Baxi Combi 80e, Combi 105e Quick Start Manual

Baxi Combi 80e & 105e

Gas Fired Wall Mounted Combination Boiler

Installation and
Servicing Instructions

Please leave these instructions with the user

2

Baxi UK Limited is one of the leading manufacturers

of domestic heating products in the UK.

Our first priority is to give a high quality service to our

customers. Quality is designed into every Baxi product

- products which fulfil the demands and needs of

customers, offering choice, efficiency and reliability.

To keep ahead of changing trends, we have made a

commitment to develop new ideas using the

latest technology - with the aim of continuing to make

the products that customers want to buy.

Everyone who works at Baxi has a commitment to

quality because we know that satisfied customers

mean continued success.

We hope you get a satisfactory service from Baxi. If

not, please let us know.

Natural Gas

Baxi Combi 80e

G.C.No47 075 06

Baxi Combi 105e

G.C.No47 075 08

Baxi is a BS-EN ISO 9001

Accredited Company

The boiler meets the requirements of Statutory Instrument
“ The Boiler (Efficiency) Regulations 1993 N

o

3083” and is
deemed to meet the requirements of Directive 92/42/EEC
on the energy efficiency requirements for new hot water
boilers fired with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by:
Notified Body 0051.

Product/Production certified by:
Notified Body 0051.

For GB/IE only.

3

1.0 Introduction 4

2.0 General Layout 5

3.0 Appliance Operation 6

4.0 Technical Data 7

5.0 Dimensions and Fixings 9

6.0 System Details 10

7.0 Site Requirements 13

8.0 Installation 18

9.0 Commissioning the Boiler 23

10.0 Completion 25

11.0 Servicing the Boiler 26

12.0 Changing Components 28

13.0 Illustrated Wiring Diagram 37

14.0 Fault Finding 38

15.0 Short Parts List 43

Section Page

Contents

Baxi UK Limited declare that no substances
harmful to health are contained in the
appliance or used during appliance
manufacture.

1.1 Description

1. The Baxi Combi 80e or 105e is a fully automatic
gas fired wall mounted combination boiler. It is
room sealed and fan assisted, and will serve
central heating and mains fed domestic hot water.

2. The boiler is set to give a maximum output of

24.0 kW (80e) or 31.0 kW (105e).

3. It is designed for use on Natural Gas (G20) and
can be converted to use Propane (80e and 105e)
or Butane (80e).

4. The boiler is suitable for use only on fully
pumped sealed heating systems. Priority is given
to domestic hot water.

5. The boiler data badge gives details of the
model, serial number and Gas Council number
and is situated on the control box. It is visible when
the case front panel is removed (Fig. 1).

6. The boiler is intended to be installed in
residential / commercial / light industrial E.M.C.
environments on a governed meter supply only.

7. The boiler must be installed with one of the
purpose designed flues such as the standard
horizontal flue kit, part no. 247719.

8. All systems must be thoroughly flushed and

treated with inhibitor (see section 6.2).

1.2 Installation

1. The appliance is suitable for installation only in G.B. and
I.E. and should be installed in accordance with the rules in
force. For Ireland install in accordance with I.S.813

“I

NSTALLATION OF GAS APPLIANCES”. The installation must be

carried out by a CORGI Registered Installer or other
competent person and be in accordance with the relevant
requirements of G

AS SAFETY (Installation and Use)

R

EGULATIONS, the BUILDING REGULATIONS (Scotland)

(Consolidation), the L

OCAL BUILDING REGULATIONS, the

C

URRENT I.E.E. WIRING REGULATIONS and the bye laws of the

Local Water Undertaking. Where no specific instructions are
given, reference should be made to the relevant BRITISH

STANDARD CODES OF PRACTICE.

1.3 Optional Extras

Various flue extensions, bends, vertical flue kits,
control accessories etc. are available as
optional extras. These are detailed in a
separate publication.

1.0 Introduction

4

Data Badge

Fig. 1

Control Box

“Benchmark” Log Book

As part of the industry-wide “Benchmark” initiative all Baxi boilers now
include an Installation, Commissioning and Service Record Log Book.
Please read the Log Book carefully and complete all sections relevant to
the appliance and installation. These include sections on the type of
controls employed, flushing the system, burner operating pressure etc.
The details of the Log Book will be required in the event of any warranty
work. Also, there is a section to be completed at each subsequent regular
service visit. The Log Book must be left with the user.

