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Mynute i
High efficiency system boiler
Users Instructions
Installation &
Servicing
Instructions
Mynute i20 G.C. N. 41-094-81
Mynute i25 G.C. N. 41-094-96
Mynute i30 G.C. N. 41-094-82
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 i20
- Page 1 Mynute i High efficiency system boiler Users Instructions Installation & Servicing Instructions Mynute i20 G.C. N. 41-094-81 Mynute i25 G.C. N. 41-094-96 Mynute i30 G.C. N. 41-094-82 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 2: Table Of Contents
1. THINGS YOU SHOULD KNOW ........... 1 SECTION 4 - INSTALLATION ............15 1.1 GAS APPLIANCES..............1 4.1 DELIVERY ................15 1.2 ELECTRICAL SUPPLY ............... 1 4.2 CONTENTS ................15 1.3 GUARANTEE REGISTRATION CARD ........1 4.3 UNPACKING ................15 1.4 APPLIANCE COMMISSIONING CHECKLIST (UK only) ... -
Page 3: Things You Should Know
USERS INSTRUCTIONS INTRODUCTION Dear Customer Your Vokèra Mynute i boiler has been designed to meet and exceed the very latest standards in gas central heating technology, and if cared for, will give years of reliable use and efficiency. Please therefore take some time to read these instructions carefully. Do’s and Don’t’s - Do ensure that the system pressure is periodically checked - Do ensure that the boiler should not be used by children or unassisted disabled people... - Page 4 Fig. 1 MODE SELECTOR SWITCH HEATING TEMPERATURE SELECTOR DISPLAY PRESSURE GAUGE PRESSURE GAUGE Ensure the system pressure is set correctly (minimum 0.5-bar) MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR Mode selector switch: Heating & hot water - Select this position when you want the boiler to re- spond to a heating and hot water request from the time-clock programmer SARA function...
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Page 5: Getting Started
DIGITAL DISPLAY Symbol/Icon Description Displayed when heating mode is active Displayed when frost protection function is ac- tive Displayed if an alarm or fault has been detected Displayed when low system pressure has been detected Displayed when an external sensor is connected to the boiler Flame on Displayed if an ignition fault has been detected... -
Page 6: How To
3. HOW TO... 4. WHAT IF... 3.1 HOW TO TOP-UP THE SYSTEM PRESSURE 4.1 WHAT IF I SUSPECT A GAS LEAK (fig. 1-2) If you suspect a gas leak, turn off the gas supply at the gas meter and contact your installer or local gas supplier. If you The system pressure must be checked periodically to ensure the require further advice please contact your nearest Vokèra office. - Page 7 FAULT CODES ALARM CODE CAUSE ALARM TYPE ACTION AUTOSTOP Final Call engineer CALL FOR SERVICE Temporary then final Call engineer Ignition failure, flame not sensed, Final Reset, check appliance operation internal fault Limit thermostat fault Final Reset, check appliance operation Fan tacho signal fault Final Reset check appliance operation, check fan...
- Page 8 INSTALLATION AND SERVICING INSTRUCTIONS INTRODUCTION All installers are asked to follow the Benchmark Scheme by When the product reaches the end of its life it should not be adhering to the Code of Practise, which can be obtained from disposed of as solid urban waste but should be brought to a www.centralheating.co.uk.
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Page 9: Section 1 - Design Principles And Operating Sequence
SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.1 PRINCIPLE COMPONENTS • A fully integrated electronic control board featuring electronic temperature control, anti-cycle control, pump over-run, self- diagnostic fault indicator, full air/gas modulation • Aluminium heat exchanger • Electronic ignition with flame supervision •... -
Page 10: Section 2 - Technical Data
SECTION 2 - TECHNICAL DATA 2.1 Central Heating Mynute i20 Mynute i25 Mynute i30 Heat input (kW) 20.00 25,00 30.00 Maximum heat output (kW) 60/80°C 19.52 24,58 29.25 Minimum heat output (kW) 60/80°C 1.97 3.90 3,16 4,45 2.93 4.37 Maximum heat output (kW) 30/50°C 21.08 26,70 31.62... - Page 11 Mynute i20 Seasonal space heating energy efficiency class Water heating energy efficiency class Parameter Symbol Value Unit Parameter Symbol Value Unit Seasonal space heating Rated heat output Prated ηs energy efficiency For boiler space heaters and boiler combination For boiler space heaters and boiler combination heaters: useful heat output heaters: useful efficiency At rated heat output and high-...
