Installation & Servicing Instructions
Megaflo 2 System Compact GA
Range
Gas Fired Wall Mounted Condensing
System Boiler
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2012
Model Range
Baxi Megaflo 2 System 12 Compact GA
G.C.No 41-075-70
Baxi Megaflo 2 System 15 Compact GA
G.C.No 41-075-71
Baxi Megaflo 2 System 18 Compact GA
G.C.No 41-075-72
Baxi Megaflo 2 System 24 Compact GA
G.C.No 41-075-73
Baxi Megaflo 2 System 28 Compact GA
G.C.No 41-075-74
Baxi Megaflo 2 System 32 Compact GA
G.C.No 41-075-75
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 Howitzer Industry Council who manage and promote the Scheme.
Visit www.centralisation.co.UK for more information.
© Baxi Heating UK Ltd 2012 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 Limited,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
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.
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.
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.
0086
ISO 9001
FLEM 00866
2
© Baxi Heating UK Ltd 2012
Installer Notification Guidelines
Choose Building
Regulations Notification
Route
Competent Person's
Self Certification Scheme
Building Control
Install and Commission this
appliance to manufacturer's
instructions
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
Complete the
Benchmark Checklist
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Install and Commission this
appliance to manufacturer's
instructions
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
Complete the
Benchmark Checklist
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
© Baxi Heating UK Ltd 2012
LABC will record the data
and will issue a
certificate of compliance
3
Legislation
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 declares 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 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.gasgaferegister.co.uk
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 No 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:-
Codes of Practice - refer to the most recent version
Type test for purpose of Regulation 5 certified by:
Notified Body 0085.
Product/Production certified by:
Notified Bodies 0085 & 0086.
For GB/IE only.
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 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.
BS EN 12828
Heating systems in buildings - Design for
water-based heating systems
BS EN 12831
Heating systems in buildings - Method for
calculation of the design heat load
BS EN 14336
Heating systems in buildings - Installation and
commissioning of water-based 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 7074
BS 7593
BS EN 12828
BS EN 12831
BS EN 14336
4
© Baxi Heating UK Ltd 2012
Expansion vessels and ancillary equipment for
sealed water systems.
Treatment of water in domestic hot water
central heating systems.
Heating systems in buildings - Design for
water-based heating systems
Heating systems in buildings - Method for
calculation of the design heat load
Heating systems in buildings - Installation and
commissioning of water-based heating systems
Safe Manual Handling
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 !!
© Baxi Heating UK Ltd 2012
5
CONTENTS
Section
6
© Baxi Heating UK Ltd 2012
Page
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
20
9.0
Installation
22
10.0
Commissioning
27
11.0
Completion & System Draining
29
12.0
Servicing
30
13.0
Changing Components
32
14.0
Combustion & Calibration
39
15.0
Electrical
40
16.0
Short Parts List
41
17.0
Fault Finding
42
18.0
32 kW Model Supplement
47
Benchmark Checklist
50
The 12 to 28 kW models in the Baxi Megaflo 2
System Compact GA Range are of the same
dimensions and layout. The 32 kW model differs
in several respects - these are detailed in
Section 18.0 ‘32 kW Model Supplement’
1.0 Introduction
1.1
Description
1. The Baxi Megaflo 2 System Compact GA Range are fully
automatic gas fired wall mounted condensing system boilers.
They are room sealed and fan assisted.
2. The boiler is set to give a maximum output of :12 models - 12 kW
12.7 kW (Condensing)
15 models - 15 kW
15.9 kW (Condensing)
18 models - 18 kW
19 kW (Condensing)
24 models - 24 kW
25.4 kW (Condensing)
28 models - 28 kW
29.6 kW (Condensing)
32 models - 32 kW
33.8 kW (Condensing)
Information Label
3. The boiler is factory set for use on Natural Gas (G20). It can
be adapted to operate on Propane (G31) - see Section 10.1
‘Gas Type Check’.
4. The boiler incorporates a circulating pump and expansion
vessel. It is suitable for use only on fully pumped sealed
systems.
Fig. 1
Control Flap
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. 2).
6. The boiler model name and serial number are also shown
on the information label behind the boiler control flap (Fig. 1).
