Baxi Megaflo System 24 HE IE LPG Technical data

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Installation & Servicing Instructions
Baxi Megaflo System HE IE Range
Gas Fired Wall Mounted Condensing Boiler
These instructions include the Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2011
Supplied by HeatingSpares247.com
Natural Gas
Baxi Megaflo System 15 HE IE
Baxi Megaflo System 18 HE IE
Baxi Megaflo System 24 HE IE
Baxi Megaflo System 28 HE IE
Baxi Megaflo System 32 HE IE
Propane Gas
Baxi Megaflo System 24 HE IE LPG
Baxi Megaflo System 28 HE IE LPG
© Baxi Heating UK Ltd 2011 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.
0086
ISO 9001
FM 00866
2
© Baxi Heating UK Ltd 2011
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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.
The installation 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.
Warning - Check the information on the data plate is compatible with local supply
conditions.
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:Type test for purpose of Regulation 5 certified by:
Notified Body 0085.
Product/Production certified by:
Notified Bodies 0085 & 0086.
For IE only.
© Baxi Heating UK Ltd 2011
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 IE and should
be installed in accordance with the rules in force, and only
used in a suitably ventilated location.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
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).
Codes of Practice - refer to the most recent version
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.
3
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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 !!
4
© Baxi Heating UK Ltd 2011
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CONTENTS
Section
© Baxi Heating UK Ltd 2011
Page
1.0
Introduction
6
2.0
General Layout
7
3.0
Appliance Operation
8
4.0
Technical Data
9
5.0
Dimensions and Fixings
11
6.0
System Details
12
7.0
Site Requirements
14
8.0
Flue Options
18
9.0
Plume Displacement
23
10.0
Installation
27
11.0
Commissioning
32
12.0
Completion
34
13.0
Servicing
35
14.0
Changing Components
37
15.0
Setting the Gas Valve
45
16.0
Electrical
46
17.0
Short Parts List
47
18.0
Fault Finding
48
Commissioning Checklist
54
5
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1.0 Introduction
1.1
Description
1. The Baxi Megaflo System HE IE is a fully automatic gas fired
wall mounted condensing system boiler. It is room sealed and
fan assisted.
Case Front Panel
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 either Natural Gas (G20), or
Propane (G31) as indicated by the suffix LPG in the model
name. Two Propane models are available, the Baxi Megaflo
System 24 HE IE LPG & 28 HE IE LPG
4. The boiler incorporates a circulating pump and expansion
vessel. It is suitable for use only on fully pumped sealed
systems.
Control Box
Fig. 1
5. The boiler data badge gives details of the model and serial
number, and is situated on the inner door panel. It is visible
when the case front panel is removed (Fig. 1).
Data Badge
Information Label
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).
1.2
Contents of Pack
The pack contains:• Boiler
• Wall Plate (including taps)
• Set of Pipe Connections
• Template & ‘Quick Fit’ Guide
• Literature Pack
6
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2.0 General Layout
2.1
Layout
22
1
14
21
13
12
20
15
19
6
9
8
7
11
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
2
10
4
3
5
24
2
1
3
4
0
bar
16
© Baxi Heating UK Ltd 2011
25
23
17
18
7
7
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3.0 Appliance Operation
3.1
Operating Mode (Fig. 2)
Boiler Primary Circuit
1. With a demand for heating or hot water, the pump
circulates water through the primary circuit. If the pressure is
at least 0.2 bar the ignition sequence will start.
1
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.
2
20
18
3
3. When the demand is satisfied the burner is extinguished
and the pump continues to run for a period of 3 minutes
(Pump Overrun).
4
19
5
7
6
17
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
16
9
15
8
14
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
11
Key
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
8
10
12
Fig. 2
Heat Exchanger
Burner
Ignition Electrode
Flame Sensing Electrode
Gas Valve
Pump
Automatic Air Vent
Pressure Relief Valve
Boiler Drain Point
Gas Inlet
Boiler Flow
Boiler Return
Pressure Gauge
Automatic By-Pass
Water Pressure Sensor
Safety Thermostat
Temperature Sensor
Expansion Vessel
Return Temperature Sensor
Fan
© Baxi Heating UK Ltd 2011
Frost Protection Mode
13
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.
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4.0 Technical Data
4.1
Appliance Type
C13
Appliance Category
C33
C53
CAT I 2H
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
Inlet Pressure (Natural Gas - G20)
mbar
20
NOx Class
Power Consumption
15 model
18 model
24 model
28 & 32 models
Max
Min
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
Condensate Drain
To accept 21.5mm (3/4 in) plastic waste pipe
Heat Output (Non-Condensing)
Max
Min
Flue Terminal
Dimensions
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
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
m /h
3.48
3
Electrical Protection
IPX5D
External Fuse Rating
3A
Pump
Available Head
Internal Fuse Rating
F2L
Expansion Vessel
Diameter
Projection
Connections
Gas Supply
Central Heating Flow
Central Heating Return
Pressure Relief Discharge
-
Clearances
Above Casing
Below Casing
Front
Front
L.H. Side
R.H. Side
Max Capacity of
CH System
125
Primary Water Content
of Boiler (unpressurised)
2.5
Temperatures
Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
780mm
965mm
450mm
345mm
Weights
200 mm Min
150 mm Min*
450 mm Min (For Servicing)
5 mm Min (In Operation)
5 mm Min
5 mm Min (In Operation)
Packaged Boiler Carton
Installation Lift Weight
15 & 18
52.5kg
43kg
Packaged Boiler Carton
Installation Lift Weight
28 & 32
54.5kg
45kg
24
53.5kg
44kg
*This is the MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
Pump - Available Head
5.5
Injector (Natural Gas - G20)
4.5mm
5
18 model
5.7mm
4.5
24 model
7.5mm
4
28 model
12mm
3.5
32 model
12mm
3
Metre (wg)
15 model
litre
copper tails
3/4”
3/4”
3/4”
1/2”
-
See graph below
- (Integral with appliance)
bar
Min Pre-charge Pressure
0.5
100mm
125mm
Outercase Dimensions
Casing Height
Overall Height Inc Flue Elbow
Casing Width
Casing Depth
bar
3
2.5
0.5
1-2
For ‘Semi-Sealed’ Systems it is recommended that
the system is designed to achieve a pressure of
0.2 bar at the boiler (see Section 6.4).
kW
Min
Safety Discharge
Max Operating
Min Operating
Recommended Operating Range
130W
140W
150W
160W
15 model
Max
5
Central Heating Primary Circuit
Pressures (Sealed Systems)
Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Heat Input (Gross)
Heat Output (Condensing)
Megaflo System 15, 18, 24, 28 & 32 HE IE
2.5
2
1.5
1
0.5
0
0
200
400
600
800
1000
1200
Flow Rate (l/h)
© Baxi Heating UK Ltd 2011
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4.0 Technical Data
4.2
Appliance Type
C13
C33
C53
Appliance Category
CAT I I 2H3P
Power Consumption
24 LPG model
28 LPG model
Heat Input (Net)
Electrical Protection
Max
Min
24 LPG model
kW
24.7
7
28 LPG model
kW
28.9
9.7
Heat Input (Gross)
Max
Min
24 LPG model
kW
27.4
7.8
28 LPG model
kW
32.1
10.8
Heat Output (Non-Condensing)
Max
Min
24 LPG model
kW
24
6.8
28 LPG model
kW
28
9.4
Max
Min
kW
25.9
7.4
28 LPG model
kW
30.3
10.2
Max Gas Rate
(Propane Gas - G31)
(After 10 mins)
24 LPG model
kg/h
1.92
28 LPG model
kg/h
2.25
7.5mm
28 LPG model
12mm
Internal Fuse Rating
F2L
Condensate Drain
To accept 21.5mm (3/4 in) plastic waste pipe
Flue Terminal
Dimensions
Outercase Dimensions
Casing Height
Overall Height Inc Flue Elbow
Casing Width
Casing Depth
Clearances
Above Casing
Below Casing
Front
Front
L.H. Side
R.H. Side
Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Pump - Available Head
5.5
5
4.5
4
3.5
Metre (wg)
3
2.5
2
1.5
1
0.5
0
200
400
600
Flow Rate (l/h)
10
© Baxi Heating UK Ltd 2011
-
100mm
125mm
copper tails
3/4”
3/4”
3/4”
1/2”
-
780mm
965mm
450mm
345mm
200 mm Min
150 mm Min*
450 mm Min (For Servicing)
5 mm Min (In Operation)
5 mm Min
5 mm Min (In Operation)
*This is the MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
Inlet Pressure (Propane - G31)
mbar
37
0
Diameter
Projection
Connections
Gas Supply
Central Heating Flow
Central Heating Return
Pressure Relief Discharge
Injector (Propane Gas - G31)
24 LPG model
3A
800
1000
1200
5
Central Heating Primary Circuit
Pressures (Sealed Systems)
IPX5D
Heat Output (Condensing)
24 LPG model
NOx Class
150W
160W
External Fuse Rating
Megaflo System 24 & 28 HE IE LPG
Safety Discharge
Max Operating
Min Operating
Recommended Operating Range
bar
3
2.5
0.5
1-2
For ‘Semi-Sealed’ Systems it is recommended that
the system is designed to achieve a pressure of
0.2 bar at the boiler (see Section 6.4).
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
Temperatures
Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
Weights
Packaged Boiler Carton
Installation Lift Weight
24
53.5kg
44kg
28
54.5kg
45kg
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5.0 Dimensions and Fixings
Dimensions
At least
1.5°
G
A 780mm
E
B 345mm
C 450mm
D 116mm Ø Min.
