Baxi Megaflo System HE A Range Release note

© Baxi Heating UK Ltd 2013
Megaflo System HE ARange
Gas Fired Wall Mounted Condensing Boiler
Installation & Servicing Instructions
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.

2© Baxi Heating UK Ltd 2013
Building Regulations and the Benchmark Commissioning
Checklist
Building Regulations (England & Wales) require notification of
the installation of a heating appliance to the relevant Local
Authority Building Control Department. From 1 April 2005 this
can be achieved via a Competent Persons Self Certification
Scheme as an option to notifying the Local Authority directly.
Similar arrangements will follow for Scotland and will apply in
Northern Ireland from 1 January 2006.
The Health & Safety Executive operates the ‘Gas Safe Register’,
a self-certification scheme for gas heating appliances.
These arrangements represent a change from the situation
whereby compliance with Building Regulations was accepted as
being demonstrated by completion of the Benchmark Logbook
(which was then left on site with the customer).
With the introduction of Self Certification Schemes, the
Benchmark Logbook is being withdrawn. However, a similar
document in the form of a commissioning checklist and service
interval record is incorporated at the back of these instructions.
This company is a member of the Benchmark initiative and fully
supports the aims of the programme. Its aim is to improve the
standards of installation and commissioning of central heating
systems in the UK and to encourage the regular servicing of all
central heating systems to ensure safety and efficiency.
Building Regulations require that installations should comply
with manufacturer's instructions. It is therefore important that
the commissioning checklist is completed by the installer. The
relevant section of Building Regulations only relates to
dwellings. Therefore the checklist only applies if the appliance is
being installed in a dwelling or some related structure.
The flowchart opposite gives guidance for installers on the
process necessary to ensure compliance with Building
Regulations.
© Baxi Heating UK Ltd 2013 All rights reserved. No part of this publication may
be reproduced or transmitted in any form or by any means, or stored in any
retrieval system of any nature (including in any database), in each case whether
electronic, mechanical, recording or otherwise, without the prior written
permission of the copyright owner, except for permitted fair dealing under
Copyrights, Designs and Patents Act 1988.
Applications for the copyright owner’s permission to reproduce or make other
use of any part of this publication should be made, giving details of the proposed
use, to the following address:
The Company Secretary, Baxi Heating UK Ltd,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
WARNING: Any person who does any unauthorised act in relation to a
copyright work may be liable to criminal prosecution and civil claims for damages.
Natural Gas
Baxi Megaflo System 15 HE A
G.C.No41 075 55
Baxi Megaflo System 18 HE A
G.C.No41 075 56
Baxi Megaflo System 24 HE A
G.C.No41 075 57
Baxi Megaflo System 28 HE A
G.C.No41 075 58
Baxi Megaflo System 32 HE A
G.C.No41 075 59
0086
ISO 9001
FM 00866
The Benchmark Scheme
Benchmark places responsibilities on both manufacturers and installers. The
purpose is to ensure that customers are provided with the correct equipment for
their needs, that it is installed, commissioned and serviced in accordance with the
manufacturer’s instructions by competent persons and that it meets the
requirements of the appropriate Building Regulations. The Benchmark Checklist
can be used to demonstrate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work
in accordance with the Benchmark Code of Practice which is available from the
Heating and Hotwater Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.

3
Installer Notification Guidelines
© Baxi Heating UK Ltd 2013
Choose Building
Regulations Notification
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
and will issue a
certificate of compliance
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Competent Person's
Self Certification Scheme
Building Control
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions

