VOKERA Vision 25C, Vision 30C User Instructions

Users Instructions

Installation &
Servicing
Instructions

THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.

Vision C

High efciency combi boiler

37

Users instructions

Things you should know Page

1.1 Gas appliances 1

1.2 Electrical supply 1

1.3 Guarantee registration card 1

1.4 Appliance Log Book (UK only) 1

1.5 How does it work? 1

1.6 Dimensions 1

1.7 Clearances required 1

1.8 Frost protection system 1

1.9 Appliance status indicators 1

Getting started Page

2.1 Before switching ON 6

2.2 Appliance controls 6

2.3 Lighting the boiler 6

2.4 Adjusting the heating temperature 6

2.5 Adjusting the hot water temperature 6

2.6 Explanation of features 6

2.7 Automatic temperature control 6

How to... Page

3.1 How to top-up the system pressure 6

3.2 How to reset the appliance 6

3.3 How to shut down the system for short periods 6

3.4 How to shut down the system for long periods 6

3.5 How to care for the appliance 6

What if... Page

4.1 What if I suspect a gas leak 7

4.2 What if I have frequently top-up the system 7

4.3 What if the appliance is due its annual service 7

4.4 What if I need to call an engineer 7

Installation and Servicing instructions

Design principles & operating sequence Page

1.1 Principle components 9

1.2 Mode of operation (at rest) 9

1.3 Mode of operation (heating) 9

1.4 Mode of operation (Hot water) 9

1.5 Safety devices 9

Technical data Page

2.1 Central heating 10

2.2 Domestic hot water 10

2.3 Gas pressures 10

2.4 Expansion vessel 10

2.5 Dimensions 10

2.6 Clearances 10

2.7 Connections 10

2.8 Electrical 10

2.9 Flue details (concentric 60-100) 10

2.9A Flue details (concentric 80-125) 10

2.9B Flue details (twin pipes) 10

2.10 Efciency 11

2.11 Emissions 11

2.12 Pump duty 11

General requirements (UK) Page

3.1 Related documents 12

3.2 Location of appliance 12

3.3 Gas supply 12

3.4 Flue system 12

3.5 Air supply 12

3.6 Water circulation 12

3.7 Electrical supply 13

3.8 Mounting on a combustible surface 13

3.9 Timber framed buildings 13

3.10 Inhibitors 13

3.11 Showers 13

General requirements (EIRE) Page
3A.1 Related documents 13
3A.2 Location of appliance 13
3A.3 Gas supply 13
3A.4 Flue system 13
3A.5 Air supply 14
3A.6 Water circulation 14
3A.7 Electrical supply 14
3A.8 Mounting on a combustible surface 14
3A.9 Timber framed buildings 14
3A.10 Inhibitors 14
3A.11 Showers 14
3A.12 Declaration of conformity 14

Installation Page

4.1 Delivery 15

4.2 Contents 15

4.3 Unpacking 15

4.4 Preparation for mounting the appliance 15

4.5 Fitting the ue 15

4.6 Connecting the gas & water 19

4.7 Electrical connections 19

Commissioning Page

5.1 Gas supply installation 20

5.2 The heating system 20

5.3 Initial lling of the system 20

5.4 Initial ushing of the system 20

5.5 Pre-operation checks 20

5.6 Initial lighting 20

5.7 Checking gas pressure & combustion analysis 20

5.8 Final ushing of the heating system 20

5.9 Setting the boiler operating temperature 20

5.10 Setting the system design pressure 20

5.11 Regulating the central heating system 21

5.12 Final checks 21

5.13 Instructing the user 21

Servicing Page

6.1 General 21

6.2 Routine annual servicing 21

6.3 Replacement of components 21

6.4 Component removal procedure 21

6.5 Pump assembly 22

6.6 Safety valve 22

6.7 Lower automatic air release valves 22

6.8 Water pressure switch 22

6.9 Flow thermistor 22

6.10 Return thermistor 22

6.11 Printed circuit board 22

6.12 Gas valve 23

6.13 Electrodes 23

6.14 Flue fan & mixer 23

6.15 Burner 23

6.16 Main heat exchanger 24

6.17 Automatic by-pass & DHW non-return valve 24

6.18 Expansion vessel removal 24

6.19 Condense trap removal 24

6.20 Flue collector removal 25

Checks, adjustments and fault nding Page

7.1 Checking appliance operation 26

7.2 Appliance modes of operation 26

7.3 Checking the CO2 & adjusting the valve 26

7.4 Combustion analysis test 27

7.5 Checking the expansion vessel 27

7.6 External faults 27

7.7 Electrical checks 27

7.8 Fault nding 28

7.9 Component values & characteristics 28

7.10 Adjustments 29

Wiring diagrams Page

8.1 External wiring 31

8.2 Other devices 31

L.P.G. instructions Page

10.1 Related documents 33

10.2 Technical data 33

10.3 Converting the appliance gas type 33

10.4 Gas supply 33

10.5 Gas supply installation 33

10.6 Checking the CO2 and adjusting the gas valve 33

Benchmark 35-36

1

USERS INSTRUCTIONS

1.1 GAS APPLIANCES

Gas Safety (Installation and Use) Regulation (UK).

In the interests of your safety and that of others it is a legal
requirement that all gas appliances are installed and correctly
maintained by a competent person and in accordance with the
latest regulations.

1.2 ELECTRICAL SUPPLY

Please ensure that this appliance has been properly connected
to the electrical supply by means of a double pole isolator or
un-switched socket, and that the correct size of fuse (3 AMP)

has been tted.

Warning: this appliance must be earthed!

1.3 GUARANTEE REGISTRATION CARD

Please take the time to ll out your guarantee registration card.

The completed warranty card should be posted within 30 days
of installation.

1.4 APPLIANCE LOG BOOK (UK only)

A logbook section can be found at the rear of the appliance
installation booklet. This important document must be completed
during the installation/commissioning of your boiler. All GAS
SAFE registered installers carry a GAS SAFE ID card, and have
a registration number. These details should be recorded in the
Benchmark logbook section within the installation booklet. You
can check your installers details by calling GAS SAFE direct on

08004085500. Failure to install and commission the appliance in
accordance with the manufacturers instructions may invalidate
the warranty. This does not affect your statutory rights.

1.5 HOW DOES IT WORK?

Your Vision boiler supplies heated water to your radiators and
hot water to your hot water taps. The central heating is con­trolled via a time clock and any thermostats that your installer

may have tted. The boiler will light when it receives a request

from the time clock via any thermostat that may be installed, or
whenever a hot water outlet (tap) is opened. Your Vision boiler
lights electronically and does not have a pilot light.
In the unlikely event of a fault developing with your boiler, the
supply of gas to the burner will be terminated automatically.

Dear Customer

Your Vokèra Vision boiler has been designed to meet and exceed the very latest standards in gas central heating technology,

and if cared for, will give years of reliable use and efciency.

Please therefore take some time to read these instructions carefully.

Do’s and Don’t’s

- Do ensure that the system pressure is periodically checked

- Do ensure that the boiler should not be used by children or unassisted disabled people

- Do ensure that you know how to isolate the appliance in an emergency

- Do ensure that you are familiar with the appliance controls

- Do ensure that your installer has completed the appliance log book section

- Do not attempt to remove the appliance casing or gain internal access

- Do not hang clothes etc. over the appliance

- Do not forget to have the appliance serviced annually.

This booklet is an integral part of the appliance. It is therefore necessary to ensure that the booklet is handed to the person re­sponsible for the property in which the appliance is located/installed. A replacement copy can be obtained from Vokèra customer
services.

INTRODUCTION

1.6 DIMENSIONS

1.7 CLEARANCES REQUIRED

ABOVE 150 mm
BELOW 150 mm
LEFT SIDE 12 mm
RIGHT SIDE 12 mm
FRONT 600 mm

Vision 25C - 30C

HEIGHT 715 mm
WIDTH 405 mm
DEPTH 248 mm

1.8 FROST PROTECTION SYSTEM

The Vision is equipped with a built-in frost protection system,
this enables the boiler to over-ride the time controls – even if
switched off – and operate the burner and/or pump, should
the temperature drop below 5

0

C for the main and for the DHW
line. In particular the burner will be in ON status until the main
temperature reaches 35°C for CH appliance and 55°C for
DHW appliance. Please note that the frost protection system
is designed to protect the appliance only, should frost protec­tion be required for the heating system, additional controls
may be required.

NOTE

The frost protection system is reliant on the appliance having a
permanent electrical supply, and being in a non-fault condition.

1.9 APPLIANCE STATUS INDICATORS

Your boiler is equipped with a large LCD display that indicates
the appliance operating status.

1. THINGS YOU SHOULD KNOW

2

Fig. 1

HOT WATER TEMPERATURE SELECTOR

Move the selector clockwise to increase the hot water outlet temperature, or counter-clockwise to reduce the temperature

PRESSURE GAUGE

Ensure the system pressure is set correctly (minimum 0.5-bar)

MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR

Mode selector switch:

Hot water only - Select this position if you want the boiler to supply hot
water only (no heating)

Hot water temperature selector: move the selector clockwise to increase
the DHW outlet temperature, or counter-clockwise to reduce the temperature
(range: 37°C-60°C)
The display shows the temperature values.

Boiler at OFF/standby - Select this position when you want the boiler to
be switched off for short periods (days) or if the boiler requires to be reset

The display shows “- -”.

Heating & hot water - Select this position when you want the boiler to re­spond to a heating and hot water request from the time-clock programmer

Heating temperature selector: move the selector clockwise to increase the
heating outlet temperature, or counter-clockwise to reduce the temperature
(range: 40°C-80°C for standard central heating).
The automatic temperature control function (SARA) is set within the blank
bullet points.
The display shows the temperature values.

Pressure gauge shows the current pressure of your heating system, the
gauge should be set between 1 and 1.5 BAR. When the appliance is oper­ating the gauge may rise or fall slightly, this is quite normal. The minimum

permissible level for the safe and efcient operation of the appliance is 0.5

BAR. Should the pressure fall below 0.5 BAR, the boiler may lockout.

correct pressure

value

MODE SELECTOR SWITCH

HEATING TEMPERATURE SELECTOR

PRESSURE GAUGE

HOT WATER

TEMPERATURE

SELECTOR

DIGITAL WEEKLY CLOCK AND

BOILER STATUS DISPLAY

DHW pre-heat function - Turning the domestic hot water temperature
adjustment knob to the symbol activates the pre-heating function. Bring the
domestic hot water temperature adjustment knob back to the required po­sition. The activation of this function is indicated on display with the P icon
ON. This function keeps the water in the domestic hot water exchanger hot,
to reduce standby times when a request is made. The display shows the
delivery temperature of the heating water or the domestic hot water, accor­ding to the current request. To deactivate the pre-heat function, rotate the
domestic hot water temperature adjustment knob back to the symbol. Bring
the domestic hot water temperature adjustment knob back to the required
position. This function cannot be activated when the boiler is OFF: function
selector to OFF position.

CLOCK SETTING

BUTTONS

3

DIGITAL WEEKLY CLOCK

Fig. 2

Button/Icon Main Function Secondary Function

Used to set/adjust
time of day, and
day of week

N/A

Use to “advance”
the heating to an
ON period

Use to increase values when
setting clock & day of week.
Use to program ON periods
for heating pattern.

Use to “advance”
the heating to an
OFF period

Use to decrease values
when setting clock & day of
week. Use to program OFF
periods for heating pattern.

Use to change
mode of operation

Use when installing a user

dened heating program.

Symbol/Icon Description/Function

Used to show current day of week

(ashing)

Displayed when the ADVANCE-ON fun­ction is active

Displayed when the ADVANCE-OFF fun­ction is active

Displays current minutes past the hour

Displays current hour of the day

24-hour clock in 30 minute segments; lar­ge segments represent hour mark, small
segments represent half-past the hour;

ashing segment represents actual time

Symbol/Icon Description

Displayed when heating mode is active

Displayed when hot water mode is active

Displayed when frost protection function is ac­tive

Displayed when hot-water pre-heat function is
enabled. Flashes when functioning

Displayed if an alarm or fault has been detected

Displayed when low system pressure has been
detected

Displayed when an external sensor is connected
to the boiler

Displayed if an ignition fault has been detected

Displayed when the burner is ON

4

BUILT-IN CLOCK

The Vision 25C & 30C incorporate a built-in digital clock and
multi-inf mative LCD display.

1.1

The digital clock is pre-programmed with a default heating

pattern (see table 1 below); however this can be modied to

suit individual needs (see 1.4).

Pre-programmed Heating Pattern

Day

am pm

ON OFF ON OFF

Monday 06:30 08:30 4:30 10:30

Tuesday 06:30 08:30 4:30 10:30

Wednesday 06:30 08:30 4:30 10:30

Thursday 06:30 08:30 4:30 10:30

Friday 06:30 08:30 4:30 10:30

Saturday 08:00 10:00 4:00 11:00

Sunday 08:00 10:00 4:00 11:00

1.2 MODES OF OPERATION

The built-in digital clock has the following modes of operation:

1. AUTO ON / AUTO OFF – where the clock uses the pro-

grammed heating pattern (default or user dened) to switch

the heating ON & OFF at pre-selected times (see Fig.1).

2. MAN ON – where the clock is set to provide heating con-

stantly ON (in this mode the default or user dened heating

pattern is ignored).

3. MAN OFF – where clock is set to have the heating constan-

tly OFF (in this mode the default or user dened heating

pattern is ignored).

4. ADVANCE ON – where the pre-programmed heating pat­tern is advanced to the next ON period (this function can
only be used when the clock is in the AUTO OFF mode)

5. ADVANCE OFF - where the pre-programmed heating pat­tern is advanced to the next OFF period (this function can
only be used when the clock is in the AUTO ON mode).

1.3 SETTING THE TIME AND DAY

Ensure that the boiler is electrically supplied.

