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Excel
High efficiency combi boiler
Users Instructions
Installation &
Servicing
Instructions
Excel 25 G.C. N° 47-364-12
Excel 29 G.C. N° 47-364-13
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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Table of Contents
Related Manuals for VOKERA Excel 25
Summary of Contents for VOKERA Excel 25
- Page 1 Excel High efficiency combi boiler Users Instructions Installation & Servicing Instructions Excel 25 G.C. N° 47-364-12 Excel 29 G.C. N° 47-364-13 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 Installation Page Things you should know Page Delivery Gas appliances Contents Electrical supply Unpacking Guarantee registration card Preparation for mounting the appliance Appliance Log Book (UK only) Fitting the flue How does it work? Connecting the gas & water Dimensions Electrical connections Clearances required... -
Page 3: Users Instructions
1. THINGS YOU SHOULD KNOW 1.1 GAS APPLIANCES 1.6 DIMENSIONS Gas Safety (Installations and Use) Regulations (UK). Excel 25-29 In the interests of your safety and that of others it is a legal requirement that all gas appliances are installed and correctly HEIGHT... -
Page 4: Controls Overview
Fig. 1 MODE SELECTOR SWITCH HEATING TEMPERATURE TEMPERATURE HYDROMETRE SELECTOR SELECTOR GREEN LED YELLOW LED RED LED BOILER STATUS LED Green LED Boiler is working/responding to a heating/hot water request Red LED Boiler has identified a fault and has failed-safe. Refer to instructions on how to reset Yellow LED Service operation DHW TEMPERATURE SELECTOR Move the selector clockwise to increase the hot water outlet temperature, or counter-clockwise to reduce the temperature... -
Page 5: Getting Started Page
2. GETTING STARTED 2.3 LIGHTING THE BOILER 2.1 BEFORE SWITCHING ON Ensure the gas and electrical supply to the boiler are Before switching the appliance on, please familiarise yourself turned on. with: Turn the mode selector switch to the ON position. When there - how to isolate the appliance from the gas, water, and electricity is a request for heating or hot water via the time clock or pro- supplies;... -
Page 6: Appliance Status Led And Fault Codes
APPLIANCE STATUS LED AND FAULT CODES Alarm type Led RED Led YELLOW Led GREEN Action Purge cycle mode active BLINKING BLINKING BLINKING Alarm high limit thermostat Final BLINKING Reset appliance. Call engineer if fault re-occurs Alarm system water pressure Final Check/refill system pressure, reset, check. -
Page 7: Installation And Servicing Instructions
INSTALLATION AND SERVICING INSTRUCTIONS INTRODUCTION – horizontally – through 360 degrees for various horizontal All installers are asked to follow the Benchmark Scheme by or vertical applications. The Excel can also be used with the adhering to the Code of Practise, which can be obtained from Vokèra twin flue system. -
Page 8: Principle Components
SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.5 SAFETY DEVICES 1.1 PRINCIPLE COMPONENTS When the appliance is in use, safe operation is ensured by: • A fully integrated electronic control board featuring electronic • a water pressure switch that monitors system water pressure temperature control, anti-cycle control, pump over-run, self- and will de-activate the pump, fan, and burner should the diagnostic fault indicator, full air/gas modulation... -
Page 9: Central Heating
SECTION 2 - TECHNICAL DATA 2.1 Central Heating Excel 25 Excel 29 Heat input (kW) 20.00 25.00 Maximum heat output (kW) 60/80°C 19.50 24.45 Minimum heat output (kW) 60/80°C 4.91 5.90 Maximum heat output (kW) 30/50°C 20.84 26.23 Minimum heat output (kW) 30/50°C 5.36... -
Page 10: Pump Duty
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 11: 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 12: Electrical Supply
3.6.8 FREQUENT FILLING control Frequent filling or venting of the system may be indicative valve of a leak. Care should be taken during the installation of the control temporary valve appliance to ensure all aspects of the system are capable of connection withstanding pressures up to at least 3 bar. -
Page 13: Air Supply
method of connection to the mains electricity supply must allow the terminal must be protected by a guard of durable material. for complete isolation from the supply. The preferred method is The guard must be fitted centrally over the terminal. Refer to by using a double-pole switch with a contact separation of at I.S. -
Page 14: Delivery
SECTION 4 - INSTALLATION 29450126 1000mm extension 1000mm 4.1 DELIVERY 29450127 2000m extension 2000mm Due to the weight of the appliance it may be necessary for 29450128 Telescopic extension 372/519mm two people to lift and attach the appliance to its mounting. The Wall bracket pack (5) 208mm appliance is contained within a heavy-duty cardboard carton. - Page 15 4.5.2 CONCENTRIC VERTICAL FLUE The appliance can be used with either the Vokèra condensing 60/100mm concentric flue system or the optional 80/125mm concentric flue system. NOTE These instructions relate only to the Vokèra 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.
