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VOKERA Maxin 24e, Installation & Servicing Instructions Manual

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VOKERA Maxin 24e Installation & Servicing Instructions Manual Download Page 52

51

MAXIN 24e & 28e

Key
F1

Fuse (2A F)

T.A. Room Thermostat
3V

Domestic Microswitch

M.S. Flow Microswitch
T.V.

Fan Overrun Thermostat

P.F.

Air Pressure Switch

RT

Relay

V

Fan

P

Pump

T.L.

High Limit Thermostat

E.R. Sensing Electrode
E.A. Spark Electrode
CVI

Combined Gas Valve & Ignition

MOD Modulator Coil
S1

NTC Sensor

R.R. Range Rating Adjustment Screw
RMR C/H Minimum Heat Adjustment Screw
RLA Ignition Soft Light Adjustment Screw
PTR C/H Temperature Control
PTS D/H/W Temperature Control
T.C. Time Clock

FUNCTIONAL FLOW DIAGRAM

Fig. 37

Summary of Contents for Maxin 24e

Page 1: ...Installation Servicing Instructions THESE INSTRUCTIONS TO BE RETAINED BY USER 24e 28e British Gas Service Listed G C No 47 094 22 24e G C No 47 094 23 28e...

Page 2: ...owered flue outlet with an annular co axial combus tion air intake which can be rotated through 360 degrees A vertical twin flue option is available and they are also suitable for S E duct installatio...

Page 3: ...mperature will continue to rise where upon the burner is switched off or the water temperature will fall and the burner will return to the maximum set pressure 2 3 Domestic Hot Water Mode 2 3 1 The ap...

Page 4: ...e 4 5 metres max horizontal 28e 3 4 metres max horizontal 24e 5 25 metres max vertical 28e 4 4 metres max vertical Twin 24e 28e 14 14 metres max horizontal 24e 28e 14 14 metres max vertical plus the h...

Page 5: ...For central heating max rate the max voltage to the coil is restricted by an on site adjustment of a potentiometer 3 9 Nominal hot water production 3 10 Central Heating Pump Duty Min Gas Rate Max Gas...

Page 6: ...aspect Pipework from the meter to the boiler must be of adequate size Pipes of a smaller size than the boiler inlet connection should not be used The complete installation must be tested for soundness...

Page 7: ...ed to ensure that with only one radiator turned on a flow rate of at least 350 litres hour 1 28 gals min is achieved through the boiler see 6 9 4 4 6 4 SystemDesign Figs 5 5a illustrates typical syste...

Page 8: ...Single pipe systems are more liable to be troublesome unless carefullly designed and installed Fig 5a Shower Boiler Hot Water Outlets Radiator Fig 5 Gas Supply Pipe Cold Water Inlet Radiator Shower C...

Page 9: ...referred methods An alternative method would be from an inde pendent make up vessel or tank mounted in a position 1m higher than the highest point of the system with a minimum static head from the top...

Page 10: ...ng kit contains 1 Hanging bracket 1 Fittings pack containing Central heating valves tap connectors 2 Gas service tap 1 Cold water stopcock 1 Hot water outlet 1 nut tail Various washers Flue Kit suppli...

Page 11: ...14m terminal terminal Horizontal flue terminals and accessories Part No Description Min Max Length 0225705 Standard telescopic flue 380mm 600mm Dimension X 0225710 Extended telescopic flue 600mm 920m...

Page 12: ...pipe by 7 5mm see fig 13A Ensure any burrs are filed or removed and that any seals are located properly before assembly Connect the inner 60mm pipe of the terminal assembly to the push fit end of the...

Page 13: ...1 0 metre Part No Description Length 2359039 Vertical flue terminal 1 0 metre 0225770 Pitched roof flashing N A plate 0225765 Flat roof flashing plate N A 2359069 750mm extension 750mm 2359079 1500mm...

Page 14: ...Fig 15 Remove or discard the flue restrictor ring from the appliance flue outlet see fig 1 Insert the small restrictor ring supplied with the twin adapter kit if the total flue length including the al...

Page 15: ...exhaust pipe connects to the exhaust connection on the concentric to twin converter If necessary cut the plain ends male of the Fig 17 A 130mm hole is required for the passage of the concentric termin...

Page 16: ...pe does not restrict access to or operation of the central heating return valve The discharge should terminate facing down wards exterior to the building in a position where discharging possible boili...

Page 17: ...he cable 5 7 7 External controls may be wired from termi nals 1 to 2 on the left hand terminal block mounted on the back of the front fascia panel after removing the factory fitted links see fig 19A I...

Page 18: ...system pressure to the required value turn the red knob of the safety valve 11 a quarter turn to release water until the required figure registers on the gauge 19 6 3 5 Filling the Hot Water System 6...

Page 19: ...boiler output will reduce to the minimum setting If low flame cannot be established in this way turn off the electricity supply release the modulator coil retaining clip and slide the modulator coil o...

