VOKERA Unica i36 User Instructions
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VOKERA Unica i36 User Instructions

High effi ciency combi boiler
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Unica i28 - i32 - i36
High effi ciency combi boiler
44
Users Instructions
Installation &
Servicing
Instructions
G.C. NUMBER
Unica i28 47 364 14
Unica i32 47 364 15
Unica i36 47 364 16
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Vokèra is a licensed member of the Benchmark scheme
Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.
commissioning of domestic hot water systems in the UK.

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  • Page 1 Unica i28 - i32 - i36 High effi ciency combi boiler Users Instructions Installation & Servicing Instructions G.C. NUMBER Unica i28 47 364 14 Unica i32 47 364 15 Unica i36 47 364 16 THESE INSTRUCTIONS TO BE RETAINED BY USER Vokèra is a licensed member of the Benchmark scheme...

  • Page 2: Table Of Contents

    Users instructions Things you should know Page Installation Page Gas appliances Delivery Electrical supply Contents Guarantee registration card Unpacking Appliance Log Book (UK only) Preparation for mounting the appliance How does it work? Fitting the fl ue Dimensions Connecting the gas & water Clearances required Electrical connections Frost protection system...

  • Page 3: Users Instructions

    NOTE The frost protection system is reliant on the appliance having a 1.6 DIMENSIONS permanent electrical supply, and being in a non-fault condition. Unica i28 Unica i32 Unica i36 1.9 APPLIANCE STATUS INDICATORS HEIGHT...

  • Page 4: Pressure Gauge

    Fig. 1 PRESSURE GAUGE DISPLAY MODE SELECTOR SWITCH HOT WATER TEMPERATURE HEATING TEMPERATURE SELECTOR SELECTOR 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...

  • Page 5: Digital Display

    DIGITAL DISPLAY Fig. 2 Symbol/Icon Description Displayed when heating mode is active Displayed when hot water mode is active Displayed when frost protection function is ac- tive Displayed when hot-water pre-heat function is enabled. Flashes when functioning Displayed if an alarm or fault has been detected Displayed when low system pressure has been detected Displayed when an external sensor is connected...

  • Page 6: Getting Started Page

    2. GETTING STARTED 2.1 BEFORE SWITCHING ON appliance reaches the CH set temperature, the burner will go Before switching the appliance on, please familiarise yourself off for a minimum period of approximately 3 minutes. with: When the programmer/time clock or external thermostats - how to isolate the appliance from the gas, water, and electricity heating request has been satisfi...

  • Page 7: What If

    FAULT CODES ALARM CODE CAUSE ACTION AUTOSTOP Call Landlord CALL FOR SERVICE Call Landlord Reset; ensure gas supply is turned on, if Ignition failure problem persists, call engineer. Reset; ensure suffi cient water pressure, if Limit thermostat fault problem persists, call engineer Fan tacho signal fault Reset;...

  • Page 8: Installation And Servicing Instructions

    INSTALLATION AND SERVICING INSTRUCTIONS INTRODUCTION Unica vertical applications. The can also be used with the All installers are asked to follow the Benchmark Scheme by Vokèra twin fl ue system. adhering to the Code of Practise, which can be obtained from Unica is approved for use with C13 &...

  • Page 9: Principle Components

    SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.1 PRINCIPLE COMPONENTS 1.5 SAFETY DEVICES  A fully integrated electronic control board featuring electronic temperature control, anti-cycle control, pump over-run, self- When the appliance is in use, safe operation is ensured by: diagnostic fault indicator, full air/gas modulation ...

  • Page 10: Central Heating

    SECTION 2 - TECHNICAL DATA 2.1 Central Heating Unica i28 Unica i32 Unica i36 Heat input (kW) 20.00 25.00 30.00 Maximum heat output (kW) 60/80°C 19.62 24.58 29.25 Minimum heat output (kW) 60/80°C 2.76 3.95 3.16 4.45 3.50 4.87 Maximum heat output (kW) 30/50°C 21.44...