1. Press and hold the clock button for 3-seconds; the

right hand digits (minutes) will ash continuously.

2. Press the up arrow button to increase the minutes va-

lue or press the

down arrow button to decrease the

value.

3. Once the correct minutes value is displayed, press the
clock button to store this setting and move to the hours
value.

4. Press the up arrow button to increase the hours value

or press the

down arrow button to decrease the value.

5. Once the correct hours value is displayed press the
clock button to store this setting and move to the day of
week value.

6. Press the up arrow button to move forward to the cor­rect day of week (1 = Monday – 7 = Sunday)or press the

down arrow button to move back to the correct day of

week..

7. Once the correct day of week is displayed press the
clock button to store this setting and complete the time /
day of week, setting procedure.

NOTE, the time of day is shown on the display, and is also

indicated on the 24-segmented display as a ashing segment.

1.4 CHANGING THE HEATING PATTERN

The built-in clock is pre-programmed with a default heating
pattern (see Fig.1), however this can be changed to a user

dened heating pattern.

To insert a new heating pattern or change and existing one,
proceed as follows:

1. Press and hold the program button for 3-seconds

2. The day of week segment ashes to indicate which day of

week is being programmed

3. Use the up arrow button to select the required ON

periods and use the down arrow button to select the
OFF periods

NOTE, each segment represents 30-minutes, the large seg­ments are hour indicators, and the small segments are half­hour indicators.

4. When the ON and OFF selections have been made for the
particular day (relevant day of week is displayed by the

appropriate number 1 to 7) press the

program button

to store the new settings and move to the next day.

NOTE
If you want to duplicate the new settings for subsequent days,
e.g. same heating pattern for Monday to Friday, press and

hold the

program button for 3-seconds each time the ap-

propriate day of week is displayed.

EXAMPLE
Day of week = 1 (Monday) Insert the new ON & OFF settings

(step 3 above), press the

button, day of week now shows

2 (Tuesday). Press the button for 3-seconds, Monday’s
settings are now duplicated for Tuesday; repeat as required.

5. If you require to change the settings for subsequent days,
repeat steps 3 & 4 above

6. Once programming has been completed, continue to press

and release the program button until you exit the pro­gramming function (normal display is resumed).

1.5 ADVANCE FUNCTION

When the clock is in the AUTO ON or AUTO OFF mode, it’s
possible to advance the current setting (ON or OFF) to the
next programmed setting (ON or OFF), e.g. if the clock is in
AUTO OFF mode it’s possible to advance to the next AUTO
ON setting.

1.5.1 ADVANCE ON

Press and hold the

up arrow button for 3-seconds, the

display changes from AUTO OFF to AUTO ON and the
icon is displayed.

NOTE, the ADVANCE ON function can be cancelled by mo-

mentarily pressing the

button.

NOTE, when the ADVANCE ON function is enabled, the hea­ting will remain ON until the next scheduled OFF period.

1.5.2 ADVANCE OFF

Press and hold the

down arrow button for 3-seconds, the

display changes from AUTO ON to AUTO OFF and the
icon is displayed.

NOTE, the ADVANCE OFF function can be cancelled by mo-

mentarily pressing the

button.

Table 1

5

NOTE, when the ADVANCE OFF function is enabled, the hea­ting will remain OFF until the next scheduled ON period.

1.6 MODE OF OPERATION

To change the mode of operation (AUTO to MAN) momenta-

rily press the

button; the display will show the following:

• AUTO OFF Heating is in an OFF period according to the

programmed heating pattern

• AUTO ON Heating is in an ON period according to the

programmed heating pattern

• MAN OFF Heating is being controlled manually and is

switched constantly OFF

• MAN ON Heating is being controlled manually and is

switched constantly ON.

1.7 RESET HEATING PROGRAM TO DEFAULT VA­LUES

The heating pattern can be reset to the default values (see

g.1) by pressing and holding both

buttons simulta-

neously for 3-seconds.

NOTE

This cancels any previously input, user dened settings

6

2.1 BEFORE SWITCHING ON

Before switching the appliance on, please familiarise yourself
with:

- how to isolate the appliance from the gas, water, and electricity
supplies;

- how to check and top-up – if necessary – the system water
pressure;

- the time clock or programmer (if tted);

- any external thermostats and their functions;

- the appliance controls.

2.2 APPLIANCE CONTROLS (see g. 1)

The appliance controls are situated on the lower front of the
appliance. The appliance controls include:

- pressure gauge;

- appliance mode selector;

- temperature selectors;

- integral time clock.

NOTE

The appliance frost protection is active in all the boiler modes.
The temperature selectors can be used to vary the temperature
of the water that circulates around your radiators and the water

that ows from your hot water taps. The temperature range is

adjustable between 40

o

C and 80oC for the central heating, and

between 37

o

C and 60oC for the hot water.

The display normally shows the current time.
Refer to the main appliance status table for fault indicator and
boiler status.
The integral digital time clock is used to switch the heating on
and off at pre-determined intervals.

2.3 LIGHTING THE BOILER

Ensure the gas and electrical supply to the boiler are
turned on.

Turn the mode selector switch to the ON position. When there
is a request for heating or hot water via the time clock or pro­grammer, the boiler will begin an ignition sequence. When the

appliance reaches the CH set temperature, the burner will go
off for a minimum period of approximately 3 minutes.
When the programmer/time clock or external thermostats

heating request has been satised, the appliance will switch

off automatically.

2.4 ADJUSTING THE HEATING TEMPERATURE

Rotate the temperature selector – clockwise to increase, counter­clockwise to decrease – to the desired temperature setting. The
temperature can be set from a minimum of 40°C to a maximum
of 80°C (if standard CH mode is selected).

2.5 ADJUSTING THE HOT WATER TEMPERA­TURE

Rotate the temperature selector – clockwise to increase,
counter-clockwise to decrease – to the desired temperature
setting. The temperature can be set from a minimum of 37°C
to a maximum of 60°C. If the temperature at the outlet is still

not sufciently hot enough, it may be necessary to reduce the
ow of water at the hot water outlet (tap).

NOTE

If the appliance fails to ignite during the ignition sequence, it
will enter a lockout condition. Should this occur, please allow

a period of at least two minutes before re-setting the appliance.

2.6 EXPLANATION OF FEATURES

Although the Vokèra Vision has been designed for simplicity of
use, it utilises the latest in boiler technology, enabling a host of

functions to be carried out simultaneously.

2.7 AUTOMATIC TEMPERATURE CONTROL

The automatic temperature control function (SARA), permits
the boiler (when the heating temperature selector is set within
the blank bullet points to automatically adjust (raise) the heating.
The activation and the disable of the function is visualized on
the display if the heating temperature is selected between 55°

-65°C.

2. GETTING STARTED

3.1 HOW TO TOP-UP THE SYSTEM PRESSURE

(g. 1-2)

The system pressure must be checked periodically to ensure the
correct operation of the boiler. The needle on the gauge should
be reading between 1 and 1.5 BAR when the boiler is in an off
position and has cooled to room temperature. If the pressure
requires ‘topping-up’ use the following instructions as a guide.

- Locate the lling valve connections (usually beneath the
boiler, see g. 3).

- Attach the lling loop to both connections.

- Open the lling valve slowly until you hear water entering the

system.

- Close the lling valve when the pressure gauge (on the boiler)
reads between 1 and 1.5 BAR (see g. 1).

- Remove the lling loop from the connections.

3.2 HOW TO RESET THE APPLIANCE

When the fault code is displayed, the appliance will require to
be reset manually. Before resetting the boiler, check what action
is required to be taken, using the information on the fault code
table below. Allow a period of two minutes to elapse before rotate
the mode selector knob across the

position (see g. 1).

IMPORTANT

If the appliance requires to be reset frequently, it may be indica­tive of a fault, please contact your installer or Vokèra Customer
Services for further advice.

3. HOW TO...

Fig. 3

control

valve

temporary

connection

control

valve

supply pipe

double

check valve

ow/return

pipe

3.3 HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS

The system and boiler can be shut down for short periods by
simply turning the time clock to the off position. It is also advis­able to turn off the main water supply to the house.

3.4 HOW TO SHUT DOWN THE SYSTEM FOR
LONG PERIODS

If the house is to be left unoccupied for any length of time –
especially during the winter – the system should be thoroughly
drained of all water. The gas, water, and electricity supply to
the house should also be turned off. For more detailed advice
contact your installer.

3.5 HOW TO CARE FOR THE APPLIANCE

To clean the outer casing use only a clean damp cloth. Do not
use any scour­ers or abrasive
cleaners.

7

4.1 WHAT IF I SUSPECT A GAS LEAK

If you suspect a gas leak, turn off the gas supply at the gas
meter and contact your installer or local gas supplier. If you

require further advice please contact your nearest Vokèra ofce.

4.2 WHAT IF I HAVE FREQUENTLY TO TOP-UP
THE SYSTEM

If the system regularly requires topping-up, it may be indicative
of a leak. Please contact your installer and ask him to inspect
the system.

4.3 WHAT IF THE APPLIANCE IS DUE ITS AN­NUAL SERVICE

Advice for tenants only

Your landlord should arrange for servicing.

FAULT CODES

4. WHAT IF...

Advice for homeowners
Please contact Vokèra Customer Service (0844 3910999 (UK)
or 056 7755057 (ROI) if you would prefer a Vokèra service

engineer or agent to service your appliance. Alternatively your
local GAS SAFE registered engineer may be able to service
the appliance for you.

4.4 - WHAT IF I NEED TO CALL AN ENGINEER

If you think your boiler may have developed a fault, please contact
your installer or Vokèra Customer Services (0844 3910999 (UK)
or 056 7755057 (ROI) have all your details to hand including
full address and postcode, relevant contact numbers, and your
completed appliance log book.

ALARM CODE CAUSE ALARM TYPE ACTION

_St

AUTOSTOP Final Call engineer

_CL

CALL FOR SERVICE Temporary then

Final

Call engineer

A01

Ignition failure, ame not sensed,

internal fault

Final Reset, check appliance operation

A02

Limit thermostat fault Final Reset, check appliance operation

A03

Fan tacho signal fault Final Reset check appliance operation,

check fan

A04

Insufcient system water pressure Final Check/rell system pressure, reset,

check appliance operation

A06

DHW thermistor fault Temporary Check DHW thermistor

A07

Primary (ow) thermistor fault Temporary Check primary thermistor, check wiring

Primary (ow) thermistor over tempe-

rature

Temporary then
Final

Reset, check appliance operation

Temperature differential Final Reset, check appliance operation,

check thermistors

A08

Return thermistor fault Temporary Check return thermistor, check wiring

Return thermistor over temperature Temporary then

Final

Reset, check appliance operation

Temperature differential inverted Final Reset, check pump, ensure there is

sufcient circulation around heating

circuit/s

A09

Flue thermistor or ue thermistor

counter fault

Temporary Check ue thermistor counter at power

on, check ue thermistor, check wiring

Flue thermistor over temperature Final Reset, check appliance operation

A77

Low temperature thermostat fault Temporary Check low temperature thermostat

Adj

Calibration Na None

ACO

Service operation Na None







Purge cycle mode active Na None

P

Preheating function active Na None

P blinking

Preheating function running Na None

Flame ON Na None

Hours Stand-by Na None

- - OFF Na None

8

The Vision comprises a range of high-efciency combination

boilers with outputs to DHW of 25kW and 29kW respectively.
These appliances – by design – incorporate electronic ignition,
circulating pump, expansion vessel, safety valve, pressure
gauge and automatic by-pass.
The Vision range is produced as room sealed, category II2H3P
appliances, suitable for internal wall mounting applications only.

Each appliance is provided with a fan powered ue outlet with

an annular co-axial combustion air intake that can be rotated
– horizontally – through 360 degrees for various horizontal
or vertical applications. The Vision can also be used with the

Vokèra twin ue system.

The Vision is approved for use with C13 & C33 type ue ap-

plications.
These appliances are designed for use with a sealed system
only; consequently they are not intended for use on open
vented systems.
This booklet is an integral part of the appliance. It is therefore
necessary to ensure that the booklet is handed to the person
responsible for the property in which the appliance is located/
installed. A replacement copy can be obtained from Vokèra
customer services.

Fig. 4

General layout

1 Domestic hot water heat exchanger
2 Drain valve
3 Three porte valve actuator
4 Safety valve
5 Pump
6 Bottom auto air vent (AAV)
7 Main heat exchanger
8 Flues thermistor (NTC)
9 Fan assembly with mixer
10 Silencer
11 Flue gas analysis test point
12 Flue outlet & air intake
13 Ignition transformer
14 Top AAV+De-aerator
15 Spark Electrode
16 Sensing Electrode
17 Flow thermistor (NTC) - High limit thermostat
18 Expansion vessel
19 Pressure switch
20 Return thermistor (NTC)
21 Gas valve
22 Domestic hot water sensor
23 Condense trap

24 DHW ow switch

R Heating return connection

F Heating ow connection

G Gas connection
O Hot water outlet
I Cold water inlet

INTRODUCTION

INSTALLATION AND SERVICING INSTRUCTIONS

R F G O I

9

1.1 PRINCIPLE COMPONENTS

• A fully integrated electronic control board featuring electronic
temperature control, anti-cycle control, pump over-run, self­diagnostic fault indicator, full air/gas modulation

•

Aluminium heat exchanger

• Electronic ignition with ame supervision

• Integral high-head pump

• Fan

• Expansion vessel

• Water pressure switch

• Flue sensor

• Pressure gauge

• Safety valve

1.2 MODE OF OPERATION (at rest)

When the appliance is at rest and there are no requests for
heating or hot water, the following functions are active:

•

frost-protection system – the frost-protection system protects

the appliance against the risk of frost damage both for CH
and DHW. For CH line, if the main temperature falls to 5°C,
the appliance will function on minimum power until the tem­perature on main reaches 35°C.