A
E 185mm
(207mm for 80/125mm
flue systems)
F 145mm
G 131mm
B
H 180mm
360° Orientation
H
D
C
Flue Ø 100mm
F
Tap Rail
32.5 mm
Condensate
Drain
130 mm
Heating
Flow
(3/4”)
© Baxi Heating UK Ltd 2011
130 mm
Gas
Inlet
(3/4”)
65 mm
Heating
Return
(3/4”)
Pressure Relief
Valve
(1/2”)
11
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6.0 System Details
6.1
Central Heating Circuit
1. The appliance is intended for fully pumped sealed systems.
However it can be installed in ‘semi-sealed’ systems also.
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.
• When fitting new systems flux will be evident within the
system, which can lead to damage of system components.
• All systems must be thoroughly drained and flushed out
using, for example, Sentinel X300 or X400 or Fernox F3.
They should be used following the flushing agent
manufacturer’s instructions.
• System additives - corrosion inhibitors and flushing
agents/descalers should comply to BS7593 requirements, e.g.
Sentinel X100 and Fernox MB-1 which should be used
following the inhibitor manufacturer’s instructions.
• 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.
• 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 Technical Enquiries.
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.
12
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6.0 System Details
6.4
Stop
Valve
Double
Check
Valve
Mains
Cold
Water
Sealed Systems
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
Temporary
Hose
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 the current edition of I.S. 813
“Domestic Gas Installations”.
Fig. 3
Filling Loop for
Sealed Systems
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.
Header Tank
Non-Return
Valve
‘Semi - Sealed’ Systems
1. ‘Semi - Sealed’ systems require the use of a suitable header
tank and ball cock arrangement to charge and provide
subsequent replenishment of the system.
2. The tank must be placed to provide sufficient head in order
to ensure a minimum system pressure of 0.2 bar.
3. A suitable non - return valve must be fitted in the pipework
between the header tank and heating system.
6.5
Fig. 3a
1. The appliance expansion vessel is pre-charged to 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. For IE, the current edition of I.S. 813 “Domestic Gas
Installations”.
CH
Return
‘Semi-Sealed’
System
Expansion Vessel
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
1/2” 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
Pressure Relief Valve
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).
Discharge Pipe
© Baxi Heating UK Ltd 2011
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7.0 Site Requirements
450mm
5mm Min
5mm Min
7.1
200mm 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. 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 IE
reference should be made to the current edition of I.S. 813
“Domestic Gas Installations” and the current ETCI rules.
780mm
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).
150mm Min*
Fig. 5
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
At least 1.5° 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.
450mm Min
For Servicing
Purposes
5mm Min
In Operation
Fig. 6
14
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7.0 Site Requirement
7.3
Gas Service Cock
Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required. 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 IE this is the current edition of I.S.
813 “Domestic Gas Installations”.
2. The connection to the appliance is a 3/4” copper tail
located at the rear of the gas service cock (Fig. 7).
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 (3/4”).
7.5
Electrical Supply
1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In IE
reference should be made to the current edition of ETCI
rules.
2. The mains supply is 230V ~ 50Hz fused 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 reference should be made to the current edition of
I.S. 813 “Domestic Gas Installations” and the current ETCI
rules.
© Baxi Heating UK Ltd 2011
15
Supplied by HeatingSpares247.com
7.0 Site Requirements
Termination to an internal soil and
vent pipe
Boiler
50mm
per me
tre of
2.5° M
inimum
7.7
Condensate Drain
FAILURE TO INSTALL THE CONDENSATE DISCHARGE
PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE
OPERATION OF THE BOILER
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.
pipe ru
n
fall
1. The condensate outlet 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.
450mm min
External termination via internal discharge
branch
e.g sink waste - downstream
Boiler
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
guidance.
3. The discharge pipe should be run in a proprietary drain pipe
material e.g. PVC, PVC-U, ABS, PVC-C or PP.
50mm
Sink
per me
tre of
2.5° M
inimum
pipe ru
n
fall
Pipe must terminate
above water level but
below surrounding
surface
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 to prevent
sagging.
6. It is advisable to keep the condensate pipe internal.
7. External runs greater than 3 metres or runs in cold areas
should use 32mm waste pipe.
Termination to a drain or gully
Boiler
Pipe must terminate above
water level but below
surrounding surface
50mm
per me
tre of
2.5° M
n
fall
Termination to a purpose made soakaway
Boiler
500mm min
50mm
per me
tre of
2.5° M
inimum
16
© Baxi Heating UK Ltd 2011
pipe ru
fall
9. 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.
10. 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
inimum
8. If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an external
run.
n
Holes in the soak-away must
face away from the building
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)
iii) to a drain or gully
iv) to a purpose made soakaway
Supplied
by HeatingSpares247.com
Terminal Position with Minimum Distance (Fig. 9)
(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
25
25
25
25
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 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
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
D, E, F, G or H is 25mm then the remainder MUST be as B.S.5440-1.
300 min
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.
4. *Reduction to the boundary is possible down to 25mm
but the flue deflector kit (5111068) must be fitted.
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.
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
Terminal
Assembly
Flue
*
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. 8
Property Boundary Line
J,K
T
Air Inlet
U
Opening Window
or Door
N
R
I
M
C
I
I
F
D
E
A
S
I
F
J,K
B
L
G
A
A
H
150mm
MIN.
Fig. 10
H
I
Likely flue positions requiring
a flue terminal guard
© Baxi Heating UK Ltd 2011
Fig. 9
17
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8.0 Flue Options
8.1
(ii)
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.
(i)
3. Maximum permissible equivalent flue lengths are:Horizontal Concentric (15/18 models)
Horizontal
Flues
(60/100)
15 metres
(60/100)
Horizontal Concentric (24/28/32 models) 10 metres
Horizontal Concentric (all)
(80/125)
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
Plume Displacement 60 /100 dia Kit
1M Extensions 45° & 93° elbows
are also available - see Section 9.0
Plume Displacement.
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.
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+(2x90°Bends)
18
© Baxi Heating UK Ltd 2011
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.
Supplied by HeatingSpares247.com
Vertical
Flues
8.0 Flue Options
8.2
(ii)
Twin & Vertical Flue Systems
1. Maximum permissible equivalent flue lengths are:(i)
(60/100)
10 metres
15 metres
Vertical Concentric
Vertical Twin Pipe
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable
pipe supports are available as accessories.
(80/125)
20 metres
2. 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
120mm Min
apart
Y
The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
1m Min to
15m Max
NOTE: Flue length is measured from point (i) to (ii) as
shown.
600mm Min
apart
(ii)
Mini Terminal
on Air Duct
(sited in loft)
(i)
T
Vertical
Flues
(Twin Pipe)
1m Min
to
15m Max
Total Equivalent Length =
A+B+C+1x90°Bend
Roof
Terminal
All vertical and angled runs must be included,
measured from the boiler adaptor (point i) to the
joint with the flue terminal (point ii). One 91.5°
bend or two 135° bends can be included without
reduction of the flue length.
Q
660mm
If further elbows are required the flue length must
be reduced by the following amounts:-
(ii)
1 metre for each 91.5° bend
0.5 metre for each 45° bend
The total equivalent length for this example is
= 6.5 metres.
Equivalent
Length Value
C
B
1m extension
135°bend
91.5°bend
5
2
2
Sub total
5.0m
0.5m
1.0m
Equivalent Length Air Duct = 6.5m
This bend is equivalent to
1 metre
Equivalent
Length Value
A
(i)
1m
0.25m
0.5m
AIR DUCT
No of
fittings/pipes
1m extension
135°bend
91.5°bend
1m
0.25m
0.5m
FLUE DUCT
No of
fittings/pipes
5
2
2
Sub total
5.0m
0.5m
1.0m
Equivalent Length Flue Duct = 6.5m
© Baxi Heating UK Ltd 2011
19
Supplied by HeatingSpares247.com
8.0 Flue Options
8.3
A4
A2
FLUE GROUP N
Twin Flue System 80mm diameter
E
Flue Extension (pair)
1000mm
F
Flue Bend (pair)
90°
G
Flue Bend (2 pair)
135°
J
Vertical Flue Boiler Adaptor Kit
H
Vertical Flue Adaptor
W
Pipe Support (pair)
80mm
Y
Flue Termination Kit
(horizontal termination)
80mm
Z
Single Terminal
80mm
Q
Adaptor
60/80
T
Pitched Roof Terminal
25°/45°
P
E
K,K1
D
C
R
FLUE GROUP G
Flue System 80/125mm diameter
A4
Horizontal Flue Kit
B
Straight Extension Kit
D
Bend Kit (pair)
C
Bend
U
Pipe support
G
F
M
H
U,W
1000mm
135°
91.5°
125mm
FLUE GROUP A, N, G
Vertical Flue Kits
K
Vertical Flue Terminal (use with 5111070)
K1
Vertical Flue Terminal
L
Pitch Roof Flashing
25°/45°
Pitch Roof Flashing
35°/55°
M
Roof Cover Plate
N
Flat Roof Flashing
5111087
5111072
5111086
720089801
5111084
5111081
5120172
5121791
5121792
5106164
5118580
5118584
5118597
5118588
5118610
5111078
5118576
246141
246142
246143
246144
Y,Z
L
N
Q
S
20
Flue Accessories
Key Accessory
Size
Code No
FLUE GROUP A
Concentric Flue System 100mm diameter
A3
Telescopic Internal Flue Kit
315-500mm 5119654
A2
Telescopic Flue (incl elbow)
5118069
A
Horizontal Flue Terminal (incl elbow)
5118489
B
Flue Extension
1000mm 5111074
C
Flue Bend
93°
5111075
D
Flue Bend (pair)
135°
5111085
U
Pipe Support (painted)
100mmØ 5111080
R
Vertical Flue Adaptor
5111070
P
Wall Liner
5111067
S
Flue Terminal Deflector
5111068
A
B
A3
‘MULTIFIT’
© Baxi Heating UK Ltd 2011
J
T
Supplied by HeatingSpares247.com
8.0 Flue Options
8.4
Air Duct Connection
Twin Flue Duct Adaptor
1. The kit allows connection of a twin flue system to the
boiler adaptor.
