Baxi MainEco Combi 24 Manual

These instructions include the Benchmark Commissioning Checklist and should be left with the
user for safe keeping. They must be read in conjunction with the Flue Installation Guide.
United Kingdom
en
24-28-35 / 18-24
Installation and Service Manual
Wall Mounted Gas Condensing Boiler
Baxi MainEco Combi and System

Dear customer,
Thank you for purchasing this appliance.
Please read this manual carefully before using the product and keep it in a safe place for future reference.
In order to ensure continued safe and efficient operation we recommend that the product is regularly maintained. Our Service
and After Sales organization can assist with this.
We hope you will receive many years of satisfactory service.

Contents
1.1 Building Regulations and the Benchmark
Commissioning Checklist ....................................6
1.2 The Benchmark Scheme ......................................6
1.3 Installer Notification Guidelines ..........................7
2Introduction ................................................................................................8
2.1 Symbols used .......................................................8
2.2 Abbreviations ........................................................8
2.3 General ..................................................................8
2.3.1 Manufacturer’s liability .............................................8
2.3.2 Installer’s liability .....................................................9
2.3.3 User’s liability ..........................................................9
2.4 Homologations ....................................................10
2.4.1 Certifications .........................................................10
2.4.2 Additional Directives ..............................................10
3 Safety instructions and recommendations ............................................11
3.1 Safety instructions .............................................11
3.2 Recommendations ..............................................11
4 Technical description ..............................................................................13
4.1 General description ............................................13
4.2 Main parts ............................................................13
4.3 Skeleton Diagrams .............................................14
4.4 Operating principle .............................................14
4.4.1 Gas/air setting .......................................................14
4.4.2 Combustion ...........................................................15
4.4.3 Heating and domestic hot water production ..........15
4.4.4 Control system ......................................................15
4.4.5 Adjustment ............................................................15
4.4.6 Regulation of the water temperature .....................16
4.4.7 Protection against low water or no
circulation ..............................................................16
4.4.8 Overheat temperature protection ..........................16
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4.5 Circulating pump (Available pump head) .........16
4.6 Technical specifications ....................................17
5 Installation ................................................................................................19
5.1 Regulations governing installation ...................19
5.2 Choice of the location ........................................20
5.2.1 Type plate .............................................................20
5.2.2 Location of the boiler .............................................20
5.3 Main dimensions .................................................22
5.4 Positioning the boiler .........................................23
5.5 Hydraulic connections .......................................23
5.5.1 Flushing the system ..............................................24
5.5.2 Water flow rate ......................................................24
5.5.3 Connection of the heating circuit ...........................24
5.5.4 Connection of the water circuit for domestic
use ........................................................................25
5.5.5 Connecting the expansion vessel .........................25
5.5.6 Connecting the safety valve discharge pipe ..........26
5.5.7 Connecting the condensate discharge pipe ..........26
5.5.8 Automatic air bleed ...............................................28
5.6 Gas connection ...................................................29
5.7 Connections for the air and exhaust
pipes ....................................................................29
5.7.1 Classification .........................................................29
5.7.2 Outlets ...................................................................30
5.7.3 Lengths of the air/flue gas pipes ...........................31
5.7.4 Additional Directives ..............................................32
5.7.5 Connection of the combustion gas exhaust
pipe .......................................................................32