Case Front Panel

NOTE: This appliance must be installed in
accordance with the manufacturer’s instructions
and the regulations in force.Read the instructions
fully before installing or using the appliance.

2.0 General Layout

5

2.1 Layout

1. Air Pressure Switch

2. Expansion Vessel

3. Burner Manifold

4. Automatic Air Vent

5. DHW Plate Heat Exchanger

6. Circulation Pump

7. Drain Off Point

8. Pressure Relief Valve

9. Optional Integral Timer

10. Central Heating System Pressure Gauge

11. PCB

12. Control Box

13. 3-Way Valve Assembly

14. Spark Generator

15. Flame Sensing Electrode

16. Spark Electrode

17. Burner

18. Primary Heat Exchanger

19. Fan Assembly

20. On/Off/Reset Selector Switch

21. Central Heating Temperature Control

22. Hot Water Temperature Control

23. Flame Failure

24. Safety Thermostat

25. Fault on Fan or Flue

26. Fault on Pump or Low System Pressure

27. Fault on Hot Water Sensor

28. Fault on Central Heating Sensor

29. Power On

30. Domestic Hot Water Mode

31. Central Heating Mode

32. Burner On

When neons 23 to 28 are constantly illuminated,
they indicate the temperature of the central heating
water.

19

18

17

14

15

16

13

12

11

10

9

20

21

22

10

9

7

6

3

4

5

8

2

1

30° 40° 50° 60° 70° 80°

2

1

0

4

3

bar

30° 40° 50° 60° 70° 80°

23 24

25

26 27

28

29

30 31 32

3.0 Appliance Operation

6

NOTE: All delay timers mentioned in 3.1 and 3.2
are overridden by domestic hot water demand.

3.1 Central Heating Mode (Fig. 2)

1. With a demand for heating, the pump circulates
water through the primary circuit. At a pre­determined flow rate the central heating flow
switch operates, initiating the ignition sequence.

2. The main burner ignites at low rate, then the
gas valve controls the gas rate to maintain the
heating temperature measured by the
temperature sensor.

3. When the flow temperature exceeds the setting
temperature, a 3 minute delay occurs before the
burner relights automatically (anti-cycling). The
pump continues to run during this period.

4. When the demand is satisfied the burner is
extinguished and the pump continues to run for a
period of 3 minutes (Pump Overrun).

3.2 Domestic Hot Water Mode (Fig. 3)

1. Priority is given to the domestic hot water
supply. A demand at a tap or shower will override
any central heating requirement.

2. The flow of water will operate the DHW flow
switch which requests the 3 way valve to change
position. This will allow the pump to circulate the
primary water through the DHW plate heat
exchanger.

3. The burner will light automatically and the
temperature of the domestic hot water is
controlled by the temperature sensor.

4. When the domestic hot water demand ceases
the burner will extinguish and the diverter valve
will remain in the domestic hot water mode,
unless there is a demand for central heating.

IMPORTANT: When the selector switch is in
the ‘0’ (Off) position the electrical supply to the
boiler is isolated. The boiler will not operate
and the integral timer (if fitted) will require
resetting once the selector switch is set to
either Position (i) or Position (ii).

3.3 Frost Protection Mode

1. The frost protection mode is integral to the
appliance and functions only with the selector
switch (see Section 2.1) in the domestic hot water
and central heating position. If the system
temperature falls below 5° C then the boiler will
fire on its minimum setting until a flow temperature
of 30° C is reached. Further protection can be
incorporated by using a system frost thermostat.

3.4 Pump Protection

1. With the selector switch (see Section 2.1) in
either the central heating or central heating and
domestic hot water position the pump will
automatically operate for 1 minute in every 24
hours to prevent sticking.

1

2

4

5 6

7

8

9

10

11

1213141516

17

18

19

20

21

22

23

24

25

26

3

1 Primary Heat Exchanger
2 Burner
3 Ignition Electrode
4 Flame Sensing Electrode
5 Gas Valve
6Pump
7 Automatic Air Vent
8 Plate Heat Exchanger
9 Flow Sensor with Filter
10 Pressure Relief Valve
11 Boiler Drain Point
12 Heating Return
13 Cold Water Inlet On/Off Valve and Filter