4
Legislation
© Baxi Heating UK Ltd 2013
Codes of Practice - refer to the most recent version
IMPORTANT - Installation, Commissioning, Service & Repair
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.
In GB, this must be carried out by a competent person as stated in the Gas Safety
(Installation & Use) Regulations.
Definition of competence: A person who works for a Gas Safe registered company
and holding current certificates in the relevant ACS modules, is deemed competent.
In IE, this must be carried out by a competent person as stated in I.S. 813 “Domestic
Gas Installations”.
The addition of anything that may interfere with the normal operation of the appliance
without express written permission from the manufacturer or his agent could invalidate
the appliance warranty. In GB this could also infringe the Gas Safety (Installation and
Use) Regulations.
Warning - Check the information on the data plate is compatible with local supply
conditions.
This company declare that no substances harmful to health
are contained in the appliance or used during appliance
manufacture.
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force, and
only used in a suitably ventilated location.
In GB, the installation must be carried out by a Gas Safe
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
• Gas Safety (Installation & Use) Regulations.
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current edition of
I.S. 813 ‘Domestic Gas Installations’, the current Building
Regulations and reference should be made to the current ETCI
rules for electrical installation.
All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)
Regulations 1993 No3083” 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 0085.
Product/Production certified by:
Notified Bodies 0085 & 0086.
For GB/IE only.
All Gas Safe registered engineers carry an ID card with their licence number and a
photograph. You can check your engineer is registered by telephoning
0800 408 5500 or online at www.gassaferegister.co.uk
In GB the following Codes of Practice apply:
Standard Scope
BS 6891 Gas Installation.
BS 5546 Installation of hot water supplies for domestic
purposes.
BS EN 12828 Heating systems in buildings.
BS EN 14336 Installation & commissioning of water based
heating 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.
In IE the following Codes of Practice apply:
Standard Scope
I.S. 813 Domestic Gas Installations.
The following standards give valuable additional information;
BS 5546 Installation of hot water supplies for domestic
purposes.
BS EN 12828 Heating systems in buildings.
BS EN 14336 Installation & commissioning of water based
heating systems.
BS 7074 Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593 Treatment of water in domestic hot water
central heating systems.

5
Safe Manual Handling
© Baxi Heating UK Ltd 2013
General
The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance.
Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly shoulders, arms and hands.
Health & Safety is the responsibility of EVERYONE.
There is no ‘safe’ limit for one man - each person has different capabilities. The boiler should be handled and lifted by TWO PEOPLE.
Do not handle or lift unless you feel physically able.
Wear appropriate Personal Protection Equipment e.g. protective gloves, safety footwear etc.
Preparation
Co-ordinate movements - know where, and when, you are both going.
Minimise the number of times needed to move the boiler - plan ahead.
Always ensure when handling or lifting the route is clear and unobstructed. If possible avoid steps, wet or slippery surfaces, unlit areas etc. and take special care
on ladders/into lofts.
Technique
When handling or lifting always use safe techniques - keep your back straight, bend your knees. Don’t twist - move your feet, avoid bending forwards and
sideways and keep the load as close to your body as possible.
Where possible transport the boiler using a sack truck or other suitable trolley.
Always grip the boiler firmly, and before lifting feel where the weight is concentrated to establish the centre of gravity, repositioning yourself as necessary. See the
‘Installation’ section of these instructions for recommended lift points.
Remember
The circumstances of each installation are different. Always asses the risks associated with handling and lifting according to the individual conditions.
If at any time when installing the boiler you feel that you may have injured yourself STOP !!
DO NOT ‘work through’ the pain - you may cause further injury.
IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER - OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !!

6© Baxi Heating UK Ltd 2013
CONTENTS
1.0 Introduction 7
2.0 General Layout 8
3.0 Appliance Operation 9
4.0 Technical Data 10
5.0 Dimensions and Fixings 11
6.0 System Details 12
7.0 Site Requirements 14
8.0 Flue Options 20
9.0 Plume Displacement 25
10.0 Installation 29
11.0 Commissioning 34
12.0 Completion 36
13.0 Servicing 37
14.0 Changing Components 39
15.0 Setting the Gas Valve 46
16.0 Electrical 47
17.0 Short Parts List 48
18.0 Fault Finding 49
Benchmark Checklist 54
Section Page

