VOKERA Maxin 24e Installation & Servicing Instructions Manual
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VOKERA Maxin 24e Installation & Servicing Instructions Manual

VOKERA Maxin 24e Installation & Servicing Instructions Manual

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See also: Instructions for Using
24e & 28e
& Servicing
Instructions
British Gas Service Listed
G.C. No. 47 094 22 (24e)
G.C. No. 47 094 23 (28e)
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

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Summary of Contents for VOKERA Maxin 24e

  • Page 1 24e & 28e Installation & Servicing Instructions British Gas Service Listed G.C. No. 47 094 22 (24e) G.C. No. 47 094 23 (28e) THESE INSTRUCTIONS TO BE RETAINED BY USER...
  • Page 2 SECTION 1 INTRODUCTION These appliances are designed for use with The Vokèra MAXIN 24e & 28e are combined a sealed heating system only and are not central heating and domestic hot water intended for use on an open vented system.
  • Page 3 Differential pressure unit. Senses water flow rate through the pump & main heat exchanger and operates the flow switch.(23) Differential pressure unit. Senses domes- tic hot water flow which operates the 3 port valve and domestic microswitch. (13). MAXIN 24e & 28e...
  • Page 4 24e & 28e 14/14 metres max. (vertical) rating the appliance (N/G). plus the horizontal or vertical concentric terminal. 3.8.1 L.P.G. instructions are to be found on pages 57 & 58. The reduction in flue length for each bend used is listed opposite. MAXIN 24e & 28e...
  • Page 5 This unit is modified. The modification comprises a coil carried by the main burner regulation screw. For full flame a voltage of approx. 12.5v dc is applied to the coil. For central heating max. rate the max. voltage to the coil is restricted by an on site adjustment of a potentiometer. MAXIN 24e & 28e...
  • Page 6 In cold and/or humid weather water vapour an unusual location special procedures may may condense on leaving the flue terminal. be necessary and BS 6798:1987 gives The effect of such ‘steaming’ must be detailed guidance on this aspect. considered. MAXIN 24e & 28e...
  • Page 7 The following notes are intended for general guidance. The room sealed fan flued boiler does not require a permanent air vent for combustion air supply. Where installed in a cupboard or compart- ment ventilation is not required. MAXIN 24e & 28e...
  • Page 8 Pipe Shower Radiator Fig. 5a Hot Water Cold Water Outlets Inlet Gas Supply Pipe Boiler N.B. Vokèra Ltd recommend a 2-pipe system. Single pipe systems are more liable to be troublesome unless carefullly designed and installed. MAXIN 24e & 28e...
  • Page 9 If a shower control is to be supplied from the combination unit it should be of the type which incorporates a thermostatic control and by design is suitable for use with a combination boiler. Check application with shower manufac- turer. MAXIN 24e & 28e...
  • Page 10 Fig. 9 5.3.4 Loosely fit (hand tight) the valves and fittings using the washers supplied (Figs. 6a & 10). Fig. 10 D/H/W Cold Safety Outlet Water Valve Inlet Outlet Flow Return MAXIN 24e & 28e...
  • Page 11 (dimension ‘Y’). Using the complete vertical flue applications to be considered, telescopic flue assembly adjust the length to alternatively, the Vokera twin flue system can be suit dimension ‘Y’. Once the telescopic flue utilised if longer flue runs are required.
  • Page 12 (60mm) pipe is 7.5mm longer than outer (100mm) pipe (see fig. 13 & 13A). Remove any burrs, and check that any seals are located Fig. 13 properly. MAXIN 24e & 28e...
  • Page 13 5.5.3 Twin flue system & jig should now be drilled and plugged, an The Vokera twin flue system enables greater appropriate type and quantity of fixing should flue distances to be achieved (see 5.4.2) than be used to ensure that the bracket is mounted that of the standard concentric flue system.
  • Page 14 Horizontal termination ( fig. 17) The twin flue system must be converted to the dedicated concentric flue kit for termination. • The horizontal terminal is supplied with a built-in converter box and cannot be Fig. 15 shortened. MAXIN 24e & 28e...
