VOKERA Pinnacle User guide

Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Contents
Design principles & operating sequence Page
1.1 Principle components 2
1.2 Mode of operation (at rest) 2
1.3 Mode of operation (heating or hot water request) 2
1.4 Safety devices 2
Technical data Page
2.1 Central heating 3
2.2 Gas pressure 3
2.3 Expansion vessel 3
2.4 Dimensions 3
2.5 Clearances 3
2.6 Connections 3
2.7 Electrical 3
2.8 Flue details 3
2.9 Efficiency 3
2.10 Adjusting operating parameters 3
2.11 Emissions 3
2.12 Pump duty 4
General requirements (UK) Page
3.1 Related documents 5
3.2 Location of appliance 5
3.3 Gas supply 5
3.4 Flue system 5
3.5 Air supply 5
3.6 Water circulation 5
3.7 Electrical supply 6
3.8 Mounting on a combustible surface 6
3.9 Timber framed buildings 6
3.10 Condensate disposal 6
3.11 Inhibitors 6
General requirements (EIRE) Page
3A.1 Related documents 8
3A.2 Location of appliance 8
3A.3 Gas supply 8
3A.4 Flue system 8
3A.5 Air supply 8
3A.6 Water circulation 8
3A.7 Electrical supply 9
3A.8 Mounting on a combustible surface 9
3A.9 Timber framed buildings 9
3A.10 Condensate disposal 9
3A.11 Inhibitors 9
3A.12 Declaration of conformity 9
Installation Page
4.1 Delivery 10
4.2 Contents 10
4.3 Unpacking 10
4.4 Preparation for mounting the appliance 10
4.5 Fitting the flue 10
4.6 Connecting the gas & water 13
4.7 Condensate outlet 13
4.8 Automatic air release valve 14
4.9 Electrical connections 14
4.10 Casing removal 15
Commissioning Page
5.1 Gas supply installation 16
5.2 The heating system 16
5.3 Initial filling of the system 16
5.4 Initial flushing of the system 16
5.5 Pre-operation checks 16
5.6 Initial lighting 16
5.7 Final flushing of the heating system 16
5.8 Inhibitors 16
5.9 Appliance operating parameters 16
5.10 Parameters 3 & 4 16
5.11 Information mode 16
5.12 Setting the system design pressure 17
5.13 Regulating the central heating system 17
5.14 Checking dynamic gas pressure 17
5.15 Final checks 17
5.16 Instructing the user 17
Servicing Page
6.1 General 18
6.2 Routine annual servicing 18
6.3 Replacement of components 18
6.4 Component removal procedure 18
6.5 Pump head 18
6.6 Safety valve 18
6.7 Automatic air release valve 18
6.8 Pressure gauge 18
6.9 NTC thermistors (temperature sensors) 19
6.10 Printed circuit board (PCB) 19
6.11 Gas valve 19
6.12 Fan 19
6.13 Burner 19
6.14 Electrode 20
6.15 Injector 20
6.16 Automatic by-pass assembly 20
6.17 Condense trap 20
6.18 Condense pressure switch 20
6.19 Combustion cover 20
6.20 Expansion vessel 21
6.21 Input & status PCB 21
Checks, adjustments and fault finding Page
7.1 Checking appliance operation 22
7.2 Appliance mode of operation 22
7.3 Service paameters (5-42) 22
7.4 Adjusting the gas valve 22
7.5 1st digit status code 24
7.6 Temporary fault codes 24
7.7 Final fault codes 24
7.8 Diagnostic recall 24
7.9 Checking the expansion vessel 24
7.10 External faults (installation) 25
7.11 Electrical checks 25
7.12 Fault finding 25
Wiring diagrams Page
8.1 Installation of Vokera time clock 31
8.2 External controls important 31
Exploded diagrams Page
9.1 Table 1 36
9.2 Table 2 37
9.3 Table 3 38
9.4 Table 4 39
9.5 Table 5 40
L.P.G. instructions Page
10.1 Technical data 41
10.2 Related documents 41
10.3 Gas supply 41
10.4 Gas supply installation 41
10.5 Adjusting the gas valve 41

1
INTRODUCTION
General layout (fig. 1A)
1 Auto by-pass
2 Safety valve
3 Condense trap
4 Pump
5 Return sensor (NTC2)
6 Gas valve
7 Silicone pressure tube
8 Flow sensor (NTC1)
9 Auto air vent (AAV)
10 Flue outlet & air intake
11 Flue gas analysis test point
12 Burner plate
13 Expansion vessel
14 Spark/Sensing Electrode
15 Heat exchanger
16 Pressure switch
17 Fan assembly
18 Electronic Control Board (PCB)
R Heating return connection
F Heating flow connection
G Gas connection
The Pinnacle range of boilers are central heating
condensing boiler, which – by design – incorporates full
sequenceelectronic ignition,circulating pump,expansion
vessel, safety valve, pressure gauge and automatic by-
pass.
Pinnacleisproducedasaroomsealed,categoryC1,C3,
C6 appliance, suitable for wall mounting applications
only. Pinnacle is provided with a fan powered flue outlet
withanannularco-axialcombustionairintakethatcanbe
rotated – horizontally – through 360 degrees for various
horizontal or vertical applications. Pinnacle can also be
used with the Vokera twin flue system.
This appliance is designed primarily for use with sealed
systems;however itcan alsobe usedonanopenvented
system, provided that the necessary installation
requirements are met.
Fig. 1B
1
2
3
4
5
6
7
8
9
10
3
4
5
2
1
6
7
11
13
14
15
16
17
18
10
12
8
9
RF G
Control board (fig. 1B)
1 STEP button
2 PLUS button
3 MODE button
4 4 digits display
5 Status LED
6 RESET button
7 MINUS button
8 CH button/MEMO button
9 Time clock aperture
10 Pressure gauge
Fig. 1A