- Page 12 Mynute i30 Seasonal space heating energy efficiency class Water heating energy efficiency class Parameter Symbol Value Unit Parameter Symbol Value Unit Seasonal space heating Rated heat output Prated ηs energy efficiency For boiler space heaters and boiler combination For boiler space heaters and boiler combination heaters: useful heat output heaters: useful efficiency At rated heat output and high-...
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Page 13: Pump Duty
2.12 PUMP DUTY Fig. 6 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. 1000 1100 1200 Fig. 5 Flow rate (l/h) Fig. -
Page 14: Section 3 - General Requirements (Uk)
SECTION 3 - GENERAL REQUIREMENTS (UK) 3.5 AIR SUPPLY This appliance must be installed by a competent person in ac- cordance with the Gas Safety (Installation & Use) Regulations. The following notes are intended for general guidance only. 3.1 RELATED DOCUMENTS This appliance is a room-sealed, fan-flued boiler, consequently it does not require a permanent air vent for combustion air sup- The installation of this boiler must be in accordance with the... -
Page 15: Electrical Supply
3.7 ELECTRICAL SUPPLY The appliance is supplied for operation on 230V @ 50Hz electri- cal supply; it must be protected with a 3-amp fuse. The method control valve of connection to the mains electricity supply must allow for control complete isolation from the supply. The preferred method is by temporary valve connection... -
Page 16: Air Supply
3A.7 ELECTRICAL SUPPLY If installed less than 2m above a pavement or platform to which people have access (including balconies or flat roofs) The appliance is supplied for operation on 230V @ 50Hz electri- the terminal must be protected by a guard of durable material. cal supply;... -
Page 17: Section 4 - Installation
SECTION 4 - INSTALLATION 4.1 DELIVERY 29450125 500mm extension 500mm Due to the weight of the appliance it may be necessary for 29450126 1000mm extension 1000mm two people to lift and attach the appliance to its mounting. The 29450127 2000m extension 2000mm appliance is contained within a heavy-duty cardboard carton. - Page 18 Attach the rear flue terminal to the appliance (using the pre- viously retained screws) and fix the telescopic terminal to the correct length (wall thickness) ensuring that the terminal will protrude through the wall by the correct distance. At this point, lift the appliance and carefully insert the terminal into and through the wall, ensuring that the holes in the appliance back frame are aligned with the studs on the wall bracket.
- Page 19 4.5.2 CONCENTRIC VERTICAL FLUE IMPORTANT The appliance can be used with either the Vokèra condensing The vertical flue terminal is 1.0 metre in length and cannot be 60/100mm concentric flue system or the optional 80/125mm cut; therefore it may be necessary to adjust the height of the concentric flue system.
- Page 20 INSTALLATION OF TWIN ADAPTOR KIT (fig. 18 & 19) NOTE • Insert the exhaust connection manifold (A) onto the appliance Seal the flue terminal assembly to the wall using cement or a flue outlet. suitable alternative that will provide satisfactory weatherproof- •...
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Page 21: Connecting The Gas And Water
4.6 CONNECTING THE GAS AND WATER • brown wire to LIVE supply • blue wire to NEUTRAL supply The appliance is supplied with an accessory pack that includes • green/yellow to EARTH connection. service valves, sealing washers’ etc, for use with the service Insert the supplied 3-AMP fuse into the fused isolator or fused plug. -
Page 22: Section 5 - Commissioning
SECTION 5 - COMMISSIONING 5.1 GAS SUPPLY INSTALLATION analysis check to ensure that correct combustion is occurring. If there are no means to carry out a combustion analysis Inspect the entire installation including the gas meter, test for check, then it will not be possible to complete the commissio- tightness and purge. -
Page 23: Instructing The User
5.13 INSTRUCTING THE USER IMPORTANT To validate the appliance warranty, it’s necessary to register Hand over all documentation supplied with this appliance – the appliance details with us. The warranty can be registered including these instructions – and explain the importance of in several ways: keeping them in a safe place. -
Page 24: Water Pressure Switch
6.6.1 TOP AUTOMATIC AIR RELEASE VALVE (fig. 28) Carry out component removal procedure as described in 6.3. Unclip and remove the air chamber front cover. Remove the AAV locking pin (M) from the deaerator assembly and remove the AAV assembly (N). Replace in the reverse order. 6.7 WATER PRESSURE SWITCH (fig. -
Page 25: Gas Valve
6.11 GAS VALVE (fig. 31) Carry out component removal procedure as described in 6.3. The gas valve must be changed as complete unit. Disconnect the electrical plug and leads from the gas valve, slacken and unscrew gas valve inlet and outlet connections. Please note, the sealing washers (R) must be discarded and replaced with new sealing washers. -
Page 26: Main Heat Exchanger
