Baxi i EcoBlue Plus 28 Combi ErP Manual

E
EcoBlue Plus Combi
Installation and Service Manual
Gas Fired Wall Mounted Condensing Combination Boiler
24 - 28 - 33
en
United Kingdom
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.

2 EcoBlue Plus Combi 7219706 - 01 (04/15)
You have just purchased one of our appliances and we thank you for the trust you have placed in our products. Please note that
the product will provide good service for a longer period of time if it is regularly checked and maintained. Our customer support
network is at your disposal at all times.
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.
Model Range
Baxi EcoBlue Plus 24 Combi ErP
G.C.No 47-077-08
Baxi EcoBlue Plus 28 Combi ErP
G.C.No 47-077-09
Baxi EcoBlue Plus 33 Combi ErP
G.C.No 47-077-10
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.
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.
0086
ISO 9001
FM 00866
© Baxi Heating UK Ltd 2015 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.
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.

7219706 - 01 (04/15) EcoBlue Plus Combi 3
Installer Notification Guidelines
Choose Building
Regulations Notification
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
and will issue a
certificate of compliance
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Competent Person's
Self Certification Scheme
Building Control
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Installer Notification Guidelines

4 EcoBlue Plus Combi 7219706 - 01 (04/15)
Contents
Contents
1 Introduction
1.1 General
1.2 Additional Documentation
1.3 Symbols Used
1.4 Abbreviations
1.5 Extent of Liabilities
1.5.1 Manufacturer’s Liability
1.5.2 Installer’s Responsibility
1.6 Homologations
1.6.1 CE Marking
1.6.2 Standards
2 Safety
2.1 General Safety Instructions
2.2 Recommendations
2.3 Specific Safety Instructions
2.3.1 Handling
3 Technical Specifications
3.1 Technical Data
3.2 Technical Parameters
3.3 Dimensions and Connections
3.4 Electrical Diagram
4 Description of the Product
4.1 General Description
4.2 Operating Principle
4.2.1 Central Heating Mode
4.2.2 Domestic Hot Water Mode
4.2.3 Boiler Frost Protection Mode
4.2.4 Pump Protection
4.3 Main Components
4.4 Control Panel Description
4.5 Standard Delivery
4.6 Accessories & Options
4.6.1 Optional Extras
5 Before Installation
5.1 Installation Regulations
5.2 Installation Requirements
5.2.1 Gas Supply
5.2.2 Electrical Supply
5.2.3 Hard Water Areas
5.2.4 Bypass
5.2.5 System Control
5.2.6 Treatment of Water Circulating Systems
5.2.7 Showers
5.2.8 Expansion Vessel (CH only)
5.2.9 Safety Pressure Relief Valve
5.3 Choice of the Location
5.3.1 Location of the Appliance
5.3.2 Data Plate
5.3.3 Bath & Shower Rooms
5.3.4 Ventilation
5.3.5 Condensate Drain
5.3.6 Clearances
5.3.7 Flue/Chimney Location
5.3.8 Horizontal Flue/Chimney Systems
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7219706 - 01 (04/15) EcoBlue Plus Combi 5
Contents
Contents
5.3.9 Flue/Chimney Lengths
5.3.10 Flue/Chimney Trim
5.3.11 Terminal Guard
5.3.12 Flue/Chimney Deflector
5.3.13 Flue/Chimney Accessories
5.4 Transport
5.5 Unpacking & Initial Preparation
5.5.1 Unpacking
5.5.2 Initial Preparation
5.5.3 Flushing
5.6 Connecting Diagrams
5.6.1 System Filling and Pressurising
5.6.2 Domestic Hot Water Circuit
6 Installation
6.1 General
6.2 Assembly
6.2.1 Fitting the Pressure Relief Discharge Pipe
6.2.2 Connecting the Condensate Drain
6.3 Preparation
6.3.1 Panel Removal
6.4 Air Supply / Flue Gas Connections
6.4.1 Connecting the Flue/Chimney
6.5 Electrical Connections
6.5.1 Electrical Connections of the Appliance