2
SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE
1.1 PRINCIPLE COMPONENTS
●A fully integrated electronic control board
featuring differential temperature control,
continuous air/gas modulation, anti-cycle
control, pump over-run, self-diagnostic fault
indicator, electronic ignition with flame
supervision & appliance frost protection
●Cast aluminium mono-block heat exchanger
●Low Nox burner with pre-mix
●Two-stage gas valve
●Pump
●Expansion vessel
●Pressure gauge
●Safety valve
1.2 MODE OF OPERATION (at rest)
Whenthereisnodemandforheatingorhotwater
andtheapplianceremainsinactiveforaperiodof
24 hours, the pump will be energised for a few
moments to prevent it from seizing. Should the
flowtemperaturesensorfallbelow7ºCthepump
will be energised. If the flow sensor temperature
falls to below 3 ºC the burner will be lit and the
appliancewilloperateattheminimumoutputuntil
thetemperatureoftheflowsensorreaches10ºC,
whereuponthepumpwillcontinuetoruninpump
over-run mode.
1.3 MODE OF OPERATON (heating or hot water
request)
Whenthereisarequestforheatviathetimeclock
and/or external controls, the pump will start and
the fan will be activated via the flow temperature
sensor. When the fan is sensed to be operating
correctly,theignitionsequencecommences.The
speed of the fan and therefore the output of the
boiler is determined by the temperature of the
water sensed by the flow & return temperature
sensors,consequentlya high temperatureat the
flow sensor results in a lower fan speed. As the
water temperature increases, the temperature
sensors – located on the flow and return pipes of
theboiler–reducethefanspeedviatheelectronic
circuitry.Depending ontheload, eitherthe water
temperaturewillcontinuetoriseuntilthesetpoint
is achieved or the water temperature will fall
whereby fan speed will increase relative to the
outputrequired.Whentheboilerhasreachedthe
set point, the burner will switch off. The built-in
anti-cycle device prevents the burner from re-
lighting for an adjustable period of time (factory
default is 3 minutes). When the temperature of
the flow sensor falls below the set-point, the
burner will re-light.
1.4 SAFETY DEVICES
When the appliance is in use, safe operation is
ensured by:
●a high limit thermostat that interrupts the
operation of the burner;
●adifferentialtemperatureprotectioncircuitwhich
interrupts the burner if the temperature
differential is inverted;
●a fan speed sensor that checks the correct
operation of the fan, thereby allowing safe
operation of the burner;
●a condense pressure switch that will stop the
burner from operating should the condense
trap become blocked;
●asafetyvalve whichreleases excess pressure
from the primary circuit.
Fig. 2
return flowgas
1
Heat
exchanger
Expansion
vessel
4
NTC1
(flow
sensor)
NTC2
(return
sensor)

3
SECTION 2 TECHNICAL DATA
Ref. Condition 15 °C, 1013,25 mbar, dry gas
NOTE: L.P.G. data refer to section 10
2.1 Central heating 16 26
Heat input (gross) 17.8 kW 29 kW
Maximum heat output 60/80°C (return & flow temperature) 15.4 kW 25.3 kW
Maximum heat output 30/50°C (return & flow temperature) 16.8 kW 26.8 kW
Minimum heat output 60/80°C (return & flow temperature) 4.4 kW 7.3 kW
Minimum heat output 30/50°C (return & flow temperature) 4.9 kW 8.1 kW
Minimum working pressure 0.5 bar 0.5 bar
Maximum working pressure 3 bar 3 bar
Minimum flow rate 350 litres per hour 350 litres per hour
2.2 Gas pressure
Inlet pressure (G20) 20.0 mbar 20.0 mbar
Maximum gas rate 1.69 m3/h 2.76 m3/h
Minimum gas rate 0.49 m3/h 0.80 m3/h
Injector size single injector with six 3.1 mm holes single injector with six 3.8 mm holes
2.3 Expansion vessel
Capacity 10 litres 10 litres
Maximum system volume 91 litres (approx.) 91 litres (approx.)
Pre-charge pressure 1.0 bar 1.0 bar
2.4 Dimensions
Height 820 mm 820 mm
Width 450 mm 450 mm
Depth 355 mm 355 mm
Dry weight 53 kg 53 kg
2.5 Clearances
Sides 12 mm 12 mm
Top 150 mm from casing or 25 mm above flue elbow (whichever is applicable)
Bottom 150 mm 150 mm
Front 600 mm 600 mm
2.6 Connections
Flow & return 22 mm compression 22 mm compression
Gas 15 mm compression 15 mm compression
Safety valve 15 mm compression 15 mm compression
2.7 Electrical
Voltage 230V/~ 50hz 230V/~ 50hz
Power consumption 130 W 130 W
Internal fuse F2A F2A
External fuse 3A 3A
2.8 Flue details
Maximum horizontal flue length (concentric) 10.0 metres 6.45metres
Maximum vertical flue length (concentric) 11.0 metres 7.45 metres
Maximum twin flue length (horizontal or vertical) 39 m/39 m + terminal 29 m/29 m + terminal
2.9 Efficiency
SEDBUK rating 90.3% (Band “A”) 90.3% (Band “A”)
2.10 Adjustable operating parameters
PARAMETER MINIMUM MAXIMUM FACTORY SETTING
P. 4 Central heating flow temperature 20 °C 90 °C 75 °C
P. 20 Pump over-run 10 seconds 99 m 10 m
P. 28 Anti-cycle delay 0 seconds 306 seconds 91.8 seconds
2.11 Emissions 16 26
NOxMin. output 20 ppm 15 ppm
NOxMax. output 40 ppm 30 ppm
CO Min. output 50 ppm 50 ppm
CO Max. output 50 ppm 50 ppm
CO2Min. output 9.8% 9.8%
CO2Max. output 9.8% 9.8%
CO/CO2ratio 0.0005 to 1 0.0005 to 1

4
2.12 PUMP DUTY
Fig.3showstheflowrateavailable–afterallowing
for pressure loss through the appliance – for
system requirements. When using this graph
apply only the pressure loss of the system. The
graphis basedon 20ºCtemperaturedifferential.
Fig. 4
Fig. 3
Water pressure (mH20)
Litres Per Hour
SECTION 3 GENERAL REQUIREMENTS (UK)
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
6,5
7
0 100 200 300 400 500 600 700 800 900 1000 1100 120
0
()
Key Location Minimum distance
A Below an opening (window, air-brik, etc.) 300 mm
B Above an opening (window, air-brik, etc.) 300 mm
C To the side of an opening (window, air-brik, etc.) 300 mm
D Below gutter, drain-pipe, etc. 75 mm
E Below eaves 200 mm
F Below balcony, car-port roof, etc. 200 mm
G To the side of a soil/drain-pipe, etc. 150 mm
H From internal/external corner or boundary 300 mm
I Above ground, roof, or balcony level 300 mm
J From a surface or boundary facing the terminal 600 mm
K From a terminal facing a terminal 1200 mm
L From an opening in the car-port into the building 1200 mm
M Vertically from a terminal on the same wall 1500 mm
N Horizontally from a terminal on the same wall 300 mm
P From a structure to the side of the vertical terminal 300 mm
Q From the top of the vertical terminal to the roof flashing As determined by the fixed collar
of the vertical terminal