5.8 Electrical connections ........................................32
5.8.1 Control unit ............................................................32
5.8.2 Recommendations ................................................33
5.8.3 Access to the connector block / Boiler HMI ...........34
5.8.4 Connection options ...............................................34
5.9 Electrical diagram ...............................................38
5.10 Filling the system ...............................................38
5.10.1 Water treatment ....................................................38
5.10.2 Filling the condensate trap ....................................39
5.10.3 Filling the system ..................................................40
5.10.4 Venting the system ................................................41
Contents
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6 Commissioning ........................................................................................42
6.1 Control panel .......................................................42
6.2 Check points before commissioning ................43
6.2.1 Preparing the boiler for commissioning .................43
6.2.2 Hydraulic circuit .....................................................43
6.2.3 Electrical connections ...........................................43
6.3 Commissioning the boiler ..................................43
6.4 Gas settings ........................................................45
6.4.1 Gas circuit .............................................................45
6.4.2 Checking combustion ............................................45
6.4.3 Setting the air/gas ratio .........................................48
6.5 Finalizing work ....................................................49
6.6 Parameter descriptions ......................................50
7 Switching off the boiler ............................................................................52
7.1 Installation shutdown .........................................52
7.2 Antifreeze protection ..........................................52
8 Checking and maintenance .....................................................................53
8.1 General instructions ...........................................53
8.2 Standard inspection and maintenance
operations ...........................................................53
8.2.1 Open the boiler ......................................................53
8.2.2 Checking the hydraulic pressure ...........................54
8.2.3 Checking the expansion vessel .............................54
8.2.4 Checking the ionization current .............................54
8.2.5 Checking the DHW transfer capacity ....................55
8.2.6 Checking the flue gas discharge and the air
supply ....................................................................55
8.2.7 Checking combustion ............................................55
8.2.8 Checking the automatic air vent ............................55
8.2.9 Checking the condensate trap ..............................56
8.2.10 Checking the burner and cleaning the heat
exchanger .............................................................57
8.3 Specific maintenance operations ......................58
8.3.1 Replacing the ionization/ignition electrode ............58
8.3.2 Replacing the 3-way valve ....................................59
8.3.3 Cleaning the plate heat exchanger .......................59
8.3.4 Cleaning the domestic water cartridge ..................60
8.3.5 Replacement of the expansion vessel ..................60
8.3.6 Re-assembling the boiler ......................................61
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9 Troubleshooting .......................................................................................63
9.1 Error codes ..........................................................63
9.2 Shutdowns and lock-outs ..................................63
9.2.1 Blocking .................................................................63
9.2.2 Lock out .................................................................65
10 Spare parts ................................................................................................70
10.1 General ................................................................70
10.2 Spare parts ..........................................................70
11 Appendix ...................................................................................................71
11.1 User instruction card ..........................................71
11.2 Gas boiler system commissioning
checklist ..............................................................72
11.3 Service record .....................................................73
Contents
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02092014 - 7619497-02 5
EC declaration of conformity
The device complies with the standard type described in the EG
declaration of conformity. It was manufactured and commissioned in
accordance with European directives.
The original declaration of conformity is available from the
manufacturer.

