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Unica i28 - i32

1. TOP FLUE REAR FLUE 4 5 FITTING THE FLUE The top flue outlet permits both horizontal and vertical flue ap plications 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 Areduction must also be made to the maximum length see table below when additional bends are used Reduction for additional bends Bend Reductionin maximum flue length foreach bend 45 bend 1 0 metre 60 100 1 0 metre 80 125 90 bend 1 0 metre 60 100 1 5 metre 80 125 Horizontal flue terminals and accessories Part No Description Length 29450120 Horizontal flue
2. 4 6 1 GAS fig 26 The appliance is supplied with a 15mm service valve connect a 15mm 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 26 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 tighten both nuts NOTE Depending on system requirements it may necessary to in crease the size of the flow amp return pipe work after the service valve connections 4 6 3 COLD WATER INLET fig 26 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 26 The appliance is supplied with a 15mm outlet connection con necta 15mm pipe to the outlet connection and tighten both nuts 4 6 5 SAFETY VALVE fig 26 Connect the safety valve connection pipe to the safety valve outlet and tighten The discharge pipe must havea 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
3. BS 5440 PARTS 1 amp 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 Unica i28 Unica i32 Inlet pressure 37 0 mbar 37 0 mbar Heating maximum gas rate kg hr 1 55 1 94 DHW maximum gas rate kg hr 2 17 2 48 Minimum gas rate kg hr 0 31 0 35 Injector size 3 4 mm flap side 3 4 mm flap side 3 25 mm free side 3 25 mm free side CO2 maximum output 96 10 0 10 0 CO2 minimum output 96 10 0 10 0 CO maximum output ppm 190 180 CO minimum output ppm 20 5 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 adjust CO2 values see 10 6 10 4 GAS SUPPLY The gas supply must be connected to the appliance by a com petent 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 met
4. However if the CO reading is incorrect the maximum gas pressure must be adjusted as follows e using a 2 5mm Allen key very slowly turn the maximum ad justment screw see fig 47 clockwise to decrease counter clockwise to increase 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 47 using a suit able screwdriver remove the protection plug e using a 4mm Allen key very slowly turn the minimum adjust ment screw see fig 47 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 44 Q2 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 DISTURBE
5. 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 LEE wiring regulations and in Scotland the electrical provisions of the Building Regulations with respect to the installation of the appliance in a room or internal space containing a bath or shower 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 sup ply 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 Itis recommended that copper tubing to BS 2871 Part 1 is 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
6. secure the flue bend to the appliance flue spigot NOTE Fit the internal white trim to the flue assembly prior to con necting the flue pipe to the bend You must ensure that the entire flue system is properly sup ported and connected Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing The exterior trim can now be fitted 14 Outer clamps Terminal or To extension d J timm L y LA H IE i N 1 3 degree 0 degree X 65mm Y EXTENDING THE FLUE Connect the bend supplied with the terminal kit to the top of the boiler using clamp supplied see fig 15 The additional bends amp extensions have push fit connections care should be taken to ensure that the correct seal is made when assembling the flue system Connect the required number of flue exten sions or bends up to the maximum equivalent flue length to the flue terminal see fig 15 17 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 exten
7. 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 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 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 electri cal 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 fused spur 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 mate rial th
8. Failure to install and commission the appliance in accordance with the manufacturers instructions will invalidate the warranty This does not affect your statutory rights 1 5 HOW DOES IT WORK Your Unica boiler supplies heated water to your radiators and hot water to your hot water taps The central heating is con trolled 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 Unica 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 Unica i28 i32 HEIGHT 780 mm WIDTH 400 mm DEPTH 358 mm 1 7 CLEARANCES REQUIRED ABOVE 150 mm BELOW 150 mm LEFT SIDE 12mm RIGHT SIDE 12 mm FRONT 600 mm 1 8 FROST PROTECTION SYSTEM The Unica 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
9. Heating ON hysterisis C SP 5 DHW OFF hysterisis C SP 5 isis C SP 4 Anti cycle delay 3 min Pump over run 30 sec Low output min output Min 25 LCO function max temp C 90 LCO re light temp C 78 CO function time 15 min Flow NTC max temp C 90 Flue NTC max temp C 125 IGNITION CONTROL VALUE Ignition attempts before L O lockout 5 Re ignition attempts after loss of flame signal 5 APPLIANCE STATUS AND FAULT CODES When the boiler detects a temporary fault condition the ap propriate code is shown If when the fault is final the pump will perform a 60 second post circulation and fault code will be displayed See table on page 28 27 28 ALARM CODE CAUSE ALARM TYPE ACTION St AUTOSTOP Final Call Landlord CL CALL FOR SERVICE Temporary then Call Landlord final Ignition failure flame not sensed Final Reset check appliance operation A01 x Q internal fault A02 A Limit thermostat fault Final Reset check appliance operation Fan tacho signal fault Final Reset check appliance operation A03 Q check fan D Insufficient system water pressure Final Check refill system pressure reset A04 Q check appliance operation A06 A DHW thermistor fault Temporary Check DHW thermistor Primary flow thermistor fault Temporary Check primary thermistor check wiring Primary flow thermistor over tempe Temporary then Reset che
10. amp 25 C this will allow the PCB to recalculate the system temperature required the default temperature for calculating the curve is 20 C The graph below can be used to determine the correct curve setting 20 aire o ES UI a P rd DI n E gt D H 2 bal ul a 20 15 10 5 H 5 0 8 D EXTERNAL TEMPERATURE C 30 of PARA eo JP AARRE JP6 N12 E Climatic Curves en le 30 25 i 3 oe Sdt P4 JP Hoe JP6 CN12 3 o ke 2 S o a E o e 2 El o z 9 u External Temperature C Maximum set point for standard T range JP7 removed Maximum set point for low temperature T range JP7 inserted 7 11 ALARM RECORDS The ALARM RECORDS function starts automatically once the display has been on for 2 hours or immediately by setting the P1 parameter to 1 The records include all the latest alarms up to a maximum of 5 alarms and they are displayed in sequence by pushing and releasing the P1 button on the display board If the records are empty PO 0 or if tracking the same is disabled P1 0 the display function is not available Alarms are displayed in reverse order compared to the order in which they occurred this means that the last alarm genera ted is the first to be displayed To delete the alarms records simply set parameter PO to 0 000 000 NOTE
11. is designed to protect the appliance only should frost protec tion 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 supply and being in a non fault condition 1 9 APPLIANCE STATUS INDICATORS Your boiler is equipped with a large LCD display that indicates the appliance operating status PRESSURE GAUGE DISPLAY LED MODE SELECTOR SWITCH HOT WATER HEATING TEMPERATURE SELECTOR FM eco HOT WATER TEMPERATURE SELECTOR Move the selector clockwise to increase the hot water outlet temperature or counter clockwise to reduce the temperature PRESSURE GAUGE Ensure the system pressure is set correctly minimum 0 5 bar MODE SELECTOR SWITCH HEATING TEMPERATURE SELECTOR Mode selector switch Hot water only Select this position if you want the boiler to supply hot Da water only no heating Hot water temperature selector move the selector clockwise to increase the DHW outlet temperature or counter clockwise to reduce the temperature range 37 C 60 C The display shows the temperature values DHW pre heat function Turning the domestic hot water temperature adjustment knob to the symbol activates the pre heating function Bring the domestic hot water temperature adjustment knob back to the required po sition The activation of this function is indicated on display with the P i
12. 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 haz ard 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 instruc tions 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 Checkthe operation of the appliance and ensure it functions as described in section 7 Compare the performance of the appliance with its design specification The cause of any noticeable deterioration should be identified and rectified without delay 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 Check and adjust if necessary the system design pres sure see 5 10 Carry outan analysis of the flue gases see 7 3 and visually check the condition of
