VOKERA Eclipse 216 ESS, Eclipse 226 ESS Installation & Servicing Instructions Manual

Supplied By www.heating spares.co Tel. [phone]

ESS

Installation
& Servicing
Instructions

THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Supplied By www.heating spares.co Tel. [phone]

Contents

Design principles & operating sequence Page

1.1 Principle components 2

1.2 Mode of operation (at rest) 2

1.3 Heat request mode 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 Parameter defaults 3

2.11 Emissions 3

2.12 Pump duty 4

General requirements Page

3.1 Related documents 4

3.2 Location of appliance 4

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 Combustible surfaces 6

3.9 Timber framed buildings 6

3.10 Condensate disposal 6

3.11 Inhibitors 6

Installation Page

4.1 Delivery 7

4.2 Contents 7

4.3 Unpacking 7

4.4 Preparation for mounting 7

4.5 Fitting the flue 7

4.6 Connecting the gas & water 10

4.7 Condensate outlet 11

4.8 Electrical connections 11

Commissioning Page

5.1 Gas supply installation 12

5.2 The heating system 12

5.3 Initial filling of the system 12

5.4 Initial flushing of the system 12

5.5 Pre-operation checks 12

5.6 Initial lighting 12

5.7 Final flushing of the system 12

5.8 Operating parameters 13

5.9 Functional parameters 13

5.10 Range rating 13

5.11 Setting the system design pressure 13

5.12 Regulating the central heating system 13

5.13 Final checks 14

5.14 Instructing the user 14

Servicing Page

6.1 General 14

6.2 Routine annual servicing 14

6.3 Replacement of components 14

6.4 Component removal procedure 14

6.5 Pump head removal 15

6.6 Safety valve removal 15

6.7 Automatic air valve removal 15

6.8 Pressure gauge removal 15

6.9 Temperature sensor removal 15

6.10 Main PCB removal 15

6.11 Gas valve removal 16

6.12 Fan removal 16

6.13 Burner removal 16

6.14 Electrode removal 16

6.15 Injector removal 16

6.16 Hydraulic manifold assembly 17

6.17 Condense trap removal 17

6.18 Condense pressure switch removal 17

6.19 Combustion cover removal 17

6.20 Expansion vessel removal 18

6.21 Input & status PCB removal 18

Checks, adjustments, and fault finding Page

7.1 Checking appliance operation 19

7.2 Mode of operation 19

7.3 Checking/adjusting fan speeds 19

7.4 Adjusting the gas valve 20

7.5 Status code 21

7.6 Lockout faults codes 21

7.7 Diagnostic recall 21

7.8 Temperature sensor viewing mode 22

7.9 Checking the expansion vessel 22

7.10 External faults (installation) 22

7.11 Electrical checks 22

7.12 Fault finding 23

Wiring diagrams Page

8.1 Important note 26

8.2 Installation of Vokera time clock 26

8.3 External controls 26

Exploded diagrams Page

9.1 Table 1 31

9.2 Table 2 32

9.3 Table 3 33

9.4 Table 4 34

9.5 Table 5 35

L.P.G. instructions Page

10.1 Technical data 36

10.2 Related documents 36

10.3 Gas supply 36

10.4 Gas supply installation 36

10.5 Adjusting the gas valve 36

10.6 Range rating 37

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INTRODUCTION

The Vokera Eclipse 216 ESS & 226 ESS are central
heating condensing boilers, which - by design ­incorporates full sequence electronic ignition, circulating
pump, expansion vessel, safety valve, pressure gauge
and automatic by-pass.

The Eclipse 216 & 226 ESS boilers are produced as room
sealed, category C1, C3, C6 appliances, suitable for wall
mounting applications only. The Eclipse is provided with
a fan powered flue outlet with an annular co-axial

combustion air intake that can be rotated – horizontally –
through 360 degrees for various horizontal or vertical
applications. The Eclipse can also be used with the
Vokera twin flue system.

These appliances are designed for use with sealed
systems only; consequently they are not intended for use
on open vented systems.

A range rating facility is incorporated in the appliance.

