Riello Vokera Mynute 20 VHE Installation & Servicing Instructions Manual
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Riello Vokera Mynute 20 VHE Installation & Servicing Instructions Manual

High efficiency open vent boiler
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Mynute VHE
High efficiency open vent boiler
Installation
& Servicing
Instructions
G.C. N° 41 094 70
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 Riello Vokera Mynute 20 VHE

  • Page 1 Mynute VHE High efficiency open vent boiler Installation & Servicing Instructions G.C. N° 41 094 70 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 Design principles & operating sequence Page Gas valve 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 INTRODUCTION The Mynute VHE is a high-efficiency boiler for open The Mynute VHE is approved for use with C13 & C33 vent system. type flue appliacations Mynute VHE boiler complies with basic requirements These appliances – by design – incorporate premix of the following Directives: combustion and a radial aluminium heat exchanger.
  • Page 4 2-digit LED TEMPERATURE SELECTOR GREEN LED RED LED 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 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...

  • Page 5: Principle Components

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

  • Page 6: Central Heating

    SECTION 2 TECHNICAL DATA 2.1 Central Heating Mynute 20 VHE Heat input (kW) 20.00 Maximum heat output (kW) 60/80°C 19.52 Minimum heat output (kW) 60/80°C 4.83 Maximum heat output (kW) 30/50°C 20.80 Minimum heat output (kW) 30/50°C 5.35 Minimum working pressure 0.1 bar Maximum working pressure 3.0 bar...
  • Page 7 Seasonal space heating energy efficiency Water heating energy efficiency class class Parameter Symbol Value Unit Parameter Symbol Value Unit Seasonal space heating energy Rated heat output Prated ηs efficiency For boiler space heaters and boiler combination heaters: For boiler space heaters and boiler combination heaters: useful heat output useful efficiency At rated heat output and high-...

  • Page 8: Related Documents

    SECTION 3 GENERAL REQUIREMENTS (UK) BS 5440 PART 1 FLUES BS 5440 PART 2 FLUES & VENTILATION BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW BS 6891 LOW PRESSURE INSTALLATION PIPES This appliance must be installed by a competent per- An existing compartment/cupboard may be utilised son in accordance with the Gas Safety (Installation &...

  • Page 9: Electrical Supply

    3.11.1 FEED & VENT PIPEWORK Except where providing useful heat, pipes should be The feed and vent pipe work from the boiler to the insulated to avoid heat loss and in particular to avoid F&E (Feed & Expansion) tank should be configured as the possibility of freezing.
  • Page 10 3.11.2 ALTERNATIVE CLOSE-COUPLED ARRANGEMENT If necessary or if preferred, a close-coupled arrangement for the feed and expansion pipe work can be used as an alternative to a combined feed and vent pipe. The configuration of the close-coupled pipe work shall be as shown in figure 4B.

  • Page 11: Related Documents

    SECTION 3A GENERAL REQUIREMENTS (EIRE) must be ensured that an adequate supply is main- ATTENTION tained to each appliance when they are in use at the The use of PPE (Personal Protective Equipment) such same time. as but not limited to gloves, mask, safety glasses, etc. is strongly recommended whenever carrying out the 3A.4 FLUE SYSTEM installation, repair, or maintenance of this appliance –...

  • Page 12: Electrical Supply

    3A.7 ELECTRICAL SUPPLY 3A.11.1 FEED AND VENT PIPEWORK The feed and vent pipe work from the boiler to the The appliance is supplied for operation on 230V @ F&E (Feed & Expansion) tank should be configured 50Hz electrical supply; it must be protected with a as shown in figure 4A using a 22mm combined feed 3-amp fuse.

  • Page 13: Delivery

    SECTION 4 INSTALLATION NOTE 4.5 FITTING THE FLUE Please refer to Section 3, Para 3.1 and use the ap- The top flue outlet permits both horizontal and vertical propriate PPE when carrying out any of the actions or flue applications to be considered, alternatively, the procedures contained within this section.
  • Page 14 Measure dimension Y from the terminal end of the The flue system should have a minimum of 1º; maxi- concentric flue pipe and cut off the excess ensuring mum of 3º rise from the boiler to outside, to ensure any any burrs are removed.
  • Page 15 system to drain via the condensate drain. Considera- Using the dimensions given in fig. 9 as a reference, tion must also be given to the fact that there is the mark and cut a 115mm hole in the ceiling and/or roof. possibility of a small amount of condensate dripping from the terminal.
  • Page 16 If necessary cut the plain ends (male) of the twin flue Fig. 10 pipes to allow connection to the concentric to twin converter. NOTE • Before cutting twin flue pipes ensure allowances have been made for connection onto the previous piece and onto the concentric to twin converter.

  • Page 17: Connecting The Gas & Water

    • Remove the 2 screws (B) located at the Left & Right 4.6 CONNECTING THE GAS AND WATER of the underside of the casing. The appliance is supplied with a 15mm service valve for • Lift the casing upward to disengage it from the top the gas connection and 22mm copper to brass adapters locating hooks and then remove.

  • Page 18: Gas Supply Installation

    4.7.4 CONNECTING THE PUMP (230V) OUTPUT (fig. 16) Pass the pump cable through the cable anchorage point. Connect the pump cable wires (LIVE, NEUTRAL, & EARTH) to their corresponding terminals (L, N, & E) on the appliance terminal block. When connecting the EARTH wire, ensure that it’s left slightly longer that the others, this will prevent strain on the EARTH wire should the cable become taut.

