Baxi Ecogen Installation Instructions 1 7210659 Install

2014-11-12

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Installation & Servicing Instructions

Ecogen 24/1.0
Gas Fired Wall Mounted Condensing Boiler
and Power Generator

These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2012

Natural Gas

Propane

Baxi Ecogen 24/1.0
G.C.No 41 075 60

Baxi Ecogen 24/1.0 LPG
G.C.No 41 075 64

This appliance contains a pressure vessel filled with Helium to 23 bar.
Do not strike, drop, drill or puncture the vessel.
Do not unbolt any of the covers or flanges.
The vessel contains no user serviceable parts.
Dispose of safely - see section 18.0 for further safety information.

Building Regulations and the Benchmark Commissioning
Checklist
Building Regulations (England & Wales) require notification of
the installation of a heating appliance to the relevant Local
Authority Building Control Department. From 1 April 2005 this
can be achieved via a Competent Persons Self Certification
Scheme as an option to notifying the Local Authority directly.
In England and Wales the electrical installation of an Ecogen
appliance is notifiable under the current Part P building
regulations.
In Scotland the electrical Installation of an Ecogen appliance
requires a building warrant (legal permission from the local
authority to start the work). This building warrant has to be
approved by a registered electrical installer (known formally as
an ‘approved certifier’) or be checked by the local authority.
In Northern Ireland guidance should be taken from the local
authority or equivalent governing body for all electrical works.
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 2012 All rights reserved. No part of this publication may
be reproduced or transmitted in any form or by any means, or stored in any
retrieval system of any nature (including in any database), in each case whether
electronic, mechanical, recording or otherwise, without the prior written
permission of the copyright owner, except for permitted fair dealing under
Copyrights, Designs and Patents Act 1988.
Applications for the copyright owner’s permission to reproduce or make other
use of any part of this publication should be made, giving details of the proposed
use, to the following address:
The Company Secretary, Baxi Heating UK Ltd,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
WARNING: Any person who does any unauthorised act in relation to a
copyright work may be liable to criminal prosecution and civil claims for damages.

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.

Electrical Regulations
The Distribution Network Operator (DNO) and the Electricity
Provider must be informed of the appliances connection to the
grid.

0086
2

The DNO notification is achieved by the completion of a
G83/1 connection pro-forma (see Document 5133893
supplied) or entry of the relevant details on the DNO website
if available.

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

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

Complete the
Benchmark Checklist

Inform the Distribution Network
Operator (DNO) using the G83/1
pro-forma enclosed (Document
5133893) (or the website provided
by the DNO) and the Electricity
Provider of the connection to the
grid.

LABC will record the data
and will issue a
certificate of compliance

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 and Part P of the Electrical 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.

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

Type test for purpose of Regulation 5 certified by:
Notified Body 0087.

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 gas 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.
- section 15/87 (G83/1)
• Energy Networks Association Engineering Recommendation
G83/1: The recommendations for the connection of Small
Scale Embeded Generators (up to 16A per phase) in parallel
with Low Voltage Distribution Networks,
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current edition of
I.S. 813 ‘Domestic Gas Installations’, the current Building
Regulations and reference should be made to the current ETCI
rules for electrical installation.

All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).

Product/Production certified by:
Notified Body 0086.

Codes of Practice - refer to the most recent version
For GB/IE only.
In GB the following Codes of Practice apply:
Standard
Scope
BS 5482 Part 1
Butane & Propane Gas Installation.
BS 6891
Gas Installation.
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 14336
Installation & commissioning of water based
heating systems.
BS 6798
Installation of gas fired hot water boilers.
BS 5440 Part 1
Flues.
BS 5440 Part 2
Ventilation.
BS 7074
Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
In IE the following Codes of Practice apply:
Standard
Scope
I.S. 813
Domestic Gas Installations.
The following standards give valuable additional information;
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 14336
Installation & commissioning of water based
heating systems.
BS 7074
Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
BS 7671
Requirements for electrical installations
BS 50438
Requirement for the connection of microgenerators in parallel with public low-voltage
distribution networks.

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 using a suitable lifting device. A sack truck is
ideal for manoeuvring the appliance to the room where the installation is to take place.
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 all 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 and manoeuvre the appliance into the installation site (pack weight 120 kg) using a sack truck. Keep the appliance as upright as possible
at all times, see note below.
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.
NOTE: The appliance must be transported at all times in the upright position. The appliance must not be laid on its back / side / front.

IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER - OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !!

CONTENTS
Section

Page

1.0

Introduction

2.0

General Layout

3.0

Appliance Operation

4.0

Technical Data

5.0

Dimensions and Fixings

6.0

System Details

7.0

Site Requirements

8.0

Flue Options

9.0

Installation

10.0

Electrical

11.0

Commissioning

12.0

Completion

13.0

Servicing

14.0

Changing Components

15.0

Combustion Check

16.0

Schematic Wiring

17.0

Fault Finding

18.0

Engine Fault Finding

19.0

Short Parts List

20.0

Pages for Notes

Benchmark Checklist

1.0 Introduction
1.1

Description

1. The Baxi Ecogen 24/1.0 is a fully automatic gas fired wall
mounted condensing heat only boiler which will produce up to
1kW of electricity for use by the householder. Any electricity
excess to requirements at the time of production will be fed
back into the national grid. It is room sealed and fan assisted.
2. The boiler is set to give a maximum output of :24 kW (Heat),

1kW (Electric)

3. The boiler is suitable for use only on fully pumped sealed
systems.
4. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the rear
of the facia (Fig. 1).
5. The boiler model name and serial number are also shown
on the information label on the panel behind the facia. This is
for user reference.
6. Models are available for use on Natural Gas (G20) or
Propane Gas (G31).
Facia

7. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed metered gas supply only.
8. On Commissioning the appliance, the Distribution Network
Operator (DNO) must be informed using the form provided.

Fig. 1
Information Label

9. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal telescopic flue
kit, part no. 5118069.
10. All systems must be thoroughly flushed and treated with
inhibitor (see section 6.1 & 2).

1.2

Contents of Pack

The pack contains:• Boiler
• Wall Plate
• Gas Service Cock
• Fixing Screws & Wall Plugs
• Template
• Literature Pack

1.3

Optional Extras

1. Flueing kits - see Section 8.0
2. Removable THINK Controller
3. Wall Cradle & 5 LED Receiver Kit
4. Outside Sensor
5. Cylinder Sensor

12
25

2.0 General Layout

2.1

2
34

4
23
19
6
20

34
7
5
8
27

28
35

Fig. 2
32

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

Layout
Supplementary Heat Exchanger
Burner - Supplementary
Ignition Electrodes
Flame Sensing Electrodes
Supplementary Gas Valve
Engine Burner
Engine Ignition Electrode
Engine Flame Sensing Electrode
Engine Gas Valve
Gas Inlet
Boiler Flow
Boiler Return
Engine Alternator
PCB Control/Cover
Water Flow Sensor
Safety Thermostats
Flow Temperature Sensor
Condensate Trap
Return Temperature Sensor
Fan
Spool Valve Motor
Spool Valve
Venturis
Overtravel Switches x 2
Combustion Test Point
Air Feed Test Point
Transit Bracket
Engine Head Thermocouples
Service Reset Button
Overcurrent Switch
Start/Stop Resistors
THINK Controller
Drain
Ignition Coils
Ambient Sensor
Wall Plate
EMC Mains Filter

7
8

29
18

30
View from Underneath
Bottom cover removed
for Clarity
Fig. 2a

3.0 Appliance Operation
3.1

1. With a demand for heating or hot water, the pump
circulates water through the primary circuit. If the flow is 4.0
L/min or above the ignition sequence will start.

1
3

2. When the flow temperature reaches the set point
temperature, a 5 minute delay occurs before the burner
relights automatically (anti-cycling). The pump continues to
run during this period.

2
16
15 17

Operating Mode (Fig. 3)

6
3.2

3. When the demand is satisfied the burner is extinguished
and the pump continues to run for a period of 5 minute
(Pump Overrun).

13
19
24

Frost Protection Mode

1. If the boiler return temperature falls below 7° C, then the
boiler pump and heating circuit pump/valve are activated or
opened. If the temperature rises above 8° C, the frost
protection function will be terminated. If the boiler return
temperature falls below 3°C, the supplementary burner will
be switched on until the return temperature reaches 25°C
and the appliance frost protection is stopped.

12
23

2. If the supplementary burner is locked, the engine burner
will be used. In this case, the return temperature limit to start
the burner is increased from 3 to 10°C.

3. If an existing room thermostat is to be used then further
protection for the system can be incorporated by using a
wall mounted frost thermostat. In certain circumstances it
may be necessary to fit a pipe thermostat. If the THINK
Controller is used as a room sensor then it will act as a room
frost protection unit as well - see Section 10.15.

3.3

1. The pump and valve kick is a protective function aimed at
preventing the pumps and valves from seizing.

10
Fig. 3

2. Every friday at 3.00am, the pumps and valves connected
directly to the boiler unit are switched on 30 seconds and off
for 30 seconds, one by one.

Key
1
2
3
4
5
6
7
8
9
10
11
12

Pump/Diverter Valve Protection

Supplementary Heat Exchanger
Burner - Supplementary
Ignition Electrodes
Flame Sensing Electrodes
Supplementary Gas Valve
Engine Burner
Engine Ignition Electrode
Engine Flame Sensing Electrode
Engine Gas Valve
Gas Inlet
Boiler Flow
Boiler Return

13
14
15
16
17
18
19
20
21
22
23
24

Engine Alternator
PCB Control
Water Flow Sensor
Safety Thermostats
Flow Temperature Sensor
Condensate Trap
Return Temperature Sensor
Fan
Spool Valve Motor
Spool Valve
Venturis
Overtravel Switches

3.4

Legionella

1. When a DHW cylinder is fitted with a temperature sensor
an anti-legionella function can be activated, so that at initial
DHW charge and there after at regular intervals the cylinder
is heated to destroy any legionella bacteria, the cylinder
temperature is raised to 65°C.
2. By default this function is not active. Customers have the
choice to activate the function and set how often, or on
what day, and at what time this function runs. Customers
should be informed that the temperature reached may be
considerably higher than their normal requirements (See
Section 11.3 paragraph j).

4.0 Technical Data
4.1

Country - GB/IE - Natural Gas
Appliance Category

CAT I 2H

Max Gas Rate (m3/hr)
Both 2.68 Engine 0.82
Injector (mm)
Engine
4.1

Appliance Type

Supplementary 1.86

Supplementary

5.6

C13

C33

C53

NOx Class

Safety Discharge
Max Operating
Min Operating
Recommended Operating Range

150W

Electrical Protection
Country - GB/IE - Propane Gas
Appliance Category
Max Gas Rate (m3/hr)
Both 1.04 Engine 0.32
Injector (mm)
Engine
3.0

Supplementary 0.72

Supplementary

4.0

Inlet Pressure (LPG - G31)
mbar
37
Heat Input (Net)
kW
Heat Input (Gross)
kW

13A

Internal Fuse Rating
for pump & diverter valve

3.15A

Max

Min

25.3

3.7

Max

Min

28.1

4.1

Min

23.7

3.2

Max

Min

24.3

3.3

See graph below
Frost Thermostat

Diameter
Projection

Connections
Gas Supply
Central Heating Flow
Central Heating Return

5° C

Weights

Condensate Drain
To accept 21.5mm (3/4 in) plastic waste pipe
Flue Terminal
Dimensions

Heat Output (Non-Condensing)
Max
kW

External Fuse Rating

bar
3
2.5
0.5
1-2

Hydraulic Resistance

IP X4

CAT I 3P

Central Heating Primary Circuit
Sealed System only

Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption
24 model

Inlet Pressure (Natural Gas - G20)
mbar
20

Ecogen 24/1.0 and Ecogen 24/1.0 LPG

Packaged Boiler Carton
Installation Lift Weight

100mm
125mm

Clearances
Above Casing

copper tails
15mm
22mm
22mm

Outercase Dimensions
Casing Height
Overall Height Inc Flue Elbow
Casing Width
Casing Depth

Below Casing
Front
Front
L.H. Side
R.H. Side

950mm
1135mm
450mm
426mm

117kg
110kg

300 mm Min (horizontal flue)
200 mm Min (vertical flue)
200 mm Min
450 mm Min (For Servicing)
5 mm Min (In Operation)
5 mm Min
60 mm Min (In Operation)

Heat Output (Condensing)
kW

Pump Head (metres)

Appliance Hydraulic Resistance Chart
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0

Water Flow Rate (litres/min)

5.0 Dimensions and Fixings
Dimensions
At Least 1.5°

A 950mm

B 426mm
C 450mm
D 116mm Ø Min.
E 190mm
Allow at least 250mm for
assembly and servicing

F 133mm
G 145mm
H 268mm

360° Orientation

125mm

Tube Ø 100mm

J
F

6.0 System Details
6.1

Water Circulating Systems

1. The appliance is only suitable for use on sealed systems.
2. Ideally fit a new sealed heating system to Building
Regulations part L1 (2010). If an existing sealed system is
to be used the following procedure must be completed
before the Ecogen is installed.
• The system must be cleaned with Fernox F3
• Power flush the system according to the power
flush equipment supplier’s instructions.
• Fernox MB-1 inhibitor must be added according to
the supplier’s instructions.
Following the treatment process a sample of system water
must be taken and sent to Fernox for analysis to confirm
the system cleaning and dosing process has been
successful. A copy of the report to be sent to Baxi Heating
UK Ltd, heateam, Ecogen team, Brooks House, Coventry
Road Warwick CV3 4LL.
3. Please be aware of the resistance chart for this
appliance, and if you are replacing a low resistance boiler
ie. old cast iron, the system will need to be rebalanced
(See Section 4).
4. The following conditions should be observed on all
systems:
• Drain cocks should be fitted to all system low points.
• All gas and water pipes and electrical wiring must be
installed in a way which would not restrict the servicing
of the boiler.
• Position isolating valves as close to circulating pump as
possible.