Moreover if the DHW temperature falls to 5°C, the appliance

will function on minimum power until the temperature on main
reaches 55°C.

•

anti-block function – the anti-block function enables the pump

and divertor valve actuator to be energised for short periods,
when the appliance has been inactive for more than 24-hours.

1.3 MODE OF OPERATION (Heating)

When there is a request for heat via the 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 circuit to ensure ame stability

at the burner. Once successful ignition has been achieved, the
electronic circuitry increases the gas rate to 75% for a period of
15 minutes. Thereafter, the boiler’s output will either be increase
to maximum or modulate to suit the set requirement. When
the appliance reaches the desired temperature the burner will
shut down and the boiler will perform a three-minute anti-cycle
(timer delay).

When the request for heat has been satised the appliance

pump and fan may continue to operate to dissipate any residual
heat within the appliance.

1.4 MODE OF OPERATION (Hot water)

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.
Ignition is sensed by the electronic circuit to ensure ame stabil­ity at the burner. Once 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 exceeding the desired temperature
(set point) the burner will shut down until the temperature drops.

When the request for DHW has been satised the appliance

pump and fan may continue to operate to dissipate any residual
heat within the appliance.

Fig. 5

Expansion

vessel

Safety

valve

Pump

Return

temperature

sensor

Main heat

exchanger

Bottom

AAV

Pressure

switch

DHW heat
exchanger

Diverter

valve

Drain
valve

DHW tem-

perature

sensor

Flow temperature

sensor

Top AAV

Automatic

by-pass

DHW

non return

valve

CH

return

CH

ow

DHW

inlet

DHW
outlet

Flow regu-

lator

DHW ow

switch

SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE

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;

•

fan speed sensor to ensure safe operation of the burner;

• a high limit thermostat that over-rides the temperature control
circuit to prevent or interrupt the operation of the burner;

•

ame sensor that will shut down the burner when no ame

signal is detected;

•

ue sensor;

• a safety valve which releases excess pressure from the
primary circuit.

10

SECTION 2 - TECHNICAL DATA

2.1 Central Heating Vision 25C Vision 30C

Heat input (kW) 20.00 25.00

Maximum heat output (kW) 60/80°C 19.50 24.45

Minimum heat output (kW) 60/80°C 4.91 5.90

Maximum heat output (kW) 30/50°C 20.84 26.23

Minimum heat output (kW) 30/50°C 5.36 6.40

Minimum working pressure 0.25-0.45 bar

Maximum working pressure 2.5 bar

Minimum ow rate 350 l/h

2.2 Domestic Hot Water Vision 25C Vision 30C

Heat input (kW) 25.00 29.00

Flow Rate: ΔT35°C 10.20 12.0

Maximum inlet pressure 6 bar

Minimum inlet pressure 0.15 bar

Minimum ow rate 2 l/min

2.3 Gas Pressures Vision 25C Vision 30C

Inlet pressure (G20) 20.0 mbar 20.0 mbar

Heating maximum gas rate (m3/hr) 2.12 2.64

DHW maximum gas rate (m3/hr) 2.64 3.07

Minimum gas rate (m3/hr) 0.53 0.63

Injector size (mm) 5.1 5.6

Silencer ange (ø mm) (tted) 31 -

2.4 Expansion Vessel Vision 25C Vision 30C

Capacity 8 litres

Maximum system volume 74 litres

Pre-charge pressure 1 bar

2.5 Dimensions Vision 25C Vision 30C

Height (mm) 715

Width (mm) 405

Depth (mm) 248

Dry weight (kg) 27 28

2.6 Clearances Vision 25C Vision 30C

Sides 12mm

Top 150mm from casing or 25mm above ue elbow (whichever is applicable)

Bottom 150mm

Front 600mm

2.7 Connections Vision 25C Vision 30C

Flow & return 22mm

Gas 15mm

DHW hot & cold 15mm

Safety valve 15mm

Condense

21mm

2.8 Electrical Vision 25C Vision 30C

Power consumption (Watts) 110 11 9

Voltage (V/Hz) 230/50

Internal fuse 3.15A T (for PCB) - 3.15A F (for connections block)

External fuse 3A

2.9 Flue Details (concentric 60-100) Vision 25C Vision 30C

Maximum horizontal ue length (60/100mm) 5.85m 4.85m

Maximum vertical ue length (60/100mm) 6.85m 5.85m

2.9A Flue Details (concentric 80-125) Vision 25C Vision 30C

Maximum horizontal ue length (80/125mm) 15.3m 12.8m

Maximum vertical ue length (80/125mm) 20.3m

17.8m

2.9B Flue Details (twin pipes) Vision 25C Vision 30C

Maximum horizontal ue length (80mm/80mm) 45m/45m 40m/40m

Maximum vertical ue length (80mm/80mm) 45m/45m 40m/40m

11

Key Location Minimum distance

A Below an opening (window, air-brick, etc.) 300 mm
B Above an opening (window, air-brick, etc.) 300 mm
C To the side of an opening (window, air-brick, etc.) 300 mm
D Below gutter, drain-pipe, etc. 25 mm
E Below eaves 25 mm
F Below balcony, car-port roof, etc. 25 mm

G To the side of a soil/drain-pipe, etc. 25 mm (60mm for 80/125 - 5” ue)
H From internal/external corner 25 mm (60mm for 80/125 - 5” ue)

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 ashing As determined by the xed collar

of the vertical terminal
R To the side of a boundary 300 mm
S To the side of an opening or window on a pitched roof 600 mm
T Below an opening or window on a pitched roof 2000 mm
V From a vertical terminal to an adjacent opening (window, air-brick, etc.) (call Vokera technical for advice)
W From a vertical terminal to an adjacent vertical terminal 300 mm (only if both terminals are the same hight)

Fig. 6

2.12 PUMP DUTY

Fig. 6 shows the ow-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.

Fig. 7

Flow rate (l/h)

Residual head (x 100 mbar)

1st speed

2nd speed

3rd speed

0,0

1,0

2,0

3,0

4,0

5,0

6,0

0 100 200 300 400 500 600 700 800 900 1000

2.10 Efciency Vision 25C Vision 30C

SEDBUK (%) 90.0 90.2

2.11 Emissions Vision 25C Vision 30C

CO2 @ maximum output (%) 9.0 9.0

CO2 @ minimum output (%) 9.5 9.5

CO @ maximum output (ppm) 180 160

CO @ minimum output (ppm) 20 20

NOx rating class 5 class 5

12

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 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 authority, 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.

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.

BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION

BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART 1 APPLICATION, SELECTION, AND INSTALLTION OF EXPANSION VESSELS
AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

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-ued 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 ows 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 oors, 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 lling 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 of expansion from within

the system, generally this is sufcient, however if the system

has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).

3.6.6 FILLING POINT

A method for initial lling of the system and replacing water lost

during servicing etc. directly from the mains supply, should be

provided (see g. 8). This method of lling complies with the

current Water Supply (Water Fittings) Regulations 1999 and
Water Bylaws 2000 (Scotland). If an alternative location is

preferred, it should be connected as detailed in g. 8.

3.6.7 LOW PRESSURE SEALED SYSTEM

An alternative method of lling 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 g. 9).
The cold feed from the make-up vessel or tank must be tted

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.

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 ue 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 specically for this purpose. An existing com­partment/cupboard may be utilised provided that it is modied

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. Instal-

lation pipes must be tted 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
tightness in accordance with BS6891.
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 g. 7). 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 at roofs)

the terminal must be protected by a guard of durable material.

The guard must be tted centrally over the terminal. Refer to

13

This appliance must be installed by a competent person in

accordance with and dened by, the Standard Specication

(Domestic Gas Installations) Declaration (I.S. 813).

3A.1 RELATED DOCUMENTS

The installation of this boiler must be in accordance with the
relevant requirements of the local building regulations, the
current ETCI National Rules for Electrical Installations and the
bylaws of the local water undertaking.
It should be in accordance also with any relevant requirements
of the local and/or district authority.

3A.2 LOCATION OF APPLIANCE

The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements of
the current ETCI National Rules for Electrical 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.
The location chosen for the appliance must permit the provision

of a safe and satisfactory ue 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 de-

SECTION 3A - GENERAL REQUIREMENTS (EIRE)

3.6.8 FREQUENT FILLING

Frequent lling 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.

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 fused spur with a contact separation
of at least 3,5mm (3° high-voltage category). 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 MOUNTING ON A COMBUSTIBLE SURFACE

If the appliance is to be tted on a wall of combustible mate­rial, there is no requirement for a sheet of reproof material to

protect the wall.

3.9 TIMBER FRAMED BUILDINGS

If the appliance is to be tted in a timber framed building, it
should be tted in accordance with the Institute of Gas Engineers

publication (IGE/UP/7) ‘Guide for Gas Installations in Timber
Frame Buildings’.

3.10 INHIBITORS

Vokèra recommend that an 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 accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with BS 7593
and the Domestic Water Treatment Association’s (DWTA) code
of practice.

ow/return

pipe

control

valve

temporary

connection

control

valve

supply

pipe

double

check valve

Fig. 8

Fig. 9

Make-up vessel
or tank

Automatic
air-vent

Non-return

valve

Stopcock

5.0 metres minimum

Heating
return

3.11 SHOWERS

If the appliance is intended for use with a shower, the shower
must be thermostatically controlled and be suitable for use with
a combination boiler.

signed and constructed specically for this purpose. An exist­ing compartment/cupboard may be utilised provided that it is

modied to suit.

This appliance is not suitable for external installation.

3A.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. Instal-

lation pipes must be tted 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
tightness in accordance with I.S. 813.
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.

3A.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 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 at roofs)

14

the terminal must be protected by a guard of durable material.

The guard must be tted centrally over the terminal. Refer to

I.S. 813, when the terminal is 0.5 metres (or less) below plastic
guttering or 1 metre (or less) below painted eaves.

3A.5 AIR SUPPLY

The following notes are intended for general guidance only.

This appliance is a room-sealed, fan-ued 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.

3A.6 WATER CIRCULATION

Specic 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 ensure air

is carried naturally to air release points and that water ows

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 oors, 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

These must be located 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 lling 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 of expansion from within

the system, generally this is sufcient, however if the system

has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).

3A.6.6 FILLING POINT

A method for initial lling of the system and replacing water
lost during servicing etc. should be provided (see g. 8). You
should ensure this method of lling complies with the local water

authority regulations.

3A.6.7 LOW PRESSURE SEALED SYSTEM

An alternative method of lling 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 g. 9). The cold feed from
the make-up vessel or tank must be tted 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 lling 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.

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
complete isolation from the supply. The preferred method is by
using a double-pole switch fuse spur with a contact separation
of at least 3,5 mm (3° high-voltage category). 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 tted on a wall of combustible mate­rial, there is no requirement for a sheet of reproof material to

protect the wall.

3A.9 TIMBER FRAMED BUILDINGS

If the appliance is to be tted in a timber framed building, it
should be tted 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 Frame Buildings’ gives specic

advice on this type of installation.

3A.10 INHIBITORS

Vokèra recommend that an 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 accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with I.S. 813
and the Domestic Water Treatment Association’s (DWTA) code
of practice.

3A.11 SHOWERS

If the appliance is intended for use with a shower, the shower
must be thermostatically controlled and be suitable for use with
a combination boiler.

3A.12 DECLARATION OF CONFORMITY

A Declaration of Conformity (as dened 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.

15

Fig. 11

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 oor with the writing the correct way up.

4.2 CONTENTS

Contained within the carton is:

• the boiler

• the wall bracket

• carton template

• an accessories pack containing appliance service connections

and washers

• the instruction pack containing the installation, servicing & user
instructions, guarantee registration card and a 3-amp 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. Protective gloves should
be used to lift the appliance, the appliance back-frame should
be used for lifting points.

4.4 PREPARATION FOR MOUNTING THE AP-

PLIANCE

The appliance should be mounted on a smooth, vertical, non­combustible 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 g. 10) and ue-hole (if applicable).

4.5 FITTING THE FLUE

The top ue outlet permits both horizontal and vertical ue ap­plications to be considered, alternatively, the Vokèra twin ue
system can be utilised if longer ue runs are required.

4.5.1 CONCENTRIC HORIZONTAL FLUE

(For concentric vertical ue, see 4.5.2).
(For twin ue applications, see 4.5.3).

The appliance can be used with either the Vokèra condensing

60/100mm concentric ue system or the optional 80/125mm
concentric ue system.

NOTE
These instructions relate only to the Vokèra condensing

60/100mm concentric ue system. For specic details on the
installation of the 80/125mm concentric ue system please refer
to the instructions supplied. The appliance ue outlet elbow can
be rotated through 360º on its vertical axis. In addition the ue

may be extended from the outlet elbow in the horizontal plane
(see 2.9). A reduction must also be made to the maximum length
(see table below) when additional bends are used.

Reduction for additional bends

Bend Reduction in maximum ue length for each bend

45º bend 1.3 metre (60/100) - 1.0 metre (80/125)
90º bend 1.6 metre (60/100) - 1.5 metre (80/125)

Horizontal ue terminals and accessories

Part No. Description Length

29450120 Horizontal ue kit 900mm
29450121 Telescopic ue kit 350/530mm

522 Plume management kit 1370mm
29450123 90-degree bend N/A
29450124 45-degree bends (pair) N/A
29450125 500mm extension 500mm
29450126 1000mm extension 1000mm

29450127 2000m extension 2000mm
29450128 Telescopic extension 350/730mm
529 Wall bracket pack (5) 208mm

Using the template provided (A), mark and drill a 125mm hole

for the passage of the ue pipe. The hole should be drilled
to ensure any condense uid that forms, is allowed to drain
back to the appliance (see g. 12-15). The xing holes for the

wall-mounting bracket should now be drilled and plugged, an

appropriate type and quantity of xing 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 TELESCOPIC HORIZONTAL FLUE KIT

In some instances It may necessary to cut the inner 60mm pipe

of the ue bend at the point indicated (g.13 pos. A) to allow
for easier insertion to the boiler ue spigot.

