VOKERA Linea Release note

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Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Linea

Supplied By www.heating spares.co Tel. [phone]
Contents
Design principles and operating sequence Page
1.1 Principlecomponents 2
1.2 Mode of operation (at reset) 2
1.3 Mode of operation (Heating) 2
1.4 Mode of operation (DHW) 2
1.5 Safety devices 2
1.6 Optionalaccessories 2
Technical data Page
2.1 Centralheating 3
2.2 Domestic hot water 3
2.3 Gas pressure 3
2.4 Expansion vessel 3
2.5 Dimensions 3
2.6 Clearances 3
2.7 Connections 3
2.8 Electrical 3
2.9 Flue details (concentric) 3
2.9A Flue details (twin pipes) 3
2.10 Efficiency 3
2.11 Pump duty 4
2.12 Emissions 4
General requirements (UK) Page
3.1 Relateddocuments 5
3.2 Location of appliance 5
3.3 Gas supply 5
3.4 Flue system 5
3.5 Air supply 5
3.6 Watercirculation 5
3.6.1 Pipework 6
3.6.2 Automatic by-pass 6
3.6.3 Drain cocks 6
3.6.4 Air release points 6
3.6.5 Expansion vessel 6
3.6.6 Filling point 6
3.6.7 Low pressure sealed system 6
3.6.8 Frequentfilling 6
3.7 Electrical supply 6
3.8 Showers 6
3.9 Mounting on a combustible surface 6
3.10 Timber framed building 7
3.11 Inhibitors 7
General requirements (EIRE) Page
3.A1 Relateddocuments 7
3.A2 Location of appliance 7
3.A3 Gas supply 7
3.A4 Flue system 8
3.A5 Air supply 8
3.A6 Water circulation 8
3.A6.1 Pipework 8
3.A6.2 Automatic by-pass 8
3.A6.3 Drain cocks 8
3.A6.4 Air release points 8
3.A6.5 Expansion vessel 8
3.A6.6 Filling point 8
3.A6.7 Low pressure sealed system 8
3.A6.8 Frequentfilling 8
3.A7 Electrical supply 8
3.A8 Showers 8
3.A9 Mounting on a combustible surface 9
3.A10 Timber framed building 9
3.A11 Inhibitors 9
3.A12 Declaration of conformity 9
Installation Page
4.1 Delivery 9
4.2 Contents 9
4.3 Unpacking 9
4.4 Preparation for mounting the appliance 9
4.5 Fitting the flue 9
4.5.1 Concentric horizontal flue 9
4.5.2 Concentric vertical flue 11
4.5.3 Twin flue system 12
4.6 Connecting the gas and water 14
4.6.1 Gas 14
4.6.2 Flow and return 14
4.6.3 Cold water inlet 14
4.6.4 Hot water outlet 15
4.6.5 Safety valve 15
4.7 Electricalconnections 15
4.7.1 Casing removal 15
4.7.2 Appliance terminal block 15
4.7.3 Connecting the mains (230V) input 15
4.7.4 Connecting the Vokera time clock 16
Commissioning Page
5.1 Gas supply installation 17
5.2 The heating system 17
5.3 Initial filling of the system 17
5.4 Initialflushing 17
5.5 Filling the hot water system 17
5.6 Pre-operationchecks 17
5.7 Initiallighting 17
5.7.1 Checking burner pressures 17
5.8 Final flushing of the heating system 18
5.8.1 Inhibtors 18
5.9 Setting the boiler operating temperature 18
5.9.1 Setting the domestic hot water temperature 18
5.10 Setting the system design pressure 18
5.11 Regulating the hot water 18
5.11.1 Changing the flow restrictor 18
5.11.2 Regulating the central heating system 18
5.12 Final checks 19
5.13 Instructing the user 19
Servicing instructions Page
6.1 General 19
6.2 Routine annual servicing 19
6.4 Componentremoval procedure 20
6.5 Pump assembly 20
6.6 Safety valve 20
6.7 Automatic air release valve 20
6.8 Water pressure switch 20
6.9 Pressuregauge 21
6.10 Primary thermistors 21
6.11 High limit thermostat 21
6.12 Printed circuit board 21
6.13 Gas valve 22
6.14 Integral time switch 22
6.15 Electrode, burner thermostat, burner & injectors 22
6.16 Flue fan 22
6.17 Main heat exchanger 24
6.18 Air pressure switch 24
6.19 Flow restrictor 24
6.20 DHW flow switch 25
6.21 DHW heat exchanger 25
6.22 Valve actuator 25
6.23 Divertor valve assembly 25
6.24 Secondarythermistor 25
6.25 Automatic by-pass 26
6.26 DHW non-return valve 26
6.27 Expansion vessel 26
6.27.1 Expansion vessel removal 26
6.27.2 Expansion vessel removal 26
Checks, adjustments and fault finding page
7.1 Checkingappliance operation 27
7.2 Appliance mode of operation 27
7.2.1 Selector switch in the off position 27
7.2.2 Selector switch in the hot water only position 27
7.2.3 Selector switch in the heating & hot water position 27
7.2.4 Appliancefunctions 27
7.2.5 Heating mode 27
7.2.6 DHW mode 28
7.3 Checking and adjusting burner pressure 28
7.3.1 Setting the maximum burner pressure 28
7.3.2 Setting the minimum burner pressure 28
7.4 Combustion analysis test 29
7.5 Checking the expansion vessel 29
7.6 External faults 29
7.6.1 Installationfaults 29
7.7 Electrical checks 29
7.7.1 Earth continuity test 29
7.7.2 Short circuit test 29
7.7.3 Polarity check 29
7.7.4 Reversed polarity or supply fault 30
7.7.5 Resistance to earth check 30
7.8 Fault finding 30
7.8 Fault codes 31-38
Wiring diagrams Page
8.1 External wiring 39
8.2 Typical control applications 39
8.3 Vokera time clock 39
8.4 Vokera remote control 39
8.5 Vokera room thermostat 39
8.6 Othercontrols 39
Exploded diagrams Page
Table 1 43
Table 2 44
Table 3 45
Table 4 46
Table 5 47
L.P.G.instructions Page
10.1 Relateddocuments 48
10.3 Converting the appliance gas type 48
10.4 Gas supply 48
10.5 Gas supply installation 48
10.6 Checking and adjusting burner pressure 48
10.6.1 Setting the maximum burner pressure 48
10.6.2 Setting the minimum burner pressure 48

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Linea
The Linea 7 range is comprised of 3 models of combina-
tion boiler – 726, 730, 735 – with outputs to heating &
DHW of 26, 30 & 35 kW respectively. Each appliance –
by design – incorporates electronic ignition, circulating
pump, expansion vessel, safety valve, pressure gauge,
and automatic by-pass.
The Linea 7 range are produced as room sealed, cat-
egoryII2H3+appliances,suitableforinternalwallmount-
ing applications only. They are provided with a fan pow-
ered flue outlet with an annular co-axial combustion air
12
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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24
INTRODUCTION
intake that can be rotated – horizontally – through 360
degreesforvarioushorizontalorverticalapplications. The
Linea 7 range can also be used with theVokera twin flue
system.
The Linea 7 range is approved for use with C12, C22, &
C32 type flue applications.
These appliances are designed for use with a sealed
system only; consequently they are not intended for use
on open vented systems.
Fig. 1
25 26 28 29
32 31
27
30
Fig.1 General Layout
1 Flue Outlet
2 Air Intake
3 Differential analog Pressure Switch
4 Silicone Pressure Tube
5 Silicone Negative Pressure Tube
6 Expansion Vessel
7 Main Heat Exchanger
8 Electrode
9 Burner Temperature control
10 Transformer
11 Gas Valve
12 Modulator Coil
13 Domestic Heat Exchanger
14 Domestic Hot Water Flow Switch
15 Safety Valve
16 Pressure Switch
17 Diverter Valve Motor
18 Pump
19 Automatic Air Release Valve
20 Main Burner
21 Combustion Chamber
22 Fan Assembly
23 Air Chamber (with front removed)
24 Flue Gas Analysis Test Point
25 Hot Water Temperature Control
26 Mode Selector Switch
27 Status LED
28 Temperature Indicator
29 Central HeatingTemperature Control
30 Combustion Switch
31 Timeclock Aperture(optional)
32 Pressure Gauge

