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  5. Installation & Servicing Instructions Manual

VOKERA unica he Installation & Servicing Instructions Manual

Manual is about: High efficiency combi boiler

Summary of unica he

  • 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. Unica he high efficiency combi boiler.

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    Contents design principles & operating sequence page 1.1 principle components 3 1.2 mode of operation (at rest) 3 1.3 mode of operation (heating) 3 1.4 mode of operation (hot water) 3 1.5 safety devices 3 technical data page 2.1 central heating 4 2.2 domestic hot water 4 2.3 gas pressures 4 2.4 expa...

  • Page 3

    1 the unica he comprises a range of high-efficiency combination boilers with outputs to dhw of 28kw, 32kw, and 36kw respectively. These appliances – by design – incorporate electronic ignition, circulating pump, expansion vessel, safety valve, pressure gauge, and automatic by-pass. The unica range i...

  • Page 4

    2 fig. 1a mode selector switch red led green led heating temperature selector 2-digit led display hydrometre dhw temperature selector hot water only select this position if you want the boiler to supply hot water only (no heating) boiler at off/standby select this position when you want the boiler t...

  • Page 5

    3 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. • radial aluminium heat exchanger. • ele...

  • Page 6

    4 section 2 technical data 2.1 central heating unica 28he unica 32he unica36he heat input (kw) 20 25 30 maximum heat output (kw) 60/80°c 19.6 24.45 29.31 minimum heat output (kw) 60/80°c 5.9 6.9 6.84 maximum heat output (kw) 30/50°c 21.00 26.30 31.83 minimum heat output (kw) 30/50°c 6.40 7.47 7.41 m...

  • Page 7

    5 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 2,2 2,4 2,6 2,8 3,0 3,2 3,4 3,6 3,8 4,0 4,2 4,4 4,6 4,8 5,0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 fig. 4 key location minimum distance a below an opening (window, air-brick, etc.) 300 mm b above an opening (window, air-brick...

  • 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 3.6.2 automatic by-pass the appliance has a built-in automatic by-pass, consequently there is no requirement for an external by-pass, however the design of the system should be such that it prevents boiler ‘cycling’. 3.6.3 drain cocks these must be located in accessible positions to facilitate dra...

  • Page 10

    8 section 3a general requirements (eire) this appliance must be installed by a competent person in accordance with and defined by, the standard specification (domestic gas installations) declaration (i.S. 813). 3a.1 related documents the installation of this boiler must be in accordance with the rel...

  • Page 11

    9 fig. 6 3a.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...

  • Page 12

    10 section 4 installation fig. 9 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 ...

  • Page 13

    11 fig. 9a 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 9a). Measure dimension y from the terminal end of the concentric flu...

  • Page 14

    12 fig. 11 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/ fixing jig should now be drilled and plug...

  • Page 15

    13 screws – install the air inlet plate (b). • using the hole in the exhaust connection manifold as a guide, drill a 3mm hole in the appliance flue spigot and secure the exhaust manifold connection to the flue spigot using the screw provided (c). • using the two holes in the air inlet plate as a gui...

  • Page 16

    14 fig. 14 fig. 15 4.6 connecting the gas and water important - rear spacer kit if you intend to run the pipe-work vertically behind the appliance, it will be necessary to use the rear spacer kit (part code 435). It will also be necessary to adjust the pitch of the fixing jig to compensate for the i...

  • Page 17

    15 4.6.5 safety valve (fig. 16) connect the safety valve connection pipe to the safety valve outlet. Connect a discharge pipe to the other end of the safety valve connection pipe and tighten. The discharge pipe must have a continuous fall away from the appliance to outside and allow any water to dra...

  • Page 18

    16 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 (i.S. 813 in roi) for specific instruction. 5.2 the heating system the appliance contains components that may become damaged or rendered inop...

  • Page 19

    17 important it’s imperative that a sufficient dynamic – gas – pressure is maintained at all times. Should the dynamic gas pressure fall below an acceptable level, the appliance may malfunction or sustain damage. 5.8 final flushing of the heating system the system shall be flushed in accordance with...

  • Page 20

    18 section 6 servicing instructions 6.1 general to ensure the continued safe and 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 component be r...

  • Page 21

    19 6.6 safety valve (fig. 23) carry out component removal procedure as described in 6.4. Disconnect the outlet pipe (a) from the safety valve, remove safety valve locking pin (b) from the hydraulic manifold. Replace in the reverse order. 6.7 lower automatic air release valve (fig. 22) carry out comp...

