VOKERA Syntesi e Release note

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Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

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Contents
Design principles and operating sequence Page
1.1 Principle components 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 Optional accessories 2
Technical data Page
2.1 Central heating 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 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 6
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 Frequent filling 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 Related documents 7
3.A2 Location of appliance 7
3.A3 Gas supply 7
3.A4 Flue system 7
3.A5 Air supply 7
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 Frequent filling 8
3.A7 Electrical supply 8
3.A8 Showers 8
3.A9 Mounting on a combustible surface 8
3.A10 Timber framed building 8
3.A11 Inhibitors 8
3.A12 Declaration of conformity 8
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 14
4.6.5 Safetyvalve 14
4.6.6 Condense pipe 15
4.7 Electrical connections 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 Initial flushing 17
5.5 Filling the hot water system 17
5.6 Pre-operation checks 17
5.7 Initial lighting 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 18
5.13 Instructing the user 19
Servicing instructions Page
6.1 General 19
6.2 Routine annual servicing 19
6.3 Replacement of components 19
6.4 Component removal procedure 19
6.5 Pump assembly 19
6.6 Safetyvalve 20
6.7 Automatic air release valve 20
6.8 Water pressure switch 20
6.9 Pressure gauge 20
6.10 Primary thermistors 20
6.11 High limit thermostat 21
6.12 Printed circuit board 21
6.13 Gas valve 21
6.14 Integral time switch 22
6.15 Electrode, burner thermostat, burner & injectors 22
6.16 Flue fan 23
6.17 Main heat exchanger 23
6.18 Air pressure switch 24
6.19 Flow restrictor 24
6.20 DHW flow switch 24
6.21 DHW heat exchanger 24
6.22 Valve actuator 24
6.23 Divertor valve assembly 24
6.24 Secondary thermistor 25
6.25 Automatic by-pass 25
6.26 DHW non-return valve 25
6.27 Expansion vessel 25
6.27.1 Expansion vessel removal 25
6.27.2 Expansion vessel removal 25
6.28 Latent heat collector 26
6.28A Dismantling the latent heat collector 26
6.29 Condense trap removal 26
Checks, adjustments and fault finding page
7.1 Checking appliance 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 Appliance functions 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 28
7.5 Checking the expansion vessel 29
7.6 External faults 29
7.6.1 Installation faults 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 29
7.7.5 Resistance to earth check 30
7.8 Fault finding 30
7.9 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 Other controls 39
Exploded diagrams Page
Table 1 - 5 43 - 48
L.P.G. instructions Page
10.1 Related documents 49
10.2 Technical data 49
10.3 Converting the appliance gas type 49
10.4 Gas supply 49
10.5 Gas supply installation 49
10.6 Checking and adjusting burner pressure 49
10.6.1 Setting the maximum burner pressure 49
10.6.2 Setting the minimum burner pressure 49

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TheSyntesirangeofappliancesiscomprisedof3models
of high-efficiency combination boiler with outputs to
heating & DHW of 24, 28, & 34kW respectively. Each
appliance – by design – incorporates electronic ignition,
circulatingpump,expansionvessel,safetyvalve, pressure
gauge, and automatic by-pass.
TheSyntesi range isproduced as roomsealed, category
II2H3+ appliances, suitable for internal wall mounting
applications only. They are provided with a fan powered
flue outlet with an annular co-axial combustion air intake
INTRODUCTION
that can be rotated – horizontally – through 360 degrees
forvarioushorizontalor vertical applications. The Syntesi
rangecan also beused with theVokera twin fluesystem.
The Syntesi range is approved for use with C12 & 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
Fig.1 General Layout
1 SafetyValve
2 Pressure Switch
3 Diverter Valve Motor
4 Domestic Heat Exchanger
5 Pump
6 AutomaticAir Release Valve
7 Main Burner
8 Electrode
9 Main Heat Exchanger
10 Latent Heat Collector
11 Condense Sensor
12 Flue GasAnalysis Test Point
13 Flue Outlet
14 Air Intake
15 Differential Analog Pressure Switch
16 Silicone PressureTube
17 Silicone Negative PressureTube
18 FanAssembly
19 Combustion Chamber
20 Burner Temperature Control
21 ExpansionVessel
22 Transformer
23 GasValve
24 Modulator Coil
25 CondenseTrap
26 Domestic Hot Water Flow Switch
27 Hot Water Temperature Control
28 Mode Selector Switch
29 Status LED
30 Temperature Indicator
31 DHW Request LED
32 Central Heating Temperature Control
33 Combustion Switch
34 Timeclock Aperture (optional)
35 Pressure Gauge
6
9
11 12 13 14
19
22
24
15
16
17
23
18
1
2
3
4
5
7
8
10
20
21
25
26
35 34 33
27 28 30 3129 32