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 one of the standard horizontal
telescopic flue kits detailed in the Flue Installation Guide.
9. All systems must be thoroughly flushed and treated with
inhibitor (see section 6.1).
1.2
Gas Type Label
Data Badge
Fig. 2
Various timers, external controls, etc. are available as optional
extras. Full details are contained in the relevant sales
literature.
1.3
NOTE: These Installation & Servicing Instructions MUST be
read in conjunction with the Flue Installation Guide
supplied in the Literature Pack.
© Baxi Heating UK Ltd 2012
Optional Extras
Contents of Pack
The pack contains:• Boiler
• Wall Plate (including taps)
• Template
• Literature Pack
7
2.0 General Layout
2.1
Layout 12 - 28 Models
3
4
2
1
11
10
1.
Expansion Vessel
2.
Expansion Vessel Locating Stud
3.
Boiler Adaptor
4.
Primary Heat Exchanger
5.
Pump with Automatic Air Vent
6.
Central Heating System Pressure Gauge
7.
Fan Assembly
8.
Flame Sensing Electrode
9.
Air/Gas Collector
10.
Spark Ignition Electrode
9
11.
Combustion Box Cover & Burner
8
12.
Condensate Trap
13.
Safety Pressure Relief Valve
14.
Boiler Control
15.
Gas Valve
16.
Boiler Drain Tap
17.
Control Box Display
18.
Heating Flow Sensor
19.
Safety Thermostat
7
12
13
14
17
15
18
5
19
6
16
8
© Baxi Heating UK Ltd 2012
13
3.0 Appliance Operation
3.1
14
12
Operating Mode
1. With a demand for heating, the pump circulates water
through the primary circuit.
15
2. Once main burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
temperature sensor.
16
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.
17
18
4. When the demand is satisfied the burner is extinguished
and the pump continues to run for a period of 3 minutes
(Pump Overrun).
19
20
3.2
21
11
10
Boiler Frost Protection Mode
1. The frost protection mode is integral to the appliance and
functions as long as there is power to the boiler, as indicated
by the standby signal
.
22
2. When the boiler temperature falls below 5°C the boiler
will fire until a temperature of 30°C is reached.
9
3. Further protection can be incorporated by using a system
frost thermostat.
1
3.3
1. If the boiler has been inactive for a period of 24 hours the
pump will automatically operate for 1 minute to prevent
sticking.
7
8
2
5
A
6
Pump Protection
3
4
B
C
D
Fig. 3
Key
1. Pump with Automatic Air Vent
2. CH System Pressure Gauge
3. Central Heating Filter
4. Non-return valve
5. Hydraulic Pressure Sensor
6. Boiler Drain Tap
7. Pressure Relief Valve
8. Condensate Trap
9. Gas Valve
10. Safety Thermostat (105°C)
11. Heating Flow Sensor
12. Flue Sensor
13. Boiler Adaptor
14. Primary Heat Exchanger
15. Spark Ignition Electrode
16. Burner
17. Flame Sensing Electrode
18. Air/Gas Collector
19. Heating Return Sensor
20. Fan
21. Air-Gas Venturi
22. Expansion Vessel
Connections:A – Condensate Drain
B – Heating Flow
C – Gas Inlet
D – Heating Return
© Baxi Heating UK Ltd 2012
9
4.0 Technical Data
4.1
Appliance Category
CAT I 2H 3P
Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Heat Input CH (Net)
12 model
kW
15 model
kW
18 model
kW
24 model
kW
28 model
kW
Max
12
15
18
24
28
Power Consumption
12 model
W
15 model
W
18 model
W
24 model
W
28 model
W
C13 C33 C43 C53
Min
2.1
2.2
2.6
3.5
4.1
Min
2
2.1
2.5
3.4
4
Heat Output CH (Condensing)
Max
12 model
kW
12.7
15 model
kW
15.9
18 model
kW
19
24 model
kW
25.4
28 model
kW
29.6
Min
2.2
2.3
2.8
3.7
4.3
mm
mm
mm
mm
mm
3
3.3
3.6
4.6
4.9
NATURAL GAS ONLY !
