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- Mynute EHE
- Installation & Servicing Instructions Manual
VOKERA Mynute EHE Installation & Servicing Instructions Manual
Summary of Mynute EHE
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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 ehe high efficiency system boiler.
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Contents design principles and operating sequence page 1.1 principle components 2 1.2 mode of operation (at rest) 2 1.3 mode of operation (heating) 2 1.4 safety devices 2 technical data page 2.1 central heating 3 2.2 gas pressure 3 2.3 expansion vessel 3 2.4 dimensions 3 2.5 clearances 3 2.6 connect...
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1 introduction fig.1 general layout 1 hydraulic manifold 2 discharge valve 3 safety valve 4 pump 5 pressure switch 6 auto air vent (aav) 7 electrode 8 main burner 9 main heat exchanger 10 latent heat collector 11 flue gas analysis test point 12 flue outlet 13 air intake 14 differential pressure swit...
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2 section 1 design principles and operating sequence fig. 2 1.1 principle components ● a fully integrated electronic control board featuring elec- tronic temperature control, anti-cycle control, pump over- run, led fault indicator, full gas modulation. ● low-water-content, copper heat exchanger. ● e...
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3 section 2 technical data 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 minimum heat output@ 50/30 °c (kw) 14.85 14.75 14.55 minimum...
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4 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. 3 fig. 4 section 3 general require...
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5 this appliance must be installed by a competent person in accordance with the gas safety (installation & use) regu- lations. 3.1 related documents the installation of this boiler must be in accordance with the relevant requirements of the gas safety (installation & use) regulations, the local buil...
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6 3.6.7 low pressure 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. 5a). The cold feed from the make-up vessel ...
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7 fig. 6 section 3 general requirements (eire) this appliance must be installed by a competent person in accordance with and defined by the standards specifica- tion (domestic gas installation) declaration (i.S. 813). 3a.1 related documents the installation of this boiler must be in accordance with ...
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8 condense on leaving the terminal; the effect of such pluming must be considered. If installed less than 2m above a pavement or platform to which people have access (includ- ing balconies or flat roofs) the terminal must be protected by a guard of durable material. The guard must be fitted centrall...
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9 section 4 installation 4.1 delivery due to the weight of the appliance it may be necessary for two people to lift and attach the appliance to its mounting. The appliance is contained within a heavy-duty cardboard carton. Lay the carton on the floor with the writing the correct way up. 4.2 contents...
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10 fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside, ensuring that the collar on the flue terminal fits over the flashing. The fixing holes for the wall-mounting bracket should now be drilled and plugged, an appropriate ...
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11 mounted securely. Once the bracket has been secured to the wall, mount the appliance onto the bracket. Important the vertical flue terminal is 1.0 metre in length and cannot be cut; therefore it may be necessary to adjust the height of the appliance to suit or use a suitable extension. Connect th...
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12 4.6 connecting the gas and water the appliance is supplied with service valves. The service valves are of the compression type. The accessories pack contains sealing washers etc, for use with the service valves. When connecting pipe work to the valves, tighten the compression end first then inser...
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13 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 colle...
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14 fig. 16 protective cap outlet test-point inlet test-point section 5 commissioning 5.1 gas supply installation inspect the entire installation including the gas meter, test for soundness and purge. Refer to bs 6891 for specific instruction. 5.2 the heating system the appliance contains components ...
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15 for soundness. ● ensure the appliance flue system is fitted correctly and is properly secured. ● ensure all pipe work is re-checked for soundness. ● re-fit appliance casing. ● complete benchmark checklist. Complete details of the boiler, controls, installation, and com- missioning in the benchmar...
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16 fig. 21a fig. 22 fig. 21 6.7 automatic air release valve (fig. 17, aav) carry out component removal procedure as described in 6.4. Locate and remove the expansion pipe securing pin and disconnect the expansion pipe from the pump assem- bly. Locate and remove the aav securing pin ( g ) and lift th...
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17 6.16 flue fan (fig. 25) carry out component removal procedure as described 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 cover, then remove the cover. Disconnect ...
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18 fig. 28 b a 6.20.1 expansion vessel removal (with sufficient clearance above) carry out component removal procedure as described in 6.4. Disconnect the flue from the appliance. Disconnect the flexible expansion pipe from the vessel. Locate and remove the four screws (a) that secure the vessel top...
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19 range minimum maximum temperature (°c) 40 80 1 st sector 40 55 sara sector 55 65 3 rd sector 65 80 7.1 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 ...
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20 7.3 checking and adjusting burner pressure (fig. 16) although the burner pressure is factory set, it is necessary to check it during commissioning, servicing, or if the gas valve has been removed. Isolate the appliance from the electrical supply and attach a suitable manometer to the gas valve ou...