13. sion Remove any burrs and check that all seals are located properly You must ensure that the entire flue system is properly supported and connected Seal the flue assembly to the wall us ing cement or a suitable alternative that will provide satisfactory weatherproofing The interior and exterior trim can now be fitted 4 5 1 2 FITTING THE REAR FLUE fi g 18 rear flue outlet only Using the template provided mark and drill a 125mm hole for the passage of the flue pipe see fig 12 The hole should be drilled LEVEL to ensure any condense fluid that forms is al lowed to drain back to the appliance 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 en sure that the bracket is mounted securely Once the bracket has been secured to the wall remove the blanking plate from the rear of the boiler Fig 20 NOTE The inner 60mm pipe of the rear flue terminal must be cut by 12mm at the point indicated fig 18 pos A Attach the rear flue terminal to the appliance using the pre viously retained screws and fix the telescopic terminal to the correct length wall thickness ensuring that the terminal will protrude through the wall by the correct distance At this point lift the appliance and carefully insert the terminal into and through the wall
14. 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 THESYSTEM 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 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 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 from Vok ra spar
15. Heating return connection Heating flow connection Gas connection Hot water outlet Cold water inlet 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 tem perature 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
16. TO RESET THE APPLIANCE When the fault code is displayed 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 on next page Allow a period of two minutes to elapse before rotating the mode selector knob across the position see fig 1 IMPORTANT If the appliance requires to be reset frequently it may be indica tive of a fault please contact your installer or Vok ra Customer Services for further advice 4 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 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 TEMPERA TURE 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
17. To get to the P1 button the cover on the control panel must be removed and the display board must be identified see figure PROGRAMMING PARAMETERS Functioning of the display can be personalised by program ming three parameters When button P1 on the display is held down for at least 10 sec the programming procedure is activated The three parameters with their respective values are shown in rotation on the display To edit a parameter value simply push the P1 button again when the required parameter is displayed and then hold it down until the value switches from 0 to 1 or vice versa ap prox 2 sec The programming procedure is closed automatically after 5 minutes or if there is an electrical power failure Parameter Default Description Deletion of alarms records BEES Ku oer O records empty 1 records not DI ER LE 8 A empty LU oo a i eg on T m i E pes L Immediate activation of alarm record management 0 delayed records management activated 1 immediate records management activated 31 SECTION 8 WIRING DIAGRAMS 8 1 8 1 1 EXTERNAL WIRING The appliance comes with a factory fitted TA link to allow basic operation of the boiler via the mode selector switch If external controls are to be added to the system they must be connected to the appliance as shown in the following diagrams For
18. advice on controls that are not featured in this book please contact Vokera technical on 0844 391 0999 EXTERNAL WIRING LIMITATIONS Any external wiring must remain within the limits as detailed in the table below NNECTION MAX LENGTH External sensor Room thermostat OT connection 30 metres 30 metres 30 metres 8 2 240V cables must be wired separately from 24V cables to avoid interference TYPICAL CONTROL APPLICATIONS The appliance can be used with the following controls OT control fig 49 please contact Vokera technical for detailed instruction on specific OT controls Male connector is factory fitted to be used with OT control female connector single channel voltage free time clocks or programmable room thermostat fig 48 If using the factory fitted male female connector the pink wires connected to the terminal strip M6 must be moved over to the room thermo stat socket position e Vokera external sensor fig 50 Room Thermostat 24 Vdc RES 2 V Fuse 3 15A F Room Thermostat 24 Vdc 8 3 OTHER DEVICES Contact the controls manufacturer and or Vokera technical department should you require more specific information on the suitability of a par ticular control Note if fitting other controls we would suggest removing the factory fitted male connector wires for ease of installation Further guidance on the recommended practice for the installation of extern
19. 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 or 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 17 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 exten sion Remove any burrs and check that any seals are located properly You must ensure that the entire flue system is properly sup ported 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 out in strict accordance with these instructions GUIDANCE NOTES ON TWIN FLUE INSTALLATION 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
20. 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 mark the position of the wall mounting bracket see fig 10 and flue hole if applicable 4 4 1 FITTING THE PRE FIXING JIG When the position of the appliance has been decided using the template supplied carefully mark the position of the wall mounting bracket pre fixing jig see fig 10 and flue hole if applicable Once the pre fixing jig is in place the pipework can now be fitted Fit the pipework to sit within the pre formed guides of the fixing jig and to the required length for ether a standard wall or standoff bracket see fig 10 Once the pipes have been fitted the jig can now be removed see fig 13 without rear spacer kit use position 2 with rear spacer kit use position 4
21. appliance output must be set according to the specific appliance specification Vok ra accepts no responsi bility if the gas type is not correctly adjusted according to the respective appliance specification as detailed on the appliance data badge 35 GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent 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 according to the manufacturer s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty This does not affect the customer s statutory rights Customer Name Telephone Number Address Boiler Make and Model Boiler Serial Number _ tT ETE Tt titi ttt ttt ttt tt ttt ttt Commissioned by print name Gas Safe Register Number Company Name Telephone Number Company Address Commissioning Date To be completed by the customer on receipt of a Building Regulations Compliance Certificate Building Regulations Notification Number if applicable CONTROLS Tick the appropriate boxes Time and Temperature Control to Heating Room Thermostat and Programmable Load Weather Optimum Start Programmer Timer Room Thermostat Compensation C Control Time and Temperature Cont
22. be carried out without switch on the boiler By turning the heating selection knob the monitor au tomatically shows the number of rotations expressed in hundreds e g 25 2 500 rpm GAS VALVE CALIBRATION Connect the boiler to the power supply Open the gas tap Set the function selector to 0 OFF RESET monitor off Remove the screws E remove the casing remove the re taining screw below the control fascia then lower the fascia towards you fig 24 Loosen the fixing screws on the cover F to access the terminal board Press the CO button N Live electrical parts 230 V AC Wait for burner ignition The display shows ACO The boiler operates at maximum heat output The combustion analysis function remains active for a limited time 15 min if a delivery temperature of 90 C is reached the burner is switched off It will be switched back on when this temperature drops below 78 C Insert the analyser probe in the ports provided in the air distribution box after removing the screws from the cover Press the combustion analysis button a second time to reach the number of rotations corresponding to the maxi mum domestic hot water output table 1 Check the CO2 value table 4 if the value does not match the value given in the table use the gas valve maximum adjustment screw Press the combustion analysis button a third time to reach the number of rotations corresponding t
23. ensuring that the holes in the appliance back frame are aligned with the studs on the wall bracket Seal the top flue outlet of the boiler with the blanking plate provided with the rear flue kit Fig 19 Using the screws and washers provided secure the appliance onto the wall bracket and tighten with a suitable spanner Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing The exterior wall trim can now be fitted Part No Description Length 29450133 Rear flue terminal 825mm 15 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 ap pliance 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
24. flue pipes onto the concentric to twin converter ensuring that the exhaust pipe connects to the exhaust con nection 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 sup ported and connected e Ensure that any horizontal sections of pipe have a fall of between 1 amp 3 towards the appliance 1 217mm per 1000mm b 1 deg 17mm S 1 0 metre 67e 00 Fig 24 I I Pp a DE Fig 25 ZS 17 4 6 CONNECTING THE GAS AND WATER The appliance is supplied with an accessory pack that includes service valves The service valves are of the compression type The accessory pack contains sealing washers etc for use with the service valves When connecting pipe work to the valves tighten the compression end first then insert the sealing wash ers before tightening the valve to the appliance NOTE It will be necessary to hold the valve with one spanner whilst tightening with another