Max Gas Rate
12 model
15 model
18 model
24 model
28 model
(Natural Gas - G20)
(After 10 mins)
m3/h
1.27
m3/h
1.59
1.90
m3/h
m3/h
2.54
m3/h
2.96
Inlet Pressure (Natural Gas - G20)
mbar
20
PROPANE ONLY !
Max Gas Rate
12 model
15 model
18 model
24 model
28 model
(Propane - G31)
(After 10 mins)
kg/h
0.93
kg/h
1.17
kg/h
1.4
kg/h
1.86
kg/h
2.18
Inlet Pressure (Propane - G31)
mbar
37
NOTE: All data in this section are nominal values
and subject to normal production tolerances.
Packaged Boiler Carton
Installation Lift Weight
(12/15/18/24)
36.5kg
32.5kg
(28 model)
38.5kg
34.5kg
NOx Class
5
Packaged Boiler Carton
Installation Lift Weight
110
108
125
104
135
N.G. 9.0% ± 0.7
L.P.G. 10.5% ± 1.0
CO2
Electrical Protection
Heat Output CH (Non-Condensing)
Max
12 model
kW
12
15 model
kW
15
18 model
kW
18
24 model
kW
24
28 model
kW
28
Injector
12 model
15 model
18 model
24 model
28 model
Weights
IPX5D
External Fuse Rating
3A
Internal Fuse Rating
F2L
Central Heating Primary Circuit
Pressures
Condensate Drain
To accept 21.5mm (3/4 in) plastic waste pipe
Flue Terminal
Dimensions
Diameter
Projection
Connections
Gas Inlet
Heating Flow
Heating Return
Pressure Relief Discharge
Clearances
Above Casing
Below Casing
Front
Front
L.H. Side
R.H. Side
-
100mm
125mm
Pump
Available Head
copper tails
22mm
22mm
22mm
15mm
(12, 15, 18, 24 & 28)
litre
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
-
See graph below
Expansion Vessel
- (For Central Heating only.
Integral with appliance)
bar
Min Pre-charge Pressure
0.5
175 mm Min
150mm Min*
450mm Min (For Servicing)
5mm Min (In Operation)
5mm Min
5mm Min
Outercase Dimensions
Casing Height
Overall Height Inc Flue Elbow
Casing Width
Casing Depth
Max Capacity of
CH System
100
Primary Water Content
of Boiler (unpressurised)
2.5
Temperatures
C.H. Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
700mm
860mm
390mm
300*mm
*This can be reduced to 290mm by removing the
boiler control access flap
Pump - Available Head
SEDBUK Declaration
6
SAP 2005 Seasonal Efficiency for N. G.
models is 91.1%
SAP 2005 Seasonal Efficiency for L.P.G.
models is 93.2%
SAP 2009 Annual Efficiency for N. G.
models is 89%
SAP 2009 Annual Efficiency for L.P.G.
models is 91%
This value is used in the UK Government’s Standard
Assessment Procedure (SAP) for energy rating of
5.5
5
4.5
4
3.5
3
2.5
2
dwellings. The test data from which it has been calculated
1.5
has been certified by 0087.
1
0.5
0
0
200
400
600
Flow Rate (l/h)
10
© Baxi Heating UK Ltd 2012
bar
3
2.5
0.5
1-2
Safety Discharge
Max Operating
Min Operating
Recommended Operating Range
Metre (wg)
Appliance Type
(See Section 18.0 for 32 kW model)
800
1000
1200
5.0 Dimensions and Fixings
Dimensions
At least 1.5°
G
E
A 700mm
B 300*mm
*This can be reduced to 290mm by
removing the boiler control access flap
A
C 390mm
D 116mm Ø Min.
E 160mm
(207mm for 80/125mm
flue systems)
B
F 130mm
360° Orientation
G 106mm
H
D
C
H 228mm
J
J
162mm
Flue Ø 100mm
F
Tap Rail
Boiler
Side
Boiler
Side
Condensate
Drain
40 mm
Pressure
Relief
Valve
(15mm)
25
mm
130 mm
130 mm
65 mm
162.5 mm
Heating
Flow
(22mm)
© Baxi Heating UK Ltd 2012
Gas
Inlet
(22mm)
Heating
Return
(22mm)
11
6.0 System Details
6.1
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. Some
systems may require an additional external bypass.