FITTING THE HORIZONTAL FLUE KIT

Carefully measure the distance from the centre of the appliance

ue outlet to the edge of the nished outside wall (dimension

X). Add 65mm to dimension X to give you Dimension Y (see

g 12). Measure dimension Y from the terminal end of the con­centric ue pipe and cut off the excess ensuring any burrs are
removed. Pass the concentric ue pipe through the previously
drilled hole. Fit the ue bend to the boiler ue outlet and insert
the concentric ue pipe into the ue bend ensuring the correct

seal is made. Using the clamp, gasket, and screws supplied,

secure the ue bend to the appliance ue spigot.

NOTE

Fit the internal (white) trim to the ue assembly prior to con­necting the ue pipe to the bend.
You must ensure that the entire ue system is properly sup­ported and connected. Seal the ue assembly to the wall using

cement or a suitable alternative that will provide satisfactory

weatherproong. The exterior trim can now be tted.

SECTION 4 - INSTALLATION

Fig. 10

A

Terminal or
extension

Outer clamps

16

Fig.13

EXTENDING THE FLUE

Connect the bend – supplied with the terminal kit – to the top

of the boiler using clamp (supplied) see g. 11. The additional
bends & extensions have push-t connections, care should be

taken to ensure that the correct seal is made when assembling

the ue system. Connect the required number of ue exten­sions or bends (up to the maximum equivalent ue length) to
the ue terminal (see g. 11-14). The ue system should have

a minimum of 1º; maximum of 3º rise from the boiler to outside,

to ensure any condense uid that forms, is allowed to drain

back to the appliance.

NOTE

When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the extension

(see g. 11-14). Remove any burrs, and check that all seals are
located properly. You must ensure that the entire ue system is
properly supported and connected. Seal the ue assembly to

the wall using cement or a suitable alternative that will provide

satisfactory weatherproong. The interior and exterior trim can
now be tted.

Fig. 14

A

4.5.1.2 FITTING THE REAR FLUE (g. 15) (rear ue outlet

only)

Using the template provided, mark and drill a 125mm hole

for the passage of the ue pipe. The hole should be drilled
LEVEL to ensure any condense uid that forms, is allowed
to drain back to the appliance. The xing holes for the wall-

mounting bracket should now be drilled and plugged, an ap-

propriate type and quantity of xing should be used to ensure

that the bracket is mounted securely. Once the bracket has

been secured to the wall, attach the rear ue terminal to the
appliance (using the previously retained screws) and x the

telescopic terminal to the correct length (wall thickness) en­suring that the terminal will protrude through the wall by the
correct distance. At this point, lift the appliance and carefully
insert the terminal into and through the wall, ensuring that the
holes in the appliance back frame are aligned with the studs
on the wall bracket.

Fig.15

Fig.17

Using the screws and washers provided, secure the appliance
onto the wall bracket and tighten with a suitable spanner.

Seal the ue assembly to the wall using cement or a suitable
alternative that will provide satisfactory weatherproong. The
exterior wall trim can now be tted.

Fig.16

Fig. 12

Part No. Description Length
29450133 Rear ue terminal 825mm

17

4.5.2 CONCENTRIC VERTICAL FLUE

The appliance can be used with either the Vokèra condensing

60/100mm concentric ue system or the optional 80/125mm
concentric ue system.

NOTE
These instructions relate only to the Vokèra condensing

60/100mm concentric ue system. For specic details on the
installation of the 80/125mm concentric ue system please refer

to the instructions supplied.

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

Reduction for bends

Bend Reduction in maximum ue length for each bend

45º bend 1.3 metre (60/100) - 1.0 metre (80/125)
90º bend 1.6 metre (60/100) - 1.5 metre (80/125)

Vertical ue terminal and accessories

Part No. Description Length

29450122 Vertical ue terminal 1000mm
531 Pitched roof ashing plate N/A
532 Flat roof ashing plate N/A

29450123 90-degree bend N/A
29450124 45-degree bends (pair) N/A
29450125 500mm extension 500mm
29450126 1000mm extension 1000mm
29450127 2000mm extension 2000mm
29450128 Telescopic extension 350/730mm
529 Wall bracket pack (5) 208mm

Using the dimensions given in g. 18 as a reference, mark and

cut a 125mm hole in the ceiling and/or roof.

Fig. 18

“X”

12/15/20HE = 202mm
25/30/35HE = 218mm

130mm

Fit the appropriate ashing plate to the roof and insert the ver­tical ue terminal through the ashing plate from the outside,
ensuring that the collar on the ue terminal ts over the ashing.
The xing holes for the wall-mounting bracket should now be
drilled and plugged, an ‘appropriate type and quantity of xing

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.

IMPORTANT

The vertical ue 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.
Connect the vertical ue assembly to the boiler ue spigot us­ing the 100mm clip, gasket & screws (supplied), ensuring the

correct seal is made. The ue support bracket (supplied with
the vertical ue kit) can now be tted.
If the vertical ue requires extension/s or additional bend/s,
connect the required number of ue extensions or bends (up
to the maximum equivalent ue length) between the boiler and
vertical ue assembly (see g. 14).
Ensure that any horizontal sections of the ue system have a

minimum 1º; maximum 3º fall back to the boiler (1º = 17mm
per 1000mm).

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 burrs, and check that any seals are located
properly.
You must ensure that the entire ue system is properly sup­ported and connected.

4.5.3 TWIN FLUE SYSTEM

The Vokèra twin ue system enables greater ue distances
to be achieved than that of a concentric ue system. It can be

used for horizontal or vertical applications, however the twin

ue system must be converted to the dedicated concentric
ue kit for termination. It is essential that the installation of the
twin ue system be carried out in strict accordance with these

instructions.

GUIDANCE NOTES ON TWIN FLUE INSTALLATION

• The ue must have a have a minimum 1º; maximum 3º (1º =

17mm per 1000mm) fall back to the appliance to allow any

condensate that may form in the ue system to drain via the

condensate 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 ue system is adequately supported,

use at least one bracket for each extension.

• As the exhaust outlet pipe can reach very high temperatu­res it must be protected to prevent persons touching the hot
surface.

• The condensate drain pipe must be connected in accordan­ce with building regulations

Reduction for bends

Bend Reduction in maximum ue length for each bend

45º bend 1.0 metre
90º bend 1.5 metre

Twin ue accessories

Part No. Description Length

0225805 Horizontal ue terminal 1.0 metre
0225810 Vertical ue terminal 1.0 metre

359 Twin adapter kit N/A

531 Pitched roof ashing plate N/A
532 Flat roof ashing plate N/A

0225815 Condensate drain kit N/A
0225820 0.25m extension (pair) 250mm
0225825 0.5m extension (pair) 500mm
0225830 1.0m extension (pair) 1000mm
0225835 2.0m extension (pair) 2000mm
0225840 45º bend (pair) N/A
0225845 90º bend (pair) N/A
0225850 Twin bracket (5) N/A
0225855 Single bracket (5) N/A

MOUNTING THE BOILER

The xing holes for the wall-mounting bracket should now be
drilled and plugged, an appropriate type and quantity of xing

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.

18

NOTE

Seal the ue terminal assembly to the wall using cement or a

suitable alternative that will provide satisfactory weatherproof-

ing. The interior and exterior trim can now be tted.

VERTICAL TERMINATION (g. 18)

The twin ue system must be converted to the dedicated con­centric ue 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 preferable to install the

terminal assembly prior to tting the twin ue pipes.
Fit the appropriate ashing plate to the roof and insert the ver­tical ue terminal through the ashing plate from the outside,
ensuring that the collar on the ue terminal ts over the ashing.
Push-t the twin ue 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 ue pipes to

allow connection to the concentric to twin converter.

NOTE

• Before cutting twin ue pipes ensure allowances have been

made for connection onto the previous piece and onto the

concentric to twin converter. The last twin ue pipes must

be pushed 50mm onto the male spigots of the concentric to
twin converter.

• You must ensure that the entire ue system is properly sup-
ported and connected.

• Ensure that any horizontal sections of pipe have a fall
of between 1 & 3º towards the appliance (1º =17mm per
1000mm).

Fig. 21

Fig. 22

Fig. 19

HORIZONTAL TERMINATION (g. 21)

The twin ue system must be converted to the dedicated con­centric ue kit for termination.

• The horizontal terminal is supplied with a built-in converter
box and cannot be shortened.

• A 130mm hole is required for the passage of the concentric
terminal through the wall.

• The air inlet pipe must always be level with or below, that of
the exhaust pipe.

Depending on site conditions it may be preferable to install the

terminal assembly prior to tting the twin ue pipes.

Mark and drill a level 130mm hole for the passage of the horizontal

ue terminal. Insert the terminal assembly into the ue hole.
Push-t the twin ue 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 ue pipes to

allow connection to the concentric to twin converter.

NOTE

Before cutting twin ue pipes ensure allowances have been

made for connection onto the previous piece and onto the

concentric to twin converter. The last twin ue pipes must be

pushed 50mm onto the male spigots of the concentric to twin
converter.

INSTALLATION OF TWIN ADAPTOR KIT (g. 19 & 20)

•

Insert the exhaust connection manifold (A) onto the appliance

ue outlet.

• Remove the blanking plate (located to the left of the appliance

ue outlet) and – using the same screws – install the air inlet

plate (B).

• Using the hole in the exhaust connection manifold as a guide,

drill a 3mm hole in the appliance ue spigot and secure the
exhaust manifold connection to the ue spigot using the screw

provided (C).

• Using the two holes in the air inlet plate as a guide, drill a
3mm hole in each and secure the air inlet pipe/bend using
the screws provided.

The twin ue pipes extensions and accessories can now be

installed by pushing together (the plain end of each extension
or bend should be pushed approximately 50mm into the female
socket of the previous piece).

B

A

C

Fig. 20

1-deg = 17mm

19

4.6 CONNECTING THE GAS AND WATER

The appliance is supplied with an accessory pack that includes
service valves. The service valves are of the compression type.
The accessory pack contains sealing washers’ etc, for use with
the service valves. When connecting pipe work to the valves,
tighten the compression end rst 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 (g. 23)

The appliance is supplied with a 15mm service valve, connect
a 15mm pipe to the inlet of the valve and tighten both nuts.

NOTE

It will be necessary to calculate the diameter of the gas supply
pipe to ensure the appliance has an adequate supply of gas.

4.6.2 FLOW & RETURN (g. 23)

The appliance is supplied with 22mm service valves for the

ow and return connections, connect a 22mm pipe to the inlet

of each valve and tighten both nuts.

NOTE

Depending on system requirements, it may necessary to in-

crease the size of the ow & return pipe work after the service

valve connections.

4.6.3 COLD WATER INLET (g. 23)

The appliance is supplied with a 15mm stopcock, connect a
15mm pipe to the inlet of the stopcock and tighten both nuts.

4.6.4 HOT WATER OUTLET (g. 23)

The appliance is supplied with a 15mm outlet connection, con­nect a 15mm pipe to the outlet connection and tighten both nuts.

4.6.5 SAFETY VALVE (g. 23)

Connect the safety valve connection pipe to the safety valve
outlet and tighten. The discharge pipe must have a continuous fall
away from the appliance to outside and allow any water to drain
away thereby eliminating the possibility of freezing.
The discharge pipe must terminate in a position where any water

- possibly boiling - discharges safely without causing damage or
injury, but is still visible.

4.6.6 CONDENSE PIPE

During normal operation the boiler produces condense which
is collected in a trap located in the lower part of the boiler. A

exible pipe (condense outlet pipe) is connected to the outlet
of the trap. The exible 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 should
be insulated to prevent the risk of freezing.

4.6.7 CONNECTING THE CONDENSATE OUTLET

Gently pull the condense outlet pipe down from its location
inside the boiler until approximately 100mm protrudes from the
underside of the boiler, care should be taken to ensure that the
pipe connection to the trap remains secure. Connect a suitable
plastic (not copper) pipe (no less than 21mm diameter) to the
outlet pipe and ensure it discharges in accordance with local
building regulations or other rules in force.

4.7 ELECTRICAL CONNECTIONS

The boiler is supplied with a 2-metre y-lead. This lead can

be used for connection to the electrical supply. Connect the

y-lead to a fused plug or fused isolator in the following way:

•

brown wire to LIVE supply

• blue wire to NEUTRAL supply

• green/yellow to EARTH connection.

Insert the supplied 3-AMP fuse into the fused isolator or fused plug.

Should the y-lead be unsuitable, refer to 4.7.3 for details on

how to connect the electrical supply directly to the boiler.

The electrical supply must be as specied in section 3/3A.
A qualied electrician should connect the appliance to the

electrical supply. 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. ANY EXTERNAL CONTROL OR WIRING
MUST BE SERVED FROM THE SAME ISOLATOR AS THAT
OF THE APPLIANCE. The supply cable from the isolator to the

appliance must be 3-core exible sized 0.75mm to BS 6500 or

equivalent. Wiring to the appliance must be rated for operation
in contact with surfaces up to 90 ºC.

Fig. 23

4.7.1 CASING REMOVAL (g. 24)

To gain internal access to the appliance you must rst remove
the casing, proceed as outlined below:

•

locate and unscrew the 2-screws (A) that secure the outer

casing to the appliance

lift the casing upward to disengage it from the top locating

hooks and then remove

•

store the casing and screws safely until required. Re-t in

the reverse order

•

remove the screw below the control fascia and gently lower

it until it rests.

4.7.2 APPLIANCE TERMINAL BLOCK

The appliance terminal block is located on the rear of the control
fascia. Remove the casing as described in 4.7.1. Gently pull
the control panel forwards and down. Locate the terminal block

cover (g. 25).

