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14

EXTENDING THE FLUE

Connect the bend – supplied with the terminal kit – to the top 
of the boiler using clamp (supplied) see fi g. 10. The additional 
bends & extensions have push-fi t connections, care should be 
taken to ensure that the correct seal is made when assembling 
the fl ue system. Connect the required number of fl ue  exten-
sions or bends (up to the maximum equivalent fl ue length) to 
the fl ue terminal  (see fi g. 10-12).

 

The fl ue system should have 

a minimum of 1º; maximum of 3º rise from the boiler to outside, 
to ensure any condense fl uid that forms, is allowed to drain 
back to the appliance.

NOTE

When cutting an extension to the required length, you must 
ensure that the excess is cut from the plain end of the exten-
sion. Remove any burrs, and check that all seals are located 
properly. You must ensure that the entire fl ue system is properly 
supported and connected. Seal the fl ue assembly to the wall us-
ing cement or a suitable alternative that will provide satisfactory 
weatherproofi ng. The interior and exterior trim can now be fi tted.

Fig. 12

4.5.1.2 FITTING THE REAR FLUE (

fi

 g. 13) (rear 

fl

 ue outlet

only)

Using the template provided, mark and drill a 125mm hole 
for the passage of the fl ue pipe, see fi g 9. The hole should 
be drilled LEVEL to ensure any condense fl uid that forms, is 
allowed to drain back to the appliance. The fi xing holes for 
the wall mounting bracket should now be drilled and plugged, 
an appropriate type and quantity of fi xing should be used to 
ensure that the bracket is mounted securely. Once the bra-
cket has been secured to the wall, remove the blanking plate 
from the rear of the boiler (Fig. 15). 
NOTE The inner 60mm pipe of the rear fl ue terminal mu

st be 

cut by 12mm at the point indicated (

fi

 g.13 pos. A).

Fig.13

Fig.15

Using the screws and washers provided, secure the appliance 
onto the wall bracket and tighten with a suitable spanner.
Seal the fl ue assembly to the wall using cement or a suitable 
alternative that will provide satisfactory weatherproofi ng. The 
exterior wall trim can now be fi tted.

Fig.14

Fig. 11

Part No. 

Description  

Length

 

 29450133  Rear fl ue terminal 

825mm 

Attach the rear fl ue terminal to the appliance (using the pre-
viously retained screws) and fi x the telescopic terminal to the 
correct length (wall thickness) ensuring that the terminal will 
protrude through the wall by the correct distance. At this point, 
lift the appliance and carefully insert the terminal into and 
through the wall, ensuring that the holes in the appliance back 
frame are aligned with the studs on the wall bracket.
Seal the top fl ue outlet of the boiler with the blanking plate 
provided with the rear fl ue kit (Fig. 14).

218

Summary of Contents for Mynute i20

Page 1: ...is a licensed member of the Benchmark scheme which aims to improve the standards of installation and which aims to improve the standards of installation and commissioning of domestic hot water system...

Page 2: ...Mounting on a combustible surface 12 3A 9 Timber framed buildings 12 3A 10 Inhibitors 12 3A 11 Declaration of conformity 12 Installation Page 4 1 Delivery 13 4 2 Contents 13 4 3 Unpacking 13 4 4 Prep...

Page 3: ...tomatically Dear Customer Your Vok ra Mynute i boiler has been designed to meet and exceed the very latest standards in gas central heating technology and if cared for will give years of reliable use...

Page 4: ...unter clockwise to reduce the tem perature range 40 C 80 C for standard central heating The automatic temperature control function SARA is set within the blank bullet points MODE SELECTOR SWITCH HEATI...

Page 5: ...ance status table for fault indicator and boiler status 2 3 LIGHTING THE BOILER Ensure the gas and electrical supply to the boiler are turned on Turn the mode selector switch to the ON position When t...

Page 6: ...THE SYSTEM FOR LONG PERIODS If the house is to be left unoccupied for any length of time especially during the winter the system should be thoroughly drained of all water The gas water and electricit...

Page 7: ...rary then final Reset check appliance operation Temperature differential Final Reset check appliance operation check thermistors A08 Return thermistor fault Temporary Check return thermistor check wir...

Page 8: ...ons These appliances are designed for use with a sealed system only consequently they are not intended for use on open vented systems This booklet is an integral part of the appliance It is therefore...

Page 9: ...nissensedbytheelectroniccircuittoensureflamestability at the burner Once successful ignition has been achieved the electronic circuitry increases the gas rate to 75 for a period of 15minutes Thereafte...

Page 10: ...e i30 Sides 12mm Top 150mm from casing or 25mm above flue elbow whichever is applicable Bottom 150mm Front 600mm 2 7 Connections Mynute i20 Mynute i30 Flow return 22mm Gas 15mm Safety valve 15mm Conde...

Page 11: ...300 mm Q From the top of the vertical terminal to the roof flashing As determined by the fixed collar of the vertical terminal R To the side of a boundary 300 mm S To the side of an opening or window...

Page 12: ...high water content it may be necessary to provide additional expansion capacity see 6 18 3 6 6 FILLING POINT A method for initial filling of the system and replacing water lost during servicing etc di...

Page 13: ...s no requirement for a sheet of fireproof material to protect the wall 3 9 TIMBER FRAMED BUILDINGS If the appliance is to be fitted in a timber framed building it shouldbefittedinaccordancewiththeInst...

Page 14: ...es with the local water authority regulations 3A 6 7 LOW PRESSURE SEALED SYSTEM An alternative method of filling the system would be from an independent make up vessel or tank mounted in a position at...