6.3
System Control
1. Further external controls (e.g. room thermostat sensors)
MUST be fitted to optimise the economical operation of the
boiler in accordance with Part L of the Building Regulations
(2010). A range of optional controls are available. Full details
are contained in the relevant Sales Literature.
12
© Baxi Heating UK Ltd 2012
6.0 System Details
6.4
Stop
Valve
Double
Check
Valve
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.
Stop
Valve
Fig. 4
DHW
Mains
Inlet
Temporary
Loop
System Filling and Pressurising
CH
Return
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.
6.5
Fig. 5
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 100 litres (32 kW model - 155 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. 6)
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 (Fig. 6a).
The end of the pipe should
terminate facing down and
towards the wall
Fig. 6a
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.
Control Box removed
for clarity
Fig. 6
Pressure Relief Valve
Discharge Pipe
© Baxi Heating UK Ltd 2012
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).
5. A boiler discharge pump is available, 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.
13
390mm
5mm Min
7.0 Site Requirements
5mm Min
7.1
175mm Min
(300mm Min if
using 80/125mm
flueing system)
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. Where the boiler is sited in an unheated enclosure and
during periods when the heating system is to be unused it is
recommended that the permanent live is left on to give
BOILER frost protection. NOTE: THIS WILL NOT PROTECT
THE SYSTEM !
700mm
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).
Fig. 8
150mm* Min
7.2
Clearances (Figs. 8 & 9)
1. A flat vertical area is required for the installation of the
boiler.
At least 1.5°
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 MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
7.3
450mm Min
Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required.
For Servicing
Purposes
2. BS 5440: Part 2 refers to room sealed appliances installed
in compartments. The appliance will run sufficiently cool
without ventilation.
5mm Min
300mm
In Operation
(290mm with flap removed)
Fig. 9
14
© Baxi Heating UK Ltd 2012
7.0 Site Requirement
7.4
Gas Supply
1. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891 (NG) or BS 5482
Pt. 1 (LPG). 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. 10).
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).
Gas Service Cock
7.5
Electrical Supply
Fig. 10
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.
Zone 2
2. The mains supply is 230V ~ 50Hz fused at 3A.
Window
Recess
NOTE: The method of connection to the electricity
supply must facilitate complete electrical isolation of the
appliance.
Zone 1
Zone 2
Zone 0
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.
0.6 m
Window
Recess
Zone 2
7.6
Fig. A
In GB Only
Ceiling
Window Recess
Zone 2
Zone 1
Zone 2
Outside Zones
Bath & Shower Rooms
1. If the boiler is fitted in a room containing a bath or
shower 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.
2.25 m
Zone 0
0.6 m
Fig. B
© Baxi Heating UK Ltd 2012
In GB Only
15
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.
Insulation
32mm
21.5mm
7.0 Site Requirements
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.
i) Termination to an internal soil and
vent pipe
50mm
per me
2.5° M
tre of
inimum
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.
pipe ru
n
fall
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.
450mm min*
*450mm is applicable to
properties up to 3 storeys.
For multi-storey building
installations consult BS 6798.
ii) External termination via internal discharge branch
e.g sink waste - downstream*
Boiler
The boiler condensate trap incorporates a seal of 75mm,
therefore it is unnecessary to install an air break and trap
in the discharge pipework.
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.
Sink
50mm
per me
2.5° M
tre of
inimum
fall
pipe ru
n
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
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.
*It is NOT RECOMMENDED
to connect upstream of the
sink or other waste water
receptacle !
16
© Baxi Heating UK Ltd 2012
7.0 Site Requirement
7.7
iii) Termination to a drain or gully
Boiler
50mm
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
per me
tre of
2.5° M
inimum
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.
pipe ru
n
fall
iv) Termination to a purpose made soakaway
Further specific requirements for soakaway
design are referred to in BS 6798.
