent, Bord Gais (ROI), British Gas, CORGI...

  • Page 18: Automatic Air Release Valve

    NOTE Ensure that any replacement PCB has the correct jumper tag configuration, and that the relevant gas pressures are correctly set/adjusted (see 7.8.1). 6.13 GAS VALVE (fig. 22) Carry out component removal procedure as described in 6.4. The gas valve must be changed as complete unit. Disconnect the electrical plug and leads from the gas valve.

  • Page 19: Flue Fan

    Fig. 23 Fig. 24 Fig. 25 6.16 FLUE FAN (fig. 25) Carry out component removal procedure as described in 6.4. Fig. 26 Unclip and remove the air chamber cover, gently pull the cover towards you before lifting and disengaging. Locate and remove the six screws that secure the front combustion cover, then remove the cover.

  • Page 20: Expansion Vessel Removal (With Sufficient Clearance Above)

    6.20.1 EXPANSION VESSEL REMOVAL (with sufficient 6.21.2 DISMANTLING THE LATENT HEAT COLLECTOR clearance above) Apart from routine servicing or maintenance of the retarder and coil, the latent heat collector is a non-serviceable Carry out component removal procedure as described in 6.4. component, therefore, there is no requirement to dis- Disconnect the flue from the appliance.

  • Page 21: Checks, Adjustments And Fault Finding

    SECTION 7 CHECKS, ADJUSTMENTS AND FAULT FINDING CHECKING APPLIANCE OPERATION When carrying out any repairs or servicing to the appliance, the relevant commissioning procedure must be under- taken to ensure the continued safe operation of the appli- ance. Particular attention should be made to ensure gas soundness, water soundness, and the electrical integrity of the appliance.

  • Page 22: Checking & Adjusting Burner Pressure

    modulating coil. Compare the reading on the manometer SARA sector with the value described in 2.3. If adjustment is required, turn the inner (red) crosshead screw clockwise to increase, or counter-clockwise to decrease the burner pressure, whilst ensuring that the outer (10mm) nut does not move. When checking and/or adjustment has been completed, isolate the appliance from the electrical supply, replace the protective cap, refit the grey wire to the modulating coil,...

  • Page 23: External Faults

    EFFECT OF JUMPER TAGS FITTED TO THE MAIN PCB a suitable multi-meter, carry out a resistance test. Connect test leads between an appliance earth point and the earth JP1 - required for Mynute EHE System boiler ● wire of the appliance supply cable. The resistance should JP2 - cancels anti-cycle function and initial heating ●...
  • Page 24 YELLOW LED RED LED Frequency Faults/Status Frequency Faults/Status On every 0.5-secs CO function active On every 0.5-secs Final fault, e.g.: water pressure switch Solid Internal fault ● ● ● ● ● condense pressure switch ● ● ● ● ● fan/flue problem ●...

  • Page 25: Fault Finding

    7.10.2 FAULT FINDING TEST ‘A’ SPARK AT ELECTRODE THERE 24 Vdc BETWEEN TERMINALS CN8.4 & CN8.5 ON PCB IGNITION THERE 230 Vac BETWEEN TERMINALS CN6.1 & CN6.2 ON PCB CHECK AND/OR REPLACE PCB LOCKOUT AFTER IGNITION THERE 24 Vdc BETWEEN TERMINALS CHECK CN8.4 &...
  • Page 26 7.10.3 FAULT FINDING TEST ‘A1’ RED LED BLINKS RED LED LIGHT REPLACE CONTROL BOARD YELLOW LIGHT SWITCH ON/OFF CHECK CH NTC YELLOW LED SELECTOR ON OFF SENSOR OR WIRING BLINKS POSITION AND CONNECTIONS CHIMNEY SWEEPER CYCLE. RESET AND RESTART TEST MAINS SWITCH ON/OFF PRESENT BETWEEN...
  • Page 27 7.10.4 FAULT FINDING TEST ‘C’: CHECK CONTROL IN CH MODE START SWITCH ON BOILER AND SELECT MODE TO WINTER C/H THERMOSTAT AT MAX. LINK BOTH BLACK WIRES (TERMINALS 1 & 3) AT THE APPLIANCE TERMINAL STRIP DOES BURNER LIGHT CHECK BOILER STARTUP TEST A VOLTAGE ACROSS TERMINALS OF...
  • Page 28 7.10.6 TEST ‘C’ CONT’D WAIT WATER FLOW TEMPERATURE BURNER AND FAN >40 °C SWITCH OFF SWITCH CH THERMOSTAT AT MAX. WATER FLOW TEMPERATURE >40 °C REPLACE CONTROL BOARD BURNER AND FAN SWITCH ON TIMER JUMPER REMOVE JUMPER REPLACE WAIT 3 MIN. CONTROL BOARD RESTART THE TEST...