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1.1 PRINCIPLE COMPONENTS
●●
●●
●A fully integrated electronic control board fea-
turing electronic temperature control, anti-cy-
clecontrol,pumpover-run,self-diagnosticfault
indicator, full air/gas modulation.
●●
●●
●Low-water-content, copper heat exchanger.
●●
●●
●Electronic ignition with flame supervision
●●
●●
●Integral high-head pump
●●
●●
●Fan
●●
●●
●Expansion vessel
●●
●●
●Analogue pressure switch (PAD)
●●
●●
●Water pressure switch
●●
●●
●Two-stage gas valve
●●
●●
●Pressure gauge
●●
●●
●Safety valve
●●
●●
●Burner Temperature control
1.2 MODE OF OPERATION (at rest)
When the appliance is at rest and there are no
requests for heating or DHW, the following func-
tions are active:
●●
●●
●Pre-heat function – the pre-heat function ena-
blesthe appliancetoperiodically lightandmain-
tain the temperature of the DHW heat ex-
changer. This “keep-hot” facility enables the
appliancetoprovidean instantaneousresponse
to DHW requests.
●●
●●
●2-stagefrost-protectionsystem – the frost-pro-
tection system protects the appliance against
the risk of frost damage. The first stage ena-
blesactivation of the pumpshouldthetempera-
ture of the appliance fall to 7oC. The second
stage becomes active when the temperature
has dropped to 3oC. Should the second stage
become active, the appliance will function on
minimum power until it reaches 30oC.
●●
●●
●Anti-blockfunction–theanti-blockfunctionena-
bles the pump and divertor valve actuator, to
beenergised for short periods, whenthe appli-
ancehasbeen inactive for more than 19-hours.
1.3 MODE OF OPERATION (Heating)
Whenthereisarequestforheatviatheprogram-
mer/time clock and/or any external control, the
pump and fan are started, the fan speed will
modulate until the correct signal voltage is re-
ceived at the control PCB. At this point an igni-
tion sequence is enabled.
Ignitionissensedbytheelectroniccircuitrytoen-
sure flame stability at the burner.Once success-
ful ignition has been achieved, the electronic cir-
cuitry increases the gas rate to 75% for a period
of 15 minutes.Thereafter, the boiler’s output will
either be increase to maximum or modulate to
suit the set requirement.
Whentheappliancereaches thedesiredtempera-
ture the burner will shut down and the boiler will
perform a three-minute anti-cycle (timer delay).
Whenthe request for heat hasbeen satisfied the
appliance pump and fan may continue to oper-
ate to dissipate any residual heat within the ap-
pliance.
1.4 MODE OF OPERATION (DHW)
When there is a request for DHW via a hot water
outlet or tap, the pump and fan are started, the
fan speed will modulate until the correct signal
voltageisreceivedatthecontrol PCB.Atthispoint
an ignition sequence is enabled.
Ignition is sensed by the electronic circuitry to
SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE
ensure flame stability at the burner. Once suc-
cessfulignitionhasbeen achieved, the electronic
circuitry increases the gas rate to maximum or
willmodulateoutput to stabilise the temperature.
In the event of the appliance exceeding the de-
sired temperature the burner will shut down until
the temperature drops.
When the request for DHW has been satisfied
the appliance pump and fan may continue to op-
eratetodissipateanyresidualheat within the ap-
pliance.
1.5 SAFETY DEVICES
When the appliance is in use, safe operation is
ensured by:
●●
●●
●A water pressure switch that monitors system
water pressure and will de-activate the pump,
fan, and burner should the system water pres-
sure drop below the rated tolerance.
●●
●●
●A high limit thermostat that over-rides the tem-
perature control circuit to prevent or interrupt
the operation of the burner.
●●
●●
●Ananalogue pressure switch(PAD)that checks
the operation of the fan and flue thereby allow-
ing safe operation of the burner.
●●
●●
●Asafetyvalvewhich releases excess pressure
from the primary circuit.
●●
●●
●Burner Temperature control
1.6 OPTIONAL ACCESSORIES
The Linea 7 is suitable for use with a range of
optional accessories that enable enhanced op-
eration and/or applications. These include:
●●
●●
●RC05 remote control – the RC05 remote con-
trol enables the appliance to be controlled, ad-
justed, and monitored from another location or
room. The RC05 can also be used as a room
thermostatorprogrammable room thermostat.
●●
●●
●External sensor – used in conjunction with the
RC05 the external sensor enables the appli-
ancetoautomatically adjust its outlet flowtem-
perature in response to the outside tempera-
ture.
Air Intake
Flue Outlet
36
26
9
11
23
24
Fig. 2
5
25
22
12
NOTE
ABCD

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SECTION 2 TECHNICAL DATA
2.1 Central heating 726 730 735
Heat input (kW) 28.2 32.6 37.8
Maximum heat output (kW) 26.0 30.1 35.2
Minimum heat output (kW) 8.28 8.93 9.22
Minimum working pressure 0.45 bar
Maximum working pressure 3.0 bar
Minimum flow rate 350 l/h
2.2 Domestic hot water
Maximum input (kW) 28.2 32.6 37.8
Maximum output (kW) 26.0 30.1 35.2
Minimum output (kW) 8.28 8.93 9.22
Flow rate (35oC rise) 10.6 l/min 12.3 l/min 14.4 l/min
Maximum inlet pressure 6.0 bar
Minimum inlet pressure 0.15 bar
Minimum flow rate 2.5 l/min
2.3 Gas pressures
Inlet pressure (G20) 20.0 mbar
Burner pressure maximum 9.8 mbar 9.6 mbar
Burner pressureminimum 1.1 mbar 0.8 mbar 0.7 mbar
Maximum gas rate 2.98 m3/h 3.45 m3/h 4 m3/h
Minimum gas rate 0.95 m3/h 1.02 m3/h 1.05 m3/h
Injector size (quantity) 12 x 1.4 mm 14 x 1.4 mm 16 x 1.4 mm
2.4 Expansion vessel
Capacity 8-litres 10-litres
Maximum system volume 76-litres 95-litres
Pre-chargepressure 1.0 bar
2.5 Dimensions
Height 820mm
Width 400mm 450mm 500mm
Depth 350mm
Dry weight (kg) 37.0 40.0 46.0
2.6 Clearances
Sides 12mm
Top 150mm from casing or 25mm above flue elbow (whichever is applicable)
Bottom 150mm
Front 600mm
2.7 Connections
Flow & return 22mm
Hot & cold water 15mm
Gas 15mm
Safety valve 15mm
2.8 Electrical
Voltage (V/Hz) 230/50
Powerconsumption 140W 150W 160W
Internal fuse 2A
External fuse 3A
2.9 Flue details (concentric)
Maximum horizontal flue length (60/100mm) 4.0m 3.4m 2m
Maximum vertical flue length (60/100mm) 4.8m 4.2m 2.8m
Maximum horizontal flue length (80/125mm) 10.0m 8.5m 5m
Maximum vertical flue length (80/125mm) 10.8m 9.3m 5.8m
2.9A Flue Details (twin pipes)
Maximum horizontal flue length (80mm + 80mm) 14m+14m 14m+14m 7m+7m
Maximum vertical flue length (80mm + 80mm) 14m+14m 14m+14m 7.8m+7.8m
2.10 Efficiency
SEDBUK (%) 80.3 80.3 80.3