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 Fernox F3 and an inhibitor such as
Fernox MB-1.
3. Full instructions are supplied with the products, for
further information contact 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.

6.0 System Details
6.3

Pipework

1. The sizes of flow and return pipes from the boiler
should be determined by normal methods, according to
the requirements of the system. The connections to the
boiler will accept 22mm pipe fittings. Compression
fittings must be used to prevent heat damage to the
boiler (as supplied see Section 9.3).

Copper
0.5m

Copper
0.5m
Flow

Boiler

Return
Copper
1m

Fig. 4

2. A 20 °C drop in temperature across the system is
recommended for condensing boilers, but where
radiator sizing is marginal it may be advisable to retain a
system temperature drop of 11°C.
3. In systems using non-metallic pipework it is necessary
to use copper pipe for the boiler Flow and Return. The
copper must extend at least 1 metre from the boiler
and include any branches (Fig. 4).

6.4

Bypass Requirements

1. An Automatic Bypass must be fitted. The appliance
requires a minimum bypass of 7 l/min for open vented
systems.
Manual Air
Vent
Magnetic
Cleaner
Return

Flow
Pump

6.5

Magnetic Cleaner (Fig. 5)

1. A ‘ADEY MagnaClean TwinTech’ Magnetic Filter
must be fitted on the return to boiler as close to the
appliance as possible. FAILURE TO FIT THIS DEVICE
WILL INVALIDATE THE APPLIANCE WARRANTY.

Boiler

Fig. 5

6.0 System Details
Manual Air
Vent

Safety
Valve

Filling
Loop

Pressure
Gauge

Pump

Magnetic
Cleaner
Boiler

6.6

Expansion
Vessel

Radiator
Circuit

System Drains at
Low Point

Fig. 8

Method of determining minimum valve of
expansion vessel volume for sealed systems

Vessel Charge
Pressure (Bar)

Initial System
Pressure (Bar)

Multiply Total
Water Content Of
System By (Litres)

1.0

1.0
1.5
2.0

0.087
0.152
0.330

1.5
2.0

0.125
0.265

1.5

Table. 1

Example :- System Volume = 75 litres
Vessel Charge Pressure = 1.0 bar
Initial System Pressure = 1.5 bar
Then :- 75 x 0.152 = 11.4 litres
Expansion Vessel Volume = 12 litres
NOTE
Where a vessel of the calculated size is not obtainable then
the next available larger size should be used.

Sealed Systems Details (Fig. 8)

1. SAFETY VALVE - A safety valve complying with the
requirements of BS 6750 Part 1 must be fitted close to
the boiler on the flow pipe by means of a horizontal or
vertically upward connection with no intervening valve
or restrictions and should be positioned to facilitate
testing. The valve should be pre-set and non-adjustable
to operate at a pressure of 3 bar (45 Ibf/in2). It must be
arranged to discharge any water or steam through a pipe
to a safe outlet position.
2. PRESSURE GAUGE - A pressure gauge of minimum
range 0-4 bar (0-60 Ibf/in2) with a fill pressure indicator
must be fitted to the system, preferably at the same
point as the expansion vessel in an easily visible position.
3. EXPANSION VESSEL - An expansion vessel
complying with the requirements of BS 4814 must be
fitted to the system by means of a connection close to
the inlet side of the circulating pump in accordance with
the manufacturers instructions, the connecting pipe being
unrestricted and not less than 15mm (1/2 in) nominal size.
The volume of the vessel should be suitable for the
system water content and the nitrogen or air charge
pressure should not be less than the system static head
(See Table. 1).
Further details of sealed system design can be obtained
from BS 5449 and the British Gas publication entitled
'Specifications for Domestic Wet Central Heating
Systems'.
4. FILLING LOOP - A filling loop connection on the
central heating return pipework must be provided to
facilitate initial filling and pressurising and also any
subsequent water loss replacement / refilling. The sealed
primary circuits may be filled or replenished by means of
a temporary connection between the primary 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. The
filling method adopted must be in accordance with all
relevant water supply regulations and use approved
equipment.
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. VENTING - A method of venting the system during
filling and commissioning must be provided by fitting
manual vents. Care must be taken to ensure any air in
the system is completely vented.
6. HOT WATER STORAGE - The hot water storage
vessel must be of the indirect coil type. All components
used in the system must be suitable for operation at
110°C and at the pressure allowed by the safety valve.

6.0 System Details
6.7
All wired connections

Operator
Unit

Room
Unit 1
Kit A or D

1. A THINK Controller is mounted on the appliance as
standard (It can be mounted on a wall cradle and configured
to use as an room sensor).

Room
Unit 2
Kit D

IMPORTANT: Before running the appliance ensure
parameter 5700 has been set according to the type of
system installed. See sections 10.4 to 10.11 for system types
and section 11.3.k for the change procedure.

Wired
Cradles

2. There Are 4 other optional control components as well as
the THINK Controller which can be used in conjunction with
the Ecogen appliance these are: -

1a - THINK Controller or 5 LED Receiver

•
•
•

All RF connections or mixed
Kit B

Kit C

Operator
Unit

•

RF Cradles

Kit D
RF
5 LED

Controls Component Options for
Intelligent Installations

2 Room Units
Maximum

Kit D
*

Wired
Cradles

* A THINK Controller here implies that the RF facility is not being used - the
customer has reverted to an all wired system

A wired 5 LED Receiver – to run on or off the appliance.
An RF 5 LED Receiver - to run on or off the appliance.
A wired Wall cradle for the THINK Controller or either
5 LED Receiver.
An RF Wall cradle for the THINK Controller.

3. The following Kits are available: A)
B)
C)
D)

A wired Wall cradle with a wired 5 LED Receiver.
An RF Wall cradle with An RF 5 LED Receiver.
An RF Wall cradle with a THINK Controller.
A wired Wall cradle with a THINK Controller.

These can be combined to give the following set ups in the
property

All RF connections or mixed with the user reset off appliance
Operator
Unit

5 LED

Wired Cradle with
either 5 LED Receiver or
THINK Controller
Complete with either of the options
shown above. Depending on the exact
Kit A or B
configuration desired it may be
necessary to purchase single items.

NOTE:- Either a 5 LED Receiver or a THINK Controller must be fitted to the
appliance for the safety of the user or visiting service personnel.

5mm Min

450mm

60mm Min

7.0 Site Requirements
250mm Min

7.1

Location

1. Must not be located in a living space (recommend
locations, garage, utility, and outhouse).
2. There must be sufficient space at the installation location
and in the route to the location for manoeuvring and
operating the lifting equipment (Genie GL-8 lifting equipment
dimensions are 64cm wide x 175cm high x 95cm deep).
This space must be maintained for future access of the lifting
equipment for maintenance.

950mm

3. Wall structure must be a solid flat load bearing wall of
brick or block. Partition and timber frame walls, and dot and
dab plaster board are not suitable. If in doubt consult a
Structural Engineer.
4. To eliminate the transmission of noise from the appliance
and its pipework it is recommended that the central heating
pipework is adequately routed and clipped so that contact
between the structure of the building and pipework is
eliminated.

Fig. 9

7.2
200mm Min

Ensure that there is adequate clearance for the lifting equipment. (Genie GL-8
lifting equipment dimensions are 64cm wide x 175cm high x 95cm deep).

Clearances (Figs. 9 & 10)

1. A flat vertical area is required for the installation of the
boiler.
2. These dimensions include the necessary clearances around
the boiler for case removal, spanner access and air
movement. Additional clearances may be required for the
passage of pipes around local obstructions such as joists
running parallel to the front face of the boiler.

At Least 1.5°

3. Ensure that there is adequate clearance for the lifting
equipment (Genie GL-8 lifting equipment dimensions are
64cm wide x 175cm high x 95cm deep).

7.3

Ventilation of Compartments

1. Where the appliance is installed in a cupboard or
compartment, no air vents are required.
450mm Min

2. BS 5440: Part 2 refers to room sealed appliances installed
in compartments. The appliance will run sufficiently cool
without ventilation.

For Servicing
Purposes

5mm Min
In Operation
Fig. 10

426mm

7.0 Site Requirement
7.4

Test Nipple

Gas Supply

1. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891 (Natural Gas) or
BS 5482-1 (Propane Gas). In IE this is the current edition of
I.S. 813 “Domestic Gas Installations”.

Off Position

View from under appliance
Gas Service Cock

On Position

2. A gas service cock is supplied to enable connection using
15mm copper pipe (Fig. 11).
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. It is recommended that 22mm diameter
pipe is used to within 1m of the appliance.

7.5

Electrical Supply

Fig. 11

1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In GB this is
the current I.E.E. Wiring Regulations. In IE reference should
be made to the current edition of ETCI rules.
2. The mains supply is 230V ~ 50Hz fused at 13A.
NOTE: The method of connection to the electricity
supply must facilitate complete electrical isolation of
the appliance.
Connection must be via a 13A BS1363 Switched Fuse
Spur servicing the boiler and system controls only.
NOTE: this appliance will not work in conjunction
with prepaid meters. Prepaid meters must be
replaced by the electricity provider to enable export
of electricity back into the grid.

7.0 Site Requirements
PSR
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5 to 4

7.6

HPER
0.295
0.282
0.269
0.256
0.243
0.231
0.225
0.219
0.213
0.207
0.201

Heating Plant Emissions Rate (HPER)

1. To enable the house holder to claim the Feed in tariff (FIT)
the heating plant emission rate must be calculated and entered
into the MCS certification submission and recorded in the
Micro chp system commissioning checklist benchmark sheets at
the back of these instructions.
See the Baxi website to calculate the HPER values
http://www.baxi.co.uk/products/get-fit-with-baxi-ecogen.htm.
Calculate perform - http://www.ecogen.baxi.co.uk/mcsperform
2. To find the Heating Plant Emissions Rates for Plant Size
Ratios between 0.5 and 4.0 please see the table opposite.

7.7

Electrical Connection - General

1. The product must be installed by a competent trained
electrician that has been on a Baxi approved course.
2. The fuse rating of the securable isolator shall be 13A.
Distributor’s
Cut-out

Meter

Consumer Unit

Local Isolator

Microgenerator

3. A mains supply of 230V ~50Hz is required.

L
Distributor’s
PME Supply

4. Mains wiring external to the product must be in accordance
with the current IEE (BS 7671) Requirements for Electrical
Installation (Wiring Regulations) and any local regulations.

Main
Switch
N

5132999-02

Fig. 12

5. Connection must be made in a way that allows complete
isolation of the electricity supply - a double pole switch serving
only the product and system controls. The manual isolation
switch shall be capable of being secured in the off (isolation)
position; this switch is to be located in an accessible position
within the customer’s installation.
6. Connection to the mains must be made in accordance with
the latest addition of the Engineering Recommendation G83 Recommendations for the connection of Small - Scale
Embedded Generators (SSEG) in parallel with public low
voltage distribution networks.

WARNING - DUAL SUPPLY
ISOLATE BOTH MAINS AND ON-SITE GENERATION
BEFORE CARRYING OUT WORK

ISOLATE THE
MAINS AT
ISOLATE THE
GENERATOR AT

Fig. 12a

7. The Distribution Network Operator (DNO) must be
provided with information regarding the SSEG Guidance
Notes, installation on the day of commissioning. A notification
sheet is provided which should be completed and sent to your
Distribution Network Operator (DNO) - alternatively this may
be done through the DNO’s website.
8. Two labels (Figs. 12 & 12a) are provided to be placed at:a) The consumer unit
b) The appliance
9. The installer shall provide labelling at the supply terminals
(fused cut-out). meter position, consumer unit and at all points
of isolation within the users premises to indicate the presence
of a micro-CHP unit. An example of the warning label to be
left on site is shown (Fig. 12a).
10. There are two ways in which the Ecogen 24/1.0 appliance
can be electrically installed.
Connection by dedicated circuit (Fig. 13)
Connection into an existing final circuit (Fig. 13a)

IMPORTANT: In designing a connection for the Ecogen 24/1.0 the electrical installer has to
consider all the issues that would need to be covered for a conventional final circuit, including:In Accordance with BS: 7671.
• the maximum demand (and the generator output)
• the type of earthing arrangement
• the nature of the supply
• external influences
• compatibility, maintainability and accessibility
• protection against electric shock
• protection against thermal effects
• protection against over current
• isolation and switching
• equipment selection and installation issues

7.7

13A BS1363
Switch Fused Spur
(securable)

Main Service
Fuse

Consumer unit

Ecogen
Appliance

Customer’s
Wiring

13A BS1363
Switch Fused Spur
(securable)

16A Circuit Breaker
(2 Pole RCD)
Main Service
Fuse

Suppliers
Bi directional
Electrical Billing
Meter

Consumer unit

Ecogen
Appliance

Customer’s
Wiring

Fig. 13a

Consumer unit

Generation
Meter

Export Meter

(ii) Where an Ecogen is connected on the same side of an RCD
as final circuits protected by that RCD, the RCD must disconnect
the line and neutral conductors.

