Installation & Servicing Instructions
Neta-tec Combi GA Range
Gas Fired Wall Mounted Condensing
Combination Boiler
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
They must be read in conjunction with the Flue Installation Guide.
© Baxi Heating UK Ltd 2014
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Model Range
Baxi Neta-tec Combi 24 GA
G.C.No 47-075-51
Baxi Neta-tec Combi 28 GA
G.C.No 47-075-52
Baxi Neta-tec Combi 33 GA
G.C.No 47-075-53
Building Regulations and the Benchmark Commissioning
Checklist
Building Regulations (England & Wales) require notification of
the installation of a heating appliance to the relevant Local
Authority Building Control Department. This can be achieved
via a Competent Persons Self Certification Scheme as an
option to notifying the Local Authority directly.
The Health & Safety Executive operates the ‘Gas Safe Register’,
a self-certification scheme for gas heating appliances.
The Benchmark Scheme
Benchmark places responsibilities on both manufacturers and installers. The
purpose is to ensure that customers are provided with the correct equipment for
their needs, that it is installed, commissioned and serviced in accordance with the
manufacturer’s instructions by competent persons and that it meets the
requirements of the appropriate Building Regulations. The Benchmark Checklist
can be used to demonstrate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work
in accordance with the Benchmark Code of Practice which is available from the
Heating and Hotwater Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
© Baxi Heating UK Ltd 2014 All rights reserved. No part of this publication may
be reproduced or transmitted in any form or by any means, or stored in any
retrieval system of any nature (including in any database), in each case whether
electronic, mechanical, recording or otherwise, without the prior written
permission of the copyright owner, except for permitted fair dealing under
Copyrights, Designs and Patents Act 1988.
Applications for the copyright owner’s permission to reproduce or make other
use of any part of this publication should be made, giving details of the proposed
use, to the following address:
The Company Secretary, Baxi Heating UK Limited,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
These arrangements represent a change from the situation
whereby compliance with Building Regulations was accepted as
being demonstrated by completion of the Benchmark Logbook
(which was then left on site with the customer).
With the introduction of Self Certification Schemes, the
Benchmark Logbook is being withdrawn. However, a similar
document in the form of a commissioning checklist and service
interval record is incorporated at the back of these instructions.
This company is a member of the Benchmark initiative and fully
supports the aims of the programme. Its aim is to improve the
standards of installation and commissioning of central heating
systems in the UK and to encourage the regular servicing of all
central heating systems to ensure safety and efficiency.
Building Regulations require that installations should comply
with manufacturer's instructions. It is therefore important that
the commissioning checklist is completed by the installer. The
relevant section of Building Regulations only relates to
dwellings. Therefore the checklist only applies if the appliance is
being installed in a dwelling or some related structure.
The flowchart opposite gives guidance for installers on the
process necessary to ensure compliance with Building
Regulations.
WARNING: Any person who does any unauthorised act in relation to a
copyright work may be liable to criminal prosecution and civil claims for damages.
0086
ISO 9001
FM 00866
2
© Baxi Heating UK Ltd 2014
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Installer Notification Guidelines
Choose Building
Regulations Notification
Route
Competent Person's
Self Certification Scheme
Building Control
Install and Commission this
appliance to manufacturer's
instructions
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
Complete the
Benchmark Checklist
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Install and Commission this
appliance to manufacturer's
instructions
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
Complete the
Benchmark Checklist
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
LABC will record the data
and will issue a
certificate of compliance
© Baxi Heating UK Ltd 2014
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3
Legislation
IMPORTANT - Installation, Commissioning, Service & Repair
This appliance must be installed in accordance with the manufacturer’s instructions and
the regulations in force. Read the instructions fully before installing or using the
appliance.
In GB, this must be carried out by a competent person as stated in the Gas Safety
(Installation & Use) Regulations.
Definition of competence: A person who works for a Gas Safe registered company
and holding current certificates in the relevant ACS modules, is deemed competent.
In IE, this must be carried out by a competent person as stated in I.S. 813 “Domestic
Gas Installations”.
The addition of anything that may interfere with the normal operation of the appliance
without express written permission from the manufacturer or his agent could invalidate
the appliance warranty. In GB this could also infringe the Gas Safety (Installation and
Use) Regulations.
Warning - Check the information on the data plate is compatible with local supply
conditions.
This company declare that no substances harmful to health
are contained in the appliance or used during appliance
manufacture.
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force, and
only used in a suitably ventilated location.
In GB, the installation must be carried out by a Gas Safe
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
• Gas Safety (Installation & Use) Regulations.
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current edition of
I.S. 813 ‘Domestic Gas Installations’, the current Building
Regulations and reference should be made to the current ETCI
rules for electrical installation.
All Gas Safe registered engineers carry an ID card with their licence number and a
photograph. You can check your engineer is registered by telephoning
0800 408 5500 or online at www.gassaferegister.co.uk
All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)
Regulations 1993 No 3083” and is deemed to meet the requirements of Directive
92/42/EEC on the energy efficiency requirements for new hot water boilers fired with
liquid or gaseous fuels:-
Codes of Practice - refer to the most recent version
Type test for purpose of Regulation 5 certified by:
Notified Body 0085.
Product/Production certified by:
Notified Body 0086.
For GB/IE only.
In GB the following Codes of Practice apply:
Standard
Scope
BS 6891
Gas Installation.
BS 5482 Part 1
Butane & Propane Gas Installation
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 12831
Heating systems in buildings - Calculation of load.
BS EN 14336
Installation & commissioning of water based
heating systems.
BS 6798
Installation of gas fired hot water boilers.
BS 5440 Part 1
Flues.
BS 5440 Part 2
Ventilation.
BS 7074
Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
In IE the following Codes of Practice apply:
Standard
Scope
I.S. 813
Domestic Gas Installations.
The following standards give valuable additional information;
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 12831
Heating systems in buildings - Calculation of load.
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.
4
© Baxi Heating UK Ltd 2014
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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 !!
© Baxi Heating UK Ltd 2014
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5
CONTENTS
Section
6
Page
1.0
Introduction
7
2.0
General Layout
8
3.0
Appliance Operation
9
4.0
Technical Data
10
5.0
Dimensions and Fixings
11
6.0
System Details
12
7.0
Site Requirements
15
8.0
Flue Options
20
9.0
Installation
22
10.0
Commissioning
27
11.0
Completion & System Draining
30
12.0
Servicing
31
13.0
Changing Components
33
14.0
Combustion & Calibration
42
15.0
Electrical
43
16.0
Short Parts List
44
17.0
Fault Finding & ‘Service Due’
45
18.0
Optional Outdoor Sensors
51
Benchmark Checklist
54
© Baxi Heating UK Ltd 2014
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1.0 Introduction
1.1
Description
1. The Baxi Neta-tec Combi GA Range are fully automatic gas
fired wall mounted condensing combination boilers. They are
room sealed and fan assisted, and will serve central heating and
mains fed domestic hot water.
2. The boiler is set to give a maximum output of :24 models - 24 kW DHW
21.2 kW CH (Condensing)
28 models - 28 kW DHW
25.3 kW CH (Condensing)
33 models - 33 kW DHW
29.6 kW CH (Condensing)
Information Label
3. The boiler is factory set for use on Natural Gas (G20). It can
be adapted to operate on Propane (G31) - see Section 10.1
‘Gas Type Check’.
4. The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.
Control Flap
Fig. 1
5. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the control
box. It is visible when the case front panel is removed (Fig. 2).
6. The boiler model, serial number and Gas Council number are
also shown on the information label behind the boiler control
flap (Fig. 1). This is for user reference.
7. The boiler is intended to be installed in residential / domestic
environments on a governed meter supply only.
8. The boiler must be installed with one of the purpose
designed flues such as one of the standard horizontal telescopic
flue kits detailed in the Flue Installation Guide.