25. flushing of the system 19 2 8 Lighting the boiler 4 5 5 Pre operation checks 19 2 4 Adjusting the heating temperature 4 5 6 Initial lighting 19 2 5 Adjusting the hot water temperature 4 5 7 Checking gas pressure amp combustion analysis 19 2 6 Explanation of features 4 5 8 Final flushing of the heating system 19 2 7 Automatic temperature control 4 5 9 Setting the boiler operating temperature 19 5 10 Setting the system design pressure 19 How to Page 5 11 Regulating the central heating system 19 3 1 How to top up the system pressure 4 5 12 Final checks 20 3 2 Howto reset the appliance 4 5 13 Instructing the user 20 3 3 How to shut down the system for short periods 4 3 4 How to shut down the system for long periods 4 Servicing Page 3 5 Howto care for the appliance 4 6 1 General 20 6 2 Routine annual servicing 20 What if Page 6 8 Replacement of components 20 4 1 What if suspect a gas leak 5 6 4 Component removal procedure 20 4 2 Whatiflhave frequently top up the system 5 6 5 Pump assembly 21 4 3 What if the appliance is due its annual service 5 6 6 Safety valve 21 4 4 What if need to call an engineer 5 6 7 Lower automatic air release valves 21 6 8 Water pressure switch 21 Installation and Servicing instructions 6 9 Flow thermistor 21 Design principles amp operating sequence Page 6 10 Return thermistor 21 1 1 Principle components 7 6 11 Printed circuit board 22 1 2 Mode of operation at rest 7 6 12 Gas valve 22 1 3 Mode of operati
26. from the vessel Unscrew the nut that secures the vessel to the lower frame Locate and remove the 6 screws U1 that secure the vessel top holding plate V1 remove the plate 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 42 Carry out component removal procedure as described in 6 4 Disconnect the 2 upper rubbers condense pipe W1 Remove the pin X1 that secures the trap to the air box plate Discon nect the lower rubber condense pipe from the condense trap Carefully remove the condense trap Remove the 2 screws Y1 and clean the condense trap Replace the component taking care the longer pipe on the cover is positioned on the right side Disconnect the the locking pin Z1 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 J1 Replace in the reverse order 6 20 FLUE COLLECTOR REMOVAL fig 43 Carry out component removal procedure as described in 6 16 Locate and remove the screw A2 that secures the flue gas analysis test point cover B2 Remove the clip and the fumes thermostat C2 Lo
27. 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 DIGITAL DISPLAY NW Displayed when heating mode is active Displayed when hot water mode is active D ak Displayed when frost protection function is ac tive nox A x je C Displayed when hot water pre heat function is i l enabled Flashes when functioning e Du n W o x Displayed if an alarm or fault has been detected Displayed when low system pressure has been detected y Displayed when an external sensor is connected l to the boiler Displayed if an ignition fault has been detected 2 GETTING STARTED 2 1 BEFORE SWITCHING ON Before switching the appliance on please familiarise yourself with howtoisolate the appliance from the gas water and electricity supplies how to check and top up if necessary the system water pressure the time clock or programmer if fitted any 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 appliance controls include pressure gauge appliance mode selector temperature selectors 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
28. maximum flue length for each bend 45 bend 1 0 metre 60 100 1 0 metre 80 125 90 bend 1 0 metre 60 100 1 5 metre 80 125 Vertical flue terminal and accessories Part No Description Length 29450122 Vertical flue terminal 1000 mm 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 500 mm 29450126 1000mm extension 1000 mm 29450127 2000mm extension 2000 mm 29450128 Telescopic extension 372 519 mm 529 Wall bracket pack 5 208mm Using the dimensions given in fig 21 as a reference mark and cut a 125mm hole in the ceiling and or roof Fit the appropriate flashing plate to the roof and insert the ver tical flue terminal through the flashing plate from the outside ensuring thatthe collar on the flue terminal fits overthe flashing 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 ap pliance onto the bracket 16 IMPORTANT The vertical flue terminal is 1 0 metre in length and cannot be cut therefore it may be necessary to adjust the height of the appliance to suit or use a suitable extension Connect the vertical flue assembly to the boiler flue spigot us ing the 100mm clip gasket
29. mm 60mm for 80 125 5 flue Above ground roof or balcony level 300 mm From a surface or boundary facing the terminal 600 mm From a terminal facing a terminal 1200 mm From an opening in the car port into the building 1200 mm Vertically from a terminal on the same wall 1500 mm Horizontally from a terminal on the same wall 300 mm From a structure to the side of the vertical terminal 300 mm From the top of the vertical terminal to the roof flashing As determined by the fixed collar of the vertical terminal To the side of a boundary 300 mm To the side of an opening or window on a pitched roof 600 mm Below an opening or window on a pitched roof 2000 mm From a vertical terminal to an adjacent opening window air brick etc call Vokera technical for advice From a vertical terminal to an adjacent vertical terminal 300 mm only if both terminals are the same hight 4072 OuZErzxc c rommoour SECTION 3 GENERAL REQUIREMENTS UK This appliance must be installed by a competent person in ac cordance 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 authority the Building Standards Scotland Regulation and Building Stand ards Northern Ireland Regulations
30. produces condense which is collected in a trap located in the lower part of 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 care should be taken to ensure that the pipe connection to the trap remains secure Connect a suitable plastic not copper pipe no less than 21mm diameter to the outlet pipe and ensure it discharges in accordance with local 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 Insertthe supplied 3 AMP fuse into the fused isolator orfused 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
31. 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 COFUNCTION the CO function when activated will allow the appliance to run at CH maximum DHW maximum or minimum output whilsta combustion analysis check ora 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 pump will be activated for a period of 30 sec onds e ACTUATORANTI BLOCK FUNCTION when there has been no heating or HW request for 24 hours the anti block cycle is activated The divertor v
32. system are capable of withstanding pressures up to at least 3 bar 12 3A 7 ELECTRICAL SUPPLY The appliance is supplied for operation on 230V 50Hz electri cal 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 fuse spur with a contact separation of at least 3 5 mm 3 high voltage category The switch must only supply the appliance and its corresponding controls i e time clock room thermostat etc 3A 8 MOUNTING ONACOMBUSTIBLE SURFACE If the appliance is to be fitted on a wall of combustible mate rial there is no requirement for a sheet of fireproof material to 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 th
33. 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 recommendations 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 POIN
34. the CO reading is incorrect the maximum gas pressure must be adjusted as follows e using a 2 5mm Allen key very slowly turn the maximum ad justment screw see fig 44 clockwise to decrease counter clockwise to increase until the correct value is displayed on the CO analyser allow time for the analyser to stabilise 10 6 3 GAS VALVE MINIMUM SETTING Set the CO button at minimum see 10 3 1 once the minimum is obtained check that it corresponds with the appropriate CO value Minimum for the respective appliance If the CO read ing 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 44 using a suit able screwdriver remove the protection plug e using a 4mm Allen key very slowly turn the minimum adjust ment screw see fig 44 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 l selector to the O 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 ATTENTION Gas type and
35. the entire flue assembly Compare the results with the appliance design specification Any deterioration in performance must be identified and recti fied without delay 20 Check that the main heat exchanger is clean and free from any debris or obstruction Check and clean if necessary the condense trap to ensure correct operation The flame side of the burner is made of state of the art material Being fragile be particularly careful when handling mounting or dismantling the burner and adjacent components e g electrodes insula tion panelling etc avoid direct contact with any cleaning appliance e g brushes aspirators blowers etc 1 This component does not need any maintenance please do not remove it from its housing except where the O ring may have to be replaced The manufacturer declines all responsibility in cases of damages due to failing to observe the above 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 w