5
This appliance must be installed by a competent
personinaccordancewiththeGasSafety(Instal-
lation & 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
building regulations, the current I.E.E. wiring
regulations, the bylaws of the local water
undertaking, the Building Standards (Scotland)
Regulation and Building Standards (Northern
Ireland) Regulations.
Itshouldbe inaccordance alsowithany relevant
requirementsofthelocalauthorityandtherelevant
recommendationsofthefollowingBritishStandard
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.
wiringregulations,and in Scotland,the electrical
provisions of the Building Regulations, with
respect to the installation of the appliance in a
roomorinternalspacecontainingabathorshower.
When an appliance is installed in a room or
internal space containing a bath or shower, the
appliance or any control pertaining to it must not
be within reach of a person using the bath or
shower.
Thelocationchosenfortheappliancemustpermit
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
circulation around the appliance.
Where the installation of the appliance will be in
an unusual location special procedures may be
necessary, BS 6798 gives detailed guidance on
this aspect.
A compartment used to enclose the appliance
must be designed and constructed specifically
for this purpose. An existing compartment/cup-
board may be utilised provided that it is modified
to suit.
Details of essential features of compartment/
cupboard design, including airing cupboard in-
stallations, 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
–mustbecheckedtoensurethatitisofadequate
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 soundness in
accordance with BS 6891.
Ifthegassupplyservesmorethanoneappliance,
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
Theterminalshouldbelocatedwherethedisper-
sal of combustion products is not impeded and
withdueregardforthedamageanddiscoloration
thatmayoccurtobuildingproductslocatednearby.
Theterminalmustnotbelocatedinaplacewhere
it is likely to cause a nuisance (fig. 4).
In a cold and/or humid water, water vapour may
condense on leaving the terminal; the effect of
such pluming must be considered.
If installed less than 2 metres above a pavement
orplatformtowhichpeoplehaveaccess(including
balconies or flat roofs) the terminal must be
protected by a guard of durable material. The
guard must be fitted centrally over the terminal.
Referto BS5440Part 1,when theterminalis 0,5
metres(orless)belowplasticguttering or1metre
(or less) below painted eaves.
3.5 AIR SUPPLY
The following notes are intended for general
guidance only.
Thisappliance isaroom sealed,fan-flued boiler,
consequentlyitdoes not requireapermanent air
vent for combustion air supply.
When installed in a cupboard or compartment,
ventilation for cooling purposes is also not
required.
3.6 WATER CIRCULATION
Detailedrecommendations aregiven inBS 5449
Part 1 and BS 6798. The following notes are for
general guidance only.
BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION
BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART 1 APPLICATION, SELECTION AND INSTALLATION OF EXPANSION VESSELS AND
ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

6
Fig. 5A
3.6.1 PIPEWORK
ItisrecommendedthatcoppertubingtoBS2871Part
1isused in conjunction withsoldered capillary joints.
Where possible pipes should have a gradient to
ensureairiscarriednaturallytoairreleasepoints
and that water flows naturally to drain cocks.
Exceptwhereprovidingusefulheat,pipesshould
beinsulatedtoavoidheatlossandinparticularto
avoid the possibility of freezing. Particular atten-
tion should be paid to pipes passing through
ventilated areas 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-
ternalby-pass,howeverthedesignofthesystem
should be such that it prevents boiler ‘cycling’.
3.6.3 DRAIN COCKS
These must be located in accessible positions to
facilitatedraining oftheappliance andall waterpipes
connectedtotheappliance.Thedraincocksmustbe
manufactured in accordance with BS 2879.
3.6.4 AIR RELEASE POINTS
Thesemustbepositionedatthehighestpointsin
thesystem whereair islikelytobetrapped. They
should be used to expel trapped air and allow
complete filling of the system.
3.6.5 EXPANSION VESSEL
Theappliancehasanintegral expansionvesselto
accommodatetheincreasedvolumeofwaterwhen
thesystemisheated.Itcanacceptupto10litresof
expansionfromwithinthesystem,generally thisis
sufficient, however if the system has an unusually
highwatercontent,itmaybe necessarytoprovide
additional expansion capacity.
3.6.6 FILLING POINT (fig. 5)
A method for initial filling of the system and
replacing water lost during servicing etc. has
beenprovided.Thismethodoffillingmustcomply
with the current Water Supply (Water Fittings)
Regulations 1999 and Water Bylaws 2000
(Scotland).Fig.5showsawidelyacceptedmethod.
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 (fig. 5A). The cold feed from the
make-up vessel or tank must be fitted with an
approved non-return valve and stopcock for iso-
lation purposes. The feed pipe should be con-
nected 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
aspects of the system are capable of withstand-
ing 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
completeisolationfromthesupply.Thepreferred
method is by using a double-pole switch with a
contact separation of at least 3 mm. The switch
must only supply the appliance and its
correspondingcontrols,i.e.timeclock,roomther-
mostat,etc.Alternativelyanun-switchedshuttered
socket with a fused 3-pin plug both complying
with BS 1363 is acceptable.
3.8 MOUNTING ON A COMBUSTIBLE SURFACE
Iftheapplianceistobefittedonawallofcombus-
tible material, a sheet of fireproof material must
protect the wall.
3.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building,itshouldbefittedinaccordancewiththe
Institute of Gas Engineers publication (IGE/UP/
7)“Guidefor Gas Installations inaTimber Frame
Buildings”.
3.10 CONDENSATE DISPOSAL
When choosing a location for the boiler,
consideration should be given to the disposal of
thecondensatedischargeintoa suitabledrainor
soil pipe. The condensate outlet pipe must be
connectedtothedraininaccordancewithbuilding
regulations or other rules in force.
3.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
usewithaluminium heatexchangers –isused to
protect the boiler and system from the effects of
corrosion and/or electrolytic action. The inhibitor
must be administered in strict accordance with
the manufacturers* instructions.
Make-up vessel
or tank
Automatic
air-vent
Non-return
valve Stopcock
5.0 metres minimum
Heating
return
Fig. 5
control valve
temporary
connection control valve
flow/return
pipe double check
valve supply pipe

7
*Fernox and Sentinel manufacture products that
have proved suitable for use with Vokera
appliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our
appliances.
Fig. 6
CH return
valve
CH flow
valve
Gas cock
Fig. 6A
CONDENSATE
TRAP
RETURN FLOW GAS

