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  5. User Instructions

VOKERA Unica i28 User Instructions

Other manuals for Unica i28: User Instructions
Manual is about: High effi ciency combi boiler

Summary of Unica i28

  • Page 1

    40 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. Unica i28 - i32 high efficiency com...

  • Page 2

    38 users instructions things you should know page 1.1 gas appliances 1 1.2 electrical supply 1 1.3 guarantee registration card 1 1.4 appliance log book (uk only) 1 1.5 how does it work? 1 1.6 dimensions 1 1.7 clearances required 1 1.8 frost protection system 1 1.9 appliance status indicators 1 getti...

  • Page 3: Users Instructions

    1 users instructions 1.1 gas appliances gas safety (installation and use) regulation (uk). In the interests of your safety and that of others it is a legal requirement that all gas appliances are installed and correctly maintained by a competent person and in accordance with the latest regulations. ...

  • Page 4

    2 fig. 1 hot water temperature selector move the selector clockwise to increase the hot water outlet temperature, or counter-clockwise to reduce the temperature pressure gauge ensure the system pressure is set correctly (minimum 0.5-bar) mode selector switch/heating temperature selector mode selecto...

  • Page 5

    3 digital display fig. 2 symbol/icon description displayed when heating mode is active displayed when hot water mode is active displayed when frost protection function is ac- tive displayed when hot-water pre-heat function is enabled. Flashes when functioning displayed if an alarm or fault has been ...

  • Page 6

    4 2.1 before switching on before switching the appliance on, please familiarise yourself with: - how to isolate the appliance from the gas, water, and electricity supplies; - how to check and top-up – if necessary – the system water pressure; - the time clock or programmer (if fitted); - any externa...

  • Page 7

    5 4.1 what if i suspect a gas leak if you suspect a gas leak, turn off the gas supply at the gas meter and contact your installer or local gas supplier. If you require further advice please contact your nearest vokèra office. 4.2 what if i have frequently to top-up the system if the system regularly...

  • Page 8

    6 all installers are asked to follow the benchmark scheme by adhering to the code of practise, which can be obtained from www.Centralheating.Co.Uk. The unica comprises a range of high-efficiency combination boilers with outputs to dhw of 28kw and 32kw respectively. These appliances – by design – inc...

  • Page 9

    7 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 • aluminium heat exchanger • electronic ignition with flame supervision • integral high-head...

  • Page 10

    8 section 2 - technical data 2.1 central heating unica 28i unica 32i heat input (kw) 20.00 25.00 maximum heat output (kw) 60/80°c 19.62 24.58 g20 g31 g20 g31 minimum heat output (kw) 60/80°c 2.76 3.95 3,16 4,45 maximum heat output (kw) 30/50°c 21.44 26.70 minimum heat output (kw) 30/50°c 3.00 4.20 3...

  • Page 11

    9 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. 25 mm g...

  • Page 12

    10 section 3 - general requirements (uk) this appliance must be installed by a competent person in ac- cordance 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 (installa...

  • Page 13

    11 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 relevant requirements of the local buildi...

  • Page 14

    12 the terminal must be protected by a guard of durable material. The guard must be fitted centrally over the terminal. Refer to i.S. 813, when the terminal is 0.5 metres (or less) below plastic guttering or 1 metre (or less) below painted eaves. 3a.5 air supply the following notes are intended for ...

  • Page 15

    13 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 contained within the ...

  • Page 16

    14 4.5 fitting the flue the top flue outlet permits both horizontal and vertical flue ap - plications to be considered, alternatively, the vokèra twin flue system can be utilised if longer flue runs are required. 4.5.1 concentric horizontal flue (for concentric vertical fl ue, see 4.5.2). (for twin ...

  • Page 17

    15 extending the flue connect the bend – supplied with the terminal kit – to the top of the boiler using clamp (supplied) see fig. 15. The additional bends & extensions have push-fit connections, care should be taken to ensure that the correct seal is made when assembling the flue system. Connect th...

  • Page 18

    16 4.5.2 concentric vertical flue the appliance can be used with either the vokèra condensing 60/100mm concentric flue system or the optional 80/125mm concentric flue system. Note these instructions relate only to the vokèra condensing 60/100mm concentric flue system. For specific details on the ins...

  • Page 19

    17 note seal the flue terminal assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproof- ing. The interior and exterior trim can now be fitted. Vertical termination (fig. 25) the twin flue system must be converted to the dedicated con - centric flue kit...

  • Page 20

    18 4.6 connecting the gas and water the appliance is supplied with an accessory pack that includes service valves. The service valves are of the compression type. The accessory pack contains sealing washers’ etc, for use with the service valves. When connecting pipe work to the valves, tighten the c...

