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2. 25 00 29 50 Flow Rate AT35 C 10 2 l min 12 1 l min Maximum inlet pressure 6 bar Minimum inlet pressure 0 15 bar Minimum flow rate 2 l min 2 3 Gas Pressures Compact 25 Compact 29 Inlet pressure G20 20 0 mbar Heating maximum gas rate m hr 2 12 2 64 DHW maximum gas rate m hr 2 64 3 12 Minimum gas rate m hr 0 53 0 63 Injector size mm 4 8 5 7 Silencer flange mm fitted 27 31 2 4 Expansion Vessel Compact 25 Compact 29 Capacity 8 litres Maximum system volume 74 litres Pre charge pressure 1 bar 2 5 Dimensions Compact 25 Compact 29 Height mm 715 Width mm 405 Depth mm 248 Dry weight kg 30 32 2 6 Clearances COMPACT Range Sides 12mm Top 150mm from casing or 25mm above flue elbow whichever is applicable Bottom 150mm Front 500mm 2 7 Connections COMPACT Range Flow amp return 22mm Gas 22mm DHW hot amp cold 15mm Safety valve 15mm Condense 21mm 2 8 Electrical Compact 25 Compact 29 Power consumption Waits 123W 140W Voltage V Hz 230 50 Internal fuse 3 15A T for PCB 3 15A F for connections block External fuse 3A 2 9 Flue Details concentric Compact 25 Compact 29 Maximum horizontal flue length 60 100mm 4 0m Maximum vertical flue length 60 100mm 5 0m 2 9A Flue Details twin pipes Compact 25 Compact 29 Maximum horizontal flue length 80mm 80mm 20m 20m Maximum vert
3. CO minimum output 10 5 10 5 CO maximum output ppm 200 170 CO minimum output ppm 35 35 10 3 CONVERTING THE APPLIANCE GAS TYPE To convert the appliance to another gas type it is necessary to change the injector and adjust the gas valve CO e To change the injector see 6 12 1 e To insert the flange on the silencer only Compact 29 see 6 15 e To adjust CO2 values see 10 6 10 4 GAS SUPPLY The gas supply must be connected to the appliance by a competent LPG installer and must be of sufficient size to supply the appliance at its maximum output An existing supply must be checked to ensure that it is of adequate size to deal with the maximum rated input of this and any other appliances that it serves 10 5 GAS SUPPLY INSTALLATION The entire installation including the meter must be purged and checked for gas tightness 10 6 1 CO FUNCTION SETTINGS Locate the CO button see 7 3 Select the main selector switch in position 0 10 6 CHECKING THE CO 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 and insert the probe into the flue analysis test point Y1 Z1 fig 33 Restore the electrical supply to the boiler and switch the boiler to the OFF mode Have access to the printed circuit b
4. exceeding 2 litres per minute will activate the DHW flow switch whereupon the pump and fan will be activated via the flow temperature sensor When the fan is sensed to be operating correctly tacho signal the ignition sequence commences Ignition is sensed by the electronic circuitry to ensure flame stability at the burner Once successful ignition has been achieved the electronic circuit allows the gas rate to achieve the modulation value NOTE When the request for heating and or hot water has been satisfied the appliance pump and fan may continue to circulate to dissipate any residual heat within the appliance ATTENTION Gas type and appliance output must be set according to the specific appliance specification Vok ra accepts no responsibility if the gas type is not correctly adjusted according to the respective appliance specification as detailed on the appliance data badge 7 3 CHECKING THE CO 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 and insert the probe into the flue analysis test point Y1 Z1 fig 33 Restore the electrical supply to the boiler and switch the boiler to the OFF mode Have access to the printed circuit board locate and open the closing plug on the dash board L2 locate and press
5. to the heating manifold Disconnect the electrical plug from the actuator Replace in the reverse order 6 20 4 DHW THERMISTOR fig 24 Carry out component removal procedure as described in 6 4 Locate and remove the thermistor locking pin I2 Gently ease the thermistor assembly J2 from the hydraulic manifold Replace in the reverse order 6 20 5 DIVERTOR VALVE ASSEMBLY fig 35 Carry out component removal procedure as described in 6 4 Remove the valve actuator as described in 6 20 3 Locate and remove the locking pin G2 that secures the valve hous ing cover to the hydraulic manifold Gently prise the valve assembly from the manifold K2 Replace in the reverse or der ensuring that the seating assembly is inserted properly Ensure all seals are in good condition taking care to ensure they are replaced correctly 22 Fig 33 Fig 34 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 ensure gas tightness water tightness and the electrical integrity of the appliance 7 2 APPLIANCE MODES OF OPERATION NOTE There must be sufficient system water pressure min 0 5 bar to ensure the water pressure switch is activated If there is ins
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7. 1 5 SAFETY DEVICES When the appliance is in use safe operation is ensured by e a water pressure switch that monitors system water pressure and will de activate the pump fan and burner should the system water pressure drop below the rated tolerance e fan speed sensor to ensure safe operation of the burner e ahigh limit thermostat that over rides the temperature control circuit to prevent or interrupt the operation of the burner e flame sensor that will shut down the burner when no flame signal is detected e flue sensor e a safety valve which releases excess pressure from the primary circuit Top AAV Main heat LI exchanger UOC Flowtemperature ip 84 D l f C A Ho b Return temperature Expansion sensor vessel d Bottom Pressure DHW AAV switch nQ temperature H DHW heat A cy exchanger nonreturn N TS valve Pump Dt E CEF Safety K Rp valve T d T Diverter valve Y Automatic by pass Drain valve Flow regulator DHW flow switch CH CH DHW DHW Fig 5 return flow outlet inlet SECTION 2 TECHNICAL DATA 2 1 Central Heating Compact 25 Compact 29 Heat input kW 20 00 25 Maximum heat output kW 60 80 C 19 50 24 40 Minimum working pressure 0 5 bar Maximum working pressure 2 7 bar Minimum flow rate 350 l h 2 2 Domestic Hot Water Compact 25 Compact 29 Heat input kW
8. REMOVAL fig 20 Locate the 4 screws and remove air box front cover 6 5 PUMP ASSEMBLY fig 21 Carry out component removal procedure as described in 6 4 Disconnect and remove the pump outlet pipe A from the pump assembly combustion chamber connection Remove the expansion pipe locking pin B from the top of the pump assembly and withdraw the flexible pipe Locate and remove the pressure gauge securing pin C and disconnect the pressure gauge from the pump assembly Disconnect the electrical wiring from the pump s electrical connection point D Locate and remove the 2 securing screws E at the rear of the pump assembly Remove locking pin F from pump base and lift pump assembly clear of the hydraulic manifold The pump assembly can now be removed from the appliance Replace carefully in the reverse order 6 6 SAFETY VALVE fig 22 Carry out component removal procedure as described in 6 4 Disconnect the outlet pipe G from the safety valve remove safety valve locking pin H from the hydraulic manifold Replace in the reverse order 6 7 LOWER AUTOMATIC AIR RELEASE VALVE fig 21 Carry out component removal procedure as described in 6 4 Remove the expansion pipe locking pin B from the pump assembly and remove the expansion pipe Locate and remove the AAV locking pin 1 from the pump assembly and remove the AAV assembly J Replace in the reverse order 6 7 1 TOP AUTOMATIC AIR RELEASE VALVE fig 23 Carry out com
9. appliance in a room or internal space containing a bath or shower When an appliance is installed in a room or internal space containing a bath or shower the appliance or any control pertaining to it must not be within reach of a person using the bath or shower The location chosen for the appliance must permit the provision of a safe and satisfactory flue and termination The location must also permit an adequate air supply for combustion purposes and an adequate space for servicing and air circulation around the appliance Where the installation of the appliance will be in an unusual location special procedures may be necessary BS 6798 gives detailed guidance on this aspect A compartment used to enclose the appliance must be designed and constructed specifically for this purpose An existing compartment cupboard may be utilised provided that it is modified to suit Details of essential features of compartment cupboard design including airing cupboard installations are given in BS 6798 This appliance is not suitable for external installation 3 3 GAS SUPPLY The gas meter as supplied by the gas supplier must be checked to ensure that it is of adequate size to deal with the maximum rated input of all the appliances that it serves Installation pipes must be fitted in accordance with BS 6891 Pipe work from the meter to the appliance must be of adequate size Pipes of a smaller size than the appliance gas inlet connection must not be
10. automatically 2 4 ADJUSTING THE HEATING TEMPERATURE Rotate the temperature selector clockwise to increase counter clockwise to decrease to the desired temperature setting The temperature can be set from a minimum of 40 C to a maximum of 80 C if standard CH mode is selected 2 5 ADJUSTING THE HOT WATER TEMPERATURE Rotate the temperature selector clockwise to increase counter clockwise to decrease to the desired temperature setting The temperature can be set from a minimum of 37 C to a maximum of 60 C If the temperature at the outlet is still not sufficiently hot enough it may be necessary to reduce the flow of water at the hot water outlet tap NOTE If the appliance fails to ignite during the ignition sequence it will enter a lockout condition Should this occur please allow a period of at least two minutes before re setting the appliance 2 6 EXPLANATION OF FEATURES Although the Vok ra Compact has been designed for simplicity of use it utilises the latest in boiler technology enabling a host of functions to be carried out simultaneously 2 7 AUTOMATIC TEMPERATURE CONTROL The automatic temperature control function SARA permits the boiler when the heating temperature selector is set within 4 and 6 sector to automatically adjust raise the heating The activation and the disable of the function is visualized by blinking the green led 3 3 HOW TO SHUT DOWN THE SYSTEM FOR SHORT PERIODS The syst
11. bracket for each extension e The entire flue system must be adequately insulated to maintain heat within the flue system thereby reducing the possibility of condensate production e As the exhaust outlet pipe can reach very high temperatures it must be protected to prevent persons touching the hot surface e The condensate drain pipe must be connected in accordance with building regulations Reduction for bends Once the bracket has been secured to the wall mount the appliance onto the bracket INSTALLATION OF TWIN ADAPTOR KIT fig 12 amp 13 e Insert the exhaust connection manifold A onto the appliance flue outlet e Remove the blanking plate located to the left of the appliance flue outlet and using the same screws install the air inlet plate B e 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 e Using the two holes in the air inlet plate as a guide drilla 3mm hole in each and secure the air inlet pipe bend using the screws provided The twin flue pipes extensions and accessories can now be installed by pushing together the plain end of each extension or bend should be pushed approximately 50mm into the female socket of the previous piece Fig 12 Fig 13 Bend Reduction in
12. converter ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter If necessary cut the plain ends male of the twin flue pipes to allow connection to the concentric to twin converter NOTE e Before cutting twin flue pipes ensure allowances have been made for connection onto the previous piece and onto the concentric to twin converter The last twin flue pipes must be pushed 50mm onto the male spigots of the concentric to twin converter e You must ensure that the entire flue system is properly supported and connected e Ensure that any horizontal sections of pipe have a 1 fall towards the appliance 17mm per 1000mm 4 6 CONNECTING THE GAS AND WATER The appliance is supplied with an accessory pack that includes service valves The service valves are for welding The accessory pack contains sealing washers etc for use with the service valves NOTE It will be necessary to hold the valve with one spanner whilst tightening with another 4 6 1 GAS fig 16 The appliance is supplied with a 22mm service valve connect a 22mm pipe to the inlet of the valve and tighten both nuts NOTE It will be necessary to calculate the diameter of the gas supply pipe to ensure the appliance has an adequate supply of gas 4 6 2 FLOW amp RETURN fig 16 The appliance is supplied with 22mm service valves for the flow and return connections connect a 22mm pipe to the inlet of each valve and t