Flue Duct Connection
8.5
Twin Flue Connection
1. Engage the twin flue duct adaptor in the boiler adaptor,
making sure that it is pushed down as far as possible.
2. Ensure that the air & flue ducts are connected correctly
and that they are adequately supported (at least once every
metre using the available pipe supports).
Boiler Adaptor
3. Ensure that all joints and elbows are fully engaged and
cannot become disconnected during operation.
© Baxi Heating UK Ltd 2011
21
Supplied by HeatingSpares247.com
8.0 Flue Options
8.6
1. In the case of a pitched roof 25 - 50 degrees, position the lead
tile to replace/flash over existing roof tiling. Make an aperture in
the roof suitable for the lower tube of the roof terminal and
ensure the integrity of the roof cover is maintained. The
adjustable plastic collar can either be positioned on the lead tile
or the lower tube of the roof terminal prior to the final
positioning of the vertical flue through the tile. Check the collar is
correctly located to suit required roof pitch (either 25° to 38° or
37° to 50°). From inside the roof adjust the flue to a vertical
position and secure to the roof structure with the clamp supplied.
Approx
1425mm
Cut the same
amount off the
Air Duct &
Flue Duct
For Roof Terminals
2. For flat roof installations the aluminium flashing must be
incorporated into the roof covering and the appropriate aperture
made in the roof decking. The vertical flue is lowered onto the
flashing making sure the collar of the flue locates securely with the
flashing. (A mastic seal may be necessary). From inside the roof,
adjust the flue to a vertical position and secure to the roof
structure with the clamp supplied.
Air Duct
Flue Duct
IMPORTANT: If the boiler is not fitted immediately after the flue
system, temporary precautions must be taken to prevent rain
entry into the room of installation. Any precautionary measures
must be removed prior to commissioning the boiler.
Push Fit Adaptor
8.7
Flue Dimensions
The standard horizontal telescopic flue kit allows for lengths
between 315mm and 500mm from elbow to terminal (Fig. 11).
The maximum permissible equivalent horizontal flue length is:
10 metres (60/100 system, 24/28/32 models)
15 metres (60/100 system, 15/18 models)
20 metres (80/125 system, all models)
m
m
00
5
m
5m
31
8.8
Flue Trim
Flue Deflector
Fig. 11
1. The rubber flue trim supplied may be fitted to either the
outside wall or on the inner wall of installation.
8.9
Terminal Guard (Fig. 12)
1. When codes of practice dictate the use of terminal guards, they
can be obtained from most Plumbers’ and Builders’ Merchants.
2. There must be a clearance of at least 50mm between any part
of the terminal and the guard.
3. When ordering a terminal guard, quote the appliance name
and model number.
4. The flue terminal guard should be positioned centrally over the
terminal and fixed as illustrated.
Fig. 12
22
© Baxi Heating UK Ltd 2011
8.10
Flue Deflector
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.
Supplied by HeatingSpares247.com
93° Elbow/Plume
Outlet Assembly
9.0 Plume Displacement
9.1
60Ø Support
Bracket
O Ring
Kit No 5118638
Content of kit
1 0.9m 60/100 Concentric Flue
1 1m 60 Dia Exhaust Flue Pipe
1 Adaptor
2 60 Dia Support Brackets
1 93° Elbow/Plume Outlet Assembly
1 Flexible Flue Trim
3 “O” Rings
1 ‘Jubilee Clip
1 Elbow
0.9 metres
60Ø Exhaust
Flue Pipe
60Ø Support
Bracket
O Ring
Fig. 13
Plume Displacement Kit (Fig. 14)
Flexible Flue
Trim
1. This kit is recommended for installations where the
condensate plume emitted from the flue may cause a nuisance
or affect the surroundings.
Adaptor
‘Jubilee’ Clip
O Ring
2. The terminal must be positioned outside the building with
the air inlet facing downward and outlet connection upwards.
Elbow
60/100Ø
Concentric Flue
45°
45°
Outlet must be at
least 45° from
wall face
3. The plume outlet must always be at least 45° to the wall,
with the ‘peak’ uppermost to prevent rain entry (Figs. 15 &
16), and be at least 2 metres above ground level. It must be
secured as shown in Fig. 10. The plume outlet must also be at
least 500mm from the air inlet in any direction (Fig. 16).
Fig. 14
‘Peak’ Uppermost
NOTE: The outlet must be positioned so that any
condensate plume is directed away from adjacent surfaces.
There must be a constant fall along the entire length of the
flue system from the outlet back to the boiler.
4. It is possible to reduce or increase (with the addition of
extensions) the length of either or both the 60/100 concentric
and 60Ø exhaust.
5. Standard concentric flue extension kits may be added
between the boiler elbow and the terminal assembly.
6. The minimum length of the concentric flue is 100mm when
measured from the edge of the flue elbow.
500mm Min.
IMPORTANT: The maximum equivalent length of
concentric flue is:- 8 metres (24/28/32)
14 metres (15/18)
Additional bends may be fitted in the concentric flue, but
the equivalent length must be reduced by 1 metre (93°
elbow) or 0.5 metres (45° elbow).
Fig. 15
Air Inlet at Bottom
Fig. 16
7. 60Ø 1 metre extensions (including support bracket), and
additional 93° & 45° elbows are available. Any additional 93°
& 45° elbows must be accounted for when calculating flue
lengths.
NOTE: Permitted positions of the plume outlet relative to
doors, windows etc. are the same as for conventional
concentric flues as detailed in the main Installation &
Servicing Instructions and BS5440 Pt. 1. It is NOT
necessary to fit a terminal guard over the air inlet or the
plume outlet.
© Baxi Heating UK Ltd 2011
23
Supplied by HeatingSpares247.com
9.0 Plume Displacement
9.2
16
14
12
60 Ø Exhaust (metres) X
60 Ø Exhaust (metres) X
14
15/1
8
10
24
8
6
4
12
8
24
8
6
28/
32
2
0
In the graph the solid line diagonal represents the
relationship between the concentric flue assembly (and any
extensions) and the 60Ø exhaust (and any extensions or
additional bends).
15/1
10
4
28/
32
2
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0
15
1
Concentric 60/100 Flue (metres) Y
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Concentric 60/100 Flue (metres) Y
Example 1
Flue Lengths - Not Permissible
Example 2
Flue Lengths - OK
60 Ø Exhaust (metres) X
14
12
15/1
8
10
24
8
Example 1 - Not Permissible
If, for instance, a concentric length of 5 metres was required
and the 60Ø exhaust needed to be 6 metres the graph
shows that this combination would NOT be permissible as
the intersection point would be above the solid diagonal line.
Example 2 - Flue Lengths OK
Where both lengths have been determined they can be
applied to the graph to check that the installation is
permissible. For example, if it was known that 2 metres of
concentric flue and 4 metres of 60Ø exhaust were required,
the values could be applied to the graph as shown in
Example 2. As the point of intersection of the dotted lines is
below the solid diagonal line, the combination of lengths is
shown to be acceptable.
16
6
4
28/
32
2
0
0
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
Concentric 60/100 Flue (metres) Y
Example 3
Flue Lengths - OK
Example 3 - Flue Lengths OK
In the example shown, assume that the concentric part of
the flue needs to be 2.3 metres long. Find the position of
‘2.3’ on the horizontal axis of the graph and then project
upwards to the solid diagonal line. This is represented by the
vertical thick dotted line. Where this dotted line intersects
with the solid diagonal line on the graph, project across to
the vertical axis. As can be seen this corresponds with 6
metres. Therefore, the total equivalent length of the 60Ø
exhaust can be up to 6 metres. Any elbow equivalencies
must be accounted for i.e. 93° elbows are equal to 1 metre,
each 45° elbow to 0.5 metres.
Support
Bracket
60Ø Exhaust
X
Y
45° Elbow
Flue Length - Worked Example
Baxi Megaflo System 28 HE IE
93° Elbow
1 metre Extension
Concentric 60/100 Flue
1 metre supplied in kit
Fig. 17
Concentric Flue
Additional Accessories
93° Elbow
45° Elbow (Pair)
1 metre 60Ø Extension
24
Determining Permissible Lengths
16
© Baxi Heating UK Ltd 2011
5121639
5121370
5121638
Fig. 18
In Fig. 18 opposite an additional 93° elbow and pair of 45°
elbows have been included in the 60Ø exhaust.
Also 3 straight extension pieces have been used.
To calculate total length:Length of 60Ø supplied in kit =
3 x 1 metre Extensions =
1 x 93° Elbow =
2 x 45° Elbow =
1 metre
3 metres
1 metre
1 metre (0.5 metres each)
Total 60Ø =
6 metres
After consulting the table in Example 3 it can be determined
that the concentric flue could be up to approximately 2.3
metres long.
Supplied by HeatingSpares247.com
9.0 Plume Displacement
9.3
General Fitting Notes
1. Cut a hole in the external wall which the concentric flue
assembly will pass through. The hole should allow the flue
to fall back to the boiler at an angle of at least 1.5°.
2. When completed the terminal must be at least 2 metres
above ground level (Fig. 19).
Min. 2 metres
3. Measure and cut to size the concentric assembly and any
extensions that are being used.
4. Insert the concentric assembly through the hole from
outside the building.
5. If required, the flexible flue trim should be fitted prior to
this as it cannot be fitted after. Use the large ‘Jubilee’ clip to
secure the trim to the flue (See Fig. 20, trim shown
dotted), with the screw part of the clip at the bottom.