36. to the electrical supply If controls external to the appliance are required a competent person must undertake the design of any external electrical circuits 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 appliance 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 18 Fig 26 Hot water outlet Gas cock Cold water inlet stopcock C H flow valve C H return valve 4 7 1 CASING REMOVAL fig 27 To gain internal access to the appliance you must first remove the casing proceed as outlined below locate and unscrew the 3 screws A that secure the outer casing to the appliance lift the casing upward to disengage it from the top locating hooks and then remove Store the casing and screws safely until required Refit in the reverse order 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 28 NOTE The appliance comes with a factory fitted link TA to allow basic operation of the boiler via the mode selector switch If itis anticipated that external controls will be required please
37. to the graphs below HTG curve Qnheating COs a curve Qnheating Fan rotations rpm CO emissions s a p p m Heat output kW Heat output kW Unica i32 The boiler is supplied with the adjustments shown in the table Depending on plant engineering requirements or regional flue gas emission limits it is however possible to modify this value referring to the graphs below COs a curve Qnheating HTG curve Qnheating Fan rotations rpm CO emissions s a p p m Heat output kW Heat output kW REFERENCE REFERENCE 7 10 1 CHECKING THE FAN SPEED TEMPERATURE 15 C FBR o M ERATURE 20 C Locate the CO button see Fig 43 Select the main selector switch to the ON position press the CO button once the display will then scroll through the fan speeds along with the relevant icon 7 10 2 THERMOREGULATION To set the temperature regulation curve locate potentiometer P3 By turning P3 the curve is shown on the LCD display The user can adjust the temperature of the heating system indirectly by changing the required room temperature from between 15 C
38. 1 discon nect the electrical connections attached to the fan locate and remove the four screws E1 Gently ease the fan from its loca tion Replace in the reverse order Ensure all seals are in good condition taking care to ensure they are replaced correctly 6 15 BURNER fig 38 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front and the RH side covers Slacken the gas pipe A1 at the air box connection and swing rotate of the fan assembly Locate and remove the 3 internal nuts F1 which secure the fan assembly in position to the heat exchanger G1 Disconnect the electrode leads and ancillary wiring from their respective connectors Remove the retaining screws fig 36 for sensing electrode and remove Gently ease the fan assembly out of its location Once the as sembly has been removed the burner H1 can be withdrawn from the heat engine Ensure the seal 11 is in good condition taking care to ensure it is replaced correctly Replace in the reverse order 22 A c20 B _ 42freeside 3 25free side B 410freeside_ 3 25 free side 6 16 MAIN HEAT EXCHANGER fig 39 Carry out component removal procedure as described in 6 4 Unclip and remove the three air chamber covers front LH RH sides Disconnect all the wiring connections Fig 36 Slacken the gas pipe L1 at the air box connection and swing rotate of the fan assembl
39. 46 BS6798 Yes ALL INSTALLATIONS If required by the manufacturer record the following CO 1 96 OR CO ppm OR CO CO Ratio Ld The heating and hot water system complies with the appropriate Building Regulations Yes The boiler and associated products have been installed and commissioned in accordance with the manufacturer s instructions Yes The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes The manufacturer s literature including Benchmark Checklist and Service Record has been explained and left with the customer Yes Commissioning Engineer s Signature Customer s Signature To confirm satisfactory demonstration and receipt of manufacturer s literature AII installations in England and Wales must be notified to Local Authority Building Control _LABC either directly or through a Competent Persons Scheme A Building Regulations Compliance Certificate will then be issued to the customer e chmar COLLECTIVE MARK THE MARK OF QUALITY FOR THE INSTALLATION COMMISSIONING AND SERVICING OF DOMESTIC HEATING AND HOT WATER SYSTEMS Heating and Hotwater Industry Council HHIC www centralheating co uk Service Record It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed Service Provider Before completing the appropriate Service Record below please e
40. D 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 appli ance see 7 3 e Insert the flue gas analyser probe into the flue gas test point see fig 42 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 NoteAn existing boiler with a measured CO CO ratio of 0 004 1 or less can be deemed as operating satisfactorily with a mea sured 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 cor rect charge pressure should be 1 0 bar 0 1 bar If the charge pressure is less use a suitable pump to increase the charge 26 Maximum screw Compensation pipe connection Inlet gas pressure connection Minimum screw NOTE You must ensure the drain valve is in the open position whilst re charging takes place Replace the dust cap an
41. ERMISTOR fig 45 Carry out component removal procedure as described in 6 4 Locate and remove the thermistor locking pin N2 Gently ease the thermistor assembly O2 from the hydraulic manifold Replace in the reverse order 6 20 5 DIVERTOR VALVE ASSEMBLY fig 46 Carry out component removal procedure as described in 6 4 Remove the valve actuator as described in 6 20 Locate and remove the locking pin P2 that secures the valve housing cover to the hydraulic manifold Gently prise the valve assem bly from the manifold Replace in the reverse order ensuring that the seating assembly is inserted properly Ensure all seals are in good condition taking care to ensure they are replaced correctly 24 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 tight ness 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 in sufficient 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
42. IGHTNESS CHECK MUST BE CAR RIED OUT 6 12 1 INJECTOR Carry out component removal procedure as described in 6 4 Remove the mixer as described in 6 14 unscrew the screws fixing the plastic Venturi to the alumi nium shell Loosen the plastic Venturi B1 by levering from under the teeth be careful not to force them and press from the op posite side until it is completely extracted from the alumi nium shell Using a CH6 wrench remove and dont use again the 2 noz zles see details in figure Clean plastic traces Press in the 2 new nozzles from the kit as far as the threa ded part then screw in tightly Reassemble the mixer with the flap in an horizontal position Replace in the reverse order Check the number of fan speed 6 13 ELECTRODES amp CONDENSE SENSOR fig 36 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front and RH side covers Disconnect the electrode leads and ancillary wiring from their respective connectors Remove the retaining screws W for electrode and remove 6 14 FLUE FAN amp MIXER fig 38 39 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front and the RH side cov ers Slacken the gas pipe A1 at the air box connection and swing rotate away from the fan assembly Locate and remove the sense electrode To remove the mixer B1 locate and remove the three screws C1 To remove the fan D
43. If the appliance fails to ignite during the ignition sequence it will enter a lockout condition Should this occur please allow a period of atleast two minutes before re setting the appliance 2 6 EXPLANATION OF FEATURES Although the Vok ra Unica 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 the blank bullet points to automatically adjust raise the heating The activation and the disable of the function is visualized on the display if the heating temperature is selected between 55 65 C 3 3 HOW TO SHUT DOWN THE SYSTEM FOR SHORT PERIODS The system and boiler can be shut down for short periods by simply turning the time clock to the off position It is also advis able 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 scour ers or abrasive c
44. No Gas Safe Register No Gas Safe Register No Comments Comments Signature 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 Consumers statutory rights are not affected A Riello Group Company Company Reg No 1047779 Cod 20038660 07 13 Ed 3 39
45. STALLATION OF TWIN ADAPTOR KIT fig 22 amp 23 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 exhaustmanifold connection to the flue spigotusing the screw provided C e Using the two holes in the air inlet plate as a guide drill a 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 HORIZONTAL TERMINATION fig 24 The twin flue system must be converted to the dedicated con centric 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 alevel 130mm hole forthe passage ofthe horizontal fl
46. TS 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 accom modate the increased volume of water when the system is heated It can accept up to 8 litres of expansion from within the system generally this is sufficient however if the system has an unusually 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 should be 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
47. Vokera heating for life Unica 128 i32 High efficiency combi boiler voan Users Instructions Installation amp Servicing Instructions CE T T E 364 14 Unica i32 4736415 THESE INSTRUCTIONS TO BE RETAINED BY USER Oe orasi mnow scheme erbei dasi IR CET systems In the UK Users instructions Things you should know Page Installation Page 1 1 Gas appliances 1 4 1 Delivery 13 1 2 Electrical supply 1 4 2 Contents 13 1 3 Guarantee registration card 1 4 8 Unpacking 13 1 4 Appliance Log Book UK only 1 4 4 Preparation for mounting the appliance 13 1 5 How does it work 1 4 5 Fitting the flue 14 1 6 Dimensions 1 4 6 Connecting the gas amp water 18 1 7 Clearances required 1 4 7 Electrical connections 18 1 8 Frost protection system 1 1 9 Appliance status indicators 1 Commissioning Page 5 1 Gas supply installation 19 Getting started Page 5 2 The heating system 19 2 1 Before switching ON 4 5 3 Initial filling of the system 19 2 2 Appliance controls 4 5 4 Initial