1.1 Building Regulations and the Benchmark Commissioning Checklist
Building Regulations (England & Wales) require
notification of the installation of a heating appliance to the
relevant Local Authority Building Control Department.
This can be achieved via a Competent Persons Self
Certification Scheme as an option to notifying the Local
Authority directly.
The Health & Safety Executive operates the ’Gas Safe
Register’, a selfcertification scheme for gas heating
appliances.
This company is a member of the Benchmark initiative
and fully supports the aims of the programme. Its aim is
to improve the standards of installation and
commissioning of central heating systems in the UK and
to encourage the regular servicing of all central heating
systems to ensure safety and efficiency.
Building Regulations require that installations should
comply with manufacturer’s instructions. It is therefore
important that the commissioning checklist is completed
by the installer. The relevant section of Building
Regulations only relates to dwellings. Therefore the
checklist only applies if the appliance is being installed in
a dwelling or some related structure.
The flowchart opposite gives guidance for installers on the
process necessary to ensure compliance with Building
Regulations.
1.2 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.
R000725-A
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1.3 Installer Notification Guidelines
R000696-01
Choose Building
Regulations Notification
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
and will issue a
certificate of compliance
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Competent Person's
Self Certification Scheme
Building Control
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
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02092014 - 7619497-02 7

2 Introduction
2.1 Symbols used
In these instructions, various danger levels are employed to draw the
user’s attention to particular information. In so doing, we wish to
safeguard the user’s safety, highlight hazards and guarantee correct
operation of the appliance.
DANGER
Risk of a dangerous situation causing serious physical
injury.
WARNING
Risk of a dangerous situation causing slight physical
injury.
CAUTION
Risk of material damage.
Signals important information.
¼Signals a referral to other instructions or other pages in the
instructions.
2.2 Abbreviations
4LTH: Low temperature heating
4DHW: Domestic hot water
4HRU: Heat Recovery Unit
4PCU: Primary Control Unit - Electronic system to control burner
function
4SCU: Secondary Control Unit - Additional electronic system
2.3 General
2.3.1. Manufacturer’s liability
Our products are manufactured in compliance with the requirements
of the various applicable European Directives. They are therefore
delivered with [ marking and all relevant documentation.
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In the interest of customers, we are continuously endeavouring to
make improvements in product quality. All the specifications stated in
this document are therefore subject to change without notice.
Our liability as the manufacturer may not be invoked in the following
cases:
4Failure to abide by the instructions on using the appliance.
4Faulty or insufficient maintenance of the appliance.
4Failure to abide by the instructions on installing the appliance.
2.3.2. Installer’s liability
The installer is responsible for the installation and commissioning of
the appliance. The installer must respect the following instructions:
4Read and follow the instructions given in the manuals provided
with the appliance.
4Carry out installation in compliance with the prevailing legislation
and standards.
4Perform the initial start up and carry out any checks necessary.
4Explain the installation to the user.
4If a maintenance is necessary, warn the user of the obligation to
check the appliance and maintain it in good working order.
4Give all the instruction manuals to the user.
2.3.3. User’s liability
To guarantee optimum operation of the appliance, the user must
respect the following instructions:
4Read and follow the instructions given in the manuals provided
with the appliance.
4Call on qualified professionals to carry out installation and initial
start up.
4Get your installer to explain your installation to you.
4Ensure the Appliance is serviced in accordance with the
manufacturer’s instructions by a suitable qualified person.
4Keep the instruction manuals in good condition close to the
appliance.
This appliance is not intended to be used by persons (including
children) whose physcial, sensory or mental capacity is impaired or
persons with no experience or knowledge, unless they have the
benefit, through the intermediary of a person responsible for their
safety, of supervision or prior instructions regarding use of the
appliance. Care should be taken to ensure that children do not play
with the appliance.
If the mains power lead is damaged it must be replaced by the original
manufacturer, the manufacturer’s dealer or another competent
person to prevent hazardous situations.
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02092014 - 7619497-02 9

2.4 Homologations
2.4.1. Certifications
CE identification no PIN 0063CM3019
NOx classification 5 (Standards EN)
Type of connection (Flue gas outlet) C13, C33, C53
Gas Council number MainEco Combi 24: 47–075–93
MainEco Combi 28: 47–075–94
MainEco Combi 35: 47–075–95
MainEco System 18: 41–470–13
MainEco System 24: 41–470–14
2.4.2. Additional Directives
Apart from the legal provisions and Directives, the additional
Directives described in these instructions must also be observed.
For all provisions and Directives referred to in these instructions, it is
agreed that all addenda or subsequent provisions will apply at the
time of installation.
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3 Safety instructions and
recommendations
3.1 Safety instructions
DANGER
If you smell gas:
1. Do not use a naked flame, do not smoke, do not
operate electrical contacts or switches ( doorbell,
light, motor, lift, etc..).
2. Shut off the gas supply.
3. Open the windows.
4. Report any leaks immediately.
5. Trace possible leaks and seal them immediately.
6. If the gas leak is before the gas meter, contact the
gas supplier.
DANGER
If you smell flue gases:
1. Switch the appliance off.
2. Open the windows.
3. Report any leaks immediately.
4. Trace possible leaks and seal them immediately.
3.2 Recommendations
WARNING
4Installation and maintenance of the boiler must be
carried out by a qualified professional in compliance
with prevailing local and national regulations.
4When working on the boiler, always disconnect the
boiler from the mains and close the main gas inlet
valve.
4After maintenance or repair work, check all
installations to ensure that there are no leaks.
CAUTION
The boiler must be installed in a frost-free environment.
Keep this document close to the place where the boiler is
installed.
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02092014 - 7619497-02 11