  • Page 15 Push-fit the twin flue pipes onto the concentric to twin converter ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter. If necessary cut the plain ends (male) of the Fig. 18 MAXIN 24e & 28e...
  • Page 16 N.B. IT IS ESSENTIAL THAT ALL EXTER- NAL CONTROL CIRCUITS AND WIRING IS WIRED FROM THE SAME ELECTRICAL ISOLATOR AS SERVES THE APPLIANCE. Factory fitted internal wiring must not be disturbed when wiring external controls. Gas Cock Closed MAXIN 24e & 28e...
  • Page 17 Internal Controls Terminal Block Mains Input & External Controls Fig. 19A Terminal Block Control panel securing screws MAXIN 24e & 28e...
  • Page 18 The gas valve is de-energised, but leaves the fan and pump running. MAXIN 24e & 28e...
  • Page 19 24e (N/G) 1.5mbar (plus or minus 0.15mbar) 28e (N/G) 1.3mbar (plus or minus 0.13mbar) NOTE: Potentiometers located on main p.c.b. on front control panel. Access to p.c.b. is obtained by removing the four cover securing screws. MAXIN 24e & 28e...
  • Page 20 At the same time still operates when flow through the system the domestic micro-switch (13) is activated is limited. lighting the burner on maximum rate. MAXIN 24e & 28e...
  • Page 21 2.8 litres/min. (0.61 gal/min.). important document which must be correctly completed and handed to the user. Failure to install and commission this appliance to the manufacturers instructions may invalidate the warranty. Fig. 22a Fig. 23 MAXIN 24e & 28e...
  • Page 22 Advise the User that, for continued safe and efficient operation, the appliance must be serviced by a competent person at least once a year. MAXIN 24e & 28e...
  • Page 23 Clean heat exchanger using out by a competent person such as a suitable brushes and rods if necessary. Vokera approved service agent, British Gas 9. Inspect combustion chamber lining. The or other CORGI registered personnel. insulating material is easily damaged. Do not The following instructions apply to the boiler scrape, but clean off lightly.
  • Page 24 Fig. 25 NOTE: When refitting the Room sealed chamber front cover it is essential to cor- rectly seat and secure the cover in place ensuring all screws are tightened. Flue gas analysis test point Fig. 26 MAXIN 24e & 28e...
  • Page 25 Fig. 28 across the valve. Turn safety valve 1/4 turn to drain primary circuit of boiler. 8.8.7 Place cloth under heat exchanger to catch surplus water. MAXIN 24e & 28e...
  • Page 26 To remove side combustion chamber insulation boards. Gently prise upwards and pull out. 8.11.4 To remove rear board. Gently prise upwards and pull out. 8.11.5 Fourth panel (front) is replaced complete with combustion chamber front panel. MAXIN 24e & 28e...
  • Page 27 Spring Regulator Brass Sleeve Retaining Clip Retaining Ignition Locknut Clip Control Box Fig. 30 Minimum Rate Adjust- ing Screw Modulator Coil Modulator Coil Ignition Box Retaining Valve Screw GAS CONTROL VALVE COMPLETE WITH IGNITION CONTROL BOX MAXIN 24e & 28e...
  • Page 28 Release positive & negative pressure pipes tions. from manifold by removing 2 retaining clips and gently pull pipes clear of O' ring seal. Fig. 32 3 Port Valve & Flow Switch Assembly Pump Domestic Distribution Safety Manifold Valve Domestic Heat Exchanger MAXIN 24e & 28e...
  • Page 29 Drain the boiler. Fit a suitable pump and gauge (i.e. car foot pump and gauge) to the nipple at the top left-hand side of the expansion vessel, and pressurise from .75 - .80 bar (11 - 12psig) and remove the pump. MAXIN 24e & 28e...
  • Page 30 Replace in reverse order. D.H.E. Securing Screws Heating Return Pressure Pipes & Cold Water Inlet Manifold Fig. 33 Safety Valve 3 Port Valve & Flow Switch Manifold Retaining Clips Domestic Distribution Manifold Thermistor Sensor Domestic Bypass Heat Exchanger Tube MAXIN 24e & 28e...
  • Page 31 RETAINING CLIP Gauge Part No 8809 MODULATOR 8.22.1 Gain general access 8.4 COIL 8.22.2 Close heating flow and return valves (fig. 6a) by turning butterfly top 1/4 turn until head is 90° to the valve body. MAXIN 24e & 28e...