48. al controls can be found in CHeSS HC5 HC6 www energyefficiency gov uk IMPORTANT The boiler must always be supplied with a permanent 230V electrical supply Always remove the link between TA amp TA on the appliance high voltage terminal strip whenever additional controls are connected to the appli ance Do not connect any controls or auxiliary equip ment to the low voltage terminal strip other than that approved supplied by Vokera Ltd Fuse 3 15A F OPTIONAL DEVICE 24V TERMINAL BLOCK ROOM THERMOSTAT EXTERNAL _ 24 Vdc SENSOR EXTERNAL External alarm E S external sensor OT opentherm connection FUNCTIONAL DIAGRAM SH aniq Wd JU E JOJDSUUOD OLN Josef uunjes OLN Jose MOJA Josues ont e sow y e y JOAO MO JOjOUJ Aem Jeuuojsueu uoniub opo2eje xJeds U93IMS eunssaJd Jop eunjeJeduue Joje JOY onseuloq L 6ND KEE HHHHHH ss a L d el 0 0 D H WNIGAW SIA U g no aniq o anoj anig U91IMS MO 18 em JOY 9 sewoq 05000 Jeufiis uey A 0 z Ajddns samod uey SpiOU9JOS BABA Sec dung OPA pZ JEJSOWUSY woo JO dus jeuruue Jamod uBiu uonoeuuoo e21329Je JO dus Jeuiuue d VGL oam jeulejx l VSL sng Josues duel uoyng uonoun ZOD S10j29uU02 1no 20j Jejoq pe e Dei NO uornounj ZOD wolleA z
49. alve 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 pointis withinthe SARA range to automatically adjust raise the heating flow outlet temperature should the room thermostat contacts remain closed for more that 20 minutes e DHW PRE HEAT FUNCTION when the DHW pre heatfunc tion is enabled the appliance will light periodically to maintain the temperature of the DHW heat exchanger When the DHW thermistor and the primary thermistor fall below 35 C and 55 C respectively the boiler will fire on minimum 25 power until the primary thermistor exceeds 55 C Thereafter the pump will over run for a period of 30 seconds 7 2 3 HEATING MODE With the 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 com mences 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 th
50. an may continue to operate to dissipate any residual heat within the appliance 1 5 SAFETY DEVICES When the appliance is in use safe operation is ensured by e awater 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 Flow temperature sensor Return temperature sensor Main heat exchanger vessel DHW tem perature sensor DHW heat exchanger Pressure switch Diverter valve x Automatic by pass f DHW hon return saey tT 7j Gale valve CH DHW return outlet inlet SECTION 2 TECHNICAL DATA 2 1 Central Heating Unica 28i Unica 32i Heat input kW 20 00 25 00 Maximum heat output kW 60 80 C 19 62 24 58 G20 G31 G20 G31 Minimum heat output kW 60 80 C 2 76 3 95 3 16 4 45 Maximum h
51. at the booklet is handed to the person re sponsible for the property in which the appliance is located installed A replacement copy can be obtained from Vok ra customer services 1 THINGS YOU SHOULD KNOW 1 1 GAS APPLIANCES Gas Safety Installation and Use Regulation UK In the interests of your safety and that of others it is a legal requirement that all gas appliances are installed and correctly maintained by a competent person and in accordance with the latest regulations 1 2 ELECTRICAL SUPPLY Please ensure that this appliance has been properly connected 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 COMMISSIONING CHECKLIST UK only A checklist section can be found at the rear of the appliance installation booklet This important document must be com pleted 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 re corded in the Benchmark commissioning checklist section within the installation booklet You can check your installers details by calling GAS SAFE direct on 08004085500
52. be given to the fact that there is the possibility of a small amount of conden sate dripping from the terminal Ensure that the entire flue system is adequately supported use at least one bracket for each extension As the exhaust outlet pipe can reach very high temperatu res it must be protected to prevent persons touching the hot surface The condensate drain pipe must be connected in accordan ce with building regulations Reduction for bends Bend Reduction i A flue I hf h Band 45 bend 1 0 metre 90 bend 1 5 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 Once the bracket has been secured to the wall mount the ap pliance onto the bracket IN
53. cate and remove the screws D2 that se cure the flue collector to the combustion chamber Gently pull forward and ease the flue collector from its location Replace in the reverse order 6 20 1 DHW FLOW RESTRICTOR fig 44 Carry out the component removal procedure as described in 6 4 Disconnect the cold water inlet pipe at the DHW flow switch E2 Using a small screwdriver gently ease the flow restrictor F2 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 METER fig 44 Carry out component removal procedure as described in 6 4 Remove the locking pin G2 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 E2 Unscrew the nut H2 Lift the DHW flow switch housing from its seating If necessary remove the locking pin 12 from the DHW flow switch 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 45 Carry out component removal procedure as described in 6 4 Remove the locking pin L2 that secures the actuator M2 to the heating manifold Disconnect the electrical plug from the actuator Replace in the reverse order 6 20 4 DHW TH
54. ck appliance operation A07 Q rature Final Temperature differential Final Reset check appliance operation check thermistors Return thermistor fault Temporary Check return thermistor check wiring Return thermistor over temperature Temporary then Reset check appliance operation Temperature differential inverted Final Reset check pump ensure there is sufficient circulation around heating circuit s Flue thermistor or flue thermistor Temporary Check flue thermistor counter at power A09 A counter fault on check flue thermistor check wiring Flue thermistor over temperature Final Reset check appliance operation A11 A False flame Temporary Check appliance power connection A77 O Low temperature thermostat fault Temporary Check low temperature thermostat j Calibration Na None Adj Service operation Na None ACOA P o Purge cycle mode active Na None P Preheating function active Na None P biinking Preheating function running Na None 6 Flame ON Na None Hours Stand by Na None OFF Na None 7 10 ADJUSTMENTS The boiler has already been adjusted by the manufacturer during production If the adjustments need to be made again for example after extraordinary maintenance replacement of the gas valve or conversion from methane gas to LPG ob serve the following procedures The adjustment of the maximum and minimum output and of the maximum and minimum heating and of slow switch on must be made strictly in the sequence indicated an
55. con ON This function keeps the water in the domestic hot water exchanger hot to reduce standby times when a request is made The display shows the delivery temperature of the heating water or the domestic hot water accor ding to the current request To deactivate the pre heat function rotate the domestic hot water temperature adjustment knob back to the symbol Bring the domestic hot water temperature adjustment knob back to the required position This function cannot be activated when the boiler is OFF function selector to OFF position oA Heating amp hot water Select this position when you want the boiler to re II spond to a heating and hot water request from the time clock programmer 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 the blank bullet points The display shows the temperature values 9 Boiler at OFF standby Select this position when you want the boiler to be switched off for short periods days or if the boiler requires to be reset The display shows Pressure gauge shows the current pressure of your heating system the gauge should be set between 1 and 1 5 BAR When the appliance is oper ating the gauge may rise or fall slightly this is quite normal The minimum permissible
56. d 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 Symptom Possible cause No ignition Check wiring check electrical supply No hot water Check pipe work No heating Check external controls Fault Possible cause Fault code Check gas supply check flue system check polarity 7 7 ELECTRICAL CHECKS Any electrical checks must be carried out by a suitably quali fied 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 ap pliance terminal strip NOTE Should it be found that the fuse has failed but no fault is in dicated a detailed continuity check will be required to trace the fault A
57. d only by qualified personnel only disconnect the boiler from the power supply turn the heating water temperature selector to its maximum loosen the fixing screws E on the instrument panel lift then turn the instrument panel towards you loosen the fixing screws on the cover F to access the ter minal board insert the jumpers JP1 and JP3 power up the boiler The display shows ADJ for approximately 4 seconds Next change the following parameters 1 Domestic hot water absolute maximum 2 Minimum 3 Heating maximum 4 Soft light fan speed as follows turn the heating water temperature selector to set the re quired value press the CO button and then skip to the calibration of the next parameter AN Live electrical parts 230 V AC The following icons light up on the monitor 1 T during domestic hot water absolute maximum cali bration 2 PA during minimum calibration 3 qM during heating maximum calibration 4 p during soft light fan speed calibration End the procedure by removing jumpers JP1 and JP3 to store these set values in the memory THE function can be ended at any time without storing the set values in the memory and retaining the original values as follows remove jumpers JP1 and JP3 before all 4 parameters have been set set the function selector to f OFF RESET cut the power supply waiting for 15 minutes after it is connected AN A Calibration can