NOTE

The appliance comes with a factory tted link (‘TA’) to allow

basic operation of the boiler via the mode selector switch. If it is
anticipated that external controls will be required please refer to
the wiring diagrams in section 8 for more detailed information.

4.7.3 CONNECTING THE MAINS (230V) INPUT

Unhook and remove the terminal block cover (230V). Pass the
cable through the cable anchorage point. Connect the supply
cable wires (LIVE, NEUTRAL, & EARTH) to their corresponding
terminals (L, N, & E) on the appliance – high voltage – terminal
block. When connecting the EARTH wire, ensure that it’s left
slightly longer that the others, this will prevent strain on the
EARTH wire should the cable become taut. Do not remove the

link wire unless additional external controls are to be tted (see

section 8). The securing screw on the cable anchorage should
now be tightened. This must be done before the terminal block

cover is re-tted in its position.

NOTE

It is the installer’s responsibility to ensure that the appliance is
properly Earthed. Vokèra Ltd. cannot be held responsible for any
damages or injuries caused as a result of incorrect Earth wiring.

Fig. 24

A

Fig. 25

Hot water outlet

Cold water inlet

stopcock

Gas

cock

C/H ow

valve

C/H return

valve

Safety valve outlet

20

5.1 GAS SUPPLY INSTALLATION

Inspect the entire installation including the gas meter, test for
tightness and purge. Refer to BS 6891 (I.S. 813 in ROI) for

specic instruction.

5.2 THE HEATING SYSTEM

The appliance contains components that may become damaged
or rendered inoperable by oils and/or debris that are residual
from the installation of the system, consequently it is essential

that the system be ushed in accordance with the following

instructions.

5.3 INITIAL FILLING OF THE SYSTEM

Ensure both ow and return service valves are open, remove

appliance casing as described in 4.7.1, identify the automatic air
release valves (AAV) and loosen the dust cap/s by turning the
cap anti-clockwise one full turn. Ensure all manual air release
valves located on the heating system are closed. Connect the

lling loop as shown in g. 8, slowly proceed to ll the system
by rstly opening the inlet valve connected to the ow pipe, and
then turning the lever on the ll valve, to the open position. As

water enters the system the pressure gauge will begin to rise.
Once the gauge has reached 1 BAR close both valves and begin

venting all manual air release valves, starting at the lowest rst.

It may be necessary to go back and top-up the pressure until

the entire system has been lled. Inspect the system for water

tightness, rectifying any leaks.

5.3.1 MANUAL AIR RELEASE (g. 26)

When the boiler has been lled for the rst time or the system
has been drained and relled, it will be necessary to release

any air that may have become trapped within the appliance heat
exchanger. Slacken the bleed screw until water is released
and then close.

IMPORTANT, THERE ARE NO OTHER MANUAL AIR RE­LEASE VALVES LOCATED ON THE APPLIANCE.

5.4 INITIAL FLUSHING OF THE SYSTEM

The whole of the heating system must be ushed both cold

and hot as detailed in 5.8. Open all radiator or heating valves

and the appliance ow & return service valve. 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. Rell the boiler and heating system as described in 5.3.

5.5 PRE-OPERATION CHECKS

Before attempting the initial lighting of the appliance, the fol­lowing checks must be carried out:

•

ensure all gas service valves from the meter to the appliance

are open and the supply pipe has been properly purged;

•

ensure the proper electrical checks have been carried out,

(see 7.8) particularly continuity, polarity and resistance to
earth;

Fig. 26

• ensure the 3 AMP fuse – supplied with the appliance – has

been tted;

•

ensure the system has been lled, vented and the pressure

set to 1 BAR;

•

ensure the ue system has been tted properly and in ac-

cordance with the instructions;

•

ensure all appliance service valves are open.

5.6 INITIAL LIGHTING

Ensure the electrical supply to the appliance is switched on.
Ensure any external controls are switched to an ‘ON’ position
and are calling for heat. Move the selector switch to the ON
position, the appliance will now operate as described in 1.2.
Should the appliance fail to ignite, refer to 5.6 and/or section 7

(mode of operation & fault nding).

5.7 CHECKING GAS PRESSURE AND COMBUS­TION ANALYSIS

The appliance is factory set and requires no additional adjust­ment once installed. However to satisfy the requirements of
GSIUR 26/9 (I.S. 813 ROI), it will be necessary to gas rate
the appliance using the gas meter that serves the appliance.
If the installation does not include a gas meter (for example
LPG) and there are no means by which to calculate the gas
rate, then a combustion analysis test must be carried out in
accordance with BS 7967 (UK) to ensure the appliance is left
working safely and correctly.
Additionally, if the gas valve has been adjusted, replaced, or the
appliance has been converted for use with another gas type,
then it becomes necessary to carry out a combustion analysis/
check to ensure that correct combustion is occurring.
If there are no means to gas rate the appliance and/or carry
out a combustion analysis check, then it will not be possible to
complete the commissioning procedure.
Details on how to carry out the combustion analysis can be
found in section 7.

IMPORTANT

It’s imperative that a sufcient dynamic – gas – pressure is

maintained at all times. Should the dynamic gas pressure fall
below an acceptable level, the appliance may malfunction or
sustain damage.

5.8 FINAL FLUSHING OF THE HEATING SYSTEM

The system shall be ushed in accordance with BS 7593 (I.S.

813 ROI). Should a cleanser be used, it must be suitable for
Aluminium heat exchangers. It shall be from a reputable manu­facturer and shall be administered in strict accordance with the
manufacturers’ instructions and the DWTA code of practice.

NOTE

Chemicals used to cleanse the system and/or inhibit corrosion
must be pH neutral, i.e. they should ensure that the level of the
pH in the system water remains neutral. Premature failure of
certain components can occur if the level of pH in the system
water is out-with normal levels.

5.8.1 INHIBITORS

See Section 3 “General Requirements”.

5.9 SETTING THE FLOW OUTLET TEMPERA­TURE

The ow outlet temperature can be adjusted between 40 °C -

80 °C for standard CH system by using the Heating thermostat

knob (see g.1).

5.9.1 SETTING THE DHW OUTLET TEMPERATURE

The DHW outlet temperature can be adjusted between 37 °C

- 60 °C via the DHW thermostat knob (see g.1).

5.10 SETTING THE SYSTEM DESIGN PRESSURE

The design pressure should be a minimum of 0.5 BAR and a
maximum of 1.5 BAR. The actual reading should ideally be 1
BAR plus the equivalent height in metres (0.1 BAR = 1 metre) to
the highest point in the system above the base of the appliance
(up to the maximum of 1.5 BAR total). N.B. The safety valve
is set to lift at 3 BAR/30 metres/45 psig. To lower the system

SECTION 5 - COMMISSIONING

21

6.1 GENERAL

To ensure the continued safe and efcient operation of the ap­pliance, it is recommended that it is checked and serviced at
regular intervals. To ensure correct and safe operation of the
appliance, it is essential that any worn or failed component be
replaced only with a genuine Vokèra spare part. It should be
remembered that although certain generic components may

look similar, they will be specic to an individual appliance or

product range. Use of non-genuine Vokèra spare parts could
invalidate your warranty and may pose a potential safety haz­ard. The frequency of servicing will depend upon the particular
installation conditions, but in general, once per year should be

sufcient. It is the law that any servicing work is carried out by

competent person such as a Vokèra engineer, an approved
service agent, British Gas, GAS SAFE registered personnel
or other suitably qualied personnel. The following instruc­tions apply to the appliance and its controls, but it should be
remembered that the central heating and the domestic hot
water systems would also require attention from time to time.

6.2 ROUTINE ANNUAL SERVICING

• Check the operation of the appliance and ensure it functions

as described in section 7.

• Compare the performance of the appliance with its design
specication. The cause of any noticeable deterioration
should be identied and rectied without delay.

• Thoroughly inspect the appliance for signs of damage or
deterioration especially the ue system and the electrical

apparatus.

• Check and adjust – if necessary – all burner pressure settings

(see 7.4).

• Check and adjust – if necessary – the system design pres­sure (see 5.10).

• Carry out an analysis of the ue gases (see 7.3), and visually

pressure to the required value, drain off some water from the

appliance drain valve until the required gure registers on the
pressure gauge (see g. 1).

5.11 REGULATING THE CENTRAL HEATING

SYSTEM

Fully open all radiator and circuit valves and run the appliance
for both heating and hot water until heated water is circulating.
If conditions are warm remove any thermostatic heads. Adjust
radiator return valves and any branch circuit return valves
until the individual return temperatures are correct and are
approximately equal.

5.11.1 REGULATING THE DHW FLOW-RATE

The appliance is tted with a ow rate restrictor that limits the
maximum ow rate that can be drawn through the appliance.

The restrictor eliminates the need to manually adjust the DHW

ow rate. However if it is felt necessary to further increase or
decrease the available ow rate, spare restrictors are available

from Vokèra spare parts.

The spare ow rate restrictors can be tted to either increase
or decrease the maximum ow rate.

5.11.2 FLOW-RATE RESTRICTOR

The boiler is supplied with the following ow restrictor.

Vision 25C: 8 - litres ow restrictor
Vision 30C: 10 - litres ow restrictor

5.12 FINAL CHECKS

• ENSURE ALL TEST NIPPLES ON THE APPLIANCE GAS
VALVE ARE TIGHT AND CHECKED FOR TIGHTNESS.

• ENSURE THE APPLIANCE FLUE SYSTEM IS FITTED
CORRECTLY AND IS PROPERLY SECURED.

• ENSURE ALL PIPE WORK IS RE-CHECKED FOR TIGHT­NESS.

• RE-FIT APPLIANCE CASING.

• COMPLETE BENCHMARK CHECKLIST.

FOR UK ONLY

Complete details of the boiler, controls, installation and commis­sioning in the Benchmark checklist at the back of this book. It is
important that the Benchmark checklist is correctly completed
and handed to the user. Failure to install and commission the
appliance to the manufacturers instructions may invalidate the
warranty.

5.13 INSTRUCTING THE USER

Hand over all documentation supplied with this appliance –
including these instructions – and explain the importance of
keeping them in a 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 any
associated controls correctly.

Show the user the location of the lling valve and how to top-

up the system pressure correctly and show the location of all
manual air release points.
Explain to the user how to turn off the appliance for both long
and short periods and advise on the necessary precautions to
prevent frost damage.

Explain to the user that for continued safe and efcient operation,

the appliance must be serviced annually by a competent person.

IMPORTANT

To validate the appliance warranty, it’s necessary to register
the appliance details with us. The warranty can be registered
in several ways:

• by completing the warranty registration card and posting to
us using the envelope supplied

• online at: vokera.co.uk

• for UK residents by calling: 0870 607 0281

• for ROI residents by calling: 056 6655057.

SECTION 6 - SERVICING INSTRUCTIONS

check the condition of the entire ue assembly.

• Compare the results with the appliance design specication.
Any deterioration in performance must be identied and recti­ed without delay.

• Check that the main heat exchanger is clean and free from

any debris or obstruction.

• Check and clean – if necessary – the condense trap to ensure

correct operation.

The ame side of the burner is made of state-of-the-art material.

Being fragile:

- be particularly careful when handling, mounting or dismantling
the burner and adjacent components (e.g. electrodes, insula­tion panelling etc.)

- avoid direct contact with any cleaning appliance (e.g. brushes,
aspirators, blowers, etc.).

This component does not need any maintenance, please do
not remove it from its housing, except where the O-ring may
have to be replaced.
The manufacturer declines all responsibility in cases of damages
due to failing to observe the above.

6.3 REPLACEMENT OF COMPONENTS

Although it is anticipated that this appliance will give years of
reliable, trouble free service, the life span of components will be
determined by factors such as operating conditions and usage.

Should the appliance develop a fault, the fault nding section

will assist in determining which component is malfunctioning.

6.4 COMPONENT REMOVAL PROCEDURE

To remove a component, access to the interior of 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 described
in section 4.7.1 and drain the water content from the appliance

22

Fig. 27

Fig. 28

Fig. 29

A

B

C

D

E

F

I

J

Fig. 30

Fig. 31

M

N

I2

J2

G H

Fig. 32

O

P

K

L

via the drain 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 TIGHTNESS IF ANY

GAS CARRYING COMPONENTS HAVE BEEN REMOVED
OR DISTURBED.

6.4.1 AIR BOX FRONT COVER REMOVAL (g. 27)

Locate the 4 screws and remove air box front cover.

6.5 PUMP ASSEMBLY (g. 28)

Carry out component removal procedure as described in 6.4.
Disconnect and remove the pump outlet pipe (A) from the pump
assembly/combustion chamber connection.
Remove the expansion pipe locking pin (B) from the top of the

pump assembly and withdraw the exible pipe. Locate and

remove the pressure gauge securing pin (C) and disconnect
the pressure gauge from the pump assembly. Disconnect the
electrical wiring from the pump’s electrical connection point (D).
Locate and remove the 2 securing screws (E) at the rear of the
pump assembly. Remove locking pin (F) from pump base and
lift pump assembly clear of the hydraulic manifold. The pump
assembly can now be removed from the appliance. Replace
carefully in the reverse order.

6.6 SAFETY VALVE (g. 29)

Carry out component removal procedure as described in 6.4.
Disconnect the outlet pipe (G) from the safety valve, remove
safety valve locking pin (H) from the hydraulic manifold. Replace
in the reverse order.

6.7 LOWER AUTOMATIC AIR RELEASE VALVE

(g. 28)

Carry out component removal procedure as described in 6.4.
Remove the expansion pipe locking pin (B) from the pump as­sembly and remove the expansion pipe. Locate and remove
the AAV locking pin (I) from the pump assembly and remove
the AAV assembly (J). Replace in the reverse order.