14 Gas Inlet
15 Domestic Hot Water Outlet
16 Heating Flow
17 Pressure Gauge
18 Hydraulic Differential Pressure Sensor Microswitch
19 Automatic By-Pass
20 Hydraulic Differential Pressure Sensor
21 Diverter Valve Assembly
22 Domestic Hot Water Flow Priority Assembly
23 Domestic Hot Water Flow Priority Microswitch
24 Safety Thermostat
25 Central Heating Temperature Sensor
26 Expansion Vessel
27 Domestic Hot Water Temperature Sensor

Key

Central Heating Circuit

Domestic Hot Water Circuit

Fig. 3

1

2

4

5 6

7

8

9

10

11

1213141516

17

18

19

20

21

22

23

24

25

26

3

Fig. 2

27

27

4.0 Technical Data

7

Flue Terminal Diameter 100mm
Dimensions Projection 95mm

Outercase Dimensions

Casing Height - 780mm
Overall Height Inc Flue
Elbow - 980mm
Casing Width - 450mm
Casing Depth - 345mm

Clearances

Both Sides 5 mm Min
Above Casing 200 mm Min
Below Casing 200 mm Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)

Weights kg
Packaged Boiler Carton 47
Packaged Flue Kit 3
Installation Lift Weight 39

Central Heating Primary Circuit
Pressures

bar

Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommend Operating 1-2

DHW Circuit bar
Pressures

Max Operating 8
Min Operating 0.2

Min Operating Pressure
at 9.8 l/min 0.9

Flow Rates l/min
DHW Flow Rate
@ 30°C Rise 13.7

DHW Flow Rate
@ 35°C Rise 9.8

Min Working
DHW Flow Rate 2.5

Pump

Available Head See graph below

Expansion Vessel - (For Central Heating
only. Integral with appliance)

bar

Min Pre-charge Pressure 0.5

litre
Max Capacity of
CH System 125

Primary Water Content 1.0
of Boiler (unpressurised)

Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Cold Water Mains Inlet - 15mm
DHW Flow - 15mm
Pressure Relief Discharge - 15mm

Temperatures

C.H. Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

D.H.W. Flow Temp (adjustable)

35°C to 65°C max (± 5°C)
dependent upon flow rate

Heat Input C/H & DHW (Gross)

Max Min

kW 26.3 10.6

Btu/h 89,739 31,738

Heat Output Max Min

kW 24.0 9.3

Btu/h 81,891 31,738

Electrical Supply 230V~ 50H

z

(Appliance must be connected to an
earthed supply)

Power Consumption 170W

External Fuse Rating 3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

Appliance Category CAT II

2H 3+

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

m3/h 2.78

ft3/h 98.12

Inlet Pressure (Natural Gas - G20)

mbar 20

in wg 8

Burner Injector (Natural Gas - G20)

12 x 1.28mm Diameter

Burner Pressure (Natural Gas - G20)

Max Rate Min Rate

mbar 12.2 ± 0.5 2.5 ± 0.2

in wg 4.88 ± 0.2 1.0 ± 0.2

Appliance Type C

12

C

32

NOxClass 3

This value is used in the UK Government’s Standard

Assessment Procedure (SAP) for energy rating of dwellings.

The test data from which it has been calculated have been

certified by 0051.

SEDBUK Declaration For Combi 80e

The seasonal efficiency (SEDBUK) is 78.6 %

Electrical Protection

IPX5D

4.1 Combi 80e

LPG Gases Propane - G31 and

Butane - G30

Burner Injector 12 x 0.77mm diameter
Burner Pressure

Propane mbar

in wg

Butane mbar

in wg

Inlet Pressures

mbar
in wg

Max Rate

36.2

14.5

28.3

11.3

Min Rate

6.4

2.6

5.3

2.1

Propane

37

14.8

Butane

28

11.2

4

3.5

3

2.5

2

Metre wg

1.5

1

0.5

0

l/h

Pump - Available Head

200 400 600 800 1000 1200

0

4.0 Technical Data

8

4.2 Combi 105e

Flue Terminal Diameter 100mm
Dimensions Projection 95mm

Outercase Dimensions

Casing Height - 780mm
Overall Height Inc Flue
Elbow - 980mm
Casing Width - 450mm
Casing Depth - 345mm

Clearances

Both Sides 5 mm Min
Above Casing 200 mm Min
Below Casing 200 mm Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)

Weights kg
Packaged Boiler Carton 49
Packaged Flue Kit 3
Installation Lift Weight 41