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2.11 PUMP DUTY
Fig. 3 shows the flow-rate available – af-
terallowingfor pressure loss through the
appliance – for system requirements.
When using this graph, apply only the
pressure loss of the system. The graph
is based on a 20oC temperature differen-
tial.
SECTION 2 TECHNICAL DATA
Fig. 3
Water pressure (mbar)
Litres Per Hour
100
200
300
400
500
600
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
2.12 Emissions
Appliance
NOx max/min 160/140 180/120 150/130
CO max/min 120/120 140/100 130/130
CO2 max/min 6.95/3.45 6.70/3.20 7.0/3.40
CO/CO2 ratio max/min 0.0017 to 1/0.0035 to 1 0.0021 to 1/0.0031 to 1 0.0019 to 1/0.0038 to 1
726 730
Fig. 4
735
Key Location Minimum distance
A Belowanopening(window,air-brik, etc.) 300mm
B Aboveanopening (window,air-brik, etc.) 300mm
C Tothe side ofanopening (window, air-brik, etc.) 300mm
D Belowgutter,drain-pipe, etc. 75mm
E Beloweaves 200mm
F Belowbalcony, car-portroof,etc. 200mm
G Tothe side ofasoil/drain-pipe,etc. 150mm
H Frominternal/external cornerorboundary 300mm
I Aboveground,roof, or balcony level 300mm
J Fromasurfaceorboundaryfacingtheterminal 600mm
K Fromaterminalfacingaterminal 1200mm
L Fromanopeninginthecar-portintothe building 1200mm
M Vertically from a terminal on the same wall 1500mm
N Horizontallyfromaterminalon the same wall 300mm
P Fromastructuretothe side of theverticalterminal 300mm
Q Fromthetopofthe vertical terminalto the roof flashing Asdeterminedbythe fixed collar
oftheverticalterminal

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SECTION 3 GENERAL REQUIREMENTS (UK)
This appliance must be installed by a competent
person in accordance with the Gas Safety (In-
stallation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in accord-
ance with the relevant requirements of the Gas
Safety(Installation & Use) Regulations,the local
buildingregulations,thecurrentI.E.E.wiringregu-
lations, the bylaws of the local water undertak-
ing, the Building Standards (Scotland) Regula-
tion and Building Standards (Northern Ireland)
Regulations.
Itshould be in accordance alsowith any relevant
requirements of the local authority and the rel-
evant recommendations of the following British
Standard Codes of Practice.
3.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or
internal space, although particular attention is
drawn to the requirements of the current I.E.E.
wiring regulations and in Scotland, the electrical
provisions of the Building Regulations, with re-
specttotheinstallation of the appliance in a room
or internal space containing a bath or shower.
Whenanappliance is installed in aroom or inter-
nal space containing a bath or shower, the appli-
ance or any control pertaining to it must not be
withinreach of a person usingthebathorshower.
The location chosen for the appliance must per-
mit the provision of a safe and satisfactory flue
and termination. The location must also permit
an adequate air supply for combustion purposes
and an adequate space for servicing and air cir-
culation around the appliance. Where the instal-
lation of the appliance will be in an unusual loca-
tion special procedures may be
Necessary, BS 6798 gives detailed guidance on
this aspect.
A compartment used to enclose the appliance
mustbe designed and constructed specificallyfor
thispurpose.An existingcompartment/cupboard
maybeutilisedprovidedthat it is modified to suit.
Detailsofessential features of compartment/cup-
board design including airing cupboard installa-
tions are given in BS 6798.This appliance is not
suitable for external installation.
3.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier
–must be checked to ensurethatitisofadequate
size to deal with the maximum rated input of all
the appliances that it serves. Installation pipes
must be fitted in accordance with BS 6891.
Pipe work from the meter to the appliance must
be of adequate size. Pipes of a smaller size than
the appliance gas inlet connection must not be
used.The installation must be tested for sound-
ness in accordance with BS6891.
Ifthe gas supplyservesmorethan one appliance,
it must be ensured that an adequate supply is
maintained to each appliance when they are in
use at the same time.
3.4 FLUE SYSTEM
The terminal should be located where the dis-
persalof combustionproductsisnot impededand
with due regard for the damage and discolora-
tion that may occur to building products located
nearby. The terminal must not be located in a
place where it is likely to cause a nuisance (see
fig. 4).
3.4 FLUE SYSTEM (Cont’d.)
In cold and/or humid weather, water vapour may
condense on leaving the terminal; the effect of
such pluming must be considered.
If installed less than 2m above a pavement or
platform to which people have access (including
balconies or flat roofs) the terminal must be pro-
tected by a guard of durable material.The guard
must be fitted centrally over the terminal. Refer
to BS 5440 Part 1, when the terminal is 0.5 me-
tres (or less) below plastic guttering or 1 metre
(or less) below painted eaves.
3.5 AIR SUPPLY
Thefollowing notes areintendedforgeneral guid-
ance only.
Thisapplianceis a room-sealed, fan-fluedboiler,
consequently it does not require a
Permanent air vent for combustion air supply.
When installed in a cupboard or compartment,
ventilation for cooling purposes is also not re-
quired.
BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION
BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PUR
POSES (2nd FAMILY GASES)
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART 1 APPLICATION, SELECTION, AND INSTALLTION OF EXPANSION VES
SELS AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

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3.6 WATER CIRCULATION
Detailedrecommendationsare given in BS 5449
Part 1 and BS 6798.The following notes are for
general guidance only.
3.6.1 PIPEWORK
ItisrecommendedthatcoppertubingtoBS2871
Part 1 is used in conjunction with soldered capil-
lary joints.
Where possible pipes should have a gradient to
ensureairiscarriednaturallytoair release points
and that water flows naturally to drain cocks.
Exceptwhereproviding useful heat, pipes should
be insulated to avoid heat loss and in particular
to avoid the possibility of freezing. Particular at-
tention should be paid to pipes passing through
ventilatedareas such as under floors,loft space,
and void areas.
3.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass,
consequently there is no requirement for an ex-
ternal by-pass, however the design of the sys-
tem should be such that it prevents boiler ‘cy-
cling’.
3.6.3 DRAIN COCKS
Thesemust be located in accessiblepositions to
facilitate draining of the appliance and all water
pipesconnected totheappliance.The draincocks
must be manufactured in accordance with BS
2879.
3.6.4 AIR RELEASE POINTS
These must be positioned at the highest points
in the system where air is likely to be trapped.
They should be used to expel trapped air and
allow complete filling of the system.
3.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel
to accommodate the increased volume of water
when the system is heated. It can accept up to 8
litres(726/730) ofexpansionfromwithinthesys-
tem, generally this is sufficient, however if the
system has an unusually high water content, it
may be necessary to provide additional expan-
sion capacity (see 6.19).
3.6.6 FILLING POINT
A method for initial filling of the system and re-
placing water lost during servicing etc. has been
provided.This method of filling complies with the
currentWaterSupply(WaterFittings)Regulations
1999 and Water Bylaws 2000 (Scotland).
3.6.7 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 least 1 metre above the
highest point in the system and at least 5 metres
above the boiler (see fig. 5).
The cold feed from the make-up vessel or tank
must be fitted with an approved non-return valve
andstopcockforisolationpurposes.Thefeedpipe
should be connected to the return pipe as close
to the boiler as possible.
3.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be
indicative of a leak. Care should be taken during
the installation of the appliance to ensure all as-
pects of the system are capable of withstanding
pressures up to at least 3 bar.
3.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V
@ 50Hz electrical supply; it must be protected
with a 3-amp fuse.The method of connection to
the mains electricity supply must allow for com-
plete isolation from the supply. The preferred
method is by using a double-pole switch with a
contact separation of at least 3mm. The switch
must only supply the appliance and its corre-
sponding controls, i.e. time clock, room thermo-
stat, etc. Alternatively an un-switched shuttered
socketwith afused3-pin plugbothcomplyingwith
BS 1363 is acceptable.
3.8 SHOWERS
Iftheapplianceis intended foruse with a shower,
the shower must be thermostatically controlled
andbe suitableforuse with a combinationboiler.
3.9 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of com-
bustible material, a sheet of fireproof material
must protect the wall.
Fig. 5
Make-up vessel
or tank
Automatic
air-vent
Non-return
valve Stopcock
5.0 metres minimum
Heating
return