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1.1 PRINCIPLE COMPONENTS
●A fully integrated electronic control board
featuring electronic temperature control, anti-
cycle control, pump over-run, self-diagnostic
fault 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
●Safetyvalve
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-
blestheappliancetoperiodicallylightandmain-
tain the temperature of the DHW heat ex-
changer. This “keep-hot” facility enables the
appliance to provide an instantaneous re-
sponse to DHW requests.
●2-stagefrost-protection system –the frost-pro-
tection system protects the appliance against
the risk of frost damage. The first stage ena-
blesactivationofthepumpshouldthetempera-
ture of the appliance fall to 7°C. The second
stage becomes active when the temperature
has dropped to 3°C. Should the second stage
become active, the appliance will function on
minimum power until it reaches 30°C.
●anti-blockfunction–theanti-blockfunctionena-
bles the pump and divertor valve actuator, to
be energised for short periods, when the ap-
pliance has been inactive for more than 19-
hours.
1.3 MODE OF OPERATION (Heating)
When there is a request for heat via the
programmer/time clock and/or any external
control, the pump and fan are started, the fan
speed will modulate until the correct signal
voltage is received at the control PCB. At this
point an ignition sequence is enabled.
Ignition is sensed by the electronic circuitry to
ensure flame stability at the burner. Once
successful ignition has been achieved, the
electroniccircuitry increases the gas rateto 75%
foraperiodof 15 minutes. Thereafter,theboiler’s
output will either be increase to maximum or
modulate to suit the set requirement. When the
appliance reaches the desired temperature the
burner will shut down and the boiler will perform
a three-minute anti-cycle (timer delay).
Whenthe request for heat hasbeen satisfied the
appliancepumpand fan maycontinueto operate
to dissipate any residual heat within the
appliance.
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
voltage is received at the control PCB. At this
point an ignition sequence is enabled.
During DHW request LED (31, fig. 1) is ON.
Ignition is sensed by the electronic circuitry to
ensure flame stability at the burner. Once
SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE
successful ignition has been achieved, the
electronic circuitry increases the gas rate to
maximum or will modulate output to stabilise the
temperature. In the event of the appliance
exceedingthedesiredtemperaturetheburnerwill
shut down until the temperature drops.
When the request for DHW has been satisfied
the appliance pump and fan may continue to
operate to dissipate any residual heat within the
appliance.
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
pressure drop below the rated tolerance.
●a high limit thermostat that over-rides the
temperature control circuit to prevent or
interrupt the operation of the burner.
●an analogue pressure switch (PAD) that
checkstheoperationofthefanandflue thereby
allowing safe operation of the burner.
●a sensor that interrupts the operation of the
appliance if the condense pipe becomes
blocked.
●asafetyvalvewhich releases excess pressure
from the primary circuit.
1.6 OPTIONAL ACCESSORIES
The Syntesi is suitable for use with a range of
optional accessories that enable enhanced
operation and/or applications. These include:
●RC05 remote control – the RC05 remote
controlenables the appliance tobe controlled,
adjusted,andmonitored from anotherlocation
orroom.TheRC05canalsobeusedas a room
thermostatorprogrammableroomthermostat.
●external sensor – used in conjunction with the
RC05 the external sensor enables the
appliancetoautomatically adjust its outletflow
temperature in response to the outside
temperature.
Fig. 2
Flue Outlet Air Intake
AB CD
Expansion
vessel
Latent Heat
Collector
PAD
AARV
Pump
Main Heat
Exchanger
Main
Burner
GasValve
Domestic
Heat
Exchanger
Diverter
Valve Motor
Pressure
Switch DHW Flow
Switch