Central Heating Primary Circuit
Pressures

bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommend Operating 1-2

DHW Circuit bar
Pressures

Max Operating 8
Min Operating 0.2

Min Operating Pressure
at 12.7 l/min 0.96

Flow Rates l/min
DHW Flow Rate
@ 30°C Rise 14.8

DHW Flow Rate
@ 35°C Rise 12.7

Min Working
DHW Flow Rate 2.5

Pump

Available Head See graph below

Expansion Vessel - (For Central Heating
only. Integral with appliance)

bar

Min Pre-charge Pressure 0.5

litre
Max Capacity of
CH System 125

Primary Water Content 1.2
of Boiler (unpressurised)

Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Cold Water Mains Inlet - 15mm
DHW Flow - 15mm
Pressure Relief Discharge - 15mm

Temperatures

C.H. Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

D.H.W. Flow Temp (adjustable)

35°C to 65°C max (± 5°C)
dependent upon flow rate

Heat Input C/H & DHW (Gross)

Max Min

kW 34.3 11.9

Btu/h 117,036 40,610

Heat Output Max Min

kW 31.0 10.4

Btu/h 105,776 35,490

Electrical Supply 230V~ 50H

z

(Appliance must be connected to an
earthed supply)

Power Consumption 190W

External Fuse Rating 3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

Appliance Category CAT II

2H 3P

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

m3/h 3.63

ft3/h 128.12

Inlet Pressure (Natural Gas - G20)

mbar 20

in wg 8

Burner Injector (Natural Gas - G20)

15 x 1.28mm Diameter

Burner Pressure (Natural Gas - G20)

Max Rate Min Rate

mbar 13.4 ± 0.5 1.8 ± 0.2

in wg 5.36 ± 0.2 0.72 ± 0.2

Appliance Type C

12

C

32

NOxClass 3

Electrical Protection

IPX5D

This value is used in the UK Government’s Standard

Assessment Procedure (SAP) for energy rating of dwellings.

The test data from which it has been calculated have been

certified by 0051.

SEDBUK Declaration For Combi 105e

The seasonal efficiency (SEDBUK) is 78.5 %

0

200 400 600 800 1000 1200

0.5

1

1.5

2

2.5

3

3.5

4

Metre wg

l/h

Pump - Available Head

0

5

4.5

LPG Gases Propane - G31

Burner Injector

15 x 0.77mm diameter

Burner Pressure

Propane mbar

in wg

Inlet Pressures

mbar
in wg

Max Rate

36.2

14.5

Min Rate

6.4

2.6

37

5.0 Dimensions and Fixings

9

Dimensions

A 780mm

B 345mm

C 450mm

D 107mm Ø Min.

E 200mm

F 190mm

G 143mm

360° Orientation

Tube Ø 100mm

D

C

B

A

E

G

F

Domestic Hot

Water Outlet

(15mm)

Cold Water

Inlet

(15mm)

Heating

Return

(22mm)

Heating

Flow

(22mm)

Pressure Relief

Valve

(15mm)

Gas

Inlet

(22mm)

65 mm

65 mm 65 mm

65 mm

65 mm

Tap Rail

6.0 System Details

10

6.1 Information

1. The Baxi Combi 80e and 105e Combination Boilers
are ‘Water Byelaws Scheme - Approved Products’.
To comply with the Water Byelaws your attention is
drawn to the following installation requirements and
notes (IRN).

a) IRN 001 - See text of entry for installation

requirements and notes.

b) IRN 302 - Byelaw 14.

2. Reference to the WRc publications, ‘Water fittings
and materials directory’ and ‘Water supply byelaws
guide’ give full details of byelaws and the IRNs.

6.2 Central Heating Circuit

1. The appliance is suitable for fully pumped SEALED
SYSTEMS ONLY.

Treatment of Water Circulating Systems

• All recirculatory water systems will be subject to

corrosion unless an appropriate water treatment is
applied. This means that the efficiency of the system
will deteriorate as corrosion sludge accumulates
within the system, risking damage to pump and
valves, boiler noise and circulation problems.

• For optimum performance after installation this

boiler and its associated central heating system must
be flushed in accordance with the guidelines given in
BS 7593 “Treatment of water in domestic hot water
central heating systems”.

• This must involve the use of a proprietary cleanser,

such as BetzDearborn Sentinel X300 or X400, or
Fernox Superfloc. Full instructions are supplied with
the products, but for immediate information please
contact BetzDearborn (0151 420 9563) or Fernox
(01799 550 811) directly.