6.7.1 TOP AUTOMATIC AIR RELEASE VALVE (g. 30)

Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front cover. Remove the
AAV locking pin (K) from the deaerator assembly and remove
the AAV assembly (L). Replace in the reverse order.

6.8 WATER PRESSURE SWITCH (g. 31)

Carry out component removal procedure as described in 6.4.
Locate and remove the locking pin (M) from the water pressure
switch (N). Remove the wiring. Carefully withdraw the switch.
Replace in the reverse order.

6.9 FLOW THERMISTOR (g. 4 - pos. 17)

Carry out component removal procedure as described in 6.4.

Unclip and remove the air chamber front cover. Unclip the ow
thermistor from the ow outlet pipe. Disconnect thermistor

electrical plug. Replace in the reverse order.

6.10 RETURN THERMISTOR (g. 4 - pos. 20)

Carry out component removal procedure as described in 6.4.
Unclip the return thermistor from the return inlet pipe. Discon­nect thermistor electrical plug. Replace in the reverse order.

6.11 PRINTED CIRCUIT BOARD (g. 32)

Carry out component removal procedure as described in 6.4.
Pull the control fascia forward and lower it. Push the clips (O)
which secure the PCB cover, remove cover, after carefully tak-

ing note of all wiring connections and jumper tag conguration.

Unhook and remove connection block (P). Disconnect all wiring

23

6.14 FLUE FAN & MIXER (g. 35-36)

Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Locate and remove the
gas pipe locking pin (A1) and swing/rotate the gas pipe away
from the fan assembly (B1), (if necessary unscrew the gas
pipe from the gas valve G1). Locate and slacken the silencer
(H1). Locate and remove the sense electrode. To remove the
fan (E1), disconnect the electrical connections attached to
the fan, locate and remove the four screws (F1). Gently ease
the fan from its location. To remove the mixer (C1) locate and
remove the three screws (D1), the mixer can be removed after
the fan removal. Replace in the reverse order. Ensure all seals
are in good condition, taking care to ensure they are replaced
correctly.

6.15 BURNER (g. 35)

Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Locate and remove the
gas pipe locking pin (A1) and swing/rotate the gas pipe away
from the fan assembly (B1), (if necessary unscrew the gas
pipe from the gas valve G1). Locate and slacken the silencer
(H1), disconnect the electrical connections attached to the
fan. Disconnect the electrode leads and ancillary wiring from
their respective connectors. Locate and remove the screws
(I1) which secure the burner assembly in position to the heat
exchanger (J1). Gently ease the fan assembly out of its loca­tion. Once the assembly has been removed, the burner (K1)
can be withdrawn from the heat engine. Ensure the seals (L1)
are in good condition, taking care to.

Fig. 34

6.13 ELECTRODES (g. 34)

Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Disconnect the electrode
leads and ancillary wiring from their respective connectors. Re­move the retaining screws (V) for electrode. Remove the spark
ignition electrode (W). Remove the ame sensor electrod (Y).

6.12 GAS VALVE (g. 33)

Carry out component removal procedure as described in 6.4.
The gas valve must be changed as complete unit. Disconnect
the electrical plug and leads from the gas valve, slacken and
unscrew gas valve inlet and outlet connections. Please note,
the sealing washers (Q) must be discarded and replaced with
new sealing washers. Disconnect the compensation pipe (R).
Unscrew gas pipe connections (S-T), the gas valve can now
be removed. Replace in the reverse order. Check and adjust
burner pressure settings.

WARNING, A GAS TIGHTNESS CHECK MUST BE CAR­RIED OUT.

6.12.1 INJECTOR (g. 33)

Carry out component removal procedure as described in 6.4.
Unscrew and remove gas pipe connections (S-T). Locate and
remove the injector (U) inside the valve. Replace in the reverse
order. Check and adjust burner pressure settings.

WARNING, A GAS TIGHTNESS CHECK MUST BE CAR­RIED OUT.

Q

Q

U

S

T

C1

D1

E1

F1

V

Y

W

H1

I1

J1

K1

L1

L1

Fig. 33

V

W

Y

Fig. 35

from the PCB, locate and remove the PCB securing screws,
remove the required PCB. Replace in the reverse order ensur­ing that the position of the 2 control knobs are correctly aligned
with the respective potentiometers on the PCB.

Ensure that the correct jumper tag conguration has been

respected. It will be necessary to check the functioning of the
PCB is set for the correct boiler type/application.

R

24

Fig. 36

A1

B1

G1

M1

N1

O1

P1

J1

Fig. 37

Q1

T1

S1

R1

Fig. 39

Fig. 38

W1

V1

U1

6.16 MAIN HEAT EXCHANGER (g. 36)

Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Locate and remove the
gas pipe locking pin (A1) and swing/rotate the gas pipe away
from the fan assembly (B1), (if necessary unscrew the gas pipe
from the gas valve G1). Disconnect the electrical connections
attached to the fan. Disconnect the electrode leads and ancil­lary wiring from their respective connectors.
Disconnect the ow locking pin (N1), return locking pin (M1)
on the heat exchanger. Locate and remove the 4-screws that
secure the heat exchanger to the combustion chamber (O1).

Move the heat exchanger and disconnect it from the ue collector

(P1). The heat exchanger can now be lifted up and withdrawn
from the appliance.
Replace in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced correctly.

6.17 AUTOMATIC BY-PASS & DHW NON-RETURN

Carry out component removal procedure as described in 6.4.
Remove the locking pin (Q1) that secures the cover (R1) to
the hydraulic manifold. Using a hooked piece of wire, carefully
withdraw the by-pass cartridge (S1) and/or DHW non-return
cartridge (T1). Ensure all seals are in good condition, taking
care to ensure they are replaced correctly. Replace in the
reverse order ensuring the cartridge is facing the correct way.

6.18 EXPANSION VESSEL REMOVAL (g. 38)

Carry out component removal procedure as described in

6.4. Disconnect the exible expansion pipe from the vessel.

Unscrew the nut that secures the vessel to the lower frame.
Locate and remove the screw (U1) that secures the vessel to
the top. The expansion vessel can now be removed. Replace
in the reverse order. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.

6.19 CONDENSE TRAP REMOVAL (g. 39)

Carry out component removal procedure as described in 6.4.
Disconnect the the locking pin (V1) that secures the trap to
the air condense pipe. Disconnect the lower rubber condense
pipe from the condense trap. Carefully remove the condense
trap. For cleaning unlock the upper and lower closing plug (W1).
Replace in the reverse order.

25

G2

Fig. 42

Fig. 41

H2

K2

B2

C2

D2

E2

F2

Fig. 40

6.20 FLUE COLLECTOR REMOVAL (g. 40)

Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Remove the heat exchang­er as per 6.16. Locate and remove the screw (Y1) that secures

the ue gas analysis test point cover (Z1). Disconnect the ues

thermistor wiring connections. Locate and remove the 4 screws
(A2). Locate and remove the 2 screws (A3). Gently ease the
condensate collector (A4) out off its location. Gently ease the

ue collector out off its location. Replace in the reverse order.

6.20.1 DHW FLOW RESTRICTOR (g. 41)

Carry out the component removal procedure as described in

6.4.

Disconnect the cold water inlet pipe at the DHW ow switch

(B2). Using a small screwdriver, gently ease the ow restrictor
(C2) from its seating. Replace in the reverse order. Ensure
all seals are in good condition, taking care to ensure they are
replaced correctly.

6.20.2 DHW FLOW SWITCH (g. 41)

Carry out component removal procedure as described in 6.4.
Remove the locking pin (D2). Disconnect and remove the cold

water inlet pipe from the DHW ow switch & DHW heat ex­changer. Disconnect the wiring to the DHW ow switch. Slacken

and unscrew the inlet connection. Unscrew the nut (E2). Lift the

DHW ow switch housing from its seating. If necessary remove
the locking pin (F2) from the DHW ow switch, taking care not
to lose the oat contained within the housing.
Replace in the reverse order ensuring that the housing is rmly

inserted onto its seating. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.

6.20.3 VALVE ACTUATOR (g. 42)

Carry out component removal procedure as described in 6.4.
Remove the locking pin (G3) that secures the actuator (H2) to
the heating manifold. Disconnect the electrical plug from the
actuator. Replace in the reverse order.

6.20.4 DHW THERMISTOR (g. 31)

Carry out component removal procedure as described in 6.4.
Locate and remove the thermistor locking pin (I2). Gently ease
the thermistor assembly (J2) from the hydraulic manifold. Re­place in the reverse order.

6.20.5 DIVERTOR VALVE ASSEMBLY (g. 42)

Carry out component removal procedure as described in 6.4.
Remove the valve actuator as described in 6.20.3. Locate and
remove the locking pin (G2) that secures the valve housing
cover to the hydraulic manifold. Gently prise the valve as­sembly from the manifold (K2). Replace in the reverse order
ensuring that the seating assembly is inserted properly. Ensure
all seals are in good condition, taking care to ensure they are
replaced correctly.

G3

Y1

Z1

A2

A3

A4

26

7.3 CHECKING THE CO2 AND ADJUSTING THE
GAS VALVE

THE GAS VALVE MUST BE SET-UP OR ADJUSTED WITH THE
AID OF A PROPERLY CALIBRATED FLUE GAS ANALYSER.
Isolate the appliance from the electrical supply and remove

the appliance casing as described in 4.7.1. Set the ue gas
analyser to read CO2 and insert the probe into the ue analysis
test point (Y1-Z1 g. 40). Restore the electrical supply to the

boiler and switch the boiler to the OFF mode.
Have access to the printed circuit board, locate and open the
closing plug on the dash board (L2), locate and press the CO

button (see g. 43 pos. SW1). Press the button the number of

times according the function requirement as per 7.3.1.

7.1 CHECKING APPLIANCE OPERATION

When carrying out any repairs or servicing to the appliance,
the relevant commissioning procedure must be undertaken to
ensure the continued safe operation of the appliance. Particular
attention should be made to ensure gas tightness, water tight­ness and the electrical integrity of the appliance.

7.2 APPLIANCE MODES OF OPERATION

NOTE

There must be sufcient system water pressure (min. 0.5 bar)
to ensure the water pressure switch is activated. If there is in-

sufcient system pressure the pump and fan will be prevented

from operating and the low-pressure fault code will be indicated.

7.2.1 SELECTOR SWITCH IN THE OFF/RESET POSITION

When the selector switch is in the OFF/RESET position, the
following functions are active.

Active functions:

•frost-protection system

•pump & actuator anti-block.

7.2.2 ON-BOARD FUNCTIONS

• CO FUNCTION: the CO function when activated, will allow the
appliance to run at CH maximum, DHW maximum or minimum
output whilst a combustion analysis check or a mechanical gas
valve calibration is being carried out. Whilst the CO function
is active, all other functions are disabled (minimum power
operating period, anti-cycle, set-point, etc). Once enabled,
the CO function will remain active for a 15-minute period, or
until the function is manually deactivated

• FROST-PROTECTION: this function is only active when
there are no requests for heating or HW. If the temperature
drops below 5°C, the boiler will operate on minimum power
until the temperature of the thermistors reaches 35°C for CH
and 55°C for DHW. Thereafter the pump & fan will over-run
for 30-seconds.

• ANTI-C YCLE FUNCTION: the anti-cycle function ensures the
burner remains switched off for at least 3-minutes after the
set-point hysterisis (set-point + 5-deg) for CH heat request.

• PUMP ANTI-BLOCK FUNCTION: when there has been no
heating or HW request for 24-hours, the anti-block cycle is
activated. The pump will be activated for a period of 30-sec­onds.

• ACTUATOR ANTI-BLOCK FUNCTION: when there has been
no heating or HW request for 24-hours, the anti-block cycle

is activated. The divertor valve actuator will motor briey to

the heating position, and then back to the DHW position. The

pump will run briey.

• SARA function: the SARA function permits the boiler (when
the set-point is within the SARA range) to automatically adjust

(raise) the heating ow outlet temperature should the room

thermostat contacts remain closed for more that 20-minutes.

• DHW PRE-HEAT FUNCTION: when the DHW pre-heat func-
tion is enabled, the appliance will light periodically to maintain
the temperature of the DHW heat exchanger. When the
DHW thermistor and the primary thermistor fall below 35°C

and 55°C respectively, the boiler will re on minimum +25%

power until the primary thermistor exceeds 55°C. Thereafter
the pump will over-run for a period of 30-seconds.

7.2.3 HEATING MODE

With the selector switch in the heating & hot water position
and any additional controls (time clock, programmer, room
thermostat, etc.) calling for heat, the appliance will operate
in the heating mode. The pump and fan will be activated via

the ow temperature sensor. When the fan is sensed to be

operating correctly (tacho signal), the ignition sequence com­mences. Ignition is sensed by the electronic circuit to ensure

ame stability at the burner. Once successful ignition has been

achieved, the electronic circuitry increases the gas rate to 75%
for a period of 15 minutes.
The speed of the fan and therefore the output of the boiler is
determined by the temperature of the water sensed by the

ow temperature sensor, consequently a high temperature at
the ow sensor results in a lower fan speed. As the water tem-

perature increases, the temperature sensors – located on the

ow pipe 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
(+ hysterisis), the burner will switch off. The built-in anti-cycle
device prevents the burner from re-lighting for approximately

3-minutes. When the temperature of the ow sensor falls below

the set point (- hysterisis), the burner will re-light.

NOTE

If the spark/sensing electrode does not sense ignition the appli­ance will re-attempt ignition a further 4-times then go to lockout.
When the set-point has been reached (the position of the heating
temperature selector) as measured at the primary thermistor, the
appliance will begin the modulation phase whereby the fan and
gas valve will continuously modulate to maintain the set-point.
If the temperature continues to rise and exceeds the set-point
by 5°C (hysterisis), the burner will shut down. A new ignition
sequence will be enabled when the 3- minute anti-cycle has
been performed and the temperature at the primary thermistor
has dropped 5°C (hysterisis) below the set-point.