58. e 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 responsible person and also to the gas supplier if required 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 anaccessories 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
59. e parts The spare flow rate restrictors can be fitted to either increase or decrease the maximum flow rate 19 5 11 2 FLOW RATE RESTRICTOR The boiler is supplied with the following flow restrictor Unica i28 9 litres 10 litres 11 litres Orange Blue Beige Spare Fitted Spare Unica i32 11 litres 12 litres 13 litres Beige Red Olive Spare Fitted Spare 5 12 FINAL CHECKS ENSURE ALL TEST NIPPLES ON THE APPLIANCE GAS VALVE ARE TIGHT AND CHECKED FOR TIGHTNESS ENSURE THE APPLIANCE FLUE SYSTEM IS FITTED CORRECTLY AND IS PROPERLY SECURED ENSURE ALL PIPE WORK IS RE CHECKED FOR TIGHT NESS RE FIT APPLIANCE CASING COMPLETE BENCHMARK CHECKLIST FOR UK ONLY Complete details of the boiler controls installation and com missioning 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 will invalidate the warranty 5 13 INSTRUCTING THE USER Hand over all documentation supplied with 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 use
60. e water sensed by the flow temperature sensor consequently a high temperature at the flow sensor results in a lower fan speed As the water tem perature increases the temperature sensors located on the flow 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 Ifthe spark sensing electrode does not sense ignition the appli ance will re attempt ignition a further 4 times then go to lockout When the set pointhas been reached the position of the heating temperature selector as measured atthe 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 p
61. eat output kW 30 50 C 21 44 26 70 Minimum heat output kW 30 50 C 3 00 4 20 3 44 4 74 Minimum working pressure 0 25 0 45 bar Maximum working pressure 2 5 bar Minimum flow rate 300 l h 2 2 Domestic Hot Water Unica 28i Unica 32i Heat input kW 28 00 32 00 Flow Rate AT35 C 11 5 13 1 Maximum inlet pressure 6 bar Minimum inlet pressure 0 2 bar Minimum flow rate 2 l min 2 3 Gas Pressures Unica 28i Unica 32i Inlet pressure G20 20 0 mbar 20 0 mbar Heating maximum gas rate m3 hr 2 12 2 64 DHW maximum gas rate m3 hr 2 96 3 38 Minimum gas rate m3 hr 0 30 0 34 Injector size mm 4 70 flap side 4 20 free side 4 25 flap side 4 10 free side 2 4 Expansion Vessel Unica 28i Unica 32i Capacity 8 litres Maximum system volume 76 litres Pre charge pressure 1 bar 2 5 Dimensions Unica 28i Unica 32i Height mm 780 Width mm 400 Depth mm 358 Dry weight kg 40 42 2 6 Clearances Unica 28i Unica 32i Sides 12mm Top 150mm from casing or 25mm above flue elbow whichever is applicable Bottom 150mm Front 600mm 2 7 Connections Unica 28i Unica 32i Flow amp return 22mm Gas 15mm DHW hot amp cold 15mm Safety valve 15mm Condense 21mm 2 8 Electrical Unica 28i Unica 32i Power consumption Watts 120 126 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 60 100 Unica 28i Unica 32i Maximum horizontal flue length 60 100
62. ed for use with another gas type then it becomes necessary to carry out a combustion analysis check to ensure that correct combustion is occurring Ifthere are no means to 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 8FINALFLUSHING OF THEHEATING SYSTEM The system shall be flushed in accordance with BS 7593 l 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 neutral 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
63. er 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 9 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 ANA LYSER 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 fig 40 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 fig 43 locate and press the CO button see fig 43 pos SW1 The appliance will now operate in CO mode for approximately 15 minutes CO FUNCTIONS ACTION ON THE BUTTON DISPLAY combustion analysis mode press once burner running at maximum heating ACO Wi A gas valve maximun setting press twice burner running at maximum DHW ACO T A gas valve minimum setting press three time burner running at minimum ACO WI T A 34 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 read ing is correct proceed to gas valve minimum setting 10 7 2 However if
64. ere is no requirement for a sheet of fireproof material to protect the wall 3 9 TIMBER FRAMED BUILDINGS If the appliance is to be fitted in a timber framed building it should be 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 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 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 t control emporary valve connection d E flow return double pipe check valve supply Fig 8 nips Make up vessel or tank Automatic air vent E gt lt Non return Stopcock valve E 2 E E E o g o E o 1 Heating return SECTION 3A GENERAL REQUIREMENTS EIRE This appliance must be installed by a competent person in accordance with and defined by the S
65. heat loss and in particular to avoid the possibility of 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 When an appliance is installed in a room or internal space containing a bath or shower the appliance or any control per taining 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 com bustion purposes and an adequate space for servicing and air circulation around the appliance Where the installation of the appliance will be in an unusuallocation special procedures may be necessary BS 6798 gives detailed guidance on this aspect Acompartmentused to enclose the appliance must be designed and constructed specifically for this purpose An existing com partment 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 no
66. hen 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 Undertake a complete com missioning check as detailed in section 5 after replacing any component ALWAYS TEST FOR GAS TIGHTNESS IF ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED OR DISTURBED 6 4 1 AIR BOX FRONT COVER REMOVAL fig 29 Locate the 4 screws and remove air box front cover 6 5 PUMP ASSEMBLY fig 30 Carry out component removal procedure as described in 6 4 Disconnect the flow pipe B from the combustion chamber connection slacken the pipe C at the hydraulic assembly and swing rotate clear of the pump assembly Remove the expansion pipe locking pin D from the top of the pump assembly and withdraw the flexible pipe Locate and remove the pressure gauge securing pin Dx and disconnect the pressure gauge from the pump assembly Disconnect the electrical wiring from the pump s electrical connection point E Locate and remove the 2 securing screws A 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 31 Carr
67. ided 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 Instal lation pipes must be fitted in accordance with I S 813 Pipe work from the meter to the appliance must be of adequate size Pipes of a smaller size than the appliance gas inlet con nection 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 appli ance 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 l 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 11 the terminal must be protected by a guard of durable material The guard must be fitted centrally over the terminal Refer to I S 813 when the
68. kit 900 mm 29450121 Telescopic flue kit 455 630 mm 522 Plume management kit 1370 mm 29450123 90 degree bend N A 29450124 45 degree bends pair N A 29450125 500mm extension 500 mm 29450126 1000mm extension 1000 mm 29450127 2000m extension 2000 mm 29450128 Telescopic extension 372 519 mm 529 Wall bracket pack 5 208mm Using the template provided mark and drill a 125mm hole for the passage ofthe 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 14 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 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 16 Measure dimension Y from the terminal end of the con centric flue pipe and cut off the excess ensuring any burrs are removed Pass the concentric flue pipe through the 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
69. mm 7 80m 7 80m Maximum vertical flue length 60 100mm 8 80m 8 80m 2 9A Flue Details concentric 80 125 Unica 28i Unica 32i Maximum horizontal flue length 80 125mm 20m 20m Maximum vertical flue length 80 125mm 25m 25m 2 9B Flue Details twin pipes Unica 28i Unica 32i Maximum horizontal flue length 80mm 80mm 50m 50m 45m 45m Maximum vertical flue length 80mm 80mm 50m 50m 45m 45m 2 10 Efficiency Unica 28i Unica 32i SEDBUK 96 2005 90 30 90 39 2 11 Emissions Unica 28i Unica 32i CO2 maximum output 96 9 0 9 0 CO2 minimum output 96 9 0 9 0 CO maximum output ppm 150 150 CO minimum output ppm 10 5 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 using this graph apply only the pressure loss of the system Residual head x 100 mbar 600 700 800 900 1000 1100 1200 1300 1400 1500 Flow rate I h Location Minimum distance Below an opening window air brick etc 300 mm Above an opening window air brick etc 300 mm To the side of an opening window air brick etc 300 mm Below gutter drain pipe etc 25 mm Below eaves 25 mm Below balcony car port roof etc 25 mm To the side of a soil drain pipe etc 25 mm 60mm for 80 125 5 flue From internal external corner 25