9. All systems must be thoroughly cleansed, flushed and
treated with inhibitor (see section 6.2).
1.2
Optional Extras
Various timers, external controls, etc. are available as optional
extras. Full details are contained in the relevant sales literature.
1.3
Gas Type Label
Data Badge
Fig. 2
Contents of Pack
The pack contains:• Boiler
• Wall Plate (including taps)
• Template
• Fittings & Literature Pack
NOTE: These Installation & Servicing Instructions MUST be
read in conjunction with the Flue Installation Guide supplied
in the Literature Pack.
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7
2.0 General Layout
2.1
2
3
Layout
8
1
12
11
10
9
7
13
15
17
1.
Expansion Vessel
2.
Boiler Adaptor
3.
Primary Heat Exchanger
4.
DHW Plate Heat Exchanger
5.
Pump with Automatic Air Vent
6.
Central Heating System Pressure Gauge
7.
Fan Assembly
8.
Exp. Vessel Locating Stud
9.
Flame Sensing Electrode
10.
Air/Gas Collector
11.
Spark Ignition Electrode
12.
Combustion Box Cover & Burner
13.
Control Box Display
14.
Condensate Trap
15.
Safety Pressure Relief Valve
16.
Gas Valve
17.
Diverter Valve Motor
18.
Boiler Control
19.
Optional Timer
20.
Boiler Drain Tap
21.
Heating Flow Sensor
22.
Safety Thermostat
4
19
18
21
22
6
5
16
14
20
8
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Boiler Schematic
Layout
19
3.0 Appliance Operation
3.1
20
18
1. With a demand for heating, the pump circulates water
through the primary circuit.
21
2. Once the burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
temperature sensor.
22
3. When the flow temperature exceeds the setting
temperature, a 3 minute delay occurs before the burner
relights automatically (anti-cycling). The pump continues to
run during this period.
23
24
4. When the demand is satisfied the burner is extinguished
and the pump continues to run for a period of 3 minutes
(Pump Overrun).
25
26
28
3.2
27
17
Domestic Hot Water Mode
1. Priority is given to the domestic hot water supply. A
demand at a tap or shower will override any central heating
requirement.
16
2. The flow of water will operate the Domestic Hot Water
Sensor (‘Hall Effect Sensor’) which requests the 3 way valve
to change position. This will allow the pump to circulate the
primary water through the DHW plate heat exchanger.
15
13
3. The burner will light automatically and the temperature of
the domestic hot water is controlled by the temperature
sensor.
1
2
14
M
7
8
12
6
10
A
Central Heating Mode
11
B
4
5
9
C
D
E
F
Fig. 3
Key
1. Pump with Automatic Air Vent
2. Diverter Valve Assembly
3. Diverter Valve motor
4. CH System Pressure Gauge
5. Central Heating Filter
6. Domestic Hot Water Filter
7. Domestic Hot Water Priority Sensor
(‘Hall Effect Sensor’)
8. Domestic Hot Water NTC sensor
9. Non-return Valve
10. Hydraulic Pressure Sensor
11. Boiler Drain Tap
12. Pressure Relief Valve
13. Plate Heat Exchanger
14. Condensate Trap
15. Gas Valve
16. Safety Thermostat (105°C)
17. Heating Flow Sensor
18. Flue Sensor
19. Boiler Adaptor
20. Primary Heat Exchanger
21. Spark Ignition Electrode
22. Burner
23. Flame Sensing Electrode
24. Air/Gas Collector
25. Return Heating Sensor
26. Fan
27. Air/Gas Venturi
28. Expansion Vessel
Connections:A – Condensate Drain
B – Heating Flow
C – Domestic Hot Water Outlet
D – Gas Inlet
E – Cold Water Inlet On/Off Valve and filter
F – Heating Return
3
4. When the domestic hot water demand ceases the burner
will extinguish and the diverter valve will remain in the
domestic hot water mode, unless there is a demand for
central heating.
3.3
Boiler Frost Protection Mode
1. The frost protection mode is integral to the appliance and
functions as long as there is power to the boiler, as indicated
by the standby signal
.
2. With CH & DHW or CH only selected, when the boiler
temperature falls below 5°C the boiler will fire until a
temperature of 30°C is reached.
3. If DHW only is selected, when the boiler CH temperature
falls below 5°C the boiler will fire until a temperature of
30°C is reached. When the boiler DHW temperature falls
below 5°C the boiler will fire until a temperature of 7°C is
reached.
4. Further protection can be incorporated by using a system
frost thermostat.
3.4
Pump Protection
1. If the boiler has been inactive for a period of 24 hours the
pump will automatically operate for 1 minute to prevent
sticking.
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9
4.0 Technical Data
4.1
Appliance Type
C13 C33 C43 C53
Appliance Category
CAT II 2H 3P
Heat Input CH (Net)
24 model
kW
28 model
kW
33 model
kW
Max
20
24
28
Heat Output CH (Non-Condensing)
Max
24 model
kW
20
28 model
kW
24
33 model
kW
28
Heat Output CH (Condensing)
Max
24 model
kW
21.2
28 model
kW
25.3
33 model
kW
29.6
Heat Input DHW (Net)
24 model
kW
28 model
kW
33 model
kW
Max
24.7
28.9
34
Heat Output DHW
24 model
kW
28 model
kW
33 model
kW
Max
24
28
33
Injector
24 model
28 model
33 model
4.4
4.6
4.9
mm
mm
mm
Min
3.5
3.9
4.8
Min
3.4
3.8
4.7
Min
3.7
4.1
5.1
NOx Class
Electrical Protection
IPX5D
3A
Internal Fuse Rating
F2L
Diameter
Projection
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
Max Gas Rate
Packaged Boiler Carton
Installation Lift Weight
PROPANE ONLY !
Max Gas Rate
24 model
28 model
33 model
(Propane - G31)
(After 10 mins)
kg/h
1.92
kg/h
2.25
kg/h
2.64
Inlet Pressure (Propane - G31)
mbar
37
Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption
24 model
W
28 model
W
33 model
W
104
116
133
DHW Circuit
Pressures
Max Operating
Min Operating
copper tails
22mm
22mm
22mm
15mm
15mm
15mm
-
Packaged Boiler Carton
Installation Lift Weight
Packaged Boiler Carton
Installation Lift Weight
bar
8
0.15
Flow Rates
700mm
860mm
390mm
300mm
(24) (28) (33)
l/min l/min l/min
DHW Flow Rate
@ 30o C Rise
10.9
12.9
15.3
DHW Flow Rate
@ 35o C Rise
9.8
11.5
13.5
Min Working
DHW Flow Rate
2
2
2
IMPORTANT: Where Low Flow Taps or Fittings are
intended to be used in the DHW system connected it is
strongly recommended that the DHW flow rate DOES
NOT fall below 2.5l/min. This will ensure reliable
operation of the DHW function.
Expansion Vessel
- (For Central Heating only.
Integral with appliance)
bar
Min Pre-charge Pressure
0.5
(24 model)
38.5kg
34 kg
(28 model)
38.5kg
34 kg
(33 model)
40.5kg
36kg
(24 & 28)
litre
(33)
litre
Max Capacity of
CH System
100
100
Primary Water Content
of Boiler (unpressurised)
2.5
2.8
Temperatures
C.H. Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
D.H.W. Flow Temp (adjustable)
35°C to 60°C max (± 5°C)
dependent upon flow rate
SEDBUK Declaration
SAP 2005 Seasonal Efficiency for N. G.
models is 91.1%
SAP 2005 Seasonal Efficiency for L.P.G.
models is 93.2%
SAP 2009 Annual Efficiency for N. G.
models is 89%
SAP 2009 Annual Efficiency for L.P.G.
models is 91%
Pump
Available Head
See graph below
Pump - Available Head
6
5.5
5
This value is used in the UK Government’s Standard
4.5
Assessment Procedure (SAP) for energy rating of
4
dwellings. The test data from which it has been calculated
3.5
has been certified by 0087.