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3.10 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building,itshouldbefittedinaccordancewiththe
Institute of Gas Engineers publication (IGE/UP/
7) ‘Guide for Gas Installations in Timber Frame
Buildings’.
3.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
usewith lowwater-content,copper heatexchang-
ers – is used to protect the boiler and system
from the effects of corrosion and/or electrolytic
action. Theinhibitor mustbeadministered instrict
accordancewiththe manufacturers* instructions.
*Fernox and Sentinel manufacture products that
have proved suitable for use with Vokera appli-
ances.Vokera Ltd.cannot comment on the suit-
ability of any other such product with our appli-
ances.
Fig. 6
Thisappliance must be installed bya competent
person in accordance with and defined by, the
Standard Specification (Domestic Gas Installa-
tions) Declaration (I.S. 813).
3A.1 RELATED DOCUMENTS
The installation of this boiler must be in accord-
ance with the relevant requirements of the local
building regulations, the current ETCI National
Rules for Electrical Installations, and the bylaws
of the local water undertaking.
Itshouldbeinaccordance also with any relevant
requirementsofthelocal and/or district authority.
3A.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or
internal space, although particular attention is
drawn to the requirements of the current ETCI
NationalRules for Electrical Installations, and I.S.
813, Annex K.
When an appliance is installed in a room or in-
ternalspacecontaininga bath or shower,the ap-
pliance or any control pertaining to it must not be
SECTION 3A GENERAL REQUIREMENTS (EIRE)
withinreachof a person using the bath orshower.
The location chosen for the appliance must per-
mit the provision of a safe and satisfactory flue
and termination. The location must also permit
an adequate air supply for combustion purposes
and an adequate space for servicing and air cir-
culation around the appliance. Where the instal-
lation of the appliance will be in an unusual loca-
tion special procedures may be necessary, refer
to I.S. 813 for detailed guidance on this aspect.
A compartment used to enclose the appliance
mustbedesigned and constructed specifically for
thispurpose. Anexistingcompartment/cupboard
maybeutilised provided that it is modified tosuit.
This appliance is not suitable for external instal-
lation.
3A.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier
–mustbe checked to ensure that it isofadequate
size to deal with the maximum rated input of all
the appliances that it serves. Installation pipes
must be fitted in accordance with I.S. 813.

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Pipe work from the meter to the appliance must
beofadequate size. Pipes of a smaller size than
the appliance gas inlet connection must not be
used. The installation must be tested for sound-
ness in accordance with I.S. 813.
If the gas supply serves more than one appli-
ance, it must be ensured that an adequate sup-
ply is maintained to each appliance when they
are in use at the same time.
3A.4 FLUE SYSTEM
The terminal should be located where the dis-
persalof combustionproductsisnot impededand
with due regard for the damage and discolora-
tion that may occur to building products located
nearby. The terminal must not be located in a
place where it is likely to cause a nuisance (see
I.S. 813).
In cold and/or humid weather, water vapour may
condense on leaving the terminal; the effect of
such pluming must be considered.
If installed less than 2m above a pavement or
platform to which people have access (including
balconies or flat roofs) the terminal must be pro-
tected by a guard of durable material. The guard
must be fitted centrally over the terminal. Refer
to I.S. 813, when the terminal is 0.5 metres (or
less) below plastic guttering or 1 metre (or less)
below painted eaves.
3A.5 AIR SUPPLY
Thefollowing notes areintendedforgeneral guid-
ance only.
Thisapplianceis a room-sealed, fan-fluedboiler,
consequentlyit does not requirea permanent air
vent for combustion air supply.
When installed in a cupboard or compartment,
ventilation for cooling purposes is also not re-
quired.
3A.6 WATER CIRCULATION
Specific recommendations are given in I.S. 813.
Thefollowingnotesarefor generalguidance only.
3A.6.1 PIPEWORK
It is recommended that copper tubing be used in
conjunction with soldered capillary joints.
Where possible pipes should have a gradient to
ensureairiscarriednaturallytoairreleasepoints
and that water flows naturally to drain cocks.
Exceptwhereproviding useful heat, pipes should
be insulated to avoid heat loss and in particular
to avoid the possibility of freezing. Particular at-
tention should be paid to pipes passing through
ventilatedareas such as underfloors, loft space,
and void areas.
3A.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass,
consequently there is no requirement for an ex-
ternal by-pass, however the design of the sys-
tem should be such that it prevents boiler ‘cy-
cling’.
3A.6.3 DRAIN COCKS
Thesemust be locatedin accessible positionsto
facilitate draining of the appliance and all water
pipes connected to the appliance.
3A.6.4 AIR RELEASE POINTS
Thesemustbepositionedatthe highest points in
thesystemwhere air is likelytobetrapped. They
should be used to expel trapped air and allow
complete filling of the system.
3A.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel
to accommodate the increased volume of water
when the system is heated. It can accept up to 8
litres (726/730) or 10 litres (735) of expansion
fromwithinthe system, generallythisissufficient,
howeverifthesystem hasanunusuallyhighwater
content,it may be necessarytoprovideadditional
expansion capacity (see 6.19).
3A.6.6 FILLING POINT
A method for initial filling of the system and re-
placing water lost during servicing etc. has been
provided. You should ensure this method of fill-
ing complies with the local water authority regu-
lations.
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 least 1 metre above the
highest point in the system and at least 5 metres
above the boiler (see fig. 5).
The cold feed from the make-up vessel or tank
must be fitted with an approved non-return valve
and stopcock for isolation purposes. The feed
pipe should be connected to the return pipe as
close to the boiler as possible.
3A.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be
indicativeof a leak. Care should betaken during
the installation of the appliance to ensure all as-
pects of the system are capable of withstanding
pressures up to at least 3 bar.
3A.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V
@ 50Hz electrical supply; it must be protected
with a 3-amp fuse. The method of connection to
the mains electricity supply must allow for com-
plete isolation from the supply. The preferred
method is by using a double-pole switch with a
contact separation of at least 3mm. The switch
must only supply the appliance and its corre-
sponding controls, i.e. time clock, room thermo-
stat, etc.
3A.8 SHOWERS
Iftheapplianceisintended for use with a shower,
the shower must be thermostatically controlled
andbe suitableforusewith a combination boiler.

