VOKERA Mynute 25 A User Instructions Download

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Users Instructions

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.

Mynute 25 A

High efficiency system boiler

Summary of Contents for Mynute 25 A

Page 1: ...tions 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 Mynute 25 A High efficiency system boiler ...

Page 2: ... 3A 9 Timber framed buildings 11 3A 10 Inhibitors 11 3A 11 Showers 11 3A 12 Declaration of conformity 11 Installation Page 4 1 Delivery 12 4 2 Contents 12 4 3 Unpacking 12 4 4 Preparation for mounting the appliance 12 4 5 Fitting the flue 12 4 6 Connecting the gas water 15 4 7 Electrical connections 16 Commissioning Page 5 1 Gas supply installation 17 5 2 The heating system 17 5 3 Initial filling ...

Page 3: ...te 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 peop...

Page 4: ...e reset Heating hot water Select this position when you want the boiler to respond to a heating and hot water request from the time clock programmer Heating temperature selector move the selector clockwise to increase the heating outlet temperature or counter clockwise to reduce the temperature range 40 C 80 C for standard central heating The automatic temperature control function SARA is set with...

Page 5: ... for simplicity of use it utilises the latest in boiler technology enabling a host of functions to be carried out simultaneously 2 6 AUTOMATIC TEMPERATURE CONTROL The automatic temperature control function SARA permits the boiler when the heating temperature selector is set within 4 and 6 sector to automatically adjust raise the heating The activation and the disable of the function is visualized ...

Page 6: ...m pressure reset check Call engineer if fault re occurs Alarm safety shutdown and or Final ON OFF OFF Reset appliance Call internal fault engineer if fault re occurs Temporary fault Temporary OFF OFF BLINKING None Service operation NA OFF BLINKING OFF None Flame ON NA OFF OFF ON None Fault sensors Final BLINKING OFF BLINKING Reset appliance Call engineer if fault re occurs Boiler stand by NA OFF O...

Page 7: ...ith a sealed system only consequently they are not intended for use on open vented systems This booklet is an integral part of the appliance It is therefore necessary to ensure that the booklet is handed to the person responsible for the property in which the appliance is located installed A replacement copy can be obtained from Vokèra customer services Fig 4 General layout 1 Drain valve 2 Safety ...

Page 8: ...by the electronic circuit to ensure flame stability at the burner Once successful ignition has been achieved the electronic circuitry increases the gas rate to 75 for a period of 15 minutes Thereafter the boiler s output will either be increase to maximum or modulate to suit the set requirement When the appliance reaches the desired tem perature the burner will shut down and the boiler will perfor...

Page 9: ...casing or 25mm above flue elbow whichever is applicable Bottom 150mm Front 500mm 2 6 Connections Flow return 22mm Gas 15mm Safety valve 15mm Condense 21mm 2 7 Electrical Power consumption Watts 140W Voltage V Hz 230 50 Internal fuse 3 15A T for PCB 3 15A F for connections block External fuse 3A 2 8 Flue Details concentric Maximum horizontal flue length 60 100mm 4 0m Maximum vertical flue length 60...

Page 10: ...o the side of the vertical terminal 300 mm Q From the top of the vertical terminal to the roof flashing As determined by the fixed collar of the vertical terminal R To the side of a boundary 300 mm S To the side of an opening or window on a pitched roof 600 mm T Below an opening or window on a pitched roof 2000 mm V From a vertical terminal to an adjacent opening window air brick etc call Vokera t...

Page 11: ... to which BS 5440 PART 1 FLUES BS 5440 PART 2 FLUES VENTILATION BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW BS 6891 LOW PRESSURE INSTALLATION PIPES BS 7074 PART 1 APPLICATION SELECTION AND INSTALLTION OF EXPANSION VESSELS AND ANCILLARY EQUIPMENT FOR SEALED ...

Page 12: ...1363 is acceptable 3 8 MOUNTING ON A COMBUSTIBLE SURFACE If the appliance is to be fitted on a wall of combustible material a sheet of fireproof material must protect the wall 3 9 TIMBER FRAMED BUILDINGS If the appliance is to be fitted in a timber framed building it shouldbefittedinaccordancewiththeInstituteofGasEngineers publication IGE UP 7 Guide for Gas Installations in Timber Frame Buildings ...

Page 13: ... SEALED SYSTEM An alternative method of filling the system would be from an independent make up vessel or tank mounted in a position at least 1 metre above the highest point in the system and at least 5 metres above the boiler see fig 9 The cold feed from the make up vessel or tank must be fitted with an approved non return valve and stopcock for isolation purposes The feed pipe should be connecte...

Page 14: ... to the maximum length see table below when additional bends are used Reduction for additional bends Bend Reductioninmaximumfluelengthforeachbend 45º bend 0 5 metre 90º bend 1 0 metre Horizontal flue terminals and accessories Part No Description Length 29450120 Horizontal flue kit 900mm 29450121 Telescopic flue kit 350 530mm 522 Plume management kit 1370mm 29450123 90 degree bend N A 29450124 45 d...