  • Page 21

    19 5.1 gas supply installation inspect the entire installation including the gas meter, test for tightness 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 22

    20 6.1 general once the appliance has been serviced, the benchmark service record must be completed. For uk only: it is important that the benchmark service record is correctly completed and handed to the user. Failure to install and commission the appliance to the manufacturers instructions will in...

  • Page 23

    21 fig. 30 fig. 31 available to catch any residual water that may drip from the appliance or removed component. Undertake a complete com- missioning check as detailed in section 5, after replacing any component. Always test for gas tightness if any gas carrying components have been removed or distur...

  • Page 24

    22 6 .14 flue fan & mixer (fig. 38-39) carry out component removal procedure as described in 6.4. Unclip and remove the air chamber front and the rh side cov- ers. Slacken the gas pipe (a1) at the air box connection and swing/rotate away from the fan assembly. Locate and remove the sense electrode. ...

  • Page 25

    23 fig. 39 fig. 40 q1 t1 s1 r1 fig. 41 6.16 main heat exchanger (fig. 39) 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. 36: slacken the gas pipe ( l1 ) at the air box connec...

  • Page 26

    24 p2 fig. 46 fig. 44 fig. 43 e2 f2 g2 h2 i2 n2 o2 m2 l2 fig. 45 a2 b2 c2 d2 l2 m2 6.20 flue collector removal (fig. 43) carry out component removal procedure as described in 6.16. Locate and remove the screw ( a2 ) that secures the flue gas analysis test point cover ( b2 ). Remove the clip and the ...

  • Page 27

    25 7.3 checking the co 2 and adjusting the gas valve the gas valve must be set-up or adjusted with the aid of a properly calibrated flue gas analyser. Isolate the appliance from the electrical supply and remove the appliance casing as described in 4.7.1. Set the flue gas analyser to read co 2 and in...

  • Page 28

    26 fig. 47 7.3.2 gas valve maximum setting set the co 2 button at maximum (see 7.3.1), once the maximum is obtained check that it corresponds with the appropriate co 2 value (maximum) for the respective appliance (see 2.11). If the co 2 reading is correct, proceed to gas valve minimum setting (7.3.3...

  • Page 29

    27 the fault. A visual inspection of components may also assist in locating the fault. 7.7.3 polarity check with the appliance connected to the electrical supply and us- ing a suitable multimeter, carry out the following voltage tests: • connect test leads between the live & neutral connections at t...

  • Page 30

    28 alarm code cause alarm type action _st autostop final call landlord _cl call for service temporary then final call landlord a01 ignition failure, flame not sensed, internal fault final reset, check appliance operation a02 limit thermostat fault final reset, check appliance operation a03 fan tacho...

  • Page 31

    29 7.10 adjustments the boiler has already been adjusted by the manufacturer during production. If the adjustments need to be made again, for example after extraordinary maintenance, replacement of the gas valve, or conversion from methane gas to lpg, ob- serve the following procedures. The adjustme...

  • Page 32

    30 the boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional flue gas emission limits it is, however, possible to modify this value, referring to the graphs below. Cos.A. Curve (qnheating) heat output (kw) htg curve (qnheating) heat outpu...

  • Page 33

    31 7.11 alarm records the “alarm records” function starts automatically once the display has been on for 2 hours, or immediately by setting the p1 parameter to 1. The records include all the latest alarms, up to a maximum of 5 alarms, and they are displayed in sequence by pushing and releasing the p...

  • Page 34

    32 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 35

    33 functional diagram fig. 51 brown cn3 blue f hv 1 2 7 1 cn9 w.P.S. 2 3 1 d.H.W.T. White white red red violet (+) orange(−) f.M. Blue (out) 3 1 orange(−) blue (out) violet (+) 3w 2 n 1 d.H.W. 3 heat black brown blue 3 1 cn4 akl jp1 jp2 jp3 jp4 jp5 jp6 jp7 jp8 p4 p3 p2 p1 cn13 cn14 f1 3.15a t cn12 c...

  • Page 36

    34 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 purposes bs 6798 installation ...

  • Page 37

    35 10.6.2 gas valve maximum setting set the co button at maximum (see 10.3.1), once the maximum is obtained check that it corresponds with the appropriate co 2 value (maximum) for the respective appliance. If the co 2 read- ing is correct, proceed to gas valve minimum setting (10.7.2). However, if t...

  • Page 39

    37.

  • Page 40

    39 cod. 20038660 - 07/13 - ed. 3 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 ...