3
Metre (wg)
Inlet Pressure (Natural Gas - G20)
mbar
20
100mm
125mm
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
Weights
24 model
28 model
33 model
-
bar
3
2.5
0.5
1-2
Safety Discharge
Max Operating
Min Operating
Recommended Operating Range
175mm Min
150mm Min*
450mm Min (For Servicing)
5mm Min (In Operation)
5mm Min
5mm Min :
NATURAL GAS ONLY !
(Natural Gas - G20)
(After 10 mins)
2.54
m3/h
m3/h
2.96
3.49
m3/h
Central Heating Primary Circuit
Pressures
Condensate Drain
To accept 21.5mm (3/4 in) plastic waste pipe
Connections
Gas Inlet
Heating Flow
Heating Return
Cold Water Inlet
Hot Water Outlet
Pressure Relief Discharge
N.G. 9.0% ± 0.7
L.P.G. 10.5% ± 1.0
CO2
External Fuse Rating
Flue Terminal
Dimensions
5
2.5
2
1.5
NOTE: All data in this section are nominal values
and subject to normal production tolerances.
1
0.5
0
10
0
© Baxi Heating UK Ltd 2014
200
400
600
800
1000
Flow Rate (l/h)
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1200
5.0 Dimensions and Fixings
Dimensions
At least 1.5°
E
G
A 700mm
B 300mm*
*This can be reduced to 290mm by
removing the boiler control access flap
C 390mm
A
D 116mm Ø Min.
E 160mm
(207mm for 80/125mm
flue systems)
F 130mm
B
360° Orientation
G 106mm
H 228mm
H
D
J
C
162mm
J
Flue Ø 100mm
F
Tap Rail
Boiler
Side
Boiler
Side
Condensate
Drain
Pressure
Relief
Valve
(15mm)
25
40 mm mm
65 mm
65 mm
65 mm
65 mm
65 mm
162,5 mm
Heating
Flow
(22mm)
Hot Water
Outlet
(15mm)
Gas
Inlet
(22mm)
Cold Water
Inlet
(15mm)
Heating
Return
(22mm)
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11
6.0 System Details
6.1
Information
1. The Baxi Neta-tec Combi GA Condensing Combination Boiler
is a ‘Water Byelaws Scheme - Approved Product’.
To comply with the Water Byelaws your attention is drawn to
the following installation requirements and notes (IRN).
a) IRN 001 See text of entry for installation
requirements and notes.
b) IRN 302 Byelaw 14.
2. Reference to the WRc publications, ‘Water fittings and
materials directory’ and ‘Water supply byelaws guide’ give full
details of byelaws and the IRNs.
6.2
Treatment of Water Circulating Systems
1. All recirculatory water systems will be subject to corrosion
unless they are flushed and an appropriate water treatment is
applied. To prevent this, follow the guidelines given in BS
7593 “Treatment of Water in Domestic Hot Water Central
Heating Systems” and the treatment manufacturers
instructions.
2. Treatment must involve the use of a proprietary cleanser,
such as Sentinel X300 or X400, or Fernox F3 and an inhibitor
such as Sentinel X100 or Fernox MB-1.
3. Full instructions are supplied with the products, for further
information contact Sentinel (0800 389 4670) or Fernox
(0870 870 0362).
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.
4. It is important to check the inhibitor concentration after
installation, system modification and at every service in
accordance with the inhibitor manufacturer’s instructions.
(Test kits are available from inhibitor stockists.)
5. For information or advice regarding any of the above
contact Technical Enquiries 0844 871 1555.
6.3
Bypass
1. The boiler is fitted with an automatic integral bypass. Some
systems may require an additional external bypass.
6.4
System Control
1. Further external controls (e.g. room thermostat sensors)
MUST be fitted to optimise the economical operation of the
boiler in accordance with Part L of the Building Regulations
(2010). A range of optional controls are available. Full details
are contained in the relevant Sales Literature.
12
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6.0 System Details
6.5
Stop
Valve
Double
Check
Valve
System Filling and Pressurising
1. A filling point connection on the central heating return
pipework must be provided to facilitate initial filling and
pressurising and also any subsequent water loss
replacement/refilling.
Stop
Valve
2. A filling loop is supplied with the boiler. Follow the
instructions provided with it.
DHW
Mains
Inlet
Temporary
Loop
CH
Return
3. The filling method adopted must be in accordance with all
relevant water supply regulations and use approved equipment.
Fig. 4
4. Your attention is drawn to:
for GB: Guidance G24.2 and recommendation R24.2 of the
Water Regulations Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
5. The sealed primary circuits may be filled or replenished by
means of a temporary connection between the circuit and a
supply pipe, provided a ‘Listed’ double check valve or some
other no less effective backflow prevention device is
permanently connected at the inlet to the circuit and the
temporary connection is removed after use.
6.6
Fig. 5
Filling Loop
Connections
Expansion Vessel (Central Heating only)
1. The appliance expansion vessel is pre-charged to 0.5 bar.
Therefore, the minimum cold fill pressure is 0.5 bar. The vessel
is suitable for correct operation for system capacities up to 125
litres (24/28) or 155 litres (33). For greater system capacities an
additional expansion vessel must be fitted. For GB refer to BS
7074 Pt 1. For IE, the current edition of I.S. 813 “Domestic Gas
Installations”.
6.7
Safety Pressure Relief Valve (Fig. 6)
1. The pressure relief valve is set at 3 bar, therefore all
pipework, fittings, etc. should be suitable for pressures in excess
of 3 bar and temperature in excess of 100°C.
The end of the pipe should
terminate facing down and
towards the wall
2. The pressure relief discharge pipe should be not less than
15mm dia, run continuously downward, and discharge outside
the building, preferably over a drain. It should be routed in such
a manner that no hazard occurs to occupants or causes damage
to wiring or electrical components. The end of the pipe should
terminate facing down and towards the wall (Fig. 6a).
Fig. 6a
3. The discharge must not be above a window, entrance or
other public access. Consideration must be given to the
possibility that boiling water/steam could discharge from the
pipe.
Control Box removed
for clarity
Fig. 6
Pressure Relief Valve
Discharge Pipe
4. A remote relief valve kit is available to enable the boiler to be
installed in cellars or similar locations below outside ground
level (kit no. 5121379).
5. A boiler discharge pump is available, part no. 720648301.
This pump will dispose of both condensate & high temperature
water from the relief valve. It has a maximum head of 5 metres.
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13
6.0 System Details
6.8
Domestic Hot Water Circuit (Fig. 7)
1. All DHW circuits, connections, fittings, etc. should be fully
in accordance with relevant standards and water supply
regulations.
Other Tap
Outlets
Expansion
Vessel*
Boiler
Check
Valve*
Pressure Reducer
Valve*
To Hot
Taps
Stop Tap
*See 6.8 for instances when
these items may be required
Fig. 7
IMPORTANT: Where Low Flow Taps or
Fittings are intended to be used in the DHW
system connected to a Baxi Neta-tec Combi GA
it is strongly recommended that the DHW flow
rate DOES NOT fall below 2.5l/min. This will
ensure reliable operation of the DHW function.
2. Your attention is drawn to:
for GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulations Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
3. The Water Regulations recommendations for England and
Wales prohibits backflow from appliances into the
wholesome water supply due to thermal expansion.
However this type of instantaneous combination boiler, with
less than 15 litres of stored capacity, does not require any
backflow prevention device as any thermal expansion is
accommodated within the appliance.
It is possible in certain circumstances that other cold water
demands (e.g. washing machines, flushing of W.C.s) may
affect the DHW function of the boiler. In these instances the
fitting of a backflow prevention device and expansion vessel
is recommended.