Casing components
Only remove the casing for maintenance and repair operations. Put
the casing back in place after maintenance and repair operations.
Instructions stickers
The instructions and warnings affixed to the appliance must never be
removed or covered and must remain legible during the entire lifespan
of the appliance. Immediately replace damaged or illegible
instructions and warning stickers.
Modifications
Modifications may only be made to the boiler after the written
permission of BAXI to do so.
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4 Technical description
4.1 General description
Wall-hung gas condensing boilers
4High efficiency heating.
4Low pollutant emissions.
4Installation and connection facilitated by the mounting frame
delivered with the appliance.
4Flue gas discharge via a forced flue or chimney type connection.
4Baxi MainEco Combi 24 - 28 - 35: Heating and domestic hot
water production.
4Baxi MainEco System 18 - 24: Heating only.
4.2 Main parts
1Flue gas outlet/Air intake (Combustion air/flue gas
adapter 60/100)
2Casing/air box
3Outlet for measuring combustion gases
4Ignition/ionization electrode
5Flue gas discharge pipe
6Gas/air system with a fan, gas block and automatic burner
unit
7Air intake silencer
8Plate heat exchanger (DHW) (Only for Combi models)
9Connection box
10 Condensate trap
11 Circulation pump
12 3-way valve
13 Primary heat exchanger
14 Expansion vessel
15 Automatic air vent
T004783-A
3
5
6
7
9
8
13
12
14
15
11
10
1
2
4
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4.3 Skeleton Diagrams
Combi 24 - 28 - 35
1Primary heat exchanger
2Hydroblock
3Plate heat exchanger (DHW)
4Safety valve
5Heating flow
6Domestic hot water outlet (DHW)
7Domestic cold water inlet
8Heating return
9Circulation pump (Central heating)
10 3-way valve
System 18 - 24
1Primary heat exchanger
2Safety valve
3Heating flow
4Heating return
5Circulation pump (Central heating)
4.4 Operating principle
4.4.1. Gas/air setting
The casing fitted to the boiler is also used as an air box. Air is sucked
in by the fan and gas injected into the venturi by the fan intake. The
fan rotation speed is set according to the settings parameters, the
thermal energy requirement and the temperatures measured by the
temperature sensors. The gas and air are mixed in the venturi. The
gas/air ratio ensures that the quantities of gas and air are adjusted to
each other. This provides optimum combustion on the entire output
range. The gas/air mixture is fed into the burner on top of the
exchanger.
T003393-D
5 6 7 8
1
2
3
4
10
9
T003807-A
3 4
1
2
5
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14 02092014 - 7619497-02

4.4.2. Combustion
The burner heats the heating water circulating in the heat
exchanger. At a return temperature lower than around 55°C, the flue
gases cool down to a temperature lower than the dew point, thus
causing the condensation of the water vapour contained in the flue
gases in the lower section of the heat exchanger. The heat released
during this condensation process (the latent heat or condensing heat)
is also transferred to the heating water. The cooled combustion gases
are evacuated via the combustion gas outlet flue. The condensation
water is evacuated via a condensate trap.
4.4.3. Heating and domestic hot water production
On combi boilers, an integrated plate exchanger heats the domestic
water. A 3-way valve determines whether the heated water is fed into
the heating system or the plate exchanger. A pick-up sensor signals
that a hot water tap is being opened. This signal is transmitted to the
control panel, which then switches the 3-way valve to the hot water
position and trips the heating pump. The 3-way valve is spring-loaded
but only consumes electricity when it switches to another position.
The heating water reheats the domestic water in the plate
exchanger. In comfort mode, if there is no hot water draw-off, the
boiler handles the periodic reheating of the plate exchanger. Any
limescale particles are kept out of the plate exchanger by a self-
cleaning water filter (self-cleans once every 76 hours).
4.4.4. Control system
Control of the boiler ensures reliable delivery of heat. This means that
the boiler treats external negative influences in a practical manner
(notably when the water-flow is insufficient or there are problems with
air supply). In the presence of such influences, the boiler doesn’t
switch into locking mode, but first reduces his power and, depending
on the nature of the circumstances, will be temporarily out of service
(blocking or stop). The boiler will continue to supply heat as long as
the situation does not become dangerous.
4.4.5. Adjustment
The power of the boiler can be adjusted in the following ways:
4On/Off setting
The output between the minimum and maximum values varies
based on the heating flow set point temperature.
4Adjustable control
The output between the minimum and maximum values varies
based on the heating flow temperature determined by the
modulating control system.
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02092014 - 7619497-02 15