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SECTION 2 TECHNICAL DATA
2.1 Central heating Syntesi 25 Syntesi 29 Syntesi 35
Heat input 25.0 kW 29.0 kW 35.0 kW
Max heat output 60/80°C (return & flow temp.) 24.1 kW 28.0 kW 33.9 kW
Max heat output 30/50°C (return & flow temp.) 25.9 kW 29.7 kW 36.2 kW
Min heat output 60/80°C (return & flow temp.) 9.5 kW 9.5 kW 9.4 kW
Min heat output 30/50°C (return & flow temp.) 10.1 kW 10.2 kW 10.2 kW
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 25.0 kW 29.0 kW 35.0 kW
Maximum output 24.1 kW 28.0 kW 33.9 kW
Minimum output 9.5 kW 9.5 kW 9.4 kW
Flow rate (35oC rise) 9.9 kW 11.5 kW 13.9 kW
Maximum inlet pressure 6.0 bar
Minimum inlet pressure 0.15 bar
Minimum flow rate 2.0 l/min
2.3 Gas pressures
Inlet pressure (G20) 20.0 mbar
Burner pressure maximum 8.8 mbar 9.3 mbar 10.1 mbar
Burner pressure minimum 1.5 mbar 1.25 mbar 1.00 mbar
Maximum gas rate 2.65 Sm3/h 3.07 Sm3/h 3.75 Sm3/h
Minimum gas rate 1.05 Sm3/h 1.05 Sm3/h 1.05 Sm3/h
Injector size (quantity) 12 x 1.35 mm 14 x 1.35 mm 16 x 1.35 mm
2.4 Expansion vessel
Capacity 8-litres 10-litres
Maximum system volume 76-litres 91-litres
Pre-charge pressure 1.0 bar
2.5 Dimensions
Height 820mm
Width 400mm 450mm 500mm
Depth 350mm
Dry weight (kg) 44.0 45.0 48.0
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
Condense 21mm
2.8 Electrical
Voltage (V/Hz) 230/50
Power consumption 174W 174W 194W
Internal fuse 2A
External fuse 3A
2.9 Flue details (concentric)
Maximum horizontal flue length (60/100mm) 5.75m 4.90m 0.75m
Maximum vertical flue length (60/100mm) 6.55m 5.70m 1.55m
Maximum horizontal flue length (80/125mm) 13.80m 11.80m 6.75m
Maximum vertical flue length (80/125mm) 15.30m 13.30m 8.25m
2.9A Flue Details (twin pipes)
Maximum horizontal flue length (80mm + 80mm) 25m+25m 20m+20m 10m+10m
Maximum vertical flue length (80mm + 80mm) 25m+25m 20m+20m 10m+10m
2.10 Efficiency
SEDBUK (%) 87.4 87.5 88.1

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2.11 PUMP DUTY
Fig. 3 shows the flow-rate available – af-
terallowing for pressureloss through the
appliance – for system requirements.
When using this graph, apply only the
pressure loss of the system. The graph
is based on a 20°C temperature differ-
ential.
SECTION 2 TECHNICAL DATA
Fig. 3
Water pressure (mbar)
Litres Per Hour
2.12 Emissions
NOx max/min 160/140 180/120 160/110
CO max/min 70/20 100/60 90/80
CO2 max/min 6.5/4.8 6.60/4.15 6.5/3.7
CO/CO2 ratio max/min 0.00108 to 1/0.00044 to 1 0.00152 to 1/0.00145 to 1 0.00138 to 1/0.00216 to 1
Syntesi 25 Syntesi 29
Fig. 4
Syntesi 35
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 1200 1300
Syntesi 35
Syntesi 25& 29
Appliance
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
HH

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SECTION 3 GENERAL REQUIREMENTS (UK)
This appliance must be installed by a competent
person in accordance with the Gas Safety
(Installation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in
accordancewiththe relevant requirementsofthe
Gas Safety (Installation & Use) Regulations, the
localbuildingregulations,thecurrentI.E.E.wiring
regulations, the bylaws of the local water
undertaking, the Building Standards (Scotland)
Regulation, and Building Standards (Northern
Ireland) Regulations.
Itshould be in accordance alsowith any relevant
requirements of the local authority and the
relevantrecommendationsofthefollowingBritish
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
provisionsoftheBuildingRegulations,withrespect
to the installation of the appliance in a room or
internal space containing a bath or shower.
Whenanapplianceisinstalledinaroomorinternal
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.
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
compartmentusedtoenclosetheappliance must
be designed and constructed specifically for this
purpose.Anexisting compartment/cupboard may
be utilised provided that it is modified to suit.
Detailsofessentialfeaturesofcompartment/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
–mustbecheckedtoensurethat it is of adequate
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 BS6891.
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
The terminal should be located where the
dispersalof combustion products is notimpeded
and with due regard for the damage and
discolorationthat may occur to buildingproducts
locatednearby.Theterminal must notbe 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 will
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.
Refer to BS 5440 Part 1, when the terminal is
0.5 metres (or less) below plastic guttering or 1
metre (or less) below painted eaves.
3.5 AIR SUPPLY
The following notes are intended for general
guidance only.
Thisappliance is aroom-sealed, fan-flued boiler,
consequently it does not require a permanent
airventfor combustion air supply.When installed
in a cupboard or compartment, ventilation for
cooling purposes is also not required.
BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION
BS 5449 PART1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
(2nd FAMILY GASES)
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART1 APPLICATION, SELECTIONAND INSTALLTION OF EXPANSION VESSELS AND
ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