4. Also if there is an existing check valve, loose jumpered
stop cock, water meter or water treatment device already
fitted to the wholesome water supply connected to the
boiler domestic hot water (DHW) inlet supply then a
suitable expansion device may be required.
5. The boiler’s maximum working mains pressure is 8 bar,
therefore all pipework, connections, fittings, etc. should be
suitable for pressures in excess of 8 bar. A pressure reducing
valve must be fitted for pressures in excess of 8 bar. The
manufacturer of any outlet fittings, such as a shower valve,
may require a lower maximum pressure. The pressure
reduction must take account of all fittings connected to the
DHW system.
6.9
Showers
1. If a shower control is supplied from the appliance it
should be of the thermostatic or pressure balanced type.
Thermostatic type shower valves provide the best comfort
and guard against water at too high a temperature. Existing
controls may not be suitable - refer to the shower valve
manufacturer.
6.10
Hard Water Areas
1. If the area of the installation is recognised as a HARD
WATER AREA then a suitable device should be fitted to
treat the mains water supply to the boiler. Contact your
Water Distribution Company for advice on suitable devices.
14
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390mm
5mm Min
7.0 Site Requirements
5mm Min
7.1
175mm Min
(300mm Min if
using 80/125mm
flueing system)
Location
1. The boiler may be fitted to any suitable wall with the flue
passing through an outside wall or roof and discharging to
atmosphere in a position permitting satisfactory removal of
combustion products and providing an adequate air supply.
The boiler should be fitted within the building unless
otherwise protected by a suitable enclosure i.e. garage or
outhouse. (The boiler may be fitted inside a cupboard-see
Section 7.3).
2. Where the boiler is sited in an unheated enclosure and
during periods when the heating system is to be unused it is
recommended that the permanent live is left on to give
BOILER frost protection. NOTE: THIS WILL NOT PROTECT
THE SYSTEM !
700mm
3. If the boiler is fitted in a room containing a bath or shower
reference must be made to the relevant requirements.
In GB this is the current I.E.E. Wiring Regulations and Building
Regulations.
In IE reference should be made to the current edition of I.S.
813 “Domestic Gas Installations” and the current ETCI rules.
4. If the boiler is to be fitted into a building of timber frame
construction then reference must be made to the current
edition of Institute of Gas Engineers Publication IGE/UP/7
(Gas Installations in Timber Framed Housing).
Fig. 8
150mm* Min
7.2
Clearances (Figs. 8 & 9)
1. A flat vertical area is required for the installation of the
boiler.
At least 1.5°
2. These dimensions include the necessary clearances around
the boiler for case removal, spanner access and air
movement. Additional clearances may be required for the
passage of pipes around local obstructions such as joists
running parallel to the front face of the boiler.
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
7.3
450mm Min
Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required.
For Servicing
Purposes
2. BS 5440: Part 2 refers to room sealed appliances installed
in compartments. The appliance will run sufficiently cool
without ventilation.
5mm Min
300mm
In Operation
(290mm with flap removed)
Fig. 9
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15
7.0 Site Requirement
7.4
Gas Supply
1. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891 (NG) or BS 5482
Pt. 1 (LPG). In IE this is the current edition of I.S. 813
“Domestic Gas Installations”.
2. The connection to the appliance is a 22mm copper tail
located at the rear of the gas service cock (Fig. 10).
3. Ensure that the pipework from the meter to the
appliance is of adequate size, and the demands of any
other gas appliances in the property are taken into
consideration. Do not use pipes of a smaller diameter than
the boiler gas connection (22mm).
7.5
Gas Service Cock
Electrical Supply
1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In GB this is
the current I.E.E. Wiring Regulations. In IE reference should
be made to the current edition of ETCI rules.
Fig. 10
Zone 2
2. The mains supply is 230V ~ 50Hz fused at 3A.
Window
Recess
NOTE: The method of connection to the electricity
supply must facilitate complete electrical isolation of the
appliance.
Zone 1
Zone 2
Zone 0
Connection may be via a fused double-pole isolator
with a contact separation of at least 3mm in all poles
and servicing the boiler and system controls only.
0.6 m
Window
Recess
Zone 2
Fig. A
7.6
In GB Only
Ceiling
Window Recess
Zone 2
Zone 1
Zone 2
Outside Zones
Bath & Shower Rooms
1. If the boiler is fitted in a room containing a bath or
shower it can be fitted in zone 2, (Figs. A & B shows zone
dimensions for a bathtub. For other examples refer to the
Current I.E.E. Wiring Regulations) reference must be made
to the relevant requirements.
In GB this is the current I.E.E. Wiring Regulations and
Building Regulations.
In IE reference should be made to the current edition of I.S.
813 “Domestic Gas Installations” and the current ETCI
rules.
2.25 m
Zone 0
0.6 m
Fig. B
16
In GB Only
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Examples are shown of the following methods of termination:i) to an internal soil & vent pipe
ii) via an internal discharge branch (e.g. sink waste) downstream of the trap
iii) to a drain or gully
iv) to a purpose made soakaway
v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap
vi) pumped into an external soil & vent pipe
vii) to a drain or gully with extended external run & trace heating
It is strongly recommended to discharge internally into the household
drainage system. If connecting to a rain water drain, that drain MUST
discharge into a foul drain.
Insulation
32mm
21.5mm
i) Termination to an internal soil and
vent pipe
50mm
2.5° M
per me
inimum
tre of
fall
n
*450mm is applicable to properties
up to 3 storeys.
For multi-storey building installations
consult BS 6798.
Sink
ii) External termination via internal discharge branch
e.g sink waste - downstream*
50mm
per me
tre of
2.5° M
inimum
pipe ru
n
fall
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
*It is NOT RECOMMENDED
to connect upstream of the
sink or other waste water
receptacle !
Boiler
iii) Termination to a drain or gully
50mm
per me
tre of
2.5° M
inimum
pipe ru
n
7.7
Condensate Drain
FAILURE TO INSTALL THE CONDENSATE DISCHARGE
PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE
OPERATION OF THE BOILER.
CAREFUL CONSIDERATION MUST BE GIVEN TO THE
POSSIBILITY OF THE PIPEWORK BEING SUBJECT TO
FREEZING CONDITIONS AND APPROPRIATE
MEASURES TAKEN TO PREVENT BLOCKAGE.
CORRECT INSTALLATION IN ACCORDANCE WITH
THIS SECTION WILL CONSIDERABLY MINIMISE THE
LIKELIHOOD OF BLOCKAGE AND SUBSEQUENT
BOILER LOCK-OUT.
A CONDENSATE DISCHARGE PUMP AND PIPE ‘TRACE
HEATING’ ARE AVAILABLE AS ACCESSORIES - see
paragraphs 7.7.12 to 7.715 for further details.
The condensate discharge pipe MUST NOT RISE at any
point along its length. There MUST be a fall of AT LEAST
2.5° (50mm per metre) along the entire run EXCEPT when
employing a suitable condensate pump in basement and
cellar or similar applications.
pipe ru
450mm min*
Boiler
7.0 Site Requirements
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
fall
The boiler condensate trap incorporates a seal of 75mm,
therefore it is unnecessary to install an air break and trap in
the discharge pipework.
1. The condensate outlet will accept 21.5mm (3/4in) plastic
overflow pipe. It is strongly recommended that this discharges
internally into the household drainage system.
Where this is not possible, discharge into an outside drain is
permissible providing every possible precaution is taken to
prevent freezing.
2. Ensure the discharge of condensate complies with any
national or local regulations in force. BS 6798 & Part H1 of the
Building Regulations give further detailed guidance.
3. The discharge pipe should be run in a proprietary drain pipe
material e.g. PVC, PVC-U, ABS, PVC-C or PP.