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3A.9 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of com-
bustible material, a sheet of fireproof material
must protect the wall.
3A.10 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building,itshouldbe fitted in accordance with I.S.
813 and local Building Regulations.
The Institute of Gas Engineers publication (IGE/
UP/7) ‘Guide for Gas Installations in Timber
FrameBuildings’givesspecificadviceonthistype
ofinstallation.
3A.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
usewith lowwater-content,copperheat exchang-
ers – is used to protect the boiler and system
from the effects of corrosion and/or electrolytic
action. Theinhibitor mustbeadministeredinstrict
accordancewiththemanufacturers*instructions.
*Fernox and Sentinel manufacture products that
have proved suitable for use with Vokera appli-
ances. Vokera Ltd.cannot comment on the suit-
ability of any other such product with our appli-
ances.
3A.12 DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S.
813) must be provided on completion of the in-
stallation
A copy of the declaration must be given to the
responsible person and also to the gas supplier
if required.
SECTION 4 INSTALLATION
4.1 DELIVERY
Duetothe weight of the appliance it maybe nec-
essary for two people to lift and attach the appli-
anceto its mounting. The applianceis contained
within a heavy-duty cardboard carton. Lay the
cartononthe floor with the writing the correct way
up.
4.2 CONTENTS
Contained within the carton is:
●●
●●
●The boiler
●●
●●
●The fixing jig and wall bracket
●●
●●
●Template
●●
●●
●Anaccessories packcontainingapplianceserv-
ice connections and washers
●●
●●
●The instruction pack containing the installation
& servicing instructions, user instructions,
Benchmark logbook, guarantee registration
card, and a 3-amp fuse
4.3 UNPACKING (fig. 6A)
At the top of the carton pull both sides open – do
not use a knife – unfold the rest of the carton
from around the appliance, carefully remove all
protectivepackaging from the appliance, andlay
the accessories etc. to one side. Protective
gloves should be used to lift the appliance, the
appliance back-frame should be used for lifting
points.
4.4 PREPARATION FOR MOUNTINGTHE APPLI-
ANCE
The appliance should be mounted on a smooth,
vertical,non-combustiblesurface, which must be
capableofsupporting the full weight ofthe appli-
ance. Careshouldbeexercisedwhendetermin-
ing the position of the appliance with respect to
hidden obstructions such as pipes, cables, etc.
When the position of the appliance has been
decided – using the template supplied – care-
fully mark the position of the combined fixing jig
and wall- mounting bracket (see fig. 6) and flue-
hole (if applicable).
4.5 FITTING THE FLUE
The top flue outlet permits both horizontal and
vertical flue applications to be considered, alter-
natively, the Vokera twin flue system can be uti-
lised if longer flue runs are required.
4.5.1 CONCENTRIC HORIZONTAL FLUE
(For concentric vertical flue, see 4.5.2)
(For twin flue applications, see 4.5.3)
Theappliancecanbeused with either the stand-
ard 60/100mm concentric flue system or the op-
tional 80/125mm concentric flue system.
NOTE
These instructions relate only to the standard
60/100mm concentric flue system. For specific
details on the installation of the 80/125mm con-
centric flue system please refer to the instruc-
tions supplied.
The appliance flue outlet elbow can be rotated
through 360° on its vertical axis. In addition the
flue may be extended from the outlet elbow in
the horizontal plane (see 2.9). A reduction must
also be made to the maximum length (see table
below) when additional bends are used.
Fig. 6A

Supplied By www.heating spares.co Tel. [phone]
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Horizontal flue terminals and accessories
Part No. Description Min-Max Length
2359029 Standard flue kit. For 833mm
use with add. Bends & (dimension ‘X’)
extensions
2359119 Telescopic flue kit.
2359069 750mm extension 750mm
2359079 1500mm extension 1500mm
2359089 Telescopic extension 350 – 490mm
2359049 45° bend (pair) N/A
2359059 90° bend N/A
0225760 Wall bracket (5) N/A
Bend Reduction in maximum flue length for each bend
45° bend 0.5 metre
90° bend 1.0 metre
Fig. 7
Reduction for additional bends
Using the template provided, mark and drill a
107mmholefor the passage of the flue pipe. The
holeshould have a 1° dropfrom the boiler toout-
side, to eliminate the possibility of rainwater en-
tering the appliance via the flue.
The fixing holes for the wall-mounting bracket/
fixing jig should now be drilled and plugged, an
appropriate type and quantity of fixing should be
used to ensure that the bracket/jig is mounted
securely. Once thebracket/jighas been secured
tothewall,mounttheapplianceontothebracket.
4.5.1.1 FITTINGTHE HORIZONTAL FLUE KIT (see
4.5.1)
Carefully measure the distance from the centre
of the appliance flue outlet to the face of the
outside wall (dimension ‘X’ see fig. 7). Ensure
the inner (60mm) pipe is fully inserted into the
outer (100mm) pipe (when the inner pipe is fully
inserted, it stands proud of the outer pipe by
7.5mm).Add 32mm to dimension ‘X’ to give the
overall flue length (dimension ‘Y’).
NOTE
The standard horizontal flue kit (part no.
2359029) is suitable for a distance (dimension
‘Y’) of up to 865mm.
The telescopic flue kit (part no.2359119) is suit-
able for a distance (dimension ’Y’) of up to
600mm.
Dimension ‘Y’ is measured from the end of the
terminal to the end of the outer (100mm) pipe.
The internal trim should be fitted to the flue pipe
before connection of the 90° bend.
Using the dimensions given in fig. 9 as a refer-
ence, mark and cut a 105mm hole in the ceiling
and/or roof.
Fit the appropriate flashing plate to the roof and
insert the vertical flue terminal through the flash-
ing plate from the outside, ensuring that the col-
lar on the flue terminal fits over the flashing.
The fixing holes for the wall-mounting bracket
should now be drilled and plugged, an appropri-
ate type and quantity of fixing should be used to
ensure that the bracket is mounted securely.
Once the bracket has been secured to the wall,
mount the appliance onto the bracket
If the horizontal flue kit (2359029) requires to be
cut to the correct size (dimension ‘Y’), you must
ensure that the inner (60mm) pipe stands proud
of the outer (100mm) pipe by 7.5mm (see fig. 8).
Ensure any burrs are filed or removed and that
any seals are located properly before assembly.
The telescopic flue terminal should be adjusted
totheappropriatelengthandthen fixed using the
securing screw supplied.
4.5.1.2 STANDARD FLUE KIT (2359029)
Hold the inner (60mm) pipe of the terminal as-
semblyandconnectto the push-fit end of the 90°
bend (supplied) using a twisting action. Insert
theassembled flueintothepreviously drilledhole.
Using the clips & screws supplied, connect the
flue assembly to the boiler, ensuring that the ter-
minal protrudes past the finished outside wall by
the correct length (135mm).
4.5.1.3TELESCOPIC FLUE KIT (2359119)
Connectthe 60mm push-fit connectionoftheflue
bend (supplied) to the telescopic flue assembly
usinga twisting action. Insert the assembledflue
into the previously drilled hole. Using the clips &
screws supplied, connect the flue assembly to
the boiler, ensuring that the terminal protrudes
pastthe finished outsidewallbythe correctlength
(135mm).
Fig. 8
Dimension “Y”
Dimension “X”
Max 833 mm
135 mm
7,5
110
Boiler
Push-fit connection
Terminal or
extension
7,5 mm
Inner 60mm clip
Outer 100mm clip