6.5.2 Connecting External Devices
6.6 Filling the Installation
6.7 External Controls
6.7.1 Installation of External Sensors
6.7.2 Optional Outdoor Sensor
7 Commissioning
7.1 General
7.2 Checklist before Commissioning
7.2.1 Preliminary Electrical Checks
7.2.2 Checks
7.3 Commissioning Procedure
7.3.1 De-Aeration Function
7.4 Gas Settings
7.4.1 Check Combustion - ‘Chimney Sweep’ Mode
7.5 Configuring the System
7.5.1 Check the Operational (Working Gas Inlet Pressure & Gas Rate)
7.6 Final Instructions
7.6.1 Handover
7.6.2 System Draining
8 Operation
8.1 General
8.2 To Start-Up
8.3 To Shutdown
8.4 Use of the Control Panel
8.5 Frost Protection
9 Settings
9.1 Parameters
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6 EcoBlue Plus Combi 7219706 - 01 (04/15)
Contents
10 Maintenance
10.1 General & Service Message
10.2 Standard Inspection & Maintenance Operation
10.3 Specific Maintenance Operations Changing Components
10.3.1 Spark Ignition & Flame Sensing Electrodes
10.3.2 Fan
10.3.3 Air / Gas Venturi
10.3.4 Burner
10.3.5 Insulation
10.3.6 Flue Sensor
10.3.7 Igniter
10.3.8 Heating Flow & Return Sensors
10.3.9 Safety Thermostat
10.3.10 DHW NTC Sensor
10.3.11 Pump - Head Only
10.3.12 Pump - Complete
10.3.13 Automatic Air Vent
10.3.14 Safety Pressure Relief Valve
10.3.15 Heating Pressure Gauge
10.3.16 Plate Heat Exchanger
10.3.17 Hydraulic Pressure Sensor
10.3.18 DHW Flow Regulator & Filter
10.3.19 DHW Flow Sensor (‘Hall Effect’ Sensor)
10.3.20 Diverter Valve Motor
10.3.21 Main P.C.B.
10.3.22 Boiler Control P.C.B.
10.3.23 Expansion Vessel
10.3.24 Gas Valve
10.3.25 Setting the Gas Valve (CO2Check)
11 Troubleshooting
11.1 Error Codes
11.2 Fault Finding
12 Decommissioning Procedure
12.1 Decommissioning Procedure
13 Spare Parts
13.1 General
13.2 Spare Parts List
14 Notes
15 Benchmark Commissioning Checklist
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7219706 - 01 (04/15) EcoBlue Plus Combi 7
Introduction 1
1 Introduction
1.1 General
WARNING
Installation, repair and maintenance must only be
carried out only by a competent person. This
document is intended for use by competent persons.
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
This appliance must be installed in accordance with the
manufacturer’s instructions and the regulations in force. If the
appliance is sold or transferred, or if the owner moves leaving
the appliance behind you should ensure that the manual is kept
with the appliance for consultation by the new owner and their
installer. 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 (as may be
amended from time to time).
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.
The appliance is designed as a boiler for use in residential
domestic environments on a governed meter supply only. The
selection of this boiler is entirely at the owner’s risk. If the
appliance is used for purposes other than or in excess of these
specifications, the manufacturer will not accept any liability for
resulting loss, damage or injury.
The manufacturer will not accept any liability whatsoever
for loss, damage or injury arising as a result of failure to
observe the instructions for use, maintenance and
installation of the appliance.
WARNING
Check the information on the data plate is
compatible with local supply conditions.
1.2 Additional Documentation
These Installation & Service Instructions must be read in
conjunction with the Flue Installation Guide supplied in the
Literature Pack.
Various timers, external controls, etc. are available as optional
extras. Full details are contained in the relevant sales literature.

