VOKERA Vibe 20 A G.C. N 41-094-84, Vibe 25 A G.C. N 41-094-85, Vision 25, Vision 20S, Vision S User Instructions

36

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.

Vibe

High efciency system boiler

Vibe 20 A G.C. N° 41-094-84
Vibe 25 A G.C. N° 41-094-85

32

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 3

2.2 Appliance controls 3

2.3 Lighting the boiler 3

2.4 Adjusting the heating temperature 3

2.5 Explanation of features 3

2.6 Automatic temperature control 3
How to... Page

3.1 How to top-up the system pressure 3

3.2 How to reset the appliance 3

3.3 How to shut down the system for short periods 3

3.4 How to shut down the system for long periods 3

3.5 How to care for the appliance 3
What if... Page

4.1 What if I suspect a gas leak 4

4.2 What if I have frequently top-up the system 4

4.3 What if the appliance is due its annual service 4

4.4 What if I need to call an engineer 4

Installation and Servicing instructions
Design principles & operating sequence Page

1.1 Principle components 6

1.2 Mode of operation (at rest) 6

1.3 Mode of operation (heating) 6

1.4 Safety devices 6
Technical data Page

2.1 Central heating 7

2.2 Gas pressures 7

2.3 Expansion vessel 7

2.4 Dimensions 7

2.5 Clearances 7

2.6 Connections 7

2.7 Electrical 7

2.8 Flue details (concentric) 7

2.8A Flue details (twin pipes) 7

2.9 Efciency 7

2.10 Emissions 7

2.11 Pump duty 8
General requirements (UK) Page

3.1 Related documents 9

3.2 Location of appliance 9

3.3 Gas supply 9

3.4 Flue system 9

3.5 Air supply 9

3.6 Water circulation 9

3.7 Electrical supply 10

3.8 Mounting on a combustible surface 10

3.9 Timber framed buildings 10

3.10 Inhibitors 10
General requirements (EIRE) Page

3A.1 Related documents 10

3A.2 Location of appliance 10
3A.3 Gas supply 10
3A.4 Flue system 10
3A.5 Air supply 11
3A.6 Water circulation 11
3A.7 Electrical supply 11
3A.8 Mounting on a combustible surface 11
3A.9 Timber framed buildings 11
3A.10 Inhibitors 11
3A.11 Declaration of conformity 11

Installation Page

4.1 Delivery 12

4.2 Contents 12

4.3 Unpacking 12

4.4 Preparation for mounting the appliance 12

4.5 Fitting the ue 12

4.6 Connecting the gas & water 16

4.7 Electrical connections 16

Commissioning Page

5.1 Gas supply installation 17

5.2 The heating system 17

5.3 Initial lling of the system 17

5.4 Initial ushing of the system 17

5.5 Pre-operation checks 17

5.6 Initial lighting 17

5.7 Checking gas pressure & combustion analysis 17

5.8 Final ushing of the heating system 17

5.9 Setting the boiler operating temperature 17

5.10 Setting the system design pressure 17

5.11 Regulating the central heating system 18

5.12 Final checks 18

5.13 Instructing the user 18
Servicing Page

6.1 General 18

6.2 Routine annual servicing 18

6.3 Replacement of components 18

6.4 Component removal procedure 18

6.5 Pump assembly 19

6.6 Safety valve 19

6.7 Lower automatic air release valves 19

6.8 Water pressure switch 19

6.9 Flow thermistor 19

6.10 Return thermistor 19

6.11 Printed circuit board 19

6.12 Gas valve 20

6.13 Electrodes 20

6.14 Flue fan & mixer 20

6.15 Burner 20

6.16 Main heat exchanger 21

6.17 Automatic by-pass 21

6.18 Expansion vessel removal 21

6.19 Condense trap removal 21

6.20 Flue collector removal 22

Checks, adjustments and fault nding Page

7.1 Checking appliance operation 22

7.2 Appliance modes of operation 22

7.3 Checking the CO2 & adjusting the valve 23

7.4 Combustion analysis test 23

7.5 Checking the expansion vessel 23

7.6 External faults 24

7.7 Electrical checks 24

7.8 Fault nding 24

7.9 Component values & characteristics 24
Wiring diagrams Page

8.1 External wiring 25

8.2 Typical control applications 25

8.3 Other devices 25

L.P.G. instructions Page

9.1 Related documents 27

9.2 Technical data 27

9.3 Converting the appliance gas type 27

9.4 Gas supply 27

9.5 Gas supply installation 27

9.6 Checking the CO2 and adjusting the gas valve 27
Commissioning checklist 28
Benchmark 30-31

1

USERS INSTRUCTIONS

1.1 GAS APPLIANCES

Gas Safety (Installations and Use) Regulations (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 COMMISSIONING CHECKLIST
(UK only)