(i) The basic design parameters for the circuit are:
13A BS1363
Switch Fused Spur
(securable)

Existing
Consumption
Meter

Fig. 13b

Disconnection of the final circuit in the event of an earth
fault on the circuit and de-energising of the Ecogen should
both occur within an overall maximum time of 0.4 s for TN
systems and 0.2 s for TT systems. However, if the protective
device for automatic disconnection in case of an earth fault
disconnects line and neutral conductors, it is not necessary
to take account of the time taken for the Ecogen to deenergise.

16. Connection of a Ecogen to an existing final circuit

Socket(s)

Customer’s
Wiring

Ib > Ig where Ib is the design current and Ig is the rated
output current of the Ecogen

(iii) The Ecogen must be provided with means of isolation and of
switching off for mechanical maintenance.

16A Circuit
Breaker
(2 Pole RCD)

DNO’s
Wiring

(i) The basic design parameters for the circuit are:

In > Ib where In is the nominal current of the overload
protective device

Socket(s)

Main Service
Fuse

13. The Ecogen 24/1.0 must not be connected to an installation
by means of a plug and socket.

15. Connection of an Ecogen to a dedicated circuit

Fig. 13

DNO’s
Wiring

12. To enable the FIT to be claimed the electricity generated and
exported must be monitored by meters installed into the
electricity supply as shown in Figs. 13,13a and 13b, for the export
either bidirectional meters as in Figs. 13 and 13a, or by leaving the
existing meter and adding an additional meter as in Fig. 13b. An
extra meter must be added just before the appliance to measure
the electrical generation. The serial number must be submitted
for MCS submission and recorded in both the DNO leaflet and
the Micro CHP system commissioning checklist benchmark sheets
at the back of these instructions.

14. The essential criteria which must be met are given below for
both options.

Suppliers
Bi directional
Electrical Billing
Meter
DNO’s
Wiring

Electrical Connection (cont) - Installer information

11. Whichever of the two options is chosen, it is imperative that
the safety of the electrical installation is not impaired by the
installation of the Ecogen 24/1.0.

The electrical installer should check that the prospective fault current would not change
sufficiently to exceed the fault rating of existing protective devices.
16A Circuit Breaker
(2 Pole RCD)

7.0 Site Requirements

Ecogen
Appliance

Iz > In+Ig where Iz is the current carrying capacity of the
conductors of the final circuit, In is the nominal current of
the overload protective device and Ig is the rated output
current of the Ecogen. This may require the protective
device to be replaced with one having a lower nominal
current rating.
Disconnection of the final circuit in the event of an earth
fault on the circuit and de-energising of the Ecogen should
both occur within an overall maximum time of 0.4 s for TN
systems and 0.2 s for TT systems. However, if the protective
device for automatic disconnection in case of an earth fault
disconnects line and neutral conductors, it is not necessary
to take account of the time taken for the Ecogen to deenergise.

Examples are shown of the following methods of termination:i) to an internal soil & vent pipe
ii) via an internal discharge branch (e.g. sink waste) downstream of the trap
iii) to a drain or gully
iv) to a purpose made soakaway
v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap
vi) pumped into an external soil & vent pipe
vii) to a drain or gully with extended external run & trace heating
It is strongly recommended to discharge internally into the household
drainage system. If connecting to a rain water drain, that drain MUST
discharge into a foul drain.

Insulation

32mm

21.5mm

7.0 Site Requirements
7.8

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 7.8.12 to 7.8.15 for further details.
The condensate discharge pipe MUST NOT RISE at any
point along its length. There MUST be a fall of AT LEAST
2.5° (50mm per metre) along the entire run EXCEPT
when employing a suitable condensate pump in basement
and cellar or similar applications.

i) Termination to an internal soil and
vent pipe

50mm

per me

2.5° M

tre of

inimum

1. The condensate outlet will accept 21.5mm (3/4in) plastic
overflow pipe. It is strongly recommended that this
discharges internally into the household drainage system.
Where this is not possible, discharge into an outside drain is
permissible providing every possible precaution is taken to
prevent freezing.

pipe ru

fall

2. Ensure the discharge of condensate complies with any
national or local regulations in force. BS 6798 & Part H1 of
the Building Regulations give further detailed guidance.

450mm min*
*450mm is applicable to
properties up to 3 storeys.
For multi-storey building
installations consult BS 6798.

ii) External termination via internal discharge branch
e.g sink waste - downstream*

Boiler

The boiler condensate trap incorporates a seal of 75mm,
therefore it is unnecessary to install an air break and trap
in the discharge pipework.

3. The discharge pipe should be run in a proprietary drain pipe
material e.g. PVC, PVC-U, ABS, PVC-C or PP.
4. Metal pipework is NOT suitable for use in condensate
discharge systems.
5. The pipe should be a minimum of 21.5mm diameter and
must be supported using suitably spaced clips of the correct
design to prevent sagging.
6. It is advisable that the full length of condensate pipe is run
internally and preferably be less than 3 metres.
7. Internal runs greater than 3 metres or runs in cold areas
should use 32mm waste pipe.

Sink

50mm

per me

2.5° M

tre of

inimum

fall

pipe ru

Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°

8. External runs MUST be a MINIMUM of 32mm and fully
insulated with material suitable for external use.
9. If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an external
run and sized and insulated accordingly.
10. In all cases discharge pipe must be installed to aid disposal
of the condensate. To reduce the risk of condensate being
trapped, as few bends and fittings as possible should be used
and any burrs on cut pipe removed.

*It is NOT RECOMMENDED
to connect upstream of the
sink or other waste water
receptacle !

7.0 Site Requirements
7.8

iii) Termination to a drain or gully
Boiler

50mm

Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
per me

tre of

2.5° M

inimum

Condensate Drain (cont.)

11. When discharging condensate into a soil stack or waste
pipe the effects of existing plumbing must be considered. If
soil pipes or waste pipes are subjected to internal pressure
fluctuations when WC's are flushed or sinks emptied then
back-pressure may force water out of the boiler trap and
cause appliance lockout.

pipe ru

fall

iv) Termination to a purpose made soakaway
Further specific requirements for soakaway
design are referred to in BS 6798.

Boiler

500mm min

50mm p

er metr

e of pip

2.5° Min

e run

imum fa

Holes in the soak-away must
face away from the building

v) pumped into an internal discharge branch
(e.g. sink waste) downstream of the trap
Sink

50mm

7.0 Site Requirement

per me

tre of p
ipe run
2.5° M
inimum
fall

Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°

7.8

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

pipe ru

fall

Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°

Terminal Position with Minimum Distance (Fig. 15)

(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

7.9

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.
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.

1 In addition, the terminal should be no nearer than 150 mm to an opening in the
building fabric formed for the purpose of accommodating a built-in element such as
a window frame.
2 Only ONE 25mm clearance is allowed per installation. If one of the dimensions

4. * Reduction to the boundary is possible down to 25mm but
the flue deflector kit (part no. 5111068) must be fitted.

D, E, F, G or H is 25mm then the remainder MUST be as shown in brackets, in
accordance with B.S.5440-1.

IMPORTANT:
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.

NOTE: The distance from a fanned draught appliance terminal
installed parallel to a boundary may not be less than 300mm in
accordance with the diagram below
300 min

Terminal
Assembly

Flue

*
Plume
Displacement Kit

IMPORTANT: If fitting a Plume
Displacement Flue Kit, the air inlet
must be a minimum of 150mm from
any opening windows or doors (see
Section 8.11).

Top View Rear Flue

Fig. 14
Property Boundary Line

J,K

T
U

Air Inlet

Opening Window
or Door

R
I

150mm
MIN.

D
E

A
S

J,K

B
L
G

A
H

Fig. 15a

Likely flue positions requiring
a flue terminal guard
© Baxi Heating UK Ltd 2012

Fig. 15

8.0 Flue Options
8.1

Horizontal Flue Systems

1. The standard flue is suitable only for horizontal
termination applications.
Y

2. All fittings should be fully engaged. The approximate
engagement is 40 mm. Use the lubrication provided in the
kit to aid assembly.

3. For long flue runs allow 5 mm per metre for expansion.
4. Maximum permissible equivalent flue lengths are:Horizontal Concentric (60/100) 5 metres

Horizontal
Flues

5. Any additional “in line” bends in the flue system must be
taken into consideration.
Their equivalent lengths are:Concentric Pipes:
(60/100)
135° bend
0.5 metres
93° bend
1.0 metres
The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point X to Y as
shown.
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.

NOTE: Horizontal flue pipes should always be installed with at least 1.5° fall from
the terminal to allow condensate to run back to the boiler.

This bend is equivalent to
1 metre

Total equivalent length =
A+B+C+2x90°Bends

Vertical
Flues
(Twin Pipe)

8.0 Flue Options
8.2

Twin & Vertical Flue Systems

1. Maximum permissible equivalent flue lengths are:Vertical Concentric (60/100)
Vertical Twin Pipe (80/80)

5 metres
10 metres

2. Any additional “in line” bends in the flue system must be
taken into consideration.
Their equivalent lengths are:Concentric Pipes:
135° bend
0.5 metres
93° bend
1.0 metres
Twin Flue Pipe
135° bend
0.25 metres
91.5° bend
0.50 metres

Vertical
Flues

The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point X to Y as
shown.

IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.

Total Equivalent Length =
A+B+C+1x90°Bend

Roof
Terminal

All vertical and angled runs must be included,
measured from the boiler adaptor (point X) to the
joint with the flue terminal (point Y). One 91.5°
bend or two 135° bends can be included without
reduction of the flue length.

The total equivalent
length for this example
is = 6.5 metres.

If further elbows are required the flue length must
be reduced by the following amounts:-

1 metre for each 91.5° bend
0.5 metre for each 45° bend

C
B

Equivalent
Length Value
1m extension
135°bend
91.5°bend

This bend is equivalent to
1 metre

1m
0.25m
0.5m

AIR DUCT
No of
fittings/pipes
5
2
2

Sub total
5.0m
0.5m
1.0m

Equivalent Length Air Duct = 6.5m

Equivalent
Length Value

X
1m extension
135°bend
91.5°bend

1m
0.25m
0.5m

FLUE DUCT
No of
fittings/pipes
5
2
2

Sub total
5.0m
0.5m
1.0m

Equivalent Length Flue Duct = 6.5m

8.0 Flue Options
8.3

Key Accessory
Size
Code No
FLUE GROUP A
Concentric Flue System 100mm diameter
A3
Telescopic Internal Flue Kit
315-500mm 5119654
A2
Telescopic Flue (incl elbow)
5118069
A
Horizontal Flue Terminal (incl elbow)
5118489
B
Flue Extension
1000mm 5111074
C
Flue Bend
93°
5111075
D
Flue Bend (pair)
135°
5111085
U
Pipe Support (painted)
100mmØ 5111080
P
Wall Liner
5111067
S
Flue Terminal Deflector
5111068

FLUE GROUP N
Twin Flue System 80mm diameter
E
Flue Extension (pair)
1000mm
F
Flue Bend (pair)
90°
G
Flue Bend (2 pair)
135°
J
Vertical Flue Boiler Adaptor Kit
H
Vertical Flue Adaptor
W
Pipe Support (pair)
80mm

K,K1

M
H

U,W

5111087
5111072
5111086
5111079
5111084
5111081

FLUE GROUP A, N, G
Vertical Flue Kits
K
Vertical Flue Terminal (80/125 use with Item H) 5111078
K1
Vertical Flue Terminal (60/100)
5118576
L
Pitch Roof Flashing
25°/50°
5122151
M
Roof Cover Plate
246143
N
Flat Roof Flashing
246144

Flue Accessories

8.0 Flue Options
For Twin Flue Systems fit the adaptors as follows:-

8.4

Flue Duct Adaptor (Fig. 17)

Flue Duct Adaptor
1. Engage the flue adaptor on the boiler adaptor, making sure
that it is pushed down as far as possible.
Boiler Adaptor

8.5

Air duct adaptor (Fig. 18)

Blanking Plate
1. Undo the screws securing the blanking plate to the boiler
top panel. Discard the plate.
2. Take one of the gaskets supplied in the kit and place on
the boiler top panel.
3. Using the screws previously removed secure the inlet
adaptor to the top panel.
4. Continue to fit the twin flue system.