8 EcoBlue Plus Combi 7219706 - 01 (04/15)
1 Introduction
1.3 Symbols Used
In these instructions, various levels are employed to draw the
user's attention to particular information. In so doing, we wish to
safeguard the user's safety, prevent hazards and guarantee
correct operation of the appliance. Each level is accompanied by
a warning triangle
DHW: Domestic hot water
CH: Central heating
GB: Great Britain
IE: Ireland
BS: British standard
HHIC: Heating and Hotwater Industry Council
Pn: Nominal output
Pnc: Condensing output
Qn: Nominal heat input
Qnw: Nominal domestic hot water heat input
Hs: Gross calorific value
DANGER
Risk of a dangerous situation causing serious
physical injury.
WARNING
Risk of a dangerous situation causing slight physical
injury.
CAUTION
Risk of material damage.
Signals important information .
Signals a referral to other instructions or other pages
in the instructions.
1.4 Abbreviations

7219706 - 01 (04/15) EcoBlue Plus Combi 9
Introduction 1
1.5 Extent of Liabilities
1.5.1 Manufacturer's Liability
Our products are manufactured in compliance with the
requirements of the various european applicable Directives.
They are therefore delivered with marking and all relevant
documentation. In the interest of customers, we are
continuously endeavouring to make improvements in product
quality. All the specifications stated in this document are
therefore subject to change without notice.
The manufacturer will not accept any liability for loss, damage or
injury arising as a result of:-
Failure to abide by the instructions on using the appliance.
Failure to regularly maintain the appliance, or faulty or
inadequate maintenance of the appliance.
Failure to abide by the instructions on installing the
appliance.
This company declares that no substances harmful to
health are contained in the appliance or used during
appliance manufacture.
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force, and
only used in a suitably ventilated location.
In GB, the installation must be carried out by a Gas Safe
Registered Installer. It must be carried out in accordance with
the current and relevant requirements of legislation and
guidance including 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.
Prior to commissioning all systems must be thoroughly
flushed and treated with inhibitor (see section 5.2.6). Failure
to do so will invalidate the appliance warranty.
Incorrect installation could invalidate the warranty and may lead
to prosecution.

10 EcoBlue Plus Combi 7219706 - 01 (04/15)
1 Introduction
1.5.2 Installer's Responsibility
The installer is responsible for the installation and initial start up
of the appliance. The installer must adhere to the following
instructions:
Read and follow the instructions given in the manuals
provided with the appliance.
Carry out installation in compliance with the prevailing
legislation and standards.
Ensure the system is flushed and inhibitor added.
Install the flue/chimney system correctly ensuring it is
operational and complies with prevailing legislation and
standards, regardless of location of the boiler’s installation.
Only the installer should perform the initial start up and carry
out any checks necessary.
Explain the installation to the user.
Complete the Benchmark Commissioning Checklist - this is a
condition of the warranty !
Warn the user of the obligation to check the appliance and
maintain it in good working order.
Give all the instruction manuals to the user.
1.6 Homologations
1.6.1 CE Marking
EC - Declaration of Conformity
Baxi Heating UK Limited being the manufacturer / distributor
within the European Economic Area of the following
Baxi EcoBlue Plus 24 - 28 - 33 Combi ErP
declare that the above is in conformity with the provisions of the
Council Directive
2009/142/EC 92/42/EEC 2004/108/EC 2006/95/EC
2009/125/EC 2010/30/EU
and has been subject to the following conformity procedures laid
down in
Annex 2 - Article 3 of 2009/142/EC
under the supervision of the British Standards Institution, a
Notified Body authorized by the United Kingdom Competent
Authority, and carrying the Notified Body Number 0086.
Type test for purpose of Regulation 5 certified by:
Notified Body 0085.
Product/Production certified by:
Notified Body 0086.
For GB/IE only.

7219706 - 01 (04/15) EcoBlue Plus Combi 11
Introduction 1
1.6.2 Standards
Codes of Practice - refer to the most recent version
In GB the following Codes of Practice apply:
Standard Scope
BS 6891 Gas Installation.
BS 5546 Installation of hot water supplies for domestic
purposes.
BS EN 12828 Heating systems in buildings.
BS EN 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.
BS 4814 Specification for Expansion Vessels using an
internal diaphragm, for sealed hot water
systems.
IGE/UP/7/1998 Guide for gas installations in timber framed
housing.
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.