8
This appliance must be installed by a competent
person in accordance with and defined by, the
Standard Specification (Domestic Gas
Installations) Declaration (I.S. 813).
3A.1 RELATED DOCUMENTS
Theinstallationofthisboilermustbeinaccordance
withtherelevantrequirementsofthelocalbuilding
regulations, the current ETCI National Rules for
Electrical Installations, and the bylaws of the
local water undertaking.
Itshouldbe inaccordance alsowithany relevant
requirementsofthelocaland/ordistrictauthority.
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 forElectrical Installations,and I.S.
813, Annex K.
When an appliance is installed in a room or
internal space containing a bath or shower, the
appliance or any control pertaining to it must not
be within reach of a person using the bath or
shower.
Thelocationchosenfortheappliancemustpermit
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
circulation around the appliance. Where the
installation of the appliance will be in an unusual
location special procedures may be necessary,
refer to I.S. 813 for detailed guidance on this
aspect.
A compartment used to enclose the appliance
must be designed and constructed specifically
for this purpose. An existing compartment/
cupboard may be utilised provided that it is
modified to suit.
This appliance is not suitable for external
installation.
3A.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier
–mustbecheckedtoensurethatitisofadequate
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.
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
soundness in accordance with I.S. 813.
Ifthe gassupply servesmorethanoneappliance,
it must be ensured that an adequate supply is
maintained to each appliance when they are in
use at the same time.
3A.4 FLUE SYSTEM
Theterminalshouldbelocatedwherethedispersal
of combustion products is not impeded and with
dueregardforthedamageanddiscolorationthat
may occur to building products located nearby.
Theterminalmustnotbelocatedinaplacewhere
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
protected by a guard of durable material. The
guard must be fitted centrally over the terminal.
RefertoI.S.813,when theterminalis0.5metres
(or less) below plastic guttering or 1 metre (or
less) below painted eaves.
3A.5 AIR SUPPLY
The following notes are intended for general
guidance only.
Thisapplianceisaroom-sealed,fan-fluedboiler,
consequentlyitdoes not requireapermanent air
vent for combustion air supply.
When installed in a cupboard or compartment,
ventilation for cooling purposes is also not
required.
3A.6 WATER CIRCULATION
Specific recommendations are given in I.S. 813.
The following notes are for general guidance
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.
Exceptwhereprovidingusefulheat,pipesshould
beinsulatedtoavoidheatlossandinparticularto
avoidthepossibilityoffreezing.Particularattention
shouldbepaidtopipespassingthroughventilated
areas such as under floors, 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
external by-pass, however the design of the
system should be such that it prevents boiler
‘cycling.
3A.6.3 DRAIN COCKS
Thesemustbe located inaccessiblepositions to
facilitate draining of the appliance and all water
pipes connected to the appliance.
SECTION 3A GENERAL REQUIREMENTS (EIRE)

9
3A.6.4 AIR RELEASE POINTS
Thesemustbepositionedatthehighestpointsin
thesystem whereair islikelytobetrapped. 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
whenthesystemisheated.Itcanacceptupto10
litres of expansion from within the system,
generally this is sufficient, however if the system
has an unusually high water content, it may be
necessary to provide additional expansion
capacity.
3A.6.6 FILLING POINT
A method for initial filling of the system and
replacingwaterlostduring servicingetc.mustbe
provided. A typical arrangement is shown in
figure5. Youshould ensurethismethod offilling
complieswiththelocalwaterauthorityregulations.
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 (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
indicative of a leak. Care should be taken during
the installation of the appliance to ensure all
aspectsofthesystemarecapableofwithstanding
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
completeisolationfromthesupply.Thepreferred
method is by using a double-pole switch with a
contact separation of at least 3 mm. The switch
must only supply the appliance and its
corresponding controls, i.e. time clock, room
thermostat, etc.
3A.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of
combustiblematerial,asheetoffireproofmaterial
must protect the wall.
3A.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building,itshouldbefittedinaccordancewithI.S.
813 and local Building Regulations.
The Institute of Gas Engineers publication (IGE/
UP/7)‘GuideforGasInstallationsinTimberFrame
Buildings’ gives specific advice on this type of
installation.
3A.10 CONDENSATE DISPOSAL
When choosing a location for the boiler,
consideration should be given to the disposal of
the condensate discharge into a suitable drain
or soil pipe. The condensate outlet pipe must be
connected to the drain in accordance with
building regulations or other rules in force.
3A.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
use with aluminium heat exchangers – is used
to protect the boiler and system from the effects
of corrosion and/or electrolytic action. The
inhibitor must be administered in strict
accordancewith themanufacturers*instructions.
*Fernox and Sentinel manufacture products that
have proved suitable for use with Vokera
appliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our
appliances.
3A.12 DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S.
813) must be provided on completion of the
installation.
A copy of the declaration must be given to the
responsible person and also to the gas supplier
if required.

10
SECTION 4 INSTALLATION
4.1 DELIVERY
Due to the weight of the appliance it may be
necessary for two people to lift and attach the
appliance to its mounting. The appliance is
contained within a heavy-duty cardboard carton.
Lay the carton on the floor with the writing the
correct way up.
4.2 CONTENTS
Contained within the carton is:
●the boiler;
●the wall bracket;
●template;
●an accessories pack containing appliance
service 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
At the top of the carton pull both sides open – do
notuseaknife–unfoldtherestofthecartonfrom
around the appliance, carefully remove all
protectivepackaging fromthe appliance,and lay
theaccessoriesetc.tooneside.Protectivegloves
shouldbeusedtolifttheappliance,theappliance
back-frame should be used for lifting points.
4.4 PREPARATION FOR MOUNTING THE
APPLIANCE
The appliance should be mounted on a smooth,
vertical,non-combustiblesurface,whichmustbe
capable of supporting the full weight of the
appliance. Care should be exercised when
determining the position of the appliance with
respect to hidden obstructions such as pipes,
cables, etc.
When the position of the appliance has been
decided–usingthetemplatesupplied–carefully
mark the position of the wall- mounting bracket
(fig. 6A) and flue-hole (if applicable).
4.5 FITTING THE FLUE
The top flue outlet permits both horizontal and
vertical flue applications to be considered,
alternatively, the Vokera twin flue system can be
utilised if longer flue runs are required.
4.5.1 CONCENTRIC HORIZONTAL FLUE
(For concentric vertical flue, see section 4.5.2).
(For twin flue applications, see section 4.5.3).
The appliance flue outlet elbow can be rotated
through 360º on its vertical axis. In addition the
fluemaybeextendedfromtheoutletelbowinthe
horizontal plane (see section 2.9). A reduction
must also be made to the maximum length (see
table below) when additional bends are used.
Using the template provided (fig. 6A), mark and
drill a 125 mm hole for the passage of the flue
pipe. The hole should have a 1º rise from the
boiler to outside.
The fixing holes for the wall-mounting bracket
shouldnowbedrilledandplugged,anappropriate
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.
FITTING THE HORIZONTAL FLUE KIT
Using a twisting motion, connect the boiler top
adaptor – supplied with the flue terminal kit – to
theappliance flueoutletensuring themale spigot
of the adaptor is pushed fully into the flue outlet
spigotofthe boiler(fig.7). Carefullymeasurethe
distance from the centre of the appliance flue
outlet to the edge of the finished outside wall
(dimension X). Add 45 mm to dimension Xto
give you Dimension Y(fig 7A). Measure
dimension Yfrom the terminal end of the
concentric flue pipe and cut off the excess. Pass
the concentric flue pipe through the previously
drilled hole. Fit the flue bend to the boiler top
Reduction for additional bends
Bend Reductioninmaximumfluelengthforeachbend
45°bend
90°bend 0.5 metre
1.0 metre
Horizontal flue terminals and accessories
Part No. Description Min-Max length
0225720
0225755
0225740
0225745
0225750
0225730
0225735
0225760
Horizontal flue kit for use with
add. bends & extensions
Telescopic extension
0.5 m extension
1.0 m extension
2.0 m extension
45°bend (pair)
90°bend
Wall bracket (5)
1000 mm
350mm-500mm
500 mm
1000 mm
2000 mm
N/A
N/A
N/A
Push-fit
connection
Horizontal
terminal or
extension
Boiler
Boiler top
adaptor
Fig. 7