6.15 MAIN HEAT EXCHANGER (fig. 34) Carry out component removal procedure as described in 6.3. Unclip and remove the three air chamber covers (front, LH, RH sides). Disconnect all the wiring connections. Fig. 36: Slacken the gas pipe (L1) at the air box connection and swing/rotate of the fan assembly. -
Page 27: Flue Collector Removal
6.19 FLUE COLLECTOR REMOVAL (fig. 38) Carry out component removal procedure as described in 6.3. Locate and remove the screw (A2) that secures the flue gas analysis test point cover (B2). Remove the clip and the fumes thermostat (C2). Locate and remove the screws (D2) that se- cure the flue collector to the combustion chamber Gently pull forward and ease the flue collector from its location. -
Page 28: Section 7 - Checks, Adjustments And Fault Finding
SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING 7.1 CHECKING APPLIANCE OPERATION NOTE If the spark/sensing electrode does not sense ignition the appli- When carrying out any repairs or servicing to the appliance, ance will re-attempt ignition a further 4-times then go to lockout. the relevant commissioning procedure must be undertaken to When the set-point has been reached (the position of the heating ensure the continued safe operation of the appliance. -
Page 29: Checking The Co And Adjusting The Gas Valve
7.3 CHECKING THE CO AND ADJUSTING THE GAS VALVE THE GAS VALVE MUST BE SET-UP OR ADJUSTED WITH THE AID OF A PROPERLY CALIBRATED FLUE GAS ANALYSER. Isolate the appliance from the electrical supply and remove the appliance casing as described in 4.7.1, to gain access to the printed circuit board, locate and open the closing plug on the dash board (L2), Restore the electrical supply to the boiler and switch the boiler to the OFF mode. -
Page 30: External Faults
7.8 FAULT FINDING 7.6 EXTERNAL FAULTS Before carrying out any faultfinding or component replacement, Before attempting any faultfinding, the electrical checks as ensure the fault is not attributable to any aspect of the installation. detailed in 7.7 must be carried out. Isolate the appliance from the electrical supply. -
Page 31: Adjustments
7.10 ADJUSTMENTS - Press the “combustion analysis” button a second time to The boiler has already been adjusted by the manufacturer reach the number of rotations corresponding to the maxi- during production. If the adjustments need to be made again, mum domestic hot water output (table 1) for example after extraordinary maintenance, replacement of - Check the CO... - Page 32 The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional flue gas emission limits it is, however, possible to modify this value, referring to the graphs below. Mynute i20 HTG curve (Qnheating) COs.a.
- Page 33 7.10.1 CHECKING THE FAN SPEED REFERENCE REFERENCE Locate the CO button (see Fig 40 pos SW1). TEMPERATURE 20 °C TEMPERATURE 15 °C Select the main selector switch to the ON position, press the CO button once, the display will then scroll through the fan speeds along with the relevant icon.
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Page 34: Section 8 - Wiring Diagrams
SECTION 8 - WIRING DIAGRAMS 8.1 EXTERNAL WIRING 8.3 OTHER DEVICES External controls must to be added to the system and they Contact the controls manufacturer and/or Vokera technical must be connected to the appliance as shown in the following department should you require more specific information on diagrams. - Page 35 FUNCTIONAL DIAGRAM Fig. 45...
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Page 36: Section 9 - Lpg Instructions
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 37: Commissioning Checklist
COMMISSIONING: CO AND COMBUSTION RATIO CHECK BEFORE CO AND COMBUSTION RATIO CHECK NOTE The installation instructions should have been followed, gas type verified and gas supply pressure/rate checked as required The air/gas ratio valve is factory-set and must not be prior to commissioning. -
Page 38: Benchmark
Benchmark Commissioning and Servicing Section It is a requirement that the boiler is installed and commissioned to the manufacturers instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler guarantee the boiler needs to be registered with the manufacturer within one month of the installation. - Page 39 GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failuretoinstallandcommissionaccordingtothemanufacturer’sinstructionsandcompletethisBenchmarkCommissioningChecklistwillinvalidatethe warranty.Thisdoesnotaffectthecustomer’sstatutoryrights.
- Page 40 SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider BeforecompletingtheappropriateServiceRecordbelow,pleaseensureyouhavecarriedouttheserviceasdescribedinthemanufacturer’sinstructions. Alwaysusethemanufacturer’sspecifiedsparepartwhenreplacingcontrols. SERVICE 01 SERVICE 02 Date: Date: Engineername: Engineername: Companyname: Companyname: TelephoneNo: TelephoneNo: GassaferegisterNo: GassaferegisterNo: Atmax.rate: COppm AND CO ²...
- Page 44 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 specification without prior notice...
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