VOKERA MYNUTE 24m Installation & Servicing Instructions Manual
  1. Manuals
  2. Brands
  3. VOKERA Manuals
  4. Boiler
  5. Mynute
  6. Installation & servicing instructions manual

VOKERA MYNUTE 24m Installation & Servicing Instructions Manual

Hide thumbs Also See for MYNUTE 24m:
Table of Contents

Advertisement

Quick Links

See also: Instructions for Using
Mynute 24m
Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MYNUTE 24m and is the answer not in the manual?

Questions and answers

Related Manuals for VOKERA MYNUTE 24m

Summary of Contents for VOKERA MYNUTE 24m

  • Page 1 Mynute 24m Installation & Servicing Instructions THESE INSTRUCTIONS TO BE RETAINED BY USER...

  • Page 2: Table Of Contents

    Contents Checks, adjustments and fault finding Page Design principles & operating sequence Page Principle components Checking appliance operation Mode of operation Appliance mode of operation Checking and adjusting burner pressure Safety devices Combustion analysis test Technical data Page Checking the expansion vessel External faults Central heating Electrical checks...
  • Page 3 INTRODUCTION The Vokera Mynute 24m is a central heating boiler, which or vertical applications. The Mynute 24m can also be used - by design- incorporates electronic ignition, circulating with the Vokera twin flue system. pump, expansion vessel, safety valve, pressure gauge This appliance is designed for use with a sealed system and automatic by-pass.

  • Page 4: Design Principles & Operating Sequence

    Thereafter, the boiler’s output will either be increase to maximum or modulate to suit the set requirement. main heat primary exchanger NTC sensor burner gas valve expansion vessel water pressure switch circulator discharge valve safety automatic valve by-pass Fig. 2 return flow Mynute 24m...

  • Page 5: Technical Data Page

    Nox (max-min) 140-110 ppm CO (max-min) 100-130 ppm (max-min) 6,95-2,60% CO/CO ratio (max) 0,0014 to 1 CO/CO ratio (min) 0,005 to 1 Ref. Condition 15 °C , 1013,25 mbar, dry gas NOTE: L.P.G. data refer to section 10 Mynute 24m...

  • Page 6: Pump Duty

    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 Fig. 4 Mynute 24m...

  • Page 7: Related Documents

    An existing compartment/cupboard may be utilised provided that it is modified to suit. Details of essential features of compartment/cup- board design including airing cupboard installations are given in BS 6798. This appliance is not suitable for external installation. Mynute 24m...

  • Page 8: Air Supply

    5-metres Institute of Gas Engineers publication (IGE UP/7) above the boiler (see fig. 5). “Guide for Gas Installations in Timber Frame Build- ings”. Mynute 24m...

  • Page 9: Inhibitors

    3.11 INHIBITORS Vokera recommend that a inhibitor - suitable for use with copper heat exchangers - is used to protect the boiler and system from the effects of corrosion and/ or electrolytic action. The inhibitor must be admin- istered in strict accordance with the manufacturers* instructions.

  • Page 10: Air Supply

    These must be located in accessible positions to 3A.11 INHIBITORS facilitate draining of the appliance and all water Vokera recommend that a inhibitor - suitable for pipes connected to the appliance. use with copper heat exchangers - is used to protect the boiler and system from the effects of 3A.6.4 AIR RELEASE POINTS...

  • Page 11: Installation

    The top flue outlet permits both horizontal and Dimension “X” Fig. 7 vertical flue applications to be considered, alterna- tively, the Vokera twin flue system can be utilised 4.5.1.1 FITTING THE HORIZONTAL FLUE KIT (see if longer flue runs are required. 4.5.1) Carefully measure the distance from the centre 4.5.1...
  • Page 12 (fig. 8 & 8A). plate from the outside, ensuring that the collar on The interior trim should be fitted at this point. the flue terminal fits over the flashing. The fixing holes for the wall-mounting bracket Mynute 24m...
  • Page 13 4.5.3 TWIN FLUE SYSTEM manifold. The Vokera twin flue system enables greater flue • • • • • Remove the required blanking plate (located to distances to be achieved (see 4.4.2) than that of the left and right of the appliance flue outlet) and a concentric flue system.
  • Page 14 Fig. 12 4.5.3.4 VERTICAL TERMINATION (fig. 13) The twin flue system must be converted to the dedicated concentric flue kit for termination. • The vertical terminal is supplied with a built-in Fig. 11 converter box and cannot be shortened. Mynute 24m...

  • Page 15: Connecting The Gas & Water

    • store the casing and screws safely until re- quired. Re-fit in the reverse order. 4.6.1 GAS (fig. 6) The appliance is supplied with a 15 mm service Mynute 24m...
  • Page 16 8). Re-fit the electrical input board cover. The securing screw on the cable anchorage should now be tightened. This must be done before the control fascia is re-fitted in. NOTE This appliance requires a permanent live supply. Mynute 24m...

  • Page 17: Commissioning

    *Both Sentinel and Fernox manufacture products valves, starting at the lowest first. It may be that have proved suitable for use with Vokera ap- necessary to go back and top-up the pressure until pliances. Vokera Ltd. cannot comment on the suit- the entire system has been filled.

  • Page 18: Final Checks

    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 serv- iced annually by a competent person. Mynute 24m...

  • Page 19: General

    It is the law that any servicing work is carried out some water absorbent cloths are available to by competent person such as Vokera engineer, catch any residual water that may drip from the an approved service agent, British Gas or other appliance or removed component.

  • Page 20: Checks, Adjustments And Fault Finding

    2.2. If adjustment is required, remove the protective cap from the gas valve modulating coil assembly and turn the outer (10mm) nut clockwise to increase, or counter-clockwise to Fig. 18 decrease the burner pressure. Mynute 24m...