Fig. 17

Air Duct Adaptor

Gasket

Fig. 18

8.0 Flue Options
8.6

1. In the case of a pitched roof 25 - 50 degrees, position the lead
tile to replace/flash over existing roof tiling. Make an aperture in
the roof suitable for the lower tube of the roof terminal and
ensure the integrity of the roof cover is maintained. The
adjustable plastic collar can either be positioned on the lead tile
or the lower tube of the roof terminal prior to the final
positioning of the vertical flue through the tile. Check the collar is
correctly located to suit required roof pitch (either 25° to 38° or
37° to 50°). From inside the roof adjust the flue to a vertical
position and secure to the roof structure with the clamp supplied.

Approx
1425mm

Cut the same
amount off the
Air Duct &
Flue Duct

For Roof Terminals

2. For flat roof installations the aluminium flashing must be
incorporated into the roof covering and the appropriate aperture
made in the roof decking. The vertical flue is lowered onto the
flashing making sure the collar of the flue locates securely with the
flashing. (A mastic seal may be necessary). From inside the roof,
adjust the flue to a vertical position and secure to the roof
structure with the clamp supplied.

Air Duct
Flue Duct

IMPORTANT: If the boiler is not fitted immediately after the flue
system, temporary precautions must be taken to prevent rain
entry into the room of installation. Any precautionary measures
must be removed prior to commissioning the boiler.

Push Fit Adaptor

8.7

Flue Dimensions

The standard horizontal telescopic flue kit allows for lengths
between 315mm and 500mm from elbow to terminal (Fig. 19).
The maximum permissible equivalent horizontal flue length is:
5 metres

m
00

5
m

8.8

Flue Deflector
Fig. 19

Flue Trim

1. The rubber flue trim supplied may be fitted to either the
outside wall or on the inner wall of installation.

8.9

Terminal Guard (Fig. 20)

1. When codes of practice dictate the use of terminal guards, they
can be obtained from most Plumbers’ and Builders’ Merchants.

Fig. 21

2. There must be a clearance of at least 50mm between any part
of the terminal and the guard.
3. When ordering a terminal guard, quote the appliance name
and model number.
4. The flue terminal guard should be positioned centrally over the
terminal and fixed as illustrated.

8.10
Fig. 20

Flue Deflector (Fig. 21)

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.

93° Elbow/Plume
Outlet Assembly

8.0 Flue Options
8.11

60Ø Support
Bracket

O Ring

Kit No 5118638
Content of kit
1 0.9m 60/100 Concentric Flue
1 1m 60 Dia Exhaust Flue Pipe
1 Adaptor
2 60 Dia Support Brackets
1 93° Elbow/Plume Outlet Assembly
1 Flexible Flue Trim
3 “O” Rings
1 ‘Jubilee Clip
1 Elbow

0.9 metres
60Ø Exhaust
Flue Pipe
60Ø Support
Bracket

O Ring

Fig. 21a

Plume Displacement Kit (Fig. 21b)

Flexible Flue
Trim

1. This kit is recommended for installations where the
condensate plume emitted from the flue may cause a nuisance
or affect the surroundings.

Adaptor
‘Jubilee’ Clip
O Ring

2. The terminal must be positioned outside the building with
the air inlet facing downward and outlet connection upwards.
Elbow

60/100Ø
Concentric Flue

45°
45°

Outlet must be at
least 45° from
wall face

3. The plume outlet must always be at least 45° to the wall,
with the ‘peak’ uppermost to prevent rain entry (Figs. 21c &
21d), and be at least 2 metres above ground level. It must be
secured as shown in Fig. 15a. The plume outlet must also be
at least 500mm from the air inlet in any direction (Fig. 21d).

Fig. 21b

‘Peak’ Uppermost

NOTE: The outlet must be positioned so that any
condensate plume is directed away from adjacent surfaces.
There must be a constant fall along the entire length of the
flue system from the outlet back to the boiler.
4. It is possible to reduce or increase (with the addition of
extensions) the length of either or both the 60/100 concentric
and 60Ø exhaust.
5. Standard concentric flue extension kits may be added
between the boiler elbow and the terminal assembly.
6. The minimum length of the concentric flue is 100mm when
measured from the edge of the flue elbow.

500mm Min.

IMPORTANT: The maximum equivalent length of
concentric flue is:- 5 metres
Additional bends may be fitted in the concentric flue, but
the equivalent length must be reduced by 1 metre (93°
elbow) or 0.5 metres (45° elbow).

Fig. 21c

Air Inlet at Bottom

Fig. 21d

7. 60Ø 1 metre extensions (including support bracket), and
additional 93° & 45° elbows are available. Any additional 93°
& 45° elbows must be accounted for when calculating flue
lengths.
NOTE: Permitted positions of the plume outlet relative to
doors, windows etc. are the same as for conventional
concentric flues as detailed in the main Installation &
Servicing Instructions and BS5440 Pt. 1. It is NOT
necessary to fit a terminal guard over the air inlet or the
plume outlet.

8.0 Flue Options

7
60 Ø Exhaust (metres) X

6
5
4
3

4
3

0
2

In the graph the solid line diagonal represents the
relationship between the concentric flue assembly (and any
extensions) and the 60Ø exhaust (and any extensions or
additional bends).

Concentric 60/100 Flue (metres) Y

Example 1
Flue Lengths - Not Permissible

Example 2
Flue Lengths - OK

7
60 Ø Exhaust (metres) X

Example 1 - Not Permissible
If, for instance, a concentric length of 4 metres was required
and the 60Ø exhaust needed to be 3 metres the graph
shows that this combination would NOT be permissible as
the intersection point would be above the solid diagonal line.
Example 2 - Flue Lengths OK
Where both lengths have been determined they can be
applied to the graph to check that the installation is
permissible. For example, if it was known that 2 metres of
concentric flue and 2 metres of 60Ø exhaust were required,
the values could be applied to the graph as shown in
Example 2. As the point of intersection of the dotted lines is
below the solid diagonal line, the combination of lengths is
shown to be acceptable.

6
5
4
3

Example 3 - Flue Lengths OK
In the example shown, assume that the concentric part of
the flue needs to be 1.6 metres long. Find the position of
‘1.6’ on the horizontal axis of the graph and then project
upwards to the solid diagonal line. This is represented by the
vertical thick dotted line. Where this dotted line intersects
with the solid diagonal line on the graph, project across to
the vertical axis. As can be seen this corresponds with 4.0
metres. Therefore, the total equivalent length of the 60Ø
exhaust can be up to 4.0 metres. Any elbow equivalencies
must be accounted for i.e. 93° elbows are equal to 1 metre,
each 45° elbow to 0.5 metres.

2
1
0
0

Concentric 60/100 Flue (metres) Y
Example 3
Flue Lengths - OK

60Ø Exhaust

0.5 metre Extension

X
Y

Support
Bracket

45° Elbow

Flue Length - Worked Example
93° Elbow
0.5 metre Extension

Concentric 60/100 Flue

0.5 metre Extension
Fig. 21e

Concentric Flue

Additional Accessories
93° Elbow
45° Elbow (Pair)
1 metre 60Ø Extension

Determining Permissible Lengths

8.12

5121369
5121370
5121368

Fig. 21f

In the diagram (Fig. 21f) opposite an additional 93° elbow and
pair of 45° elbows have been included in the 60Ø exhaust.
Also 1 straight extension piece has been used.
To calculate total length:Length of 60Ø supplied in kit =
1 metre Extension =
1 x 93° Elbow =
2 x 45° Elbow =

1 metre
1 metre
1 metre
1 metre (0.5 metres each)

Total 60Ø =

4 metres

After consulting the table in Example 3 it can be determined
that the concentric flue could be up to approximately 1.6
metres long.

8.0 Flue Options
8.13

General Fitting Notes

NOTE: The flue system may only be installed as described
in this section
1. Cut a hole in the external wall which the concentric flue
assembly will pass through. The hole should allow the flue to
fall back to the boiler at an angle of 1.5° to 3°.
Min. 2 metres

2. When completed the terminal must be at least 2 metres
above ground level (Fig. 21g).
3. Measure and cut to size the concentric assembly and any
extensions that are being used.
4. Insert the concentric assembly through the hole from
outside the building.
5. If required, the flexible flue trim should be fitted prior to
this as it cannot be fitted after. Use the large ‘Jubilee’ clip to
secure the trim to the flue (See Fig. 21h, trim shown dotted),
with the screw part of the clip at the bottom.

Fig. 21g

Flue Trim

6. Connect any extensions or elbows that are being used to
the concentric assembly. Engage the extension, elbow or
concentric assembly in the boiler flue elbow. Fit the boiler flue
elbow to the boiler adaptor.
7. Ensure that the concentric assembly and any extensions fall
back to the boiler at an angle of at least 1.5° and that the
external air inlet is to the bottom.

Spigot

8. Use suitable brackets to support the concentric assembly
and any extensions, and make good inside and outside.
Position of ‘Jubilee’ Clip
screw

Fig. 21h

9. The 60Ø exhaust can now be fitted. Slide the adaptor over
the plain end of the 60Ø exhaust (Fig. 21k) and engage the
exhaust in the terminal. Slide the adaptor down over the
spigot. Mark and drill the adaptor, using a 2mm bit, as shown
in Fig. 21j. Secure the adaptor to the spigot using one of the
screws supplied.

50mm

Adaptor

10. If it is necessary to shorten the 60Ø exhaust or any of the
extensions, the excess material must be cut from the plain
end of the pipe.
Fig. 21k

30mm

Fig. 21j

11. Determine the position of the 60Ø exhaust and mark on
the wall a suitable position for the support bracket. If
extensions are being used, a support bracket is supplied in
each kit.
12. Drill the wall, and fit the bracket(s) using the plug and
screw provided.
13. Mark and drill the 60Ø exhaust, using a 2mm bit, as shown
in Fig. 21L. Complete the installation of the 60Ø exhaust,
securing in the brackets.

30mm
Fig. 21L

14. Fit the 93° elbow/plume outlet and secure with the two
remaining screws supplied. Ensure the plume outlet is at least
45° to the wall and that the ‘peak’ is uppermost (Fig. 21m).
Fig. 21m
© Baxi Heating UK Ltd 2012

8.0 Flue Options
Plume Outlet

Elbow

8.13

General Fitting Notes (cont.)

15. For aesthetic purposes it is permissible to route the 60Ø
exhaust in an enclosed box, but the air inlet and plume
outlet MUST remain in free air.
16. It is also possible to separate the plume outlet from the
93° elbow to allow the flue to be installed as shown in
Fig. 21n.

17. To do this, first slacken the two screws retaining the
plume outlet to the elbow, and remove the outlet (Fig. 21p).
The elbow can now be used to connect the vertical to
horizontal 60Ø exhaust (Fig. 21n). Retighten the screws in
the elbow.

Fig. 21n

18. The outlet can now be fitted into the female end of an
60Ø extension piece. It must be secured using two of the
screws supplied in the bag with the ‘Jubilee’ clip.
19. Mark the female end of the extension at 30mm as shown
in two positions, directly opposite each other (Fig. 21q).

Fig. 21p

20. Using a suitable bit (e.g. 2mm), drill through the
extension and outlet. Secure using two of the screws
supplied.

30mm

21. The remaining screw must be used to secure the adaptor
to the concentric terminal.
Fig. 21q

22. When the plume outlet is positioned under a balcony or
other projection (Fig. 21r) it must protrude at least 200mm
(it is not necessary to extend it further than this).

200mm Min.

23. When under balconies or projections it is permissible to
rotate the concentric flue length up to 70°, clockwise or anticlockwise (Fig. 21s), if there is insufficient space to connect
vertically.
24.This will allow the connection of the exhaust to the outlet
spigot.
25. All other minimum & maximum dimensions must be
adhered to, and the air inlet positioned such that it will not
be subject to rain entry.

Fig. 21r

70°

Concentric Flue Length
(shown end-on)

Outlet Spigot

Fig. 21s

9.0 Installation
NOTE: - Installers of this appliance must have undergone
Baxi Ecogen Training and been approved to install this
appliance.

9.1

Unpacking & Initial Preparation

NOTE: Maintain the appliance upright at all times. Do not
lay the appliance on its back, sides or front. Drilling of the
wall or ceiling for flue and pipe work must be completed
before the appliance is fitted to the wall.
Fig. 22
Fig. 23

The gas supply, gas type and pressure must be checked for
suitability before connection (see Section 7.5).
a) Remove the shrink wrap and literature pack.

Remove Screws

Back Plate

b) Remove the upper packaging to leave the appliance on the
base packaging (Fig. 23).
c) Remove the back plate from the appliance by removing the
2 securing screws and undo the 2 fixing nuts on the top of the
panel using a 10mm spanner (Fig. 24).