General layout

1 Auto air vent
2 Flue outlet & air intake
3 Flue gas analysis test point
4 Burner plate
5 Spark/Sensing Electrode
6 Fan assembly
7 Pressure switch
8 Electronic Control Board (PCB)
9 Condense trap
12 Gas connection
13 Pressure gauge
14 Time clock aperture
15 Function key pad
16 LED display
17 Reset button
18 Heating flow connection
19 Safety valve
20 Heating return connection
21 Auto by-pass
22 Hydraulic manifold
23 Pump
24 Return sensor (NTC2)
25 Gas valve
26 Flow sensor (NTC1)

Fig. 1

1

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SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE

1.1 PRINCIPLE COMPONENTS

● A fully integrated electronic control board

featuring electronic 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)

When there is no demand for heating or hot
water. And the appliance remains inactive for a
period of 24 hours, the pump will be energised for
a few moments to prevent it from seizing. Should
the flow temperature sensor fall below 7°C the
pump will be energised.
If the flow sensor temperature falls to below 3°C
the burner will be lit and the appliance will operate
at the minimum output until the temperature of
the flow sensor reaches 10°C, whereupon the
pump will continue to run in pump over-run mode.

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;

● a differential temperature protection circuit which

interrupts the burner if the temperature
differential is inverted;

● a fan speed sensor which checks the correct

operation of the fan, thereby allowing safe
operation of the burner;

● a safety valve which releases excess pressure

from the primary circuit.

● a condense pressure switch that will stop the

burner from operating should the condense
trap become blocked.

1

1.3 MODE OF OPERATION (heating/hot water
request)

When there is a request for heat via the time clock
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, the ignition sequence commences. 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, consequently a high temperature at the
flow sensor results in a lower fan speed. As the
water temperature increases, the temperature
sensors – located on the flow & return pipes of the
boiler – reduce the fan speed via the electronic
circuitry. Depending on the load, either the water
temperature will continue to rise until the set point
is achieved or the water temperature will fall
whereby fan speed will increase relative to the
output required. When the boiler has reached the
set point, the burner will switch off. The built-in
anti-cycle device prevents the burner from re­lighting 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.

Fig. 2

4

return flowgas

Main Heat
Exchanger

Expansion
vessel

2

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SECTION 2 TECHNICAL DATA

216 226

2.1 Central heating

Heat input 17,80 kW 29,00 kW
Maximum heat output 60/80°C (return & flow temperature) 15,40 kW 25,30 kW
Maximum heat output 30/50°C (return & flow temperature) 16,80 kW 26,8 kW
Minimum heat output 60/80°C (return & flow temperature) 4,40 kW 7,3 kW
Minimum heat output 30/50°C (return & flow temperature) 4,90 kW 8,10 kW
Minimum working pressure 0,45 bar 0,45 bar
Maximum working pressure 3 bar 3 bar
Minimum flow rate 350 l/h 350 l/h

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 injectors with six 3,1mm holes single injectors with six 3,8mm holes

2.3 Expansion vessel

Capacity 8 litres 8 litres
Maximum system volume 76 litres 76 litres
Pre-charge pressure 1,0 bar 1,0 bar

2.4 Dimensions

Height 790 mm 790 mm
Width 450 mm 450 mm
Depth 322 mm 322 mm
Dry weight 57 kg 57 kg

2.5 Clearances

Sides 25 mm 25 mm
Top

Bottom 150 mm 150 mm
Front 600 mm 600 mm

2.6 Connections

Flow & return 22 mm compression 22 mm compression
Gas 1/2 inch BSP 1/2 inch BSP
Safety valve 1/2 inch BSP 1/2 inch BSP

2.7 Electrical

Voltage 230V/~ 50hz 230V/~ 50hz
Power consumption 130 W 130 W
Internal fuse 2 A 2 A
External fuse 3 A 3 A

2.8 Flue details

Maximum horizontal flue length (concentric) 10 metres 6,45 metres
Maximum vertical flue length (concentric) 11 metres 7,45 metres
Maximum twin flue length (horizontal or vertical) 39 m + 39 m 29 m + 29 m

2.9 Efficiency

SEBDUK rating Band “A” Band “A”

2.10 Operating parameters (factory default shown)

Maximum fan speed 4.000 RPM 5.500 RPM
Minimum fan speed 1.300 RPM 1.700 RPM
Soft light setting 100 (%) 80 (%)
Anti-cycle delay (variable between 0 sec.-360 sec.) 180 sec. 180 sec.
Flow temperature (variable between 20°-90°)75°C75°C
Pump over-run (variable between 3-99 minutes) 10 minutes 10 minutes

2.11 Emissions

NOx at maximum output 40 ppm 30 ppm
NOx at minimum output 20 ppm 15 ppm
CO at maximum output 50 ppm 50 ppm
CO at minimum output 50 ppm 50 ppm
CO2 at maximum output (air chamber cover off) 9,8 % 9,8 %
CO2 at minimum output (air chamber cover off) 9,8 % 9,8 %
CO/CO

ratio 0.0005 to 1 0.0005 to 1

2

150mm from casing or 25mm above 150mm from casing or 25mm above
flue elbow (whichever is applicable) flue elbow (whichever is applicable)

Ref. Condition 15 °C , 1013,25 mbar, dry gas NOTE: L.P.G. data refer to section 10

3

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2.12 PUMP DUTY

Fig. 3 shows the flow rate available – after allowing
for 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 20°C temperature differential.