12 EcoBlue Plus Combi 7219706 - 01 (04/15)
2 Safety
2 Safety
2.1 General Safety Instructions
2.2 Recommendations
WARNING
Installation, repair and maintenance must be carried
out by a Gas Safe Registered Engineer
(in accordance with prevailing local and national
regulations).
When working on the boiler, always disconnect the
boiler from the mains and close the main gas inlet
valve.
After maintenance or repair work, check the
installation to ensure that there are no leaks.
CAUTION
The boiler should be protected from frost.
Only remove the casing for maintenance and repair
operations. Replace the casing after maintenance
and repair operations.
DANGER
If you smell gas:
1. Turn off the gas supply at the meter
2. Open windows and doors in the hazardous area
3. Do not operate light switches
4. Do not operate any electrical equipment
5. Do not use a telephone in the hazardous area
6. Extinguish any naked flame and do not smoke
7. Warn any other occupants and vacate the
premises
8. Telephone the National Gas Emergency Service
on:- 0800 111 999

7219706 - 01 (04/15) EcoBlue Plus Combi 13
Safety 2
2.3 Specific Safety Instructions
2.3.1 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
assess 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 !

14 EcoBlue Plus Combi 7219706 - 01 (04/15)
3 Technical Specifications
3 Technical Specifications
3.1 Technical Data
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 700mm
Overall Height Inc Flue Elbow - 860mm
Casing Width - 390mm
Casing Depth - 295mm
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommended Operating Range 1-2
DHW Circuit bar
Pressures
Max Operating 8
Min Operating 0.15
Flow Rates (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
IMPORTANT
Min Working
DHW Flow Rate 2 2 2
Expansion Vessel - (For Central Heating
only. Integral with appliance)
bar
Min Pre-charge Pressure 1.0
litre
Max Capacity of
CH System 100
Primary Water Content
of Boiler (unpressurised) 2.5
Connections copper tails
Gas Inlet - 22mm
Heating Flow - 22mm
Heating Return - 22mm
Cold Water Inlet - 15mm
Hot Water Outlet - 15mm
Pressure Relief Discharge - 15mm
Temperatures
C.H. Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
D.H.W. Flow Temp (adjustable)
40°C to 60°C max (± 5°C)
dependent upon flow rate
Clearances
Above Casing 175 mm Min
Below Casing 150 mm* Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)
L.H. Side 5 mm Min
R.H. Side 5 mm Min
*This is MINIMUM recommended dimension.
Greater clearance will aid installation and
maintenance.
Heat Input CH Qn Hs (Gross)
Max Min
24 model kW 22.2 5.2
28 model kW 26.6 6.3
33 model kW 31.1 7.6
Heat Output CH Pn (Non-Condensing)
Max Min
24 model kW 20.0 4.6
28 model kW 24.0 5.5
33 model kW 28.0 6.6
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Electrical Protection
IPX5D (without integral timer)
IP20 (with integral timer)
Internal Fuse Rating F2L
Appliance Category CAT I 2H
Heat Output CH Pnc (Condensing)
Max Min
24 model kW 21.2 4.9
28 model kW 25.3 6.0
33 model kW 29.6 7.1
Heat Input DHW Qnw Hs (Gross)
Max
24 model kW 27.4
28 model kW 32.1
33 model kW 37.8
Heat Output DHW
Max
24 model kW 24.0
28 model kW 28.0
33 model kW 33.0
Condensate Drain
To accept 21.5mm (3/4in) plastic waste pipe
External Fuse Rating 3A
Power Consumption
24 model W 85
28 model W 90
33 model W 95
NOTE: All data in this section are nominal
values and subject to normal production
tolerances.
Appliance Type C13 C33 C53
NOxClass 5
Weights
(24 model)
Packaged Boiler Carton 39.2kg
Installation Lift Weight 34kg
(28 model)
Packaged Boiler Carton 39.2kg
Installation Lift Weight 34kg
(33 model)
Packaged Boiler Carton 41.2kg
Installation Lift Weight 36kg
Gas Nozzle Injector
24 model mm Ø 5.0
28 model mm Ø 5.6
33 model mm Ø 6.6
Where Low Flow Taps or Fittings are intended to
be used in the DHW system connected to a Baxi
EcoBlue Combi it is strongly recommended that
the DHW flow rate DOES NOT fall below 2.5
l/min. This will ensure reliable operation of the
DHW function.