7
1.0 Introduction
© Baxi Heating UK Ltd 2013
1.1 Description
1. The Baxi Megaflo System HE Ais a fully automatic gas fired
wall mounted condensing system boiler. It is room sealed and
fan assisted.
2. The boiler is set to give a maximum output of :-
15 models - 15 kW
16.2 kW (Condensing)
18 models - 18 kW
19.4 kW (Condensing)
24 models - 24 kW
25.9 kW (Condensing)
28 models - 28 kW
30.3 kW (Condensing)
32 models - 32 kW
34.4 kW (Condensing)
3. It is designed for use on Natural Gas (G20).
4. The boiler incorporates a circulating pump and expansion
vessel. It is suitable for use only on fully pumped sealed
systems.
5. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the inner
door panel. It is visible when the case front panel is removed
(Fig. 1).
6. The boiler model name and serial number are also shown
on the information label on the rear of the lower door panel.
This is for user reference.
7. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed meter supply only.
8. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal telescopic flue
kit, part no. 5118069.
9. All systems must be thoroughly flushed and treated with
inhibitor (see section 6.1).
IMPORTANT: If the boiler is installed at a high point in the
system it is strongly recommended that Automatic Air
Vent Kit 7200047 - 01 is fitted.
1.2 Contents of Pack
The pack contains:-
• Boiler
• Wall Plate (including taps)
• Set of Pipe Connections
• Template & ‘Quick Fit’ Guide
• Literature Pack
Fig. 1
Control Box
Case Front Panel
Data Badge
Information Label

8
2.0 General Layout
© Baxi Heating UK Ltd 2013
2.1 Layout
1. Expansion Vessel
2. Automatic Air Vent
3. Circulation Pump
4. Drain Off Point
5. Pressure Relief Valve
6. Selector Switch
7. Central Heating System Pressure Gauge
8. PCB
9. Control Box
10. Gas Valve
11. Condensate Trap
12. Flame Sensing Electrode
13. Spark Electrode
14. Primary Heat Exchanger
15. Fan Assembly
16. On/Off/Reset Selector Switch
17. Central Heating Temperature Control
18. Calibration Control
19. Venturi
20. Air/Gas Collector
21. Combustion Box Cover & Burner
22. Igniter
23. Burner On Light
24. Central Heating Mode Light
25. Display
1
16 17 18 7
bar
0
1
2
3
4
21
2
3
4
5
6
7
8
9
10
11
12
13
14
15
19
20
22
23
24
25

9
3.0 Appliance Operation
© Baxi Heating UK Ltd 2013
3.1 Operating Mode (Fig. 2)
1. With a demand for heating or hot water, the pump
circulates water through the primary circuit. If the pressure is
at least 0.5 bar the ignition sequence will start.
2. 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.
3. When the demand is satisfied the burner is extinguished
and the pump continues to run for a period of 3 minutes
(Pump Overrun).
IMPORTANT: When the selector switch is in the ‘0’
(Off) position the electrical supply to the boiler is
isolated. The boiler will not operate.
3.2 Frost Protection Mode
1. The frost protection mode is integral to the appliance and
functions when the selector switch (see Section 2.1) is in the
ON 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.
3.3 Pump Protection
1. With the selector switch (see Section 2.1) in the ON
position ( ) the pump will automatically operate for 1
minute in every 24 hours to prevent sticking.
1
2
4
5
6
7
8
19
18
9
10 1211
14
13
15
16
17
3
Key
1 Heat Exchanger
2 Burner
3 Ignition Electrode
4 Flame Sensing Electrode
5GasValve
6Pump
7 Automatic Air Vent
8 Pressure Relief Valve
9 Boiler Drain Point
10 Gas Inlet
11 Boiler Flow
12 Boiler Return
13 Pressure Gauge
14 Automatic By-Pass
15 Water Pressure Sensor
16 Safety Thermostat
17 Temperature Sensor
18 Expansion Vessel
19 Return Temperature Sensor
20 Fan
Boiler Primary Circuit
Fig. 2
20