Supplied By www.heating spares.co Tel. [phone]
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You must ensure that the entire flue system is
properly supported and connected.
Seal the flue assembly to the wall using cement
or a suitable alternative that provides satisfac-
tory weatherproofing. The exterior trim can now
be fitted.
4.5.1.4 EXTENDINGTHE HORIZONTAL FLUE
The horizontal flue system can be extended us-
ing bends and/or extensions from the Uni-Flue
range (see 4.5.1).
Connect the bend – supplied with the terminal
kit– tothetopof the boilerusingtheclips, screws,
& gaskets supplied. The additional bends & ex-
tensions have an internal push-fit connection,
care should be taken to ensure that the correct
seal is made when assembling the flue system.
Connect the required number of flue extensions
or bends (up to the maximum equivalent flue
length)to theflueterminalusing the clips,screws,
& gaskets supplied (see fig.8 & 8A). The interior
trim should be fitted at this point.
NOTE
Whencutting an extensiontotherequiredlength,
you must ensure that the excess is cut from the
plain end of the extension, and that the inner
(60mm)pipe is7.5mmlonger thanouter(100mm)
pipe (see fig. 8 & 8A). Remove any burrs, and
check that any seals are located properly.
You must ensure that the entire flue system is
properly supported and connected.
Seal the flue assembly to the wall using cement
orasuitable alternative that will provide satisfac-
tory weatherproofing. The exterior trim can now
be fitted.
4.5.2 CONCENTRIC VERTICAL FLUE
Theappliancecanbeusedwitheitherthestand-
ard 60/100mm concentric flue system or the op-
tional 80/125mm concentric flue system.
NOTE
These instructions relate only to the standard
60/100mm concentric flue system. For specific
details on the installation of the 80/125mm con-
centric flue system please refer to the instruc-
tions supplied.
The vertical flue terminal can be connected di-
rectly to the appliance flue outlet. Alternatively,
an extension or bend can be connected to the
appliance flue outlet if desired (see 4.4.2), how-
everifadditionalbends arefitted,areductionmust
be made to the maximum flue length (see table
below).
Bend Reduction in maximum flue length for each bend
45° bend 0.5 metre
90° bend 1.0 metre
Vertical flue terminal and accessories
Part No. Description Length
2359039 Vertical flue terminal 1.0 metre
0225770 Pitched roof flashing plate N/A
0225765 Flat roof flashing plate N/A
2359069 750mm extension 750mm
2359079 1500mm extension 1500mm
2359049 45° bend (pair) N/A
2359059 90° bend N/A
0225760 Wall bracket (5) N/A
Reduction for bends
Usingthedimensionsgiveninfig.9 as a reference, mark
and cut a 105mm hole in the ceiling and/or roof.
Fit the appropriate flashing plate to the roof and insert
the vertical flue terminal through the flashing plate from
the outside, ensuring that the collar on the flue terminal
fits over the flashing.
Thefixing holes forthewall-mountingbracket shouldnow
be drilled and plugged, an appropriate type and quantity
of fixing should be used to ensure that the bracket is
mounted securely. Once the bracket has been secured
to the wall, mount the appliance onto the bracket.
Fig. 8A

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IMPORTANT
The vertical flue terminal is 1.0 metre in length
andcannotbecut; therefore it may be necessary
toadjustthe height of the appliance to suitor use
a suitable extension.
Connect the vertical flue assembly to the boiler
flue spigot using the 60mm & 100mm clips, gas-
kets, & screws (supplied), ensuring the correct
seal is made.The flue support bracket (supplied
with the vertical flue kit) can now be fitted.
If the vertical flue requires extension/s or addi-
tionalbend/s, connect therequirednumberof flue
extensionsorbends(upto the maximum equiva-
lent flue length) between the boiler and vertical
flue assembly (see fig. 8).
NOTE
Whencuttinganextension to the required length,
you must ensure that the excess is cut from the
plain end of the extension and that the inner
(60mm)pipe is7.5mmlongerthan outer(100mm)
pipe (see fig. 8). Remove any burrs, and check
that any seals are located properly.
You must ensure that the entire flue system is
properly supported and connected.
4.5.3 TWIN FLUE SYSTEM
TheVokeratwin flue system enablesgreaterflue
distances to be achieved (see 4.4.2) than that of
a concentric flue system. It can be used for hori-
zontal or vertical applications, however the twin
flue system must be converted to the dedicated
concentric flue kit for termination. It is essential
that the installation of the twin flue system be
carriedout in strict accordancewiththeseinstruc-
tions.
GUIDANCE NOTES ON TWIN FLUE INSTAL-
LATION
●●
●●
●The flue must have a fall back of 1° back to the
appliance to allow any condensate that may
formin the flue system todrain via the conden-
sate drain. Consideration must also be given
to the fact that there is the possibility of a small
amount of condensate dripping from the termi-
nal.
Bend Reduction in maximum flue length for each bend
45° bend 1.0 metre
90° bend 1.0 metre
Reduction for bends
Part No. Description Length
0225805 Horizontal flue terminal 1.0 metre
0225810 Vertical flue terminal 1.0 metre
362 Twin adapter kit N/A
0225770 Pitched roof flashing plate N/A
0225765 Flat roof flashing plate N/A
0225815 Condensate drain kit N/A
0225820 0.25m extension (pair) 250mm
0225825 0.5m extension (pair) 500mm
0225830 1.0m extension (pair) 1000mm
0225835 2.0m extension (pair) 2000mm
0225840 45° bend (pair) N/A
0225845 90° bend (pair) N/A
0225850 Twin bracket (5) N/A
0225855 Single bracket (5) N/A
Twin flue accessories
MOUNTING THE BOILER
Thefixing holes forthewall-mountingbracket shouldnow
be drilled and plugged, an appropriate type and quantity
of fixing should be used to ensure that the bracket is
mounted securely. Once the bracket has been secured
to the wall, mount the appliance onto the bracket.
Fig. 10
●●
●●
●Ensurethat the entirefluesystemisadequately
supported, use at least one bracket for each
extension.
●●
●●
●The entire flue system must be adequately in-
sulated to maintain heat within the flue system
thereby reducing the possibility of condensate
production.
●●
●●
●As the exhaust outlet pipe can reach very high
temperatures it must be protected to prevent
persons touching the hot surface.
●●
●●
●Thecondensatedrain pipe must be connected
in accordance with building regulations
Fig. 9

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4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (fig.
10)
●●
●●
●Insertthe exhaust connection manifoldontothe
appliance flue outlet.
●●
●●
●Place the silicone seal (supplied with twin
adapter kit) over the rim of the exhaust con-
nectionmanifold.
●●
●●
●Removetherequiredblankingplate(locatedto
the left and right of the appliance flue outlet)
and – using the same screws – install the air
baffle.
●●
●●
●Usingtheholeintheexhaust connection mani-
fold as a guide, drill a 3mm hole in the appli-
ance flue spigot and secure the exhaust mani-
foldconnectiontothefluespigotusingthescrew
provided.
4.5.3.2 INSTALLATION OF CONDENSATE DRAIN
KIT (fig. 11)
The condensate drain kit must be fitted within 1
metre of the appliance flue outlet. It is recom-
mended that the condensate drain kit should be
fitted in the vertical plane, however it can be fit-
ted horizontally with care.
●●
●●
●Fit the first bend to the condensate drain kit or
exhaust connection manifold by firmly push-
ing in to position.
●●
●●
●Usingthetwo holes in the exhaustconnection
manifold as a guide, drill a 3mm hole in each
and secure using the screws provided.
●●
●●
●Connect the air inlet pipe to the air baffle as
above.
●●
●●
●Primethecondensatetrapwithclean waterprior
to commissioning the appliance.
●●
●●
●The twin flue pipes extensions and accesso-
ries can now be installed by pushing together
(theplainend of each extension or bendshould
bepushed approximately50mmintothe female
socket of the previous piece).
4.5.3.3 HORIZONTALTERMINATION (See fig. 12)
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 shortened.
●●
●●
●A 130mm hole is required for the passage of
the concentric terminal through the wall.
●●
●●
●The air inlet pipe must always be level with or
below, that of the exhaust pipe.
Depending on site conditions it may be prefer-
able to install the terminal assembly prior to fit-
ting the twin flue pipes.
Mark and drill a 130mm hole for the passage of
thehorizontalflueterminal, ensuring that there is
a 1° fall back to the boiler (17mm per 1000mm).
Insert the terminal assembly into the flue hole.
Push-fitthetwin flue pipes onto the concentricto
twinconverterboxensuring that the exhaust pipe
connects to the exhaust connection on the con-
centric to twin converter.
Ifnecessary cut the plainends (male) ofthe twin
flue pipes to allow connection to the concentric
to twin converter.
NOTE; before cutting twin flue pipes ensure al-
lowances have been made for connection onto
theprevious piece and onto the concentrictotwin
converter. The last twin flue pipes must be
pushed 50mm onto the male spigots of the con-
centric to twin converter.
NOTE;
You must ensure that the entire flue system is
properly supported and connected.
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.
Fig. 12
Fig. 11