7219706 - 01 (04/15) EcoBlue Plus Combi 15
Technical Specifications 3
0
200 400 600 800 1000 1200
0.5
1
1.5
2
2.5
3
3.5
4
Metre (wg)
Flow Rate (l/h)
Pump - Available Head
0
5
5.5
6
4.5
Pump
Available Head See graph below
Dynamic (nominal) Inlet Pressure
(Natural Gas - G20)
mbar 20
with a CV of 37.78 MJ/m3
Max Gas Rate (Natural Gas - G20)
(After 10 mins)
24 model m3/h 2.61
28 model m3/h 3.05
33 model m3/h 3.59
NATURAL GAS ONLY !
SAP 2009 Annual Efficiency is
89%
This value is used in the UK Government’s
Standard Assessment Procedure (SAP) for energy
rating of dwellings. The test data from which it has
been calculated has been certified by 0085.
Product Characteristics Database
(SEDBUK)
NOTE: All data in this section are nominal
values and subject to normal production
tolerances.
3.1 Technical Data (cont)

16 EcoBlue Plus Combi 7219706 - 01 (04/15)
3 Technical Specifications
3.2 Technical Parameters
Technical parameters for boiler combination heaters
Condensing boiler
24
Baxi EcoBlue Plus Combi ErP
Rated heat output
Seasonal space heating energy efficiency
Auxiliary electricity consumption
Other items
28 33
Low-temperature boiler(1)
B1 boiler
Cogeneration space heater
Combination heater
Prated
kW
Useful heat output at rated heat output
and high temperature regime(2)
P4
kW
Useful heat output at 30% of rated heat
output and low temperature regime(1)
P1
kW
Šs
%
Useful efficiency at rated heat output and
high temperature regime(2)
Š4
%
Useful efficiency at 30% of rated heat
output and low temperature regime(1)
Š1
%
Full load
elmax
kW
Part load
elmin
kW
Standby mode
PSB
kW
Standby heat loss
Pstby
kW
Ignition burner power consumption
Pign
kW
Annual energy consumption
QHE
kWh
GJ
Sound power level,indoors
LWA
dB
Emissions of nitrogen oxides NOX
Dailyelectricity consumption
Domestichot water parameters
Declared load profile
Water heating energy efficiency
Qelec
kWh
Annual electricity consumption
AEC
kWh
Šwh
%
Dailyfuel consumption
Qfuel
kWh
Annual fuel consumption
AFC
GJ
(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C
return temperature (at heater inlet).
(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet.
S
See
The back cover for contact details.
mg/kWh
Yes Yes Yes
Yes Yes Yes
No No No
No No No
No No No
XL XL XXL
20 24 28
20.024.028.0
6.78.09.4
93 93 93
88.087.988.0
98.098.098.1
0.030 0.035 0.040
0.014 0.014 0.014
0.003 0.003 0.003
0.035 0.035 0.040
---
17204 20645 24086
62 74 87
51 52 53
22 20 24
0.151 0.168 0.215
33 37 47
90 88 86
21.340 21.980 27.850
16 17 22

7219706 - 01 (04/15) EcoBlue Plus Combi 17
Technical Specifications 3
3.3 Dimensions and Connections
Dimensions
A 700mm
B 295mm
C 390mm
D 116mm Ø Min.
E 160mm
(207mm for 80/125mm
flue systems)
F 130mm
G 106mm
H 228mm
J 162mm
360° Orientation
Flue Ø 100mm
D
C
B
A
E
G
F
At least 1.5°
H
J
Pressure
Relief
Valve
(15mm)
Condensate
Drain
38.5mm 26.5
mm 65 mm 65 mm 65 mm 65 mm 65 mm
162.5mm(PRV)
Hot Water
Outlet
(15mm)
ColdWater
Inlet
(15mm)
Heating
Return
(22mm)
Heating
Flow
(22mm)
Gas
Inlet
(22mm)
Tap Rail
There must be no part of the air duct
(white tube) visible outside the property.