Fig. 19
6. Connect any extensions or elbows that are being used
to the concentric assembly. Engage the extension, elbow
or concentric assembly in the boiler flue elbow. Fit the
boiler flue elbow to the boiler adaptor.
Flue Trim
7. Ensure that the concentric assembly and any extensions
fall back to the boiler at an angle of at least 1.5° and that
the external air inlet is to the bottom.
8. Use suitable brackets to support the concentric
assembly and any extensions, and make good inside and
outside.
Spigot
Position of ‘Jubilee’ Clip
screw
Fig. 20
9. The 60Ø exhaust can now be fitted. Slide the adaptor
over the plain end of the 60Ø exhaust (Fig. 22) and engage
the exhaust in the terminal. Slide the adaptor down over
the spigot. Mark and drill the adaptor, using a 2mm bit, as
shown in Fig. 21. Secure the adaptor to the spigot using
one of the screws supplied.
50mm
Adaptor
10. If it is necessary to shorten the 60Ø exhaust or any of
the extensions, the excess material must be cut from the
plain end of the pipe.
Fig. 22
30mm
Fig. 21
11. Determine the position of the 60Ø exhaust and mark
on the wall a suitable position for the support bracket. If
extensions are being used, a support bracket is supplied in
each kit.
12. Drill the wall, and fit the bracket(s) using the plug and
screw provided.
30mm
13. Mark and drill the 60Ø exhaust, using a 2mm bit, as
shown in Fig. 23. Complete the installation of the 60Ø
exhaust, securing in the brackets.
Fig. 23
Fig. 24
© Baxi Heating UK Ltd 2011
14. Fit the 93° elbow/plume outlet and secure with the
two remaining screws supplied. Ensure the plume outlet is
at least 45° to the wall and that the ‘peak’ is uppermost
(Fig. 24).
25
Supplied by HeatingSpares247.com
9.0 Plume Displacement
Plume Outlet
Elbow
9.3
General Fitting Notes (cont.)
15. For aesthetic purposes it is permissible to route the
60Ø exhaust in an enclosed box, but the air inlet and
plume outlet MUST remain in free air.
16. It is also possible to separate the plume outlet from the
93° elbow to allow the flue to be installed as shown in
Fig. 25.
50
0m
m
Mi
n.
17. To do this, first slacken the two screws retaining the
plume outlet to the elbow, and remove the outlet (Fig. 26).
The elbow can now be used to connect the vertical to
horizontal 60Ø exhaust (Fig. 25). Retighten the screws in
the elbow.
Fig. 25
18. The outlet can now be fitted into the female end of an
60Ø extension piece. It must be secured using two of the
screws supplied in the bag with the ‘Jubilee’ clip.
19. Mark the female end of the extension at 30mm as
shown in two positions, directly opposite each other
(Fig. 27).
Fig. 26
30mm
20. Using a suitable bit (e.g. 2mm), drill through the
extension and outlet. Secure using two of the screws
supplied.
21. The remaining screw must be used to secure the
adaptor to the concentric terminal.
Fig. 27
22. When the plume outlet is positioned under a balcony
or other projection (Fig. 28) it must protrude at least
200mm (it is not necessary to extend it further than this).
Also it must be suitably supported.
200mm Min.
23. When under balconies or projections it is permissible to
rotate the concentric flue length up to 70°, clockwise or
anti-clockwise (Fig. 29), if there is insufficient space to
connect vertically.
24.This will allow the connection of the exhaust to the
outlet spigot.
25. All other minimum & maximum dimensions must be
adhered to, and the air inlet positioned such that it will not
be subject to rain entry.
Fig. 28
70°
Concentric Flue Length
(shown end-on)
Outlet Spigot
26
© Baxi Heating UK Ltd 2011
Fig. 29
Supplied by HeatingSpares247.com
10.0 Installation
10.1
Unpacking & Initial Preparation
The gas supply, gas type and pressure must be checked for
suitability before connection (see Section 7.4).
Remove staples, open flaps and remove the cardboard
sheet.
Remove the polystyrene side pieces and literature. Two
people can then lift out the boiler.
NOTE: a small amount of water may drain from the
boiler in the upright position.
Fig. 30
1. After considering the site requirements
(see Section 7.0) position the fixing template on the wall
ensuring it is level both horizontally and vertically.
2. Mark the position of the two most suitable fixing slots for
the wall plate and boiler lower fixing holes. It is preferable to
use the vertical fixing slots.
3. Mark the position of the centre of the flue hole (rear
exit). For side flue exit, mark as shown (Fig. 34).
4. If required, mark the position of the gas and water pipes.
Remove the template.
5. Cut the hole for the flue (minimum diameter 116mm).
Fig. 31
6. Drill the wall as previously marked to accept the wall
plugs supplied. Secure the wall plate using the fixing screws.
7. Using a spirit level ensure that the plate is level before
finally tightening the screws.
145mm
8. 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.
For Side Flue Exit
10.2
Flushing
Fig. 34
1. Connect a tube to the central heating flow or return pipe
(Fig. 35).
2. Flush thoroughly (see System Details, Section 6.2).
Flushing Tube
Wall Plate
Central Heating Return
© Baxi Heating UK Ltd 2007
Fig. 35
27
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10.0 Installation
10.3
Fitting The Boiler
1. Lift the boiler by holding as shown by the shaded areas.
The boiler should be lifted by TWO PEOPLE. Engage the
slots at the top rear of the boiler on the wall plate (Fig. 36)
(see Safe Manual Handling page 5).
2. Ease the boiler forwards and remove the sealing caps from
the boiler connections.
NOTE: A small amount of water may drain from the
boiler once the caps are removed.
3. Insert the sealing washers between the valves and pipes
on the wall plate and the boiler connections. The rubber
washers must be used on the gas connection.
4. Tighten all the connections.
Fig. 36
10.4
Fitting the Safety Pressure Relief Discharge
Pipe (Fig. 38)
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.
3. The pipework must be at least 15mm diameter and run
continuously downwards to a discharge point outside the
building. See section 6.7 for further details.
Pressure Relief Valve
Fig. 38
4. Utilising one of the sealing washers, connect the discharge
pipe to the adaptor and tighten the nut.
5. Complete the discharge pipework and route it to the
outside discharge point.
IMPORTANT: Make all soldered joints before connecting
to the pressure relief valve.
10.5
Discharge Pipe
Condensate Drain (see section 7.7)
1. Connect the condensate drain to the trap outlet pipe.
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”.
2. The connection 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.
28
© Baxi Heating UK Ltd 2007
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10.0 Installation
10.6
m
0m
50
Fitting The Flue
HORIZONTAL TELESCOPIC FLUE
m
m
15
3
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.
Terminal Assembly
2. The two sections can be adjusted to provide a length
between 315mm and 500mm (Fig. 20) when measured
from the flue elbow (there is 50mm engagement into the
elbow).
Connection Assembly
Fig. 39
3. Locate the flue elbow on the adaptor at the top of the
boiler. Set the elbow to the required orientation (Fig. 41).
NOTE: The flue elbow is angled at 93 degrees to
ensure a fall back to the boiler.
75mm
4. Measure the distance from the outside wall face to the
elbow. This dimension will be known as ‘X’ (Fig. 40).
5. If the distance from the flue elbow to the outside face of
the wall (‘X’ in Fig. 40) is less than 250mm the Connection
Assembly can be discarded and the Terminal Assembly
fitted directly into the elbow.
Wall Thickness
Flue Elbow
(X)
Apply Lubricant for
ease of assembly.
Ensure Elbow is fully
engaged into Boiler
Adaptor
Adaptor
6. In instances where the dimension ‘X’ (Fig. 40) 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’.
Fig. 41
(X)
Wall Thickness
Fig. 40
© Baxi Heating UK Ltd 2011
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10.0 Installation
’
‘Y
ion
ens
Dim
10.6
Fitting the Flue (Cont)
Securing Screw
Fig. 42
‘Peak’ to be uppermost
8. Adjust the two telescopic sections to dimension ‘Y’
(Fig. 42). Ensure that the rivets and holes in the Connection
Assembly are aligned horizontally (Fig. 43).
9. Using a 2mm bit, drill through the holes at the end of the
Connection Assembly into the Terminal Assembly and
secure them together using the screws supplied (Fig. 42).
Seal the joint with the tape provided (Fig. 44).
10. Remove the flue elbow and insert the flue through the
hole in the wall. Refit the elbow to the boiler adaptor,
ensuring that it is pushed fully in (Fig. 41).
Rivet & Hole to be
aligned on horizontal
centreline
Fig. 43
11. Draw the flue back through the wall and engage it in
the elbow. It may be necessary to use soap solution or
similar to ease assembly of the elbow adaptor and flue
(Fig. 44).
Sealing Tape
Apply Lubricant for
ease of assembly.
Ensure Flue is fully
engaged into Flue
Elbow
12. Ensure that the terminal is positioned with the slots to
the bottom (Fig. 45).
IMPORTANT: It is essential that the flue terminal is fitted
as shown to ensure correct boiler operation and prevent
water entering the flue.
13. Make good between the wall and air duct outside the
building.
Fig. 44
14. Fit the flue trim if required, and if necessary fit a terminal
guard (see Section 8.8 & 8.9).
CONCENTRIC VERTICAL FLUE
15. Once the length of the vertical concentric extension has
been determined mark and carefully cut off the excess
material. The cut end MUST be square and free of burrs to
ensure correct insertion into the boiler adaptor.
Slots at bottom
16. Measure 25mm from the end of the flue extension and
apply a length of tape around the outer duct (Fig. 46).
Fig. 45
17. Engage the extension into the adaptor up to this
position (Fig. 47). Once the installation of the flue is
complete and all support brackets are securely in place
remove the tape.