Boiler
500mm min
50mm p
er metr
e of pip
2.5° Min
e run
imum fa
© Baxi Heating UK Ltd 2012
ll
Holes in the soak-away must
face away from the building
17
v) pumped into an internal discharge branch
(e.g. sink waste) downstream of the trap
Sink
50mm
7.0 Site Requirement
per me
tre of p
ipe run
2.5° M
inimum
fall
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
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.:-
Basement or similar
(heated)
1 metre 720644401
2 metre 720664101
3 metre 720664201
5 metre 720664401*
Boiler
*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.
Condensate Pump
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.
vi) pumped into an external soil & vent pipe
50mm
Unheated Location
(e.g. Garage)
per me
tre of p
ipe run
2.5° M
inimum
fall
Basement or similar
(heated)
vii) to a drain or gully with extended
external run & trace heating
Boiler
The ‘Trace Heating’ element
must be installed in accordance
with the instructions supplied.
External runs & those in
unheated locations still require
insulation.
Boiler
Condensate Pump
50mm
per me
tre of
2.5° M
inimum
18
© Baxi Heating UK Ltd 2012
pipe ru
n
fall
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
Terminal Position with Minimum Distance (Fig. 12)
(mm)
A1 Directly below an opening, air brick, opening
windows, etc.
B1 Above an opening, air brick, opening window etc.
C1 Horizontally to an opening, air brick, opening window etc.
D2 Below gutters, soil pipes or drain pipes.
E2 Below eaves.
F2 Below balconies or car port roof.
G2 From a vertical drain pipe or soil pipe.
H2 From an internal or external corner.
I
Above ground, roof or balcony level.
J
From a surface or boundary line facing a terminal.
K From a terminal facing a terminal (Horizontal flue).
From a terminal facing a terminal (Vertical flue).
L From an opening in carport (e.g. door, window)
into the dwelling.
M Vertically from a terminal on the same wall.
N Horizontally from a terminal on the same wall.
R From adjacent wall to flue (vertical only).
S From an adjacent opening window (vertical only).
T Adjacent to windows or openings on pitched and flat roofs
U Below windows or openings on pitched roofs
7.0 Site Requirements
300
300
300
25 (75)
25 (200)
25 (200)
25 (150)
25 (300)
300
600
1200
600
7.8
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”.
1200
1500
300
300
1000
600
2000
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.
1 In addition, the terminal should be no nearer than 150 mm to an opening in the
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.
building fabric formed for the purpose of accommodating a built-in element such as
a window frame.
2 Only ONE 25mm clearance is allowed per installation. If one of the dimensions
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.
D, E, F, G or H is 25mm then the remainder MUST be as shown in brackets, in
accordance with B.S.5440-1.
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
300 min
Terminal
Assembly
Flue
*4. Reduction to the boundary is possible down to 25mm
but flue deflector part no. 5111068 must be used.
*
Plume
Displacement Kit
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).
Top View Rear Flue
Fig. 11
Property Boundary Line
J,K
Air Inlet
T
U
Opening Window
or Door
150mm
MIN.
N
R
I
M
C
I
I
F
D
E
A
S
I
F
J,K
B
L
G
A
A
H
Fig. 13
H
I
Likely flue positions requiring
a flue terminal guard
© Baxi Heating UK Ltd 2012
Fig. 12
19
8.0 Flue
8.1
Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
termination applications.
(ii)
(i)
2. All fittings should be fully engaged. The approximate
engagement is 40mm. Apply the lubricant supplied to the
seal on each fitting to aid assembly.
3. Maximum permissible equivalent flue lengths are:(60/100)
(80/125)
Horizontal Concentric 10 metres
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
5. The elbow supplied with the standard horizontal
telescopic flue kit is not included in any equivalent length
calculations.
Plume Displacement Kit 60 /100 dia
1M Extensions 45° & 93° elbows
are also available.
NOTE: Flue length is measured from point (i) to (ii) as
shown.
Horizontal
Flues
IMPORTANT
SUPPORT - All flue systems MUST be securely
supported a MINIMUM of once every metre. It is
recommended that every straight piece is supported
irrespective of length. Additional supports are available
as accessories.
VOIDS - Consideration must be given to flue systems
in voids and the provision of adequate access for
subsequent periodic visual inspection.