• For long term protection against corrosion and

scale, after flushing it is recommended that an
inhibitor such as BetzDearborn Sentinel X100, or
Fernox MB-1 or Copal is dosed in accordance with
the guidelines given in BS 7593.

Failure to flush and add inhibitor to the system
may invalidate the appliance warranty.

• It is important to check the inhibitor concentration

after installation, system modification and at every
service in accordance with the manufacturer’s
instructions. (Test kits are available from inhibitor
stockists.)

• For information or advice regarding any of the

above contact the Baxi Helpline.

6.3 Bypass

1. The boiler is fitted with an automatic integral
bypass.

6.4 System Control

1. The boiler is designed for use in a heating
system that incorporates external controls, i.e. a
minimum of a timer device.

2. Suitable timer kits are available as optional
extras.

3. For optimum operating conditions and maximum
economy the fitting of a programmable room
thermostat, such as the Baxi Combi Controller, is
recommended.

6.0 System Details

11

6.5 System Filling and Pressurising

1. A filling point connection on the central heating
return pipework must be provided to facilitate
initial filling and pressurising and also any
subsequent water loss replacement/refilling.

2. There are connection points on the mains cold
water inlet and central heating return isolating
taps Fig. 4a) to which the optional filling loop kit
(Part No. 248221) can be assembled.

3. The filling method adopted must be in
accordance with the Water Supply (Water
Fittings) regulations and the Water Bylaws
(Scotland).

4. Your attention is drawn to: Paragraph 24 of
Schedule 2 Section 8 of the publication Water
Regulations Guide which gives recommendations
and guidance on approved methods for filling
sealed systems.

5. The sealed primary circuits may be filled or
replenished by means of a temporary connection
between the primary circuit and a supply pipe
provided the arrangement in accordance with
Diagram R24.2a of the Water Regulations Guide.

6. The temporary hose must be completely
removed at both ends after use.

6.6 Expansion Vessel

(Central Heating only)

1. The appliance expansion vessel is pre-charged
to 0.5 bar. Therefore, the minimum cold fill
pressure is 0.5 bar. The vessel is suitable for
correct operation for system capacities up to 125
litres. For greater system capacities an additional
expansion vessel must be fitted - refer to BS 7074
Pt 1.

6.7 Pressure Relief Valve (Fig. 5)

1. The pressure relief valve is set at 3 bar,
therefore all pipework, fittings, etc. should be
suitable for pressures in excess of 3 bar.

2. The pressure relief discharge pipe should be
not less than 15mm dia, run continuously
downward, and discharge outside the building,
preferably over a drain. It should be routed in
such a manner that no hazard occurs to
occupants or causes damage to wiring or
electrical components. The end of the pipe should
terminate facing down and towards the wall.

3. The discharge must not be above a window,
entrance or other public access. Consideration
must be given to the possibility that boiling
water/steam could discharge from the pipe.

Fig. 4

Fig. 5

Stop
Valve

Double
Check
Valve

DHW
Mains
Inlet

CH
Return

Temporary
Hose

Pressure Relief Valve

Discharge Pipe

Filling Loop

Fig. 4a

Stop
Valve

6.0 System Details

12

6.8 Domestic Hot Water Circuit (Fig. 6)

1. All DHW circuits, connections, fittings, etc.
should be fully in accordance with relevant
standards, the Water Supply (water fittings)
Regulations and the Water Bylaws (Scotland).

2. Your attention is drawn to:
Schedule 2, Section 6 of the Publication Water
Regulations Guide which relates to backflow
prevention.

3. A single check valve must be fitted as shown in
Fig. 6 to prevent backflow to the supply pipe and
to ensure the efficient operation of the expansion
vessel which is required to accommodate the
thermal expansion of the water.

4. When the domestic water system includes any
device which prevents water expanding back
towards the supply (check valve, loose jumpered
stopcock, water meter, water treatment device)
then an expansion vessel must be fitted (eg.
Zilmet 160ml, R

1

/215bar).

5. If the hot water expansion is not provided for,
then high pressures can develop which may
result in damage to fittings and devices on the
system.

6. The boiler’s maximum working mains pressure
is 8 bar, therefore all pipework, connections,
fittings, etc. should be suitable for pressures in
excess of 8 bar. A pressure reducing valve must
be fitted for pressures in excess of 8 bar. The
manufacturer of any outlet fittings, such as a
shower valve, may require a lower maximum
pressure. The pressure reduction must take
account of all fittings connected to the DHW
system.