70. must be carried out ensure all gas service valves from the meter to the applian ce are open and the supply pipe has been properly purged ensure the proper electrical checks have been carried out see 7 8 particularly continuity polarity and resistance to earth ensure the 3 AMP fuse supplied with the appliance has been fitted ensure the system has been filled vented and the pressure set to 1 BAR ensure the flue system has been fitted properly and in ac cordance with the instructions 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 amp fault finding 5 7 CHECKING GAS PRESSURE AND COMBUS TION ANALYSIS The appliance is factory set so should require 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 appliance using the gas meter that serves the appliance and carry out a combustion analysis check in accordance with BS 7967 UK to ensure that correct combustion is occurring Additionally ifthe gas valve has been adjusted replaced or the appliance has been convert
71. nsure you have carried out the service as described in the manufacturer s instructions Always use the manufacturer s specified spare part when replacing controls Service 1 Date Engineer Name Service 2 Date Engineer Name Company Name Company Name Telephone No Telephone No Gas Safe Register No Gas Safe Register No Comments Comments Signature Signature Service 3 Date Engineer Name Service 4 Date Engineer Name Company Name Company Name Telephone No Telephone No Gas Safe Register No Gas Safe Register No Comments Comments Signature Signature Service 5 Date Engineer Name Service 6 Date Engineer Name Company Name Company Name Telephone No Telephone No Gas Safe Register No Operative ID No Comments Comments Signature Signature Service 7 Date Engineer Name Service 8 Date Engineer Name Company Name Company Name Telephone No Telephone No Gas Safe Register No Gas Safe Register No Comments Comments Signature Signature Service 9 Date Engineer Name Service 10 Date Engineer Name Company Name Company Name Telephone No Telephone
72. o the minimum out put table 2 Check the CO2 value table 5 if the value does not match the value given in the table use the gas valve minimum adjustment screw To exit the combustion analysis function turn the control knob Remove the flue gas probe and refit the plug Close the instrument panel and refit the housing The combustion analysis function is automatically deactivat ed if the board triggers an alarm In the event of a fault during the combustion analysis cycle carry out the reset procedure table 1 MAXIMUM NUMBER OF METHANE LIQUID GAS FAN ROTATIONS GAS G20 G31 Unica i28 heating DHW 45 61 45 61 rpm Unica i32 heating DHW 49 60 48 59 rpm table 2 MINIMUM NUMBER OF METHANE LIQUID GAS FAN ROTATIONS GAS G20 G31 Unica i28 12 15 rpm Unica i32 12 15 rpm table 3 SOFT LIGHT FAN METHANE LIQUID GAS SPEED GAS G20 G31 Unica i28 33 33 rpm Unica i32 37 37 rpm table 4 METHANE LIQUID GAS Max CO GAS G20 G31 Unica i28 9 0 10 0 Unica i32 9 0 10 0 table 5 A METHANE LIQUID GAS Min 60 GAS G20 G31 Unica i28 9 0 10 0 Unica i32 9 0 10 0 29 Unica i28 The boiler is supplied with the adjustments shown in the table Depending on plant engineering requirements or regional flue gas emission limits it is however possible to modify this value referring
73. oint 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 Aflow rate 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 satis fied 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 responsi bility 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 THEGAS VALVE MUST BESET UP ORADJUSTED WITH THE AID OF APROPERLY CALIBRATED FLUE GAS ANALYSER Isolate the appliance from the electrical supply and remove the appliance casing as described in 4 7 1 Setthe flue gas analyser to read CO and insert the probe into the flue analysis test point fig 42 Resto
74. on heating 7 6 13 Electrodes amp condense sensor 22 14 Mode of operation Hot water 7 6 14 Flue fan amp mixer 22 1 5 Safety devices 7 6 15 Burner 22 6 16 Main heat exchanger 23 Technical data Page 6 17 Automatic by pass amp DHW non return valve 23 2 1 Central heating 8 6 18 Expansion vessel 23 22 Domestic hot water 8 6 19 Condense trap removal 23 2 3 Gas pressures 8 6 20 Flue collector removal 24 2 4 Expansion vessel 8 2 5 Dimensions 8 Checks adjustments and fault finding Page 2 6 Clearances 8 7 1 Checking appliance operation 25 2 7 X Connections 8 7 2 Appliance modes of operation 25 2 8 Electrical 8 i justi valve 25 2 9 Flue details concentric 60 100 8 7 4 Combustion analysis test 26 2 9A Flue details concentric 80 125 8 i ion vessel 26 2 9B Flue details twin pipes 8 7 6 External faults 26 2 10 Efficiency 9 1 1 Electrical checks 26 2 11 Emissions 9 7 8 Fault finding 27 2 12 Pump duty 9 27 7 10 Adjustments 29 General requirements UK Page 7 11 Historical alarms 31 3 1 Related documents 10 3 2 Location of appliance 10 Wiring diagrams Page 3 3 Gas supply 10 8 1 External wiring 32 3 4 Flue system 10 8 2 Typical control application 32 3 5 Air supply 10 8 3 Other devices 32 3 6 Water circulation 10 3 7 Electrical supply 11 L P G instructions Page 3 8 Mounting on a combustible surface 11 9 1 Related documents 34 3 9 Timber framed buildings 11 9 2 Technical data 34 3 10 Inhibitors 11 9 3 Converting the appliance gas t
75. ontrol cleaners 8 Fig 3 control temporary valve connection y f ME flow return pipe double Ap check valve supply pipe FAULT CODES ALARM CODE CAUSE ACTION _St AUTOSTOP Call Landlord CL CALL FOR SERVICE Call Landlord T Reset ensure gas supply is turned on if SAP A01 x e Ignition failure problem persists call engineer mE Reset ensure sufficient water pressure if A02 Q imit thermostat fault problem persists call engineer A03 A Fan tacho signal fault Reset if problem persists call engineer GA Reset ensure sufficient water pressure if A04 Mj Q Insufficient system water pressure problem persists call engineer A06 AO DHW thermistor fault Reset if problem persists call engineer A07 QO Primary flow thermistor fault Reset if problem persists call engineer A08 A Primary Return thermistor fault Reset if problem persists call engineer A09 A Flue thermistor over temperature or flue thermistor Reset if problem persists call engineer S counter fault A11 A False flame Temporary A77 QOQ Low temperature thermostat fault Reset if problem persists call engineer P Preheating function active None P blinking Preheating function running None 4 WHAT IF 4 1 WHAT IF I SUSPECT A GAS LEAK If you suspect a gas leak turn off the gas supply at the gas meter and contact your installer or local gas supplier If you require further advice please contac
76. ordance with the following instructions 5 3 INITIAL FILLING OF THE SYSTEM Ensure both flow and return service valves are open remove appliance casing as described 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 8 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 Oncethe gauge has reached 1 BAR close both valves and begin venting all manual air release valves starting atthe 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 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 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 fol lowing checks
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78. r from the return inlet pipe Discon nect thermistor electrical plug Replace in the reverse order 6 11 PRINTED CIRCUIT BOARD fig 34 Carry out component removal procedure as described in 6 4 Pull the control fascia forward and lower it Push the clips P which secure the PCB cover remove cover after carefully tak ing note of all wiring connections and jumper tag configuration Unhook and remove connection block Q Disconnect all wiring from the PCB locate and remove the PCB securing screws remove the required PCB Replace in the reverse order ensur ing thatthe position of the 2 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 6 12 GAS VALVE fig 35 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 R must be discarded and replaced with new sealing washers Disconnect the compensation pipe S Locate and remove gas valve retaining screws T on the underside of the boiler if required the gas valve can now be removed Replace in the reverse order Check and adjust burner pressure settings WARNING A GAS T
79. r 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 bya 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 Once the appliance has been serviced the benchmark Service Record must be completed For UK only It is important that the Benchmark Service Record is correctly completed and handed to the user Failure to install and commission the appliance to the manufacturers instructions will invalidate the warranty To ensure the continued safe and efficient operation of the ap pliance it is recommended that it is checked and serviced at regular intervals To ensure correct and safe operation of the appliance it is essential that any worn or failed component be replaced only with a genuine Vok ra spare part It should be
80. 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 display normally shows the current time Refer to the main appliance status table for fault indicator and boiler status The integral digital time clock is used to switch the heating on and off at pre determined intervals 2 3 LIGHTING THE BOILER Ensure the 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 pro grammer the boiler will begin an ignition sequence When the 3 HOW TO 3 1 HOW TO TOP UP THE SYSTEM PRESSURE fig 1 2 Thesystem 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 topping up use the following instructions as a guide Locate the filling valve connections usually beneath the boiler see fig 3 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