  • Page 21: Checking The Expansion Vessel

    • • • • • connect test leads between the Live & Neutral connections at the appliance terminal strip (fig.16); the meter should read approximately 230V ac. If so proceed to next stage. If not, see section 7.7.4. Mynute 24m...

  • Page 22: Fault Finding

    BETWEEN THE ROOM FLOW SWITCH OR THERMOSTAT INPUT CHECK FLUE GAS TUBE CHECK WIRING OR CONNECTIONS CHECK WIRING AND BETWEEN TERMINAL CONNECTIONS OR CHECK IDRAULIC RESTART THE STRIP AND CONTROL REPLACE WIRING WATER PRESSURE CIRCUIT TEST BOARD OR CONNECTIONS SWITCH Mynute 24m...
  • Page 23 BETWEEN TERMINALS CN8.4 & CN8.5 ON PCB THERE 0 VCC BETWEEN TERMINALS CN9.1 & CN9.2 ON PCB CHECK WIRING AND CHECK WIRING AND CONNECTIONS ,WATER CONNECTIONS OR REPLACE PRESSURE SWITCH AND AIR PRESSURE SWITCH CONTROL BOARD HYDRAULIC CIRCUIT Mynute 24m...
  • Page 24 REPLACE THE 11 mmCH2O MAINS CONTROL BOARD ON E.V.G. CHECK REPLACE AIR FLOW SWITCH CHECK WIRING CHECK WIRING AND CHECK THE FAN CONNECTIONS OR AND/OR FLUE GAS CONNECTIONS EVG OK HIGH LIMIT THERMOSTAT TUBE REPLACE EVG CHECK GAS Mynute 24m...
  • Page 25 CN9.4 ON PCB IS < 1.2 Vdc SWITCH CH THERMOSTAT AT MIN. IS THE D.H.W. RESISTENCE OF TEMPERATURE MODULATOR COIL >80 °C ABOUT 70/80 REPLACE CONTROL BOARD C.H. NTC REPLACE REPLACE REPLACE MODULATOR COIL CONTROL BOARD C.H. NTC Mynute 24m...
  • Page 26 OPEN THE LINK BETWEEN BLACK & BLACK WIRES AT BOILER TERMINAL WATER FLOW STRIP. TEMPERATURE >80 °C BURNER AND FAN SWITCH C.H. NTC REPLACE CONTROL BOARD REPLACE CONTROL BOARD WAIT 30 SECS. REPLACE C.H. NTC PUMP SWITCH REPLACE CONTROL BOARD Mynute 24m...

  • Page 27: Wiring Diagrams

    If external controls are to be added book, please contact Vokera technical on 0870 to the system, they must be connected to the 333 0520.

  • Page 28: Connection On External Time-Clock

    7.11 prior to refitting the PCB cover and appli- ance casing. CONNECTION OF AN INTEGRAL TIME CLOCK The Vokera integral time clock (Part no. 433) should be installed as shown in diagram 19B. If a room thermostat is to be connected, it should be of the ‘voltage-free’...

  • Page 29: Exploded Diagrams

    10023044 Cover 10024173 Ignition module 10022174 Printed Circuit Board 10025340 Led Light Guide 10023816 Instrumental panel 10027015 Knob 10023818 Knob 10023817 Case 10023822 Door panel 10023810 Cover assembly 01005261 Fuse 3478 Edge clip Transformer 10021272 Wiring harnes 10023840 Mynute 24m...
  • Page 30 Connection 10022658 Pressure switch 2044 By-pass valve 2047 Safety valve 2907 Connection 10022499 Heating cock 1789 Venting plugs kit 01005137 Pipe 10020898 O ring 6898 Clip 2223 Clip 2165 Clip 2222 Connection 2217 Ogive 1824 Wiring harnes 10026771 Mynute 24m...
  • Page 31 POS. DESCRIPTION Expansion vessel 2204 Flexible pipe 10023603 Pump 10024573 Pipe 10022000 Heat exchanger 10023651 Pipe 10022002 Washer 2226 Washer 5026 NTC sensor 8484 Clip 2223 Clip 2165 Washer 10022726 Limit thermostat 10024710 Mynute 24m...
  • Page 32 Roomsealed chamber 10024669 Clip 0442 Main burner injector manifold 10025271 Burner 10025270 Spark electrode 10025985 Pipe 10023996 Gas valve 10025074 Gas valve solenoid 10020838 Gas cock 10020897 Cover assembly 10024779 Glass 10021558 Air box hole cap 10023805 Washer 5023 Mynute 24m...
  • Page 33 POS. DESCRIPTION Back insulating panel 2230 Lateral insulating panel 2231 Front insulating panel 2232 10020793 Connection 10021972 Fumes testing connection pipe 10021973 Pressure differential switch kit 01005272 Stop clip 10020626 Wiring harnes 10023838 Mynute 24m...

  • Page 34: Instructions

    10.5.2 SETTING THE MINIMUM BURNER PRESSURE Once the maximum burner pressure has been checked and/or adjusted, remove one of the grey wires from the modulating coil. Compare the read- Mynute 24m...
  • Page 35 Mynute 24m...
  • Page 36 Vokèra Ltd. Floor, Catherine House, Boundary Way, Hemel Hempstead, Herts, HP2 7RP Email: enquiries@vokera.co.uk Web: www.vokera.co.uk Sales, Technical Advice, General Enquiries - Tel: 0870 333 0520 Fax: 01442 281403 After Sales Service - Tel: 0870 333 0220 Vokèra Ireland...

Table of Contents