13. full bore to remove any installation debris from the boiler prior to lighting Refill the boiler and heating system as described in 5 3 5 5 PRE OPERATION CHECKS Before attempting the initial lighting of the appliance the following checks must be carried out e ensure all gas service valves from the meter to the appliance are open and the supply pipe has been properly purged e ensure the proper electrical checks have been carried out see 7 8 particularly continuity polarity and resistance to earth e ensure the 3 AMP fuse supplied with the appliance has been fitted e ensure the system has been filled vented and the pressure set to 1 BAR e ensure the flue system has been fitted properly and in accordance with the instructions e ensure all appliance service valves are open 5 6 INITIAL LIGHTING Ensure the electrical 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 operate as described in 1 2 Should the appliance fail to ignite refer to 5 6 and or section 7 mode of operation parameter setting amp faultfinding 5 7 CHECKING GAS PRESSURE AND COM BUSTION ANALYSIS The appliance is factory set and requires no additional adjustment once installed However to satisfy the requirements of GSIUR 26 9 I S 813 ROI it will be necessary to gas rate the ap
14. must ensure that the entire flue system is properly supported and connected Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing The interior and exterior trim can now be fitted Fig 10 Using the dimensions given in fig 12 as a reference mark and cut a 125mm hole in the ceiling and or roof 130mm a ASS Fig 15 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 should now be drilled and pluggea 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 13 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 using the 100mm clip gasket amp screws supplied ensuring the correct seal is made The flue support bracket supplied with the vertical flue kit can now be fitted If the vertical flue requires extension s o
15. the fan assembly out of its location Once the assembly has been removed the burner K1 can be withdrawn from the heat engine Ensure the seals L1 is in good condition taking care to ensure it is replaced correctly Replace in the reverse order 20 Fig 27 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 the fan assembly B1 if necessary unscrew the gas pipe from the gas valve G1 Disconnect the electrical connec tions attached to the fan Disconnect the electrode leads and ancillary wiring from their respective connectors Disconnect the flow locking pin M1 return locking pin N1 on the heat exchanger Locate and remove the 5 screws that secure the heat exchanger to the combustion chamber 01 Move the heat exchanger and disconnect it from the flue collector P1 The heat exchanger can now be lifted up and withdrawn from the appliance Replace in the reverse order Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 17 AUTOMATIC BY PASS amp DHW NON RE TURN VALVE fig 30 Carry out component 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
16. valves until the individual return temperatures are correct and are approximately equal 5 11 1 REGULATING THE DHW FLOW RATE The appliance is fitted with a flow rate restrictor that limits the maximum flow rate that can be drawn through the appliance The restrictor eliminates the need to manually adjust the DHW flow rate However if it is felt necessary to further increase or decrease the available flow rate spare restrictors are available to Vok ra spare parts The spare flow rate restrictors can be fitted to either increase or decrease the maximum flow rate 5 11 2 FLOW RATE RESTRICTOR The boiler is supplied with the following flow restrictor Compact 25 8 litres flow restrictor Compact 29 10 litres flow restrictor 5 12 FINAL CHECKS e ENSURE ALL TEST NIPPLES ON THE APPLIANCE GAS VALVE ARE TIGHT AND CHECKED FOR TIGHTNESS e ENSURE THE APPLIANCE FLUE SYSTEM IS FITTED CORRECTLY AND IS PROPERLY SECURED e ENSURE ALL PIPE WORK IS RE CHECKED FOR TIGHTNESS e RE FIT APPLIANCE CASING e COMPLETE BENCHMARK CHECKLIST FOR UK ONLY Complete details of the boiler controls installation and commissioning in the Benchmark checklist at the back of this book It is important that the Benchmark checklist is correctly completed and handed to the user Failure to install and com mission the appliance to the manufacturers instructions may invalidate the warranty 5 13 INSTRUCTING THE USER Hand over all documentation supplied wi
17. visually check the condition of the entire flue assembly e Compare the results with the appliance design specification Any deterioration in performance must be identified and rectified without delay e Check that the burner and main heat exchanger are clean and free from any debris or obstruction e Check and clean if necessary the condense trap to ensure correct operation 6 3 REPLACEMENT OF COMPONENTS Although it is anticipated that this appliance will give years of reliable trouble free service the life span of components will be determined by factors such as operating conditions and usage Should the appliance develop a fault the fault finding section will assist in determining which component is malfunctioning 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 service valves on the appliance remove the appliance casing as described in section 4 7 1 and drain the water content from the appliance via the drain valve Ensure some water absorbent cloths are available to catch any residual water that may drip from the appliance or removed component Under take a complete commissioning check as detailed in section 5 after replacing any component ALWAYS TEST FOR GAS TIGHTNESS IF ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED OR DISTURBED 6 4 1 AIR BOX FRONT COVER
18. 0028603 R10028603 3 Pump R10027571 R10027571 7 Pipe 20025763 20025763 8 Exchanger assembly 20025765 20026081 9 Pipe 20025764 20025764 10 Pipe 20025744 20025744 17 Air vent valve 20019768 20019768 25 Siphon 20025733 20025733 27 Pipe 20025743 20025743 34 Degasser kit 20019888 20019888 60 Racord 20025762 20025762 66 Flexible pipe R10027545 R10027545 71 Pipe 20025746 20025746 72 Vent plug R10023235 R10023235 73 Cock R10028431 R10028431 200 Washer R5023 R5023 288 Ring R6898 R6898 290 Clip R2165 R2165 302 Washer R5025 R5025 370 Oring R10023533 R10023533 371 Clip R10023532 R10023532 432 Clip R10024958 R10024958 619 Pressure 20003181 20003181 624 Clip R5472 R5472 625 High limit thermostat 20005585 20005585 633 Water detector 20003819 20003819 668 Clip 20019767 20019767 Table 4 DESCRIPTION Fan Burner assembly Ignition electrode Pipe Gas valve Gas pipe 3 4 gas cock Combustion chamber cover Plug Hole cover Seal ignition electrode Gas diaphragm Pipe Mixer Washer Electrode Suction pipe Diaphragme Washer Clip Ignition transformer Washer 25 20002995 20026061 20025737 20025745 20025752 20005553 R2266 20005594 20005550 20005586 20025740 R10025461 20025757 20025761 20025753 20025738 20025760 20026051 R5023 R10025062 20001563 20025747 29 20002995 20
19. 026079 20025737 20025745 20025752 20005553 R2266 20005594 20005550 20005586 20025740 R10029209 20025757 20026083 20025753 20025738 20025760 20026082 R5023 R10025062 20001563 20025747 31 Table 5 75 686 POS 12 20 26 75 370 487 552 637 686 700 32 DESCRIPTION Conveyor Flue drain connection Outlet nut Plug Flue cllector O ring Washer Y 60 Washer Y 60 Flue sensor Washer Combustion cable 25 20026060 R10028421 20026049 20026058 20026056 R10023533 R10026345 R10028426 20007050 20026059 20025736 29 20026060 R10028421 20026049 20026058 20026056 R10023533 R10026345 R10028426 20007050 20026059 20025736 SECTION 10 LPG INSTRUCTIONS 10 1 RELATED DOCUMENTS BS 5440 PARTS 1 4 2 FLUES amp VENTILATION REQUIREMENTS BS 5449 PART 1 FORCED CIRCULATION OF HOT WATER SYSTEMS BS 5482 PART 1 DOMESTIC BUTANE amp PROPANE GAS BURNERS IN PERMAMENT DWELLINGS BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW 10 2 TECHNICAL DATA Gas Pressures Compact 25 Compact 29 Inlet pressure 37 0 mbar 37 0mbar Heating maximum gas rate kg hr 1 55 1 94 DHW maximum gas rate kg hr 1 94 2 29 Minimum gas rate kg hr 0 39 0 47 Injector size 3 6 mm 4 4mm Silencer flange 27 mm fitted 29 mm CO maximum output 10 0 10 0
20. 2 5 Adjusting the hot water temperature 3 5 7 Checking gas pressure amp combustion analysis 17 2 6 Explanation of features 3 5 8 Final flushing of the heating system 17 2 7 Automatic temperature control 3 5 9 Setting the boiler operating temperature 17 5 10 Setting the system design pressure 17 How to Page 5 11 Regulating the central heating system 18 3 1 How to top up the system pressure 3 5 12 Final checks 18 3 2 How to reset the appliance 3 5 13 Instructing the user 18 3 3 How to shut down the system for short periods 3 3 4 How to shut down the system for long periods 3 Servicing Page 3 5 How to care for the appliance 3 6 1 General 18 6 2 Routine annual servicing 18 What if Page 6 3 Replacement of components 18 4 1 What if suspect a gas leak 4 6 4 Component removal procedure 18 4 2 What if have frequently top up the system 4 6 5 Pump assembly 19 4 3 What if the appliance is due its annual service 4 6 6 Safety valve 19 4 4 What if T need to call an engineer 4 6 7 Lower automatic air release valves 19 6 8 Water pressure switch 19 Setting the Vok ra Page 6 9 Flow thermistor 19 5 1 Setting the Vok ra mechanical clock 4 6 10 Return thermistor 19 6 11 Printed circuit board 19 Installation and Servicing instructions 6 12 Gas valve 20 Design principles amp operating sequence Page 6 13 Electrodes 20 1 1 Principle components 6 6 14 Flue fan mixer 20 1 2 Mode of operation at rest 6 6 15 Burner 20 1 3 Mode of operation heating 6 6 16 Ma
21. 21 433 438 37 700 DESCRIPTION Exchanger Connection Non return valve By pass casing Heating by pass valve 3 way heating manifold and cartridge Cartridge Actuator Clip Safety valve Flow governor Pipe Dhw actuator 3 4 heat water cock Pipe Pipe Water supply stop cock Pipe Cover for by pass assembly Cock Pipe Pipe Washer Washer Ring Clip Pump plug Clip Clip Nipple Fitting union Clip O ring Washer Clip O ring O ring Washer NTC sensor Washer Hydraulic control cable 25 R8036 R10030114 R10025056 R10024641 20007783 20021496 20017597 20017594 20017598 R10025055 R10026043 20011423 R10022349 R1592 20025758 20025756 R1888 R10025840 R10024643 R10024646 20025757 20025755 R5023 R5026 R6898 R2165 R2216 R10024958 R10024986 R10024985 R10025059 R10025062 R10024988 R10025067 R10025063 R10025065 R10025064 R10025066 R10027351 R5038 20017596 29 R8037 R10030114 R10025056 R10024641 20007783 20021496 20017597 20017594 20017598 R10025055 R10024987 20011423 R10022349 R1592 20025758 20025756 R1888 R10025840 R10024643 R10024646 20025757 20025755 R5023 R5026 R6898 R2165 R2216 R10024958 R10024986 R10024985 R10025059 R10025062 R10024988 R10025067 R10025063 R10025065 R10025064 R10025066 R10027351 R5038 20017596 29 Table 3 72 a a POS DESCRIPTION 25 29 1 Expansion vessel 20024419 20024419 2 Pipe R1
22. 3 e Insert the flue gas analyser probe into the flue gas test point see fig 33 e Operate the boiler in combustion analysis mode see 7 3 1 and compare the values with those shown in section 2 Nat Gas or section 10 LPG If different adjust the gas valve according to 7 3 1 7 3 2 amp 7 3 3 Note An existing boiler with a measured CO CO ratio of 0 004 1 or less can be deemed as operating satisfactorily with a measured CO CO ratio of greater than 0 004 1 can be deemed as at risk with a measured CO CO ratio of greater than 0 008 1 can be deemed 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 suitable pressure gauge remove dust cap on expansion vessel and check the charge pressure The correct charge pressure should be 1 0 bar 0 1 bar If the charge 24 j j outlet gas compensation pipe pressure connection connection maximum minimum S adjustment adjustment A screw screw G internal gas O valve pressure So connection Ae As Cl O jl inlet gas pressure connection S fig 37 pressure is less use a suitable pump to increase the charge NOTE You must ensure the drain valve is in the open position whil
23. 3A 2 LOCATION OF APPLIANCE The appliance may be installed in any room or internal space although particular attention is drawn to the requirements of the current ETCI National Rules for Electrical Installations and I S 813 Annex K When an appliance is installed in a room or internal space containing a bath or shower the appliance or any control pertaining to it must not be within reach of a person using the bath or shower The location chosen for the appliance must permit the provision of a safe and satisfactory flue and termination The location must also permit an adequate air supply for combustion purposes and an adequate space for servicing and air circulation around the appliance Where the installation of the appliance will be in an unusual location special procedures may be necessary refer to l S 813 for detailed guidance on this aspect Acompartment used to enclose the appliance must be designed 10 and constructed specifically for this purpose An existing compartment cupboard may be utilised provided that it is modified to suit This appliance is not suitable for external installation 3A 3 GAS SUPPLY The gas meter as supplied by the gas supplier must be checked to ensure that it is of adequate size to deal with the maximum rated input of all the appliances that it serves Installation pipes must be fitted in accordance with LS 813 Pipe work from the meter to the appliance must be of adequate size Pipes of a smal