Loosen Securing
Nuts

d) Take care:- The back panel can fall suddenly on release.
1. After considering the site requirements
(see Section 7.0) position the fixing template on the wall
ensuring it is level both horizontally and vertically. Ensure that
there is adequate clearance for the lifting equipment (see
Section 7.2).

Hinge up the Securing
Nuts to remove Back Plate

Fig. 24

2. Mark the position of the six most suitable fixing holes for the
wall plate positions B+C (as marked on the template). Where
possible mark the position of the centre top fixing position A
(marked on template).
3. Mark the position of the centre of the flue hole (rear exit)
using the paper template supplied. For side flue exit, mark as
shown (Fig. 25).
4. If required, mark the position of the gas and water pipes.
Remove the template.

133mm

5. Cut the hole for the flue (minimum diameter 116mm, a
minimum horizontal hole of 116mm will give the correct
clearance for the flue to run at the required angle).
6. Drill the single hole (10mm diameter for wall plugs
provided) as previously marked and position the back plate on
the wall position A on template. Push one of the wall plugs
supplied through the plate and secure it to the wall with one
of the 80mm screws (Fig. 26). If is not possible to use Position
A use one of the other six positions marked B+C.

For Side Flue Exit
Fig. 25

Fig. 26

7. Check that the top edge is horizontal with a spirit level.
Retighten the screw. Drill the remaining 6 positions at B+C
and secure the back plate to the wall.
8. For correct installation the back plate must be absolutely
flat and vertical - check before mounting the boiler. If there
is any unevenness or the back plate is not mounted in the
vertical plane use packing to correct any out of true.

Wall Plate

9.0 Installation
Ensure that there is adequate
clearance for the lifting equipment.

9.2

Bottom edge of Appliance
to rest on Bracket

60mm
Engage Securing Nuts and
tighten to secure appliance

60mm

Fig. 27

Fitting The Boiler

1. Using a suitable lifting device, lift the appliance on its base
packaging. Offer the appliance up to the wall plate and engage
the bottom edge of the back of the appliance on to the wall
plate (Figs. 27 & 28). Ensure that there is adequate clearance
for the lifting equipment (see Section 7.2).
2. Push the appliance back onto the wall plate and engage the
securing nuts at the top of the appliance by sliding to the right
and swinging down (Figs. 28 & 29).
3. Tighten the two securing nuts on the wall plate and
complete the securing of the appliance by replacing the two
screws previously removed. (Figs. 29 & 30).

Base Packaging

4. Remove the base packaging.

Push appliance back to
wall plate and engage
securing nuts

9.3

Service connections

1. Connect the central heating circuit to the top of the
appliance using 22 mm compression fittings to avoid heat
damage to the case and seals; the return is on the left and the
flow is on the right.
NOTE: To assist with the purging of air from the system
pour water into the flow and return connections to displace
the air in the heat exchangers.

160mm

2. Connect the gas to the bottom right of the appliance using
the 15 mm gas cock provided (in the top of the packaging).
Remove the bottom cover and lower the control tray (See
Section 10.1 paragraph 3 and Figs. 40 and 41).
Install with the test nipple to the left (see Fig. 11) this allows
the connection to the appliance to be tightness tested
independently of the gas pipework up to the appliance which
then can be tested using the test nipple on the gas meter.
It may be difficult to reassemble the bottom panel if this is not
done.

Fig. 28

Engage bottom edge of appliance
on to wall plate
Hinge down the Securing Nuts
and tighten to secure appliance

3. Note: Care must be taken to ensure that the over current
switch is not disturbed from its correct position (See Fig. 2a
when replacing the bottom cover). The switch should be up at
the back - the ‘1’ should be depressed.

9.4

Condensate Drain - see section 7.8

1. Connect the condensate drain to the trap outlet pipe.
Prime Trap by pouring
300ml of water into
the flue spigot

Fig. 29

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”.
Replace Screws

Fig. 30
Fig. 30a

2. The connection will accept 21.5mm (3/4in) plastic overflow
pipe which should generally discharge internally into the
household drainage system. If this is not possible, discharge into
an outside drain is acceptable.
3. The 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.

9.0 Installation
9.5

m
0m

Fitting The Flue

HORIZONTAL TELESCOPIC FLUE

m
15

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. The outer duct of the Connection Assembly is
painted white. On the Terminal Assembly the outer duct is
unpainted.
2. The two sections can be adjusted to provide a length
between 315mm and 500mm (Fig. 31) when measured
from the flue elbow (there is 50mm engagement into the
elbow).

Connection Assembly
Fig. 31

3. Locate the flue elbow on the adaptor at the top of the
boiler. Set the elbow to the required orientation (Fig. 33).
NOTE: The flue elbow is angled at 93 degrees to
ensure a fall back to the boiler.
4. Measure the distance from the outside wall face to the
elbow. This dimension will be known as ‘X’ (Fig. 32).
Wall Thickness

5. If the distance from the flue elbow to the outside face of
the wall (‘X’ in Fig. 32) is less than 250mm the Connection
Assembly can be discarded and the Terminal Assembly cut
and fitted directly into the elbow.

Flue Elbow
(X)

6. In instances where the dimension ‘X’ (Fig. 32) is between
250mm and 315mm it will be necessary to shorten the
Terminal Assembly by careful cutting to accommodate
walls of these thicknesses.

Apply Lubricant for
ease of assembly.

Ensure Elbow is fully
engaged into Boiler
Adaptor

7. To dimension ‘X’ add 50mm. This dimension to be
known as ‘Y’.

Fig. 33

(X)
Wall Thickness

Fig. 32
© Baxi Heating UK Ltd 2012

9.0 Installation

’

‘Y
ion

ens

Dim

9.5

Fitting the Flue (Cont)

Securing Screw
Fig. 34

‘Peak’ to be uppermost

8. Adjust the two telescopic sections to dimension ‘Y’
(Fig. 34). Ensure that the rivets and holes in the Connection
Assembly are aligned horizontally (Fig. 35).
9. Using a 2mm bit, drill through the holes at the end of the
Connection Assembly into the Terminal Assembly and
secure them together using the screws supplied (Fig. 34).
Seal the joint with the tape provided (Fig. 36).

Apply Lubricant for
ease of assembly.
Ensure Flue is fully
engaged into Flue
Elbow

Rivet & Hole to be
aligned on horizontal
centreline

10. Remove the flue elbow and insert the flue through the
hole in the wall. Refit the elbow to the boiler adaptor,
ensuring that it is pushed fully in (Fig. 36).

Fig. 35

Sealing Tape

11. Draw the flue back through the wall and engage it in
the elbow. It may be necessary to use soap solution or
similar to ease assembly of the elbow adaptor and flue
(Fig. 36).
12. Ensure that the terminal is positioned with the slots to
the bottom (Fig. 37). Secure the flue to the elbow with the
self drilling screws supplied (Fig.36).
IMPORTANT: It is essential that the flue terminal is fitted
as shown to ensure correct boiler operation and prevent
water entering the flue.

Fig. 36

13. If necessary make good between the wall and air duct
outside the building.
14. Fit the flue trim if required, and if necessary fit a terminal
guard (see Section 8.8 & 8.9).
CONCENTRIC VERTICAL FLUE
15. Once the length of the vertical concentric extension has
been determined mark and carefully cut off the excess
material. The cut end MUST be square and free of burrs to
ensure correct insertion into the boiler adaptor.
Slots at bottom

Extension

Tape
Fig. 38

Apply Lubricant for
ease of assembly.

Ensure Extension is
fully engaged into
Boiler Adaptor

16. Measure 25mm from the end of the flue extension and
apply a length of tape around the outer duct (Fig. 38).
17. Engage the extension into the adaptor up to this
position (Fig. 39). Once the installation of the flue is
complete and all support brackets are securely in place
remove the tape.

25mm

Cut End

Fig. 37

Fig. 39

10.0 Electrical
10.1

Making The Electrical Connections

This appliance shall be connected to a suitably protected
electrical supply i.e., 16A - see section 7.7.
NOTE: Ensure all cables are secured using the cable clamps
provided. When accessing the appliance controls area, take
care not to let the control box drop down in an
uncontrolled manner as this may cause damage.
1. To gain access to the controls tray / electrical wiring area,
remove the outercase by lifting off the plastic fascia that is held
on by two magnets. Undo the two screws holding the
outercase, pull the bottom edge forward, lift and disengage from
the top of the appliance (Fig. 40).
2. Slacken the four screws from the bottom cover and remove
the cover (Fig. 40).
3. Remove the two screws holding the control tray. Pull the
front of the control tray forward and lower it carefully (Fig. 41).
DO NOT allow the tray to fall in an uncontrolled manner.
4. Ensure all cables are secured using the cable clamps provided.
Fig. 40
Plastic
Fascia

Bottom Cover

5. Ensure that the lengths of the live and neutral conductors are
shorter that the earth conductor, so that if the cable slips in its
anchorage the current carrying conductors become taut before
the earth conductor.

10.2

System installation options.

1. There are two installation options available, Intelligent and
Retro. Y-plan, S-plan, W-plan and S-Plan with a second heating
circuit are all available both with Intelligent and Retro
installations.
IMPORTANT: Before running the appliance ensure
parameter 5700 has been set according to the type of system
installed. See sections 10.4 to 10.11 for system types and
section 11.3.k for the change procedure.
Control Tray

Control Cover
Fig. 41

A) An Intelligent system operates the Ecogen with room
sensors, an optional extra outdoor sensor (an outdoor sensor
can only be installed in conjunction with a room sensor to
enable weather compensation), a DHW tank sensor or DHW
tank thermostat and will give the highest overall efficiency with
increased electrical power generation and is therefore the
recommended way to install the appliance.
The Removable THINK Controller must be used as a
Programmable Room Sensor for all intelligent installation.
B) Retro installations operate the Ecogen with a new or existing
external system wiring centre. This means that the installer has
the option to retain an existing room thermostat, DHW
thermostat and programmer. An outdoor sensor for weather
compensation cannot be used in this case. The THINK
Controller must remain on the appliance (See Section 10.11).

10.0 Electrical
10.3

Complete Wiring Configuration

1. All wiring external to the appliance must be in accordance
with I.E.E. BS 7671 - requirements for Electrical Installations.
IMPORTANT: Before running the appliance ensure
parameter 5700 has been set according to the type of
system installed. See sections 10.4 to 10.11 for system types
and section 11.3.k for the change procedure.
‘Break-off’ Tabs

Mains
230Vac 50Hz
In/Out

N
L
Requirement for
all installation types
E

Fused*

E
Fused*

8 8

Retro
Installation

Fused*

System
Pump
Output

N
L

(Out)

N (Out)
L** (Out)

230Vac 50Hz
Wiring Centre Output
Boiler ON Input

Boiler On (In)

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)

Intelligent
Installations
(Recommended)

* NOTE: All Fuses 3.15 A

Valve

230 Vac 50 Hz ***
System Valve Outputs
DHW Cylinder Thermostat I/O

CT (In)
CT** (Out)

Out Door
Sensor (In)
Out Door
Sensor (Out)
Cylinder
Sensor (In)
Cylinder
Sensor (Out)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

5Vdc System Sensors I/O

12Vdc Optional Extra Room Unit I/O

** Permanent Live once the 230V supply is connected
*** Ensure all system wiring is correct to wiring regulations (BS7671) and
fully tested before connection to avoid any damage to the appliance controls.

10.0 Electrical

Intelligent Installations

10.4

Y-Plan with DHW cylinder sensor

Mains
Supply.

N
L

Pump
8

Fused

- White
- Orange
- Grey
- Blue
- Green/Yellow

Fused

8 8

Key
w
o
gr
b
g/y

Fused

3 Port
Mid Position Valve

w
o
gr
b
g/y

N
L

(Out)

N
L

(Out)
(Out)

Boiler On (In)

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)
Valve

Valve

C/S
C/S

(Out)
(In)

Out Door
Sensor (In)
Out Door
Sensor (Out)
Tank
Sensor (In)
Tank
Sensor (Out)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

Wall Cradle

10.0 Electrical

Intelligent Installations

10.5

Y-Plan with DHW cylinder Thermostat

1. The appliance MUST have a permanent Live/Neutral/Earth
connection. The pump must be connected to the appliance as
shown.
2. Set parameter 5700 to ‘2’ for one heating circuit - see section
11.3.k.
3. The DHW set point on the THINK Controller must be the
same as the thermostat set point on the cylinder. If this is not
done the DHW temperature may not be achieved or the
recovery time will be increased.
NOTE: It is not possible to operate a second heating circuit with
a Y-Plan system.

Mains
Supply.