Page 15: ...on its vertical axis In addition the flue may be extended from the outlet elbow in the horizontal plane see2 9 Areductionmustalsobemadetothemaximumlength see table below when additional bends are use...

Page 16: ...d be drilled LEVEL to ensure any condense fluid that forms is allowed to drain back to the appliance The fixing holes for the wall mounting bracket should now be drilled and plugged an appropriate typ...

Page 17: ...ect the required number of flue extensions or bends up to the maximum equivalent flue length between the boiler and vertical flue assembly Ensure that any horizontal sections of the flue system have a...

Page 18: ...flue kit for termination The horizontal terminal is supplied with a built in converter box and cannot be shortened A 130mm hole is required for the passage of the concentric terminal through the wall...

Page 19: ...reen yellow to EARTH connection Insertthesupplied3 AMPfuseintothefusedisolatororfusedplug Should the fly lead be unsuitable refer to 4 7 3 for details on how to connect the electrical supply directly...

Page 20: ...UK to ensure that correct combustion is occurring see flow chart on page 36 Additionally if the gas valve has been adjusted replaced or the appliance has been converted for use with another gas type...

Page 21: ...SERVICING Check the operation of the appliance and ensure it functions as described in section 7 Compare the performance of the appliance with its design specification The cause of any noticeable dete...

Page 22: ...and remove the air chamber front cover Remove the AAV locking pin M from the deaerator assembly and remove the AAV assembly N Replace in the reverse order 6 8 WATER PRESSURE SWITCH fig 29 Carry out co...

Page 23: ...electrode leads and ancillary wiring from their respective connectors Remove the retaining screws W for electrode and remove 6 12 GAS VALVE fig 31 Carry out component removal procedure as described in...

Page 24: ...cal an external expansion vessel may be fitted to the return pipe as close to the appliance as possible 6 18 1 EXPANSION VESSELREMOVAL with sufficient clearance above fig 37 Carry out component remova...

Page 25: ...Locate and remove the screw A2 that secures the flue gas analysis test point cover B2 Remove the clip and the fumes thermostat C2 Locate and remove the screws D2 that se cure the flue collector to th...

Page 26: ...sition and any additional controls time clock programmer room thermostat etc calling for heat the appliance will operate in the heating mode The pump and fan will be activated via the flow temperature...

Page 27: ...PLETION On completion of the combustion analysis check and or any gas valve adjustment refit the plug fig 40 L2 and move the mode selector through position Remove the test probe from the test point an...

Page 28: ...at the fuse has failed but no fault is in dicated a detailed continuity check will be required to trace the fault A visual inspection of components may also assist in locating the fault 7 7 3 POLARITY...

Page 29: ...pm GAS VALVE CALIBRATION Connect the boiler to the power supply Open the gas tap Set the function selector to OFF RESET monitor off Remove the screws E remove the casing remove the re taining screw be...

Page 30: ...0 15 20 25 30 ROOM TEMPERATURE CURVE OFFSET DELIVERY TEMPERATURE C EXTERNAL TEMPERATURE C Fig 42 The boiler is supplied with the adjustments shown in the table Depending on plant engineering requireme...

Page 31: ...FLOW OUTLET TEMPERATURE C T80 Maximum set point for standard T range JP7 removed T45 Maximum set point for low T range JP7 inserted Fig 43 CN8 CN7 CN6 CN5 CN12 1 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 CN15...

Page 32: ...appliance can be used with the following controls twin channel programmers The appliance can be used in conjunction with typical S Plan systems and Y Plan systems Please contact Vokera technical shou...

Page 33: ...CN2 NO NC C black black BE11 FUNCTIONAL DIAGRAM Fig 45 S W CO2 function button F S 1 Flame sensor F1 Fuse 3 15A T F External fuse 3 15A F M3 Terminal strip for electrical connection hight power P Pum...

Page 34: ...10 0 CO2 minimum output 10 0 10 0 CO maximum output ppm 190 160 CO minimum output ppm 20 15 CO2 FUNCTIONS ACTION ON THE BUTTON DISPLAY combustion analysis mode press once burner running at maximum hea...

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Page 36: ...OHU LQWHUORFN 3URYLGHG ALL SYSTEMS 7KH V VWHP KDV EHHQ XVKHG DQG FOHDQHG LQ DFFRUGDQFH ZLWK 6 DQG ERLOHU PDQXIDFWXUHU V LQVWUXFWLRQV Yes KDW V VWHP FOHDQHU ZDV XVHG KDW LQKLELWRU ZDV XVHG 4XDQWLW OLWU...

Page 37: ...HSKRQH 1R DV VDIH UHJLVWHU 1R 5HFRUG W PD UDWH 2 SSP AND 2 W PLQ UDWH KHUH 3RVVLEOH 2 SSP AND 2 RPPHQWV 6LJQDWXUH SERVICE 04 DWH QJLQHHU QDPH RPSDQ QDPH 7HOHSKRQH 1R DV VDIH UHJLVWHU 1R 5HFRUG W PD UD...

Page 38: ...R TO MINIMUM RATE In accordance with section 7 3 set boiler to operate at minimum rate to minimum load condition Allow sufficient time for combustion to stabilise YES Is CO 350ppm and CO CO2 ratio les...

Page 39: ...39...

Page 40: ...ies vokera co uk www vokera co uk www vokera ie Sales General Enquires T 0844 391 0999 F 0844 391 0998 Vok ra Ireland West Court Callan Co Kilkenny T 056 7755057 F 056 7755060 Vok ra Limited reserve t...

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