24. 5 min Heating OFF hysterisis C SP 5 Heating ON hysterisis C SP 5 DHW OFF hysterisis C SP 5 DHW ON hysterisis C SP 4 Anti cycle delay 3 min Pump over run 30 sec Low output min output Min 25 CO function max temp C 90 CO re light temp C 78 CO function time 15 min Flow NTC max temp C 90 High limit thermostat C 105 Flue NTC max temp C 125 Maximum differential C 35 IGNITION CONTROL VALUE Ignition attempts before L O lockout 5 Re ignition attempts after loss of flame signal 5 APPLIANCE STATUS LED AND FAULT CODES When the boiler detects a temporary fault condition the appropriate led indication is shown If when the fault is final the pump will perform a 60 second post circulation and rel LED will be illuminated See table on pag 4 25 SECTION 8 WIRING DIAGRAMS 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 dia grams For advice on controls that are not featured in this book please contact Vok ra technical on 0844 391 0999 8 1 1 EXTERNAL WIRING LIMITATIONS Any external wiring must remain within the limits as detailed room thermostat 30 metres 8 2 TYPICAL CONTROL APPLICATIONS The appliance can be used with the following controls single channel v
25. THINGS YOU SHOULD KNOW 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 1 2 ELECTRICAL SUPPLY Please ensure that this appliance has been properly con nected to the electrical supply by means of a double pole isolator or un switched socket and that the correct size of fuse 3 AMP has been fitted Warning this appliance must be earthed 1 3 GUARANTEE REGISTRATION CARD Please take the time to fill out your guarantee registration card The completed warranty card should be posted within 30 days of installation 1 4 APPLIANCE LOG BOOK UK only A logbook section can be found at the rear of the appliance installation booklet This important document must be completed during the installation commissioning of your boiler All GAS SAFE registered installers carry a GAS SAFE ID card and have a registration number These details should be recorded in the Benchmark logbook section within the installation booklet You can check your installers details by calling GAS SAFE direct on 08004085500 Failure to install and commission the appliance in accordance with the manufacturers instructions may invalidate the warranty This does not affect your statutory rights 1 5 HOW DOES IT WORK Your Compact boiler su
26. Vokera heating for life Compact A High efficiency combi boiler Users Instructions Installation amp Servicing Instructions CE THESE INSTRUCTIONS TO BE RETAINED BY USER Users instructions Things you should know Page Installation Page 1 1 Gas appliances 1 4 1 Delivery 12 1 2 Electrical supply 1 4 2 Contents 12 1 3 Guarantee registration card 1 4 3 Unpacking 12 1 4 Appliance Log Book UK only 1 4 4 Preparation for mounting the appliance 12 1 5 How does it work 1 4 5 Fitting the flue 12 1 6 Dimensions 1 4 6 Connecting the gas amp water 15 1 7 Clearances required 1 4 7 Electrical connections 16 1 8 Frost protection system 1 1 9 Appliance status indicators 1 Commissioning Page 5 1 Gas supply installation 17 Getting started Page 5 2 The heating system 17 2 1 Before switching ON 3 5 3 Initial filling of the system 17 2 2 Appliance controls 3 5 4 Initial flushing of the system 17 2 3 Lighting the boiler 3 5 5 Pre operation checks 17 2 4 Adjusting the heating temperature 3 5 6 Initiallighting 17
27. al i e they should ensure that the level of the pH in the system water remains neutral Premature failure of certain components can occur if the level of pH in the system water is out with normal levels 5 8 1 INHIBITORS See Section 3 General Requirements 5 9 SETTING THE FLOW OUTLET TEMPERA TURE The flow outlet temperature can be adjusted between 40 C 80 C for standard CH system by using the Heating thermostat knob see fig 1 5 9 1 SETTING THE DHW OUTLET TEMPERATURE The DHW outlet temperature can be adjusted between 37 C 60 C via the DHW thermostat knob see fig 1 5 10 SETTING THE SYSTEM DESIGN PRESSURE The design pressure should be a minimum of 0 5 BAR and a maximum of 1 5 BAR The actual reading should ideally be 1 BAR plus the equivalent height in metres 0 1 BAR 1 metre 17 to the highest point in the system above the base of the appliance up to the maximum of 1 5 BAR total N B The safety valve is set to lift at 3 BAR 30 metres 45 psig To lower the system pressure to the required value drain off some water from the appliance drain valve until the required figure registers on the pressure gauge see fig 1 5 11 REGULATING THE CENTRAL HEATING SYSTEM Fully open all radiator and circuit valves and run the appliance for both heating and hot water until heated water is circulating If conditions are warm remove any thermostatic heads Adjust radiator return valves and any branch circuit return
28. appliance Call engineer if fault re occurs Boiler stand by NA OFF OFF BLINKING None 4 WHAT IF 4 1 WHAT IF 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 Vok ra office 4 2 WHAT IF HAVE FREQUENTLY TO TOP UP THE SYSTEM If the system regularly requires topping up it may be indicative of a leak Please contact your installer and ask him to inspect the system 4 3 WHAT IF THE APPLIANCE IS DUE ITS AN NUAL SERVICE Advice for tenants only Your landlord should arrange for servicing 5 SETTING THEVOKERA 5 1 SETTING THE VOKERA MECHANICAL CLOCK If your boiler has been installed with the Vok ra mechanical clock it can be used and adjusted as follows Setting the time The time of day can be set by grasping the outer edge of the black dial and turning it in a clockwise direction until the cor rect time is in line with the white pointer Setting the switching times The ON periods are set by sliding the black tappets adja cent to the time periods required to the outer edge of the dial The tappets that remain at the centre of the dial will be the OFF periods The smallest switching time ON or OFF is 15 minutes To select AUTO mode move the selector switch in central position To select ON mode move the selector sw
29. bilise 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 value Minimum for the respective appliance If the CO reading is correct proceed to completion 10 7 3 However if the CO reading is incorrect the minimum gas pressure must be adjusted as follows e locate the minimum adjustment screw fig 37 remove the protection plug using a TX 15 key Torx key e using a TX 15 key Torx key very slowly turn the minimum adjustment screw see fig 37 clockwise to increase counter clockwise to decrease until the correct value is displayed on the CO 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 refit the plug L2 j and move the mode selectorto the 4 position Remove the test probe from the test point and refit 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 specific appliance specification Vok ra accepts no responsibility if the gas type is not correctly adjusted according to the respective appliance specification as detailed on the appliance data badge 34 This Commissioning Checklist is to be completed in full by the competen
30. bly into the flue hole Push fit the twin flue pipes onto the concentric to twin converter box ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter If necessary cut the plain ends male of the twin flue pipes to allow connection to the concentric to twin converter NOTE Before cutting twin flue pipes ensure allowances have been made for connection onto the previous piece and onto the concentric to twin converter The last twin flue pipes must be pushed 50mm onto the male spigots of the concentric to twin converter NOTE Seal the flue terminal assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing The interior and exterior trim can now be fitted VERTICAL TERMINATION fig 15 The twin flue system must be converted to the dedicated concentric flue kit for termination e The vertical terminal is supplied with a built in converter box and cannot be shortened e 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 vertical flue terminal through the flashing plate from the outside ensuring that the collar on the flue terminal fits over the flashing Push fit the twin flue pipes onto the concentric to twin
31. by pass cartridge S1 and or DHW non return cartridge T1 Ensure all seals are in good condition taking care to ensure they are replaced correctly Replace in the reverse order ensuring the cartridge is facing the correct way 6 18 EXPANSION VESSEL REMOVAL fig 31 Carry out component removal procedure as described in 6 4 Disconnect the expansion vessel from the flexible expansion pipe Disconnect the flexible expansion pipe from the vessel Unscrew the nut that secures the vessel to the lower frame Locate and remove the screw U1 that secure the vessel to the top The expansion vessel can now be removed Replace in the reverse order Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 19 CONDENSE TRAP REMOVAL fig 32 Carry out component removal procedure as described in 6 4 Disconnect the the locking pin V1 that secures the trap to the air condense pipe Disconnect the lower rubber condense pipe from the condense trap Carefully remove the condense trap For cleaning unlock the upper and lower closing plug W1 Replace in the reverse order 21 6 20 FLUE COLLECTOR REMOVAL fig 33 Carry out component removal procedure as described in 6 4 Remove the air chamber front cover Remove the heat exchanger as per 6 16 Locate and remove the screw Y1 that secures the flue gas analysis test point cover Z1 Disconnect the flues the
32. control knobs are correctly aligned with the respective potentiometers on the PCB Ensure that the correct jumper tag configuration has been respected It will be necessary to check the functioning of the PCB is set for the correct boiler type application Fig 21 Fig 22 6 12 GAS VALVE fig 26 Carry out component removal procedure as described in 6 4 The gas valve must be changed as complete unit Disconnect the electrical plug and leads from the gas valve slacken and unscrew gas valve inlet and outlet connections Please note the sealing washers Q must be discarded and replaced with new sealing washers Disconnect the compensation pipe R Unscrew gas pipe connections S T the gas valve can now be removed Replace in the reverse order Check and adjust burner pressure settings WARNING A GAS TIGHTNESS CHECK MUST BE CARRIED OUT 6 12 1 INJECTOR fig 26 Carry out component removal procedure as described in 6 4 Unscrew and remove gas pipe connections S T Locate and remove the injector U inside the pipe Replace in the reverse order Check and adjust burner pressure settings WARNING A GAS TIGHTNESS CHECK MUST BE CARRIED OUT 6 13 ELECTRODES fig 27 Carry out component removal procedure as described in 6 4 Remove the air chamber front cover Disconnect the electrode leads and ancillary wiring from their respective connectors Remove the retaining screw
33. e person and also to the gas supplier if required 11 SECTION 4 INSTALLATION 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 carton is e the boiler e the wall bracket e carton template e an accessories pack containing appliance service connections and washers e the instruction pack containing the installation servicing amp user instructions guarantee registration card and a 3 amp fuse 4 3 UNPACKING At the top of the carton pull both sides open do not use a knife unfold the rest of the carton from around the appliance carefully remove all protective packaging from the appliance and lay the accessories etc to one side Protective gloves should be used to lift the appliance the appliance back frame should be used for lifting points 4 4 PREPARATION FOR MOUNTING THE AP PLIANCE The appliance should be mounted on a smooth vertical non combustible surface which must be capable of supporting the full weight of the appliance Care should be exercised when determining the position of the appliance with respect to hidden obstructions such as pipes cables etc When the position of the appliance has been decided using the template supplied carefully mar
34. e Vok ra spare part It should be remembered that although certain generic components may look similar they will be specific to an individual appliance or product range Use of non genuine Vok ra spare parts could invalidate your warranty and may pose a potential safety hazard The frequency of servicing will depend upon the particular installation conditions but in general once per year should be sufficient It is the law that any servicing work is carried out by competent person such as a Vok ra engineer an approved service agent British Gas GAS SAFE registered personnel or other suitably qualified personnel The following instructions apply to the appliance and its controls but it should be remembered that the central heating and the domestic hot water systems would also require attention from time to time 6 2 ROUTINE ANNUAL SERVICING e Check the operation of the appliance and ensure it functions as described in section 7 e Compare the performance of the appliance with its design specification The cause of any noticeable deterioration should be identified and rectified without delay e Thoroughly inspect the appliance for signs of damage or deterioration especially the flue system and the electrical apparatus e Check and adjust if necessary all burner pressure settings see 7 4 e Check and adjust if necessary the system design pressure see 5 10 18 e Carry out an analysis of the flue gases see 7 5 and