N
L

Pump
8

Fused

- White
- Orange
- Grey
- Blue
- Green/Yellow

Fused

8 8

Key
w
o
gr
b
g/y

Fused

3 Port
Mid Position Valve

w
o
gr
b
g/y

N
L

(Out)

N
L

(Out)

Boiler On (In)

CH1

(On)

CH2

(On)

DHW(On)
DHW(Off)
Valve

Valve

CT
CT

Out Door
Sensor (In)
Out Door
Sensor (Out)
Out Tank
Sensor (Out)
In Tank
Sensor (In)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

Wall Cradle
40

(Out)

(In)
(Out)

10.0 Electrical

Intelligent Installations

10.6

W-Plan with DHW cylinder sensor

1. The appliance MUST have a permanent Live/Neutral/Earth
connection. The pump must be connected to the appliance as
shown.
2. Set parameter 5700 to ‘2’ for one heating circuit - see section
11.3.k.
3. The rest port of the 3 port valve needs to be connected to
the central heating circuit so that the valve is driven to the
DHW position. It is most likely that the three port valve on an
existing primary circuit will have to be turned round.
NOTE: It is not possible to operate a second heating circuit with
a W-Plan system.

Mains
Supply.

N
L

Pump
8

Fused

Key
br - Brown
b
- Blue
g/y - Green/Yellow
8 8

Fused
Fused

3 Port
Spring Return Valve
br
b
g/y

N
L

(Out)

N
L

(Out)
(Out)

Boiler On (In)

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)
Valve

Valve

C/S
C/S

(Out)
(In)

Out Door
Sensor (In)
Out Door
Sensor (Out)
Cylinder
Sensor (In)
Cylinder
Sensor (Out)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

10.0 Electrical

Intelligent Installations

10.7

W-Plan with DHW cylinder thermostat

1. The appliance MUST have a permanent Live/Neutral/Earth
connection. The pump must be connected to the appliance as
shown.
2. Set parameter 5700 to ‘2’ for one heating circuit - see section
11.3.k.
3. The rest port of the 3 port valve needs to be connected to
the central heating circuit so that the valve is driven to the DHW
position. It is most likely that the three port valve on an existing
primary circuit will have to be turned round.

Mains
Supply.

4. The DHW set point on the THINK Controller must be the
same as the thermostat set point on the cylinder. If this is not
done the DHW temperature may not be achieved or the
recovery time will be increased.

N
L

NOTE: It is not possible to operate a second heating circuit with
a W-Plan system.

Pump
8

Fused

Key
br - Brown
b
- Blue
g/y - Green/Yellow
8 8

Fused
Fused

3 Port
Spring Return Valve
br
b
g/y

N
L

(Out)

N
L

(Out)

CH1

(On)

CH2

(On)

DHW(On)
DHW(Off)
Valve

Valve

CT
CT

Out Door
Sensor (In)
Out Door
Sensor (Out)
Out Tank
Sensor (Out)
In Tank
Sensor (In)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

Wall Cradle
42

(Out)

Boiler On (In)

(In)
(Out)

10.0 Electrical

Intelligent Installations

10.8

S-Plan with DHW Cylinder sensor

Mains
Supply.

N
L

Isolate

Pump

gr
o

- Brown
- Orange
- Grey
- Blue
- Green/Yellow

Fused

2 Port Valve

8 8

Key
br
o
gr
b
g/y

Fused

CH1
br

Isolate

gr
o

2 Port Valve
DHW

br
b
g/y

N
L

(Out)

N
L

(Out)
(Out)

Boiler On (In)

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)
Valve

Valve

C/S
C/S

(Out)
(In)

Out Door
Sensor (In)
Out Door
Sensor (Out)
Cylinder
Sensor (In)
Cylinder
Sensor (Out)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

10.0 Electrical

Intelligent Installations

10.9

S-Plan with DHW Cylinder Thermostat

Mains
Supply.

N
L

Isolate

gr
o

- Brown
- Orange
- Grey
- Blue
- Green/Yellow

Fused

2 Port Valve

8 8

Key
br
o
gr
b
g/y

Pump

Fused

CH1
br

Isolate

gr
o

2 Port Valve
DHW

br
b
g/y

N
L

(Out)

N
L

(Out)

CH1
CH2

Wall Cradle
44

(On)
(On)

DHW(On)
DHW(Off)
Valve

Valve

CT
CT

Out Door
Sensor (In)
Out Door
Sensor (Out)
Out Tank
Sensor (Out)
In Tank
Sensor (In)
Back
1
Light (+12v)
Ground
2
(0V)
3
Data
Signal (+V)

(Out)

Boiler On (In)

(In)
(Out)

10.0 Electrical

Intelligent Installations

10.10

S-Plan with 2nd Heating Circuit

1. The appliance MUST have a permanent Live/Neutral/Earth
connection. The pump must be connected to the appliance as
shown.
2. Set parameter 5700 to ‘3’ for two heating circuits - see section
11.3.k.
3. To control the second heating circuit a second THINK
Controller is required – this is available as an optional extra. For
guidance on installing the second THINK Controller see section
11.3 paragraph k.
Use either a cylinder sensor or thermostat as in section 10.8&9.

Mains
Supply.

Key
o
- Orange
gr - Grey

N
L

Pump
8

Fused

Isolate

gr
o 2 Port
Valve

CH1
br

Isolate

8 8

Fused

gr
o 2 Port
Valve

N
L

Fused

CH2

(Out)

N
L

(Out)
(Out)

Boiler On (In)

br
br
Isolate

gr
2 Port
o Valve

DHW

Megaflo

b
g/y

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)
Valve

Valve

C/S
C/S

(Out)
(In)

Out Door
Sensor (In)
Out Door
Sensor (Out)
Cylinder
Sensor (In)
Cylinder
Sensor (Out)
Back
1
Light (+12v)
Ground 2
(0V)
3
Data
Signal (+V)

Wall Cradle

2nd Wall Cradle

10.0 Electrical

Retro Installations
NOTE: This installation is used only if the user wishes to utilise their existing temperature
and time controls.
Outside and DHW sensors cannot be used. The THINK Controller must remain on the
appliance.

10.11

Wiring Center

NOTE: As the boiler does not know what the actual room or
DHW temperature is, the boiler temperature is fixed at 80°C.
Appliance MUST have a permanent Live/Neutral/Earth
connection. Pump MUST be connected directly to the appliance.
System Requirement - The default for parameter 5700 (‘1’), is
setup to control through an external wiring centre. To check the
parameter - see section 11.3.k.
As an external programmer will be used to control the central
heating and domestic hot water times, the installer must make
sure that the boiler THINK Controller programs time for the
central heating and DHW are set to 24h on (see User Manual).

Mains
Supply.

N
L

Pump
8

Fused

External
Wiring
Centre

FusedFused

8 8
8 8

S - Plan System Components
Y - Plan System Components
W - Plan System Components

FusedFused

N
L

(Out)

N
L

(Out)
(Out)

Boiler On (In)

CH1
CH2

(On)
(On)

DHW(On)
DHW(Off)

Out Door
Sensor (Out)
Out Door
Sensor (In)
Out Tank
Sensor (Out)
In Tank
Sensor (In)
Back
Light (+12v)
CL +
Signal
CL Signal

Valve

C/S
C/S

(Out)
(In)

10.0 Electrical
Display showing all available segments

10.12

THINK Controller, 5 LED Receiver and Wall
Cradle Accessory (Figs. 42 & 43)
Display Descriptions
Burner in Operation 1 - Engine 2 - Supplementary
Heating to the Comfort Set Point
Heating to the Reduced Set Point

Outside
Temperature

Text 1
Text 2
Text 3

Central Heating Times Active
DHW Times Active
Combustion Check Function Active
Holiday Function Active
Manual Override - Time Switch Function Overridden

Boiler or Room
Temperature

Time Switch Function Active
Wireless Communication Established
THINK Controller Configured as a Room Sensor

Easy Menu Button
Standby Mode
Summer/Winter Mode
CH/DHW Temperatures

Error Message
Selector Button
Scrolling Options and Values
Selecting Options and Values

Stand By - Appliance On/Off

Menu Button
Programming
Options

Outdoor Sensor Connected

Fig. 42

System / Appliance Attention Required

THINK Controller

Maintenance / Special Mode
Change Battery (only if radio control fitted)

1st Green
LED

2nd Green
LED

1st Yellow
LED

2nd Yellow
LED

1. The THINK Controller is effectively an interface which allows
the householder to programme the appliance to provide the
desired comfort levels for the central heating and hot water. It also
gives information on the appliance – error codes electrical power
generated etc.

Red
LED

2. Whilst the THINK Controller is on the appliance the standard
screen displays the appliance flow temperature. External
sensors/room thermostats can be connected to monitor and
control the room and domestic hot water temperatures – see
sections 10.3 to 10.11.
3. The THINK Controller may be removed from the appliance and
configured as a programmable room sensor – in which case the
standard screen displays the room temperature.
4. If the THINK Controller is to be used as a room sensor it must
be configured so that the appliance will recognise it as such.

10.13

IMPORTANT: Before running the appliance ensure parameter
5700 has been set according to the type of system installed. See
sections 10.4 to 10.11 for system types and section 11.3.k for
the change procedure.

Reset Button

5 LED Receiver
5 LED Receiver (Fig. 43)
Inputs
Reset button: Used for user reset.
Outputs
1st Green LED
2nd Green LED
1st Yellow LED
2nd Yellow LED
Red LED
© Baxi Heating UK Ltd 2012

Mains On
Communication status
Engine burner status
Supplementary burner status
Fault status

To Configure the THINK Controller as a Room
Sensor

Fig. 43

1. To configure the THINK Controller to act as a room sensor
parameter 40 must be changed from Operator Unit 1 (the
appliance) to Room Unit 1 (room unit).
2. To access parameter 40
Press the Menu Button to reveal ‘Information’.
Press and hold Easy Menu and Menu Buttons until ‘Enduser’ is
revealed.
Turn the Selector Button to highlight ‘commissioning’ and
press to select.
Turn the Selector Button to highlight ‘operator section’ and
press to select.
Turn the Selector Button to highlight ‘Used as’ and press
to select, whilst flashing turn the Selector Button to show the
desired room unit and press to select.

10.0 Electrical
10.13

To Configure the THINK Controller as a Room
Sensor (cont)

3. Press the menu button repeatedly until the standard screen is
available. The Programmable Room Unit symbol should be shown
on the screen if the THINK Controller has been configured
correctly, see Fig. 42.

Wiring connections to appliance - see Section 16.6
Wired THINK Controller Wall Cradle Control Terminal Function
1 Power supply 12v
2 Ground (0v)
3 Data Signal (+v)

4. If a second THINK Controller is to be used to control either a
second heating circuit or to remain on the appliance then the
parameter settings are slightly altered, see Section 11.3 paragraph
k and Table 2.
5. To complete the reconfiguring the main PCB must be
rebooted with the information from the THINK Controller, so
switch off the appliance and then repower after 10 seconds. The
THINK Controller will now act as a programmable room sensor
when mounted into a wall cradle.
6. The THINK Controller’s can be replaced on the appliance at
any time but to avoid conflict and Error 84 address collision
problems, parameter 40 must be reconfigured back to
‘Operator Unit 1’.
7. When an THINK Controller is mounted in a wall cradle, the
5 LED Receiver fills the space on the appliance. It acts as an
indicator see fig. 43 and enables user resets to be carried out as
they cannot be performed remotely.

10.14
Data
Ground
Backlight
12 volt

(0v)

Signal
(<+12v)

To Install the 5 LED Receiver and THINK
Controller

1. Isolate the appliance.
2. Remove the 5-LED Receiver from the wall cradle (as supplied).
3. Connect the wire terminals between the room unit wall cradle
and the appliance controls installation area, using wire suitable for
12v. (<200m)

4. Install the wall cradle in a suitable room or hall way. (see
Section 10.15)
5. Make sure the wall cradle is not in a position where it can be
accidently knocked or tampered with.
6. Remove the THINK Controller from the appliance and place it
in the wall cradle.

Pull the THINK Controller to
unplug and fit in the Wall
Cradle

7. Place the 5-LED Receiver onto the appliance.
8. Switch on the appliance.
Wall Cradle

Fig. 44
Pull the 5 LED Receiver
to unplug and fit in the
appliance

9. If the THINK Controller has not been configured as a Room
Sensor correctly, you may see error 84: BSB collision. If this does
happen, repeat from Section 10.13 paragraph 2 while the
THINK Controller is on the wall cradle. Once the parameters
have been checked down power the appliance for 10 seconds
and then switch the appliance back on.

10.0 Electrical
10.15

Room Unit Installation Procedure

1. Room unit location: The wall cradle should be located in the
main living room while giving consideration to the following points:

Min. 200 mm

1500 mm

The place of installation should be chosen such that the
sensor can capture the room temperature as accurately as
possible without getting adversely affected by direct solar
radiation or other heat or refrigeration sources (about 1.5
meters above the floor) (Fig. 45).
There must be sufficient clearance around the unit, enabling it
to be fitted and removed.

Fig. 45

Important : A TRV should not be fitted to the radiator in the
same room as the room sensor. If a TRV has been installed on
this radiator, the TRV must remain set open at all times,
otherwise the house holder will experience room
temperature control problems.

