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  5. Installation & Servicing Instructions Manual

VOKERA Mynute VHE Installation & Servicing Instructions Manual

Other manuals for Mynute VHE: User Instruction

Summary of Mynute VHE

  • Page 1

    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 vhe high efficiency open vent boiler.

  • Page 2

    Contents design principles & operating sequence page 1.1 principle components 3 1.2 mode of operation (at rest) 3 1.3 mode of operation 3 1.4 safety devices 3 technical data page 2.1 central heating 4 2.2 gas pressures 4 2.3 dimensions 4 2.4 clearances 4 2.5 connections 4 2.6 electrical 4 2.7 flue d...

  • Page 3

    1 the mynute vhe is a high-efficiency boiler for open vent system. These appliances – by design – incorporate premix combustion and a radial aluminium heat exchanger. The mynute vhe range are produced as room sealed, category ii2h3p appliances, suitable for internal wall mounting applications only. ...

  • Page 4

    2 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 any heating/hot water request from the time-clock/programmer) boiler switched on select this position when...

  • Page 5

    3 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. ● ● ● ● ● radial aluminium heat exchanger. ● ● ● ● ● electronic ignition with flame ...

  • Page 6

    4 ref. Condition 15 °c, 1013,25 mbar, dry gas note: l.P.G. Data refer to section 10 section 2 technical data 2.1 central heating mynute 20 vhe heat input (kw) 20 maximum heat output (kw) 60/80°c 19.68 minimum heat output (kw) 60/80°c 5 maximum heat output (kw) 30/50°c 21.16 minimum heat output (kw) ...

  • Page 7

    5 fig. 3 key location minimum distance a below an opening (window, air-brick, etc.) 300 mm b above an opening (window, air-brick, etc.) 300 mm c to the side of an opening (window, air-brick, etc.) 300 mm d below gutter, drain-pipe, etc. 25 mm e below eaves 25 mm f below balcony, car-port roof, etc. ...

  • Page 8

    6 section 3 general requirements (uk) this appliance must be installed by a competent person in accordance with the gas safety (installation & use) regulations. 3.1 related documents the installation of this boiler must be in accordance with the relevant requirements of the gas safety (installation ...

  • Page 9

    7 3.6.3 drain cocks these must be located in accessible positions to facilitate draining of the appliance and all water pipes connected to the appliance. The drain cocks must be manufactured in accordance with bs 2879. 3.6.4 air release points these must be positioned at the highest points in the sy...

  • Page 10

    8 fig. 4c fig. 4b fig. 4d note ● ● ● ● ● the distance between the cold feed pipe and the safety vent pipe shall be no more than 150mm ● ● ● ● ● the cold feed pipe must be inverted as shown in figure 4b ● ● ● ● ● the safety vent pipe must be 22mm in diameter ● ● ● ● ● the cold feed pipe must be 15mm ...

  • Page 11

    9 section 3a general requirements (eire) 3a.1 related documents the installation of this boiler must be in accordance with the relevant requirements of the local building regulations, the current etci national rules for electrical installations and the bylaws of the local water undertaking. It shoul...

  • Page 12

    10 136,8 3 6 0 143 741 115 1 5 0 3 5 884 1 5 0 4 0 0 27 27 740 739 27 wall mounted, fanned flue system boiler mynute 20 vhe return gas flow 3a.10 inhibitors vokera recommend that an inhibitor - suitable for use with aluminium heat exchangers - is used to protect the boiler and system from the effect...

  • Page 13

    11 horizontal flue terminals and accessories part no. Description length 520 521 522 523 524 525 526 527 528 529 horizontal flue kit telescopic flue kit plume management kit 90-degree bend 45-degree bends (pair) 500mm extension 1000mm extension 2000m extension telescopic extension wall bracket pack ...

  • Page 14

    12 fitting the horizontal flue kit carefully measure the distance from the centre of the appliance flue outlet to the edge of the finished outside wall (dimension x). Add 65mm to dimension x to give you dimension y (see fig 7a). Measure dimension y from the terminal end of the concentric flue pipe a...

  • Page 15

    13 reduction in maximum flue length for each bend reduction for bends bend 45° bend 90° bend 1.0 metre 1.0 metre reduction for bends bend reduction in maximum flue length for each bend 45° bend 90° bend 0.5 metre 1.0 metre vertical flue terminal and accessories part no. Description min-max length 53...

  • Page 16

    14 mounting the boiler the fixing holes for the wall-mounting bracket should now be drilled and plugged, an appropriate type and quantity of fixing should be used to ensure that the bracket is mounted securely. Once the bracket has been secured to the wall, mount the appliance onto the bracket. 4.5....

  • Page 17

    15 fig. 13 4.6 connecting the gas and water the appliance is supplied with a 15mm service valve for the gas connection and 22mm copper to brass adapters for the flow and return connections. The service valve is of the compression type. The accessories pack also contains sealing washers etc, for use ...

  • Page 18

    16 fig. 14 fig. 15 mains (230v) terminal block fig. 16 b b b b 4.7.1 casing removal (fig. 14) to gain internal access to the appliance you must first remove the casing, proceed as outlined below: • locate and remove the 2-screws on the front underside of the casing (c.) • remove the 2 screws (b) loc...

  • Page 19

    17 5.1 gas supply installation inspect the entire installation including the gas meter, test for soundness and purge. Refer to bs 6891 (i.S. 813 in roi) for specific instruction. 5.2 the heating system the appliance contains components that may become damaged or rendered inoperable by oils and/or de...