35. e controls include pressure gauge appliance mode selector temperature selector burner ON mode green fault indicator red servicing mode indicator yellow optional integral time clock programmer if fitted NOTE The appliance frost protection is active in all the boiler modes The temperature selectors can be used to vary the temperature of the water that circulates around your radiators and the water that flows from your hot water taps The temperature range is adjustable between 40 C and 80 C for the central heating and between 37 C and 60 C for the hot water The 3 LED normally shows the operating temperature of the appliance When the status indicator Green is lit it indicates that the flame is present and the burner is ON When the fault indicator Red is lit it indicates that the appliance has identified a possible fault and performed a safety lockout When the fault indicator Yellow is lit it indicates that there is a Servicing operation in progress The integral time clock when fitted can be used to switch the heating on and off at pre determined intervals 3 HOWTO 3 1 HOW TO TOP UP THE SYSTEM PRESSURE fig 1 2 The system pressure must be checked periodically to ensure the correct operation of the boiler The needle on the gauge should be reading between 1 and 1 5 BAR when the boiler is in an off position and has cooled to room temperature If the pressure requires t
36. e previously drilled hole Fit the flue bend to the boiler flue outlet and insert the concentric flue pipe into the flue bend ensuring the correct seal is made Using the clamp gasket and screws supplied secure the flue bend to the appliance flue spigot NOTE Fit the internal white trim to the flue assembly prior to connecting the flue pipe to the bend Youmustensure thatthe entire flue system is properly supported and connected Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory weather proofing The exterior trim can now be fitted 4 5 2 CONCENTRIC VERTICAL FLUE The appliance can be used with either the Vok ra condensing 60 100mm concentric flue system or the optional 80 125mm concentric flue system NOTE These instructions relate only to the Vok ra condensing 60 100mm concentric flue system For specific details on the installation of the 80 125mm concentric flue system please refer to the instructions supplied The vertical flue terminal can be connected directly to the appliance flue outlet Alternatively an extension or bend can be connected to the appliance flue outlet if desired however if additional bends are fitted a reduction must be made to the maximum flue length see table below Reduction for bends Bend Reduction in maximum flue lengt
37. em and boiler can be shut down for short periods by simply turning the time clock to the off position It is also advisable to turn off the main water supply to the house 3 4 HOW TO SHUT DOWN THE SYSTEM FOR LONG PERIODS If the house is to be left unoccupied for any length of time especially during the winter the system should be thoroughly drained of all water The gas water and electricity supply to the house should also be turned off For more detailed advice contact your installer 3 5 HOW TO CARE FOR THE APPLIANCE To clean the outer casing use only a clean damp cloth Do not use any scourers or control Fig 2 i abrasive valve Get cleaners y temporary valve connection flow return double A pipe check valve supply pipe APPLIANCE STATUS LED AND FAULT CODES Alarm type LedRED LedYELLOW Led GREEN Action Purge cycle mode active NA BLINKING BLINKING BLINKING Alarm high limit thermostat Final BLINKING OFF OFF Reset appliance Call engineer if fault re occurs Alarm system water pressure Final ON OFF ON Check refill system pressure reset check Call engineer if fault re occurs Alarm safety shutdown and or Final ON OFF OFF Reset appliance Call internal fault engineer if fault re occurs Temporary fault Temporary OFF OFF BLINKING None Service operation NA OFF BLINKING OFF None Flame ON NA OFF OFF ON None Fault sensors Final BLINKING OFF BLINKING Reset
38. en fitted DOMESTIC HOT WATER MODE Measure and Record Gas Rate Burner Operating Pressure at maximum rate Cold Water Inlet Tempera Hot water has been checked at all outlets Water Flow Rate CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer s instructions and or BS5546 BS6798 Yes ALL INSTALLATIONS If required by the manufacturer record the following of l on col lem on corco maiol_ The heating and hot water system complies with the appropriate Building Regulations veel _ The boiler and associated products have been installed and commissioned in accordance with the manufacturer s instructions ves The operation of the boiler and system controls have been demonstrated to and understood by the customer veel The manufacturer s literature including Benchmark Checklist and Service Record has been explained and left with the customer veel Commission ineer s Customer s Signature To conr m satisfactory demonstration and receipt of manufacturer s literature SERVICE 1 Date Energy Efficiency Checklist co H Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 3 Date Efficiency Checklist co l Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 5 Date Em Efficiency Checklist co H Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Commen
39. ends pair N A 29450125 500mm extension 500mm 12 29450126 1000mm extension 1000mm 29450127 2000m extension 2000mm 29450128 Telescopic extension 350 730mm 529 Wall bracket pack 5 208mm Using the template provided A mark and drill a 125mm hole for the passage of the flue pipe The hole should be drilled to ensure any condense fluid that forms is allowed to drain back to the appliance see fig 12 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 TS Ee wu e S Fig 10 Outer clamps Fig 11 FITTING THE TELESCOPIC HORIZONTAL FLUE KIT In some instances It may necessary to cut the inner 60mm pipe of the flue bend at the point indicated fig 13 pos A to allow for easier insertion to the boiler flue spigot 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 12 Measure dimension Y from the terminal end of the concentric flue pipe and cut off the excess ensuring any burrs are removed Pass the concentric flue pipe through th
40. h for each bend 45 bend 0 5 metre 90 bend 1 0 metre Vertical flue terminal and accessories Part No Description Length 29450122 Vertical flue terminal 1000mm 531 Pitched roof flashing plate N A 532 Flat roof flashing plate N A 29450123 90 degree bend N A 29450124 45 degree bends pair N A 29450125 500mm extension 500mm 29450126 1000mm extension 1000mm 29450127 2000mm extension 2000mm 29450128 Telescopic extension 350 730mm 529 Wall bracket pack 5 208mm p ue 1 t i E pra emm OS timm sl Y T S JE E Se e 1 3 degree 0 degree Fig 12 X 65mm Y E y S A Fig 13 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 A extensions have push fit connections care should be taken to ensure that the correct seal is made when assem bling the flue system Connect the required number of flue extensions or bends up to the maximum equivalent flue length to the flue terminal see fig 11 14 The flue system should have a minimum of 1 maximum of 3 rise from the boiler to outside to ensure any condense fluid that forms is allowed to drain back to the appliance NOTE When cutting an extension to the required length you must ensure that the excess is cut from the plain end of the extension see fig 11 14 Remove any burrs and check that all seals are located properly You
41. hangers is used to protect the boiler and system from the effects of corrosion and or electrolytic action The inhibitor must be administered in strict accordance with the manufacturers instructions Water treatment of the complete heating system including the boiler should be carried out in accordance with BS 7593 and the Domestic Water Treatment Association s DWTA code of practice 3 11 SHOWERS If the appliance is intended for use with a shower the shower must be thermostatically controlled and be suitable for use with a combination boiler control valve d control 4 emporary valve connection f A f double A flow return ES pipe check valve supply Fig 8 pipe Make up vessel or tank Automatic 5 air vent E gt gt lt Non return Stopcock 2 valve E D Heating j return Fig 9 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 1 S 813 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 should be in accordance also with any relevant requirements of the local and or district authority
42. ibed in 4 7 1 identify the automatic air release valves AAV and loosen the dust cap s by turning the cap anti clockwise one full turn Ensure all manual air release valves located on the heating system are closed Connect the filling loop as shown in fig 5 slowly proceed to fill the system by firstly opening the inlet valve connected to the flow pipe and then turning the lever on the fill valve to the open position As water enters the system the pressure gauge will begin to rise Once the gauge has reached 1 BAR close both valves and begin venting all manual air release valves starting at the lowest first It may be necessary to go back and top up the pressure until the entire system has been filled Inspect the system for water tightness rectifying any leaks 5 3 1 MANUAL AIR RELEASE fig 19 When the boiler has been filled for the first time or the system has been drained and refilled it will be necessary to release any air that may have become trapped within the appliance heat exchanger Slacken the bleed screw until water is released and then close IMPORTANT THERE ARE NO OTHER MANUAL AIR RELEASE VALVES LOCATED ON THE APPLIANCE Fig 19 5 4 INITIAL FLUSHING OF THE SYSTEM The whole of the heating system must be flushed both cold and hot as detailed in 5 8 Open all radiator or heating valves and the appliance flow amp return service valve Drain the boiler and system from the lowest points Open the drain valve
43. ical flue length 80mm 80mm 20m 20m 2 10 Efficiency Compact 25 Compact 29 SEDBUK 90 0 90 1 2 11 Emissions Compact 25 Compact 29 CO maximum output 9 0 9 0 CO minimum output 9 5 9 5 CO maximum output ppm 200 160 CO minimum output ppm 30 35 NOx rating class 5 class 5 2 12 PUMP DUTY Fig 6 shows the flow rate available after allowing for pressure loss through the appliance for system requirements When usingthis graph apply only the pressure loss ofthe system The graph is based on a 20 C temperature differential Fig 6 Residual head x 100 mbar 1000 1100 Fig 7 A bi lt E lt A10I OUTZZENCAC ITIOTMUOOU gt Location Below an opening window air brick etc Above an opening window air brick etc To the side of an opening window air brick etc Below gutter drain pipe etc Below eaves Below balcony car port roof etc To the side of a soil drain pipe etc From internal external corner Above ground roof or balcony level From a surface or boundary facing the terminal From a terminal facing a terminal From an opening in the car port into the building Vertically from a terminal on the same wall Horizontally from a terminal on the same wall From a structure to the side of the vertical terminal From the top of the vertical terminal to the roof flashing To the side of a boundary To the side of an opening or window on a p
44. ighten both nuts NOTE Depending on system requirements it may necessary to increase the size of the flow amp return pipe work after the service valve connections 4 6 3 COLD WATER INLET fig 16 The appliance is supplied with a 15mm combined stopcock and double check valve connect a 15mm pipe to the inlet of the stopcock and tighten both nuts 4 6 4 HOT WATER OUTLET fig 16 The appliance is supplied with a 15mm outlet connection connect a 15mm pipe to the outlet connection and tighten both nuts WS Fig 14 1 deg 17mm yu 1 0 metre Fig 15 e I 15 Hot water outlet Cold water inlet stopcock filling valve C H flow valve C H return valve Fig 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 drain away thereby eliminating the possibility of freezing The discharge pipe must terminate in a position where any water possibly boiling discharges safely without causing damage or injury but is still visible 4 6 6 CONDENSE PIPE During normal operation the boiler produces condense which is collected in a trap located in the lower part of
45. in heat exchanger 21 1 4 Mode of operation Hot water 6 6 17 Automatic by pass amp DHW non return valve 21 1 5 Safety devices 6 6 18 Expansion vessel removal 21 6 19 Condense trap removal 21 Technical data Page 6 20 Flue collector removal 22 2 1 Central heating 7 A eT 2 2 Domestic hot water 7 Checks adjustments and fault finding Page 2 3 Gas pressures 7 7 1 Checking appliance operation 23 2 4 Expansion vessel 7 7 2 Appliance modes of operation 23 2 5 Dimensions 7 7 3 Checking the CO amp adjusting the valve 23 26 Clearances 7 7 4 Combustion analysis test 24 2 7 Connections 7 7 5 Checking the expansion vessel 24 5 8 Electrical 7 7 6 External faults 24 2 9 Flue details concentric 7 7 7 Electrical checks 24 2 9A Flue details twin pipes 7 7 8 Fault finding ES 25 2 98 Flue details 80 125 7 7 9 Component values 8 characteristics 25 2 10 Efficiency 7 211 Emissions 7 Wiring diagrams Page 2 12 Pump duty 8 8 1 External wiring 26 8 2 Typical control applications 26 General requirements UK Page 8 3 Other devices 26 3 1 Related documents 9 8 4 Vok ra twin channel programmer 26 3 2 Location of appliance 9 3 3 Gas supply 9 Exploded diagrams Page 3 4 Flue system 9 a Se 3 5 Air suppl 9 e 3 6 Water circulation 9 a SE a a 3 7 Electrical suppl 10 3 8 Mounting ona combustible surface 10 9 5 Table 5 32 ae Te anea buildings Bros dt Page 10 1 elated documents 33 E 19 10 2 Technical data 33 General requirements EIRE Page 10 3 Converting