4.4.6. Regulation of the water temperature
The boiler is fitted with an electronic temperature regulator having an
outlet and return temperature probe. The flow temperature can be set
between 20°C and 90°C. The boiler reduces its power when the set
outlet-temperature is attained. The cutout temperature is the set
heating outlet-temperature + 5 °C.
4.4.7. Protection against low water or no
circulation
The boiler is fitted with a safety device to prevent the shortage of water
based on temperature measurements. By reducing its output when
the water flow rate is in danger of becoming insufficient, the boiler
continues to operate as long as possible. In case of insufficient ΔT
≥ 50°C flow or an excessive increase in flow temperature, the boiler
will enter shutdown mode for 10 minutes. When there is no water in
the boiler, or if the pump is not running, the system is locked
(breakdown)
In the event of a fault, the status signal for the B button on
the connection box flashes red.
¼For more detailed information, see chapter: "Shutdowns and
lock-outs", page 63.
4.4.8. Overheat temperature protection
The maximum temperature protection locks the boiler if the water
temperature becomes too high (110°C).
In the event of a fault, the status signal for the B button on
the connection box flashes red.
¼For more detailed information, see chapter: "Shutdowns and
lock-outs", page 63.
Anticycle function is active when heat demand is active and
the flow temperature is too high with respect to the
setpoint. The anticycle time can be active between 3
and 9 minutes depending on system temperatures.
4.5 Circulating pump (Available pump head)
The boiler is fitted with an on/off circulation pump.
1 Combi 24 - 28
2 Combi 35
HManometric height central heating circuit
QWater flow ( ΔT=20K)
R000684-A
12001000600 800400200
0
0
100
200
300
400
500
600
Q (l/h)
16001400
700
H (mbar)
1250
30 kW
317
1500
860 1030
20 kW
24 kW
253
127
1
2
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16 02092014 - 7619497-02