Page 20: ...st radiator return valves and any branch circuit return valves until the individual return temperatures are correct and are approximately equal 6 9 4 When all is adjusted progressively close all radia...

Page 21: ...rtant 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 6 11 4 If the bur...

Page 22: ...r 7 3 Inform the user of the location of all drain cocks and air vents 7 4 Explain how to turn the appliance off for both short and long periods and advise on the precautions necessary to prevent dama...

Page 23: ...alve Observe pressure gauge reading fig 1 19 which should be approximately 1 bar when the system is cold see 6 3 4 5 Turn off mains electricity and turn off gas service tap on the appliance 6 Gain gen...

Page 24: ...ntling unless otherwise stated Electrical connections must be remade in accordance with the wiring diagram figs 37 38 8 4 3 Wherever gas control components are replaced check the burner pressures and...

Page 25: ...ain Burner Injectors 8 7 1 Gain general access as 8 4 8 7 2 Remove room sealed front cover plate and combustion chamber front 8 5 8 6 3 8 7 3 Remove main burner 8 6 4 to 8 6 8 8 7 4 Unscrew injector s...

Page 26: ...hood screw first 8 10 Flue Pressure Differential Switch Part No 7070 Refer to Fig 29 8 10 1 Gain general access as 8 4 8 10 2 Remove room sealed cover 8 5 8 10 3 Remove 2 screws holding pressure diffe...

Page 27: ...ns 8 13 Gas Control Valve complete Part No 8277 8 13 1 Turn off gas service tap 8 13 2 Remove modulator coil as 8 12 ignition control box as 8 12 7 8 13 3 Remove modulator coil brass sleeve by releasi...

Page 28: ...essure pipes from manifold by removing 2 retaining clips and gently pull pipes clear of O ring seal 8 15 6 Loosen 2 retaining grub screws securing manifold to 3 port valve and withdraw manifold See fi...

Page 29: ...ere it connects onto the manifold 8 18 9 Remove retaining screw between heating return valve cold water stopcock securing manifold to frame 8 18 10 Withdraw manifold from appliance 8 18 11 Reassemble...

Page 30: ...8 20 6 Replace in reverse order 8 21 Removal of Electrical Components 8 21 1 Ensure electricity is switched off at main isolator and gain general access as 8 4 8 21 2 Flow Microswitch Fig 1 no 23 8 2...

Page 31: ...lip 8 21 23 Reassemble in reverse order ensuring correct location of electrical connections see fig 38 for electrical connections 8 21 24 Thermistor Sensor Part No 8484 Refer to fig 33 8 21 25 Gain ge...

Page 32: ...in w g 28e N G 1 6 mbar 0 62 in w g plus or minus 0 16 mbar 0 06 in w g If the reading is incorrect it should be adjusted as follows With the boiler still in central heating mode and the burner at the...

Page 33: ...ncrease the voltage to the modulator coil and therfore increase the gas rate SECTION 9 OPERATIONAL CHECKS AND WIRING DIAGRAMS 9 1 On completion of any service fault finding task which has required the...

Page 34: ...n in the heating circuit reducing the flow rate to below 350 l hour 1 28 gpm the flow switch will deacti vate and de energise the gas valve FAULT FINDING GUIDES On the following pages are the fault fi...

Page 35: ...ON PCB MAINS ON PUMP CONNECTOR M1 22 M1 23 CHECK WIRING AND CONNECTIONS BETWEEN TERMINAL BLOCK AND CIRCUIT BOARD CHECK WIRING AND CONNECTIONS OR HOT WATER FLOW SWITCH REPLACE PCB REPLACE CIRCUIT BOARD...

Page 36: ...ON TAP SWITCH ON BOILER AND SELECT MODE TO SUMMER DHW THERMOSTAT AT MIIN START YES NO YES REPLACE CIRCUIT BOARD CHECK DHW FLOW SWITCH AND WIRING NO IS 240V AC PRESENT BETWEEN TERMINAL M3 7 NEUTRAL ON...

Page 37: ...BOARD REPLACE MODULATOR COIL ARE WIRING AND CONNECTIONS BETWEEN MODUL COIL AND PCB OK IS THE RESISTENCE OF MODULATOR COIL APPROX 40 OHM WAIT UNTIL THE BURNER SWITCHES OFF DOES BURNER LIGHT ENSURE ROO...

Page 38: ...ECTIONS BETWEEN TERMINAL BLOCK AND CIRCUIT BOARD REPLACE CIRCUITBOARD REPLACE FUSE FUSE OK CHECK FUSE ON CIRCUIT BOARD RECHECK SUPPLY FUSE CONNECTORS TO BOILER TERMINALS IS 240V AC PRESENT BETWEEN LIV...

Page 39: ...ITION SPARK AT ELECTRODE A IS THERE 240 Vac BETWEEN TERMINALS 11 10 ON CVI CONNECTOR CHECK WIRING AND CONNECTIONS YES YES YES NO IS THERE 240 Vac BETWEEN TERMINALS M5 19 M4 25 ON PCB CHECK WIRING AND...