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3.6 WATER CIRCULATION
Detailedrecommendations are givenin BS 5449
Part 1 and BS 6798. The following notes are for
general guidance only.
3.6.1 PIPEWORK
Itisrecommended that coppertubingto BS 2871
Part 1 is used in conjunction with soldered
capillary joints.
Where possible pipes should have a gradient to
ensureairiscarried naturally to airreleasepoints
and that water flows naturally to drain cocks.
Exceptwhereprovidingusefulheat, pipes should
be insulated to avoid heat loss and in particular
to avoid the possibility of freezing. Particular
attentionshouldbepaid 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
external by-pass, however the design of the
system should be such that it prevents boiler
‘cycling’.
3.6.3 DRAIN COCKS
Thesemust be located in accessiblepositions to
facilitate draining of the appliance and all water
pipesconnected totheappliance.Thedraincocks
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 (25/29) or 10 litres (35) 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 (see 6.19).
3.6.6 FILLING POINT
A method for initial filling of the system and
replacingwater lost duringservicingetc.hasbeen
provided.This methodof 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
aspectsof the system are capable ofwithstanding
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
completeisolationfrom the supply.Thepreferred
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
corresponding controls, i.e. time clock, room
thermostat, etc. Alternatively an un-switched
shuttered socket with a fused 3-pin plug both
complying with BS 1363 is acceptable.
3.8 SHOWERS
Iftheappliance is intendedfor use with ashower,
the shower must be thermostatically controlled
andbe suitable foruse with a combination boiler.
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,itshould be fitted inaccordancewith the
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 low water-content,copperheatexchang-
ers – is used to protect the boiler and system
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
The installation of this boiler must be in
accordancewiththe relevant requirementsofthe
local building regulations, the current ETCI
NationalRulesforElectrical Installations, and the
bylaws of the local water undertaking.
Itshould be in accordance alsowith any relevant
requirementsof the local and/ordistrict 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
NationalRulesforElectricalInstallations,and I.S.
813, Annex K.
Whenanapplianceisinstalledinaroomorinternal
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.
Thelocation chosen for theappliancemustpermit
the provision of a safe and satisfactory flue and
termination. The location must also permit an
adequate air supply for combustion purposes and
anadequate spaceforservicingand aircirculation
aroundthe appliance.Wheretheinstallationof the
appliance will be in an unusual location special
proceduresmaybenecessary,referto 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
–mustbecheckedtoensurethat it is of adequate
size to deal with the maximum rated input of all
SECTION 3A GENERAL REQUIREMENTS (EIRE)
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.
Ifthegassupplyservesmorethanoneappliance,
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
The terminal should be located where the
dispersalof combustion products is notimpeded
and with due regard for the damage and
discolorationthat may occur to buildingproducts
locatednearby.Theterminal must notbe located
in a place where it is likely to cause a nuisance
(see I.S. 813).
In cold and/or humid weather, water vapour will
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.
Referto I.S. 813,when the terminalis 0.5 metres
(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.
Thisappliance is aroom-sealed, fan-flued boiler,
consequentlyit 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
required.
3A.6 WATER CIRCULATION
Specific recommendations are given in I.S. 813.
Thefollowing notes are for general guidance only.
from the effects of corrosion and/or electrolytic
action.Theinhibitormustbeadministeredinstrict
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
appliances.

Supplied By www.heating spares.co Tel. [phone]
8
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
ensureairis carried naturally toairrelease points
and that water flows naturally to drain cocks.
Exceptwhereprovidinguseful heat, pipes should
be insulated to avoid heat loss and in particular
to avoid the possibility of freezing. Particular
attentionshouldbepaid to pipes passingthrough
ventilatedareas suchas 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
Thesemust belocated in accessible positions to
facilitate draining of the appliance and all water
pipes connected to the appliance.
3A.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.
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 (25/29) or 10 litres (35) 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 (see 6.19).
3A.6.6 FILLING POINT
A method for initial filling of the system and
replacingwater lost duringservicingetc.hasbeen
provided.Youshould ensure thismethodof filling
complies with the local water authority
regulations.
3A.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would
be from an independent make-up vessel or tank
mounted in a position at 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
indicative of a leak. Care should be taken during
the installation of the appliance to ensure all
aspectsof the system arecapableofwithstanding
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
completeisolationfrom 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
corresponding controls, i.e. time clock, room
thermostat, etc.
3A.8 SHOWERS
Iftheappliance is intendedforuse with a shower,
the shower must be thermostatically controlled
andbe suitable foruse with acombination boiler.
3A.9 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of
combustiblematerial,asheetoffireproofmaterial
must protect the wall.
3A.10 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building, it should be 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’givesspecificadvice on thistype
of installation.
3A.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
use with low water-content, copper 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 accordance with the
manufacturers*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.