600

500

400

300

200

100

Water pressure (mbar)

0 100 200 300 400 500 600 700 800

Fig. 3

Litres Per Hour (x100)

900 1000

1100 1200 1300 1400

Terminal position for fan assisted boiler

(minimum distance) mm
A - Directly above or below an open window 300

or other opening (e.g. air brick)
B - Below gutters, soil pipes or drain pipes 25
C - Below eaves 25
D - Below balconies or car port roof 25
E - From vertical drain pipes and soil pipes 75
F - From internal or external corners 25
G - Above ground or below balcony level 300
H - From a surface facing a terminal 600
I - From a terminal facing a terminal 1200

Fig. 4

SECTION 3 GENERAL REQUIREMENTS

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 accord­ance 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.

It should be in accordance also with any relevant
requirements of the local authority and the relevant
recommendations of the following British Standard
Codes of Practice.

J - From an opening in the car port (e.g. door

window) into dwelling. 1200
K - Vertically from a terminal on the same wall 1500
L - Horizontally from a terminal on the same wall 300
M - Horizontally from a vertical terminal to a wall 300

N – Horizontally from an opening, airbrick, openable

window, etc. 300

NOTE:The flue must be terminated in a place not likely to cause a
nuisance.

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

respect to the installation of the appliance in a

room or internal space containing a bath or shower.

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.

The location chosen for the appliance must permit

the provision of a safe and satisfactory flue and

termination. The location must also permit an

adequate air supply for combustion purposes

4

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BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES AND 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

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/cup­board may be utilised provided that it is modified
to suit.

Details of essential features of compartment/
cupboard design, including airing cupboard in­stallations, 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 ensure that 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 BS 6891.

If the gas supply serves more than 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 disper­sal of combustion products is not impeded and
with due regard for the damage and discoloration
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).

Water vapour will condense on leaving the flue
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.

This appliance is a room sealed, fan-flued boiler,
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 required.

3.6 WATER CIRCULATION

Detailed recommendations are given in BS 5449
Part 1 and BS 6798. The following notes are for
general guidance only.

3.6.1 PIPEWORK

It is recommended that copper tubing to BS 2871
Part 1 is used in conjunction with soldered capil­lary joints.

Where possible pipes should have a gradient to
ensure air is carried naturally to air release points
and that water flows naturally to drain cocks.

Except where providing useful heat, pipes should
be insulated to avoid heat loss and in particular to
avoid the possibility of freezing. Particular atten­tion 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 ex­ternal by-pass, however the design of the system
should be such that it prevents boiler ‘cycling’.

3.6.3 DRAIN COCKS

These must be located in accessible positions to
facilitate draining of the appliance and all water pipes
connected to the appliance. The drain cocks 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

5

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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 (see 6.19).

3.6.6 FILLING POINT

A method for initial filling of the system and
replacing water lost during servicing etc. must be
provided. This method of filling must comply with
the local water authority regulations. Fig. 5 shows
a widely accepted method.

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

complete 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

corresponding controls, i.e. time clock, room ther-

mostat, etc. Alternatively an un-switched shuttered

socket with a fused 3-pin plug both complying

with BS 1363 is acceptable.

3.8 MOUNTING ON A COMBUSTIBLE SURFACE

If the appliance is to be fitted on a wall of combus-

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, it should be fitted in accordance with the

Institute of Gas Engineers publication (IGE/UP/7)

“Guide for Gas Installations in Timber Frame Buildings”.

Fig. 5

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 A). 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.

Make-up vessel
or tank

Automatic
air-vent

Non-return

valve

Stopcock

3.10 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.

3.11 INHIBITORS

The system shall be flushed in accordance with

BS 7593. If an inhibitor is to be used, it shall be

from a reputable manufacturer and shall be

administered in strict accordance with the

manufacturers instructions.