10 © Baxi Heating UK Ltd 2013
This value is used in the UK Government’s Standard Assessment Procedure
(SAP 2005) for energy rating of dwellings. The test data from which it has
been calculated have been certified by 0087.
SEDBUK (SAP) Declaration
The seasonal efficiency (SEDBUK) for all models is:-
91.2% Band A
4.0 Technical Data
4.1 Megaflo System 15, 18, 24, 28 & 32 HE A
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 780mm
Overall Height Inc Flue Elbow - 965mm
Casing Width - 450mm
Casing Depth - 345mm
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommended Operating Range 1-2
Pump
Available Head See graph below
Expansion Vessel - (Integral with appliance)
bar
Min Pre-charge Pressure 0.5
litre
Max Capacity of
CH System 125
Primary Water Content
of Boiler (unpressurised) 2.5
Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Pressure Relief Discharge - 15mm
Temperatures
Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
NOxClass 5
0
200 400 600 800 1000 1200
0.5
1
1.5
2
2.5
3
3.5
4
Metre (wg)
Flow Rate (l/h)
Pump - Available Head
0
5
5.5
4.5
Clearances
Above Casing 200 mm Min
Below Casing 150 mm Min*
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)
L.H. Side 5 mm Min
R.H. Side 5 mm Min (In Operation)
*This is the MINIMUM recommended dimension.
A greater clearance will aid installation and maintenance.
Heat Input (Net) Max Min
15 model kW 15.4 4
18 model kW 18.5 4.3
24 model kW 24.7 7
28 model kW 28.9 9.7
32 model kW 32.8 9.7
Heat Output (Non-Condensing)
Max Min
15 model kW 15 3.9
18 model kW 18 4.2
24 model kW 24 6.8
28 model kW 28 9.4
32 model kW 32 9.4
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption
15 model 130W
18 model 140W
24 model 150W
28 & 32 models 160W
Electrical Protection
IPX5D
Internal Fuse Rating F2L
Appliance Category CAT I 2H
Inlet Pressure (Natural Gas - G20)
mbar 20
Injector (Natural Gas - G20)
15 model 4.5mm
18 model 5.7mm
24 model 7.5mm
28 model 12mm
32 model 12mm
Appliance Type C13 C33 C53
Heat Output (Condensing)
Max Min
15 model kW 16.2 4.2
18 model kW 19.4 4.5
24 model kW 25.9 7.4
28 model kW 30.3 10.2
32 model kW 34.4 10.2
Max Gas Rate (Natural Gas - G20)
(After 10 mins)
15 model m3/h 1.69
18 model m3/h 1.95
24 model m3/h 2.61
28 model m3/h 3.1
32 model m3/h 3.48
Condensate Drain
To accept 21.5mm (3/4in) plastic waste pipe
Heat Input (Gross) Max Min
15 model kW 17.1 4.4
18 model kW 20.5 4.8
24 model kW 27.4 7.8
28 model kW 32.1 10.8
32 model kW 36.4 10.8
External Fuse Rating 3A
Weights
15 & 18 24
Packaged Boiler Carton 43.6kg 44.2kg
Installation Lift Weight 38.6kg 39.2kg
28 & 32
Packaged Boiler Carton 46kg
Installation Lift Weight 41kg
NOTE: All data in this section are nominal values
and subject to normal production tolerances.

11
5.0 Dimensions and Fixings
© Baxi Heating UK Ltd 2013
360° Orientation
Tube Ø 100mm
DC
B
A
E
G
F
At least 1.5°
H
Heating
Return
(22mm)
Heating
Flow
(22mm)
Pressure Relief
Valve
(15mm)
Gas
Inlet
(22mm)
130 mm 130 mm 65 mm
Condensate
Drain
32.5 mm
Tap Rail
Dimensions
A780mm
B345mm
C450mm
D116mm Ø Min.
E185mm
(207mm for 80/125mm
flue systems)
F145mm
G131mm
H180mm