  • Page 32 1.6 mbar / 0.62 in w.g. NOTE: Potentiometers located on main p.c.b. on front control panel. Access to p.c.b. is obtained by plus or minus 0.16 mbar / 0.06 in w.g. removing the four cover securing screws. MAXIN 24e & 28e...
  • Page 33 MAXIN 24e & 28e...
  • Page 34 To ensure that internal/external controls (if fitted) do not interfere with fault finding, disconnect the wires from terminals 1 & 2 and 4 & 5 (labelling them in the process to ensure correct reconnection) and provide a solid link between 1 & 2 and 4 & 5. MAXIN 24e & 28e...
  • Page 35 MAXIN 24e & 28e...
  • Page 36 MAXIN 24e & 28e...
  • Page 37 MAXIN 24e & 28e...
  • Page 38 MAXIN 24e & 28e...
  • Page 39 MAXIN 24e & 28e...
  • Page 40 MAXIN 24e & 28e...
  • Page 41 MAXIN 24e & 28e...
  • Page 42 SECTION 10 APPENDIX Instructions for (A) Fitting Vokera 24 Hour Time Switch (Part No. 201) and Vokera Digital 7 Day Time Switch(Part No. 202) (B) Wiring to external Time Switches, Room Thermostats and Frost Thermostat. (C) Wiring for 'S' & 'Y' Plan Installations.
  • Page 43 LP111 or LP711 Do not link L & 1 Appliance Appliance Terminal Terminal Block Block Remove links (iii) Randall Time Switch and Vokera Room Thermostat. Earths have been ommitted for clarity Randall Time switches Typical Room Thermostat 103E 103E7 Do not link terminals 3 &...
  • Page 44 ORANGE GREY WHITE GREEN/YELLOW BLUE ADD THIS WIRE IF PROGRAMMER HAS A HEATING ONLY POSITION. DOUBLE CHANNEL PROGRAMMER NOTE: WHEN USING A 'Y' PLAN INSTALLATION THE MODE SELECTOR SWITCH WILL BE OVERRIDEN BY THE CONTROL CIRCUIT. MAXIN 24e & 28e...
  • Page 45 4174 Fig. 36C Fig. 36B Fig. 36H Fig. 36F Fig. 36G Fig. 36A 0828 Fig. 36D Fig. 36E & 36L Fig. 36I 0828 Fig. 36J...
  • Page 46 Fig. 36D Circulation Pump Fig. 36C Connecting Pipes 5323 Grundfos AO 5322 5323 5322 9758 9771 4254 5930 9757 4026 5023 5929 6025 8585 4026 9756 5023 6897 8367 5077 5154 5472 6897 8584 4931 5023 MAXIN 24e & 28e...
  • Page 47 8542 8540 5208 5119 5124 5209 5203 8533 8542 5026 8541 9271 5026 8536 7999 8537 5041 5026 8036 8484 8037 7999 Fig. 36F Valves 5070 9766 9764 9763 9797 5070 5071 4095 5070 5070 9763 MAXIN 24e & 28e...
  • Page 48 Fig. 36I Cover 5079 5180 5079 8084 7701 5905 5128 8084 7701 5080 5922 5083 8085 5904 5180 9754 8086 5080 5079 9755 5072 5094 3139 5128 5079 5079 7070 5079 5905 4007 5080 7281 5923 5927 MAXIN 24e & 28e...
  • Page 49 5075 5075 7915 5584 9274 8481 9753 5170 5169 7238 9752 5584 6466 9273 9759 5170 9760 3412 9779 9275 8809 5170 Fig. 36K Outer Casing 5580 5581 5093 5093 5333 8559 5128 5079 5128 5079 MAXIN 24e & 28e...
  • Page 50 Fig. 36L Hydraulic Sub-assembly 0870 0869 0866 0716 0867 0866 0113 0855 5041 5041 0709 0855 0856 0717 0714 0706 0863 0857 0706 0858 0217 0862 0852 0217 0851 0706 0875 0795 0874 0873 0704 MAXIN 24e & 28e...
  • Page 51 Combined Pressure & Temperature Gauge 6901 Modulator Coil Complete 8036 Domestic Heat Exchanger (24e) 8037 Domestic Heat Exchanger (28e) 9763 Heating Flow & Return Valves 8367 Safety Thermostat 4931 Fan Overrun thermostat 4250 Safety Valve 0828 D.H.W. & Flow Microswitch MAXIN 24e & 28e...
  • Page 52 T.V. Fan Overrun Thermostat P.F. Air Pressure Switch RMR C/H Minimum Heat Adjustment Screw Relay RLA Ignition Soft Light Adjustment Screw PTR C/H Temperature Control Pump PTS D/H/W Temperature Control T.L. High Limit Thermostat T.C. Time Clock MAXIN 24e & 28e...
  • Page 53 GENERAL LAYOUT & ILLUSTRATED WIRING DIAGRAM Fig. 38 MAXIN 24e & 28e...
  • Page 54 - if the fault also occurs at this stage then there is a house system fault which requires attention by the ELECTRICITY AUTHORITY. The customer should be warned not to use the appliance until this examination has been carried out. MAXIN 24e & 28e...
  • Page 55 The maximum heat input may be reduced 11.6.2 11.6.2 by a simple adjustment to suit the system load. This in no way affects the appliance maximum which is always obtained in the domestic hot water mode. MAXIN 24e & 28e...
  • Page 56 Fig. 39 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 Btu/h x 1000 MAXIN 24e & 28e...

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Maxin 28e

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