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1

Mynute

 INTRODUCTION

General layout
1

Safety valve

2

Pressure switch

3

Hydraulic manifold

4

Pump

5

Automatic air release valve

6

Electrode

7

Combustion chamber

8

Main heat exchanger

9

Fan assembly

10

Air chamber (with front removed)

11

Flue gas analysis test point

12

Flue outlet

13

Air intake

14

Pressure differential switch

15

Silicone pressure tubes

16

Expansion vessel

17

Flow NTC

18

High limit thermostat

19

Main burner

19A Burner thermostat (only for 35e)
20

Transformer

21

Gas valve

22

Modulator coil

23

Status LED

24

Led display

25

Heating temperature control

26

Combustion switch

27

Timeclock aperture (optional)

28

Pressure gauge

29

Mode selector switch

The Vokera Mynute is a central heating boiler, which - by
design - incorporates electronic ignition, circulating pump,
expansion vessel, safety valve, pressure gauge and
automatic by-pass.

It is produced as a room sealed, category II2H3+ appliance,
suitable for wall mounted-internal-applications only. It is
provided with a fan powered flue outlet with an annular
co-axial combustion air intake that can be rotated –
horizontally – through 360 degrees for various horizontal
or vertical applications.

The Mynute can also be used with the Vokera twin flue
system.

This appliance is designed for use with a sealed system
only; consequently it is not intended for use on open
vented systems.

The provision of stored hot water is possible by the
addition of an indirect cylinder.

Fig. 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

19A

20

21

22

only for 35e

Summary of Contents for Mynute 28e

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

Page 2: ...l lighting 14 5 7 Checking the burner pressure 15 5 8 Final flushing of the heating system 15 5 9 Setting the boiler operating temperature 15 5 10 Setting the system design pressure 15 5 11 Regulating...

Page 3: ...e selector switch The Vokera Mynute is a central heating boiler which by design incorporateselectronicignition circulatingpump expansion vessel safety valve pressure gauge and automatic by pass Itispr...

Page 4: ...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 temperature the...

Page 5: ...m Top 150 mm from casing or 25 mm above flue elbow whichever is applicable Bottom 150 mm Front 600 mm 2 6 Connections Flow return 22 mm compression Gas 15 mm compression Safety valve 15 mm copper 2 7...

Page 6: ...otland Regulation and Building Standards Northern Ireland Regulations It should be in accordance also with any relevant requirementsofthelocalauthorityandtherelevant recommendationsofthefollowingBriti...

Page 7: ...tes are for general guidance only 3 6 1 PIPEWORK ItisrecommendedthatcoppertubingtoBS2871Part 1 is used in conjunction with soldered capillary joints Where possible pipes should have a gradient to ensu...

Page 8: ...ensate discharge into a suitable drain or soil pipe The condensate outlet pipe must be connectedtothedraininaccordancewithbuilding regulations or other rules in force 3 11 INHIBITORS Vokera recommend...

Page 9: ...pboard or compartment ventilation for cooling purposes is also not required 3A 6 WATER CIRCULATION Specific recommendations are given in I S 813 The following notes are for general guidance only 3A 6...

Page 10: ...cted with a 3 amp fuse The method of connection to the mains electricity supply must allow for complete isolation from the supply The preferred method is by using a double pole switch with a contact s...

Page 11: ...0mm dimension X 600mm 920mm dimension X 833mm dimension X 750mm 1500mm N A N A N A 4 4 2 MAXIMUM FLUE LENGTHS 4 5 FITTING THE FLUE The top flue outlet permits both horizontal and vertical flue applica...

Page 12: ...pplied with the terminal kit to the top of the boilerusingtheclips screws gasketssupplied Theadditionalbend extensionshaveaninternal push fit connection care should be taken to ensure that the correct...

Page 13: ...entric flue system It can be used for horizontal or vertical applications however the twin flue system must be converted to the dedicated concentric flue kit for termination It is essential that the i...

Page 14: ...e wall The air inlet pipe must always be level with or below that of the exhaust pipe Depending on site conditions it may be preferable to install the terminal assembly prior to fitting the twin flue...

Page 15: ...arge pipe to the safety valve outlet and tighten The discharge pipe must have a continuous fall away from the appliance to outside and allow any water to drain awaytherebyeliminatingthepossibilityoffr...

Page 16: ...er and heating system as described in 5 3 5 5 PRE OPERATION CHECKS Before attempting to initial lighting of the appli ance the following checks must be carried out ensure all gas service valves from t...

Page 17: ...s 45 psig To lower the system pressure to the required value pull lever on head of safety valve to release water until the required figure registers on the pressure gauge see fig 1 5 11 REGULATING THE...

Page 18: ...to the commissioning section and or re placement of parts section for detailed instruction if required 6 3 REPLACEMENT OF COMPONENTS Although it is anticipated that this appliance will give years of r...

Page 19: ...minal cover then remove cover after carefully taking note of all wiring connections disconnect all wiring from the PCB locate and remove the PCB securing screws remove PCB Replace in the reverse order...

Page 20: ...dure as de scribed in 6 4 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 cov...