12
6.0 System Details
© Baxi Heating UK Ltd 2013
6.1 Central Heating Circuit
1. The appliance is suitable for fully pumped SEALED SYSTEMS
ONLY.
Treatment of Water Circulating Systems
1. All recirculatory water systems will be subject to corrosion
unless they are flushed and an appropriate water treatment is
applied. To prevent this, follow the guidelines given in BS
7593 “Treatment of Water in Domestic Hot Water Central
Heating Systems” and the treatment manufacturers
instructions.
2. Treatment must involve the use of a proprietary cleanser,
such as Sentinel X300 or X400, or Fernox F3 and an inhibitor
such as Sentinel X100 or Fernox MB-1.
3. Full instructions are supplied with the products, for further
information contact Sentinel (0800 389 4670) or Fernox
(0870 870 0362).
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.
4. It is important to check the inhibitor concentration after
installation, system modification and at every service in
accordance with the inhibitor manufacturer’s instructions.
(Test kits are available from inhibitor stockists.)
5. For information or advice regarding any of the above
contact Technical Enquiries 0844 871 1555.
6.2 Bypass
1. The boiler is fitted with an automatic integral bypass.
6.3 System Control
1. For optimum operating conditions, the heating system into
which the boiler is installed should include a control system.
2. Such a system will comprise of a timer control and separate
room or cylinder thermostats as appropriate.
3. The boiler should be controlled so that it operates on
demand only.
4. Operation of the system under control of the boiler
thermostat & TRV’s only does not produce the best results.

13
6.0 System Details
© Baxi Heating UK Ltd 2013
6.4 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. The filling method adopted must be in accordance with all
relevant water supply regulations and use approved
equipment.
3. Your attention is drawn to:
for GB: Guidance G24.2 and recommendation R24.2 of the
Water Regulations Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
4. The sealed primary circuits may be filled or replenished by
means of a temporary connection between the circuit and a
supply pipe, provided a ‘Listed’ double check valve or some
other no less effective backflow prevention device is
permanently connected at the inlet to the circuit and the
temporary connection is removed after use.
IMPORTANT: If the boiler is installed at a high point in
the system it is strongly recommended that Automatic Air
Vent Kit 720004701 is fitted.
6.5 Expansion Vessel
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. For GB refer to BS 7074 Pt 1.
For IE, the current edition of I.S. 813 “Domestic Gas
Installations”.
6.6 Safety Pressure Relief Valve (Fig. 4)
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 and temperature in excess of 100°C.
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.
4. A remote relief valve kit is available to enable the boiler to
be installed in cellars or similar locations below outside
ground level (kit no. 5121379).
Fig. 3
Fig. 4
Stop
Valve
Double
Check
Valve
Mains
Cold
Water
CH
Return
Temporary
Hose
Safety Pressure
Relief Valve Discharge Pipe
Stop
Valve

14
7.0 Site Requirements
© Baxi Heating UK Ltd 2013
7.1 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 7.3).
2. If the boiler is sited in an unheated enclosure then it is
recommended to leave the ON/OFF Selector Switch in the
On position.
3. If the boiler is fitted in a room containing a bath or shower
reference must be made to the relevant requirements.
In GB this is the current I.E.E. Wiring Regulations and Building
Regulations.
In IE reference should be made to the current edition of I.S.
813 “Domestic Gas Installations” and the current ETCI rules.
4. 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).
7.2 Clearances (Figs. 5 & 6)
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.
*This is the MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
150mm Min*
780mm
450mm
200mm Min
(300mm Min if
using 80/125mm
flueing system)
5mm Min
5mm Min
450mm Min
For Servicing
Purposes
Fig. 5
Fig. 6
In Operation
5mm Min
At least 1.5°