25mm
Extension
Adaptor
Tape
Cut End
Fig. 46
Apply Lubricant for
ease of assembly.
Ensure Extension is
fully engaged into
Boiler Adaptor
30
© Baxi Heating UK Ltd 2011
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10.0 Installation
10.7
Making The Electrical Connections
The boiler is fitted with a 1.3m length of 3 core of cable.
This can be connected to the fused 3A 230V 50HZ supply.
NOTE: Both the Live and Neutral connections are fused.
To connect an external control proceed as follows:1. Slacken the facia panel securing screws and lift the
outercase panel so that its securing tabs are clear of the
facia. Remove the panel.
Cable Clamp
Fig. 49
2. Completely undo the screws securing the facia panel and
hinge it down (Fig. 48).
Terminal Block Cover
3. Undo the terminal block cover securing screw and
remove the cover (Fig. 48).
Fig. 48
4. Slacken the unused cable clamp on the LH side of the
boiler chassis (Fig. 49). Insert the external control wiring
through the clamp and route it to the terminal block.
5. Refer to the instructions supplied with the control.
Facia Panel
IMPORTANT: The external control MUST be suitable
for 230V switching and fused 3A maximum.
6. Remove the link between terminals 1 & 2. The switched
output from the external control must be connected to
terminal 1. (Fig. 50).
Always fit fast
blow 2A fuse
230V
Fused supply 3A
230V ~ 50Hz
1
bk
2
bk
Earth (green/yellow)
g/y
Neutral (blue)
b
Live (brown)
br
7. Ensure that the external control input cable(s) have
sufficient slack to allow the control box to drop down.
Tighten the cable clamp on the boiler chassis.
8. Replace the terminal block cover, routing the external
control input cable(s) through the second cut-out.
10.8
Terminal Block
Fig. 50
© Baxi Heating UK Ltd 2011
Fuses
Preliminary Electrical Checks
1. Prior to commissioning the boiler preliminary electrical
system checks should be carried out.
2. These should be performed using a suitable meter, and
include checks for Earth Continuity,
Resistance to Earth, Short Circuit and Polarity.
31
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Heat Exchanger
Automatic Air Vent
11.0 Commissioning
Fig. 51
11.1
Commissioning the Boiler
1. Reference should be made to BS:EN 12828 & 14336 when
commissioning the boiler.
2. At the time of commissioning, complete all relevant
sections of the Benchmark Checklist at the rear of this
publications.
Screw
IMPORTANT: The heat exchanger air vent on top of the
boiler (Fig. 51) MUST be opened before filling the primary
system.
Pump
Automatic Air
Vent
3. On sealed systems ensure that the filling loop is connected
and open, and on ‘semi-sealed’ systems the feed to the
header tank is open. Open the heating flow and return valves
on the boiler.
4. Open the screw on the automatic air vent on the pump
body (Fig. 52).
5. The system must be flushed in accordance with BS 7593
(see Section 6.2) and the flushing agent manufacturers
instructions.
Pump
Fig. 52
2
1
3
4
0
bar
Selector Switch
Display
Pressure Gauge
Fig. 53
7. Turn the gas supply on and purge the system according to
I.S. 813 “Domestic Gas Installations”.
8. Test for gas tightness.
2
1
3
4
0
bar
Central Heating
Temperature Control
Fig. 54
6. On sealed systems it is recommended to pressurise the
system to 1.5 bar then close and disconnect the filling loop.
On ‘semi-sealed’ systems ensure that the gauge is showing at
least 0.2 bar.
Calibration Control
9. Hinge the facia panel upwards and refit the case front
panel. Tighten the securing screws.
IMPORTANT: The combustion for this appliance has
been checked, adjusted and preset at the factory for
operation on the gas type specified on the appliance data
plate. No measurement of the combustion is necessary.
Do not adjust the air/gas ratio valve.
10. Having checked:
• That the boiler has been installed in accordance with
these instructions.
• The integrity of the flue system and the flue seals.
• The integrity of the boiler combustion circuit and the
relevant seals.
Proceed to put the boiler into operation as follows:
32
© Baxi Heating UK Ltd 2011
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11.0 Commissioning
11.2
Central Heating
Temperature Control
Selector Switch
1. Ensure that all controls are calling for heat, and the selector
switch is in the central heating and hot water position (
).
The current boiler temperature is shown on the display.
Calibration
Control
Fig. 55
2. To check the gas rate it is necessary to set the boiler to
‘Calibration Mode’.
Display
3. Turn both temperature control knobs fully anticlockwise,
then quickly turn the Calibration Control knob 1/4 clockwise
twice and back fully anticlockwise (Fig. 55).
2
3
1
Check the Operational (Working) Gas Inlet
Pressure
4
0
bar
Central Heating
Temperature Control
4. The display will now alternate between ‘SF’ and the current
boiler temperature and both green LEDs will flash (Figs. 56 &
57).
Calibration Control
5. Turn CH temperature control knob fully clockwise. As the
knob is turned the display will change from ‘0’ to ‘00’ (Fig. 58)
indicating maximum rate, then revert to ‘P’ alternating with the
current boiler temperature (Figs 59 & 60).
6. With the boiler operating in the maximum rate condition
check that the operational (working) gas pressure at the inlet
gas pressure test point (Fig. 55a) is in accordance with B.S.
6798 & B.S. 6891.
7. Ensure that this inlet pressure can be obtained with all other
gas appliances in the property working.
Gas Pressure
Test Point
Gas Valve
Measure the Gas Rate
8. With any other appliances & pilot lights turned OFF the gas
rate can be measured. It should be between:(Natural Gas)
15 model
1.69 m3/h
18 model
1.95 m3/h
24 model
2.61 m3/h
28 model
3.1 m3/h
32 model
3.48 m3/h
Fig. 55a
(Propane)
24 model
28 model
Fig. 56
Fig. 57
1.92 kg/h
2.25 kg/h
Note that for Propane appliances the rate is expressed as
kilograms used per hour.
9. The ‘Calibration Function’ is active for 20 minutes unless the
maximum CH temperature is exceeded.
10. The function can be disabled at any time by turning the
Calibration Control knob.
Fig. 58
Fig. 59
© Baxi Heating UK Ltd 2011
11. Carefully read and complete all sections of the Benchmark
Commissioning Checklist at the rear of this publication that are
relevant to the appliance and installation. These details will be
required in the event of any warranty work. The publication
must be handed to the user for safe keeping and each
subsequent regular service visit recorded.
Fig. 60
12. For IE, it is necessary to complete a “Declaration of
Conformity” to indicate compliance with I.S. 813. An example
of this is given in I.S. 813 “Domestic Gas Installations”. This is in
addition to the Benchmark Commissioning Checklist.
33
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12.0 Completion
12.1
Case Front Panel
Completion
1. Instruct the user in the operation of the boiler and
system including the integral timer, explaining the
operational sequence.
2. Set the central heating and hot water temperature
control knobs to the requirements of the user.
3. Carefully read and complete all sections of the Gas
Boiler Commissioning Checklist at the rear of this
publication that are relevant to the appliance and
installation. These details will be required in the event of
any warranty work. The publication must be handed to the
user for safe keeping and each subsequent regular service
visit recorded.
4. For IE, it is necessary to complete a “Declaration of
Conformity” to indicate compliance with I.S. 813. An
example of this is given in I.S. 813 “Domestic Gas
Installations”. This is in addition to the Gas Boiler
Commissioning Checklist.
5. Hand over the Users Operating, Installation and
Servicing Instructions giving advice on the necessity of
regular servicing.
Facia Panel
34
© Baxi Heating UK Ltd 2011
Fig. 61
Supplied by HeatingSpares247.com
13.0 Servicing
13 .1
Annual Servicing
1. For reasons of safety and economy, it is recommended that
the boiler is serviced annually. Servicing must be performed by
a competent person in accordance with B.S. 7967-4.
Case Front Panel
2. After servicing, complete the relevant Service Interval Record
section of the Commissioning Checklist at the rear of this
publication.
IMPORTANT: During routine servicing, and after any
maintenance or change of part of the combustion circuit, the
following must be checked:• The integrity of the complete flue system and the flue seals.
• The integrity of the boiler combustion circuit and relevant
seals as described in Section 13.2.
• The operational gas inlet pressure as described in Section
11.2.1 to 11.2.7 and the gas rate as described in 11.2.8.
• The combustion performance as described in ‘Check the
Combustion Performance’ (13.1.4 to 13.1.6 below).
3. Competence to carry out Checking Combustion
Performance
B.S. 6798 ‘Specification for Installation & Maintenance of Gas
Fired Boilers not exceeding 70kW’ advises that:-
Fig. 62
Facia Panel Securing
Screws
• The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas
analyser and the interpretation of the results.
• The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers’ requirements.
• Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which covers the
use of electronic portable combustion gas analysers in
accordance with BS 7967, Parts 1 to 4.
Check the Combustion Performance (CO/CO2 ratio)
4. Set the boiler to operate at maximum rate as described in
Section 15.1.1 to 15.1.6.
5. Remove the plug from the flue sampling point, insert the
analyser probe and obtain the CO/CO2 ratio. This must be
less than 0.004.
6. If the combustion reading (CO/CO2 ratio) is greater than
this, and the integrity of the complete flue system and
combustion circuit seals has been verified, and the inlet gas
pressure and gas rate are satisfactory either:
• Perform the ‘Annual Servicing - Inspection’ (Section 13.2) &
re-check
• Adjust the gas valve (Section 15.0) & re-check
• Replace the gas valve (Section 14.24) & re-check
Inner Door
Panel
13.2
Fig. 63
Annual Servicing - Inspection
1. Ensure that the boiler is cool.
2. Ensure that both the gas and electrical supplies to the
boiler are isolated.
