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VOKERA Excel 25 User Instructions

Manual is about: High efficiency combi boiler

Summary of Excel 25

  • Page 1

    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. Excel high efficiency combi boiler exc...

  • Page 2

    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 getting ...

  • Page 3: Users Instructions

    1 users instructions 1.1 gas appliances gas safety (installations and use) regulations (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 boiler status led green led boiler is working/responding to a heating/hot water request red led boiler has identified a fault and has failed-safe. Refer to instructions on how to reset yellow led service operation dhw temperature selector move the selector clockwise to increase the hot wate...

  • Page 5

    3 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 6

    4 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 7

    5 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 excel comprises a range of high-efficiency combination boilers with outputs to dhw of 25kw and 29kw respectively. These appliances – by design – inc...

  • Page 8

    6 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 9

    7 2.1 central heating excel 25 excel 29 heat input (kw) 20.00 25.00 maximum heat output (kw) 60/80°c 19.50 24.45 minimum heat output (kw) 60/80°c 4.91 5.90 maximum heat output (kw) 30/50°c 20.84 26.23 minimum heat output (kw) 30/50°c 5.36 6.40 minimum working pressure 0.25-0.45 bar maximum working p...

  • Page 10

    8 2.10 efficiency excel 25 excel 29 sedbuk (%) 90.0 90.2 2.11 emissions excel 25 excel 29 co2 @ maximum output (%) 9.0 9.0 co2 @ minimum output (%) 9.5 9.5 co @ maximum output (ppm) 180 160 co @ minimum output (ppm) 20 20 nox rating class 5 class 5 fig. 6 2.12 pump duty fig. 6 shows the flow-rate av...

  • Page 11

    9 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 (installat...

  • Page 12

    10 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 13

    11 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 14

    12 fig. 11 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 wit...

  • Page 15

    13 fig.12a extending the flue connect the bend – supplied with the terminal kit – to the top of the boiler using clamp (supplied) see fig. 11. 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. Co...

  • Page 16

    14 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 the vertical flue assembly to the boiler flue spigot us - ing the 100mm clip, gasket & screws (supplied),...

  • Page 17

    15 • a 130mm hole is required for the passage of the concentric terminal through the ceiling and/or roof. Depending on site conditions it may be preferable to install the terminal assembly prior to fitting the twin flue pipes. Fit the appropriate flashing plate to the roof and insert the ver - tical...

  • Page 18

    16 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 19

    17 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 20

    18 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 21

    19 fig. 20 fig. 21 fig. 22 a b c d e f i j fig. 23 fig. 24 m n i2 j2 g h fig. 25 o p k l 6.4 component removal procedure to remove a component, access to the interior of the appliance is essential. Isolate the appliance from the electrical supply and remove the fuse. And when necessary, close all se...

  • Page 22

    20 6.14 flue fan & mixer (fig. 28-29) carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Locate and remove the gas pipe locking pin ( a1 ) and swing/rotate the gas pipe away from the fan assembly ( b1 ), (if necessary unscrew the gas pipe from the gas valv...

  • Page 23

    21 fig. 29 a1 b1 g1 m1 n1 o1 p1 j1 fig. 30 q1 t1 s1 r1 fig. 32 fig. 31 w1 v1 u1 6.16 main heat exchanger (fig. 29) carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Locate and remove the gas pipe locking pin ( a1 ) and swing/rotate the gas pipe away from ...

  • Page 24

    22 6.20.3 valve actuator (fig. 35) carry out component removal procedure as described in 6.4. Remove the locking pin ( g3 ) that secures the actuator ( h2 ) to the heating manifold. Disconnect the electrical plug from the actuator. Replace in the reverse order. 6.20.4 dhw thermistor (fig. 24) carry ...

  • Page 25

    23 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 ana - lyser. Isolate the appliance from the electrical supply and remove the appliance casing as described in 4.7.1. Restore the electrical supply to the boile...

  • Page 26

    24 fig. 37 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 27

    25 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 28

    26 8.1 external wiring the appliance comes supplied with a time clock to allow opera- tion 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 are not f...

  • Page 29

    27 functional diagram fig. 41 note: l-n-e connection is advisable akl main pcb p1 selector switch and heating potentiometer p2 dhw potentiometer p3 unused p4 unused jp1 unused jp2 unused jp3 unused jp4 unused jp5 unused jp6 unused jp7 unused jp8 closed - unused led led 1 (green) working status or te...

  • Page 30

    28 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 31

    29 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 34

    32 commissioning: co and combustion ratio check co and combustion ratio check first verify that flue integrity has been visually checked in accordance with the “before co and combustion ratio check” box (above) before proceeding to the “check co and combustion ratio at maximum rate” stage. Set boile...

  • Page 36

    Cod. 20066496 - 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 t 0...