Page 21: ...air chamber Discon nect the electrode lead and burner thermostat wires Disconnect the outlet gas pipe and the flow return pipes from the air chamber Locate and remove the 2 screws that secure the low...

Page 22: ...al supply and attach a suitable manometer to the gas valve outlet test nipple Remove the compensator tube 28e only 7 3 1 SETTING THE MAXIMUM BURNER PRESSURE Light the boiler as described in 5 6 and co...

Page 23: ...rry out the following voltage tests connect test leads between the Live Neutral connectionsattheapplianceterminalstrip see fig 16 the meter should read approximately 230V ac If so proceed to next stag...

Page 24: ...boiler does not reset refer to the following section and the detailed fault finding flowcharts overleaf FAULT CODE 01 Fault code 01 appears when the burner has failed to ignite or the flame supervisi...

Page 25: ...b YES Is there 5vdc across terminals M9 1 M9 2 on main PCB YES Is there 5vdc across terminals M2 1 M2 2 on main PCB Go to test B YES Replace display PCB YES NO Replace main PCB NO Replace ribbon cable...

Page 26: ...connections YES NO Is there 230V between terminals M12 1 M12 2 YES Is there 230V between L N terminals of fan Check wiring continuity YES Replace fan Is there 24Vdc between M5 3 M3 3 NO NO Replace mai...

Page 27: ...DC between terminals M3 10 M3 11 on PCB NO Checking wiring connections or analog air sensor NO YES Replace main PCB YES Check wiring connections check water pressure switch NO YES Checking wiring conn...

Page 28: ...ok NO NO YES Replace gas valve Check gas Is ionisation voltage ok NO YES Replace ignition PCB NO Replace spark electrode Replace spark electrode FAULT FINDING TEST E Mynute 28e 35e turn the selector t...

Page 29: ...8 3 INSTALLATION OF VOKERA TIME CLOCK 24 hours 7 day versions Isolate the appliance from the electrical supply and remove the casing as described in 4 7 1 Remove the circular blanking disc from the cl...

Page 30: ...28 Mynute S plan system external programmer or integral Vokera programmer Fig 28...

Page 31: ...rmostat Add if programmer has heating only position Twin channel programmer 230V supply 50Hz Wiring centre Room thermostat White Grey Orange Blue Green Yellow Vokera twin channel programmer Appliance...

Page 32: ...PE Gas valve solenoids B C B Burner control board B E B Boiler control board D B Secondary board JP8 Natural gas or L P G selector Fig 30 JP9 Timer on off selector PT2 Central heating temperature cont...

Page 33: ...Gas valve solenoids B C B Burner control board B E B Boiler control board S B Secondary board JP8 Natural gas or L P G selector JP9 Timer on off selector PT2 Central heating temperature control PT1 S...

Page 34: ...32 Mynute NOTE L N E CONNECTION IS ADVISABLE CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT IS 230 V a c FUNCTIONAL DIAGRAM 28e Fig 32...

Page 35: ...33 Mynute FUNCTIONAL DIAGRAM 35e NOTE L N E CONNECTION IS ADVISABLE CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT IS 230 V a c Fig 33...

Page 36: ...0024731 26 Instrumental panel R10023051 R10024756 31 Case R1922 R2062 38 Control printed circuit board R10020477 R10020477 39 Spring R1862 R1862 40 Door panel R10022860 R10024757 43 Push push cover R1...

Page 37: ...044 7 Heating by pass valve R1552 R1552 9 Heating distributor manifold R10021821 R10021821 22 Safety valve R1806 R1806 23 Pipe R10023065 R10023065 27 Heating cock R1789 R1789 31 Venting plugs kit R010...

Page 38: ...ing harness R1845 R1845 6 Pump pipe R1917 R10023209 7 Pipe R1847 R2051 8 Heat exchanger R2378 R10024580 9 Pipe R10021041 R10020519 10 Pipe R10022859 R10024754 11 Bracket R1642 R1642 15 Automatic air v...

Page 39: ...fle R2069 9 Burner plate R5172 11 Air box clip R0442 R0442 12 Gas pipe R1839 R1839 13 Gas valve R10021021 R10021021 14 Gas pipe R1840 R1840 15 Gas cock R1787 R1787 16 Cover assembly R10020217 R1002043...

Page 40: ...sembly R5907 R1968 10 Fan R6492 R10024577 12 Fan to flue connector R10023183 R10023183 16 Clamp for 60 diam tube R5916 R5916 17 Washer clamp R5917 R5917 19 Fan flue connection R8083 R8083 20 Block wit...

Page 41: ...of the boiler burner pressure is not compromised due to a high flow temperature For details of converting boilers to LPG please refer to the instructions supplied with the relevant conversion kit 10...

Page 42: ...40 Mynute...

Page 43: ...41 Mynute...

Page 44: ...eneral Enquiries Tel 0870 333 0520 Fax 01442 281403 After Sales Service Tel 0870 333 0220 Vok ra Ireland West Court Callan Co Kilkenny Tel 05677 55057 Fax 05677 55060 Vok ra Ltd reserve the right to c...

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