A checklist 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 commissioning checklist 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 will invalidate the warranty.
This does not affect your statutory rights.

1.5 HOW DOES IT WORK?

Y our Vibe boiler supplies heated water to your radiators and hot
water to your hot water tank. 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.
Your Vibe 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

Y our Vokèra Vibe 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 re-

sponsible for the property in which the appliance is located/installed. A replacement copy can be obtained from V okèra customer
services.

INTRODUCTION

1.6 DIMENSIONS

1.7 CLEARANCES REQUIRED

1.8 FROST PROTECTION SYSTEM

The Vibe 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. In particular the
burner will be in ON status until the main temperature reaches
35°C for CH 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-f ault condition.

1.9 APPLIANCE STATUS INDICATORS

Y our boiler is equipped with 3 status LED indicators, the Green

LED indicates that the ame is present, the Red LED indicates

the appliance has detected a fault, whilst the Yellow LED indi­cates that there is Servicing operation in progress.

1. THINGS YOU SHOULD KNOW

Vibe 20A - 25A

HEIGHT 715 mm
WIDTH 405 mm
DEPTH 248 mm

ABOVE 150 mm
BELOW 150 mm
LEFT SIDE 12 mm

RIGHT SIDE 12 mm
FRONT 600 mm

2

Fig. 1

BOILER STATUS LED

Green LED Boiler is working/responding to a heating/hot water request
Red LED Boiler has identied a fault and has failed-safe. Refer to instructions on how to reset
Yellow LED Service operation

PRESSURE GAUGE

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

MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR

Mode selector switch:

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

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.

MODE SELECTOR SWITCH

RED LED

GREEN LED

HEATING TEMPERATURE SELECTOR

YELLOW LED

PRESSURE GAUGE

Boiler reset - Select this position if the boiler requires to be reset.

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

3

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 selector;

- burner ON mode (green);

- fault indicator (red);

- servicing mode indicator (yellow)

NOTE

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

The temperature range is adjustable between 40°C and 80°C.

When the status indicator (Green) is lit it indicates that the ame

is present and the burner is ON.

When the fault indicator (Red) is lit it indicates that the appliance
has identied a possible fault and performed a safety lockout.

When the fault indicator (Yellow) is lit it indicates that there is
a Servicing operation in progress.

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, counter-

clockwise 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 EXPLANATION OF FEATURES

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

of functions to be carried out simultaneously.

2.6 AUTOMATIC TEMPERATURE CONTROL

The automatic temperature control function (SARA), permits

the boiler (when the heating temperature selector is set within
4 and 6 sector) to automatically adjust (raise) the heating.
The activation and the disable of the function is visualized by
blinking the green led.

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. 2).

- 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 red fault LED is illuminated, 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. 2

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.

4

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.

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.

APPLIANCE STATUS LED AND FAULT CODES

Alarm type Led RED Led YELLOW Led GREEN Action
Purge cycle mode active NA BLINKING BLINKING BLINKING
Alarm high limit thermostat Final BLINKING OFF OFF Reset appliance. Call

engineer if fault re-occurs
Alarm system water pressure Final ON OFF ON Check/rell system pressure,

reset, check.
Call engineer if fault re-occurs

Alarm safety shutdown and/or Final ON OFF OFF Reset appliance. Call

internal fault engineer if fault re-occurs

Temporary fault Temporary OFF OFF BLINKING None
Service operation NA OFF BLINKING OFF None
Flame ON NA OFF OFF ON None
Fault sensors Final BLINKING OFF BLINKING Reset appliance. Call

engineer if fault re-occurs
Boiler stand-by NA OFF OFF BLINKING None

4. WHAT IF...

5

All installers are asked to follow the Benchmark Scheme by
adhering to the Code of Practise, which can be obtained from
www.centralheating.co.uk.