46. ions and in Scotland the electrical provisions of the Building Regulations with respect to the people have access including balconies or flat roofs the terminal must be protected by a guard of durable material The guard must be fitted centrally overthe terminal Referto BS 5440 Part 1 when the terminal is 0 5 metres or less below plastic guttering or 1 metre or less below painted eaves 3 5 AIR SUPPLY The following notes are intended for general guidance only This appliance is a room sealed fan flued boiler consequently it does not require a permanent air vent for combustion air supply When installed in a cupboard or compartment ventilation for cooling purposes is also not required 3 6 WATER CIRCULATION Detailed recommendations are given in BS 5449 Part 1 and BS 6798 The following notes are for general guidance only 3 6 1 PIPEWORK It is recommended that copper tubing to BS 2871 Part 1 is used in conjunction with soldered capillary joints Where possible BS 5440 PART 1 FLUES BS 5440 PART 2 FLUES amp VENTILATION BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW BS 6891 LOW PRESSURE INSTALLATION PIPES BS 7074 PART 1 APPLICATION SELECTION AND INSTALLTION OF EXPANSION VESSELS AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS installation of the
47. itch in the bottom position To select OFF mode move the selector switch in the upper position Advice for homeowners Please contact Vok ra Customer Service 0844 3910999 UK or 056 7755057 ROI if you would prefer a Vok ra service engineer or agent to service your appliance Alternatively your local GAS SAFE registered engineer may be able to service the appliance for you 4 4 WHAT IF NEED TO CALL AN ENGINEER If you think your boiler may have developed a fault please contact your installer or Vok ra Customer Services 0844 3910999 UK or 056 7755057 ROI have all your details to hand including full address and postcode relevant contact numbers and your completed appliance log book Fig 3 INSTALLATION AND SERVICING INSTRUCTIONS INTRODUCTION The Compact comprises a range of high efficiency combination boilers with outputs to DHW of 25kW and 30kW respectively These appliances by design incorporate electronic ignition circulating pump expansion vessel safety valve pressure gauge and automatic by pass The Compact range is produced as room sealed category II2H3P appliances suitable for internal wall mounting applications only Each appliance is provided with a fan powered flue outlet with an annular co axial combustion air intake that can be rotated horizontally through 360 degrees for various horizontal or vertical applicatio
48. itched roof Below an opening or window on a pitched roof From a vertical terminal to an adjacent opening window air brick etc From a vertical terminal to an adjacent vertical terminal Minimum distance 300 mm 300 mm 300 mm 25 mm 25 mm 25 mm 25 mm 60mm for 80 125 5 flue 25 mm 60mm for 80 125 5 flue 300 mm 600 mm 1200 mm 1200 mm 1500 mm 300 mm 300 mm As determined by the fixed collar of the vertical terminal 300 mm 600 mm 2000 mm call Vokera technical for advice 300 mm only if both terminals are the same hight SECTION 3 GENERAL REQUIREMENTS UK This appliance must be installed by a competent person in accordance with the Gas Safety Installation amp Use Regulations 3 1 RELATED DOCUMENTS The installation of this boiler must be in accordance with the relevant requirements of the Gas Safety Installation amp Use Regulations the local building regulations the current LEE wiring regulations the bylaws of the local water undertaking the Building Standards Scotland Regulation and Building Standards Northern Ireland Regulations It should be in accordance also with any relevant requirements of the local authority and the relevant recommendations of the following British Standard Codes of Practice 3 2 LOCATION OF APPLIANCE The appliance may be installed in any room or internal space although particular attention is drawn to the requirements of the current LE E wiring regulat
49. k the position of the wall mounting bracket see fig 10 and flue hole if applicable 4 5 FITTING THE FLUE The top flue outlet permits both horizontal and vertical flue applications to be considered alternatively the Vok ra twin flue system can be utilised if longer flue runs are required 4 5 1 CONCENTRIC HORIZONTAL FLUE For concentric vertical flue see 4 5 2 For twin flue applications see 4 5 3 The appliance can be used with either the Vok ra condensing 60 100mm concentric flue system or the optional 80 125mm concentric flue system NOTE These instructions relate only to the Vok ra condensing 60 100mm concentric flue system For specific details on the installation of the 80 125mm concentric flue system please refer to the instructions supplied The appliance flue outlet elbow can be rotated through 360 on its vertical axis In addition the flue may be extended from the outlet elbow in the horizontal plane see 2 9 A reduction must also be made to the maximum length see table below when additional bends are used Reduction for additional bends Bend Reduction in maximum flue length for each bend 45 bend 0 5 metre 90 bend 1 0 metre Horizontal flue terminals and accessories Part No Description Length 29450120 Horizontal flue kit 900mm 29450121 Telescopic flue kit 350 530mm 522 Plume management kit 1370mm 29450123 90 degree bend N A 29450124 45 degree b
50. ld water inlet Toon SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE 1 1 PRINCIPLE COMPONENTS e Afully 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 pump Fan Expansion vessel Water pressure switch Flue sensor Pressure gauge Safety valve 1 2 MODE OF OPERATION at rest When the appliance is at rest and there are no requests for heating or hot water the following functions are active e frost protection system the frost protection system protects the appliance against the risk of frost damage both for CH and DHW For CH line if the main temperature falls to 5 C the appliance will function on minimum power until the temperature on main reaches 35 C Moreover if the DHW temperature falls to 5 C the appliance will function on minimum power until the temperature on main reaches 55 C e anti block function the anti block function enables the pump and divertor valve actuator to be energised for short periods when the appliance has been inactive for more than 24 hours 1 3 MODE OF OPERATION Heating When there is a request for heat via the time clock and or any external control the pump and fan are started the fan speed will modulate until the correct signal voltage is received at the co
51. ler size than the appliance gas inlet connection must not be used The installation must be tested for tightness in accordance with I S 813 If the gas supply serves more than one appliance it must be ensured that an adequate supply is maintained to each appliance when they are in use at the same time 3A 4 FLUE SYSTEM The terminal should be located where the dispersal of combustion products is not impeded and with due regard for the damage and discoloration that may occur to building products located nearby The terminal must not be located in a place where it is likely to cause a nuisance see I S 813 In cold and or humid weather water vapour will condense on leaving the terminal the effect of such pluming must be considered If installed less than 2m above a pavement or platform to which people have access including balconies or flat roofs the terminal must be protected by a guard of durable material The guard must be fitted centrally over the terminal Referto 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 general guidance only This appliance is a room sealed fan flued boiler consequently it does not require a permanent air vent for combustion air supply When installed in a cupboard or compartment ventilation for cooling purposes is also not required 3A 6 WATER CIRCULATION Specific recomme
52. liance 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 system where air is likely to be trapped They should be used to expel trapped air and allow complete filling of the system 3 6 5 EXPANSION VESSEL The appliance has an integral expansion vessel to accommodate 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 sufficient however if the system has an unusually high water content it may be necessary to provide additional expansion capacity see 6 18 3 6 6 FILLING POINT A method for initial filling of the system and replacing water lost during servicing etc directly from the mains supply is provided see fig 8 This method of filling complies with the current Water Supply Water Fittings Regulations 1999 and Water Bylaws 2000 Scotland If an alternative location is preferred it should be connected as detailed in fig 8 3 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 9 The cold feed from the make up vessel or tank must be fitted 9 with an approved non return valve and stopcock for is
53. lied with a permanent 230V electrical supply e Always remove the link between TA A TA on the CN5 PCB terminal see fig 39 e The room thermostat connection is low voltage 24 Vdc e Do not connect any controls or auxiliary equipment to the low voltage terminal strip other than that approved supplied by Vok ra Ltd 26 IN UMOJQ IN aniq MECHANICAL CLOCK RADIO FREQUENCY RECEIVER 230 V Fuse 3 15A F M3 y aaa tr fh oook 86 CN5 J s Fig 39 e 24 Vdc 0 2 4 1 e no si E e o 3 D C z So Fuse 3 15A F M3 G aa ag aa ely 29 315 CNS a Fig 40 FUNCTIONAL DIAGRAM ion is advisable L N E connect NOTE Fig 41 OPA pz ressounayy WOO SNO SIOJP9UUOD GLNO LNO 1 ver sna Josues ewe uoyng uogoun ZOD dos lesodua Jo snjejs Bumuom uab pa7 Jajawopuajod Bulyeay pue yms Joie Cl Y aponoaja ydg OLN JojsiuJey unay SH
54. low pipe of the boiler reduce the fan speed via the electronic circuitry 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 speed will increase relative to the output required When the boiler has reached the set point hysterisis the burner will switch off The built in anti cycle device prevents the burner from re lighting for approximately 3 minutes When the temperature of the flow sensor falls below the set point hysterisis the burner will re light NOTE If the spark sensing electrode does not sense ignition the appliance will re attempt ignition a further 4 times then go to lockout When the set point has been reached the position of the heating temperature selector as measured at the primary thermistor the appliance will begin the modulation phase whereby the fan and gas valve will continuously modulate to maintain the set point If the temperature continues to rise and exceeds the set point by 5 C hysterisis the burner will shut down A new ignition sequence will be enabled when the 3 minute anti cycle has been performed and the temperature at the primary thermistor has dropped 5 C hysterisis below the set point 7 2 4 DHW MODE With the selector switch in either the hot water only or heating amp hot water position the appliance will operate in the hot water mode whenever a DHW outlet is opened A flow rate
55. maximum flue length for each bend 45 bend 1 0 metre 90 bend 1 0 metre Twin flue accessories Part No Description Length 0225805 Horizontal flue terminal 1 0 metre 0225810 Vertical flue terminal 1 0 metre 359 Twin adapter kit N A 531 Pitched roof flashing plate N A 532 Flat roof flashing plate N A 0225815 Condensate drain kit N A 0225820 0 25m extension pair 250mm 0225825 0 5m extension pair 500mm 0225830 1 0m extension pair 1000mm 0225835 2 0m extension pair 2000mm 0225840 45 bend pair N A 0225845 90 bend pair N A 0225850 Twin bracket 5 N A 0225855 Single bracket 5 N A 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 14 HORIZONTAL TERMINATION fig 14 The twin flue system must be converted to the dedicated concentric flue kit for termination e The horizontal terminal is supplied with a built in converter box and cannot be shortened e A 130mm hole is required for the passage of the concentric terminal through the wall e The air inlet pipe must always be level with or below that of the exhaust pipe Depending on site conditions it may be preferable to install the terminal assembly prior to fitting the twin flue pipes Mark and drill a level 130mm hole for the passage of the horizontal flue terminal Insert the terminal assem
56. mmer Heating temperature selector move the selector clockwise to increase the heating outlet temperature or counter clockwise to reduce the temperature range 40 C 80 C for standard central heating The automatic temperature control function SARA is set within position 4 and 6 Boiler at OFF standby Select this position when you 4 USA want the boiler to be switched off for short periods days or if the boiler requires to be reset a 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 operating the gauge may rise or fall slightly this is quite normal The minimum permissible level for the safe and efficient operation of the appliance is 0 5 BAR Should the pressure fall below 0 5 BAR the boiler may lockout correct pressure value 2 GETTING STARTED 2 1 BEFORE SWITCHING ON Before switching the appliance on please familiarise yourself with how to isolate the appliance from the gas water and elec tricity supplies how to check and top up if necessary the system water pressure the time clock or programmer if fitted any external thermostats and their functions the appliance controls 2 2 APPLIANCE CONTROLS see fig 1 The appliance controls are situated on the lower front of the appliance The applianc