18 EcoBlue Plus Combi 7219706 - 01 (04/15)
3 Technical Specifications
3.4 Electrical Diagram
Link
b
g/y
y
br
Mains Input Cable
N
E
L
X20 X21 X30 X42X41X40
X60
X23
X22
X50
X10 X11 X12 X13 X14
X1 X2
Boiler
Controls
Flue
Sensor
Heating
Return
Sensor
Heating
Flow
Sensor Igniter
Spark
Ignition
Electrode
Flame
Sensing
Electrode
Gas
Valve
Fan
Safety
Thermostat
b
br
br
b
g/yb
g/y
bkg
br
b
b
b
g/y
g/y
br
b
bk
g
r
bb
r
b
b
br
b
b
br
g
bk
Diverter
Valve
Motor
Hydraulic
Pressure
Switch
Hall Effect
Sensor
DHW
NTC
Sensor Pump
w
r
bk
br
bk
p
y
bw
bkr
g
g
g
bk
br
b
M2
Low Voltage
External Control
Connection
1
2
3
4
5
12
6
7
8
9
10
M1
Mains Voltage
Connection
bk
/R
/P
++
R
r
12345
b
br g/y
Timer Connector
Timer Bridge
br
b
g/y
b
br
b
br
Key To Wiring Colours
b - Blue
bk - Black
br - Brown
w - White
gr - Grey
r - Red
g - Green
g/y - Green/Yellow
y - Yellow
p - Purple

7219706 - 01 (04/15) EcoBlue Plus Combi 19
Description of the Product 4
4 Description of the Product
4.1 General Description
1. The Baxi EcoBlue Plus Combi boilers 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 model - 24 kW DHW
21.2 kW CH Pnc (Condensing)
28 model - 28 kW DHW
25.3 kW CH Pnc (Condensing)
33 model - 33 kW DHW
29.6 kW CH Pnc (Condensing)
3. The boiler is factory set for use on Natural Gas (G20).
4. The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.
5. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the boiler
lower panel. It is visible when the control box is lowered (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.
All systems must be thoroughly cleansed, flushed and
treated with inhibitor (see section 5.2.6).
These Installation & Servicing Instructions MUST be
read in conjunction with the Flue Installation Guide supplied in
the Literature Pack.
Fig. 1
Fig. 2
Boiler Control
Flap
Information
Label
Data Badge
Control Box
removed for clarity

20 EcoBlue Plus Combi 7219706 - 01 (04/15)
4 Description of the Product
4.2 Operating Principle
4.2.1 Central Heating Mode
1. With a demand for heating, the pump circulates water through
the primary circuit.
2. Once the burner ignites the fan speed controls the gas rate to
maintain the heating temperature measured by the temperature
sensor.
3. When the flow temperature exceeds the setting temperature,
a 3 minute delay occurs before the burner relights automatically
(anti-cycling). The pump continues to run during this period.
4. When the demand is satisfied the burner is extinguished and
the pump continues to run for a period of 3 minutes (pump
overrun).
4.2.2 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.
2. The flow of water will operate the DHW 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.
3. The burner will light automatically and the temperature of the
domestic hot water is controlled by the temperature sensor.
4. When the domestic hot water demand ceases the burner will
extinguish and the diverter valve will remain in the domestic hot
water mode, unless there is a demand for central heating.
4.2.3 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.
4.2.4 Pump Protection
1. This activates once a week if there has been no demand. The
pump runs for 30 seconds to prevent sticking.
M
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. Safety 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
1
2
3
4
5
6
7
8
9
10
11
12
13
15
16
14
17
18
19
20
21
22
23
24
25
26
28
27
ABC
DEF
Boiler Schematic
Layout
The boiler can be set in 3 operating modes:- ‘Summer’
(DHW only), ‘Winter’ (CH & DHW) or ‘Heating Only’ (CH only) by
use of the button.