4. Metal pipework is NOT suitable for use in condensate
discharge systems.
5. The pipe should be a minimum of 21.5mm diameter and
must be supported using suitably spaced clips of the correct
design to prevent sagging.
6. It is advisable that the full length of condensate pipe is run
internally and preferably be less than 3 metres.
7. Internal runs greater than 3 metres or runs in cold areas
should use 32mm waste pipe.
8. External runs MUST be a MINIMUM of 32mm and fully
insulated with material suitable for external use.
iv) Termination to a purpose made soakaway
Further specific requirements for soakaway
design are referred to in BS 6798.
Boiler
500mm min
50mm p
er metr
e of pip
2.5° Min
imum fa
e run
ll
Holes in the soak-away must
face away from the building
9. If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an external run
and sized and insulated accordingly.
10. In all cases discharge pipe must be installed to aid disposal of
the condensate. To reduce the risk of condensate being
trapped, as few bends and fittings as possible should be used
and any burrs on cut pipe removed.
11. When discharging condensate into a soil stack or waste pipe
the effects of existing plumbing must be considered. If soil pipes
or waste pipes are subjected to internal pressure fluctuations
when WC's are flushed or sinks emptied then back-pressure
may force water out of the boiler trap and cause appliance
lockout.
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17
v) pumped into an internal discharge branch
(e.g. sink waste) downstream of the trap
Sink
50mm
7.0 Site Requirements
per me
tre of p
ipe run
2.5° M
inimum
fall
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
7.7
Condensate Drain (cont.)
12. A boiler discharge pump is available, ‘MULTIFIT’
part no. 720648301. This pump will dispose of both
condensate & high temperature water from the relief valve.
It has a maximum head of 5 metres. Follow the instructions
supplied with the pump.
13. Condensate Drain Pipe ‘Trace Heating’ Elements are
available in various lengths. ‘MULTIFIT’ part nos.:-
Basement or similar
(heated)
1 metre 720644401
2 metre 720664101
3 metre 720664201
5 metre 720664401*
Boiler
*Where the drain is between 3 & 5 metres a 5 metre kit can
be used and “doubled back” upon itself.
14. It is possible to fit the element externally on the
condensate drain or internally as detailed in the instructions
provided.
Condensate Pump
15. The fitting of a ‘Trace Heating’ Element is NOT a
substitute for correct installation of the condensate drain.
ALL requirements in this section must still be adhered to.
vi) pumped into an external soil & vent pipe
50mm
Unheated Location
(e.g. Garage)
per me
tre of p
ipe run
2.5° M
inimum
fall
Basement or similar
(heated)
vii) to a drain or gully with extended
external run & trace heating
Boiler
The ‘Trace Heating’ element
must be installed in accordance
with the instructions supplied.
External runs & those in
unheated locations still require
insulation.
Boiler
Condensate Pump
50mm
per me
tre of
2.5° M
inimum
18
pipe ru
n
fall
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
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Terminal Position with Minimum Distance (Fig. 12)
(mm)
A1 Directly below an opening, air brick, opening
windows, etc.
B1 Above an opening, air brick, opening window etc.
C1 Horizontally to an opening, air brick, opening window etc.
D2 Below gutters, soil pipes or drain pipes.
E2 Below eaves.
F2 Below balconies or car port roof.
G2 From a vertical drain pipe or soil pipe.
H2 From an internal or external corner.
I
Above ground, roof or balcony level.
J
From a surface or boundary line facing a terminal.
K From a terminal facing a terminal (Horizontal flue).
From a terminal facing a terminal (Vertical flue).
L From an opening in carport (e.g. door, window)
into the dwelling.
M Vertically from a terminal on the same wall.
N Horizontally from a terminal on the same wall.
R From adjacent wall to flue (vertical only).
S From an adjacent opening window (vertical only).
T Adjacent to windows or openings on pitched and flat roofs
U Below windows or openings on pitched roofs
7.0 Site Requirements
300
300
300
25 (75)
25 (200)
25 (200)
25 (150)
25 (300)
300
600
1200
600
7.8
NOTE: Due to the nature of the boiler a plume of water
vapour will be discharged from the flue. This should be
taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements
for siting balanced flue terminals. For GB recommendations
are given in BS 5440 Pt 1. For IE recommendations are given
in the current edition of I.S. 813 “Domestic Gas
Installations”.
1200
1500
300
300
1000
600
2000
2. If the terminal discharges onto a pathway or passageway,
check that combustion products will not cause a nuisance
and that the terminal will not obstruct the passageway.
1 In addition, the terminal should be no nearer than 150 mm to an opening in the
3. If a terminal is less than 2 metres above a balcony, above
ground or above a flat roof to which people have access,
then a suitable terminal guard must be provided.
building fabric formed for the purpose of accommodating a built-in element such as
a window frame.
2 Only ONE 25mm clearance is allowed per installation. If one of the dimensions
IMPORTANT:
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.
D, E, F, G or H is 25mm then the remainder MUST be as shown in brackets, in
accordance with B.S.5440-1.
NOTE: The distance from a fanned draught appliance terminal
installed parallel to a boundary may not be less than 300mm in
accordance with the diagram below
300 min
Terminal
Assembly
Flue
*4. Reduction to the boundary is possible down to 25mm by
using the available flue deflector.
*
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
Fig. 13).
Top View Rear Flue
Fig. 11
Property Boundary Line
J,K
T
Air Inlet
U
Opening Window
or Door
150mm
MIN.
N
R
I
M
C
I
I
F
D
E
A
S
I
F
J,K
B
L
G
A
A
H
Fig. 13
H
I
Likely flue positions requiring
a flue terminal guard
Fig. 12
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19
8.0 Flue Options
8.1
Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
termination applications.
(ii)
(i)
2. All fittings should be fully engaged. The approximate
engagement is 40mm. Apply the lubricant supplied to the
seal on each fitting to aid assembly.
3. Maximum permissible equivalent flue lengths are:(60/100)
(80/125)
Horizontal Concentric 10 metres
20 metres
4. Any additional “in line” bends in the flue system must be
taken into consideration.
Their equivalent lengths are:Concentric Pipes:
135° bend
0.5 metres
93° bend
1.0 metres
5. The elbow supplied with the standard horizontal
telescopic flue kit is not included in any equivalent length
calculations.
Plume Displacement Kit 60 /100 dia
1M Extensions 45° & 93° elbows
are also available - see the separate
Flue Guide.
NOTE: Flue length is measured from point (i) to (ii) as
shown.
Horizontal
Flues
IMPORTANT
SUPPORT - All flue systems MUST be securely
supported a MINIMUM of once every metre. It is
recommended that every straight piece is supported
irrespective of length. Additional supports are available
as accessories.
VOIDS - Consideration must be given to flue systems
in voids and the provision of adequate access for
subsequent periodic visual inspection.
NOTE: Horizontal flue pipes should always be installed with a fall of at least 1.5°
from the terminal to allow condensate to run back to the boiler.
6. Read this section in conjunction with the Flue Installation
Guide supplied with the boiler.
This bend is equivalent to
1 metre
C
A
(ii)
B
(i)
This bend is equivalent to
1 metre
Total equivalent length =
A+B+C+2 x 90° Bends
20
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8.0 Flue Options
8.2
m
0m
50
The standard horizontal telescopic flue kit allows for lengths
between 315mm and 500mm from elbow to terminal without
the need for cutting (Fig. 14).
Extensions of 250mm, 500mm & 1m are available.
m
5m
31
Flue Lengths
Flue Deflector
Fig. 14
The maximum permissible equivalent flue length is:
10 metres (60/100 system - vertical & horizontal)
20 metres (80/125 system - vertical & horizontal)
15 metres (80/80 twin pipe)
8 metres (60/100 system - vertical connected to
ridge terminal)
For details of Plume Displacement Kit lengths see the Flue
Installation Guide supplied in the literature pack.