11
adaptor and insert the concentric flue pipe into
the flue bend ensuring the correct seal is made.
Using the clamp, gasket and screws supplied,
securetheflue bend to theapplianceflue spigot.
NOTE
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 will provide
satisfactory weatherproofing. The interior and
exterior trim can now be fitted.
4.5.1.1 EXTENDING THE FLUE
Connectthebend –supplied withtheterminal kit
– to the top of the boiler using the boiler top
adapterandclamp(supplied,fig.7).Theadditional
bends & extensions have push-fit connections,
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 the flue terminal (fig. 7 & 7B).
Fig. 7A
NOTE
Whencuttinganextensiontotherequiredlength,
you must ensure that the excess is cut from the
plain end of the extension (fig. 7 & 7B). Remove
any burrs, and check that all 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
or a suitable alternative that will provide
satisfactory weatherproofing. The interior and
exterior trim can now be fitted.
4.5.2 CONCENTRIC VERTICAL FLUE
Theverticalflueterminalcanbeconnecteddirectly
to the appliance flue outlet. Alternatively, an
extension or bend can be connected to the
appliance flue outlet if desired (see section 2.9),
howeverifadditionalbendsarefitted,areduction
must be made to the maximum flue length (see
table below).
Reduction for bends
Bend Reductioninmaximum flue length foreachbend
45°bend
90°bend
0.5 metre
1.0 metre
Vertical flue terminal and accessories
PartNo. Description Min-Max length
0225725
0225770
0225765
0225755
0225740
0225745
0225750
0225730
0225735
0225760
Vertical flue terminal
Pitched roof flashing plate
Flat roof flashing plate
350-500 telescopic extension
500 mm extension
1000 mm extension
2000 mm extension
45°bend (pair)
90°bend
Wall bracket (4)
1000 mm
N/A
N/A
350mm-500mm
500 mm
1000 mm
2000 mm
N/A
N/A
N/A
Fig. 8
520mm
300mmminimum
170mm
Fig. 7B
“Y” = “X” + 45 mm
Boiler
Extension pipe
Boiler top adaptor
Push-fit connection
Plain end

12
Usingthedimensionsgiveninfig.8asareference,
mark and cut a 105 mm hole in the ceiling and/or
roof.
IMPORTANT
You must ensure that the terminal is at least 300
mm from any structure or surface (fig. 8).
The vertical flue terminal is 1.0 metre in length
andcannotbe cut;thereforeit maybenecessary
toadjust theheightoftheappliancetosuit oruse
a suitable extension. Ensure that any horizontal
sections of the flue system have a 1º fall back to
the boiler (17 mm per 1000 mm).
Fit the appropriate flashing plate to the roof and
inserttheverticalflueterminalthroughtheflashing
platefromthe outside,ensuringthat thecollaron
the flue terminal fits over the flashing.
The fixing holes for the wall-mounting bracket
shouldnowbedrilledandplugged,anappropriate
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.
Secure the vertical flue terminal or intermediate
fluecomponent, totheapplianceusingthe boiler
top adaptor and 100 mm clamp supplied.
NOTE
Whencuttinganextensiontotherequiredlength,
you must ensure that the excess is cut from the
plain end of the extension. Remove any burrs,
and check that any seals are located properly.
4.5.3 TWIN FLUE SYSTEM
TheVokeratwin fluesystem enables greaterflue
distances to be achieved (see section 2.9) than
thatof the standardconcentric fluesystem. It can
be used for horizontal or vertical applications,
however the twin flue system must be converted
tothe dedicatedconcentric fluekitfortermination.
It is essential that the installation of the twin flue
system be carried out in strict accordance with
these instructions.
GUIDANCE NOTES ON TWIN FLUE
INSTALLATION
●The flue must have a fall back of 1º back to the
appliance to allow any condensate that forms
intheflue systemto drain. Consideration must
also be given to the fact that there is the
possibility of a small amount of condensate
dripping from the terminal.
●Ensurethat theentire fluesystem isadequately
supported, use at least one bracket for each
extension.
●Extreme care must be taken to ensure that no
debris is allowed to enter the flue system at
any time.
●As the exhaust outlet pipe can reach very high
temperatures it must be protected to prevent
persons touching the hot surface.
MOUNTING THE BOILER
The fixing holes for the wall-mounting bracket
should now 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.
4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (fig. 9)
●Insertthe exhaustconnection manifold(B)onto
the appliance flue outlet and secure to the flue
spigot using the screws provided.
●Remove the blanking plates (located to the left
of the appliance flue outlet) and – using the
same screws – install the air baffle (A).
4.5.3.2 HORIZONTAL TERMINATION (fig. 10)
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 130 mm hole is required for the passage of
the concentric terminal through the wall.
Dependingon siteconditions itmay bepreferable
to install the terminal assembly prior to fitting the
twin flue pipes.
Mark and drill a 130 mm hole for the passage of
the horizontal flue terminal, ensuring that there is
a 1°fall back to the boiler (17 mm per 1000 mm).
Insert the terminal assembly into the flue hole.
Push-fitthetwin flue pipes ontotheconcentric to
twinconverter boxensuringthat theexhaust pipe
Reductioninmaximum flue length foreachbend
Reduction for bends
Bend
45°bend
90°bend 1.0 metre
1.0 metre
Twin flue accessories
Part No. Description Length
0225805
0225810
359
0225770
0225765
0225815
0225820
0225825
0225830
0225835
0225840
0225845
0225850
0225855
Horizontal flue terminal
Vertical flue terminal
Twin adapter kit
Pitched roof flashing plate
Flat roof flashing plate
Condensate drain kit
0.25 m extension (pair)
0.5 m extension (pair)
1.0 m extension (pair)
2.0 m extension (pair)
45°bend (pair)
90°bend (pair)
Twin bracket (5)
Single bracket (5)
1000 mm
1000 mm
N/A
N/A
N/A
N/A
250 mm
500 mm
1000 mm
2000 mm
N/A
N/A
N/A
N/A
Fig. 9
B
A