6.9 Showers

1. If a shower control is supplied from the
appliance it should be of the thermostatic or
pressure balanced type. Thermostatic type
shower valves provide the best comfort and
guard against water at too high a temperature.
Existing controls may not be suitable - refer to the
shower valve manufacturer.

6.10 Hard Water Areas

1. If the area of the installation is recognised as a
HARD WATER AREA then a suitable device
should be fitted to treat the mains water supply to
the boiler.

Boiler

Other Tap
Outlets

Expansion
Vessel

To Hot
Taps

Check
Valve

Pressure
Reducer Valve

Stop Tap

Fig. 6

7.0 Site Requirements

13

7.1 Information

1. The installation must be carried out by a CORGI
Registered Installer or other registered competent
person and be in accordance with the relevant
requirements of the current G

AS SAFETY (Installation

and Use) R

EGULATIONS, the BUILDING REGULATIONS

(Scotland)(Consolidation), the LOCAL BUILDING
REGULATIONS, the current I.E.E. WIRING REGULATIONS

and the bye laws of the LOCAL WATER UNDERTAKING.
Where no specific instruction is given reference
should be made to the relevant BRITISH
STANDARD CODES OF PRACTICE. For Ireland
install in accordance with IS 813 “I

NSTALLATION OF

GAS APPLIANCES”.

7.2 B.S. Codes of Practice

Standard Scope

BS 6891 Gas Installation.
BS 5546 Installation of hot water supplies for

domestic purposes.
BS 5449 Part 1 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5440 Part 1 Flues.
BS 5440 Part 2 Ventilation.
BS 7074 Expansion vessels and ancillary

equipment for sealed water systems.
BS 7593 Treatment of water in domestic hot water

central heating systems.

WARNING - The addition of anything that may
interfere with the normal operation of the
appliance without the express written permission
of Baxi UK Limited could invalidate the appliance
warranty and infringe the G

AS SAFETY (Installation

and Use) R

EGULATIONS.

7.3 Clearances (Figs. 7 & 8)

1. A flat vertical area is required for the installation
of the boiler.

2. These dimensions include the necessary
clearances around the boiler for case removal,
spanner access and air movement. Additional
clearances may be required for the passage of
pipes around local obstructions such as joists
running parallel to the front face of the boiler.

7.4 Location

1. The boiler may be fitted to any suitable wall with the
flue passing through an outside wall or roof and
discharging to atmosphere in a position permitting
satisfactory removal of combustion products and
providing an adequate air supply. The boiler should be
fitted within the building unless otherwise protected by
a suitable enclosure i.e. garage or outhouse. (The
boiler may be fitted inside a cupboard-see Section 7.5).

2. If the boiler is sited in an unheated enclosure then it
is recommended to leave the ON/OFF Selector Switch
in the domestic hot water and central heating position
to give frost protection.

3. If the boiler is fitted in a room containing a bath or
shower reference must be made to the current I.E.E.
WIRING REGULATIONS and BUILDING REGULATIONS. If the
boiler is to be fitted into a building of timber frame
construction then reference must be made to the
current edition of Institute of Gas Engineers Publication
IGE/UP/7 (Gas Installations in Timber Framed
Housing).

200mm Min

780mm

450mm

200mm Min

5mm Min

5mm Min

5mm Min

450mm Min

For Servicing

Purposes

Fig. 7

Fig. 8

In Operation

7.0 Site Requirements

14

7.5 Ventilation of Compartments

1. Where the appliance is installed in a cupboard
or compartment, no air vents are required.

2. BS 5440: Part 2 Clause 4.2 refers to room
sealed appliances installed in compartments. The
appliance will run sufficiently cool without
ventilation.

7.6 Gas Supply

1. The gas installation should be in accordance
with BS6891.

2. The connection to the appliance is a 22mm
copper tail located at the rear of the gas service
cock (Fig. 9).

3. Ensure that the pipework from the meter to the
appliance is of adequate size. Do not use pipes of
a smaller diameter than the boiler gas connection
(22mm).

7.7 Electrical Supply

1. External wiring must be correctly earthed,
polarised and in accordance with current I.E.E.

W

IRING REGULATIONS.

2. The mains supply is 230V ~ 50Hzfused at 3A.

NOTE: The method of connection to the
electricity supply must facilitate complete
electrical isolation of the appliance.

Connection may be via a fused double-pole
isolator with a contact separation of at least
3mm in all poles and servicing the boiler and
system controls only.

Fig. 9

Gas Service Cock