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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 the CO

2

 reading is incorrect, the maximum gas 

pressure must be adjusted as follows:

• 

using a 2.5mm Allen key, very slowly turn the maximum ad-

justment screw (see ig. 44) – clockwise to decrease, counter 

clockwise to increase – until the correct value is displayed on 
the CO

2

 analyser (allow time for the analyser to stabilise).

10.6.3 GAS VALVE MINIMUM SETTING

Set the CO

 

button at minimum (see 10.3.1), once the minimum 

is obtained check that it corresponds with the appropriate CO

2

 

value (Minimum) for the respective appliance. If the CO

2

 read-

ing is correct, proceed to completion (10.7.3).
However, if the CO

2

 reading is incorrect, the minimum gas 

pressure must be adjusted as follows:

• 

locate the minimum adjustment screw (ig. 44), 

using a suit-

able screwdriver remove the protection plug 

• 

using a 4mm Allen key, very slowly turn the minimum adjust-

ment  screw  (see  ig.  44)  -  clockwise  to  increase,  counter 

clockwise to decrease - until the correct value is displayed 
on the CO

2

 analyser (allow time for the analyser to stabilise).

10.6.4 COMPLETION

On completion of the combustion analysis check and/or any 

gas valve adjustment, reit the plug 

(L2 

j

and move the mode 

selector to the 

 position.  Remove the test probe from the 

test point and reit the sealing screw/s and/or cap. 

IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY 
GAS CARRYING COMPONENTS HAVE BEEN REMOVED, 
REPLACED OR DISTURBED.

ATTENTION

Gas type and appliance output 

must be set 

according to the 

speciic appliance speciication. Vokèra accepts no responsi

-

bility if the gas type is not correctly adjusted according to the 

respective appliance speciication as detailed on the appliance 

data badge.

Содержание Vision C

Страница 1: ...ctions THESE INSTRUCTIONS TO BE RETAINED BY USER Vok ra is a licensed member of the Benchmark scheme which aims to improve the standards of installation and commissioning of domestic hot water systems...

Страница 2: ...3A 4 Flue system 13 3A 5 Air supply 14 3A 6 Water circulation 14 3A 7 Electrical supply 14 3A 8 Mounting on a combustible surface 14 3A 9 Timber framed buildings 14 3A 10 Inhibitors 14 3A 11 Showers 1...

Страница 3: ...tically Dear Customer Your Vok ra Vision boiler has been designed to meet and exceed the very latest standards in gas central heating technology and if cared for will give years of reliable use and ef...

Страница 4: ...shows the temperature values Pressure gauge shows the current pressure of your heating system the gauge should be set between 1 and 1 5 BAR When the appliance is oper ating the gauge may rise or fall...

Страница 5: ...ADVANCE ON fun ction is active Displayed when the ADVANCE OFF fun ction is active Displays current minutes past the hour Displays current hour of the day 24 hour clock in 30 minute segments lar ge se...

Страница 6: ...y of week setting procedure NOTE the time of day is shown on the display and is also indicated on the 24 segmented display as a lashing segment 1 4 CHANGING THE HEATING PATTERN The built in clock is p...

Страница 7: ...he programmed heating pattern AUTO ON Heating is in an ON period according to the programmed heating pattern MAN OFF Heating is being controlled manually and is switched constantly OFF MAN ON Heating...

Страница 8: ...ow a period of at least two minutes before re setting the appliance 2 6 EXPLANATION OF FEATURES Although the Vok ra Vision has been designed for simplicity of use it utilises the latest in boiler tech...

Страница 9: ...r A01 Ignition failure lame not sensed internal fault Final Reset check appliance operation A02 Limit thermostat fault Final Reset check appliance operation A03 Fan tacho signal fault Final Reset chec...

Страница 10: ...on open vented systems This booklet is an integral part of the appliance It is therefore necessary to ensure that the booklet is handed to the person responsible for the property in which the applianc...

Страница 11: ...nd the boiler will perform a three minute anti cycle timer delay When the request for heat has been satisied the appliance pump and fan may continue to operate to dissipate any residual heat within th...

Страница 12: ...mum system volume 74 litres Pre charge pressure 1 bar 2 5 Dimensions Vision 25C Vision 30C Height mm 715 Width mm 405 Depth mm 248 Dry weight kg 27 28 2 6 Clearances Vision 25C Vision 30C Sides 12mm T...

Страница 13: ...to the roof lashing As determined by the ixed collar of the vertical terminal R To the side of a boundary 300 mm S To the side of an opening or window on a pitched roof 600 mm T Below an opening or w...

Страница 14: ...ansion vessel to accom modate the increased volume of water when the system is heated It can accept up to 8 litres of expansion from within the system generally this is suficient however if the system...