15
7.0 Site Requirement
© Baxi Heating UK Ltd 2013
7.3 Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required.
2. BS 5440: Part 2 refers to room sealed appliances
installed in compartments. The appliance will run sufficiently
cool without ventilation.
7.4 Gas Supply
1. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891. In IE this is the
current edition of I.S. 813 “Domestic Gas Installations”.
2. The connection to the appliance is a 22mm copper tail
located at the rear of the gas service cock (Fig. 7).
3. Ensure that the pipework from the meter to the
appliance is of adequate size, and the demands of any
other gas appliances in the property are taken into
consideration. Do not use pipes of a smaller diameter than
the boiler gas connection (22mm).
7.5 Electrical Supply
1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In GB this is
the current I.E.E. Wiring Regulations. In IE reference should
be made to the current edition of ETCI rules.
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.
3. When the system includes an indirect domestic hot
water cylinder it is recommended that a cylinder
thermostat is used in conjunction with a 3 port 2 position
valve or 2 port zone valve.
7.6 Bath & Shower Rooms
1. If the boiler is fitted in a room containing a bath or
shower and NOT FITTED with any optional integral timer
or thermostat, it can be fitted in zone 2, (Figs. A & B shows
zone dimensions for a bathtub. For other examples refer to
the Current I.E.E. Wiring Regulations) reference must be
made to the relevant requirements.
In GB this is the current I.E.E. Wiring Regulations and
Building Regulations.
In IE reference should be made to the current edition of I.S.
813 “Domestic Gas Installations” and the current ETCI
rules.
Fig. 7
Gas Service Cock
Zone 2
Zone 1
Zone 0
Zone 2
Zone 2
Window
Recess
Window
Recess
0.6 m
Ceiling
Outside Zones
Zone 2
Zone 1
Zone 0
2.25 m
Window Recess
Zone 2
0.6 m
Fig. A
Fig. B
In GB Only
In GB Only

16
7.0 Site Requirements
© Baxi Heating UK Ltd 2013
7.7 Condensate Drain
FAILURE TO INSTALL THE CONDENSATE
DISCHARGE PIPEWORK CORRECTLY WILL AFFECT
THE RELIABLE OPERATION OF THE BOILER.
CAREFUL CONSIDERATION MUST BE GIVEN TO THE
POSSIBILITY OF THE PIPEWORK BEING SUBJECT TO
FREEZING CONDITIONS AND APPROPRIATE
MEASURES TAKEN TO PREVENT BLOCKAGE.
CORRECT INSTALLATION IN ACCORDANCE WITH
THIS SECTION WILL CONSIDERABLY MINIMISE THE
LIKELIHOOD OF BLOCKAGE AND SUBSEQUENT
BOILER LOCK-OUT.
A CONDENSATE DISCHARGE PUMP AND PIPE ‘TRACE
HEATING’ ARE AVAILABLE AS ACCESSORIES - see
paragraphs 7.7.12 to 7.715 for further details.
The condensate discharge pipe MUST NOT RISE at any
point along its length. There MUST be a fall of AT LEAST
2.5° (50mm per metre) along the entire run EXCEPT
when employing a suitable condensate pump in basement
and cellar or similar applications.
The boiler condensate trap incorporates a seal of 75mm,
therefore it is unnecessary to install an air break and trap
in the discharge pipework.
1. The condensate outlet will accept 21.5mm (3/4in) plastic
overflow pipe. It is strongly recommended that this
discharges internally into the household drainage system.
Where this is not possible, discharge into an outside drain is
permissible providing every possible precaution is taken to
prevent freezing.
2. Ensure the discharge of condensate complies with any
national or local regulations in force. BS 6798 & Part H1 of
the Building Regulations give further detailed guidance.
3. The discharge pipe should be run in a proprietary drain pipe
material e.g. PVC, PVC-U, ABS, PVC-C or PP.
4. Metal pipework is NOT suitable for use in condensate
discharge systems.
5. The pipe should be a minimum of 21.5mm diameter and
must be supported using suitably spaced clips of the correct
design to prevent sagging.
6. It is advisable that the full length of condensate pipe is run
internally and preferably be less than 3 metres.
7. Internal runs greater than 3 metres or runs in cold areas
should use 32mm waste pipe.
8. External runs MUST be a MINIMUM of 32mm and fully
insulated with material suitable for external use.
9. If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an external
run and sized and insulated accordingly.
10. In all cases discharge pipe must be installed to aid disposal
of the condensate. To reduce the risk of condensate being
trapped, as few bends and fittings as possible should be used
and any burrs on cut pipe removed.
21.5mm
2.5° Minimum fall
i) Termination to an internal soil and
vent pipe
450mm min*
Boiler
2.5° Minimum fall
ii) External termination via internal discharge branch
e.g sink waste - downstream*
Sink
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
50mm per metre of pipe run
50mm per metre of pipe run
*450mm is applicable to
properties up to 3 storeys.
For multi-storey building
installations consult BS 6798.
Examples are shown of the following methods of termination:-
i) to an internal soil & vent pipe
ii) via an internal discharge branch (e.g. sink waste) downstream of the trap
iii) to a drain or gully
iv) to a purpose made soakaway
v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap
vi) pumped into an external soil & vent pipe
vii) to a drain or gully with extended external run & trace heating
It is strongly recommended to discharge internally into the household
drainage system. If connecting to a rain water drain, that drain MUST
discharge into a foul drain.
*It is NOT RECOMMENDED
to connect upstream of the
sink or other waste water
receptacle !
32mm Insulation