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21 note you must ensure the drain valve is in the open position whilst re-charging takes place. Replace the dust cap and carry out the relevant commissioning procedure (section 5). 7.6 external faults before carrying out any faultfinding or component replace- ment, ensure the fault is not attributab...
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22 frequency faults/status on every 0.5-secs co function active solid internal fault yellow led frequency faults/status on every 0.5-secs final fault, e.G.: ● ● ● ● ● water pressure switch ● ● ● ● ● condense pressure switch ● ● ● ● ● fan/flue problem ● ● ● ● ● limit thermostat solid primary ntc open...
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23 7.10.2 fault finding test ‘a’ yes no no mains on e.V.G. No yes no no yes yes yes no is there 24 vdc between terminals cn8.4 & cn8.5 on pcb a replace sensing/spark electrode and lead replace pcb sensing spark electrode and lead ok chek sensing/spark electrode and lead end lockout ignition replace ...
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24 7.10.3 fault finding test ‘a1’ no yes a1 replace control board fuse ok check fuse f1 on control board red led blinks mains present between terminals cn1.2 &cn1.3 on control yes no restart the test replace fuse no no replace control board red led light yes yes switch on/off selector on off positio...
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25 7.10.4 fault finding test ‘c’: check control in ch mode no yes no yes yes no yes no replace control board replace control board remove jumper is timer jumper on is voltage across terminals of modulator coil >10 vdc is voltage across terminals of modulator coil check boiler startup test a set time...
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26 7.10.6 test ‘c’ cont’d yes wait 3 min. C no do burner and fan switch off is water flow temperature >40 °c wait water flow temperature >40 °c replace control board switch ch thermostat at max. Do burner and fan switch on is water flow temperature >80 °c wait water flow temperature no yes replace c...
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27 section 8 wiring diagrams 8.1 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 control...
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28 8.4 integral clock 8.5 external clock remove link wire! Brown blue yellow-green fusible 2af external time clock elec- tronics voltage-free room thermostat fig. 39 integral or external clock remove link wire! Black black brown blue brown blue black black brown blue yellow-green fig. 38 8.6 other c...
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29 functional diagram note: l-n-e connection is advisable fig. 40 key cp control board p2 off-summer-winter-combustion test p3 central heating temperature control p4 minimum heating regulation p5 maximum heating regulation (if required) jp1 c.H. Only selector jp2 setting timer jp3 natural gas or l.P...
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30 section 9 exploded diagrams pos. Description mynute 25 ehe mynute 29 ehe mynute 35 ehe 1 frame assembly r01005403 r01005406 r01005410 10 water gauge carrier r10029105 r10029105 r10029105 12 pressure gauge r10029421 r10029421 r10029421 18 cover r10024976 r10024976 r10024976 20 printed circuit boar...
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31 pos. Description mynute 25 ehe mynute 29 ehe mynute 35 ehe 3 r2726 r2726 r2726 6 by-pass casing r10024641 r10024641 r10024641 7 heating by-pass valve r2047 r2047 r2047 9 heating manifold and cartridge r10027768 r10027768 r10027768 10 3 way valve cartridge r10025305 r10025305 r10025305 12 clip r10...
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32 pos. Description mynute 25 ehe mynute 29 ehe mynute 35 ehe 1 expansion vessel r2204 r2573 r2573 2 pipe r10025188 r10025188 r10025188 3 pump r10027571 r10027571 r10027571 6 pipe r10027541 r10027566 r10027741 7 pipe r10024312 r10024130 r10024519 8 exchanger r2381 r2378 r10020513 9 pipe r10021041 r1...
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33 pos. Description mynute 25 ehe mynute 29 ehe mynute 35 ehe 1 roomsealed chamber r10027533 r10027562 r10028011 2 roomsealed chamber side r10024166 r10024166 r2059 4 n.G. Burner r10027536 r10027564 r10028013 5 spark / ignition electrode r10025985 r10025985 r10025985 9 plate r5172 r5172 r5172 10 gas...
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34 pos. Description mynute 25 ehe mynute 29 ehe mynute 35 ehe 1 combustion chamber assembly r10025935 r10026406 r10020514 2 back insulatin panel r5270 r5316 r10020518 3 protection r5271 r5271 r5271 4 combustion chamber insulation panel r5269 r5315 r10020517 7 flue draught diverter r10024310 r1002412...
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35 section 10 l.P.G. Instructions 10.3 converting the appliance gas type to convert the appliance to another gas type it is necessary to change the burner injectors and adjust the gas pres- sures. It is also necessary to ensure the jumper tag at jp3 is enabled or disabled according to the gas type u...
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36 controls to comply with the building regulations, each section must have a tick in one or other of the boxes time & temperature control to heating room t/stat & programmer/timer programmable roomstat time & temperature control to hot water cylinder t/stat & programmer/timer combi boiler heating z...
Page 39: Service Interval Record
37 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 descri...
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Cod. 20001636 - ed. 1 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 77550...