Condensate
Trap
3. Slacken the screws securing the facia panel. Lift the outercase
panel so that its securing tabs are clear of the facia. Remove the
panel, allowing the facia to hinge down (Fig. 62).
4. Remove the screws securing the inner door panel. Lift the
panel slightly to disengage it from the studs on top of the case
(Fig. 63).
Sump
Fig. 64
© Baxi Heating UK Ltd 2011
5. Unscrew the sump from the bottom of the condensate trap
assembly (Fig. 64) and remove any deposits from the sump and
trap. Clean as necessary and replace the sump
35
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Burner
4 ±0.5
13.0 Servicing
Viewing Window
13.2
Annual Servicing - Inspection (Cont)
6. Undo the nut on the gas inlet pipe to the venturi (Fig. 65)
and pull the sensing pipe off the fan.
7. Disconnect the electrode leads, noting their position, and
the fan electrical plugs (Fig. 66).
Sensing
Electrode
7.5
±1
Spark Ignition
Electrode
8. Undo the four nuts retaining the combustion box cover
to the heat exchanger.
10 ±1
9. Carefully draw the fan, collector and cover assembly
forward, being careful to retain the injector in the venturi
(Figs. 65 & 66).
Electrode Position
10. Clean any debris from the heat exchanger and check
that the gaps between the tubes are clear.
Fan, Collector and Cover
Assembly
11. Inspect the burner, electrodes position and insulation,
cleaning or replacing if necessary. Clean any dirt or dust
from the air box.
12. Reassemble in reverse order.
NOTE: The sensing pipe must be reconnected to the
fan, not the venturi.
Electrode
Leads
13. Complete the relevant Service Interval Record section of
the Commissioning Checklist at the rear of this publication
and then hand it back to the user.
Fig. 66
Venturi
Injector
Fig. 65
36
Gas Inlet Pipe
© Baxi Heating UK Ltd 2011
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14.0 Changing Components
Bracket
Igniter
Igniter Feed
Plug
IMPORTANT: When changing components ensure that
both the gas and electrical supplies to the boiler are
isolated before any work is started. When the
component has been changed turn the selector switch
fully anticlockwise against the spring pressure to the
reset position and hold for 5 seconds to reset the boiler
before recommissioning.
See Section 13.2 “Annual Servicing” for removal of case
panel, door etc.
14.1
Electrode
Leads
Igniter (Fig. 67)
1. Disconnect the igniter feed plug and the electrode leads,
noting their positions.
Fig. 67
2. Undo the screw securing the bracket to the boiler.
3. Remove the igniter and transfer the bracket to the new
component.
4. Reassemble in reverse order.
14.2
Spark and Sensing Electrodes (Fig. 68)
1. Disconnect the electrode leads, noting their positions.
2. Remove the retaining screws securing each of the
electrodes to the combustion box cover and remove the
electrodes.
3. Check the condition of the sealing gaskets and replace if
necessary. Reassemble in reverse order.
Spark
Electrode
Electrode
Leads
Sensing
Electrode
Fig. 68
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14.0 Changing Components
14.3
Fan (Fig. 69)
1. Undo the nut on the gas inlet pipe to the venturi (Fig. 70)
and pull the sensing pipe off the fan.
2. Disconnect the electrode leads, noting their position and
disconnect the fan electrical plugs.
3. Undo the screws securing the collector to the extension
piece.
4. Remove the collector and fan assembly, being careful to
retain the injector in the venturi.
5. Undo the screws securing the fan to the venturi and fit the
new fan. On 18 models ONLY transfer the fan inlet flange to
the new fan. Replacing the seal if necessary.
6. Examine the burner gasket and replace if necessary.
Venturi
7. Reassemble in reverse order, ensuring that the injector is
in place and the sensing pipe is connected to the fan.
Injector
14.4
Venturi (Fig. 69)
Cover
1. Remove the collector and fan assembly as described in
section 14.3.
2. Extract the injector from the venturi.
Gas Inlet Pipe
Fig. 70
3. Undo the screws securing the fan to the venturi and the
venturi to the collector.
Fan Inlet Flange
IMPORTANT: When fitting the new venturi, ensure the
arrows on it’s base point into the collector (Fig. 71).
(18 model only)
Gas Inlet
Fan
4. Examine the seals and burner gasket, replace if necessary.
5. Reassemble in reverse order, ensuring that the injector is
in place.
14.5
Venturi
Injector
Injector (Fig. 69)
1. Remove the collector and fan assembly as described in
section 14.3.
Collector
Fig. 69
2. Extract and replace the injector and reassemble in reverse
order.
Fig. 71
When fitting the venturi
ensure that the arrow is
pointing forward
38
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14.0 Changing Components
Cover
14.6
Burner
Burner (Fig. 72)
1. Undo the screws securing the collector to the venturi and
extension piece. Remove this extension piece from the
cover (not on 28/32 models).
Gasket
Extension Piece
(Not on 28/32 models)
2. Withdraw the burner from the cover and replace with
the new one.
3. Examine the gasket, replacing if necessary.
4. Reassemble in reverse order.
Venturi
14.7
Insulation (Fig. 73)
1. Remove the electrode leads, noting their positions. Also
remove the electrodes as described in section 14.2.
Collector
Fig. 72
2. Undo the screws securing the collector to the venturi and
the nuts holding the cover to the heat exchanger. Draw the
collector and cover assembly away.
3. Remove the cover insulation piece.
4. Fit the new insulation carefully over the burner and align
it with the slots for the electrodes.
5. If the rear insulation requires replacement remove it and
all debris from the heat exchanger. Also it may be necessary
to separately remove the spring clip from the pin in the
centre of the heat exchanger and the ‘L’ shaped clips
embedded in the insulation.
6. DO NOT remove the shrink-wrapped coating from the
replacement rear insulation. Keep the insulation vertical and
press firmly into position.
Heat
Exchanger
7. Examine the cover seal and replace if necessary.
Rear
Insulation
Spark
Electrode
Cover
Insulation
Venturi
Seal
Fig. 73
Collector
Electrode
Leads
Sensing
Electrode
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14.0 Changing Components
Electrical
Plug
14.8
Flue/Heat Exchanger
Thermostat Sensor
Flue/Heat Exchanger Thermostat Sensor
(Fig. 74)
1. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
2. Turn the sensor 90o anticlockwise to remove - it is a
bayonet connection.
3. Reassemble in reverse order.
14.9
Fig. 74
System Pressure Microswitch (Fig. 76)
1. Remove the two wires from the microswitch.
2. Undo the screw securing the microswitch to the valve
body.
3. Reassemble in reverse order.
14.10
Central Heating Temperature Sensor (NTC)
(Fig. 75)
1. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
Flow Pipe
2. Unscrew the sensor from it’s pocket and reassemble in
reverse order. The plug will only fit one way.
Central Heating
Temperature Sensor
14.11
Safety Thermostat (Fig. 75)
1. Pull the plug off the thermostat.
2. Remove the screws securing the thermostat to the
mounting plate on the flow pipe.
3. Reassemble in reverse order, ensuring that the plug is
pushed fully on.
Safety Thermostat
14.12
Return Heating Temperature Sensor (Fig. 77)
1. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
Fig. 75
2. Prise the sensor retaining clip off the pipe and remove the
sensor from the clip.
3. Reassemble in reverse order.
Return Heating
Temperature Sensor
Microswitch
Fig. 76
Fig. 77
40
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14.0 Changing Components
14.13
Pump - Head Only (Fig. 78)
1. Drain the primary circuit and remove the socket head
screws securing the pump head to the body and draw the
head away.
2. Undo the screw on the pump wiring cover and remove
the cover. Using a suitable flat bladed screw driver press the
cable securing levers downwards to release each wire after
noting their position.
3. A standard replacement Grundfos 15-60 head can now
be fitted. Connect the pump wiring to the new head. The
pump speed must be set to 3 (Fig. 79).
4. Reassemble in reverse order.
14.14
Pump - Complete (Fig. 80)
1. Drain the primary circuit.
Pump Wiring
Cover
2. Undo the two screws securing the body to the pipe and
manifold and draw the pump forwards.
Pump Body
3. Undo the screw on the pump wiring cover and remove
the cover. Using a suitable flat bladed screw driver press the
cable securing levers downwards to release each wire after
noting their position.
Socket Headed
Screw
4. Unscrew the automatic air vent from the pump body.
5. Connect the wiring to the new pump. Examine the ‘O’
ring seals on the return pipe and manifold, replacing if
necessary.
Pump Head
6. Fit the air vent to the pump body and reassemble in
reverse order.
Fig. 78
14.15
1. Drain the primary circuit and unscrew the automatic air
vent from the pump body.
Pump Setting
Fig. 79
Automatic Air Vent (Fig. 80)
2. Examine the ‘O’ ring seal, replacing if necessary, and fit it
to the new automatic air vent.
Automatic Air
Vent
3. Reassemble in reverse order.
Pump Wiring
Cover
Fig. 80
© Baxi Heating UK Ltd 2011
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14.0 Changing Components
14.16
Gauge Retaining
Bracket
Pressure Gauge (Figs. 81 & 82)
1. Drain the primary circuit and undo the nut on the
pressure gauge capillary.
2. Undo the screws securing the gauge retaining bracket.
3. Remove the bracket and gauge assembly. Depress the
barbs on the side of the gauge and remove the retaining
bracket.
Pressure Gauge
Fig. 81
4. Examine the sealing washer, replace if necessary.
5. Reassemble in reverse order.
14.17
Pressure Relief Valve (Fig. 83)
1. Drain the primary circuit.
Pressure Gauge
Capillary
Fig. 82
2. Disconnect the discharge pipe from the valve. Using a
suitable hexagon key undo the grub screw sufficiently to
release the valve.
3. Note the orientation of the valve, rotate it and withdraw
it from the manifold.