17
7.0 Site Requirement
© Baxi Heating UK Ltd 2013
7.7 Condensate Drain (cont.)
11. When discharging condensate into a soil stack or waste
pipe the effects of existing plumbing must be considered. If
soil pipes or waste pipes are subjected to internal pressure
fluctuations when WC's are flushed or sinks emptied then
back-pressure may force water out of the boiler trap and
cause appliance lockout.
Boiler
2.5° Minimum fall
iii) Termination to a drain or gully
Boiler
500mm min
2.5° Minimum fall
iv) Termination to a purpose made soakaway
Holes in the soak-away must
face away from the building
50mm per metre of pipe run
50mm per metre of pipe run
Further specific requirements for soakaway
design are referred to in BS 6798.
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°

18
7.0 Site Requirement
© Baxi Heating UK Ltd 2013
7.7 Condensate Drain (cont.)
12. A boiler discharge pump is available, ‘MULTIFIT’
part no. 720648301. This pump will dispose of both
condensate & high temperature water from the relief valve.
It has a maximum head of 5 metres. Follow the instructions
supplied with the pump.
13. Condensate Drain Pipe ‘Trace Heating’ Elements are
available in various lengths. ‘MULTIFIT’ part nos.:-
1 metre 720644401
2 metre 720664101
3 metre 720664201
5 metre 720664401*
*Where the drain is between 3 & 5 metres a 5 metre kit can
be used and “doubled back” upon itself.
14. It is possible to fit the element externally on the
condensate drain or internally as detailed in the instructions
provided.
15. The fitting of a ‘Trace Heating’ Element is NOT a
substitute for correct installation of the condensate drain.
ALL requirements in this section must still be adhered to.
Boiler
vi) pumped into an external soil & vent pipe
2.5° Minimum fall
50mm per metre of pipe run
Condensate Pump
Unheated Location
(e.g. Garage)
Basement or similar
(heated)
Boiler
2.5° Minimum fall
50mm per metre of pipe run
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
The ‘Trace Heating’ element
must be installed in accordance
with the instructions supplied.
External runs & those in
unheated locations still require
insulation.
vii) to a drain or gully with extended
external run & trace heating
Boiler
v) pumped into an internal discharge branch
(e.g. sink waste) downstream of the trap
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
2.5° Minimum fall
50mm per metre of pipe run
Condensate Pump
Sink
Basement or similar
(heated)