57. mp will be activated for a period of 30 seconds e ACTUATOR ANTI BLOCK FUNCTION when there has been no heating or HW request for 24 hours the anti block cycle is activated The divertor valve actuator will motor briefly to the heating position and then back to the DHW position The pump will run briefly e SARA function the SARA function permits the boiler when the set point is within the SARA range to automatically adjust raise the heating flow outlet temperature should the room thermostat contacts remain closed for more that 20 minutes 7 2 3 HEATING MODE With the selector switch in the heating amp hot water position and any additional controls time clock programmer room thermostat etc calling for heat the appliance will operate in the heating mode The pump and fan will be activated via the flow temperature sensor When the fan is sensed to be operating correctly tacho signal the ignition sequence commences Ignition is sensed by the electronic circuit to ensure flame stability at the burner Once successful ignition has been achieved the electronic circuitry increases the gas rate to 75 for a period of 15 minutes The speed of the fan and therefore the output of the boiler is determined by the temperature of the water sensed by the flow temperature sensor consequently a high temperature at the flow sensor results in a lower fan speed As the water temperature increases the temperature sensors located on the f
58. ndations are given in I S 813 The following notes are for general guidance only 3A 6 1 PIPEWORK It is recommended that copper tubing be used in conjunction with soldered capillary joints Where possible pipes should have a gradient to ensure air is carried naturally to air release points and that water flows naturally to drain cocks Except where providing useful heat pipes should be insulated to avoid heat loss and in particular to avoid the possibility of freezing Particular attention should be paid to pipes passing through ventilated areas such as under floors loft space and void areas 3A 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 3A 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 3A 6 4 AIR RELEASE POINTS These must be positioned at the highest points in the system where air is likely to be trapped They should be used to expel trapped air and allow complete filling of the system 3A 6 5 EXPANSION VESSEL The appliance has an integral expansion vessel to accommodate 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 sufficient however if the system has an u
59. nect the supply cable wires LIVE NEUTRAL amp EARTH to their corresponding terminals L N amp E on the appliance high voltage terminal block When connecting the EARTH wire ensure that it s left slightly longer that the others this will prevent strain on the EARTH wire should the cable become taut Do not remove the link wire unless additional external controls are to be fitted see section 8 The securing screw on the cable anchorage should now be tightened This must be done before the terminal block cover is re fitted in its position NOTE It is the installer s responsibility to ensure that the appliance is properly Earthed Vok ra Ltd cannot be held responsible for any damages or injuries caused as a result of incorrect Earth wiring Fig 17 A Fig 18 SECTION 5 COMMISSIONING 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 debris that are residual from the installation of the system consequently it is essential that the system be flushed in accordance with the following instructions 5 3 INITIAL FILLING OF THE SYSTEM Ensure both flow and return service valves are open remove appliance casing as descr
60. ns The Compact can also be used with the Vok ra twin flue system The Compact is approved for use with C13 amp C33 type flue applications These appliances are designed for use with a sealed system only consequently they are not intended for use 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 appliance is located installed A replacement copy can be obtained from Vok ra customer services N H U NN q YN Y Y ES WEE _ _ Q __ mo_o o mum ESRA Ss EE eeu NS TEY a gt I I el Fig 4 3 General layout Domestic hot water heat exchanger Drain valve Three porte valve actuator Safety valve Pump Bottom auto air vent AAV Main heat exchanger Flues thermistor NTC 9 Fan assembly with mixer 10 Silencer 11 Flue gas analysis test point 12 Flue outlet amp air intake 13 Top AAV 14 De aerator 15 Spark Electrode Sensing Electrode 22 16 Ignition transformer 17 Flow thermistor NTC High limit thermostat 18 Expansion vessel 19 Pressure switch 20 Return thermistor NTC 24 21 Gas valve 22 Domestic hot water sensor 23 Condense trap 24 DHW flow switch O 01 P O N 20 21 23 Heating return connection Heating flow connection Gas connection Hot water outlet Co
61. ntrol PCB At this point an ignition sequence is enabled Ignition is sensed by the electronic circuit to ensure flame stability at the burner Once successful ignition has been achieved the electronic circuitry increases the gas rate to 75 for a period of 15 minutes Thereafter the boiler s output will either be increase to maximum or modulate to suit the set requirement When the appliance reaches the desired tem perature the burner will shut down and the boiler will perform a three minute anti cycle timer delay When the request for heat has been satisfied the appliance pump and fan may continue to operate to dissipate any residual heat within the appliance 1 4 MODE OF OPERATION Hot water When there is a request for DHW via a hot water outlet or tap the pump and fan are started the fan speed will modulate until the correct signal voltage is received at the control PCB At this point an ignition sequence is enabled Ignition is sensed by the electronic circuit to ensure flame stability at the burner Once successful ignition has been achieved the electronic circuitry increases the gas rate to maximum or will modulate output to stabilise the temperature In the event of the appliance exceeding the desired temperature set point the burner will shut down until the temperature drops When the request for DHW has been satisfied the appliance pump and fan may continue to operate to dissipate any residual heat within the appliance
62. nusually high water content it may be necessary to provide additional expansion capacity see 6 18 3A 6 6 FILLING POINT A method for initial filling of the system and replacing water lost during servicing etc is provided see fig 8 You should ensure this method of filling complies with the local water authority regulations 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 9 The cold feed from the make up vessel or tank must be fitted with an approved non return valve and stopcock for isolation purposes The feed pipe should be connected to the return pipe as close to the boiler as possible 3A 6 8 FREQUENT FILLING Frequent filling or venting of the system may be indicative of a leak Care should be taken during the installation of the appliance to ensure all aspects of the system are capable of withstanding pressures up to at least 3 bar 3A 7 ELECTRICAL SUPPLY The appliance is supplied for operation on 230V 50Hz electrical supply it must be protected with a 3 amp fuse The method of connection to the mains electricity supply must allow for complete isolation from the supply The preferred method is by using a double pole switch with a contact separation of at least 3 5 mm 3 high voltage category The switch must onl
63. oard locate and open the closing plug on the dash board L2 fig 36 locate and press the CO button see fig 36 pos SW1 The appliance will now operate in CO mode for approximately 15 minutes CO FUNCTIONS ACTION ON THE BUTTON LED STATUS combustion analysis mode press once burner running at maximum heating yellow led blinking gas valve maximun setting press twice burner running at maximum DHW yellow led blinking red led fixed gas valve minimum setting press three time burner running at minimum yellow led blinking green led fixed NOTE 1 Any additional pressing of CO button after the third time the burner switched between maximum DHW and minimum 2 To restart the CO function it is necessary to pass throught the 0 position with the main selector switch 33 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 value Maximum for the respective appliance If the CO reading is correct proceed to gas valve minimum setting 10 7 2 However if the CO reading is incorrect the maximum gas pressure must be adjusted as follows e using a TX 15 key Torx key very slowly turn the maximum adjustment screw see fig 37 clockwise to increase counter clockwise to decrease until the correct value is displayed on the CO analyser allow time for the analyser to sta
64. olation purposes The feed pipe should be connected to the return pipe as close to the boiler as possible 3 6 8 FREQUENT FILLING Frequent filling or venting of the system may be indicative of a leak Care should be taken during the installation of the appliance to ensure all aspects of the system are capable of withstanding pressures up to at least 3 bar 3 7 ELECTRICAL SUPPLY The appliance is supplied for operation on 230V 50Hz electrical supply it must be protected with a 3 amp fuse The method of connection to the mains electricity supply must allow for complete isolation from the supply The preferred method is by using a double pole switch with a contact separation of at least 3 5mm 3 high voltage category The switch must only supply the appliance and its corresponding controls i e time clock room thermostat etc Alternatively an un switched shuttered socket with a fused 3 pin plug both complying with BS 1363 is acceptable 3 8 MOUNTING ON A COMBUSTIBLE SURFACE If the appliance is to be fitted on a wall of combustible material a sheet of fireproof material must protect the wall 3 9 TIMBER FRAMED BUILDINGS If the appliance is to be fitted in a timber framed building it shouldbe fitted in accordance with the Institute of Gas Engineers publication IGE UP 7 Guide for Gas Installations in Timber Frame Buildings 3 10 INHIBITORS Vok ra recommend that an inhibitor suitable for use with aluminium heat exc
65. oltage free time clocks fig 39 programmable room thermostats fig 40 programmable RF room thermostats fig 39 low voltage 24Vdc room thermostat CN5 fig 39 8 3 OTHER DEVICES Contact the controls manufacturer and or Vok ra technical department should you require more specific information on the suitability of a particular control Further guidance on the recommended practice for the installation of external controls can be found in CHeSS HC5 HC6 www energyefficiency gov uk 8 4 VOKERA LOWER COVER MECHANICAL CLOCK fig 3 The Vok ra lower cover mechanical clock kit product code 20025081 is entirely suitable for the Compact range and elimi nates the need for an external time control The kit is comprised of the following e lower cover e mechanical clock e wiring harness e instructions Isolate the appliance from the electrical supply remove the boiler casing se 4 7 1 and locate the terminal block cover see 4 7 2 Connect the spade connections of the wiring harness to the terminal block identify the 2 black wiring black color or black cable indication and connect to the room thermostat terminal block CN5 see fig 39 identify the blue and brown wiring blue brown color or blue brown cable indication and connect to the M3 terminal block see fig 39 Refit the appliance terminal block and the boiler casing Fit the cover kit to the boiler IMPORTANT e The boiler must always be supp
66. ontinuity check will be required to trace 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 using a suitable multimeter carry out the following voltage tests e connect test leads between the Live amp Neutral connections at the appliance terminal strip The meter should read approximately 230V ac If so proceed to next stage If not see 7 7 4 e connect test leads between the Live amp Earth connections at the appliance terminal strip The meter should read approximately 230V ac If so proceed to next stage If not see 7 7 4 e connect test leads between the Neutral amp Earth connections at the appliance terminal strip The meter should read approximately 0 15Vac If so polarity is correct If not see 7 7 4 7 7 4 REVERSED POLARITY OR SUPPLY FAULT Repeat the above tests at the appliance isolator if testing reveals correct polarity and or supply at the isolator re check wiring and connections between the isolator and the appliance If tests on the isolator also reveal reversed polarity or a supply fault consult the local electricity supplier for advice 7 7 5 RESISTANCE TO EARTH CHECK Isolate the appliance from the electrical supply and using a suitable multi meter carry out a resistance test Connect test leads between the Live amp Earth connections at the appliance terminal strip If the meter reads other