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.
This bend is equivalent to
1 metre
C
A
(ii)
B
(i)
This bend is equivalent to
1 metre
Total equivalent length =
A+B+C+2 x 90° Bends
20
© Baxi Heating UK Ltd 2012
6. Read this section in conjunction with the Flue Installation
Guide supplied with the boiler.
8.0 Flue
8.2
Flue Lengths
The standard horizontal telescopic flue kit allows for lengths
between 315mm and 500mm from elbow to terminal (Fig. 14).
Extensions of 250mm, 500mm & 1m are available.
m
The maximum permissible equivalent flue length is:
10 metres (60/100 system - vertical & horizontal)
20 metres (80/125 system - vertical & horizontal)
15 metres (80/80 twin pipe)
8 metres (60/100 system - vertical connected to
ridge terminal)
0m
50
m
5m
31
Flue Deflector
Fig. 14
For details of Plume Displacement Kit lengths see the Flue
Installation Guide supplied in the literature pack.
8.3
Flue Trim
1. The flexible flue trims supplied can be fitted on the outer and
inner faces of the wall of installation.
Fig. 16
8.4
Terminal Guard (Fig. 15)
1. When codes of practice dictate the use of terminal guards,
‘Multifit’ accessory part no. 720627901 can be used (Note: This
is not compatible with Flue Deflector referred to below).
2. If a proprietary guard is used it must be identified as suitable
for use with condensing boilers.
Fig. 15
3. There must be a clearance of at least 50mm between any part
of the terminal and the guard.
4. The flue terminal guard should be positioned centrally over the
terminal and fixed as illustrated.
8.5
Flue Deflector (Fig. 16)
1. If required, push the flue deflector over the terminal end and
rotate to the optimum angle for deflecting plume. Secure the
deflector to the terminal with screws provided.
8.6
Flue Accessories
1. For full details of Flue Accessories (elbows, extensions, clamps
etc.) refer to the Flue Installation Guide supplied in the literature
pack.
© Baxi Heating UK Ltd 2012
21
9.0 Installation
9.1
Unpacking & Initial Preparation
IMPORTANT
RISK ASSESSMENT - Before commencing the installation
it is recommended that the ‘Five Steps to Risk
Assessment’ document published by the HSE is consulted,
and an assessment performed as described.
GAS SUPPLY - The gas supply, gas type and pressure
must be checked for suitability before connection (see
Section 7.4).
NOTE: a small amount of water may drain from the boiler
in the upright position. If pre-plumbing it will be necessary
to turn the carton over to access the wall plate first.
1. Remove staples, open flaps and remove the cardboard
sheet. Remove the polystyrene side pieces and literature. Two
people can then lift out the boiler (Fig. 17).
Fig. 17
2. After considering the site requirements
(see Section 7.0) position the fixing template on the wall
ensuring it is level both horizontally and vertically.
116mm Dia Minimum
Aperture For Flue Tube
130mm
Side Flue
Centre Line
175mm
Minimum
Clearance
3. Mark the position of the two most suitable fixing slots for
the wall plate and boiler lower fixing holes.
4. Mark the position of the centre of the flue hole (rear exit).
For side flue exit, mark as shown (Fig. 18).
Vertical Flue
Centre Line
228 mm
Boiler Mounting Bracket
Fixing Slots
50 mm
5. If required, mark the position of the gas and water pipes.
Remove the template.
For Side Flue Exit
6. Cut the hole for the flue (minimum diameter 116mm).
Fig. 18
8mm Dia
8mm Dia
7. Drill the wall as previously marked to accept the wall plugs
supplied. Secure the wall plate using the fixing screws.
Profile of
Outercase
5 mm Minimum
Side Clearance
8. Using a spirit level ensure that the plate is level before finally
tightening the screws.
5 mm Minimum
Side Clearance
9. Connect the gas and water pipes to the valves on the wall
plate using the copper tails supplied. Ensure that the sealing
washers are fitted between the connections.
10. Fit the filling loop as described in the instructions supplied
with it.