19
7.0 Site Requirements
© Baxi Heating UK Ltd 2013
7.8 Flue
NOTE: Due to the nature of the boiler a plume of water
vapour will be discharged from the flue. This should be
taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements
for siting balanced flue terminals. For GB recommendations
are given in BS 5440 Pt 1. For IE recommendations are given
in the current edition of I.S. 813 “Domestic Gas
Installations”.
2. If the terminal discharges onto a pathway or passageway,
check that combustion products will not cause a nuisance
and that the terminal will not obstruct the passageway.
3. If a terminal is less than 2 metres above a balcony, above
ground or above a flat roof to which people have access,
then a suitable terminal guard must be provided.
IMPORTANT:
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.
*4. Reduction to the boundary is possible down to 25mm
but flue deflector part no. 5111068 must be used.
N
I
I
G
F
M
I
AAF
H
J,K
D
E
H
Likely flue positions requiring
a flue terminal guard
C
RA
I
J,K
I
L
S
B
T
U
Fig. 9
Fig. 8
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
NOTE: The distance from a fanned draught appliance terminal
installed parallel to a boundary may not be less than 300mm in
accordance with the diagram below
Opening Window
or Door
150mm
MIN.
IMPORTANT: If fitting a Plume
Displacement Flue Kit, the air inlet
must be a minimum of 150mm from
any opening windows or doors (see
Section 9.0).
Plume
Displacement Kit
Air Inlet
Fig. 10
Terminal Position with Minimum Distance (Fig. 9) (mm)
A1Directly below an opening, air brick, opening
windows, etc. 300
B1Above an opening, air brick, opening window etc. 300
C1Horizontally to an opening, air brick, opening window etc. 300
D2Below gutters, soil pipes or drain pipes. 25 (75)
E2Below eaves. 25 (200)
F2Below balconies or car port roof. 25 (200)
G2From a vertical drain pipe or soil pipe. 25 (150)
H2From an internal or external corner. 25 (300)
I Above ground, roof or balcony level. 300
J From a surface or boundary line facing a terminal. 600
K From a terminal facing a terminal (Horizontal flue). 1200
From a terminal facing a terminal (Vertical flue). 600
L From an opening in carport (e.g. door, window)
into the dwelling. 1200
M Vertically from a terminal on the same wall. 1500
N Horizontally from a terminal on the same wall. 300
R From adjacent wall to flue (vertical only). 300
S From an adjacent opening window (vertical only). 1000
T Adjacent to windows or openings on pitched and flat roofs 600
U Below windows or openings on pitched roofs 2000
1In addition, the terminal should be no nearer than 150 mm to an opening in the
building fabric formed for the purpose of accommodating a built-in element such as
a window frame.
2Only ONE 25mm clearance is allowed per installation. If one of the dimensions
D, E, F, G or H is 25mm then the remainder MUST be as shown in brackets, in
accordance with B.S.5440-1.
*

20
8.0 Flue Options
© Baxi Heating UK Ltd 2013
Horizontal
Flues
(ii)
(i)
Plume Displacement 60 /100 dia Kit
1M Extensions 45° & 93° elbows
are also available - see Section 9.0
Plume Displacement.
8.1 Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
termination applications.
2. All fittings should be fully engaged. The approximate
engagement is 40mm. Apply soap solution to the seal on
each fitting to aid assembly.
3. Maximum permissible equivalent flue lengths are:-
(60/100)
Horizontal Concentric (15/18 models) 15 metres
(60/100)
Horizontal Concentric (24/28/32 models) 10 metres
(80/125)
Horizontal Concentric (all) 20 metres
4. Any additional “in line” bends in the flue system must be
taken into consideration.
Their equivalent lengths are:-
Concentric Pipes:
135° bend 0.5 metres
93° bend 1.0 metres
Twin Flue Pipe
135° bend 0.25 metres
91.5° bend 0.50 metres
The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point (i) to (ii) as
shown.
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.
(ii)
(i)
This bend is equivalent to
1 metre
Total equivalent length =
A+B+C+2x90°Bends
B
AC
This bend is equivalent to
1 metre
NOTE: Horizontal flue pipes should always be installed with a fall of at least 1.5°
from the terminal to allow condensate to run back to the boiler.