7.2.4 DHW MODE

With the selector switch in either the hot water only or heating
& hot water position, the appliance will operate in the hot water

mode whenever a DHW outlet is opened. A ow rate exceeding
2-litres per minute will activate the DHW ow switch whereupon
the pump and fan will be activated via the ow temperature

sensor. When the fan is sensed to be operating correctly (tacho
signal), the ignition sequence commences. Ignition is sensed

by the electronic circuitry to ensure ame stability at the burner.

Once successful ignition has been achieved, the electronic
circuit allows the gas rate to achieve the modulation value.

NOTE

When the request for heating and/or hot water has been satis-

ed, the appliance pump and fan may continue to circulate to

dissipate any residual heat within the appliance.

ATTENTION
Gas type and appliance output must be set according to the

specic appliance specication. Vokèra accepts no responsi­bility if the gas type is not correctly adjusted according to the

respective appliance specication as detailed on the appliance

data badge.

SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING

L2

Fig. 43

SW1

use the supplied

screwdriver to push the

CO botton (SW1)

27

Fig. 44

7.3.2 GAS VALVE MAXIMUM SETTING

Set the CO2 button at maximum (see 7.3.1), once the maximum
is obtained check that it corresponds with the appropriate CO

2

value (Maximum) for the respective appliance (see 2.11). If
the CO

2

reading is correct, proceed to gas valve minimum
setting (7.3.3).
However, if the CO

2

reading is incorrect, the maximum gas

pressure must be adjusted as follows:

• using a 2.5mm Allen key, very slowly turn the maximum ad-

justment screw (see g. 44) – clockwise to decrease, counter

clockwise to increase – until the correct value is displayed on
the CO

2

analyser (allow time for the analyser to stabilise).

7.3.3 GAS VALVE MINIMUM SETTING

Set the CO

2

button at minimum (see 7.3.1), once the minimum

is obtained check that it corresponds with the appropriate CO

2

value (Minimum) for the respective appliance (see 2.11). If the
CO

2

reading is correct, proceed to completion (7.3.4).

However, if the CO

2

reading is incorrect, the minimum gas

pressure must be adjusted as follows:

•

locate the minimum adjustment screw (g. 44), using a suit­able screwdriver remove the protection plug

• using a 4mm Allen key, very slowly turn the minimum adjust-

ment screw (see g. 44) - clockwise to increase, counter

clockwise to decrease - until the correct value is displayed
on the CO

2

analyser (allow time for the analyser to stabilise).

7.3.4 COMPLETION

On completion of the combustion analysis check and/or any
gas valve adjustment, ret the plug (g. 43 L2) and move the

mode selector throught

position. Remove the test probe

from the test point and ret the sealing screw/s and/or cap.

IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY
GAS CARRYING COMPONENTS HAVE BEEN REMOVED,
REPLACED OR DISTURBED.

7.4 COMBUSTION ANALYSIS TEST

A combustion analysis check can easily be carried out on the
appliance via the test points located on the top of the appli­ance (see 7.3).

• Insert the ue gas analyser probe into the ue gas test point

(see g. 40).

• Operate the boiler in combustion analysis mode (see 7.3.1)

and compare the values with those shown in section 2 (Nat.
Gas) or section 10 (LPG). If different adjust the gas valve
according to 7.3.1, 7.3.2, & 7.3.3.

Note An existing boiler with a measured CO/CO

2

ratio of 0.004/1
or less can be deemed as operating satisfactorily, with a mea­sured CO/CO

2

ratio of greater than 0.004/1 can be deemed as

at risk, with a measured CO/CO

2

ratio of greater than 0.008/1

can be deemed as immediately dangerous.

7.5 CHECKING THE EXPANSION VESSEL

Carry out the component removal procedure as described in

6.4. You must ensure that the boiler is completely drained of
water. Using a suitable pressure gauge, remove dust cap on
expansion vessel and check the charge pressure. The cor­rect charge pressure should be 1.0 bar ± 0.1 bar. If the charge
pressure is less, use a suitable pump to increase the charge.

7.3.1 CO

2

FUNCTION SETTINGS

Locate the CO

button (see 7.3)

Select the main selector switch in position

NOTE

You must ensure the drain valve is in the open position whilst
re-charging takes place. Replace the dust cap and carry out
the relevant commissioning procedure (section 5).

7.6 EXTERNAL FAULTS

Before carrying out any faultnding or component replacement,

ensure the fault is not attributable to any aspect of the installation.

7.6.1 INSTALLATION FAULTS

Symptom Possible cause

No ignition Check wiring/check electrical
supply

No hot water Check pipe-work
No heating Check external controls

Fault Possible cause
Fault code Check gas supply, check ue

system, check polarity

7.7 ELECTRICAL CHECKS

Any electrical checks must be carried out by a suitably quali-

ed person.

7.7.1 EARTH CONTINUITY TEST

Isolate the appliance from the electrical supply, and using a
suitable multi-meter carry out a resistance test. Connect test
leads between an appliance earth point and the earth wire of
the appliance supply cable. The resistance should be less than
1 OHM. If the resistance is greater than 1 OHM check all earth
wires and connectors for continuity and integrity.

7.7.2 SHORT CIRCUIT CHECK

Isolate the appliance from the electrical supply, and using a
suitable multi-meter, carry out a short circuit test between the
Live & Neutral connections at the appliance terminal strip.
Repeat above test on the Live & Earth connections at the ap­pliance terminal strip.

NOTE

Should it be found that the fuse has failed but no fault is in­dicated, a detailed continuity check will be required to trace

Minimum

screw

Inlet gas pressure

connection

Compensation pipe

connection

Maximum

screw

CO2 FUNCTIONS ACTION ON THE BUTTON DISPLAY

combustion analysis mode press once = burner running at maximum heating

ACO

gas valve maximun setting press twice = burner running at maximum DHW

ACO

gas valve minimum setting press three time = burner running at minimum

ACO

NOTE

1 - Any additional pressing of CO button after the third time the burner switched between maximum DHW and minimum.
2 - To restart the CO

function it is necessary to pass throught the position with the main selector switch

28

the fault. A visual inspection of components may also assist in
locating the fault.

7.7.3 POLARITY CHECK

With the appliance connected to the electrical supply and us­ing a suitable multimeter, carry out the following voltage tests:

• connect test leads between the Live & Neutral connections
at the appliance terminal strip. The meter should read ap­proximately 230V ac. If so proceed to next stage. If not, see

7.7.4.

• connect test leads between the Live & Earth connections
at the appliance terminal strip. The meter should read ap­proximately 230V ac. If so proceed to next stage. If not, see

7.7.4.

• connect test leads between the Neutral & Earth connec­tions at the appliance terminal strip. The meter should read
approximately 0 – 15Vac. If so polarity is correct. If not, see

7.7.4.

7.7.4 REVERSED POLARITY OR SUPPLY FAULT

Repeat the above tests at the appliance isolator, if testing
reveals correct polarity and/or supply at the isolator, re-check
wiring and connections between the isolator and the appliance.
If tests on the isolator also reveal reversed polarity or a supply
fault, consult the local electricity supplier for advice.

ISTANCE TO EARTH CHECK

Isolate the appliance from the electrical supply, and using a
suitable multi-meter carry out a resistance test. Connect test
leads between the Live & Earth connections at the appliance

terminal strip. If the meter reads other than innity there is a

fault that must be isolated, carry out a detailed continuity check
to identify the location of the fault.
These series of checks must be carried out before attempting

any faultnding procedures on the appliance. On completion

of any task that required the disconnection and re-connection
of any electrical wiring or component, these checks must be
repeated.

7.8 FAULT FINDING

Before attempting any faultnding, the electrical checks as

detailed in 7.7 must be carried out. Isolate the appliance from
the electrical supply.

Disconnect any external controls from terminal plug (CN5 g.

46), and insert a link-wire between the two wires at the ‘TA’

connections.

NOTE

Restore the electrical supply to the boiler and turn the selector
switch to the on position. The boiler should now function as
described in section 7. Should the boiler fail to respond, the
internal fuses and connectors should be checked to ensure
integrity and continuity.

COMPONENT VALUE

Fan 230Vac
Pump 230Vac
Valve actuator 230Vac
Ignition transformer 230Vac
Gas valve 230Vac
Room thermostat connection 24Vdc
NTC thermistor (dry contact) 10Kohm
NTC thermistor (wet contact) 10Kohm

FUNCTION VALUE

Standard Heating temperature
range (min – max °C) 40 - 80
DHW temperature
range (min – max °C) 37 - 60
75% maximum CH time 15 min
Heating OFF hysterisis (°C) SP + 5
Heating ON hysterisis (°C) SP – 5
DHW OFF hysterisis (°C) SP + 5
DHW ON hysterisis (°C) SP + 4
Anti-cycle delay 3-min
Pump over-run 30-sec
Low output (min. output + %) Min+25
CO function max temp. (°C) 90
CO re-light temp. (°C) 78
CO function time 15-min
Flow NTC max temp. (°C) 90
High limit thermostat (°C) 105
Flue NTC max temp. (°C) 125
Maximum differential (°C) 35

IGNITION CONTROL VALUE

Ignition attempts before L/O (lockout) 5
Re-ignition attempts after loss

of ame signal 5

7.9 COMPONENT VALUES & CHARACTERIS­TICS

APPLIANCE STATUS AND FAULT CODES

When the boiler detects a temporary fault condition, the ap-

propriate code is shown. If/when the fault is nal, the pump

will perform a 60-second post circulation and fault code will be
displayed. See table on page. 5.

29

7.10 ADJUSTMENTS

The boiler has already been adjusted by the manufacturer
during production. If the adjustments need to be made again,
for example after extraordinary maintenance, replacement of
the gas valve, or conversion from methane gas to LPG, ob­serve the following procedures.
The adjustment of the maximum and minimum output, and of
the maximum and minimum heating and of slow switch-on,
must be made strictly in the sequence indicated, and only by

qualied personnel only:

- disconnect the boiler from the power supply

- turn the heating water temperature selector to its maximum

- loosen the xing screws (E) on the instrument panel

- lift then turn the instrument panel towards you

- loosen the xing screws on the cover (F) to access the ter­minal board

- insert the jumpers JP1 and JP3

- power up the boiler

The display shows “ADJ” for approximately 4 seconds
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Soft light fan speed
as follows:

- turn the heating water temperature selector to set the re­quired value

- press the CO button and then skip to the calibration of the
next parameter.

Live electrical parts (230 V AC).

The following icons light up on the monitor:

1. during domestic hot water/absolute maximum cali-

bration

2.

during minimum calibration

3. during heating maximum calibration

4. P during soft light fan speed calibration

End the procedure by removing jumpers JP1 and JP3 to
store these set values in the memory.
THE function can be ended at any time without storing the
set values in the memory and retaining the original values
as follows:

- remove jumpers JP1 and JP3 before all 4 parameters have
been set

- set the function selector to (OFF/RESET)

- cut the power supply

- waiting for 15 minutes after it is connected.

Calibration can be carried out without switch on the

boiler.

By turning the heating selection knob, the monitor au-

tomatically shows the number of rotations, expressed
in hundreds (e.g. 25 = 2,500 rpm).

GAS VALVE CALIBRATION

- Connect the boiler to the power supply

- Open the gas tap

- Set the function selector to (OFF/RESET) (monitor off)

- Remove the screws (E), remove the casing, remove the re­taining screw below the control fascia then lower the fascia

towards you (g. 24)

- Loosen the xing screws on the cover (F) to access the

terminal board

- Press the CO button

Live electrical parts (230 V AC).

- Wait for burner ignition.

The display shows “ACO”. The boiler operates at maximum

heat output.

The “combustion analysis” function remains active for a

limited time (15 min); if a delivery temperature of 90°C is
reached, the burner is switched off. It will be switched back
on when this temperature drops below 78°C.

- Insert the analyser probe in the ports provided in the air
distribution box, after removing the screws from the cover

- Press the “combustion analysis” button a second time to
reach the number of rotations corresponding to the maxi­mum domestic hot water output (table 1)

- Check the CO2 value: (table 4) if the value does not match
the value given in the table, use the gas valve maximum
adjustment screw

- Press the “combustion analysis” button a third time to reach
the number of rotations corresponding to the minimum out­put (table 2)

- Check the CO2 value: (table 5) if the value does not match
the value given in the table, use the gas valve minimum
adjustment screw

- To exit the “combustion analysis” function, turn the control
knob

- Remove the ue gas probe and ret the plug

- Close the instrument panel and ret the housing.

The “combustion analysis” function is automatically deactivat­ed if the board triggers an alarm. In the event of a fault during
the combustion analysis cycle, carry out the reset procedure.

table 1

table 2

table 4

table 5

MAXIMUM NUMBER OF

FAN ROTATIONS

METHANE
GAS (G20)

LIQUID GAS

(G31)

Vision 25C heating - DHW

49 - 61 49 - 61 rpm

Vision 30C heating - DHW

53 - 62 52 - 60 rpm

MINIMUM NUMBER OF

FAN ROTATIONS

METHANE
GAS (G20)

LIQUID GAS

(G31)

14 14 rpm

Max. CO

2

METHANE
GAS (G20)

LIQUID GAS

(G31)

9.0 10.5 %

Min. CO

2

METHANE
GAS (G20)

LIQUID GAS

(G31)

9.5 10.5 %

table 3

SOFT LIGHT FAN SPEED

METHANE
GAS (G20)

LIQUID GAS

(G31)

40 40 rpm

30

The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional ue gas emission limits it is, however,

possible to modify this value, referring to the graphs below.

COs.a. curve (Qnheating)

Heat output (kW)

HTG curve (Qnheating)

Heat output (kW)

Fan rotations (rpm)

CO emissions s.a. (p.p.m.)

