VOKERA Mynute 25 A User Instructions
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VOKERA Mynute 25 A User Instructions

High efficiency system boiler
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Mynute 25 A
High efficiency system boiler
Users Instructions
Installation &
Servicing
Instructions
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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  • Page 1 Mynute 25 A High efficiency system boiler Users Instructions Installation & Servicing Instructions 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.

  • 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

    1. THINGS YOU SHOULD KNOW 1.1 GAS APPLIANCES 1.6 DIMENSIONS Gas Safety (Installations and Use) Regulations (UK). Mynute 25 A In the interests of your safety and that of others it is a legal HEIGHT 715 mm requirement that all gas appliances are installed and correctly...
  • Page 4 Fig. 1 YELLOW LED RED LED HYDROMETRE GREEN LED MODE SELECTOR SWITCH HEATING TEMPERATURE SELECTOR BOILER STATUS LED Green LED Boiler is working/responding to a heating/hot water request Red LED Boiler has identified a fault and has failed-safe. Refer to instructions on how to reset Yellow LED Service operation PRESSURE GAUGE Ensure the system pressure is set correctly (minimum 0.5-bar)

  • Page 5: Getting Started

    2. GETTING STARTED Ensure the gas and electrical supply to the boiler are turned on. 2.1 BEFORE SWITCHING ON Turn the mode selector switch to the ON position. When there Before switching the appliance on, please familiarise yourself with: is a request for heating or hot water via the time clock or - how to isolate the appliance from the gas, water, and elec- programmer, the boiler will begin an ignition sequence.

  • Page 6: What If

    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 also be used with the Vokèra twin flue system. The Mynute comprises a range of high-efficiency combination The Mynute is approved for use with C13 & C33 type flue boilers with outputs of 25kW. These appliances – by design applications.

  • Page 8: Principle Components

    SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.1 PRINCIPLE COMPONENTS • A fully 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 •...

  • Page 9: Technical Data

    SECTION 2 - TECHNICAL DATA 2.1 Central Heating Heat input (kW) 25.00 Maximum heat output (kW) 60/80°C 24.40 Minimum working pressure 0.5 bar Maximum working pressure 2.7 bar 2.2 Gas Pressures Inlet pressure (G20) 20.0 mbar Heating maximum gas rate (m /hr) 2.64 Minimum gas rate (m...

  • 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: General Requirements (Uk)

    SECTION 3 - GENERAL REQUIREMENTS (UK) This appliance must be installed by a competent person in people have access (including balconies or flat roofs) the accordance with the Gas Safety (Installation & Use) terminal must be protected by a guard of durable material. Regulations.

  • Page 12: Electrical Supply

    with an approved non-return valve and stopcock for isolation 3.11 SHOWERS purposes. The feed pipe should be connected to the return If the appliance is intended for use with a shower, the shower pipe as close to the boiler as possible. must be thermostatically controlled and be suitable for use 3.6.8 FREQUENT FILLING with a combination boiler.

  • Page 13: Air Supply

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

  • Page 14: Contents

    SECTION 4 - INSTALLATION 4.1 DELIVERY 29450127 2000m extension 2000mm 29450128 Telescopic extension 350/730mm Due to the weight of the appliance it may be necessary for two Wall bracket pack (5) 208mm people to lift and attach the appliance to its mounting. The 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. NOTE These instructions relate only to the Vokèra condensing 60/ 100mm concentric flue system. The vertical flue terminal can be connected directly to the appliance flue outlet.
  • Page 16 IMPORTANT Once the bracket has been secured to the wall, mount the The vertical flue terminal is 1.0 metre in length and cannot be appliance onto the bracket. cut; therefore it may be necessary to adjust the height of the appliance to suit or use a suitable extension.

  • Page 17: Connecting The Gas & Water

    pushed 50mm onto the male spigots of the concentric to twin converter. NOTE Seal the flue terminal assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing. The interior and exterior trim can now be fitted.

  • Page 18: Electrical Connections

    • store the casing and screws safely until required. Re-fit in the reverse order • gently lower the control fascia until it rests. Safety valve outlet 4.7.2 APPLIANCE TERMINAL BLOCK The appliance terminal block is located on the rear of the control fascia.

  • Page 19: Gas Supply Installation

    SECTION 5 - COMMISSIONING (see 7.8) particularly continuity, polarity and resistance to 5.1 GAS SUPPLY INSTALLATION earth; Inspect the entire installation including the gas meter, test for • ensure the 3 AMP fuse – supplied with the appliance – has tightness and purge.