  • Page 29: Wiring Diagrams

    SECTION 8 WIRING DIAGRAMS EXTERNAL WIRING The appliance comes with a factory fitted link-wire to allow basic operation of the boiler (fig. 40). 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 the technical help-line for detailed advice and guidance on 0844 391 0987.

  • Page 30: Integral Clock

    INTEGRAL CLOCK OTHER CONTROLS Contact the controls manufacturer and/or the technical help line should you require more specific information Integral or external clock on the suitability of a particular control. Further guidance on the recommended practice for the installation of external controls, can be found in CHeSS - HC5/HC6 (www.energy-efficiency.gov.uk).

  • Page 31: Functional Diagram

    FUNCTIONAL DIAGRAM NOTE: L-N-E CONNECTION IS ADVISABLE Fig. 40...

  • Page 32: Exploded Diagrams

    SECTION 9 EXPLODED DIAGRAMS POS. DESCRIPTION MYNUTE 25 EHE MYNUTE 29 EHE MYNUTE 35 EHE Frame assembly R01005403 R01005406 R01005410 Water gauge carrier R10029105 R10029105 R10029105 Pressure gauge R10029421 R10029421 R10029421 Cover R10024976 R10024976 R10024976 Printed circuit board CPBTR04 R10030505 R10030505 R10030505 Led light guide...
  • Page 33 POS. DESCRIPTION MYNUTE 25 EHE MYNUTE 29 EHE MYNUTE 35 EHE R2726 R2726 R2726 By-pass casing R10024641 R10024641 R10024641 Heating by-pass valve R2047 R2047 R2047 Heating manifold and cartridge R10027768 R10027768 R10027768 3 way valve cartridge R10025305 R10025305 R10025305 Clip R10025450 R10025450 R10025450...
  • Page 34 POS. DESCRIPTION MYNUTE 25 EHE MYNUTE 29 EHE MYNUTE 35 EHE Expansion vessel R2204 R2573 R2573 Pipe R10025188 R10025188 R10025188 Pump R10027571 R10027571 R10027571 Pipe R10027541 R10027566 R10027741 Pipe R10024312 R10024130 R10024519 Exchanger R2381 R2378 R10020513 Pipe R10021041 R10021041 R10020519 Pipe R10027542 R10027567...
  • Page 35 POS. DESCRIPTION MYNUTE 25 EHE MYNUTE 29 EHE MYNUTE 35 EHE Roomsealed chamber R10027533 R10027562 R10028011 Roomsealed chamber side R10024166 R10024166 R2059 N.G. burner R10027536 R10027564 R10028013 Spark / ignition electrode R10025985 R10025985 R10025985 Plate R5172 R5172 R5172 Gas valve solenoid R10020838 R10020838 R10020838...
  • Page 36 POS. DESCRIPTION MYNUTE 25 EHE MYNUTE 29 EHE MYNUTE 35 EHE Combustion chamber assembly R10025935 R10026406 R10020514 Back insulatin panel R5270 R5316 R10020518 Protection R5271 R5271 R5271 Combustion chamber insulation panel R5269 R5315 R10020517 Flue draught diverter R10024310 R10024125 R10024473 R10024035 R10024035 R10024035...

  • Page 37: Instructions

    SECTION 10 L.P.G. INSTRUCTIONS 10.1 RELATED DOCUMENTS BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 5440 PART 1 FLUES BS 5482 PART 1...
  • Page 38 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 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...

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