- Page 16 IMPORTANT Once the bracket has been secured to the wall, mount the ap- The vertical flue terminal is 1.0 metre in length and cannot be pliance onto the bracket. cut; therefore it may be necessary to adjust the height of the appliance to suit or use a suitable extension.
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Page 17: Connecting The Gas & Water
• 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 that the collar on the flue terminal fits over the flashing. -
Page 18: Electrical Connections
The appliance comes with a factory fitted connector plug to allow C/H flow Quick and easy connection to the Vokera time clock. If it is an- ticipated that external controls will be required please refer to valve the wiring diagrams in section 8 for more detailed information. -
Page 19: Gas Supply Installation
SECTION 5 - COMMISSIONING 5.1 GAS SUPPLY INSTALLATION • ensure the proper electrical checks have been carried out, (see 7.8) particularly continuity, polarity and resistance to Inspect the entire installation including the gas meter, test for earth; tightness and purge. Refer to BS 6891 (I.S. 813 in ROI) for •... -
Page 20: Regulating The Central Heating System
Explain to the user that for continued safe and efficient operation, The boiler is supplied with the following flow restrictor. the appliance must be serviced annually by a competent person. Excel 25: 8 - litres flow restrictor IMPORTANT Excel 29: 10 - litres flow restrictor To validate the appliance warranty, it’s necessary to register... -
Page 21: Component Removal Procedure
6.4 COMPONENT REMOVAL PROCEDURE To remove a component, access to the interior of the appliance is essential. Isolate the appliance from the electrical supply and remove the fuse. And when necessary, close all service valves on the appliance, remove the appliance casing as described in section 4.7.1 and drain the water content from the appliance via the drain valve. -
Page 22: Gas Valve
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 (P). Disconnect all wiring from the PCB, locate and remove the PCB securing screws, remove the required PCB. Replace in the reverse order ensur- ing that the position of the 2 control knobs are correctly aligned with the respective potentiometers on the PCB. -
Page 23: Main Heat Exchanger
6.16 MAIN HEAT EXCHANGER (fig. 29) Carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Locate and remove the gas pipe locking pin (A1) and swing/rotate the gas pipe away from the fan assembly (B1), (if necessary unscrew the gas pipe from the gas valve G1). -
Page 24: Flue Collector Removal
6.20 FLUE COLLECTOR REMOVAL (fig. 33) Carry out component removal procedure as described in 6.4. Remove the air chamber front cover. Remove the heat exchang- er as per 6.16. Locate and remove the screw (Y1) that secures the flue gas analysis test point cover (Z1). Disconnect the flues thermistor wiring connections. -
Page 25: Checking Appliance Operation
SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING 7.1 CHECKING APPLIANCE OPERATION burner will re-light. NOTE When carrying out any repairs or servicing to the appliance, If the spark/sensing electrode does not sense ignition the appli- the relevant commissioning procedure must be undertaken to ance will re-attempt ignition a further 4-times then go to lockout. -
Page 26: Combustion Analysis Test
Note: If a measured CO/CO2 ratio of 0.004/1 or less AND a wires and connectors for continuity and integrity. CO reading of less than 350ppm cannot be achieved, please contact Vokera technical for advice. 7.7.2 SHORT CIRCUIT CHECK Isolate the appliance from the electrical supply, and using a 7.5 CHECKING THE EXPANSION VESSEL... -
Page 27: 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 •... -
Page 28: External Wiring
SECTION 8 - WIRING DIAGRAMS 8.1 EXTERNAL WIRING The appliance comes supplied with a time clock to allow opera- tion 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. -
Page 29: Functional Diagram
FUNCTIONAL DIAGRAM Fig. 41 NOTE: L-N-E connection is advisable... -
Page 30: 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 Excel 25 Excel 29 Inlet pressure 37.0 mbar 37.0mbar Heating maximum gas rate (kg/hr) 1.55... - Page 31 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 34 As part of the installation process, ESPECIALLY WHERE A FLUE HAS BEEN FITTED BY PERSONS OTHER THAN THE BOILER contact with Vokera technical. If any such INSTALLER, visually check the integrity of the whole flue adjustment is recommended and further...
- Page 36 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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