The Vibe comprises a range of high-efciency system boilers

with outputs of 20kW and 25kW. These appliances – by design
– incorporate electronic ignition, circulating pump, expansion
vessel, safety valve, pressure gauge and automatic by-pass.
The Vibe 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 Vibe can also be used with the V okèra

twin ue system.

The Vibe 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. 3

General layout

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

19 Return thermistor (NTC)

20 Gas valve
21 Condense trap

R Heating return connection
F Heating ow connection

G Gas connection

INTRODUCTION

INSTALLA TION AND SERVICING INSTRUCTIONS

R F G

6

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. 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.

•

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

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 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.

Fig. 4

Expansion

vessel

Safety

valve

Pump

Return

temperature

sensor

Main heat

exchanger

Bottom

AAV

Pressure

switch

Drain
valve

Flow temperature

sensor

Top AAV

Automatic

by-pass

CH

return

CH

ow

SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE

7

SECTION 2 - TECHNICAL DATA

2.1 Central Heating Vibe 20A Vibe 25A

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 3 bar
Minimum ow rate 350 l/h

2.2 Gas Pressures Vibe 20A Vibe 25A

Inlet pressure (G20) 20.0 mbar 20.0 mbar
Heating maximum gas rate (m3/hr) 2.12 2.64
Minimum gas rate (m3/hr) 0.53 0.63
Injector size (mm) 4.8 5.6
Silencer ange (ø mm) (tted) 31 -

2.3 Expansion Vessel Vibe 20A Vibe 25A

Capacity 8 litres
Maximum system volume 74 litres
Pre-charge pressure 1 bar

2.4 Dimensions Vibe 20A Vibe 25A

Height (mm) 715
Width (mm) 405
Depth (mm) 250
Dry weight (kg) 26 28

2.5 Clearances Vibe 20A Vibe 25A

Sides 12mm
Top 150mm from casing or 25mm above ue elbow (whichever is applicable)
Bottom 150mm
Front 600mm

2.6 Connections Vibe 20A Vibe 25A

Flow & return 22mm
Gas 15mm
Safety valve 15mm
Condense

21mm

2.7 Electrical Vibe 20A Vibe 25A

Power consumption (Watts) 96 107
Voltage (V/Hz) 230/50
Internal fuse 3.15A T (for PCB) - 3.15A F (for connections block)
External fuse 3A

2.8 Flue Details (concentric) Vibe 20A Vibe 25A

Maximum horizontal ue length (60/100mm) 5.85m 4.85m
Maximum vertical ue length (60/100mm) 6.85m 5.85m

2.8A Flue Details (twin pipes) Vibe 20A Vibe 25A

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

2.9 Efciency Vibe 20A Vibe 25A

SEDBUK (%) 90.13 90.26

2.10 Emissions Vibe 20A Vibe 25A

CO

2

@ maximum output (%) 9.0 9.0

CO

2

@ minimum output (%) 9.5 9.5
CO @ maximum output (ppm) 180 160
CO @ minimum output (ppm) 20 20
NOx rating class 5 class 5

8

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. 5

2.11 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. 6

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

Flow rate (l/h)

Residual head (x 100 mbar)

9

SECTION 3 - GENERAL REQUIREMENTS (UK)

This appliance must be installed by a competent person in ac-

cordance with the Gas Safety (Installation & Use) Regulations.

3.1 RELATED DOCUMENTS

The installation of this boiler must be in accordance with the

relevant requirements of the Gas Safety (Installation & Use)
Regulations, the local building regulations, the current I.E.E.

wiring regulations, the bylaws of the local water undertaking,

the Building Standards (Scotland) Regulation and Building
Standards (Northern Ireland) Regulations.

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

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

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. 7). This method of lling complies with the
current Water Supply (Water Fittings) Regulations 1999 and

Water Bylaws 2000 (Scotland).

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. 8).
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.

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.

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 com-

partment/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. 6). 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

BS 5440 Part 1, when the terminal is 0.5 metres (or less) below
plastic guttering or 1 metre (or less) below painted eaves.