Fig. 16
8.3
Flue Trim
1. The flexible flue trims supplied can be fitted on the outer and
inner faces of the wall of installation.
8.4
Fig. 15
Terminal Guard (Fig. 15)
1. When codes of practice dictate the use of terminal guards,
‘Multifit’ accessory part no. 720627901 can be used (Note: This
is not compatible with Flue Deflector referred to below).
2. If a proprietary guard is used it must be identified as suitable
for use with condensing boilers
3. There must be a clearance of at least 50mm between any
part of the terminal and the guard.
4. The flue terminal guard should be positioned centrally over
the terminal and fixed as illustrated.
8.5
Flue Deflector (Fig. 16)
1. If required, push the flue deflector over the terminal end and
rotate to the optimum angle for deflecting plume. Secure the
deflector to the terminal with screws provided.
8.6
Flue Accessories
1. For full details of Flue Accessories (elbows, extensions, clamps
etc.) refer to the Flue Installation Guide supplied in the literature
pack.
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21
9.0 Installation
9.1
Unpacking & Initial Preparation
IMPORTANT
RISK ASSESSMENT - Before commencing the installation
it is recommended that the ‘Five Steps to Risk
Assessment’ document published by the HSE is consulted,
and an assessment performed as described.
GAS SUPPLY - The gas supply, gas type and pressure
must be checked for suitability before connection (see
Section 7.4).
NOTE: a small amount of water may drain from the boiler
in the upright position. If pre-plumbing it will be necessary
to turn the carton over to access the wall plate first.
1. Remove staples, open flaps and remove the cardboard
sheet. Remove the polystyrene side pieces and literature. Two
people can then lift out the boiler (Fig. 17).
Fig. 17
2. After considering the site requirements
(see Section 7.0) position the fixing template on the wall
ensuring it is level both horizontally and vertically.
Part No. 720636502
116mm Dia Minimum
Aperture For Flue Tube
130mm
Side Flue
Centre Line
175 mm
Minimum
Clearance
Vertical Flue
Centre Line
3. Mark the position of the two most suitable fixing slots for
the wall plate and boiler lower fixing holes.
4. Mark the position of the centre of the flue hole (rear exit).
For side flue exit, mark as shown (Fig. 18).
228 mm
Boiler Mounting Bracket
Fixing Slots
50 mm
5. If required, mark the position of the gas and water pipes.
Remove the template.
For Side Flue Exit
6. Cut the hole for the flue (minimum diameter 116mm).
Fig. 18
Ø 8 mm
Ø 8 mm
7. Drill the wall as previously marked to accept the wall plugs
supplied. Secure the wall plate using the fixing screws.
Profile of
Outercase
5 mm Minimum
Side Clearance
8. Using a spirit level ensure that the plate is level before finally
tightening the screws.
5 mm Minimum
Side Clearance
9. Connect the gas and water pipes to the valves on the wall
plate using the copper tails supplied. Ensure that the sealing
washers are fitted between the connections.
View from Underneath
10. Fit the filling loop as described in the instructions supplied
with it.
Condensate
Drain
3/4” BSP
Connections
Pressure
Relief
Valve
(15mm)
25
40 mm mm
65 mm
200 mm
Recommended
150 mm
Minimum
Clearance
65 mm
65 mm
65 mm
65 mm
162.5 mm
Heating
Flow
(22mm)
Part No. 720636502
Hot Water
Outlet
(15mm)
Combi Only
Not System
Gas
Inlet
(22mm)
Cold Water
Inlet
(15mm)
Heating
Return
(22mm)
Combi Only
Not System
Flushing
1. Connect a tube to the heating flow or return pipe (Fig. 20).
Fig. 19
Flushing Tube
9.2
2. Make the flow and return connections to the isolation taps.
Flush the system thoroughly to remove all impurities (see
System Details, Section 6.2).
Heating Flow
Fig. 20
Heating Return
22
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Boiler Mounting
Bracket
9.0 Installation
9.3
Fitting The Boiler
1. Remove the sealing caps from the boiler connections.
NOTE: A small amount of water may drain from the
boiler once the caps are removed.
Sealing Washers
2. Lift the boiler as indicated by the shaded areas. The boiler
should be lifted by TWO PEOPLE. Engage the mounting
bracket at the top rear of the boiler on the wall plate (Fig.21)
(see Safe Manual Handling page 5).
3. Insert the sealing washers between the valves and pipes
on the wall plate and the boiler connections.
4. Tighten all the connections.
Fig. 21
Suggested Lifting Points
shown as shaded area
9.4
Remove Sealing Caps from
under the Boiler before lifting
into position
Fitting the Pressure Relief Discharge Pipe
(Fig. 22)
1. Remove the discharge pipe from the kit.
2. Determine the routing of the discharge pipe in the vicinity
of the boiler. Make up as much of the pipework as is
practical, including the discharge pipe supplied.
Prime Trap by pouring
300ml of water into
flue spigot
IMPORTANT: Make all soldered joints before connecting
to the pressure relief valve. The relief valve is intentionally
angled to the right of the boiler. DO NOT adjust the
position of the valve. The discharge pipe must be installed
before pressurising the system.
Fig. 22a
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
4. Utilising one of the sealing washers, connect the discharge
pipe to the adaptor and tighten the nut hand tight, plus 1/4
turn to seal.
5. Complete the discharge pipework and route it to the
outside discharge point.
9.5
Fig. 22
Discharge Pipe
Condensate Drain (see section 7.7) (Fig. 23)
1. Using the short piece of rubber hose supplied, connect the
condensate drain pipework to the boiler condensate trap
outlet pipe. When connecting the hose, ensure that the
condensate sump is not inadvertantly unscrewed.
Control Box removed
for clarity
Ensure the discharge of condensate complies with any
national or local regulations in force (see British Gas
“Guidance Notes for the Installation of Domestic Gas
Condensing Boilers” & HHIC recommendations).
2. The hose will accept 21.5mm (3/4in) plastic overflow pipe
which should generally discharge internally into the
household drainage system. If this is not possible, discharge
into an outside drain is acceptable.
Condensate Trap
Outlet Pipe
Rubber Hose
Fig. 23
3. The boiler condensate trap should be primed by pouring
approximately 300ml of water into the flue spigot. Do not
allow any water to fall into the air inlet.
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23
9.0 Installation
m
0m
50
m
5m
31
9.6
Fitting The Flue
HORIZONTAL TELESCOPIC FLUE
Terminal Assembly
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.
Fig. 24
2. The two sections can be adjusted to provide a length
between 315mm and 500mm (Fig. 24) when measured
from the flue elbow (there is 40mm engagement into the
elbow).
Connection Assembly
Wall Thickness
3. Locate the flue elbow on the adaptor at the top of the
boiler. Set the elbow to the required orientation (Fig. 25).
NOTE: The flue elbow is angled at 93 degrees to
ensure a fall back to the boiler.
(X)
4. Measure the distance from the outside wall face to the
elbow. This dimension will be known as ‘X’ (Fig. 25).
5. If the distance from the flue elbow to the outside face of
the wall (‘X’ in Fig. 25) is less than 250mm the Connection
Assembly can be discarded and the Terminal Assembly
fitted directly into the elbow.
(X)
Wall
Thickness
Fig. 25
6. In instances where the dimension ‘X’ (Fig. 25) is between
250mm and 315mm it will be necessary to shorten the
Terminal Assembly by careful cutting to accommodate
walls of these thicknesses.
7. To dimension ‘X’ add 40mm. This dimension to be
known as ‘Y’.
‘Peak’ to be uppermost
8. Adjust the two telescopic sections to dimension ‘Y’ and
seal the joint with the tape provided (Fig. 27). Ensure that
the labels marked ‘TOP’ on the Terminal and Connection
Assemblies are uppermost.