  • Page 19: Pre-Operation Checks

    5.5 PRE-OPERATION CHECKS 5.8.1 INHIBITORS Before attempting the initial lighting of the appliance, See Section 3 “General Requirements”. the following checks must be carried out: 5.9 SETTING THE BOILER OPERATING TEMPERA- • Ensure all gas service valves from the meter to the TURE appliance are open and the supply pipe has been The flow outlet temperature can be adjusted between...

  • Page 20: General

    SECTION 6 SERVICING INSTRUCTIONS ALWAYS TEST FOR GAS SOUNDNESS IF ANY GAS NOTE CARRYING COMPONENTS HAVE BEEN REMOVED OR Please refer to Section 3, Para 3.1 and use the ap- DISTURBED. propriate PPE when carrying out any of the actions or procedures contained within this section.

  • Page 21: Gas Valve

    Ensure that the correct jumper tag configuration has been nozzle respected. It will be necessary to check the functioning of the PCB is set for the correct boiler type/application. 6.9 GAS VALVE (fig. 21) Carry out component removal procedure as described in 6.4.

  • Page 22: Burner

    6.13 BURNER (fig. 24) Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber front and the RH side covers. Slacken the nut (A) of the gas pipe. Unscrew the 2 fixing screws (B). Slacken the M4 screw (C) and rotate anticlockwise the sheet metal protection fan.

  • Page 23: Checks, Adjustments And Fault Finding Page

    SECTION 7 CHECKS, ADJUSTMENTS AND FAULT FINDING NOTE cycle is activated. The pump will be activated for a Please refer to Section 3, Para 3.1 and use the ap- period of 30-seconds. propriate PPE when carrying out any of the actions or •...

  • Page 24: Checking The Co 2 & Adjusting The Valve

    7.3.1 CHECKING/ADJUSTING THE APPLIANCE FAN • Using a suitable screwdriver, very slowly turn the SPEEDS maximum adjustment screw (see fig. 30) – clockwise to decrease, counter clockwise to increase – until the Move the selector switch to the OFF position and remove correct value is displayed on the CO analyser (allow the 3-selector knobs.

  • Page 25: Electrical Checks

    7.6.1 INSTALLATION FAULTS 7.7.5 RESISTANCE TO EARTH CHECK Isolate the appliance from the electrical supply, and using Symptom Possible cause a suitable multi-meter carry out a resistance test. Connect No display/igni- Check wiring/check electrical supply test leads between the Live & Earth connections at the tion appliance terminal strip (fig.

  • Page 26: External Wiring

    CODE CAUSE ALARM TYPE ACTION AL28 Temperature differential inverted (re- Final Reset, check pump, ensure there is suffi- turn sensor temperature higher than cient circulation around heating circuit/s flowsensor temperature) thermistors AL34 Fan tacho signal fault / air pressure Final Reset check appliance operation, check switch fault AL52...
  • Page 27 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. AD02A GAR Main PCB F.O.H.T Flow over heat thermostat F Hv Fan power supply 230 V Fumes thermostat F Lv Fan signal control Cable connector...
  • Page 28 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 29: Related Documents

    SECTION 9 LPG INSTRUCTIONS NOTE Please refer to Section 3, Para 3.1 and use the appropriate PPE when carrying out any of the actions or pro- cedures contained within this section. 9.1 RELATED DOCUMENTS BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60 kW BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS...

  • Page 30: Appliance Fan Speeds

    9.6.4 COMPLETION On completion of the combustion analysis check and/ or any gas valve adjustment, set the HTG trimmer to the corresponding value as detailed in the fan speed table. Refit the 3-selector knobs and move the mode selector to the OFF position. Remove the test probe from the test point and refit the sealing screw/s and/ or cap.

  • Page 31: Commissioning Checklist

    COMMISSIONING: CO AND COMBUSTION RATIO CHECK BEFORE CO AND COMBUSTION RATIO CHECK NOTE The boiler installa on instruc ons should have been followed, The air/gas ra o valve is factory-set and gas type verified and gas supply pressure/rate checked as must not be adjusted during commissioning required prior to commissioning.

  • Page 32: Benchmark

    Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturers’ To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation. The warranty rests with the end-user (consumer), and they should be made aware it is ultimately their responsibility to register with the manufacturer, within the allotted time period.
  • Page 33 GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Time, temperature control and boiler interlock provided for central heating and hot water Boiler Plus requirements (tick the appropriate box(s)) Weather compensation...
  • Page 34 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
  • Page 35 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
  • Page 36 Vokèra Warranty Terms and Conditions Vokèra Ltd offer customers the comfort of a parts and labour warranty repair service subject to the following terms and conditions. Vokèra Ltd only obligation under the guarantee shall be to repair or replace the faulty appliance at Vokèra Ltd discretion.
  • Page 37 d. To de-scaling or other work required as a result of hard water scale deposits or from damage caused by aggressive water or sludge resulting from corrosion. Indications that such work may be required include a noisy boiler, cold spots on radiators, sludge in pipes and poor circulation of the central heating system. e.
  • Page 38 Registered address: Vokèra Ltd Borderlake House Unit 7 Riverside Industrial Estate London Colney Herts AL2 1HG 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 specification without prior notice Consumers statutory rights are not affected.

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