10.16

Outside sensor unit installation procedure

1. Outside sensor location: The outside sensor carton is illustrated
with Suitable locations and advises against locations which are
likely to give poor / false readings.
2. Avoid south facing walls; preferably choose a west to north
facing location.
3. The ideal height for the sensor is at approximately half the
height of the living space of the dwelling and no less than 2.5m off
the ground.
4. Avoid locating the sensor close to the flue terminal where the
flue plume could heat the sensor and cause the appliance to
switch off prematurely.
5. Two core “bell wire” is suitable.
6. When correctly connected and once the ‘Save sensor’
procedure has been done (See Section 11.4), the outside
temperature and icon will be display on the THINK Controller
(See Section 10.12 and Fig 42).

10.0 Electrical
10.17

Wireless Installation

1. If a wireless system is being installed then communication
must be establish between the various RF components and the
special RF 5 LED Receiver which contains the transceiver for
the appliance. Each kit as outlined in section 6.8 includes
installation instructions. An overview is given below: -

NOTE: The THINK Controller refresh rate will be slower than when it is
mounted directly on the appliance or in a wired cradle.

2. In the wireless 5 LED kit (part no. 720026201) the wireless 5
LED Receiver and the cradle are prebound but subsequent
cradles holding THINK Controller for second heating circuits
must be connected or ‘bound’ to the 5 LED transceiver.

IMPORTANT: Before running the appliance ensure parameter 5700 has
been set according to the type of system installed. See sections 10.4 to 10.11
for system types and section 11.3.k for the change procedure.

3. The available RF component transmitters are: • The cradle – enables direct connection with the THINK
Controller.
• The outside sensor transmitter.
• The repeater unit – enables components to be positioned in
otherwise dead areas to the RF 5 LED Receiver. The repeater
unit requires a mains supply.
4. Observe the same considerations for locating the wireless
THINK Controller as the wired room sensor.
5. To bind the units together use the following procedures.
6. Each THINK Controller must be allocated to the correct heat
circuit i.e. room unit 1/room unit 2/operator unit as described in
Section 10.13 and 11.3 paragraph k, this can be done on the
appliance or later when in the RF cradle.
7. Switch the appliance on and insert the RF 5 LED Receiver
into either the appliance or an off appliance wired cradle.
8. If the RF Cradle and RF 5LED Receiver came boxed together
then they will be prebound. Insert the 3xAA batteries into the
RF cradle and insert the THINK Controller, ‘data update’ will
show and then the percentage progress will show if the
THINK Controller is new to the appliance. After a short while
‘Operator unit ready’ then the standard screen will appear. The
THINK Controller can now be used as an RF programmable
room sensor.

Wireless menu

1.
2.
3.
4.
5.
6.
7.
8.
9.

Line 2

Line 3

Binding
Test mode
Room Unit 1
Room Unit 2
Room Unit 3
Outside sensor
Repeater unit
Operator Unit 1
Delete all devices

Trigger?
Trigger?
Delete device?
Delete device?
Delete device?
Delete device?
Delete device?
Delete device?
-

Parameter
no/yes
no/yes
missing/in operation
missing/in operation
missing/in operation
missing/in operation
missing/in operation
missing/in operation
no/yes

120
121
130
131
132
133
134
135
140

9. If Error 83 appears move the THINK Controller in the RF
cradle closer to the RF 5 LED Receiver. If distance/line of sight is
not the problem the RF components will need to be connected
or ‘bound’ together using the following procedure: 10. Press and hold the reset button on the RF 5 LED Receiver
around 10 seconds until the second and fourth LEDS are lit.
11. Press the menu button to enter the user menu and then
press and hold the easy menu and menu buttons untill the
other access levels appear. Scroll down to the commissioning
option and select by pressing the Selector Button. Scroll down
to the wireless options and select to enter this list as shown
opposite.
12. Select parameter 120, scroll to ‘yes’. ‘Wait’ will appear until
the unit is bound. As each unit is bound they will appear in the
list above as being ‘in operation’. If a unit does not appear, move
it to a different location and then choose and confirm test
mode. This will initiate a series of 24 test signals which are
shown along the top of the display and sent back and shown on
a line underneath. Move the unit to a location where at least 20
of these signals are echoed back. If few or no signals are
received it will be necessary to use a repeater unit to relay the
signal.

11.0 Commissioning
11.1

Preliminary Electrical Checks

1. Reference should be made to BS:EN 12828, 14336 and 5449
Section 5 when commissioning the boiler.
2. Prior to commissioning the boiler preliminary electrical system
checks should be carried out.
3. Remove the outercase, the bottom panel and lower the
control tray to gain access to the electrical connections (see
section 10.1).

Top Centre Transit
Bracket

Fig. 48

4. These should be performed using a suitable meter, and include
checks for Earth Continuity, Resistance to Earth, Earth Loop
Impedance, Short Circuit and Polarity.
5. At the time of commissioning, complete all relevant sections of
the Benchmark Checklist at the rear of this publication.

11.2
Engine Alternator
removed for clarity to see
Transit Brackets

NOTE: The transit brackets - 3 off must only be removed
just before commissioning the appliance.
1. The engine is held securely for transit by 3 brackets (Figs. 48 &
49). To ensure that all 3 brackets are removed before firing the
appliance, two security measures must be overcome:

LH Bottom
Transit Bracket
Fig. 49

Commissioning the Boiler

RH Bottom
Transit Bracket

Remove Top Centre
Transit Bracket

a) Firstly all 3 brackets are wired together. Remove the bottom
(left and right hand) brackets first (Fig. 49) by removing the
screws from underneath the engine and then undo the M6
screws securing the brackets to the back of the appliance.
Disengage the brackets and withdraw.
Remove the top centre bracket by removing the three M5
screws (8mm spanner) (Fig. 48).
NOTE: Please retain the screws and brackets in case resiting
the appliance is necessary. The center bracket should also be
refitted to protect the engine head during servicing.
b) This will release the second security measure now that the
top bracket has been removed. The push on connector can be
disengaged from the cut out and reconnected to the return
temperature sensor (Figs. 48a & 48b) (the appliance will not
operate until this reconnection is made, Error 40 will show).

Push On Connector

Fig. 48a

When the Top Centre Transit Bracket has
been removed the push on connector can be
disengaged from the cut out and
reconnected to the return flow sensor..

2. Refit the control tray, the bottom panel and the outercase
before switching on the appliance.
3. Ensure that the filling loop is connected and open, then open
the heating flow and return valves on the boiler.
4. The system must be flushed in accordance with BS 7593 (see
Section 6.1) and the flushing agent manufacturers instructions.
5. Pressurise the system to 1.5 bar then close and disconnect the
filling loop.

Return Temperature
Sensor

Fig. 48b

Push On
Connector

6. Turn the gas supply on and purge the system according to in
GB BS 6891 (Natural Gas) BS 5482-1 (Propane Gas) and in IE
I.S. 813 “Domestic Gas Installations”.
IMPORTANT : Lockout may occur and Error Codes E261 &
E262 displayed if the gas supply pipe is not adequately
purged.
7. Test for gas tightness.

11.0 Commissioning
11.3

Commissioning of Controls

Every time the appliance is powered up, the controls carries out
2 checking functions
a) 315: Initialization – Main PCB gathers data on connections
and sensors. This takes around 2 minutes.
b) 312: Deaeration Function – all circulation valves are opened
and the circulating pump is exercised. On for 6 seconds off for 5
seconds for 4.5 minutes. See section g) Deaeration function
A number of actions are required to complete the
commissioning procedure.
Time and Date settings.
Operating mode
Temperature settings.
DHW set point for thermostat control.
Time Program settings.
Chimney sweep (checking the gas rates)
A number of commissioning actions may be required
(Paragraphs g to l):
Deaeration Function
Central Heating - Optimised start.
System frost protection (outdoor sensor required).
Legionella settings (DHW sensor only).
Configuring the appliance for the heating system –
Parameter 5700.
2nd Heating Circuit room unit allocation.
a) Date and Time Settings
When the THINK Controller is powered up initially, ‘Date and
Time’ setting function is activated. See Section 4.0 Setting the
Time in the User’s Operating Instruction Booklet.
b) Operating Mode
To avoid unnecessary/unwanted start ups during installation and
commissioning, the appliance is delivered in the standby mode
which is confirmed by the (
) symbol shown in section 10.12
Fig. 42. The standby mode will only allow the appliance to run if
either: Hot water boost has been selected.
Chimney sweep function has been activated.
Frost protection is activated for either the appliance or room.
Deaeration allows exercising of the pump and valves for priming
of the circuit and the removal of the air in the system.
To take the appliance out of standby and enable ‘normal’
operation: From the standard screen on the THINK Controller press the
easy menu button.
Scroll the Button and press to select Standby/operation.
‘Standby/operation – Operation’ appears briefly on the THINK
Controller and the action is confirmed by the disappearance of
the standby symbol.
The central heating and domestic hot water active times are
shown at the top of the THINK Controller as shown in
fig. 42. (See paragraph e).
To set up the appliance to the modes of operation required for
the householder see Section 7.0 of the User’s Operating Instructions.
Section 7.1 Selecting the Space Heating Mode.
Section 7.4 Selecting the DHW Mode.
c) Temperature Settings.
Please refer to the User’s Operating Instructions Section 7.0.

11.0 Commissioning
11.3

Commissioning of Controls (cont)

d) DHW set point for thermostat control.
Remember: Make sure the user DHW setpoint on the THINK
Controller is equal to or greater than the set point on the
thermostat at the cylinder.
If this procedure is not performed the recovery time of the DHW
maybe be increased unacceptably.
e) Time Program Setting
Please refer to the User’s Operating Instructions Section 5 (CH)
and Section 6 (DHW).
f) Chimney Sweep - Checking the gas rates - see Section 11.5.
g) Deaeration function
If during commissioning repeated E164 and E274 errors occur
which will stop the appliance from running, (see section 17 fault
finding) it may be useful to run the Deaeration function. This will
run the pump and exercise the system valves to help purge the
air from the system.
• To activate this function from the standard screen: • Press and hold both the easy menu and menu buttons until
chimney sweep function appears.
• Deaeration function will appear shortly afterwards.
• Scroll down and press to select.
• ‘312: Deaeration function’ will appear and last for 41/2 mins.
This action can be used repeatedly until the 164 and 274 errors
are removed. However if the problem persists check to see if
shut off valves, pump valves, wiring etc are correct.
h) Central Heating - Optimum start activation
The engine and supplementary burners are fired so that the
property is up to the set room temperature at the programme
On time.
• To activate the function press the ‘Menu’ button to enter the
programming menu.
• Press and hold ‘Easy Menu’ and ‘Menu’ button together untill
the access level menu appears (>8sec).
• Select ‘Commissioning’.
• Select ‘Temps/mode CH1’.
• Press Selector Button to confirm.
• Select ‘Optimum start control max’ (P 790).
• Press Selector Button.
• Change the values to the desired time.
• Press Selector Button to confirm.
• Press ‘Menu’ button to escape to the normal operating screen.
i) System Frost protection
An outdoor sensor must be fitted to activate system frost
protection.
• To activate the function press the ‘Menu’ button to enter the
programming menu - ‘Information’ appears.
• Press and hold ‘Easy Menu’ and ‘Menu’ button together until
the access level menu appears (>8sec).
• Select ‘Commissioning’.
• Select ‘Configuration’.
• Select ‘System frost protection’ (P 6120).
• Press Selector Button.
• Select ‘On’.
• Press Selector Button to confirm.
• Press ‘Menu’ to escape to normal operating screen.
Remember: The function is most likely to activate the pump
during the night. Pump activation at less than 1.5° C.

11.0 Commissioning
11.3

Commissioning of Controls (cont)

j) Legionella
Legionella is only possible if DHW cylinder sensor is used.
The function default activation time is ‘Monday at 8:00am’.
• To modify the legionella time press ‘Menu’ button to enter
the programming menu.
• Scroll to and select ‘Domestic Hot Water’.
• Scroll to and select ‘Legionella function weekday’
• Change and confirm new day.
• Select ‘Legionella funct time’.
• Change and confirm new time.
k) Configuring the appliance for the heating system – Parameter
5700.
The default setting for parameter 5700 is ‘1’ is for a retro-efficient
system with a switched live using a wiring centre – see section
10.11.
For intelligent installations change parameter 5700 to: ‘2’ - for one heating circuit and ‘3’ - for two heating circuits.
From the main screen press the menu button to show
‘information’.
• Press and hold the easy menu and menu buttons until ‘end
user’ appears.
• Turn the selector button to highlight ‘commissioning’ and
press to select.
• Turn the selector button to highlight ‘Presetting parameter
5700’ and press to select.
• Whilst the existing parameter is flashing turn the selector
button to the desired number and press to select.
Press the menu button repeatedly to return to the standard
screen.
Parameter settings for the THINK Controller when used as a room sensor with
either a 5LED Receiver or THINK Controller on the appliance
1st Room Unit

On the Appliance

2nd Room Unit
Parameter

5LED

RU1

All HC

Central

RU2

THINK Controller

RU1

All HC

Central

RU2

Automatically
Assigned

Table 2

Reprogramming of location and central control parameters. The default
settings used for the THINK Controller on the appliance regardless of other
equipment are :Parameters
40 = Operator Unit 1
42 = All Heating Circuits (All HC)
43 = Central
The parameters 42 and 43 are accessed as parameter 40 as above.

l) 2nd Room Unit Allocation Procedure
When two or more THINK Controller’s are used as opposed to
one THINK Controller with a 5 LED Receiver.
Install the wall cradles and connect to the appliances using the
same connections as shown in Fig. 44 – up to two THINK
Controllers can be installed in this way.
Power up the appliance:
• After the standard screen appears press the menu Button to
reveal ‘Information’.
• Press and hold the Easy Menu and the Menu Button until
‘User’ appears.
• Turn the Selector Button to highlight ‘Commissioning’ and
press to select.
• Turn the Selector Button to highlight ‘Operator unit’ parameter 40 and press to select.
• Turn the Selector Button to highlight ‘Room unit 2’ and press
to select.
• Parameter 42 and 43 are automatically assigned and not
accessible.
• Press the Menu Button repeatedly to escape to the standard
screen.
Down power the appliance for ten seconds and then power up.
If two heating circuits have been programmed correctly the
THINK Controller’s should show a small 1 and 2 next to the
radiator along with the room unit symbol as in Fig. 42.
If it is required to replace the THINK Controller back on the
appliance then parameter 40 must be reassigned to operator unit
1 - see section 10.13.