9. Using the clearance holes in the Connection Assembly
secure it to the Terminal Assembly using the screws
supplied (Fig. 28).
Fig. 26
‘TOP’ Label
’
n ‘Y
io
ens
Dim
Securing Screw
Sealing Tape
Fig. 27
Fig. 28
‘TOP’ Label
24
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9.0 Installation
Boiler Elbow
Apply the lubricant
supplied for ease of
assembly (do not use
any other type).
9.6
10. Remove the flue elbow and insert the flue through the
hole in the wall. Fit the flue trims if required, and refit the
elbow to the boiler adaptor, ensuring that it is pushed fully
in (Fig. 29).
Adaptor
Ensure Elbow is fully
engaged into Boiler
Adaptor
Fitting the Flue (Cont)
11. Draw the flue back through the wall and engage it in
the elbow. It may be necessary to lubricate to ease
assembly of the elbow and flue (Fig. 30).
Fig. 29
12. Ensure that the terminal is positioned with the slots to
the bottom (Fig. 31). Secure the flue to the elbow with the
screws supplied (Fig. 30).
Apply the lubricant
supplied for ease of
assembly (do not use
any other type).
IMPORTANT: It is essential that the flue terminal is fitted
as shown to ensure correct boiler operation and prevent
water entering the flue.
Ensure Flue is fully
engaged into Elbow
13. Make good between the wall and air duct outside the
building, appropriate to the wall construction and fire rating.
14. If necessary fit a terminal guard (see Section 8.4).
Fig. 30
Slots at bottom
Fig. 31
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25
9.0 Installation
9.7
Making The Electrical Connections
1. See Section 7.5 for details of the electrical supply. Undo
the securing screws and lift the case front panel off.
2. Disengage the securing tab and hinge the control box
downwards. Undo the terminal block cover securing screw
and remove the cover (Fig. 34).
3. Slacken the gland nut in the left of the boiler lower panel
and pass the mains cable through it. Remove the grommet
adjacent to the gland nut, pierce the diaphragm and insert
the cable from the external control system.
Control Box
4. Leave sufficient slack in the cables to allow the Control
Box to be hinged fully open. Tighten the gland nut and refit
the grommet.
5. Connect the Earth, Permanent Live and Neutral wires to
the terminal strip.
Fig. 34
6. Refer to the instructions supplied with the external
control(s).
Fused Spur
L
NOTE: Both the Permanent Live and Neutral
connections are fused.
N
IMPORTANT: Any thermostat MUST be suitable for
230V switching.
Room ‘Stat
N
Fig. 35
b
7. Remove the link between terminals 1 & 2. The 230V
supply at terminal 2 must be connected to the thermostat.
The switched output from the thermostat must be
connected to terminal 1. (Figs. 35 & 36). If the room
thermostat being used incorporates an anticipator it MUST
be wired as shown in Figs. 35 & 36.
1
bk 2
230V
g/y
b
N
NOTE: When only Low Voltage controls are being used
(connected to Terminal M2) it is necessary to remove
the link wire !
br
L
8. Replace the terminal block cover.
Frost Thermostat
Pipe Thermostat
Fused Spur
L
9. See Section 18.0 for details of fitting the Optional Sensor
Accessories.
N
Room ‘Stat
230V
N
9.8
b
Fig. 36
230V
Preliminary Electrical Checks
1
bk 2
1. Prior to commissioning the boiler preliminary electrical
system checks should be carried out.
g/y
External Clock
N
L
b
2. These should be performed using a suitable meter, and
include checks for Earth Continuity, Resistance to Earth,
Short Circuit and Polarity.
br
NOTE: The 230V switched signal for external controls
(Frost Stat - Room Stat - Timer) must always be taken
from terminal 2 at the boiler. Live, Neutral and Earth to
power these controls must be taken from the Fused Spur.
26
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11.0 Commissioning
10.0
10.1
Cap
Commissioning the Boiler
1. Reference should be made to BS:EN 12828, 12831 & 14336
when commissioning the boiler. Ensure that the trap has been
primed - see Section 9.5 paragraph 3.
Automatic Air
Vent
2. At the time of commissioning, complete all relevant sections of
the Benchmark Checklist at the rear of this publication.
3. Open the mains water supply to the boiler and all hot water
taps to purge the DHW system.
Fig. 37
4. Ensure that the filling loop is connected and open, then open the
heating flow and return valves on the boiler. Ensure that the cap on
the automatic air vent on the pump body is opened (Fig. 37).
Pump
2
1
3
4
0
bar
Fig. 38
Control Box
removed for clarity
Heating
Pressure Gauge
5. The system must be flushed in accordance with BS 7593 (see
Section 6.2) and the flushing agent manufacturers instructions.
6. Pressurise the system to 1.5 bar (Fig. 38) then close and
disconnect the filling loop.
7. Test for gas tightness, turn the gas supply on and purge
according to in GB BS 6891 and in IE I.S. 813 "Domestic Gas
Installations".
De-Aeration Function
8. When power is supplied to the boiler for the first time the
software pressure will be displayed. followed by
. However
if
is shown, press
will now
R for 2 to 4 seconds .
be displayed.
9. Press
&
together and hold for at least 6 seconds.
The ‘De-Aeration’ Function will be activated and ‘On’ displayed.
Display showing Gas
Type Recognition
Fig. 39
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.
During the Gas Type Check Function the combustion
ratio will increase for a short time while the gas type is
established.
FUNCTION INTERRUPTION
If either De-aeration or Gas Check is interrupted by a fault
e.g. low water pressure (E118) or air in the gas supply
(E128 or E133) the fault must be rectified and the function
reactivated. During De-aeration, if water pressure is lost,
repressurising to 1.0 bar will allow the function to
continue. Whilst the Gas Type Check is being performed if
water pressure is lost the function can be reactivated by
repressurising then pressing
&
together and
holding for at least 6 seconds. If a gas supply fault occurs
&
.
R must be pressed before
© Baxi Heating UK Ltd 2014
10. The boiler pump will run for up to 10 minutes during which
time the diverter valve will switch between heating & hot water.
This will purge air from the system. The display will show
.
Gas Type Check
11. Once de-aeration is complete the boiler will go automatically
to first fire-up and run at the Ignition Phase fan speed for 3 or 4
minutes to check the gas type (N.G. or Propane L.P.G.). The boiler
software checks the combustion value against the set value.
will be displayed, alternating with a figure representing the
Ignition Phase speed, e.g. ‘33’ or ‘43’ (Note: Each boiler model
will display a different figure).
12. The boiler is factory set for Natural Gas. On a Natural Gas
Supply
will be displayed and the boiler is ready for the Inlet
Pressure & Gas Rate to be checked (Section 10.2).
13. IMPORTANT: In cases where the supplied gas is Propane
gas
will be displayed. Press
for at least 6 seconds to
confirm that this is the intended gas type for the installation.
14. IF THE BOILER IS TO BE OPERATED ON PROPANE A
SUITABLE PERMANENT MARKER PEN MUST BE USED TO
ALTER THE ‘GAS SETTING INFORMATION’ LABEL ADJACENT
TO THE DATA LABEL !
15. 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:
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27
Set Boiler to Maximum Rate
(see 10.3.1)
Allow the combustion to
stabilise. Do not insert probe to
avoid ‘flooding’ the analyser.
Verify Flue Integrity
Indication that products of
combustion & inlet air are
mixing - further investigation is
required.
Check all flue components are
correctly assembled, fixed &
supported. Check the flue &
terminal are unobstructed.
Is O2 20.6% and
CO2 < 0.2% ?
No
TURN APPLIANCE OFF !
Call 0844 871 1555 for
advice.
The appliance MUST NOT be
commissioned until all
problems are identified and
resolved.