Страница 15: ...itted on a wall of combustible mate rial there is no requirement for a sheet of ireproof material to protect the wall 3 9 TIMBER FRAMED BUILDINGS If the appliance is to be itted in a timber framed bu...

Страница 16: ...An alternative method of illing 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...

Страница 17: ...plane see2 9 Areductionmustalsobemadetothemaximumlength see table below when additional bends are used Reduction for additional bends Bend Reduction in maximum lue length for each bend 45 bend 1 3 me...

Страница 18: ...REAR FLUE ig 15 rear lue outlet only Using the template provided mark and drill a 125mm hole for the passage of the lue pipe The hole should be drilled LEVEL to ensure any condense luid that forms is...

Страница 19: ...ired number of lue extensions or bends up to the maximum equivalent lue length between the boiler and vertical lue assembly see ig 14 Ensure that any horizontal sections of the lue system have a minim...

Страница 20: ...e kit for termination The horizontal terminal is supplied with a built in converter box and cannot be shortened A 130mm hole is required for the passage of the concentric terminal through the wall The...

Страница 21: ...ad can be used for connection to the electrical supply Connect the ly lead to a fused plug or fused isolator in the following way brown wire to LIVE supply blue wire to NEUTRAL supply green yellow to...

Страница 22: ...ectrical supply to the appliance is switched on Ensure any external controls are switched to an ON position and are calling for heat Move the selector switch to the ON position the appliance will now...

Страница 23: ...LY AND IS PROPERLY SECURED ENSURE ALL PIPE WORK IS RE CHECKED FOR TIGHT NESS RE FIT APPLIANCE CASING COMPLETE BENCHMARK CHECKLIST FOR UK ONLY Complete details of the boiler controls installation and c...

Страница 24: ...n the reverse order 6 7 LOWER AUTOMATIC AIR RELEASE VALVE ig 28 Carry out component removal procedure as described in 6 4 Remove the expansion pipe locking pin B from the pump as sembly and remove the...

Страница 25: ...dition taking care to Fig 34 6 13 ELECTRODES ig 34 Carry out component removal procedure as described in 6 4 Remove the air chamber front cover Disconnect the electrode leads and ancillary wiring from...

Страница 26: ...removal procedure as described in 6 4 Remove the locking pin Q1 that secures the cover R1 to the hydraulic manifold Using a hooked piece of wire carefully withdraw the by pass cartridge S1 and or DHW...

Страница 27: ...unscrew the inlet connection Unscrew the nut E2 Lift the DHW low switch housing from its seating If necessary remove the locking pin F2 from the DHW low switch taking care not to lose the loat contain...

Страница 28: ...ow 35 C and 55 C respectively the boiler will ire on minimum 25 power until the primary thermistor exceeds 55 C Thereafter the pump will over run for a period of 30 seconds 7 2 3 HEATING MODE With the...

Страница 29: ...emed as immediately dangerous 7 5 CHECKING THE EXPANSION VESSEL Carry out the component removal procedure as described in 6 4 You must ensure that the boiler is completely drained of water Using a sui...

Страница 30: ...mpletion of any task that required the disconnection and re connection of any electrical wiring or component these checks must be repeated 7 8 FAULT FINDING Before attempting any faultinding the elect...

Страница 31: ...ressed in hundreds e g 25 2 500 rpm GAS VALVE CALIBRATION Connect the boiler to the power supply Open the gas tap Set the function selector to OFF RESET monitor off Remove the screws E remove the casi...

Страница 32: ...st the temperature of the heating system indirectly by changing the required room temperature from between 15 C 25 C this will allow the PCB to recalculate the system temperature required the default...

Страница 33: ...controls manufacturer and or Vok ra technical department should you require more speciic information on the suitability of a particular control Further guidance on the recom mended practice for the in...

Страница 34: ...ssure switch S E Spark electrode TSC2 Ignition transformer 3W 3 way motor F O H T Flow over heat thermostat FS Flue sensor FT Flow thermistor NTC RS Return thermistor NTC brown CN3 blue F Hv 1 2 7 1 C...

Страница 35: ...HE APPLIANCE GAS TYPE To convert the appliance to another gas type it is necessary to change the injector and adjust the gas valve CO2 To change the injector see 6 12 1 Toreplacethelangeonthesilencer...

Страница 36: ...7 3 However if the CO2 reading is incorrect the minimum gas pressure must be adjusted as follows locate the minimum adjustment screw ig 44 using a suit able screwdriver remove the protection plug usi...

Страница 37: ......

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Страница 40: ...ies vokera co uk www vokera co uk www vokera ie Sales General Enquires T 0844 391 0999 F 0844 391 0998 Vok ra Ireland West Court Callan Co Kilkenny T 056 7755057 F 056 7755060 Vok ra Limited reserve t...

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