After all reprogramming of these parameters the appliance must
be down powered and then repowered after 10 seconds.

11.0 Commissioning
11.4

Saving the sensor connections

1. For intelligent installations where sensors are used, after all of
the connections are made and all the THINK Controller’s have
been programmed as room sensors, the sensor connections need
to be saved.
2. From the main screen: • Press the Menu Button to reveal ‘Information’.
• Press and hold Easy Menu + Menu for 5 seconds to reveal
‘user’.
• Turn the Selector Button to highlight ‘commissioning’ and press
to select.
• Turn the Selector Button to highlight ‘configuration’ and press
to select.
• Turn the Selector Button to highlight ‘save sensors’ and press
to select.
• Turn the Selector Button to highlight ‘yes’ and press to select.
• The ‘yes’ will change back to ‘no’ to show that the sensors have
been saved.
3. The sensors that are connected to the appliance are
automatically recognised and used to control the comfort levels.

11.0 Commissioning
11.5

Starting the Appliance and Checking the Gas Rate

1. The gas valve is factory set and in normal running the burner
pressure cannot be measured as it is controlled by the fan and
modulates as demand on the boiler alters.
2. The gas rate must be checked (as in accordance with Gas
Regulation 98 Paragraph 26/9) with any other appliances and pilot
lights turned off.
3. The gas rate measurement may be made with the Engine and
Supplementary burners both on maximum.
Approximate rate is:- ±5% 2.68 m3/hr at 20mb inlet pressure for
G20 (Natural Gas) 1.04 m3/hr at 37mb inlet pressure for G31
(Propane Gas), see Section 4.1. NOTE: For retro-fit systems using
a wiring centre - ensure that all external controls are calling for
heat.

04. November
Tuesday

2008

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.

08:50

4. 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:

Menu
Button
Easy Menu
Button

Selector Button
THINK Controller

Fig. 49a
STEP 1

STEP 2

--------------------------------------------------Chimney sweep function
Deaeration function

STEP 3

5. Activate the chimney sweep function by pressing and holding
the easy menu and menu buttons (Fig. 49a) whilst in the normal
operation screen untill chimney sweep function option appears.
Press the Selector Button to switch the chimney sweep function
on.
Chimney sweep function
On

6. The THINK Controller will show Chimney Sweep Function on.
Chimney Sweep function Burner Output Adjust appears.
• Press the Selector Button. ‘Engine burner min’ will flash.
• Use the wheel to scroll through the six options
a) Engine burner minimum
b) Engine burner maximum
c) Supplementary burner minimum
d) Supplementary burner maximum
e) Engine and Supplementary burners minimum
f) Engine and Supplementary burners maximum

303:Chimney sweep function
Burner output
Eng + Supp bu max

7. Choose the maximum operation f) and ok your choice. No
matter what the previous state is, the burners will restart
before achieving the desired rate. As soon as both burners are lit
as shown by the flame numbers
.

STEP 4

303:Chimney sweep function
Burner output
Eng burner min

Adjust?

8. With the boiler operating in the maximum rate condition check
that the operational (working) gas pressure at the inlet gas
pressure test point (Fig. 50) is in accordance with B.S. 6798 & B.S.
6891.
9. Ensure that this inlet pressure can be obtained with all other gas
appliances in the property working.

11.0 Commissioning
11.5

Starting the Appliance and Checking the Gas
Rate (cont)

10. Carry out the rate measurement. The burners will remain
at maximum rate unless: a) A fault condition occurs – the burner/s will switch off
– depending on the fault.
b) The boiler set flow condition is reached (see note) –
the burners will switch off.
c) The power generated reaches 1kW - the engine
burner will modulate down.
For this reason the measurement needs to be carried out on
a cold system to be sure of obtaining an accurate result.
NOTE: The boiler set flow temperature is set to 90° to
avoid interruption of the rate measurement.
11. The chimney sweep function can be deactivated in the
same manner as it is activated. It will deactivate automatically
after 20 minutes, or in the event of an fault.
12. Remember: The engine burner will not restart until the
Head Temperature is below 165°C.

12.0 Completion
12.1

Completion

1. Instruct the user in the operation of the boiler and system
including the THINK Controller, explaining the operational
sequence.
2. Set the central heating and hot water temperature comfort
levels to the requirements of the user.
3. Carefully read and complete all sections of the Benchmark
Commissioning Checklist at the rear of this publication that
are relevant to the appliance and installation. These details
may be required in the event of any warranty work. The
publication must be handed to the user for safe keeping and
each subsequent regular service visit recorded.
4. Complete the ‘Notice of Installation’ booklet and submit on
the day of commissioning to the Distribution Network
Operator.
5. 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.
6. Hand over the Users Operating, Installation and Servicing
Instructions giving advice on the necessity of regular servicing.
Advise the customer of the necessity of informing the
electricity provider with regard to billing and payback. See
the Users Operating instructions section 13.3.
NOTE: See also
www.baxi.co.uk/products/get-fit-with-baxi-ecogen

13.0 Servicing
13.1

1. For reasons of safety and economy, it is recommended that the
appliance is serviced annually. Servicing must be performed by a
competent person in accordance with BS 7967-4:2007.

Throttle
Adjustment Screw
(cover removed)

2. After servicing, complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at the rear of
this publication.
NOTE: Service and maintenance engineers must have
undergone Baxi Ecogen Training and been approved to service
this appliance.

PINT

Inlet Test
Pressure Point
Fig. 50

General

Gas Valve

3. Before electrically isolating the appliance: remove all demands
for heat and ensure the engine has disconnected from the grid.
(Power = 0 kW) This will protect the engine from the stresses
produced by disconnecting during electricity generation.
IMPORTANT: During routine servicing, and after any
maintenance or change of part of the combustion circuit, the
following must be checked:• The integrity of the complete flue system and the flue seals.
• The integrity of the boiler combustion circuit and relevant
seals as described in Section 14.14.
• The operational gas inlet pressure as described in Section
11.5 and the gas rate as described in 11.3.8.
• The combustion performance as described in ‘Check the
Combustion Performance’ (15.1).
4. Competence to carry out Checking Combustion Performance
- B.S. 6798 ‘Specification for Installation & Maintenance of Gas
Fired Boilers not exceeding 70kW’ advises that:• The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas
analyser and the interpretation of the results.
• The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers’ requirements.
• Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which covers the
use of electronic portable combustion gas analysers in
accordance with BS 7967, Parts 1 to 4.
NOTE: It is not possible to undertake any servicing of the engine
and its burner and as such it should be regarded as a sealed unit.
When performing combustion checks each burner must be run
independently, see section 15.0 Combustion Checks.

13.2

Power generation

1. Ensure the system is cold and use the chimney sweep mode to
force the Engine burner to maximum rate see section 15.1.
2. Use the THINK Controller to observe the power generated.
3. Monitor the head temperature and the power via the I-think
controller -see section 13.3 -safety note.
4. The power should be between 800 to 1000W within 10
minutes of the engine burner starting - the head temperature
should be between 450-500 deg C.
5. If the power level is low when the head has reached
temperature the engine is not producing power correctly - see
section Q for fault finding on the engine.

13.0 Servicing
13.3

Servicing - Internal Integrity

Safety Note: Before removing the front cover; the correct
shut down sequence must be followed for your own safety.
Before servicing, ensure that the boiler is cool with the
engine head below 120°C – otherwise there is a risk of
electric shock even with the supplies disconnected. The head
temperature may be accessed via the THINK Controller.
Press the MENU Button. Turn the Selector Button to highlight
‘Information’. Press the Button to select. Turn Selector Button
until ‘head temp actual value’ is shown.
Ensure that both the gas and electrical supplies to the
appliance are isolated - wait a minimum of 6 minutes 30
seconds before any work is started - again there is a risk of
electric shock even with the supplies disconnected.
NOTE: Before undertaking any service work that entails the
removal and replacement of parts, ensure that the center
transit bracket is refitted to protect the engine head (see
Fig.48). This bracket must then be removed before running
the engine.
1. Remove the plastic facia on the front of the appliance which is
held on by two magnets (Fig. 51).
2. Remove the two screws and the front case by pulling forward
at the bottom edge and then lifting clear of the engagement at the
top of the appliance (Fig. 51).
Plastic
Fascia

Fig. 51
Bottom Cover

3. Undo the four screws from the bottom cover and remove the
cover (Fig. 51).
4. Remove the two screws on the front of the control tray to gain
access to the control tray area (Fig. 52).
5. Inspect the unit for any signs of water damage and rectify any
leaks.
6. Generally check the conditions of the wiring of the appliance
and the external wiring for and loose/ poor connections and
remake if necessary.

Fig. 52

Control Cover

Control Tray

7. Inspect the condition of the condense trap for signs of debris
and possible blockage. If necessary remove the service plug, drain
and clean the compartment. Replace the plug, reassemble the
case and check for correct operation when the appliance is
running.
8. Check and clean the magnetic filter if it is of the serviceable
type, otherwise replace the cartridge. If it observed that there is
excessive amounts of corrosion product - black residue/sludge
check the inhibitor level in the system and top up with inhibitor
solution as required.

13.0 Servicing
13.4

Servicing – Combustion and Rate Checks

1. Perform combustion and rate checks by using the chimney
sweep mode to force each burner into maximum rate (see
section 15.0 Combustion Checks). Combustion reading of
CO2 ~ 8.7 – 9.3 and CO less than 100 ppm are acceptable for
both burners. Measure the CO/CO2 ratio. This valve must be
less than 0.004.

Gaskets

2. Set each burner separately to a minimum and check that the
burner stays lit with clean combustion.

Igniter
Electrode

3. If there is a problem with the rate or combustion see Section
15.2.
4. If there is a problem with the ignition, the following servicing
should be carried out.

Sensing
Electrode

See SAFETY NOTE Section 13.3
Engine Ignition and Flame Sensing Electrodes (Fig. 53)
1. Detach the ignition and flame sense leads from the wiring
harness noting their positions.
Fig. 53

2. Undo the long nuts (7mm spanner) retaining the engine
ignition and flame sense electrodes.
3. Carefully withdraw the electrodes from the engine.
4. Examine and clean or replace the electrodes as necessary. The
spark gap should be 3.5 - 4.0 mm, adjust the earth pin if required
(Fig. 54).
3.5 - 4.0mm

5. Always use the new gaskets provide when replacing the
electrodes.
6. Replace in the reverse order.
Supplementary Burner and Heat Exchanger, Igniter and Flame
Sensing Electrodes (Fig. 55)
1. Detach the supplementary Igniter plug.

Fig. 54

Igniter Plug

2. Detach the flame sense lead from the wiring harness.
3. Remove the four M5 screws at the right of the supplementary
air gas manifold.

Ignition
Electrode
Lead

4. Undo the six nuts around the burner door perimeter noting
the position of the earth lead.
5. Carefully with draw the burner door and manifold.
6. Clean any debris form the heat exchanger and check that the
gaps between the tubes are clear.
7. Inspect the burner, insulation and the electrodes, clean or
replace if necessary. Reset the electrode spark gap to between
3.5 – 4.0 mm by adjusting the earth pin if required (Fig. 54).

Electrode Leads
Burner Door
Nuts

8. If it is necessary to replace electrodes always use the gaskets
provided.
M4 Screw
Flame Sense
Lead

Fig. 55

9. Reassemble in the reverse order remembering to attach the
earth wire.
Complete the relevant Service Interval Record section of the
Benchmark Commissioning Checklist at the rear of this
publication and then hand it back to the user.

Baxi Ecogen Installation Instructions 1 7210659 Install

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