13
connects to the exhaust connection on the
concentric to twin converter.
If necessary cut the plain ends (male) of the twin
flue pipes to allow connection to the concentric
to twin converter.
NOTE
Before cutting twin flue pipes ensure allowances
havebeen madefor connectiononto theprevious
piece and onto the concentric to twin converter.
The last twin flue pipes must be pushed 50 mm
onto the male spigots of the concentric to twin
converter.
NOTE
You must ensure that the entire flue system is
properly supported and connected.
Whencutting anextensionto therequired length,
you should ensure that the excess is cut from
theplain endofthe extension.Remove anyburrs
and check that both seals are located properly.
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.
4.5.3.3 VERTICAL TERMINATION (fig. 11)
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 130 mm hole is required for the passage of
theconcentricterminal throughthe ceilingand/
or roof.
Dependingon siteconditions itmay bepreferable
to install the terminal assembly prior to fitting the
twin flue pipes.
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.
Push-fitthetwin flue pipes ontotheconcentric 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 twin
flue pipes to allow connection to the concentric
to twin converter.
NOTE
●Before cutting twin flue pipes ensure
allowances have been made for connection
ontothe previouspiece andonto theconcentric
to twin converter. The last twin flue pipes must
be pushed 50 mm onto the male spigots of the
concentric to twin converter.
●You must ensure that the entire flue system is
properly supported and connected.
●Ensure that any horizontal sections of pipe
have a 1°fall towards the appliance (17 mm
per 1000mm).
convertor box
Fig. 11
convertor box
●The convertor box on the vertical terminal will
haveto betemporarilyremoved wheninserting
the terminal through the flashing.
4.6 CONNECTING THE GAS AND WATER
Care must be taken to ensure that the appliance
and/or its ancillary components are protected
from the use of a blowtorch or similar soldering
equipment. The appliance is supplied with
accessories that include sealing washers and
service valves and connections.
Whenconnectingpipeworktothevalves,tighten
the compression end first then insert the sealing
washers before tightening the valve to the
appliance.
NOTE
It will be necessary to hold the valve with one
spanner whilst tightening with another.
4.6.1 GAS (fig. 6 & 6A)
The appliance is supplied with a 15 mm service
valve, connect the supply pipe to the inlet of the
valve and tighten the connecting nut.
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 & 6A)
The appliance is supplied with 22 mm service
valvesfortheflowandreturnconnections,connect
a22mmpipetotheinletofeachvalveandtighten
both nuts.
4.6.3 SAFETY VALVE
Connect the safety valve discharge pipe to the
safety valve outlet and tighten.The discharge
pipe must have a continuous fall away from the
applianceto outsideand allowanywatertodrain
awaytherebyeliminatingthepossibilityoffreezing.
The discharge pipe must terminate in a position
where any water - possibly boiling - discharges
safely without causing damage or injury, but is
still visible.
4.7 CONDENSATE OUTLET (fig. 6A)
During normal operation the boiler produces
condensatewhichis collectedina traplocatedin
the lower part of the boiler. A flexible pipe
Fig. 10

14
(condensate outlet pipe) is connected to the
outlet of the trap. The flexible pipe must be
connected to a plastic waste pipe only. The
plastic waste pipe must have a minimum of a 3º
fall towards the drain. Any external run of pipe
shouldbeinsulatedtopreventtheriskoffreezing.
CONNECTING THE CONDENSATE OUTLET
Gentlypullthecondensateoutletpipedownfrom
its location inside the boiler until approximately
250 mm protrudes from the underside of the
boiler. Connect a suitable plastic (not copper)
pipe (no less than 20 mm diameter) to the outlet
pipeandensureitdischargesinaccordancewith
building regulations or other rules in force.
4.8 AUTOMATIC AIR RELEASE VALVE
Mount the AAV as shown in fig. 12.
4.9 ELECTRICAL CONNECTIONS
The electrical supply must be as specified in
section 3. A qualified electrician should connect
the electrical supply to the appliance. If controls
– external to the appliance – are required, a
competent person must undertake the design of
any external electrical circuits, please refer to
section 8 for detailed instructions.
ANYEXTERNALCONTROLORWIRINGMUST
BE SERVED FROM THE SAME ISOLATOR AS
THAT OF THE APPLIANCE.
Thesupplycablefromtheisolatortotheappliance
must be 3-core flexible sized 0.75 mm to BS
6500. Wiring to the appliance must be rated for
operation in contact with surfaces up to 90 ºC.
4.9.1 ELECTRICAL INPUT BOARD
The appliance electrical input board is located
behind the control fascia.
To gain access to the appliance electrical
connections you must proceed as follows:
●push to release front door panel and lower to
reveal controls. Loosen the 2 captive screws
securingthefrontcontrolpaneltothelowerpart
of the casing and lower to reveal inside of the
boiler (fig. 13A);
●remove the 4 screws securing the input board
cover (fig. 13B).
NOTE
The appliance comes with a factory fitted link to
allowbasicoperationoftheboilerviathekeypad.
If it is anticipated that external controls will be
required please refer to the wiring diagrams in
section 8 for more detailed information.
4.9.2 CONNECTING THE MAINS (230V) INPUT
(fig. 14)
Remove the electrical input board cover as
describedinsection4.9.1.Passthecablethrough
the cable anchorage. Connect the supply cable
wires (earth, live and neutral) to their
corresponding terminals on the electrical input
board.Ensure thatthe EARTHwire isleftslightly
longer that the others, this will prevent strain on
the EARTH wire should the cable become taut.
Donotremove thelinkwire (betweenterminals2
&3onplugM7)unlessadditionalexternalcontrols
aretobefitted(seesection8).Re-fittheelectrical
input board cover.
The securing screw on the cable anchorage
should now be tightened. This must be done
before the control fascia is re-fitted in the upright
position.
Fig. 13A
screws
Fig. 13B
Fig. 12
Fig. 14