Vision 30C

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

4681012141618202224262830

1200

1600

2000

2400

2800

3200

3600

4000

4400

4800

5200

5600

6000

6400

4681012141618202224262830

7.10.1 CHECKING THE FAN SPEED

Locate the CO button (see Fig 43).
Select the main selector switch to the ON position, press the

CO button once, the display will then scroll through the fan
speeds along with the relevant icon.

7.10.2 THERMOREGULATION
To set the temperature regulation curve, locate potentiometer

(P3). By turning (P3), the curve is shown on the LCD display.

The user can adjust the temperature of the heating system
indirectly by changing the required room temperature from
between 15°C & 25°C, this will allow the PCB to recalculate
the system temperature required, the default temperature for
calculating the curve is 20°C.
The graph below can be used to determine the correct curve
setting.

The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional ue gas emission limits it is, however,

possible to modify this value, referring to the graphs below.

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

468101214161820222426

COs.a. curve (Qnheating)

Heat output (kW)

1200

1600

2000

2400

2800

3200

3600

4000

4400

4800

5200

5600

6000

6400

468101214161820222426

HTG curve (Qnheating)

Heat output (kW)

Fan rotations (rpm)

CO emissions s.a. (p.p.m.)

Vision 25C

31

8.1 EXTERNAL WIRING

The appliance comes with a factory tted (TA) link to allow

basic operation of the boiler via the mode selector switch. If
external controls are to be added to the system, they must be
connected to the appliance as shown in the following diagrams.
For advice on controls that are not featured in this book, please
contact Vokèra technical on 0844 391 0999.

8.1.1 EXTERNAL WIRING LIMITATIONS

Low voltage and High voltage cables must be run separately.
Any external wiring must remain within the limits as detailed:
room thermostat = 30-metres

8.1.2 OUTSIDE SENSOR

The outside sensor can be connected via a controls interface
which enables a connection to be made directly on the PCB
at plug CN6 (see Fig)

8.2 OTHER DEVICES

Contact the controls manufacturer and/or Vokèra technical

department should you require more specic information on the

suitability of a particular control. Further guidance on the recom­mended practice for the installation of external controls, can be

found in CHeSS – HC5/HC6 (www.energyefciency.gov.uk).

IMPORTANT

• The boiler must always be supplied with a permanent 230V
electrical supply.

• The room thermostat connection is low voltage (24 Vdc)

• Do not connect any controls or auxiliary equipment to the

low-voltage terminal strip, other than that approved/supplied
by Vokèra Ltd.

Fig. 45

SECTION 8 - WIRING DIAGRAMS

Room Thermostat (24 Vdc)

NOTE: Use contacts free of voltage

M2

32

FUNCTIONAL DIAGRAM

Fig. 46

AKL Main PCB

DWC Digital display

P1 Selector switch and heating potentiometer

P2 DHW potentiometer

P3 Potentiometer to select temperature regulation curve

P4 Unused

JP1 Enabling front setting knob (Range rated)

JP2 Unused

JP3 Setting (see “Setting and adjusting” paragraph)

JP4 Unused

JP5 Unused

JP6 Unused

JP7 Unused

JP8 Closed - Unused

CN1-CN15 Connectors

S.W. CO2 function button

F.S. (1) Flame sensor

F1 Fuse 3.15A T

F External fuse 3.15A F

M3 Terminal strip for electrical connection high power

M2 Terminal strip for room thermostat (24 Vdc)

P Pump

OPE Gas valve solenoids

F Hv Fan power supply 230 V

F Lv Fan signal control

D.H.W.F.S Domestic hot water ow switch

D.H.W.T Domestic hot water temperature

WPS Water pressure switch

S.E. Spark electrode

TSC2 Ignition transformer

3W 3 way motor

F.O.H.T Flow over heat thermostat

FS Flue sensor

FT Flow thermistor (NTC)

RS Return thermistor (NTC)

brown

CN3

blue

F Hv

1

2

7

1

CN9

W.P.S.

2

3

1

D.H.W.T.

D.H.W.F.S.

white

white

red

red

violet
violet

3W

2

N

1

D.H.W.

3

Heat

black

brown

blue

3

1

CN4

AKL

JP1

JP2
JP3

JP4

JP5

JP6

JP7

JP8

P4

P3

P2

P1

CN13

CN14

F1

3.15A T

CN12

CN5

CN6

CN1

1

1

6

1

2

1

3

CN2

CN3

CN4

L1

L2L3

1

12

CN11

1

4

CN10

1

7

CN9

FA1

FA2

1

5

CN7

1

3

CN8

F.S. (1)

CN15

SW1

blue

blue

blue

black

DWC

313

white

red

black

CN8

M2

Room thermostat

(24 Vdc)

CN1

red

black

white

1

23

4

5

CN1

blue

blue

blue

TSC2

blue

Spark

electrode

brown

yellow/green

N

F

CN1

3

1

2

red (+)

blue (HS)

pink (PWM)

grey (−)

CN10

F Lv

1

4

1

12

CN11

white

white

F.T.

−t°

−t°

R.S.

red

red

−t°

F.S.

grey
grey
black

F.O.HT.

blue
blue

white

brown

blue

2
1

3

5
4

GAS VALVE

12 43

OPEOPE

pink

blue

P

brown

N

L

Fuse 3.15A F

M3

F

blue

blue

brown

brown

brown

blue

33

10.1 RELATED DOCUMENTS

BS 5440 PARTS 1 & 2 FLUES & VENTILATION REQUIREMENTS

BS 5449 PART 1 FORCED CIRCULATION OF HOT WATER SYSTEMS
BS 5482 PART 1 DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW

SECTION 10 - LPG INSTRUCTIONS

10.6 CHECKING THE CO2 AND ADJUSTING THE
GAS VALVE

THE GAS VALVE MUST BE SET-UP OR ADJUSTED WITH
THE AID OF A PROPERLY CALIBRATED FLUE GAS ANA­LYSER.
Isolate the appliance from the electrical supply and remove

the appliance casing as described in 4.7.1. Set the ue gas

analyser to read CO

2

and insert the probe into the ue analysis

test point (Y1-Z1 g. 40). Restore the electrical supply to the
boiler and switch the boiler to the OFF mode.
Have access to the printed circuit board, locate and open the
closing plug on the dash board (L2 g. 43), locate and press
the CO

button (see g. 43 pos. SW1). The appliance will now

operate in CO

2

mode for approximately 15-minutes.

10.6.1 CO

2

FUNCTION SETTINGS

Locate the CO

button (see 7.3)

Select the main selector switch in position

10.3 CONVERTING THE APPLIANCE GAS TYPE

To convert the appliance to another gas type it is necessary to
change the injector and adjust the gas valve (CO

2

).

• To change the injector see 6.12.1

• To replace the ange on the silencer (only Vision 30C) see 6.15

• To adjust CO2 values see 10.6

10.4 GAS SUPPLY

The gas supply must be connected to the appliance by a com-

petent LPG installer and must be of sufcient size to supply

the appliance at its maximum output. An existing supply must
be checked to ensure that it is of adequate size to deal with
the maximum rated input of this and any other appliances that
it serves.

10.5 GAS SUPPLY INSTALLATION

The entire installation including the meter must be purged and
checked for gas tightness.

10.2 TECHNICAL DATA

Gas Pressures Vision 25C Vision 29C

Inlet pressure 37.0 mbar 37.0 mbar

Heating maximum gas rate (kg/hr) 1.55 1.94

DHW maximum gas rate (kg/hr) 1.94 2.25

Minimum gas rate (kg/hr) 0.39 0.47

Injector size 3.9 mm 4.3

Silencer ange 27 mm (tted) 29 mm

CO2 @ maximum output (%) 10.5 10.5

CO2 @ minimum output (%) 10.5 10.5

CO @ maximum output (ppm) 190 250

CO @ minimum output (ppm) 20 25

CO2 FUNCTIONS ACTION ON THE BUTTON DISPLAY

combustion analysis mode press once = burner running at maximum heating

ACO

gas valve maximun setting press twice = burner running at maximum DHW

ACO

gas valve minimum setting press three time = burner running at minimum

ACO

34

10.6.2 GAS VALVE MAXIMUM SETTING

Set the CO

button at maximum (see 10.3.1), once the maximum

is obtained check that it corresponds with the appropriate CO

2

value (Maximum) for the respective appliance. If the CO

2

read­ing is correct, proceed to gas valve minimum setting (10.7.2).
However, if the CO

2

reading is incorrect, the maximum gas

pressure must be adjusted as follows:

• using a 2.5mm Allen key, very slowly turn the maximum ad-

justment screw (see g. 44) – clockwise to decrease, counter

clockwise to increase – until the correct value is displayed on
the CO

2

analyser (allow time for the analyser to stabilise).

10.6.3 GAS VALVE MINIMUM SETTING

Set the CO

button at minimum (see 10.3.1), once the minimum

is obtained check that it corresponds with the appropriate CO

2

value (Minimum) for the respective appliance. If the CO

2

read­ing is correct, proceed to completion (10.7.3).
However, if the CO

2

reading is incorrect, the minimum gas

pressure must be adjusted as follows:

•

locate the minimum adjustment screw (g. 44), using a suit­able screwdriver remove the protection plug

• using a 4mm Allen key, very slowly turn the minimum adjust-

ment screw (see g. 44) - clockwise to increase, counter

clockwise to decrease - until the correct value is displayed
on the CO

2

analyser (allow time for the analyser to stabilise).

10.6.4 COMPLETION

On completion of the combustion analysis check and/or any
gas valve adjustment, ret the plug (L2 j) and move the mode

selector to the

position. Remove the test probe from the

test point and ret the sealing screw/s and/or cap.

IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY
GAS CARRYING COMPONENTS HAVE BEEN REMOVED,
REPLACED OR DISTURBED.

ATTENTION
Gas type and appliance output must be set according to the

specic appliance specication. Vokèra accepts no responsi­bility if the gas type is not correctly adjusted according to the

respective appliance specication as detailed on the appliance

data badge.

GAS BOILER SYSTEM COMMISSIONING CHECKLIST

CONTROLS

Tick the appropriate boxes

Time and Temperature Control to Heating Room Thermostat and Programmable

Load/Weather Optimum Start

Programmer/Timer

Room Thermostat Compensation Control

Time and Temperature Control to Hot Water Cylinder Thermostat and Programmer/Timer Combination Boiler

Heating Zone Valves Fitted Not Required

Hot Water Zone Valves Fitted Not Required

Thermostatic Radiator Valves Fitted Not Required

Automatic Bypass to System Fitted Not Required

Boiler Interlock Provided

ALL SYSTEMS

The system has been flushed and cleaned in accordance with BS7593 and boiler manufacturer’s instructions Yes

What system cleaner was used?

What inhibitor was used? Quantity

litres

CENTRAL HEATING MODE

Measure and Record:

Gas Rate

m3/hr OR

ft

3

/hr

Burner Operating Pressure (if applicable)

mbar OR Gas Inlet Pressure mbar

Central Heating Flow Temperature

°C

Central Heating Return Temperature

°C

COMBINATION BOILERS ONLY

Is the installation in a hard water area (above 200ppm)? Yes

No

If yes, has a water scale reducer been fitted? Yes

No

What type of scale reducer has been fitted?

DOMESTIC HOT WATER MODE Measure and Record:

Gas Rate

m3/hr OR

ft

3

/hr

Burner Operating Pressure (at maximum rate)

mbar OR Gas Inlet Pressure (at maximum rate) mbar

Cold Water Inlet Temperature

°C

Hot water has been checked at all outlets Yes

Temperature

°C

Water Flow Rate

l/min

CONDENSING BOILERS ONLY

The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 Yes

ALL INSTALLATIONS

If required by the manufacturer, record the following CO

2

% OR CO ppm OR CO/CO

2

Ratio

The heating and hot water system complies with the appropriate Building Regulations Yes

The boiler and associated products have been installed and commissioned in accordance with the manufacturer’s instructions Yes

The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes

The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes

*

All installations in England and Wales must be notified to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme.
A Building Regulations Compliance Certificate will then be issued to the customer.

©Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk

Commi ssioning Engineer’s Signature

Customer’s Signature

(To confirm satisfactory demonstration and receipt of manufacturer’s literature)

This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating
compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.

Failure to install and commission this equipment to the manufacturer’s instructions may invalidate the warranty but does not affect statutory rights.

Customer Name Telephone Number

Address

Boiler Make and Model

Boiler Serial Number

Commissioned by (print name) CORGI ID Number

Company Name Telephone Number

Company Address

Commissioning Date

To be completed by the customer on receipt of a Building Regulations Compliance Certificate

*

:

Building Regulations Notification Number (if applicable)

36

SERVICE RECORD

It is recommended that your heating system is serviced regularly and that the appropriate Service Record is completed.

Service Provider

Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s
instructions.

Always use the manufacturer’s specified spare part when replacing controls.

SERVICE 1

Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 3

Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 5 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 7 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 9 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 2

Date

Energy Efficiency Checkl ist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 4

Date

Energy Efficiency Checkl ist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 6 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 8 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

SERVICE 10 Date

Energy Efficiency Checklist completed?

Yes

No

Engineer Name

Company Name

Telephone Number

CORGI ID Number

Comments

Signature

Cod. 20052854 - 07/12 - Ed. 1

Registered address:

Vokèra Ltd

Borderlake House

Unit 7 Riverside Industrial Estate

London Colney
Herts AL2 1HG

[e-mail]

www.vokera.co.uk

www.vokera.ie

Sales, General Enquires

T 0844 391 0999
F 0844 391 0998

Vokèra Ireland

West Court, Callan

Co Kilkenny

T 056 7755057
F 056 7755060

Vokèra Limited reserve the right to change

specication without prior notice

Consumers statutory rights are not affected.

A Riello Group Company.

Company Reg No: 1047779