  • Page 20

    18 5.9 setting the boiler operating temperature the flow outlet temperature can be adjusted between 20 °c - 78 °c via the heating thermostat knob (see fig.1). 5.10 regulating the central heating system fully open all radiator and circuit valves and run the appliance for both heating and hot water un...

  • Page 21

    19 section 6 servicing instructions 6.1 general to ensure the continued safe and efficient efficient operation of the appliance, it is recommended that it is checked and serviced at regular intervals. To ensure correct and safe operation of the appliance, it is essential that any worn or failed comp...

  • Page 22

    20 fig. 23 a c d a b e c d fig. 22 fig. 20 a b note of all wiring connections and jumper tag configuration, disconnect all wiring from the pcb, locate and remove the pcb securing screws, remove the required pcb. Replace in the reverse order ensuring that the position of the 3 control knobs are corre...

  • Page 23

    21 e f b a d c fig. 24 6.14 main heat exchanger (fig. 25 & 26) carry out component removal procedure as described in 6.4. Unclip and remove the three air chamber covers (front, lh, rh sides). Disconnect all the wiring connections. Fig. 25: slacken the gas pipe (a) at the air box connection and swing...

  • Page 24

    22 7.1 checking appliance operation when carrying out any repairs or servicing to the appliance, the relevant commissioning procedure must be undertaken to ensure the continued safe operation of the appliance. Particular attention should be made to ensure gas soundness, water soundness, and the elec...

  • Page 25

    23 fig. 29 7.3.6 fan speed table use the following table to set the corresponding fan speeds that are relative to the appliance you are working on. Fan speed (rpm) table model max min htg ign 20he 5.400 1.700 5.400 3.700 7.3 appliance fan speeds the appliance fan speeds require to be checked and/or ...

  • Page 26

    24 7.7 electrical checks any electrical checks must be carried out by a suitably qualified person. 7.7.1 earth continuity test isolate the appliance from the electrical supply, and using a suitable multi-meter carry out a resistance test. Connect test leads between an appliance earth point and the e...

  • Page 27

    25 7.10 fault codes when the boiler detects a temporary fault condition, the appropriate code is shown flashing on the display. If/when the fault code is final, the pump will perform a 60-second post circulation and the red led will be illuminated. Code cause alarm type action al10 ignition failure/...

  • Page 28

    26 8.1 external wiring the appliance comes with a factory fitted (ta) link to allow basic operation of the boiler via the mode selector switch. 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 controls that ...

  • Page 29

    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. Key f hv fan power supply 230 v f lv fan signal control e.P. External pump f fuse 3.15a f (fast) f1-f2 fuse 3.15a t (delay) ope gas valve solenoids s....

  • Page 30

    28 functional diagram 8.4.1. “s” - plan with vokera 2-channel programmer 8.4.2. “y” - plan with vokera 2-channel programmer fig. 33 fig. 34 n l e.

  • Page 31

    29 section 9 exploded diagrams table 1 40 27 26 63 226 20 21 18 77 39 226 31 90 1 300 301 pos. Description 20vhe 1 frame assembly 01005496 18 cover assembly 10028554 20 printed circuit board 10029717 21 led light guide 10028557 26 instrumental panel 10028551 27 knob assembly 10028559 31 case assembl...

  • Page 32

    30 table 2 200 27 200 27 200 580 200 580 36 25 200 200 pos. Description 20vhe 25 pipe 10029590 27 pipe 10029592 36 pipe 10029591 200 washer 5023 580 connection m 3/4 - 3/4 10029526.

  • Page 33

    31 table 3 574 582 71 73 72 581 9 7 581 247 476 476 17 25 27 512 26 pos. Description 20vhe 7 pipe 10026267 9 pipe 10029515 17 air venting plug 10029306 25 siphon 10028405 26 flexible pipe 10028540 27 flexible pipe 10027192 71 pipe 10028430 72 drain tap 01005137 73 cock 10028431 247 washer 5203 476 o...

  • Page 34

    32 46 69 4 5 19 6 35 67 3 72 486 497 39 79 2 1 27 2 479 16 13 200 12 200 15 27 500 501 502 600 601 pos. Description 20vhe 1 roomsealed chamber 10028341 2 roomsealed chamber side 10026231 3 fan 10028456 4 burner assembly 10028537 5 spark / ignition electrode 10027864 6 condense electrode 10026316 12 ...

  • Page 35

    33 7 12 487 552 482 475 1 509 600 601 pos. Description 20vhe 1 condensing exchanger assembly 01005443 7 conveyor 10028536 12 flue drain connection 10028421 475 washer Ø 125 10026323 482 washer 10026366 487 washer Ø 60 10026345 509 high limit thermostat 10026982 552 washer Ø 60 10028426 600 combustio...

  • Page 36

    34 section 10 lpg instructions 10.3 converting the appliance gas type to convert the appliance to another gas type it is necessary to change the burner injector and adjust the gas valve. ● ● ● ● ● to change the injector see 6.12.1. ● ● ● ● ● to adjust co2 value see 7.4.1-2-3. 10.4 gas supply the gas...

  • Page 37

    35 10.6.4 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...

  • Page 38

    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...

  • Page 40

    Cod. 10029718 - 05/07 - 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 391 099 f 0844 391 0998 vokèra ireland west court, callan co kilkenny t 05...