Page 40: ...RD DOES FUN RUNNING NO YES REPLACE CONTROL BOARD DOES BURNER LIGHT C NO YES REPLACE CONTROL BOARD REPLACE DHW FLOW SWITCH IS DHW FLOW SWITCH OK END DO BURNER AND PUMP SWITCH OFF TURN OFF TAP IS FLUE T...

Page 41: ...IT BOARD REMOVE JUMPER IS TIMER JUMPER OFF SWITCH TA OFF DOES BURNER LIGHT WAIT 3 MIIN DOES BURNER LIGHT REPLACE CIRCUIT BOARD DOES FUN RUNNING NO YES REPLACE CIRCUIT BOARD REPLACE ROOM TERM SWITCH IS...

Page 42: ...erminals 4 5 ROOM THERMOSTAT Remove the loop between terminals 1 2 and connect room thermostat as fig 5 or 5a FROST THERMOSTAT Connect to terminals 2 3 If a neutral is required use terminal marked N t...

Page 43: ...bring appliance on in heating mode if space temperature falls below that set on frost stat Mode selector must be set at either or Room Thermostat Frost Thermostat Remove Links Earths have been ommitte...

Page 44: ...s ROOM THERMOSTAT APPLIANCE TERMINAL BLOCK LOAD LIVE E L N MainsSupply 230v50Hz 3 Amp Fuse 3 Amp Fuse N L 1 3 2 N L E 1 2 3 4 5 6 7 CYLINDER THERMOSTAT SATISFIED CALLING COMMON ORANGE GREY WHITE GREEN...

Page 45: ...44 MAXIN 24e 28e EXPLODED DIAGRAMS Fig 36 Fig 36B Fig 36E 36L Fig 36F Fig 36I Fig 36A Fig 36G Fig 36H Fig 36C Fig 36J 0828 Fig 36D 0828 4174...

Page 46: ...5079 8277 N G L P G 28e 5317 5319 24e 5295 5297 4254 9771 6897 6025 9266 5180 9265 5371 8530 5128 5079 5079 5079 8528 5371 8529 5154 8478 8097 8094 0394 5869 N G L P G 8360 8361 6901 5176 5105 8974 92...

Page 47: ...c Assembly Fig 36F Valves 7999 5124 5209 5203 9268 4250 9271 5026 5026 8533 5209 5119 8540 8537 24e 8036 28e 8037 7999 8536 5026 5041 8541 8484 5203 5124 5208 8538 8539 8542 5070 9763 4095 5071 5070 9...

Page 48: ...8083 5916 5128 5079 5079 5271 5128 5079 5093 5080 5079 5279 5079 5165 5081 5271 5079 28e 5907 24e 5906 5912 5079 5128 4807 5080 8084 5922 5079 5079 5927 Fig 36G Combustion Chamber Fig 36H Sealed Case...

Page 49: ...24e 28e 5170 5584 9752 5075 Fig 36J Front Panel Fig 36K Outer Casing 9274 8481 5169 9273 5170 3412 9275 8809 9759 6466 7238 5170 9753 5075 7915 5584 5333 8559 5581 5093 5079 5128 5079 5128 5093 5580 9...

Page 50: ...9 MAXIN 24e 28e Fig 36L Hydraulic Sub assembly 0870 0869 0716 0866 0867 0113 5041 0709 0717 0714 0863 0706 0217 0862 0217 0706 0851 0852 0858 0857 0706 0856 5041 0855 0795 0704 0874 0875 0855 0873 086...

Page 51: ...stic Diapragm 7070 36H Pressure Differential Switch 5298 36A Main Burner 24e 5317 36A Main Burner 28e 8360 36A Ignition Control Box 9797 36F Gas Service Cock 9764 36F Cold Water Inlet Service Cock Adj...

Page 52: ...Fan P Pump T L High Limit Thermostat E R Sensing Electrode E A Spark Electrode CVI Combined Gas Valve Ignition MOD Modulator Coil S1 NTC Sensor R R Range Rating Adjustment Screw RMR C H Minimum Heat A...

Page 53: ...52 MAXIN 24e 28e GENERAL LAYOUT ILLUSTRATED WIRING DIAGRAM Fig 38...

Page 54: ...CHECK Appliance connected to mains supply and meter set on 300V ac scale Test at appliance terminal strip a Test leads from L to N meter reads approx 230V ac b Test leads from L to E meter reads appr...

Page 55: ...iance 11 6 2 11 6 2 11 6 2 11 6 2 11 6 2 The maximum heat input may be reduced by a simple adjustment to suit the system load This in no way affects the appliance maximum which is always obtained in t...

Page 56: ...Range Rating Heating Range Rating Heating Range Rating Heating Range Rating Refer to fig 39 to determine the pressure for the heating output required Turn on the heating with the control knob set at...

Page 57: ...Cod 10022256 19 01 Ed 1...

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