Page 15: ...tric flue system The vertical flue terminal can be connected directly to the appliance flue outlet Alternatively an extension or bend can be connected to the appliance flue outlet if desired however if additional bends are fitted a reduction must be made to the maximum flue length see table below Reduction for bends Bend Reduction in maximum flue length for each bend 45º bend 0 5 metre 90º bend 1 ...

Page 16: ... 0 metre 0225810 Vertical flue terminal 1 0 metre 359 Twin adapter kit N A 531 Pitched roof flashing plate N A 532 Flat roof flashing plate N A 0225815 Condensate drain kit N A 0225820 0 25m extension pair 250mm 0225825 0 5m extension pair 500mm 0225830 1 0m extension pair 1000mm 0225835 2 0m extension pair 2000mm 0225840 45º bend pair N A 0225845 90º bend pair N A 0225850 Twin bracket 5 N A 02258...

Page 17: ...erter NOTE Before cutting twin flue pipes ensure allowances have been made for connection onto the previous piece and onto the concentric to twin converter The last twin flue pipes must be pushed 50mm onto the male spigots of the concentric to twin converter You must ensure that the entire flue system is properly supported and connected Ensure that any horizontal sections of pipe have a 1º fall to...

Page 18: ...ernal electrical circuits please refer to section 8 for detailed instructions ANY EXTERNAL CONTROL OR WIRING MUST BE SERVED FROM THE SAME ISOLATOR AS THAT OF THE APPLIANCE The supply cable from the isolator to the appli ance must be 3 core flexible sized 0 75mm to BS 6500 or equivalent Wiring to the appliance must be rated for operation in contact with surfaces up to 90 ºC 4 7 1 CASING REMOVAL fig...

Page 19: ...nd in accordance with the instructions ensure all appliance service valves are open 5 6 INITIAL LIGHTING Ensure the electrical supply to the appliance is switched on Ensure any external controls are switched to an ON position and are calling for heat Move the selector switch to the ON position the appliance will now operate as described in 1 2 Should the appliance fail to ignite refer to 5 6 and o...

Page 20: ...nchmark checklist is correctly completed and handed to the user Failure to install and com mission the appliance to the manufacturers instructions may invalidate the warranty 5 13 INSTRUCTING THE USER Hand over all documentation supplied with this appliance including these instructions and explain the importance of keeping them in a safe place Explain to the user how to isolate the appliance from ...

Page 21: ...bly and remove the AAV assembly L Replace in the reverse order 6 8 WATER PRESSURE SWITCH fig 24 Carry out component removal procedure as described in 6 4 Locate and remove the locking pin M from the water pressure switch N Remove the wiring Carefully withdraw the switch Replace in the reverse order 6 9 FLOW THERMISTOR fig 4 pos 15 Carry out component removal procedure as described in 6 4 Unclip an...

Page 22: ...anger J1 Gently ease the fan assembly out of its location Once the assembly has been removed the burner K1 can be withdrawn from the heat engine Ensure the seals L1 is in good condition taking care to ensure it is replaced correctly Replace in the reverse order Fig 27 6 13 ELECTRODES fig 27 Carry out component removal procedure as described in 6 4 Remove the air chamber front cover Disconnect the ...

Page 23: ...rocedure as described in 6 4 Remove the locking pin Q1 that secures the cover R1 to the hydraulic manifold Using a hooked piece of wire carefully withdraw the by pass cartridge S1 Ensure all seals are in goodcondition takingcaretoensuretheyarereplacedcorrectly Replace in the reverse order ensuring the cartridge is facing the correct way 6 18 EXPANSION VESSEL REMOVAL fig 31 Carry out component remo...

Page 24: ... exchanger as per 6 16 Locate and remove the screw Y1 that secures the flue gas analysis test point cover Z1 Disconnect the flues thermistor wiring connections Locate and remove the 4 screws A2 Locate and remove the 2 screws A3 Gently ease the condensate collector A4 out off its location Gently ease the flue collector out off its location Replace in the reverse order ...

Page 25: ...period of 30 seconds SARA function the SARA function permits the boiler when the set point is within the SARA range to automatically adjust raise the heating flow outlet temperature should the room thermostat contacts remain closed for more that 20 minutes 7 2 3 HEATING MODE With the selector switch in the heating hot water position and any additional controls time clock programmer room thermostat...

Page 26: ...CKING THE EXPANSION VESSEL Carry out the component removal procedure as described in 6 4 You must ensure that the boiler is completely drained of water Using a suitable pressure gauge remove dust cap on expansion vessel and check the charge pressure The correct charge pressure should be 1 0 bar 0 1 bar If the charge maximum adjustment screw compensation pipe connection minimum adjustment screw inl...