  • Page 11: Effi Ciency

    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)

  • Page 12: Related Documents

    SECTION 3 - GENERAL REQUIREMENTS (UK) This appliance must be installed by a competent person in ac- BS 5440 Part 1, when the terminal is 0.5 metres (or less) below cordance with the Gas Safety (Installation & Use) Regulations. plastic guttering or 1 metre (or less) below painted eaves. 3.1 RELATED DOCUMENTS 3.5 AIR SUPPLY The installation of this boiler must be in accordance with the...

  • Page 13: Electrical Supply

    3.6.8 FREQUENT FILLING 3.11 SHOWERS Frequent fi lling or venting of the system may be indicative If the appliance is intended for use with a shower, the shower of a leak. Care should be taken during the installation of the must be thermostatically controlled and be suitable for use with appliance to ensure all aspects of the system are capable of a combination boiler.

  • Page 14: Air Supply

    3A.7 ELECTRICAL SUPPLY the terminal must be protected by a guard of durable material. The guard must be fi tted centrally over the terminal. Refer to The appliance is supplied for operation on 230V @ 50Hz electri- I.S. 813, when the terminal is 0.5 metres (or less) below plastic cal supply;...

  • Page 15: Delivery

    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 fl oor with the writing the correct way up. 4.2 CONTENTS Fig.

  • Page 16: Fitting The Flue

    4.5 FITTING THE FLUE The top fl ue outlet permits both horizontal and vertical fl ue ap- plications to be considered, alternatively, the Vokèra twin fl ue system can be utilised if longer fl ue runs are required. 4.5.1 CONCENTRIC HORIZONTAL FLUE (For concentric vertical fl...
  • Page 17 Attach the rear fl ue terminal to the appliance (using the pre- viously retained screws) and fi x 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, ensuring that the holes in the appliance back frame are aligned with the studs on the wall bracket.
  • Page 18 IMPORTANT 4.5.2 CONCENTRIC VERTICAL FLUE The vertical fl ue terminal is 1.0 metre in length and cannot be The appliance can be used with either the Vokèra condensing cut; therefore it may be necessary to adjust the height of the 60/100mm concentric fl...
  • Page 19 INSTALLATION OF TWIN ADAPTOR KIT (fi g. 22 & 23) NOTE  Insert the exhaust connection manifold (A) onto the appliance Seal the fl ue terminal assembly to the wall using cement or a fl ue outlet. suitable alternative that will provide satisfactory weatherproof- ...

  • Page 20: Connecting The Gas & Water

    4.6 CONNECTING THE GAS AND WATER Hot water outlet Fig. 26 The appliance is supplied with an accessory pack that includes cock service valves. The service valves are of the compression type. Cold water inlet The accessory pack contains sealing washers’ etc, for use with stopcock the service valves.

  • Page 21: Gas Supply Installation

    SECTION 5 - COMMISSIONING 5.1 GAS SUPPLY INSTALLATION analysis check to ensure that correct combustion is occurring. If there are no means to carry out a combustion analysis Inspect the entire installation including the gas meter, test for check, then it will not be possible to complete the commissio- tightness and purge.

  • Page 22: Final Checks

     by completing the warranty registration card and posting to • RE-FIT APPLIANCE CASING. us using the envelope supplied • COMPLETE BENCHMARK CHECKLIST.  online at: vokera.co.uk  for UK residents by calling: 0870 607 0281. FOR UK ONLY  for ROI residents by calling: 056 6655057.

  • Page 23: Pump Assembly

    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.

  • Page 24: Gas Valve

    - Reassemble the mixer with the fl ap in an horizontal position - Replace in the reverse order. - Check the number of fan speed INJECTOR Unica i28 4,7 fl ap side 3,4 fl ap side 6.13 ELECTRODES & CONDENSE SENSOR (fi g. 36)

  • Page 25: Main Heat Exchanger

    6.16 MAIN HEAT EXCHANGER (fi g. 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 assembly.

  • Page 26: Flue Collector Removal

    6.20 FLUE COLLECTOR REMOVAL (fi g. 43) Carry out component removal procedure as described in 6.16. Locate and remove the screw (A2) that secures the fl ue gas analysis test point cover (B2). Remove the clip and the fumes thermostat (C2). Locate and remove the screws (D2) that se- cure the fl...