Condensate
Drain
Pressure
Relief
Valve
(15mm)
25
40 mm mm
200mm
Recommended
150mm
Minimum
Clearance
130 mm
130 mm
65 mm
162.5 mm
Heating
Flow
(22mm)
Gas
Inlet
(22mm)
9.2
Flushing
Heating
Return
(22mm)
1. Connect a tube to the heating flow or return pipe (Fig. 20).
Fig. 19
Flushing Tube
Heating Flow
Fig. 20
22
© Baxi Heating UK Ltd 2007
Heating Return
2. Make the flow and return connections to the isolation taps.
Flush the system thoroughly to remove all impurities (see
System Details, Section 6.1).
Boiler Mounting
Bracket
9.0 Installation
9.3
Fitting The Boiler
1. Remove the sealing caps from the boiler connections.
NOTE: A small amount of water may drain from the
boiler once the caps are removed.
Sealing Washers
2. Lift the boiler as indicated by the shaded areas. The boiler
should be lifted by TWO PEOPLE. Engage the mounting
bracket at the top rear of the boiler on the wall plate (Fig.21)
(see Safe Manual Handling page 5).
3. Insert the sealing washers between the valves and pipes
on the wall plate and the boiler connections.
4. Tighten all the connections.
Fig. 21
Suggested Lifting Points
shown as shaded area
9.4
Remove Sealing Caps from
under the Boiler after lifting
into position
Fitting the Pressure Relief Discharge Pipe
(Fig. 22)
1. Remove the discharge pipe from the kit.
2. Determine the routing of the discharge pipe in the vicinity
of the boiler. Make up as much of the pipework as is
practical, including the discharge pipe supplied.
Prime Trap by pouring
300ml of water into
flue spigot
IMPORTANT: Make all soldered joints before connecting
to the pressure relief valve. The relief valve is intentionally
angled to the right of the boiler. DO NOT adjust the
position of the valve. The discharge pipe must be installed
before pressurising the system.
3. The pipework must be at least 15mm diameter and run
continuously downwards to a discharge point outside the
building. See section 6.6 for further details.
Pressure Relief Valve
4. Utilising one of the sealing washers, connect the discharge
pipe to the adaptor and tighten the nut hand tight, plus 1/4
turn to seal.
5. Complete the discharge pipework and route it to the
outside discharge point.
9.5
Fig. 22
Discharge Pipe
Condensate Drain (see section 7.7) (Fig. 23)
1. Using the short piece of rubber hose supplied, connect the
condensate drain pipework to the boiler condensate trap
outlet pipe. When connecting the hose, ensure that the
condensate sump is not inadvertantly unscrewed.
Control Box removed
for clarity
Ensure the discharge of condensate complies with any
national or local regulations in force (see British Gas
“Guidance Notes for the Installation of Domestic Gas
Condensing Boilers” & HHIC recommendations).
2. The hose will accept 21.5mm (3/4in) plastic overflow pipe
which should generally discharge internally into the
household drainage system. If this is not possible, discharge
into an outside drain is acceptable.
Condensate Trap
Outlet Pipe
Fig. 23
© Baxi Heating UK Ltd 2012
3. The boiler condensate trap should be primed by pouring
approximately 300ml of water into the flue spigot. Do not
allow any water to fall into the air inlet.
23
9.0 Installation
m
0m
50
m
5m
31
9.6
Fitting The Flue
HORIZONTAL TELESCOPIC FLUE
Terminal Assembly
Connection Assembly
Fig. 24
1. There are two telescopic sections, the Terminal
Assembly and the Connection Assembly, a roll of sealing
tape and two self tapping screws. A 93° elbow is also
supplied. The outer duct of the Connection Assembly is
painted white. On the Terminal Assembly the outer duct is
unpainted.
2. The two sections can be adjusted to provide a length
between 315mm and 500mm (Fig. 24) when measured
from the flue elbow (there is 50mm engagement into the
elbow).
Wall Thickness
3. Locate the flue elbow on the adaptor at the top of the
boiler. Set the elbow to the required orientation (Fig. 25).
(X)
NOTE: The flue elbow is angled at 93 degrees to
ensure a fall back to the boiler.
4. Measure the distance from the outside wall face to the
elbow. This dimension will be known as ‘X’ (Fig. 25).