5.0 metres minimum

Heating

Fig. 5 A

return

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 withstand­ing pressures up to at least 3 bar.

Fig. 6

6

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SECTION 4 INSTALLATION

4.1 DELIVERY

The appliance is delivered in 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 mounting bracket;

● template;

● an accessories pack containing the appliance

service valves and washers;

● the instruction pack containing the installation

& servicing instructions, user instructions,
Benchmark logbook, guarantee registration
card, and a 3amp fuse.

4.3 UNPACKING

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 pro­tective packaging from the appliance, and lay the
accessories etc. to one side.

4.4 PREPARATION FOR MOUNTING THE
APPLIANCE

The appliance should be mounted on a smooth,
vertical, non-combustible surface, which must be
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 – using the template supplied – carefully
mark the position of the wall-mounting bracket
(see fig. 6) and flue-hole (if applicable).

Horizontal flue terminals and accessories

Part No.

0225720

0225755
0225740
0225745
0225750
0225730
0225735
0225760

Description

Horizontal flue kit for use with
add. bends & extensions

350-500 T elescopic extension
0,5m extension
1,0m extension
2,0m extension
45° bend (pair)
90° bend
Wall bracket (5)

Using the template provided (see fig. 6), mark
and drill a 125mm hole for the passage of the
flue pipe. The hole should ha ve a 1° rise from the
boiler to outside.

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 br acket has been secured to
the wall, mount the appliance onto the brack et.

FITTING THE HORIZONTAL FLUE KIT

Black

gasket

Min-Max length
1000mm

350mm-500mm
500mm
1000mm
2000mm
N/A
N/A
N/A

Boiler top

adaptor

Flue outlet

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 4.5.2).
(For twin flue applications, see 4.5.3).
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 2.8). A reduction must also
be made to the maximum length (see table below)
when additional bends are used.

Reduction for additional bends
Bend
45° bend
90° bend

Reduction in maximum flue length for each bend
0,5 metre

1,0 metre

Boiler

Fig. 7

Take the large black gasket - supplied with the
flue terminal kit - and stretch it over the appliance
flue outlet (fig. 7). Using a twisting motion, connect
the boiler top adaptor - supplied with the flue
terminal kit - to the appliance flue outlet ensuring
the male spigot of the adaptor is pushed fully into
the flue outlet spigot of the boiler (fig. 7). Carefully
measure the distance from the centre of the
appliance flue outlet to the edge of the finished
outside wall (dimension X). Add 45mm to
dimension X to give you Dimension Y (see fig
7A). Measure dimension Y from 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 adaptor and insert the concentric flue
pipe into the flue bend ensuring the correct seal
is made.

7

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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.

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.

Push-fit connection

Extension pipe

Plain end

Fig. 7A

4.5.1.1 EXTENDING THE FLUE

Connect the bend – supplied with the terminal kit
– to the top of the boiler using the boiler top
adapter (supplied, see fig. 7). The additional
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 (see fig. 7B & 7C).

Push-fit
connection

Boiler top
adaptor

Extension

Boiler top adaptor

Boiler

Fig. 7C

4.5.2 CONCENTRIC VERTICAL FLUE

The vertical flue terminal can be connected directly
to the appliance flue outlet.
Alternatively, an extension or bend can be
connected to the appliance flue outlet if desired
(see 2.8), however if additional bends are fitted,
a reduction must be made to the maximum flue
length (see table below).

Reduction for bends

Bend
45° bend
90° bend

Reduction in maximum flue length for each bend
0,5 metre

1,0 metre

Boiler

Part No.

Fig. 7B

NOTE

When cutting an extension to the required length,
you must ensure that the excess is cut from the
plain end of the extension (see fig. 7B & 7C).
Remove any burrs, and check that any seals are
located properly.
You must ensure that the entire flue system is
properly supported and connected.

0225725
0225770
0225765
0225755
0225740
0225745
0225750
0225730
0225735
0225760

8

Vertical flue terminal and accessories

Description
Vertical flue terminal

Pitched roof flashing plate
Flat roof flashing plate
350-500 telescopic extension
0,5m extension
1,0m extension
2,0m extension
45° bend (pair)
90° bend
Wall bracket (4)

Min-Max length
1000 mm

N/A
N/A
350mm-500mm
500mm
1000mm
2000mm
N/A
N/A
N/A

Supplied By www.heating spares.co Tel. [phone]

Using the dimensions given in fig. 8 as a reference,
mark and cut a 105mm hole in the ceiling and/or roof.