  • Page 27: Checking Appliance Operation

    SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING 7.1 CHECKING APPLIANCE OPERATION temperature will fall whereby fan speed will increase relative to the output required. When the boiler has reached the set point When carrying out any repairs or servicing to the appliance, (+ hysterisis), the burner will switch off.

  • Page 28: Combustion Analysis Test

    7.3.1 CO FUNCTION SETTINGS Locate the CO button (see 7.3) Select the main selector switch in position FUNCTIONS ACTION ON THE BUTTON DISPLAY combustion analysis mode press once = burner running at maximum heating gas valve maximun setting press twice = burner running at maximum DHW gas valve minimum setting press three time = burner running at minimum NOTE...

  • Page 29: Fault Finding

    COMPONENT VALUES & CHARACTERISTICS dicated, a detailed continuity check will be required to trace the fault. A visual inspection of components may also assist in locating the fault. COMPONENT VALUE 230Vac 7.7.3 POLARITY CHECK Pump 230Vac With the appliance connected to the electrical supply and us- Valve actuator 230Vac ing a suitable multimeter, carry out the following voltage tests:...

  • Page 30: Adjustments

    ALARM CODE CAUSE ALARM TYPE ACTION AUTOSTOP Final Call Landlord CALL FOR SERVICE Temporary then Call Landlord fi nal Ignition failure, fl ame not sensed, Final Reset, check appliance operation internal fault Limit thermostat fault Final Reset, check appliance operation Fan tacho signal fault Final Reset check appliance operation, check...
  • Page 31 2800 2400 METHANE LIQUID GAS MINIMUM NUMBER OF 2000 GAS (G20) (G31) FAN ROTATIONS 1600 Unica i28 - i32 - i36 1200 table 3 Heat output (kW) SOFT LIGHT FAN METHANE LIQUID GAS SPEED GAS (G20) (G31) COs.a. curve (Qnheating)
  • Page 32 Unica i36 HTG curve (Qnheating) COs.a. curve (Qnheating) 6200 5800 5400 5000 4600 4200 3800 3400 3000 2600 2200 1800 1400 1000 Heat output (kW) Heat output (kW) 7.10.1 CHECKING THE FAN SPEED REFERENCE REFERENCE Locate the CO button (see Fig 43). TEMPERATURE 15 °C TEMPERATURE 20 °C Select the main selector switch to the ON position, press the...

  • Page 33: Historical Alarms

    Climatic Curves External Temperature (°C) 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.

  • Page 34: External Wiring

    Vokera Ltd. The appliance can be used with the following controls: OT+ control (fi g. 49), please contact Vokera • technical for detailed instruction on specifi c OT+ controls.
  • Page 35 FUNCTIONAL DIAGRAM Fig. 51...

  • Page 36: Related Documents

    BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW 9.2 TECHNICAL DATA Gas Pressures Unica i28 Unica i32 Unica i36 Inlet pressure 37.0 mbar 37.0 mbar 37.0 mbar Heating maximum gas rate (kg/hr) 1.55...
  • Page 37 9.6.2 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 the CO reading is incorrect, the maximum gas pressure must be adjusted as follows:...

  • Page 38: Commissioning

    LPG) separate guidance will be provided by the must have the relevant competence for use of the analyser. Vokera technical help line and must be followed. Check and zero the analyser IN FRESH AIR, as per analyser manufacturer’s instructions.

  • Page 39: Benchmark

    Benchmark Commissioning and Servicing Section It is a requirement that the boiler is installed and commissioned to the completed in full. www.centralheating.co.uk © Heating and Hotwater Industry Council (HHIC)

  • Page 40: Gas Boiler System Commissioning Checklist

    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. CONTROLS Optimum start control Fitted...
  • Page 41 SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider SERVICE 01 SERVICE 02 ² % ² % ² % ² % SERVICE 03 SERVICE 04 ² % ²...
  • Page 44 Registered address: Vokèra Ltd Borderlake House Unit 7 Riverside Industrial Estate London Colney Herts AL2 1HG enquiries@vokera.co.uk www.vokera.co.uk www.vokera.ie Sales, General Enquires T 0844 391 0999 F 0844 391 0998 Vokèra Ireland West Court, Callan Co Kilkenny T 056 7755057 F 056 7755060 Vokèra Limited reserve the right to change...

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