System 18
HManometric height central heating circuit
QWater flow ( ΔT=20K)
System 24
HManometric height central heating circuit
QWater flow ( ΔT=20K)
4.6 Technical specifications
Boiler type MainEco Combi 24 Combi 28 Combi 35 System 18 System 24
General
EC indentification no. PIN 0063CM3019
Input control Adjustable Modulating, Start/Stop
Nominal output (Pn)
Heating System (80/60 °C)
min - max kW 5.5 - 19.5 5.5 - 23.4 7.7 - 29.2 5.5 - 17.7 5.5 - 23.4
Factory setting kW 19.5 19.5 29.2 17.7 23.4
Nominal output (Pn)
Heating System (50/30 °C)
min - max kW 6.1 - 20.9 6.1 - 24.8 8.5 - 31.0 6.1 - 18.8 6.1 - 24.8
Factory setting kW 20.9 20.7 31.0 18.8 24.8
Nominal output (Pn)
DHW System
min - max kW 5.5 - 23.4 5.5 - 27.5 7.7 - 33.9 - -
Factory setting kW 23.4 27.5 33.9 - -
Nominal input (Qn)
Heating System (Hi)
min - max kW 5.6 - 20.0 5.6 - 24.0 7.8 - 30.0 5.6 - 18.0 5.6 - 24.0
Factory setting kW 20.0 20.0 30.0 18.0 24.0
Nominal input (Qn)
Heating System (Hs)
min - max kW 6.2 - 22.2 6.2 - 26.7 8.7 - 33.3 6.2 - 20.0 6.2 - 26.7
Factory setting kW 22.2 22.2 33.3 20.0 26.7
Nominal input (Qnw)
DHW System (Hi)
min - max kW 5.6 - 24.0 5.6 - 28.2 7.8 - 34.9 - -
Factory setting kW 24.0 28.2 34.9 - -
Nominal input (Qnw)
DHW System (Hs)
min - max kW 6.2 - 26.7 6.2 - 31.3 8.7 - 38.8 - -
Factory setting kW 26.7 31.3 38.8 - -
Heating efficiency under full load (Hi) (80/60 °C) % 97.6 97.6 97.2 98.2 97.6
Heating efficiency under full load (Hi) (50/30 °C) % 104.5 103.3 103.3 104.5 103.3
Heating efficiency under partial load (Hi)
(Return temperature 60°C) % 97.8 97.8 98.4 97.8 97.8
Heating efficiency under partial load (Hi) (92/42
EEG) (Return temperature 30°C) % 109.2 109.2 108.8 109.3 109.2
SEDBUK 2005 - 2009 % 90.4 - 89.4 90.3 - 89.3 90.1 - 89.1 90.4 - 89.4 90.3 - 89.3
Data on the gases and combustion gases
Equipment categories - I2H
Type of air/flue gas connection - C13, C33, C53
Gas inlet pressure G20 min - max mbar 17 - 23
Connecting pressure G20 mbar 20
Gas consumption G20 max m3/h 2.54 2.98 3.68 1.90 2.54
NOx annual emission (n=1) mg/kWh 53 58 52 41 58
Mass flue gas flow rate maximum kg/h 9.4 - 38.7 9.4 - 45.5 13.1 - 56.2 9.4 - 29.1 9.4 - 38.7
(1) Front panel removed
R000685-A
12001000600 800400200
0
0
100
200
300
400
500
600
H (mbar)
Q (l/h)
16001400
775
18 kW
280
R000365-A
12001000600 800400200
0
0
100
200
300
400
500
600
H (mbar)
Q (l/h)
16001400
860 1030
20 kW
24 kW
253
127
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02092014 - 7619497-02 17

Boiler type MainEco Combi 24 Combi 28 Combi 35 System 18 System 24
Flue gas temperature min - max °C 32 - 78 32 - 84 31 - 82 32 - 65 32 - 78
Maximum counter pressure Pa 80 116 105 - 80
Characteristics of the heating circuit
Water content l 1.6 1.6 1.7 1.4 1.4
Water operating pressure minimum bar 0.8 0.8 0.8 0.8 0.8
Water operating pressure (PMS) maximum bar 2.5 2.5 2.5 2.5 2.5
Water temperature maximum °C 110 110 110 110 110
Operating temperature maximum °C 90 90 90 90 90
Manometric height central heating circuit (ΔT = 20K) mbar 253 127 317 280 275
Characteristics of the domestic hot water circuit
Specific hot water flow Rate 35 °C Rise l/min 9.8 11.4 14.3 - -
Domestic water resistance (without flow restrictor) mbar 96 123 215 - -
Flow rate threshold minimum l/min 1.2 1.2 1.2 - -
Water content l 0.16 0.16 0.18 - -
Operating pressure (Pmw) maximum bar 8 8 8 - -
Electrical characteristics
Power supply voltage VAC 230 230 230 230 230
Power consumption - Full load maximum W 105 117 145 92 103
Power consumption - Part load maximum W 82 82 101 82 82
Power consumption - Standby maximum W 3 3 3 3 3
Electrical protection index IP X4D
Other characteristics
Weight (empty) Total kg 26 26 28.5 25 24.5
Mounting(1) kg 24 24 27 23 23
Acoustic level at 1
metre
maximum Heating System dB(A) 38 38 42 38 40
maximum DHW System dB(A) 40 42 45 - -
(1) Front panel removed
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