67. opping up use the following instructions as a guide Locate the filling valve connections usually beneath the boiler see fig 2 Attach the filling loop to both connections Open the filling valve slowly until you hear water entering the system Close the filling valve when the pressure gauge on the boiler reads between 1 and 1 5 BAR see fig 1 Remove the filling loop from the connections 3 2 HOW TO RESET THE APPLIANCE When the red fault LED is illuminated the appliance will require to be reset manually Before resetting the boiler check what action is required to be taken using the information on the fault code table below Allow a period of two minutes to elapse before rotate the mode selector knob across the 0 position see fig 1 IMPORTANT If the appliance requires to be reset frequently it may be indicative of a fault please contact your installer or Vok ra Customer Services for further advice 2 3 LIGHTING THE BOILER Ensurethe gas and electrical supply to the boiler are turned on Turn the mode selector switch to the ON position When there is a request for heating or hot water via the time clock or programmer the boiler will begin an ignition sequence When the appliance reaches the CH set temperature the burner will go off for a minimum period of approximately 3 minutes When the programmer time clock or external thermostats heating request has been satisfied the appliance will switch off
68. pliance using the gas meter that serves the appliance If the installation does not include a gas meter for example LPG and there are no means by which to calculate the gas rate then a combustion analysis test must be carried out in accordance with BS 7967 UK to ensure the appliance is left working safely and correctly Additionally if the gas valve has been adjusted replaced or the appliance has been converted for use with another gas type then it becomes necessary to carry out a combustion analysis check to ensure that correct combustion is occurring If there are no means to gas rate the appliance and or carry out a combustion analysis check then it will not be possible to complete the commissioning procedure Details on how to carry out the combustion analysis can be found in section 7 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 BS 7593 I S 813 ROI Should a cleanser be used it must be suitable for Aluminium heat exchangers It shall be from a reputable manu facturer and shall be administered in strict accordance with the manufacturers instructions and the DWTA code of practice NOTE Chemicals used to cleanse the system and or inhibit corrosion must be pH neutr
69. ponent removal procedure as described in 6 4 Remove the AAV locking pin K from the deaerator assembly and remove the AAV assembly L Replace in the reverse order 6 8 WATER PRESSURE SWITCH fig 24 Carry out component removal procedure as described in 6 4 Locate and remove the locking pin M from the water pressure switch N Remove the wiring Carefully withdraw the switch Replace in the reverse order 6 9 FLOW THERMISTOR fig 4 pos 17 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front cover Unclip the flow thermistor from the flow outlet pipe Disconnect thermistor electrical plug Replace in the reverse order 6 10 RETURN THERMISTOR fig 4 pos 20 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front cover Unclip the return thermistor from the return inlet pipe Disconnect thermistor electrical plug Replace in the reverse order 6 11 PRINTED CIRCUIT BOARD fig 25 Carry out component removal procedure as described in 6 4 Pull the control fascia forward and lower it Push the clips O which secure the PCB cover remove cover after carefully taking note of all wiring connections and jumper tag configu ration Unhook and remove connection block P 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 2
70. pplies heated water to your radiators and hot water to your hot water taps The central heating is controlled via a time clock and any thermostats that your installer may have fitted The boiler will light when it receives a request from the time clock via any thermostat that may be installed or whenever a hot water outlet tap is opened Your Compact boiler lights electronically and does not have a pilot light In the unlikely event of a fault developing with your boiler the supply of gas to the burner will be terminated automatically 1 6 DIMENSIONS Compact25 29 HEIGHT 715mm WIDTH 405mm DEPTH 248 mm 1 7 CLEARANCES REQUIRED ABOVE 150mm BELOW 150mm LEFT SIDE 12mm RIGHT SIDE 12mm FRONT 600 mm 1 8 FROST PROTECTION SYSTEM The Compact is equipped with a built in frost protection system this enables the boiler to over ride the time controls even if switched off and operate the burner and or pump should the temperature drop below 5 C for the main and for the DHW line In particular the burner will be in ON status until the main temperature reaches 35 C for CH appliance and 55 C for DHW appliance Please note that the frost protection system is designed to protect the appliance only should frost protection be required for the heating system additional controls may be required NOTE The frost protection system is reliant on the appliance having a permanent electrical s
71. r additional bend s connect the required number of flue extensions or bends up to the maximum equivalent flue length between the boiler and vertical flue assembly see fig 14 Ensure that any horizontal sections of the flue system have a minimum 1 maximum 3 fall back to the boiler 1 17mm per 1000mm NOTE When cutting an extension to the required length you must ensure that the excess is cut from the plain end of the extension Remove any burrs and check that any seals are located properly You must ensure thatthe entire flue system is properly supported and connected 4 5 3 TWIN FLUE SYSTEM The Vok ra twin flue system enables greater flue distances to be achieved than that of a concentric flue system It can be used for horizontal or vertical applications however the twin flue system must be converted to the dedicated concentric flue kit for termination It is essential that the installation of the twin flue system be carried outin strict accordance with these instructions GUIDANCE NOTES ON TWIN FLUE INSTALLATION e The flue must have a have a minimum 1 maximum 3 1 17mm per 1000mm fall back to the appliance to allow any condensate that may form in the flue system to drain via the condensate drain Consideration must also be given to the factthatthere is the possibility of a small amount of condensate dripping from the terminal e Ensure that the entire flue system is adequately supported use at least one
72. rmistor wiring connections Locate and remove the 4 screws A2 Locate and remove the 2 screws A3 Gently ease the condensate collector A4 out off its location Gently ease the flue collector out off its location Replace in the reverse order 6 20 1 DHW FLOW RESTRICTOR fig 34 Carry out the component removal procedure as described in 6 4 Disconnect the cold water inlet pipe at the DHW flow switch B2 Using a small screwdriver gently ease the flow restrictor C2 from its seating Replace in the reverse order Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 20 2 DHW FLOW SWITCH fig 34 Carry out component removal procedure as described in 6 4 Remove the locking pin D2 Disconnect and remove the cold water inlet pipe from the DHW flow switch amp DHW heat exchanger Disconnect the wiring to the DHW flow switch Slacken and unscrew the inlet connection Unscrew the nut E2 Lift the DHW flow switch housing from its seating If necessary remove the locking pin F2 from the DHW flow switch taking care not to lose the float contained within the housing Replace in the reverse order ensuring that the housing is firmly inserted onto its seating Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 20 3 VALVE ACTUATOR fig 35 Carry out component removal procedure as described in 6 4 Remove the locking pin G2 that secures the actuator H2
73. s V for electrode Remove the spark ignition electrode W Remove the flame sensor electrod Y 6 14 FLUE FAN amp 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 valve G1 Locate and slacken the silencer H1 Locate and remove the sense electrode To remove the fan E1 disconnect the electrical connections attached to the fan locate and remove the four screws F1 Gently ease the fan from its location To remove the mixer C1 locate and remove the three screws D1 the mixer can be removed after the fan removal Replace in the reverse order Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 15 BURNER fig 28 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 valve G1 Locate and slacken the silencer H1 disconnect the electrical connections attached to the fan Disconnect the electrode leads and ancillary wiring from their respective connectors Locate and remove the screws 11 which secure the burner assembly in position to the heat exchanger J1 Gently ease
74. s please refer to section 8 for detailed instructions ANY EXTERNAL CONTROL OR WIRING MUST BE SERVED FROM THE SAME ISOLATOR AS THAT OF THE APPLIANCE The supply cable from the isolator to the appli ance must be 3 core flexible sized 0 75mm to BS 6500 or equivalent Wiring to the appliance must be rated for operation in contact with surfaces up to 90 C 4 7 1 CASING REMOVAL fig 17 To gain internal access to the appliance you must first remove the casing proceed as outlined below e locate and unscrew the 2 screws A that secure the outer casing to the appliance e lift the casing upward to disengage it from the top locating hooks and then remove 16 e store the casing and screws safely until required Re fit in the reverse order e gently lower the control fascia until it rests 4 7 2 APPLIANCE TERMINAL BLOCK The appliance terminal block is located on the rear of the control fascia Remove the casing as described in 4 7 1 Gently pull the control panel forwards and down Locate the terminal block cover fig 18 NOTE The appliance comes with a factory fitted link TA to allow basic operation of the boiler via the mode selector switch If it is anticipated that external controls will be required please refer to the wiring diagrams in section 8 for more detailed information 4 7 3 CONNECTING THE MAINS 230V INPUT Unhook and remove the terminal block cover 230V Pass the cable through the cable anchorage point Con
75. st re charging takes place Replace the dust cap and carry out the relevant commissioning procedure section 5 7 6 EXTERNAL FAULTS Before carrying out any faultfinding or component replacement ensure the faultis not attributable to any aspect of the installation 7 6 1 INSTALLATION FAULTS Possible cause Check wiring check electrical supply Check pipe work Symptom No led ignition No hot water No heating Check external controls Fault Possible cause Red led fixed Check gas supply check flue system check polarity 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 earth wire of the appliance supply cable The resistance should be less than 1 OHM If the resistance is greater than 1 OHM check all earth wires and connectors for continuity and integrity 7 7 2 SHORT CIRCUIT CHECK Isolate the appliance from the electrical supply and using a suitable multi meter carry out a short circuit test between the Live amp Neutral connections at the appliance terminal strip Repeat above test on the Live amp Earth connections at the appliance terminal strip NOTE Should it be found that the fuse has failed but no fault is indicated a detailed c
76. sumers statutory rights are not affected A Riello Group Company Company Reg No 1047779 Cod 20020792 04 10 Ed 0
77. t person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference Failure to install and commission this equipment to the manufacturer s instructions may invalidate the warranty but does not affect statutory rights Customer Name Telephone Number Address A EEE Se Pe Bolerse al Numb r _ tL tT tL ett tee eT LT TELE Td a SIS Commissioned by print name IO GAS SAFE ID Number Company Name Telephone Number Company Address Commissioning Date To be completed by the customer on receipt of a Building Regulations Compliance Certificate Buildi ions Notification Number CONTROLS Tick the appropriate boxes Time and Temperature Control to Heating Room Thermostat and Programmable Load Weather Optimum Start Time and Temperature Control to Hot Water Cylinder Thermostat and Programmer Timer _ Combination Bolter _ Heating Zone Valves Fitted Not Required _ Hot Water Zone Valves Fitted _ Not Required Thermostatic Radiator Valves Fitted _ Not Required _ Automatic Bypass to System Not Requires _ Boiler Interlock Provided _ ALL SYSTEMS The system has been flushed and cleaned in accordance with BS7593 and boiler manufacturer s instructions Yes What system cleaner was used What inhibitor was used Quantity litres CENTRAL HEATING MODE Measure and Record What type of scale reducer has be