Page 27: ... fault These series of checks must be carried out before attempting any faultfinding procedures on the appliance On completion of any task that required the disconnection and re connection of any electrical wiring or component these checks must be repeated 7 8 FAULT FINDING Before attempting any faultfinding the electrical checks as detailed in 7 7 must be carried out Isolate the appliance from th...

Page 28: ...S The appliance can be used with the following controls single channel voltage free time clocks fig 38a programmable room thermostats fig 38b twin channel programmers The appliance can be used in conjunction with typical S Plan systems for Y Plan systems a relay is required please contactVokera technical should you require further detailed instruction 8 3 OTHER DEVICES Contact the controls manufac...

Page 29: ...y 230 V F Lv Fan signal control WPS Water pressure switch S E Spark electrode TSC2 Ignition transformer F O H T Flow over heat thermostat FS Flue sensor FT Flow thermistor NTC RS Return thermistor NTC AKL Main PCB P1 Selector switch and heating potentiometer P2 Unused P3 Unused P4 Unused JP1 Unused JP2 Unused JP3 Unused JP4 Unused JP5 Selection operating only heating JP6 Unused JP7 Unused JP8 Clos...

Page 30: ... panel cover 20026055 20 Printed circuit board 20025735 21 led light guide 20013352 26 Instrumental panel 20035501 27 Knob 20013055 31 Case Assembly 20026073 34 Fixing flange 20023928 90 Fuse R3478 100 Power wiring harness 20005572 101 Cable R1547 102 Low tension cable 20035502 34 12 26 18 27 20 21 90 1 31 100 101 102 Table 1 ...

Page 31: ...ss assembly R10024643 48 Cock R10024646 63 Pipe 20025755 201 Washer R5026 266 Washer R5237 288 Ring R6898 290 Clip R2165 343 Pump plug R2216 432 Clip R10024958 435 Fitting union R10025059 436 Clip R10025062 440 Automatic by pass plug R10024645 441 Clip R10025063 442 O ring R10025065 443 O ring R10025064 444 Washer R10025066 288 436 201 435 288 432 432 432 47 444 443 48 290 442 6 7 435 288 432 441 ...

Page 32: ...r kit 20019888 60 Racord 20025762 66 Flexible pipe R10027545 71 Pipe 20025746 72 Vent plug R10023235 73 Cock R10028431 200 Washer R5023 288 Ring R6898 290 Clip R2165 302 Washer R5025 370 O ring R10023533 371 Clip R10023532 432 Clip R10024958 619 Pressure 20003181 624 Clip R5472 625 High limit thermostat 20005585 633 Water detector 20003819 668 Clip 20019767 10 288 633 619 290 200 1 2 302 432 71 62...

Page 33: ...bustion chamber cover 20005594 18 Plug 20005550 27 Hole cover 20005586 33 Seal ignition electrode 20025740 46 Gas diaphragm R10029209 72 Mixer 20026083 77 Washer 20025753 79 Electrode 20025738 92 Suction pipe 20025760 96 Diaphragme 20026082 200 Washer R5023 436 Clip R10025062 613 Ignition transformer 20001563 684 Washer 20025747 3 13 14 200 15 16 18 27 1 12 684 436 72 92 33 5 79 77 4 613 96 46 ...

Page 34: ...ction R10028421 20 Outlet nut 20026049 26 Plug 20026058 75 Flue cllector 20026056 370 O ring R10023533 487 Washer Ø 60 R10026345 552 Washer Ø 60 R10028426 637 Flue sensor 20007050 686 Washer 20026059 700 Combustion cable 20025736 637 7 552 12 487 26 686 75 370 370 20 700 ...

Page 35: ...hat it serves 10 5 GAS SUPPLY INSTALLATION The entire installation including the meter must be purged and checked for gas tightness 10 6 2 GAS VALVE MAXIMUM SETTING Set the CO button at maximum see 10 3 1 once the maximum is obtained only yellow led blinking check that it corresponds with the appropriate CO2 value Maximum for the respective appliance If the CO2 reading is correct proceed to gas va...

Page 36: ...s ALL INSTALLATIONS If required by the manufacturer record the following CO2 OR CO ppm OR CO CO 2 Ratio The heating and hot water system complies with the appropriate Building Regulations Yes The boiler and associated products have been installed and commissioned in accordance with the manufacturer s instructions Yes The operation of the boiler and system controls have been demonstrated to and und...

Page 37: ...Signature SERVICE 7 Date Energy Efficiency Checklist completed Yes No Engineer Name Company Name Telephone Number CORGI ID Number Comments Signature SERVICE 9 Date Energy Efficiency Checklist completed Yes No Engineer Name Company Name Telephone Number CORGI ID Number Comments Signature SERVICE 2 Date Energy Efficiency Checklist completed Yes No Engineer Name Company Name Telephone Number CORGI ID...

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Page 40: ...es 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 Consumers statutory rights are not affected A Riello Group Company Company Reg No 1047779 ...

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