4. Fit the new valve and ‘O’ ring seal and set to the
previously noted orientation. Reassemble in reverse order.
‘O’ Ring
Seal
Grub Screw
Discharge Pipe
Fig. 83
42
© Baxi Heating UK Ltd 2011
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14.0 Changing Components
14.18
P.C.B. (Fig. 85)
1. Note the settings of the temperature control knobs,
rotate them fully anticlockwise and carefully pull them off
the drive pins.
2. Completely undo the screws securing the control box
cover and release the cover retaining barbs from their slots.
Disengage the rear of the cover from the control box hinge
pin (Fig. 84).
3. Note the position of all plugs and wires on the P.C.B. and
disconnect them.
4. Undo the securing screws and remove the P.C.B. Transfer
the control knob drive pins to the new P.C.B. and turn them
fully anticlockwise.
Control Box Cover
Fig. 84
P.C.B.
5. Reassemble in reverse order, ensuring that the
temperature controllers are reset to their previous positions.
14.19
Selector
Switch
Selector Switch (Fig. 85)
1. Note the setting of the selector switch knob and carefully
pull it off the facia.
Drive Pins
2. Completely undo the screws securing the control box
cover and release the cover retaining barbs from their slots.
Disengage the rear of the cover from the control box hinge
pin (Fig. 84).
3. Note the position of the electrical connections and the
orientation of the switch. Remove the electrical connections.
4. Remove the screws securing the switch to the facia panel.
Facia
Selector Switch Knob
5. Fit the new switch, ensuring that it is correctly positioned
and reassemble in reverse order.
Temperature Control Knobs
Fig. 85
© Baxi Heating UK Ltd 2011
43
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14.0 Changing Components
14.20
Gas Valve (Fig. 84)
IMPORTANT: After replacing the valve the CO2 must be
checked and adjusted as detailed in Section 15.0 Setting
the Gas Valve. Only change the valve if a suitable
calibrated combustion analyser is available, operated by a
competent person - see section 13.1.
Gas Valve
Sensing Pipe
1. Turn the gas cock off and undo the nut on the gas feed
elbow under the boiler.
Power Lead
2. Remove the screws securing the gas valve to the boiler
bottom panel.
3. Pull off the power lead, earth lead and sensing pipe.
Earth Lead
4. Undo the nut on the gas pipe at the gas/air inlet and the gas
valve. Remove the pipe, taking care not to lose the sealing
washers. Remove the valve.
Gas Feed
Elbow
5. Reassemble in reverse order., ensuring that all seals are in
place and the injector is fitted.
Fig. 86
Throttle
Adjustment Screw
NOTE: To assist the boiler to light prior to final setting,
use a suitable hexagon key to wind out the Throttle
adjustment screw until it is flush with the valve body, then
turn the screw 4 full turns clockwise (Fig. 86a). If the boiler
will not light, or the correct CO2 cannot be achieved
contact the ‘heateam’ technical helpline.
14.21
Fig. 86a
Expansion Vessel (Fig. 87)
1. Drain the primary circuit and undo the nut on the vessel
connection pipe.
2. Undo and remove the locknut securing the vessel spigot to
the boiler air box.
Retaining Bracket
3. Remove the bracket and vessel from the boiler.
Expansion Vessel
4. Locate the retaining bracket on the upper flange of the
vessel and fit to the boiler.
5. Reassemble in reverse order.
Boiler Chassis
Lock Nut
Fig. 87
44
© Baxi Heating UK Ltd 2011
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x2
15.0 Setting the Gas Valve
15.1
Central Heating
Temperature Control
Selector Switch
IMPORTANT: The CO2 must be only be checked and
adjusted to set the valve if a suitable calibrated
combustion analyser is available, operated by a
competent person - see Section 13.1
Calibration
Control
Fig. 88
1. The combustion (CO2) may be checked after running the
boiler for several minutes. To do this it is necessary to set
the boiler to ‘Calibration Mode’.
Display
2. Ensure that all external controls are calling for heat. The
actual current boiler temperature is shown on the display.
2
3
1
Setting the Gas Valve (CO2 check)
4
0
bar
Central Heating
Temperature Control
3. Turn both control knobs fully anticlockwise, then quickly
turn the right hand knob 1/4 clockwise twice and back fully
anticlockwise (Fig. 88).
Calibration Control
4. The display will now alternate between ‘SF’ and the
current boiler temperature and both green LEDs will flash
(Figs. 89 & 90).
5. Turn the left hand knob fully clockwise. As the knob is
turned the display will change, indicating the fan speed.
6. The display will show ‘00’, indicating maximum rate, then
revert to ‘P ‘ alternating with the current boiler temperature
(Figs. 91, 92 & 93).
Fig. 90
Fig. 89
Fig. 92
Fig. 91
7. Remove the plug from the flue sampling test point. Insert
the analyser probe and allow sufficient time for the reading
to settle (Fig. 94).
The CO2 should be:- N.G. 8.7% ± 0.2
L.P.G. 10% ± 0.2
Fig. 93
Flue Adaptor Test
Point
8. It is possible to alter the CO2 by adjustment of the gas
valve. Remove the plastic cover from the Throttle
Adjustment Screw. At maximum rate the Throttle
Adjustment Screw should be turned, using a suitable
hexagon key, until the correct reading is obtained (Fig. 95).
Turning clockwise will reduce the CO2. Anticlockwise will
increase the CO2.
Plug
Analyser Probe
Fig. 94
Offset
Adjustment Screw
(cap fitted)
Reduce CO2
at min. rate
Increase CO2
at min. rate
Gas Valve
If the CO2 is reset at minimum
rate it must be rechecked at
maximum rate again and adjusted
if required. If the CO2 is reset at
maximum rate it must be
rechecked at minimum rate and
adjusted if required.
© Baxi Heating UK Ltd 2011
9. The CO2 must then be checked at minimum rate. Turn
the left hand knob fully anti-clockwise. As the knob is turned
the display will change, indicating the fan speed. When the
display reads ‘ 0’ the boiler runs at minimum rate.
The CO2 should be:- N.G. 8.4% ± 0.2.
28kW L.P.G. 9.8% ± 0.2
24kW L.P.G. 9.5% ± 0.2
Throttle
Adjustment Screw
(cover removed)
Fig. 94
Reduce CO2
at max. rate
10. With the boiler on minimum, the Offset Adjustment
Increase CO2
Screw must be altered, using a suitable hexagon key, after
at max. rate
Do not turn the adjustment
screws more than 1/8 of a turn at
a time. Allow the analyser reading
to settle before any further
adjustment
removing the cap (Fig. 95). Turning anti-clockwise will reduce
the CO2. Clockwise will increase the CO2.
11. The ‘Calibration Function’ is maintained for 20 minutes
unless the maximum CH temperature is exceeded. The
function can be disabled at any time by turning the right
hand knob.
12. Check the Combustion Performance (CO/CO2 ratio).
This must be less than 0.004.
45
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16.0 Electrical
16.1
Central Heating
NTC Sensor
Illustrated Wiring Diagram
b
b
Overheat Stat
Water Pressure
Microswitch
b
r
Return Heating
Temperature Sensor
b
r
w
Flue Sensor
1
4
b
2
br
5
b
g
bk
Fan
3
1
g
2
g
b
b
b
g/y
br
X400
X401
9 87 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2 1
Control PCB
X9
X501
1
2
1
X1
2
3
4
1
5
X2
2
3
4
5
6
7
8
9
r
bk
X3
b
br
Flame
Sensing
Electrode
Pump
br
br
b
br
b
b
b
br
L
Spark
Generator
N
b
b
a
br
bk
g
w
br
Gas Valve
b
Link
g/y
Ignition
Electrode
b
bk
br
r
Mains Input Cable
br
bk
b
w
46
© Baxi Heating UK Ltd 2011
- brown
- black
- blue
- white
g - green
g/y - green / yellow
r
- red
br
b
Supplied by HeatingSpares247.com
17.0 Short Parts List
Short Parts List
Key
No.
G.C.
No.
Description
Manufacturers
Part No.
306
315
316
311
419
422
302
Flue Thermostat
5114747
306
Burner (15/18/24/28)
5122149
Burner (32)
5114698
311
Fan
5121447
315
Igniter Electrode
720222801
316
Sensing Electrode
720222901
415
Pump
248042
419
Microswitch
248067
420
Overheat Thermostat
5114729
421
NTC Sensor
5114725
422
Gas Valve
720301001
434
NTC Sensor (Return)
5114725
503
504
PCB IE 15
5129831
PCB IE 18
5129832
PCB IE 24
720045501
PCB IE 28
5129834
PCB IE 32
5129835
PCB IE 24 LPG
720045801
PCB IE 28 LPG
5129837
Pressure Gauge
248090
415
302
421
503
© Baxi Heating UK Ltd 2011
434
420
504
47
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18.0 Fault Finding
18.1
NOTE: When instructed to turn the
selector to the reset position turn the
selector switch fully anticlockwise against
the spring pressure to the reset position
and hold for 5 seconds to reset the
boiler.
Initial Fault Finding Checks
1. Check that gas, water and electrical supplies are available
at the boiler.
2. Electrical supply = 230V ~ 50 Hz.
3. CH water system pressurised to 0.5 bar minimum when
the boiler is cold.
4. The preferred minimum gas pressure is 20 mbar (NG) or
37mbar (LPG).
5. Carry out electrical system checks, i.e. Earth Continuity,
Resistance to Earth, Short Circuit and Polarity with a suitable
meter.
NOTE: These checks must be repeated after any
servicing or fault finding.
6. Ensure all external controls are calling for heat and check
all external and internal fuses. Before any servicing or
replacement of parts, ensure the gas and electrical supplies
are isolated.