10.0 Commissioning
10.2
1. This procedure is mandatory in GB from April 2014. It is
strongly recommended to perform the procedure before that
date.
Perform Flue Integrity
Combustion Check
Insert the analyser probe into the
air inlet test point, allowing the
reading to stabilise.
No
Is O2 20.6% and
CO2 < 0.2% ?
Check CO & Combustion Ratio
at Maximum Rate
Whilst the boiler is still
operating at maximum insert the
analyser probe into the flue gas
test point, allowing the reading to
stabilise.
Yes
Yes
Checking the Combustion - ‘Chimney Sweep’
Function (cont)
No
Is CO < 350ppm
and CO/CO2 ratio
< 0.004 ?
Verify Integrity of Seals
Check all burner seals, internal
flue seals, door & case seals.
Replace any seals that appear
unsound.
Is CO < 350ppm and
CO/CO2 ratio <
0.004 ?
Yes
Set Boiler to Minimum Rate
Allow the combustion to
stabilise. Do not insert probe to
avoid ‘flooding’ the analyser.
Check CO & Combustion Ratio
at Minimum Rate
Whilst the boiler is
operating at minimum insert the
analyser probe into the flue gas
test point, allowing the reading to
stabilise.
Yes
No
TURN APPLIANCE OFF !
Call 0844 871 1555 for advice.
The appliance MUST NOT be
commissioned until all
problems are identified and
resolved.
If commissioning cannot be fully
completed the appliance must be
disconnected from the gas supply
in accordance with the GSIUR.
Note: Check & record the CO &
combustion ratio at both
maximum & minimum rates before
calling 0844 871 1555.
28
No
Is CO < 350ppm and
CO/CO2 ratio <
0.004 ?
Yes
BOILER OPERATING
SATISFACTORILY. NO
FURTHER ACTION
REQUIRED
Ensure test points are capped, the
boiler case front panel is correctly
fitted & secured and all other
commissioning procedures
completed.
Complete the ‘Benchmark’
Checklist, recording the CO &
combustion ratio readings as
required.
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10.0 Commissioning
10.3
Check the Operational (Working) Gas Inlet
Pressure & Gas Rate
Note: The system MUST be cold to ensure the boiler is
operating under full demand. To obtain an accurate
measurement on smaller capacity systems it may be
necessary to open one or more hot taps in order to
maintain the boiler at full rate
1. Press
&
together and hold for at least 6
seconds. ‘On’ will be displayed briefly, followed by ‘304’
then ‘100’ when the boiler is lit, indicating the CH output is
at MAXIMUM (‘Chimney Sweep Function’).
2. With the boiler operating in the maximum rate condition
check that the operational (working) gas pressure at the inlet
gas pressure test point on the gas cock or valve is in
accordance with B.S. 6798 & B.S. 6891. This must be AT
LEAST 17mb ! (LPG - 37mb)
DO NOT check gas pressure here
3. Ensure that this inlet pressure can be obtained with all other
gas appliances in the property working.
Fig. 41
Fig. 40
Inlet Gas Pressure
Test Point
Gas Type Label
Set
24 model 2.54 m3/h
28 model 2.96 m3/h
33 model 3.49 m3/h
Propane
24 model 1.92 kg/h
28 model 2.25 kg/h
33 model 2.64 kg/h
6. Carefully read and complete all sections of the Benchmark
Commissioning Checklist at the rear of this publication that are
relevant to the boiler 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.
When reset for
L.P.G.
Changing the Gas Type
1. It may be necessary to adjust the boiler gas type if the supply is changed, for example
when Natural Gas is provided to a rural area previously reliant on Propane. In these
instances a replacement Gas Type Label may be required, which is available on request
as a spare part.
2. Press
&
alternating with
.
and hold for at least 6 seconds.
to select the next parameter
4. Press
or
gas type. For Natural Gas:For Propane:5. Press
Natural Gas
5. Press
&
together and hold for at least 6
seconds to exit the function.
N.G. Factory
3. Press
Measure the Gas Rate
4. With any other appliances & pilot lights turned OFF the gas
rate can be measured. It should be:-
. Press
7. 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.
will be displayed,
.
to select the value that corresponds with the required
to save the change, then
R to return to the normal display.
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29
11.0 Completion & System Draining
11.1
Completion
1. Replace the case front panel, and secure with the screws
previously removed.
2. This publication must be handed to the user for safe
keeping and each subsequent regular service visit recorded.
Case Front Panel
3. Set the central heating and hot water temperatures to
the requirements of the user. Instruct the user in the
operation of the boiler and system.
4. Instruct the user in the operation of the boiler controls.
Hand over the User’s Operating, Installation and Servicing
Instructions, giving advice on the necessity of regular
servicing.
5. Demonstrate to the user the action required if a gas leak
occurs or is suspected. Show them how to turn off the gas
supply at the meter control, and advise them not to operate
electric light or power switched, and to ventilate the
property.
Facia Panel
Fig. 42
To change the information
displayed see the table below:The
button can be pressed so that the display shows the following
information:1 press - ‘00’ alternates with Sub-Code (only when fault on boiler) or ‘000’
2 presses - ‘01’ alternates with CH Flow Temperature
3 presses - ‘02’ alternates with Outside Temperature (where Sensor fitted)
4 presses - ‘03’ alternates with DHW Temperature
5 presses - ‘04’ alternates with DHW Temperature
6 presses - ‘05’ alternates with System Water Pressure
7 presses - ‘06’ alternates with CH Return Temperature
8 presses - ‘07’ alternates with Flue Temperature
9 presses - ‘08’ alternates with Heat Exchanger Temperature
6. Show the user the location of the system control isolation
switch, and demonstrate its operation.
7. Advise the user that they may observe a plume of vapour
from the flue terminal, and that it is part of the normal
operation of the boiler.
11.2
System Draining
1. If at any time after installation it is necessary to drain the
central heating system (e.g. after replacing a radiator) the
De-Aeration Function should be activated.
2. On refilling the system ensure that there is no heating or
hot water demand, but that there is power to the boiler.
3. Press
&
together and hold for at least 6
seconds. The ‘De-Aeration’ Function will be activated.
4. The boiler pump will run for up to 10 minutes during
which time the diverter valve will switch between heating &
hot water. This will purge air from the system. The display
will show
.
5. Once De-Aeration is complete set the external controls
as required by the user.
30
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Flue Sampling
Point
12.0 Servicing
12.1
Performance Safety Check & 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.
Air Sampling
Point
2. After servicing, complete the relevant Service Interval Record
section of the Benchmark 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
(check air inlet sample).
• The integrity of the boiler combustion circuit and relevant
seals as described in Section 12.2.
• The operational gas inlet pressure as described in Section
10.3.1 to 10.3.7 and the gas rate as described in 10.3.4.
• The combustion performance as described in ‘Check the
Combustion Performance’ (12.1.4 to 12.1.6 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:-
Case Front Panel
Fig. 43
• 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.
Case Front Panel
Securing Screws
• 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 14.1.1 to 14.1.6.
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.
Condensate Trap
Control Box removed
for clarity
6. If the combustion reading (CO/CO 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 12.2) &
re-check.
• Perform the Combustion & Calibration functions (Section
14.0) & re-check.
• Replace the gas valve (Section 13.23) & re-check.
Gasket
12.2
Annual Servicing - Inspection
1. Ensure that the boiler is cool.
Sump
2. Ensure that both the gas and electrical supplies to the
boiler are isolated.
Fig. 44
Condensate
Drain Pipe
3. Remove the screws securing the case front panel. Lift the
panel slightly to disengage it from the studs on top of the case
(Fig. 43) and hinge down the Control Box.
4. Disconnect the condensate drain pipe and unscrew the sump
from the bottom of the condensate trap assembly (Fig. 44).
Remove any deposits from the sump and trap. Clean as
necessary and replace the sump.
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31
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