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4.5.3.4 VERTICAL TERMINATION (See 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
converter box and cannot be shortened.
●●
●●
●A 130mm hole is required for the passage of
theconcentricterminalthroughtheceilingand/
or roof.
Depending on site conditions it may be prefer-
able to install the terminal assembly prior to fit-
ting the twin flue pipes.
Fit the appropriate flashing plate to the roof and
insert the vertical flue terminal through the flash-
ing plate from the outside, ensuring that the col-
lar on the flue terminal fits over the flashing.
Push-fitthetwinflue pipes onto the concentric to
twinconverter ensuringthatthe exhaustpipecon-
nects to the exhaust connection on the concen-
tric to twin converter.
Ifnecessary cut the plain ends(male) of the twin
flue pipes to allow connection to the concentric
to twin converter.
NOTE
●●
●●
●Beforecuttingtwinfluepipesensureallowances
havebeenmade for connection onto the previ-
ous piece and onto the concentric to twin con-
verter. The last twin flue pipes mustbepushed
50mm onto the male spigots of the concentric
to twin converter.
●●
●●
●You must ensure that the entire flue system is
properly supported and connected.
●●
●●
●Ensurethatanyhorizontalsectionsofpipehave
a 1° fall towards the appliance (17mm per
1000mm).
Fig. 13
4.6 CONNECTING THE GAS AND WATER
The appliance is supplied with a fixing jig that
includes service valves (fig. 14). The service
valves are of the compression type. The acces-
soriespackcontainssealing washers etc, for use
with the service valves.
Whenconnecting pipe work tothevalves,tighten
the compression end first then insert the sealing
washers before tightening the valve to the appli-
ance.
NOTE
It will be necessary to hold the valve with one
spanner whilst tightening with another.
Fig. 14
Filling Loop
Cold water Inlet
Stopcock/filling
valve
Hot water
Outlet
Gas
Cock
Safety valve
outlet
C/H return
valve
C/H flow
valve
4.6.1 GAS (fig. 6 & 14)
The appliance is supplied with a 15mm service
valve, connect a 15mm pipe to the inlet of the
valve and tighten both nuts.
NOTE
It will be necessary to calculate the diameter of
the gas supply pipe to ensure the appliance has
an adequate supply of gas.
4.6.2 FLOW & RETURN (fig. 6 & 14)
The appliance is supplied with 22mm service
valves for the flow and return connections, con-
nect a 22mm pipe to the inlet of each valve and
tighten both nuts.
NOTE
Depending on system requirements, it may nec-
essary to increase the size of the flow & return
pipe work after the service valve connections.

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4.6.3 COLD WATER INLET (fig. 6 & 14)
Theapplianceissupplied with a 15mm combined
stopcock and double check-valve, connect a
15mmpipeto the inlet of the stopcockandtighten
both nuts.
4.6.4 HOT WATER OUTLET (fig. 6 & 14)
Theappliance issuppliedwitha 15mm outletcon-
nection, connect a 15mm pipe to the outlet con-
nection and tighten both nuts.
4.6.5 SAFETY VALVE (fig. 6 & 14)
Connect the safety valve connection pipe be-
tween the safety valve outlet and the fixing jig.
Connect a discharge pipe to the fixing jig con-
nection and tighten. The discharge pipe must
have a continuous fall away from the appliance
to outside and allow any water to drain away
therebyeliminatingthepossibilityof freezing. The
dischargepipe must terminate inapositionwhere
any water – possibly boiling – discharges safely
without causing damage or injury, but is still vis-
ible.
4.7 ELECTRICAL CONNECTIONS
Theelectricalsupplymust be as specified in sec-
tion 3.7. A qualified electrician should connect
the electrical supply to the appliance. If controls
–externaltotheappliance – are required, a com-
petent person must undertake the design of any
externalelectricalcircuits, please refer to section
8 for detailed instructions. ANY EXTERNAL
CONTROL OR WIRING MUST BE SERVED
FROMTHE SAME ISOLATOR ASTHATOFTHE
APPLIANCE. The supply cable from the isolator
to the appliance must be 3-core flexible sized
0.75mm to BS 6500 or equivalent. Wiring to the
appliance must be rated for operation in contact
with surfaces up to 90°C.
4.7.1 CASING REMOVAL
Togaininternalaccesstotheapplianceyoumust
first remove the casing, proceed as outlined be-
low:
●●
●●
●Pressthecontrolscoverto release the controls
cover catch
●●
●●
●Locate and unscrew the 2 screws that secure
thecontrolsfascia to the appliance casing (see
fig 15).
●●
●●
●Gently lower the control fascia until it rests.
●●
●●
●Removethe 2screwslocatedat theLeft&Right
of the underside of the casing.
●●
●●
●Lift the casing upward to disengage it from the
top locating hooks and then remove.
●●
●●
●Store the casing and screws safely until re-
quired. Re-fit in the reverse order.
Fig. 15
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the
left side of the control fascia (see fig. 15). Locate
and remove the screws securing the terminal
block cover.
NOTE
The appliance comes with a factory fitted link to
allow basic operation of the boiler via the mode
selector switch. If it is anticipated that external
controlswillberequiredplease refer to the wiring
diagrams in section 8 for more detailed informa-
tion.
4.7.3 CONNECTING THE MAINS (230V) INPUT (see
fig. 16)
Removetheterminal block cover as described in
4.7.2. Pass the cable through the cable anchor-
age point. At plug M16 on the appliance control
PCB there are 7 terminals from Front to Back
they are:
1. NEUTRAL
2. NEUTRAL (supply for clock)
3. LIVE
4. LIVE (supply to clock)
5. TA
6. TA
7. (Spare)
A

Supplied By www.heating spares.co Tel. [phone]
16 Linea
Fig. 16
Connectthesupplycablewires (LIVE, and NEU-
TRAL) to their corresponding terminals on the
appliance terminal block. Connect the EARTH
wire to the EARTH block (see fig. 16) ensuring
thatit’sleft slightlylonger that theothers,this will
prevent strain on the EARTH wire should the
cable become taut.
Donot removethelinkwire(betweenTA&Spare)
unless additional external controls are to be fit-
ted (see section 8).
4.7.4 CONNECTING THE VOKERA TIME CLOCK
(part no. 201 & 202)
Theappliance is suppliedwith aclock connector
plug that is connected to plug M16 on the appli-
ance terminal block. The clock connector plug is
for use with the clock harness that is included in
the accessory pack and facilitates an easy con-
nection to the optional Vokera time clock.
To fit the Vokera time clock:
●●
●●
●Remove the appliance PCB cover.
●●
●●
●Remove and discard the wiring harness sup-
plied with the clock.
●●
●●
●Using the clock wiring harness supplied in the
accessory pack, connect the 4-wires to the
clock as shown in fig 16.
●●
●●
●Remove the clock aperture plate from the ap-
pliance.
●●
●●
●Remove the push-out blanking disc from the
clock aperture plate (fig. 17).
●●
●●
●Securetheclocktotheapertureplateusing the
screws provided with the clock (fig. 17).
●●
●●
●Refittheclock aperture plate ensuring the clock
is positioned the correct way up.
●●
●●
●Remove the Red link-wire plug from the appli-
ance clock connector plug.
●●
●●
●Connect the clock wiring harness to the clock
connector plug.
●●
●●
●Re-fit the appliance PCB cover and terminal
cover.
The securing screw on the cable anchorage
should now be tightened. This must be done be-
fore the control fascia is re-fitted in the upright
position. The appliance casing and screws can
now be re-fitted.
Fig. 17