  • Page 22

    20 6.14 flue fan & mixer (fig. 28) carry out component removal procedure as described in 6.4. Unclip and remove the air chamber front and the rh side covers. Slacken the gas pipe (a) at the air box connection and swing/rotate away from the fan assembly. Locate and remove the sense electrode. To remo...

  • Page 23

    21 6.17 automatic by-pass & dhw non-return valve (fig. 32) carry out component removal procedure as de- scribed in 6.4. Remove the locking pin (a) that secures the cover (b) to the hydraulic manifold. Using a hooked piece of wire, carefully withdraw the by-pass cartridge (c) and/or dhw non-return ca...

  • Page 24

    22 6.20.2 dhw flow switch (fig. 35a) carry out component removal procedure as described in 6.4. Remove the locking pin (c) . Disconnect and remove the cold water inlet pipe from the dhw flow switch & dhw heat exchanger. Disconnect the wiring to the dhw flow switch. Slacken and unscrew the inlet conn...

  • Page 25

    23 section 7 checks, adjustments and fault finding 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 ens...

  • Page 26

    24 temperature increases, the temperature sensors – located on the flow pipe of the boiler – reduce the fan speed via the electronic circuitr y. Depending on the load, either the water temperature will continue to rise until the set point is achieved or the water temperature will fall whereby fan sp...

  • Page 27

    25 fig. 37 7.4.2 gas valve minimum setting locate and gently turn the htg trimmer till the minimum value fan speed (max) is obtained and check that it corresponds with the appropriate co 2 value (minimum) for the respective appliance. If the co 2 reading is correct, rotate the htg trimmer until the ...

  • Page 28

    26 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. 7.9 fault finding before attempting any faul...

  • Page 29

    27 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 30

    28 functional diagram fig. 38 note: l-n-e connection is advisable f hv fan power supply 230 v f lv fan signal control p pump f fuse 3.15a f (fast) f1-f2 fuse 3.15a t (delay) ope gas valve solenoids s.E. (1) spark electrode s.E. (2) sense electrode c.S. Condensate sensor g.V. Gas valve tsc1 ignition ...

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    29 40 26 12 226 20 21 18 226 90 301 301 300 31 1 78 78 27 section 9 exploded diagrams table 1 28 he 30 he/35 he 40 26 12 226 20 21 18 226 90 301 301 300 31 1 78 78 27 pos. Description 28 he 32 he 36 he 1 frame assembly 01005403 01005446 01005406 12 pressure gauge 2564 2564 2564 18 cover assembly 100...

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    30 288 432 438 265 265 265 201 3 353 366 35 34 62 28 351 328 28 351 328 27 353 366 351 328 61 30 435 288 432 439 1 432 432 47 444 443 48 290 442 6 7 4 435 288 432 441 436 22 63 266 266 26 25 24 201 433 288 2 521 433 201 434 37 438 439 433 9 10 11 12 13 288 432 438 265 265 265 201 3 353 366 35 34 62 ...

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    31 table 3 290 2 201 3 290 2 200 6 66 25 27 372 512 26 7 478 4 247 476 477 477 476 1 287 71 73 72 478 9 200 10 200 17 3 290 2 200 7 6 478 247 2 201 290 200 10 9 287 71 73 72 478 17 66 4 476 477 477 476 200 25 26 27 372 512 200 1 28 he 32 he/36 he pos. Description 28 he 32 he 36 he 1 expansion vessel...

  • Page 34

    32 46 13 200 12 200 15 2 1 27 2 479 16 69 4 5 19 6 35 67 3 72 486 497 39 79 27 500 501 502 600 46 39 2 1 2 479 16 13 200 12 200 15 27 27 69 4 5 19 6 35 67 3 72 486 497 79 500 501 502 600 table 4 28 he 30 he/35 he pos. Description 28 he 32 he 36he 1 roomsealed chamber 10028341 10028447 10028447 2 sid...

  • Page 35

    33 table 5 7 12 487 552 482 475 1 509 600 601 7 12 487 552 482 475 1 509 600 601 28 he 30 he/35 he pos. Description 28 he 32 he 36 he 1 condensing exchanger assembly 01005443 01005366 01005369 7 conveyor 10028536 10028623 10028623 12 flue drain connection 10028421 10028421 10028421 475 washer 100263...

  • Page 36

    34 section 10 lpg instructions 10.1 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 pu...

  • Page 37

    35 important a gas soundness check must be carried out if any gas carrying components have been removed, replaced, or disturbed . Fan speed (rpm) table - lpg model max min htg ign 28he 6100 1700 4300 3700 32he 5900 1500 4500 3700 36he 6300 1400 5200 3700 10.7 appliance fan speeds the appliance fan s...

  • 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 . 1002 8635 - 06 /06 - 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...