81. re 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 Q2 locate and press the CO button see fig 46 pos SW1 Press the button the number of times according the function requirement as per 7 3 1 use the supplied dee el screwdriver to push the CN13 rad CO botton SW1 pT geg sz 7 3 1 CO FUNCTION SETTINGS Locate the CO button see 7 3 Select the main selector switch in position 9 CO FUNCTIONS ACTION ON THE BUTTON DISPLAY combustion analysis mode press once burner running at maximum heating ACO ill A gas valve maximun setting press twice burner running at maximum DHW ACO T A gas valve minimum setting press three time burner running at minimum ACO ill T A 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 9 position with the main selector switch 7 3 2 GAS VALVE MAXIMUM SETTING Setthe 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
82. reas 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 appliance and all water pipes connected to the appliance The drain cocks must be manufactured in accord ance 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 accom modate the increased volume of water when the system is heated It can accept up to 8 litres of expansion from within the system generally this is 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 should be 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
83. 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 Connect 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 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 acc
84. rol to Hot Water Cylinder Thermostat and Programmer Timer Combination Boiler Heating Zone Valves Fitted Not Required Hot Water Zone Valves Fitted Not Required Thermostatic Radiator Valves Fitted Not Required Automatic Bypass to System Fitted Not Required EN 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 Gas Rate L low OR L hw Burner Operating Pressure if applicable mbar OR Gas Inlet Pressure Le mbar Central Heating Flow Temperature C Central Heating Return Temperature C COMBINATION BOILERS ONLY Is the installation in a hard water area above 200ppm Yes No If yes has a water scale reducer been fitted Yes No What type of scale reducer has been fitted DOMESTIC HOT WATER MODE Measure and Record Gas Rate m hr OR ft hr Burner Operating Pressure at maximum rate jJ mbar OR Gas Inlet Pressure at maximum rate KH mbar Cold Water Inlet Temperature C Hot water has been checked at all outlets Yes Temperature e C Water Flow Rate limin CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer s instructions and or BS55
85. ry 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 46 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 amp CHARACTERIS TICS COMPONENT VALUE Fan 230Vac Bump 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 15 min Heating OFF hysterisis C SP 5
86. s produced as room sealed category IIZH3P 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 applications The Unica can also be used with the Voke ra twin flue system The Unica is approved for use with C13 amp C33 type flue ap plications 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 General layout Three porte valve actuator Drain valve Pressure switch Safety valve Pump Bottom auto air vent AAV Condense trap Return thermistor NTC Sensing Electrode High limit thermostat Flow thermistor NTC Top AAV De aerator Flue gas analysis test point Flue outlet amp air intake Ignition transformer Flues thermistor NTC Spark Electrode Burner Main heat exchanger Conveyor Fan assembly Mixer Expansion vessel Domestic hot water sensor Domestic hot water heat exchanger Condense trap Gas valve DHW flow meter OO JO Om P GA A
87. t 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 Instal lation 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 con nection must not be 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 appli ance 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 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 Refer to 10 freezing Particular attention should be paid to pipes passing through ventilated a
88. t 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 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 Ifyou 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 INSTALLATION AND SERVICING INSTRUCTIONS INTRODUCTION All installers are asked to follow the Benchmark Scheme by adhering to the Code of Practise which can be obtained from www centralheating co uk The Unica comprises a range of high efficiency combination boilers with outputs to DHW of 28kW and 32kW respectively These appliances by design incorporate electronic ignition circulating pump expansion vessel safety valve pressure gauge and automatic by pass The Unica range i
89. tandard Specification Domestic Gas Installations Declaration I S 813 3A 1 RELATED DOCUMENTS The installation of this boiler must be in accordance with the relevant requirements of the local 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 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 I S 813 for detailed guidance on this aspect A compartment used to enclose the appliance must be de signed and constructed specifically for this purpose An exist ing compartment cupboard may be utilised prov
90. 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 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 temperature 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 stabil ity 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 f
91. ue terminal Insert the terminal assembly 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 weatherproof ing The interior and exterior trim can now be fitted VERTICAL TERMINATION fig 25 The twin flue system must be converted to the dedicated con centric flue kit 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 ver tical flue terminal through the flashing plate from the outside ensuring thatthe collaron the flue terminal fits over the flashing Push fit the twin
92. visual inspection of components may also assist in locating the fault 7 7 3 POLARITY CHECK With the appliance connected to the electrical supply and us ing a suitable multimeter carry out the following voltage tests e connect test leads between the Live amp Neutral connections at the appliance terminal strip The meter should read ap proximately 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 ap proximately 230V ac If so proceed to next stage If not see 7 7 4 e connect test leads between the Neutral amp Earth connec tions at the appliance terminal strip The meter should read approximately 0 15Vac If so polarity is correct If not see 7 74 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 ISTANCE 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 than infinity there is a fault that must be isolated car
93. y Disconnect the flow M1 return N1 and condense connections on the heat exchanger Remove fan and mixer as described in 6 14 Locate and remove the 2 screws that secure the heat exchanger retaining clips and remove clips O1 Pull the heat exchanger forward and disconnect it from the flue collector P1 The heat exchanger can now be 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 fig 40 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 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 Should the removal and replacement of the expansion vessel be deemed impractical an external expansion vessel may be fitted to the return pipe as close to the appliance as possible 6 18 1 EXPANSION VESSEL REMOVAL with suf ficient clearance above fig 41 Carry out component removal procedure as described in 6 4 Disconnect the flue from the appliance Disconnect the expan sion vessel from the flexible expansion pipe Disconnect the flexible expansion pipe
94. y out component removal procedure as described in 6 4 Disconnect the outlet pipe I from the safety valve remove safety valve locking pin L from the hydraulic manifold Replace in the reverse order 6 7 LOWER AUTOMATIC AIR RELEASE VALVE fig 30 Carry out component removal procedure as described in 6 4 Remove the expansion pipe locking pin D from the pump as sembly and remove the expansion pipe Locate and remove the AAV locking pin G from the pump assembly and remove the AAV assembly H Replace in the reverse order 6 7 1 TOP AUTOMATIC AIR RELEASE VALVE fig 32 Carry out component removal procedure as described in 6 4 Unclip and remove the air chamber front cover Remove the AAV locking pin M from the deaerator assembly and remove the AAV assembly N Replace in the reverse order 6 8 WATER PRESSURE SWITCH fig 33 Carry out component removal procedure as described in 6 4 Locate and remove the locking pin O from the water pres sure switch Remove the wiring Carefully withdraw the switch Replace in the reverse order 6 9 FLOW THERMISTOR fig 4 pos 11 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 8 Carry out component removal procedure as described in 6 4 Unclip the return thermisto
95. ype 34 3 11 Showers 11 9 4 Gas supply 34 9 5 Gas supply installation 34 General requirements EIRE Page 9 6 Checking the CO and adjusting the gas valve 34 3A 1 Related documents 11 3A 2 Location of appliance 11 Benchmark 36 37 3A 3 Gas supply 11 3A 4 Flue system 11 3A 5 Air supply 12 3A 6 Water circulation 12 3A 7 Electrical supply 12 3A 8 Mounting on a combustible surface 12 3A 9 Timber framed buildings 12 3A 10 Inhibitors 12 3A 11 Showers 12 3A 12 Declaration of conformity 12 USERS INSTRUCTIONS INTRODUCTION Dear Customer Your Vok ra Unica 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 the boiler should not be used by children or unassisted disabled people 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 th

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