15
Fig. 15
4.10 CASING REMOVAL
Lower the front control panel as described in
section 4.9.1.
●Locate and remove the 2 screws that secure
the controls fascia to the appliance casing (fig.
13A)
●locateandremovethe2screwsthatsecurethe
casing to the back frame of the boiler (fig. 15)
●gentlypullonesideofthecasingthentheother
to disengage it from the retaining clips
●lift the casing upward to disengage it from the
top locating hooks and then remove
●storethecasingandscrewssafelyuntilrequired.
Re-fit in the reverse order.
screw screw

16
Parameter Description Range
1
2
3
4
N/A
N/A
Heating mode
Heating outlet temperature
N/A
N/A
00 = off
01 = on
03 = off
(pump on continuously)
04 = on
(pump on continuously)
20 °C - 90 °C
5.1 GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for soundness and purge.
5.2 THE HEATING SYSTEM
The appliance contains components that may
becomedamagedorrenderedinoperablebyoils
and/ordebristhatareresidualfromtheinstallation
ofthesystem,consequentlyitisessentialthatthe
systembeflushedinaccordancewiththefollowing
instructions.
5.3 INITIAL FILLING OF THE SYSTEM
5.3.1. Ensure both flow and return service valves are
open,identifytheautomaticairreleasevalve(fig.
12) and loosen the dust cap by turning the cap
anti-clockwise one full turn.
5.3.2. IMPORTANT, THERE ARE NO MANUAL AIR
RELEASE VALVES LOCATED ON THE
APPLIANCE.Ensureallmanualairreleasevalves
located on the heating system are closed.
5.3.3. Using the method of filling as described in fig. 5,
slowlyproceedto fillthe system. Aswater enters
the system the pressure gauge will begin to rise.
Once the gauge has reached 1 bar close the
filling valve and begin venting all manual air
release valves, starting at the lowest first. It may
benecessarytogobackandtop-upthepressure
untiltheentiresystemhasbeenfilled.Inspectthe
systemforwatersoundness,rectifyinganyleaks.
5.4 INITIAL FLUSHING OF THE SYSTEM
Thewholeoftheheatingsystemmustbeflushed
bothcoldandhotasdetailedinsection5.8.Open
all radiator or heating valves and the appliance
flow & return service valves. Drain the boiler and
system from the lowest points. Open the drain
valve full bore to remove any installation debris
from the boiler prior to lighting. Refill the boiler
and heating system as described in section 5.3.
5.5 PRE-OPERATION CHECKS
Beforeattemptingtheinitiallightingoftheappliance,
the following checks must be carried out:
●ensureallgas service valvesfromthe meter to
theapplianceareopenandthesupplypipehas
been properly purged;
●ensure the proper electrical checks have been
carried out, (see section 7.7) particularly
continuity, polarity, and resistance to earth;
●ensure the 3 amp fuse – supplied with the
appliance – has been fitted;
●ensurethe systemhas beenfilled, vented,and
the pressure set to 1 bar;
●ensurethefluesystemhasbeenfittedproperly
and in accordance with the instructions;
●ensure all appliance service valves are open.
5.6 INITIAL LIGHTING
Ensure the electrical supply to the appliance is
switchedon. Switchthetimeclockorprogrammer
toan‘on’positionandensureallexternalcontrols
are also calling for heat.
The appliance will operate in the central heating
mode as described in section 1.3. Should the
appliancefailto ignite,refer tosection5.6 and/or
section 7 (faultfinding).
5.7 FINALFLUSHINGOF THE HEATINGSYSTEM
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
administered in strict accordance with the
manufacturers instructions.
*BothSentinelandFernoxmanufactureproducts
that have proved suitable for use with Vokera
appliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our
appliances.
5.8 INHIBITORS
See Section 3 “General Requirements”.
5.9 APPLIANCE OPERATING PARAMETERS
The appliance is supplied with pre-set operating
parameters.Parameters3&4canbeadjustedat
anytime,howevertheremainingparameters(5–
42) can only be accessed after entering the
relevantservicecode,andshouldonlybeadjusted
by qualified service personnel.
5.10 PARAMETERS 3 & 4
Parameters 3 & 4, are used to alter or adjust the
operating mode and flow temperature. Use the
following table and procedure to check or adjust
the relevant parameters:
●Pressthe
mode
buttonuntil“PARA”appears
in the display.
●Press the
S
button until the appropriate
parameter is shown in the left side of the
display.
●Usethe
+
or
-
buttonstoadjustthevalue
of the paramater as shown in the right side of
the display.
●Press the
M
button to store the new setting.
●Press the
reset
button to return to the
stand-by mode.
IMPORTANT
Under no circumstances should any parameters
- other than those shown above - be changed or
adjusted by non competent personnel.
5.11 INFORMATION MODE
The appliance keypad can be used to display
certain information on the working status of the
boiler. Information such as flow & return
temperature,andtemperaturerisecanbeviewed
using the following table and procedure:
SECTION 5 COMMISSIONING