5. If the distance from the flue elbow to the outside face of
the wall (‘X’ in Fig. 25) is less than 250mm the Connection
Assembly can be discarded and the Terminal Assembly
fitted directly into the elbow.
(X)
Wall
Thickness
Fig. 25
6. In instances where the dimension ‘X’ (Fig. 25) is between
250mm and 315mm it will be necessary to shorten the
Terminal Assembly by careful cutting to accommodate
walls of these thicknesses.
7. To dimension ‘X’ add 50mm. This dimension to be
known as ‘Y’.
‘Peak’ to be uppermost
8. Adjust the two telescopic sections to dimension ‘Y’ and
seal the joint with the tape provided (Fig. 27). Ensure that
the labels marked ‘TOP’ on the Terminal and Connection
Assemblies are uppermost.
Fig. 26
9. Using the clearance holes in the Connection Assembly
secure it to the Terminal Assembly using the screws
supplied (Fig. 28).
‘TOP’ Label
’
n ‘Y
io
ens
Dim
Securing Screw
Sealing Tape
Fig. 27
‘TOP’ Label
24
© Baxi Heating UK Ltd 2012
Fig. 28
9.0 Installation
Flue Elbow
Apply the lubricant
supplied for ease of
assembly (do not use
any other type).
9.6
Ensure Flue Elbow is
fully engaged into
Boiler Adaptor
Fitting the Flue (Cont)
10. Remove the flue elbow and insert the flue through the
hole in the wall. Fit the flue trims if required, and refit the
elbow to the boiler adaptor, ensuring that it is pushed fully
in (Fig. 29).
Boiler
Adaptor
11. Draw the flue back through the wall and engage it in
the elbow. It may be necessary to lubricate to ease
assembly of the elbow and flue (Fig. 30).
Fig. 29
12. Ensure that the terminal is positioned with the slots to
the bottom (Fig. 31). Secure the flue to the elbow with the
screws supplied (Fig. 30).
Apply the lubricant
supplied for ease of
assembly (do not use
any other type).
IMPORTANT: It is essential that the flue terminal is fitted
as shown to ensure correct boiler operation and prevent
water entering the flue.
Ensure Flue is fully
engaged into Elbow
13. Make good between the wall and air duct outside the
building, appropriate to the wall construction and fire rating.
14. If necessary fit a terminal guard (see Section 8.4).
Fig. 30
Slots at bottom
© Baxi Heating UK Ltd 2012
Fig. 31
25
9.0 Installation
9.7
Making The Electrical Connections
1. See Section 7.5 for details of the electrical supply. Undo
the securing screws and lift the case front panel off.
2. Disengage the securing tab and hinge the control box
downwards. Undo the terminal block cover securing screw
and remove the cover (Fig. 32).
3. Slacken the gland nut in the left of the boiler lower panel
and pass the mains cable through it. Remove the grommet
adjacent to the gland nut, pierce the diaphragm and insert
the cable from the external control system.
Control Box
4. Leave sufficient slack in the cables to allow the Control
Box to be hinged fully open. Tighten the gland nut and refit
the grommet.
5. Connect the Earth, Permanent Live and Neutral wires to
the terminal strip.
Fig. 32
NOTE: Both the Permanent Live and Neutral
connections are fused.
6. Refer to the instructions supplied with the external
control(s).
IMPORTANT: The room thermostat MUST be suitable
for 230V switching.
Always fit fast
blow 2A fuse
Fused supply 3A
230V ~ 50Hz
230V
1
b
2
bk
Earth (green/yellow)
g/y
Neutral (blue)
b
Live (brown)
br
Terminal Block
Fig. 33
26
© Baxi Heating UK Ltd 2012
7. Remove the link between terminals 1 & 2. The switched
output from the external control must be connected to
terminal 1. (Fig. 33).
8. Replace the terminal block cover.
9.8
Preliminary Electrical Checks
1. Prior to commissioning the boiler preliminary electrical
system checks should be carried out.
Fuses
2. These should be performed using a suitable meter, and
include checks for Earth Continuity,
Resistance to Earth, Short Circuit and Polarity.
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