18.2
Error Codes
1. If a fault occurs on the boiler an error code may be shown
by the facia display.
Table Of Error Codes
E20
E28
E110
E119
E125
E130
E133
E160
E193
Central Heating NTC Fault
Flue NTC Fault
Safety Thermostat Operated
Water Pressure Switch Not Operated
Circulation Fault (Primary Circuit)
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Fan or Fan Wiring Fault
Pre-Circulation Fault
2. The codes are either two or three digit, preceded by the
letter 'E'. For example, code E133 will be displayed by 'E1'
alternating with '33'. E20 is shown as 'E' then '20'
E20 and E28 indicate faulty components.
E110 shows overheat of the primary water and E130
overheat of the flue system.
E119 is displayed when the primary water pressure is less
than 0.5 bar.
E133 indicates that the gas supply has been interrupted,
ignition has failed or the flame has not been detected.
E125 is displayed in either of two situations:i) If within 15 seconds of the burner lighting the boiler
temperature has not changed by 1°.
ii) If within 10 minutes of the burner lighting the boiler
temperature twice exceeds the selected temperature by 30°.
In these instances poor primary circulation is indicated.
3. By turning the selector switch to the 'Reset' position for a
minimum of 5 seconds when E110, E130 & E133 are
displayed it is possible to relight the boiler.
4. If this does not have any effect, or the codes are displayed
regularly further investigation is required.
48
© Baxi Heating UK Ltd 2011
Supplied by HeatingSpares247.com
18.0 Fault Finding
Refer to Section 16.0 “Illustrated Wiring Diagram” for position of terminals and components
Central Heating - Follow operational sequence
Turn selector switch to
The display illuminates
NO
Go to section ‘A’
YES
Error 110 flashing
Error 130 flashing
Error 133 flashing
YES
Turn the selector switch to
reset position for 5 seconds
YES
If the error 110 is still flashing.
Go to section ‘I’
NO
Error 20, 28 or 50 flashing
YES
Go to section ‘E’
NO
YES
Error 119 flashing
Go to section ‘C’
Ensure controls are set to
demand and verify the
contacts are closed
NO
NO
Turn Central Heating
thermostat to Maximum.
Pump runs
NO
Ensure all controls and
integral clock are calling for
heat
YES
Go to section ‘B’
YES
Error E125 or E193 flashing
NO
Ensure that primary
circulation is OK & that
there is no blockage
YES
3-way valve is open to Central
Heating circuit
YES
Go to section ‘J’
NO
Fan runs
NO
Error 160 flashing
Go to section ‘D’
NO
Error 160 flashing
Go to section ‘L’
YES
Fan runs at correct speed
YES
Spark at ignition electrodes for
up to 5 seconds and for 3
attempts
YES
NO
Error 133 flashing
YES
Go to section ‘G’
Turn the selector switch to
reset
Go to section ‘F’
NO
YES
Burner lights
Burner does not stay alights
after 5 seconds
YES
Error 133 flashing
Go to section ‘H’
YES
Pump continues to run for 3
minutes
(room thermostat open)
Check the Central Heating
NTC sensor
Go to section ‘E’
YES
NO
Burner output modulates to
maintain the temperature set
Error 130 flashing
Go to section ‘K’
YES
Burner goes out
© Baxi Heating UK Ltd 2011
YES
Fan stops after 10 seconds
YES
Operation sequence
successful
49
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18.0 Fault Finding
Fault Finding Solutions Sections
A
Is there 230V at:
1.
Main terminals L and N
2.
Main terminal fuse
3.
B
NO
Check electrical supply
NO
Replace fuse
NO
Check wiring
PCB - X1 connector
terminals 1,2
NO
Display
illuminated
Is there 230V at:
YES
1.
Pump
2.
PCB - X3 connector terminals 3 & 4
NO
If pump jammed, release
NO
Replace pump
Replace PCB
YES
Change pump supply cable
C
1.
YES
CH system pressure less than 0.5 bar
NO
2.
D
1.
Check the tap of the automatic air
vent is opened
Fan connections correct at fan. PCB X2 connector, is 230V AC across
terminals 5 & 7
Re-pressurise system
Check connection water pressure
switch terminal
COM - NO and PCB connector
X400 terminals 3,4
NO
YES
Fan jammed or faulty winding
Replace PCB
© Baxi Heating UK Ltd 2011
Replace water
pressure switch
Open the automatic air vent
NO
50
YES
YES
Replace fan
Replace PCB
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18.0 Fault Finding
E
F
Temperature sensors faulty.
Cold resistance approximately
10kΩ @ 25° C (DHW and CH sensors)
20kΩ @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
1.
2.
NO
Replace sensor
Check and correct the connection of the
tube between the venturi and gas valve
Gas at burner
NO
Ensure gas is on and purged
PCB - X3 connector is 230V AC across
terminals 1 & 2
YES
Replace gas valve
NO
Replace PCB
YES
Voltage at PCB - X2 connector is
110V DC across terminals 2 & 5
(Note: from multimeter connect
‘common’ to 2 & ‘volts’ to 5)
Check wiring
Burner
NO
YES
Replace PCB
Replace igniter
4 ±0.5
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
Viewing Window
Sensing
Electrode
Spark Ignition
Electrode
±1
7.5
G
10 ±1
Electrode Position
© Baxi Heating UK Ltd 2011
51
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18.0 Fault Finding
H
1.
2.
Check the gas supply pressure:
Natural Gas minimum 17 mbar
Propane minimum 37 mbar
Check and correct if necessary
1. The mechanical set of the gas valve
(CO2 values - see instruction)
2. Flame sensing electrode and lead connections
3. Flame sensing electrode position
YES
Flame current should be more than 0.5 μ A
I
1.
Overheat thermostat operated or
faulty, i.e. continuity across
thermostat terminals
NO
NO
Replace PCB
Replace flame sensing electrode
Allow to cool. Continuity
across thermostat terminals
more than 1.5 ohm
YES
YES
Replace PCB
J
1.
K
1.
2.
52
Fan connections correct at fan.
PCB - X401 connector terminals 5,6,7 & 8
Temperature sensors faulty.
Cold resistance approximately
10kΩ @ 25° C (CH sensor)
20kΩ @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
YES
NO
YES
If pump is running the heat exchanger could be
obstructed
© Baxi Heating UK Ltd 2011
Replace fan
Replace sensor
Replace heat exchanger
Replace safety thermostat
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19.0 Notes
© Baxi Heating UK Ltd 2011
53
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1.0 Introduction
GAS BOILER COMMISSIONING CHECKLIST
BOILER SERIAL No.
CONTROLS
TIME & TEMPERATURE CONTROL TO HEATING
ROOM T/STAT & PROGRAMMER/TIMER
PROGRAMMABLE ROOMSTAT
CYLINDER T/STAT & PROGRAMMER/TIMER
COMBI BOILER
HEATING ZONE VALVES
FITTED
NOT REQUIRED
HOT WATER ZONE VALVES
FITTED
NOT REQUIRED
THERMOSTATIC RADIATOR VALVES
FITTED
AUTOMATIC BYPASS TO SYSTEM
FITTED
TIME & TEMPERATURE CONTROL TO HOT WATER
NOT REQUIRED
SYSTEM CLEANING
THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACTURER’S INSTRUCTIONS?
THE SYSTEM CLEANER USED
THE INHIBITOR USED
IN OPERATION MEASURE & RECORD
GAS RATE
m3/hr
ft3/hr
BURNER OPERATING PRESSURE (IF APPLICABLE)
N/A
mbar
CENTRAL HEATING FLOW TEMPERATURE
°C
CENTRAL HEATING RETURN TEMPERATURE
°C
CONFIRM THE FOLLOWING
THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS?
YES
THE HEATING AND HOT WATER SYSTEM COMPLIES
WITH CURRENT BUILDING REGULATIONS
THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMMISSIONED
IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS
IF REQUIRED BY THE MANUFACTURER, HAVE YOU RECORDED A CO/CO2 RATIO READING?
N/A
YES
CO/CO2 RATIO
THE OPERATION OF THE APPLIANCE AND SYSTEM
CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER
THE MANUFACTURER’S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER
COMMISSIONING ENG’S NAME PRINT
SIGN
1
54
© Baxi Heating UK Ltd 2011
ID No.
DATE
1
Supplied by HeatingSpares247.com
SERVICE INTERVAL RECORD
It is recommended that your heating system is serviced regularly
and that you complete the appropriate Service Interval Record Below.
Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service
as described in the boiler manufacturer’s instructions. Always use the manufacturer’s specified spare part when replacing all controls
SERVICE 1 DATE
SERVICE 2 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 3 DATE
SERVICE 4 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 5 DATE
SERVICE 6 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 7 DATE
SERVICE 8 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
SIGNATURE
SIGNATURE
SERVICE 9 DATE
SERVICE 10 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
COMPANY NAME
TEL No.
ENGINEER ID CARD SERIAL No.
COMMENTS
55
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Contact us
For general enquiries contact branches nationwide
For technical advice please contact
056 7720 023
For in warranty service contact
090 6424 062
Branches Nationwide
www.heatmerchants.ie
For technical enquiries please contact
warrantyapp@heatmerchants.ie
All descriptions and illustrations provided in this leaflet have been carefully
prepared but we reserve the right to make changes and improvements in
our products which may affect the accuracy of the information contained in
this leaflet. All goods are sold subject to our standard Conditions of Sale
which are available on request.
BAXI
A Tr a d in g D i v i s i o n o f B ax i H eat i ng U K Lt d ( 3879156) ,
Brooks House, Coventry Road, Warwick. CV34 4LL
Website www.baxi.co.uk
e&oe
© Baxi Heating UK Ltd 2011
UK Comp No 5129838 - Iss 7 - 3/11