Supplied By www.heating spares.co Tel. [phone]
17
Linea
SECTION 5 COMMISSIONING
5.1 GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for soundness and purge. Refer to
BS 6891 for specific instruction.
5.2 THE HEATING SYSTEM
Theappliance contains components thatmaybe-
come damaged or rendered inoperable by oils
and/or debris that are residual from the installa-
tion of the system, consequently it is essential
that the system be flushed in accordance with
the following instructions.
Fig. 18
5.3 INITIAL FILLING OF THE SYSTEM
Ensure both flow and return service valves are
open, remove appliance casing as described in
4.7.1,identifythe automatic air release valve and
loosenthedustcap by turning the cap anti-clock-
wise one full turn. IMPORTANT, THERE ARE
NOMANUALAIRRELEASEVALVESLOCATED
ONTHE APPLIANCE. Ensure all manual air re-
lease valves located on the heating system are
closed. Connect the filling loop as shown in fig.
14, slowly proceed to fill the system by firstly
opening the inlet valve connected to the flow
valve,and then turningtheleveronthe combined
stopcock and check valve, to the filling position
(see Fig. 18). As water enters the system the
pressuregaugewillbegin torise. Oncethegauge
has reached 1 BAR close both valves and begin
venting all manual air release valves, starting at
the lowest first. It may be necessary to go back
and top-up the pressure until the entire system
has been filled. Inspect the system for water
soundness, rectifying any leaks.
5.4 INITIAL FLUSHING
Thewhole of theheatingsystemmustbe flushed
both cold and hot as detailed in 5.8. Open all
radiatororheating valves and the appliance flow
&returnservicevalves. Draintheboilerandsys-
temfromthelowestpoints. Openthedrainvalve
full bore to remove any installation debris from
the boiler prior to lighting. Refill the boiler and
heating system as described in 5.3.
5.5 FILLING THE HOT WATER SYSTEM
Close all hot water outlets, turn appliance stop-
cock to the normal operating position (fig. 18),
slowlyopeneachoutletuntilairhasbeenexpelled
and clear water is discharged. Check pipe-work
etc. for water soundness.
5.6 PRE-OPERATION CHECKS
Before attempting the initial lighting of the appli-
ance, the following checks must be carried out:
●●
●●
●Ensureallgas service valves from the meterto
theapplianceare open and the supply pipe has
been properly purged.
●●
●●
●Ensurethe proper electrical checks havebeen
carried out, (see 7.7) particularly continuity, po-
larity, and resistance to earth.
●●
●●
●Ensure the 3 AMP fuse – supplied with the ap-
pliance – has been fitted.
●●
●●
●Ensurethesystemhasbeenfilled, vented, and
the pressure set to 1 BAR.
●●
●●
●Ensure the flue system has been fitted prop-
erly and in accordance with the instructions.
●●
●●
●Ensure all appliance service valves are open.
5.7 INITIAL LIGHTING
Ensure the electrical supply to the appliance is
switched on. Move the selector switch to the
Heating & Hot Water position, ensure the time
clock is switched to an ‘ON’ position and ensure
any other external controls are also calling for
heat.
The appliance will now operate in the pre-heat
mode as described in 1.2. Once the pre-heat
function has been completed, the appliance will
operateinthecentralheatingmodeasdescribed
in1.3. Should the appliance fail toignite, refer to
5.6 and/or section 7 (faultfinding).
5.7.1 CHECKING THE BURNER PRESSURE
Although the burner pressure is factory set, it is
necessarytocheckitduring commissioning. Iso-
late the appliance from the electrical supply and
attachasuitable manometer to the gas valve out-
let test-point (see fig. 19). Light the boiler as de-
scribed in 5.7, turn the Hot Water temperature
selectorto maximum, andopen fully aDHW out-
let (preferably the bath), allowing the appliance
tostabilise. Compare the reading on themanom-
eter with the value described in 2.3. If adjust-
ment is required, follow the detailed instructions
in section 7 (7.3).
Normal
Operating
Position
Filling
Position
Closed
Position

Supplied By www.heating spares.co Tel. [phone]
18 Linea
Once the burner pressure has been checked,
close the DHW outlet, isolate the appliance from
theelectrical supply,remove the manometer,and
tighten the gas valve outlet test nipple.
5.8 FINAL FLUSHING OFTHE HEATING SYSTEM
The system shall be flushed in accordance with
BS 7593. If a cleanser is to be used, it shall be
from a reputable manufacturer* and shall be ad-
ministeredinstrictaccordance with the manufac-
turers instructions.
*BothSentinelandFernoxmanufacture products
that have proved suitable for use withVokera ap-
pliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our ap-
pliances.
5.8.1 INHIBITORS
See Section 3 “general requirements”
5.9 SETTING THE BOILER OPERATING TEM-
PERATURE
The flow outlet temperature can be adjusted be-
tween 40°C - 80°C via the Heating thermostat
knob (see fig.1).
5.9.1 SETTING THE DOMESTIC HOT WATER TEM-
PERATURE
TheDHWoutlettemperaturecanbeadjustedbe-
tween 40°C - 65°C via the Hot Water thermostat
knob (see fig.1).
5.10 SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 1
BAR and a maximum of 1.5 BAR.
The actual reading should ideally be 1BAR plus
the equivalent height in metres (0.1 BAR = 1
metre) to the highest point in the system above
the base of the appliance (up to the maximum of
1.5 BAR total).
N.B. The safety valve is set to lift at 3 BAR/30
metres/45 psig.
To lower the system pressure to the required
value, pull lever on head of safety valve to re-
lease water until the required figure registers on
the pressure gauge (see fig. 1).
5.11 REGULATING THE HOT WATER
The appliance is fitted with a flow rate restrictor
that limits the maximum flow rate that can be
drawn through the appliance.
Linea 726
8-litre 9-litre 10-litre
(White) (Orange) (Blue)
Spare Fitted Spare
Linea 730
9-litre 10-litre 11-litre
(Orange) (Blue) (Beige)
Spare Fitted Spare
Linea 735
11-litre 12-litre 13-litre
(Beige) (Red) (Olive)
Spare Fitted Spare
Therestrictor eliminates the needtomanuallyad-
just the DHW flow rate. However if it is felt nec-
essary to further increase or decrease the avail-
able flow rate, spare restrictors are included in
the accessory pack.
The spare flow rate restrictors can be fitted to
either increase or decrease the maximum flow
rate. The tables above denote the size of
restrictorfitted and the spare restrictorssupplied
in the accessory pack. Each restrictor is colour-
coded to enable identification.
5.11.1 CHANGING THE FLOW RESTRICTOR
Referto6.19 for detailed instruction on changing
the flow restrictor.
5.11.2 REGULATINGTHE CENTRAL HEATING SYS-
TEM
Fully open all radiator and circuit valves and run
theappliancefor both heating and hot wateruntil
heatedwater iscirculating. Ifconditionsare warm
remove any thermostatic heads. Adjust radiator
returnvalvesandanybranch circuit return valves
until the individual return temperatures are cor-
rect and are approximately equal.
Compensator
tube
Protective
cap
Outlet
test-point
Inlet
test-point
Fig. 19