  • Page 20: Regulating The Central Heating System

    • by completing the warranty registration card and posting to CORRECTLY AND IS PROPERLY SECURED. us using the envelope supplied • ENSURE ALL PIPE WORK IS RE-CHECKED FOR • online at: vokera.co.uk TIGHTNESS. • for UK residents by calling: 0870 607 0281 • RE-FIT APPLIANCE CASING.

  • Page 21: Pump Assembly

    6.5 PUMP ASSEMBLY (fig. 21) Carry out component removal procedure as described in 6.4. Disconnect and remove the pump outlet pipe (A) from the pump assembly/combustion chamber connection. Remove the expansion pipe locking pin (B) from the top of the pump assembly and withdraw the flexible pipe.

  • Page 22: Gas Valve

    6.12 GAS VALVE (fig. 26) Carry out component removal procedure as described in 6.4. The gas valve must be changed as complete unit. Disconnect the electrical plug and leads from the gas valve, slacken and unscrew gas valve inlet and outlet connections. Please note, the sealing washers (Q) must be discarded and replaced with new sealing washers.

  • 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 exchanger 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: Checks, Adjustments And Fault Finding

    SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING the temperature of the flow sensor falls below the set point 7.1 CHECKING APPLIANCE OPERATION (- hysterisis), the burner will re-light. When carrying out any repairs or servicing to the appliance, the NOTE relevant commissioning procedure must be undertaken to If the spark/sensing electrode does not sense ignition the...

  • Page 26: 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 LED STATUS combustion analysis mode press once = burner running at maximum heating yellow led blinking gas valve maximun setting (*) press twice = burner running at maximum absolute yellow led blinking + red led fixed gas valve minimum setting...

  • Page 27: Fault Finding

    NOTE COMPONENT VALUES & Should it be found that the fuse has failed but no fault is CHARACTERISTICS indicated, a detailed continuity check will be required to trace the fault. A visual inspection of components may also assist in COMPONENT VALUE locating the fault.

  • Page 28: Wiring Diagrams

    If external controls are to be added to the system, they must be connected to the appliance as shown in the following diagrams. For advice on controls that are not featured in this book, please contact Vokera technical on 0844 3910999 8.1.1...

  • Page 29: Functional Diagram

    FUNCTIONAL DIAGRAM Fig. 40 NOTE: L-N-E connection is advisable...

  • Page 30: Exploded Diagrams

    SECTION 9 - EXPLODED DIAGRAMS Table 1 POS. DESCRIPTION Frame assembly 20011411 Quick primer pressure gauge 20005580 Control panel cover 20026055 Printed circuit board 20025735 led light guide 20013352 Instrumental panel 20035501 Knob 20013055 Case Assembly 20026073 Fixing flange 20023928 Fuse R3478 Power wiring harness...

  • Page 31: Table 2

    Table 2 POS. DESCRIPTION By-pass casing R10024641 By-pass valve R2047 Heating manifold and cartridge R10027768 3 way valve cartridge R10025305 Clip R10025450 Safety valve R10025055 Heating cock R1789 Cover for by-pass assembly R10024643 Cock R10024646 Pipe 20025755 Washer R5026 Washer R5237 Ring R6898...

  • Page 32: Table 3

    Table 3 POS. DESCRIPTION Expansion vessel 20029826 Pipe R10028603 Pump R10027571 Air vent bottle R10025485 Pipe 20025763 Exchanger group 20026081 Pipe 20025764 Pipe 20025744 Air vent valve 20019768 Siphon 20025733 Pipe 20025743 Degasser kit 20019888 Racord 20025762 Flexible pipe R10027545 Pipe 20025746 Vent plug...

  • Page 33: Table 4

    Table 4 POS. DESCRIPTION 20002995 Burner assembly 20026079 Ignition electrode 20025737 Pipe 20025745 Gas valve 20025752 Gas pipe 20005553 3/4" gas cock R10020897 Combustion chamber cover 20005594 Plug 20005550 Hole cover 20005586 Seal ignition electrode 20025740 Gas diaphragm R10029209 Mixer 20026083 Washer 20025753...

  • Page 34: Table 5

    Table 5 POS. DESCRIPTION Conveyor 20026060 Flue drain connection R10028421 Outlet nut 20026049 Plug 20026058 Flue cllector 20026056 O ring R10023533 Washer Ø 60 R10026345 Washer Ø 60 R10028426 Flue sensor 20007050 Washer 20026059 Combustion cable 20025736...

  • Page 35: Related Documents

    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 Mynute 25 A Inlet pressure 37.0mbar Heating maximum gas rate (kg/hr) 1.94 Minimum gas rate (kg/hr) 0.47...

  • Page 36: 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. Failure to install and commission this equipment to the manufacturer’s instructions may invalidate the warranty but does not affect statutory rights.

  • Page 37: Benchmark

    SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions.
  • 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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