78. t screw see fig 37 clockwise to increase counter clockwise to decrease until the correct value is displayed on the CO analyser allow time for the analyser to stabilise 7 3 3 GAS VALVE MINIMUM SETTING Set the CO button at minimum see 7 3 1 once the minimum is obtained check that it corresponds with the appropriate CO value Minimum for the respective appliance see 2 11 If the CO reading is correct proceed to completion 7 3 4 However if the CO reading is incorrect the minimum gas pressure must be adjusted as follows e locate the minimum adjustment screw fig 37 remove the protection plug using a TX 15 key Torx key e using a TX 15 key Torx key very slowly turn the minimum adjustment screw see fig 37 clockwise to increase counter clockwise to decrease until the correct value is displayed on the CO analyser allow time for the analyser to stabilise 7 3 4 COMPLETION On completion of the combustion analysis check and or any gas valve adjustment refit the plug fig 36 L2 and move the mode selector throught 0 position Remove the test probe from the test point and refit the sealing screw s and or cap IMPORTANT AGAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED REPLACED OR DISTURBED 7 4 COMBUSTION ANALYSIS TEST A combustion analysis check can easily be carried out on the appliance via the test points located on the top of the appliance see 7
79. th this appliance including these instructions and explain the importance of keeping them in a safe place Explain to the user how to isolate the appliance from the gas water and electricity supplies and the locations of all drain points Show the user how to operate the appliance and any associated controls correctly Show the user the location of the filling valve and how to top up the system pressure correctly and show the location of all manual air release points Explain to the user how to turn off the appliance for both long and short periods and advise on the necessary precautions to prevent frost damage Explain to the user that for continued safe and efficient operation the appliance must be serviced annually by a competent person IMPORTANT To validate the appliance warranty it s necessary to register the appliance details with us The warranty can be registered in several ways e by completing the warranty registration card and posting to us using the envelope supplied e online at vokera co uk e for UK residents by calling 0870 607 0281 e for ROI residents by calling 056 6655057 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 compo nent be replaced only with a genuin
80. than infinity there is a fault that must be isolated carry out a detailed continuity check to identify the location of the fault 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 8 FAULT FINDING Before attempting any faultfinding the electrical checks as detailed in 7 7 must be carried out Isolate the appliance from the electrical supply Disconnect any external controls from terminal plug CN5 fig 39 and insert a link wire between the two wires at the TA connections NOTE Restore the electrical supply to the boiler and turn the selector switch to the on position The boiler should now function as described in section 7 Should the boiler fail to respond the internal fuses and connectors should be checked to ensure integrity and continuity 7 9 COMPONENT VALUES 8 CHARACTERISTICS COMPONENT VALUE Fan 230Vac Pump 230Vac Valve actuator 230Vac Ignition transformer 230Vac Gas valve 230Vac Room thermostat connection 24Vdc NTC thermistor dry contact 10Kohm NTC thermistor wet contact 10Kohm FUNCTION VALUE Standard Heating temperature range min max C 40 80 DHW temperature range min max C 37 60 75 maximum CH time 1
81. the CO button see fig 36 pos SW1 Press the button the number of timing according the function requirement as par 7 3 1 swi 15 sp7 Fig 36 L__ Pm 7 3 1 CO FUNCTION SETTINGS Locate the CO button see 7 3 Select the main selector switch in position 10 CO FUNCTIONS ACTION ON THE BUTTON LED STATUS combustion analysis mode press once burner running at maximum heating yellow led blinking gas valve maximun setting press twice burner running at maximum DHW yellow led blinking red led fixed gas valve minimum setting press three time burner running at minimum yellow led blinking green led fixed NOTE 1 Any additional pressing of CO button after the third time the burner switched between maximum DHW and minimum 2 To restart the CO function it is necessary to pass throught the O position with the main selector switch 7 3 2 GAS VALVE MAXIMUM SETTING Set the CO button at maximum see 7 3 1 once the maximum is obtained check that it corresponds with the appropriate CO value Maximum for the respective appliance see 2 11 If the CO reading is correct proceed to gas valve minimum setting 7 3 3 However if the CO reading is incorrect the maximum gas pressure must be adjusted as follows e using a TX 15 key Torx key very slowly turn the maximum adjustmen
82. the appliance gas type 33 SA1 Related documents 19 05 Gas BEE ster 35 Ge ES de 10 6 Checking the CO and adjusting the gas valve 33 3A 4 Flue system 10 SRE Kir supply 4 Benchmark 35 36 3A 6 Water circulation 11 3A 7 Electrical supply 11 3A 8 Mounting on a combustible surface 11 3A 9 Timber framed buildings 11 3A 10 Inhibitors 11 3A 11 Showers 11 3A 12 Declaration of conformity 11 USERS INSTRUCTIONS INTRODUCTION Dear Customer Your Vok ra Compact 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 efficiency Please therefore take some time to read these instructions carefully Do s and Don t s Do ensure that the system pressure is periodically checked Do ensure that you know how to isolate the appliance in an emergency Do ensure that you are familiar with the appliance controls Do ensure that your installer has completed the appliance log book section Do not attempt to remove the appliance casing or gain internal access Do not hang clothes etc over the appliance Do not forget to have the appliance serviced annually 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 appliance is located installed A replacement copy can be obtained from Vok ra customer services 1
83. the boiler A flexible pipe condense outlet pipe is connected to the outlet of the trap The flexible pipe must be connected to a plastic waste pipe only The plastic waste pipe must have a minimum of a 3 fall towards the drain Any external run of pipe should be insulated to prevent the risk of freezing 4 6 7 CONNECTING THE CONDENSATE OUTLET Gently pull the condense outlet pipe down from its location inside the boiler until approximately 100mm protrudes from the underside of the boiler Connect a suitable plastic not copper pipe no less than 20mm diameter to the outlet pipe and ensure it discharges in accordance with building regulations or other rules in force 4 7 ELECTRICAL CONNECTIONS The boiler is supplied with a 2 metre fly lead This lead can be used for connection to the electrical supply Connect the fly lead to a fused plug or fused isolator in the following way e brown wire to LIVE supply e blue wire to NEUTRAL supply e green yellow to EARTH connection Insert the supplied 3 AMP fuse into the fused isolator or fused plug Should the fly lead be unsuitable refer to 4 7 3 for details on how to connect the electrical supply directly to the boiler The electrical supply must be as specified in section 3 3A A qualified electrician should connect the appliance to the electrical supply If controls external to the appliance are required acompetent person must undertake the design of any external electrical circuit
84. ts Signature SERVICE 7 Date Efficiency Checklist co Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 9 Date En Efficiency Checklist l Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 2 Date Efficiency Checklist eted Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE A Date En Efficiency Checklist completed Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 6 Date En Efficiency Checklist ed Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments SERVICE 8 Date En Efficiency Checklist leted Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature SERVICE 10 Date En Efficiency Checklist leted Yes No Engineer Name Company Name Telephone Number GAS SAFE ID Number Comments Signature Vokera heating for life Registered address Vok ra 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 Vok ra Ireland West Court Callan Co Kilkenny T 056 7755057 F 056 7755060 Vok ra Limited reserve the right to change specification without prior notice Con
85. ufficient system pressure the pump and fan will be prevented from operating and the low pressure fault code will be indicated 7 2 1 SELECTOR SWITCH IN THE OFF RESET POSITION When the selector switch is in the OFF RESET position the following functions are active Active functions e frost protection system e pump amp actuator anti block 7 2 2 ON BOARD FUNCTIONS e CO FUNCTION the CO function when activated will allow the appliance to run a t CH maximum DHW maximum or minimum output whilst a combustion analysis check or a mechanical gas valve calibration is being carried out Whilst the CO function is active all other functions are disabled minimum power operating period anti cycle set point etc Once enabled the CO function will remain active for a 15 minute period or until the function is manually deactivated e FROST PROTECTION this function is only active when there are no requests for heating or HW If the temperature drops below 5 C the boiler will operate on minimum power until the temperature of the thermistors reaches 35 C for CH and 55 C for DHW Thereafter the pump amp fan will over run for 30 seconds e ANTI CYCLE FUNCTION the anti cycle function ensures the burner remains switched off for at least 3 minutes after the set point hysterisis set point 5 deg for CH heat request e PUMP ANTI BLOCK FUNCTION when there has been no heating or HW request for 24 hours the anti block cycle is activated The pu
86. upply and being in a non fault condition 1 9 APPLIANCE STATUS INDICATORS Your boiler is equipped with 3 status LED indicators the Green LED indicates that the flame is present the Red LED indicates the appliance has detected a fault whilst the Yellow LED indicates that there is Servicing operation in progress Fig 1 YELLOW LED DHW TEMPERATURE GREEN LED RED LED SELECTOR HYDROMETRE SELECTOR SWITCH HEATING TEMPERATURE SELECTOR 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 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 selector switch Hot water only Select this position if you want the boiler to supply hot water only no heating Hot water temperature selector move the selector clockwise to increase the heating outlet temperature or counter clockwise to reduce the temperature range 37 C 60 C Heating amp hot water Select this position when you want the boiler to respond to a heating and hot water request from the time clock progra
87. used The installation must be tested for tightness in accordance with BS6891 If the gas supply serves more than one appliance it must be ensured that an adequate supply is maintained to each appliance when they are in use at the same time 3 4 FLUE SYSTEM The terminal should be located where the dispersal of combustion products is not impeded and with due regard for the damage and discoloration that may occur to building products located nearby The terminal must not be located in a place where it is likely to cause a nuisance see fig 7 In cold and or humid weather water vapour will condense on leaving the terminal the effect of such pluming must be considered If installed less than 2m above a pavement or platform to which pipes should have a gradient to ensure air is carried naturally to air release points and that water flows naturally to drain cocks Except where providing useful heat pipes should be insulated to avoid heat loss and in particular to avoid the possibility of freezing Particular attention should be paid to pipes passing through ventilated areas such as under floors loft space and void areas 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 draining of the app
88. y supply the appliance and its corresponding controls i e time clock room thermostat etc 3A 8 MOUNTING ON A COMBUSTIBLE SURFACE If the appliance is to be fitted on a wall of combustible material a sheet of fireproof material must protect the wall 3A 9 TIMBER FRAMED BUILDINGS If the appliance is to be fitted in a timber framed building it should be fitted in accordance with I S 813 and local Building Regulations The Institute of Gas Engineers publication IGE UP 7 Guide for Gas Installations in Timber Frame Buildings gives specific advice on this type of installation 3A 10 INHIBITORS Vok ra recommend that an inhibitor suitable for use with aluminium heat exchangers is used to protect the boiler and system from the effects of corrosion and or electrolytic action The inhibitor must be administered in strict accordance with the manufacturers instructions Water treatment of the complete heating system including the boiler should be carried out in accordance with I S 813 and the Domestic Water Treatment Association s DWTA code of practice 3A 11 SHOWERS If the appliance is intended for use with a shower the shower must be thermostatically controlled and be suitable for use with a combination boiler 3A 12 DECLARATION OF CONFORMITY A Declaration of Conformity as defined in I S 813 must be provided on completion of the installation A copy of the declaration must be given to the responsibl

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