17
●Pressthe
mode
buttonuntil“INFO”appears
in the display.
●Pressthe
S
buttonuntiltheappropriate step
number is shown in the left side of the display.
●The measured value of each step is shown on
the right side of the display.
●Press the
mode
button until “Stby” appears
in the display to return to the stand-by mode.
5.12 SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 1
bar and a maximum of 1,5 bar.
Theactualreading shouldideallybe 1barplus
the equivalent height in metres (0,1 bar = 1
metre)tothehighestpointinthesystemabove
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,pullleveronheadofsafetyvalvetorelease
water until the required figure registers on the
pressure gauge (fig. 1).
5.13 REGULATING THE CENTRAL HEATING
SYSTEM
Fully open all radiator and circuit valves and run
theappliance forboth heatingandhotwateruntil
heatedwateriscirculating.Ifconditionsarewarm
remove any thermostatic heads. Adjust radiator
returnvalvesandanybranchcircuitreturnvalves
untiltheindividualreturntemperaturesarecorrect
and are approximately equal.
5.14 CHECKING DYNAMIC GAS PRESSURE
Isolate the appliance from the electrical supply
andremovetheappliancecasingasdescribedin
section 4.10. Unclip and remove the front air
chamber cover.
Attach a suitable manometer to the inlet test
nipple of the gas valve.
Restore the electrical supply to the boiler and
generate a request for central heating via the
room thermostat and/or timer.
Pressthe
mode
and
+
buttonsatthesame
time, the boiler will now run at full power for 15
minutes.
The dynamic gas pressure will now be shown on
themanometer,andshouldbe20mbar+/-1mbar.
If the dynamic gas pressure is out-with the
tolerance range, you should contact the gas
supplier for advice.
Press the
+
and
-
buttons at the same
time to return to the normal operating mode.
Isolate the appliance from the electrical supply,
removethe manometerfromthe inlettest nipple,
tighten the test nipple screw, and check for
soundness.
Refittheairchambercoverandappliancecasing
in the reverse order.
5.15 FINAL CHECKS
●ENSURE ALL TEST NIPPLES ON THE
APPLIANCE GAS VALVE ARE TIGHT AND
HAVE BEEN CHECKED FOR SOUNDNESS.
●ENSURETHEAPPLIANCEFLUESYSTEMIS
FITTED CORRECTLY AND IS PROPERLY
SECURED.
●ENSURE ALL PIPE WORK IS RE-CHECKED
FOR SOUNDNESS.
●RE-FIT APPLIANCE CASING.
●COMPLETE APPLIANCE LOGBOOK.
Completedetailsoftheboiler,controls,installation
and commissioning in the logbook supplied with
the boiler. This is an important document, which
must be correctly completed and handed to the
user. Failure to install and commission the
appliance to the manufacturers instructions may
invalidate the warranty.
5.16 INSTRUCTING THE USER
Hand over all documentation supplied with this
appliance – including these instructions – and
explaintheimportance of keeping themina safe
place.
Explain to the user how to isolate the appliance
from the gas, water and electricity supplies, and
the locations of all drain points.
Show the user how to operate the appliance and
its associated controls correctly.
Showthe userthe locationofthefillingvalveand
how to top-up the system pressure correctly and
showthelocationofallmanualairreleasepoints.
Explain to the user how to turn off the appliance
forbothlongandshort periodsandadviseonthe
necessary precautions to prevent frost damage.
Step number Information displayed
1
2
3
4
5
6
7
8
9
A
Temperature at flow sensor
Temperature at return sensor
Unused
Unused
Unused
Required temperature (as set at parameter 4)
Temperatureriseofflowsensor(measuredin°Cper
second)
Temperature rise of return sensor (measured in °C
per second)
Unused
Unused

18
SECTION 6 SERVICING INSTRUCTIONS
6.1 GENERAL
To ensure the continued safe and efficient
operation of the appliance, it is recommended
thatitischeckedandservicedatregularintervals.
The frequency of servicing will depend upon the
particular installation conditions, but in general,
once per year should be adequate.
It is the law that any servicing work is carried out
bycompetentpersonsuchasaVokeraengineer,
an approved service agent, British Gas or other
CORGI registered personnel.
The following instructions apply to the appliance
andits controls,but itshould berememberedthat
the central heating system will also require
attention from time to time.
6.2 ROUTINE ANNUAL SERVICING
●Checktheoperationoftheapplianceandensure
it functions as described in section 7.
●Compare the performance of the appliance
with its design specification. The cause of any
noticeable deterioration should be identified
and rectified without delay.
●Thoroughly inspect the appliance for signs of
damage or deterioration especially the flue
system and the electrical apparatus.
●Check and adjust – if necessary – the system
design pressure (see section 5.12).
●Ensureboththeburnerandheatexchangerare
clean and free from any debris or obstruction.
●Carry out an analysis of the flue gases (see
section7.4),andvisuallychecktheconditionof
the entire flue assembly.
●Compare the results with the appliance design
specification.Anydeteriorationinperformance
must be identified and rectified without delay.
●Inspectalljointsforsignsofleakageandrepair
if necessary.
●Refer to the commissioning section and/or
replacement of parts section for detailed
instruction if required.
6.3 REPLACEMENT OF COMPONENTS
Although it is anticipated that this appliance will
giveyearsofreliable,troublefreeservice,thelife
spanofcomponentswillbedeterminedbyfactors
such as operating conditions and usage. Should
the appliance develop a fault, the fault finding
sectionwillassistindeterminingwhichcomponent
is malfunctioning. Always use genuine Vokera
spare parts.
6.4 COMPONENT REMOVAL PROCEDURE
Toremoveacomponent,accesstotheinteriorof
the appliance is essential. Isolate the appliance
from the electrical supply and remove the fuse.
And when necessary, close all service valves on
the appliance, remove the appliance casing as
describedinsection4.10.Drainthewatercontent
from the appliance via the safety valve. Ensure
some water absorbent cloths are available to
catch any residual water that may drip from the
appliance or removed component. Undertake a
complete commissioning check as detailed in
section 5, after replacing any component.
ALWAYS TEST FOR GAS SOUNDNESS IF
ANY GAS CARRYING COMPONENTS HAVE
BEEN REMOVED OR DISTURBED.
6.5 PUMP HEAD (fig. 1)
Carry out component removal procedure as
described in section 6.4.
Using a 4 mm Allen key or ‘T’ bar, unscrew and
remove the four Allen screws that hold the pump
inposition,pullfirmlyonthepumpheadtorelease
it from the base. Disconnect the electrical leads.
Replace in the reverse order.
6.6 SAFETY VALVE (fig. 16)
Carry out component removal procedure as
described in section 6.4.
Disconnect the outlet pipe from the safety valve.
Remove safety valve locking screw from the
underside of the appliance manifold. Pull safety
valve free from manifold.
Replace in the reverse order.
6.7 AUTOMATIC AIR RELEASE VALVE (fig. 12)
Carry out component removal procedure as de-
scribed in section 6.4. Using a suitable pair of
pump pliers, unscrew the AAV from its position.
Replace in the reverse order.
6.8 PRESSURE GAUGE (fig. 17)
Carry out component removal procedure as de-
scribed in section 6.4.
Remove pressure gauge locking screw, located
on manifold, and withdraw the pressure gauge
pipe, locate the spring tabs on the pressure
gauge body, push and hold tabs in, to enable
extraction of the gauge from its location.
Replace in the reverse order.
Fig. 16
Safety valve
Locking screw
Fig. 17
Pressure gauge
connection
Locking screw
Manifold