IMPORTANT

You must ensure that the terminal is at least
300mm from any structure or surface (see fig. 8).
The vertical flue terminal is 1,0 metre in length
and cannot be cut; therefore it may be necessary
to adjust the height of the appliance to suit or use
a suitable extension.
Encure that any horizontal sections of the flue system
have a 1° fall back to the boiler (17mm per 1000mm).

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.

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.

GUIDANCE NOTES ON TWIN FLUE
INSTALLATION

● The flue must hav e a f all back of 1° back to the

appliance to allow any condensate that forms
in the flue system to drain. Consideration must
also be given to the fact that there is the
possibility of a small amount of condensate
dripping from the terminal.

● Ensure that the entire flue system is adequately

supported, use at least one bracket for each
extension.

● As the exhaust outlet pipe can reach v ery high

temperatures it must be protected to prevent
persons touching the hot surface.

Reduction for bends

Bend
45° bend

90° bend

Reduction in maximum flue length for each bend
1,0 metre

1,0 metre

Twin flue accessories

300mm minimum

Fig. 8

NOTE

When cutting an extension to the required length,
you must ensure that the excess is cut from the
plain end of the extension.
Remove any b urrs, and check that an y seals are
located properly .

4.5.3 TWIN FLUE SYSTEM

The Vokera twin flue system enables greater flue
distances to be achieved (see 2.8) than that of the
standard concentric flue system. It can be used f or
horizontal or vertical applications, howev er 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 carried
out in strict accordance with these instructions.

520mm

520mm

Part No.

0225805
0225810
359
0225770
0225765
0225815
0225820
0225825
0225830
0225835
0225840
0225845
0225850
0225855

Description
Horizontal flue terminal

Vertical flue terminal
Twin adapter kit
Pitched roof flashing plate
Flat roof flashing plate
Condensate drain kit
0,25m extension (pair)
0,5m extension (pair)
1,0m extension (pair)
2,0m extension (pair)
45° bend (pair)
90° bend (pair)
Twin bracket (5)
Single bracket (5)

Length
1000 mm

1000 mm
N/A
N/A
N/A
N/A
250mm
500mm
1000mm
2000mm
N/A
N/A
N/A
N/A

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 br acket has been secured to
the wall, mount the appliance onto the bracket.

4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (see
fig. 9)

● Discard the restrictor ring (supplied with the twin

adapter kit).

● Insert the exhaust connection manifold onto the

appliance flue outlet.

● Place the silicone seal (supplied with twin

adapter kit) over the rim of the exhaust
connection manifold.

● Remove one of the blanking plate (located to

the left & right of the appliance flue outlet) and
– using the same screws – install the air baffle.

9

Supplied By www.heating spares.co Tel. [phone]

Fig. 9

4.5.3.2 HORIZONTAL TERMINATION (see 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 130mm hole is required for the passage of

the concentric terminal through the wall.

Depending on site conditions it may be prefer able
to install the terminal assembly prior to fitting the
twin flue pipes.

Mark and drill a 130mm hole for the passage of
the horizontal flue terminal, ensuring that there
is a 1° fall back to the boiler (17mm per 1000mm).
Insert the terminal assembly into the flue hole.

Push-fit the twin flue pipes onto the concentric to
twin converter box 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 ha ve
been made for connection onto the previous piece
and onto the concentric to twin converter.
The last twin flue pipes must be pushed 50mm onto
the male spigots of the concentric to twin converter.

NOTE

You must ensure that the entire flue system is
properly supported and connected.
When cutting an extension to the required length,
you should ensure that the excess is cut from
the plain end of the extension. Remove an y burrs,
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 (see 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 130mm hole is required for the passage of

the concentric terminal through the ceiling and/or roof.
Depending on site conditions it may be pref erable

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-fit the twin flue pipes onto the concentric 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
onto the previous piece and onto the concentric
to twin converter. The last twin flue pipes must
be pushed 50mm 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 hav e

a 1° fall towards the appliance (17mm per
1000mm).

● The convertor box on the vertical terminal will

have to be temporarily remo ved when inserting
the terminal through the flashing.

convertor box

Fig. 11

convertor box

4.6 CONNECTING THE GAS AND WATER

Fig. 10

10

The appliance is supplied with an accessories pack
that contains sealing washers and service valves.
When connecting pipe work to the valves, tighten
the compression end first, then insert the sealing
washers before tightening the valve to the appliance.