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Unica i28 - i32
High efficiency combi boiler
40
Users Instructions
Installation &
Servicing
Instructions
G.C. NUMBER
Unica i28 47 364 14
Unica i32 47 364 15
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.
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Summary of Contents for VOKERA Unica i28
- Page 1 High efficiency combi boiler Users Instructions Installation & Servicing Instructions G.C. NUMBER Unica i28 47 364 14 Unica i32 47 364 15 THESE INSTRUCTIONS TO BE RETAINED BY USER Vokèra is a licensed member of the Benchmark scheme which aims to improve the standards of installation and...
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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 flue 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 - i32 1.9 APPLIANCE STATUS INDICATORS HEIGHT 780 mm Your boiler is equipped with a large LCD display that indicates... -
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 satisfied, the appliance will switch supplies;... -
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 sufficient 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 All installers are asked to follow the Benchmark Scheme by vertical applications. The can also be used with the adhering to the Code of Practise, which can be obtained from Vokèra twin flue system. Unica www.centralheating.co.uk. -
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 28i Unica 32i Heat input (kW) 20.00 25.00 Maximum heat output (kW) 60/80°C 19.62 24.58 Minimum heat output (kW) 60/80°C 2.76 3.95 3,16 4,45 Maximum heat output (kW) 30/50°C 21.44 26.70 Minimum heat output (kW) 30/50°C 3.00 4.20... -
Page 11: Efficiency
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 filling 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 fitted 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 floor with the writing the correct way up. 4.2 CONTENTS Fig. -
Page 16: Fitting The Flue
4.5 FITTING THE FLUE The top flue outlet permits both horizontal and vertical flue ap- plications to be considered, alternatively, the Vokèra 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). - Page 17 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, 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 flue 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 flue system or the optional 80/125mm appliance to suit or use a suitable extension.
- Page 19 INSTALLATION OF TWIN ADAPTOR KIT (fig. 22 & 23) NOTE • Insert the exhaust connection manifold (A) onto the appliance Seal the flue terminal assembly to the wall using cement or a flue outlet. suitable alternative that will provide satisfactory weatherproof- • Remove the blanking plate (located to the left of the appliance ing.
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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 If there are no means to carry out a combustion analysis check, then it will not be possible to complete the commissioning Inspect the entire installation including the gas meter, test for procedure. -
Page 22: Final Checks
• by completing the warranty registration card and posting to us using the envelope supplied FOR UK ONLY • online at: vokera.co.uk Complete details of the boiler, controls, installation and com- • for UK residents by calling: 0870 607 0281. -
Page 23: Pump Assembly
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. -
Page 24: Gas Valve
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. -
Page 25: Main Heat Exchanger
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 assembly. -
Page 26: Flue Collector Removal
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). Locate 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. -
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 & CHARACTERIS- the fault. A visual inspection of components may also assist in locating the fault. TICS 7.7.3 POLARITY CHECK COMPONENT VALUE With the appliance connected to the electrical supply and us- 230Vac ing a suitable multimeter, carry out the following voltage tests: Pump 230Vac • connect test leads between the Live &... - Page 30 ALARM CODE CAUSE ALARM TYPE ACTION AUTOSTOP Final Call Landlord CALL FOR SERVICE Temporary then Call Landlord final Ignition failure, flame 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 fan...
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Page 31: Adjustments
GAS (G20) (G31) - turn the heating water temperature selector to set the re- quired value Unica i28 heating - DHW 45 - 61 45 - 61 - press the CO button and then skip to the calibration of the next parameter. - Page 32 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) Curva portata termica - giri ventilatore HTG curve (Qnheating) Curva portata termica - emissioni CO Caldaia Unica i28 Caldaia Unica i28 6400 6000 5600 5200...
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Page 33: Historical Alarms
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
For advice on controls that are not featured in this would suggest removing the factory fitted male connector wires for ease of installation. Further book, please contact Vokera technical on 0844 guidance on the recommended practice for the 391 0999. - Page 35 FUNCTIONAL DIAGRAM Fig. 51...
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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 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... - Page 37 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 the CO reading is incorrect, the maximum gas pressure must be adjusted as follows:...
- Page 40 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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Questions and answers
How to switch the boiler onto winter mode
To switch the VOKERA Unica i28 boiler to winter mode, you need to:
1. Ensure the appliance is connected to gas, water, and electricity supplies.
2. Use the mode selector switch on the lower front of the boiler to set it to “heating and hot water” mode.
3. Adjust the central heating temperature by rotating the temperature selector clockwise to increase the temperature (between 40°C and 80°C).
4. Set the time clock or external thermostat (if fitted) to your desired heating schedule.
This enables both heating and hot water functions, suitable for winter use.
This answer is automatically generated
How to turn the boiler onto summer mode
To switch the VOKERA Unica i28 boiler to summer mode, rotate the function selector to the hot water only position. This disables central heating while keeping domestic hot water available.
This answer is automatically generated