BAXI 424 Combi 2 High Efficiency Wall Hung Condensing Gas Boiler User Guide
- June 9, 2024
- BAXI
Table of Contents
424 Combi 2 High Efficiency Wall Hung Condensing Gas Boiler
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the following is the text from the user manual / instructions:
United Kingdom
en
User Guide High-efficiency wall-hung condensing gas boiler
424 Combi 2 – 430 Combi 2 424 Combi LPG 2 – 430 Combi LPG 2
Please keep these instructions in a safe place. If you move house, please hand
them over to the next occupier.
Dear Customer,
Thank you very much for buying this appliance. Please read through the manual
carefully before using the product, and keep it in a safe place for later
reference. In order to ensure continued safe and efficient operation we
recommend that the product is serviced regularly. Our service and customer
service organisation can assist with this. We hope you enjoy years of problem-
free operation with the product.
7
4
400 Combi 2
1 Safety
General safety instructions
Fig.1 Taps ON and OFF A B
PN-0000367
1 Safety
Danger This boiler can be used by children aged 8 years and above and by
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge when they have been given supervision or instruction
concerning the safe use of the device and understand the resulting risks.
Children must not be allowed to play with the appliance. Cleaning and user
maintenance must not be carried out by children without supervision.
United Kingdom
en
User Guide High-efficiency wall-hung condensing gas boiler
424 Combi 2 – 430 Combi 2 424 Combi LPG 2 – 430 Combi LPG 2
Please keep these instructions in a safe place. If you move house, please hand
them over to the next occupier.
Dear Customer,
Thank you very much for buying this appliance. Please read through the manual
carefully before using the product, and keep it in a safe place for later
reference. In order to ensure continued safe and efficient operation we
recommend that the product is serviced regularly. Our service and customer
service organisation can assist with this. We hope you enjoy years of problem-
free operation with the product.
1.1 General safety instructions
Fig.1 Taps ON and OFF A B
PN-0000367
1 Safety
Danger This boiler can be used by children aged 8 years and above and by
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge when they have been given supervision or instruction
concerning the safe use of the device and understand the resulting risks.
Children must not be allowed to play with the appliance. Cleaning and user
maintenance must not be carried out by children without supervision.
Danger If you smell gas:
1. Turn off the gas supply at the meter. 2. Open windows and doors in the
hazardous area. 3. Do not operate light switches. 4. Do not operate any
electrical equipment. 5. Do not use a telephone in the hazardous area. 6.
Extinguish any naked flame and do not smoke. 7. Warn any other occupants and
vacate the premises. 8. Telephone the National Gas Emergency Service on:- 0800
111 999.
Important If a water or gas leak occurs or is suspected, the boiler can be isolated at the inlet valves by turning their taps through 90° (1/4 turn) downwards.
A
ON
B
OFF
For advice please contact your Installer, Annual Service Provider or Baxi Customer Support – The Service Division of Baxi. You can contact Baxi Customer Support on telephone number 0344 871 1545. When contacting Baxi Customer Support it will be useful to have the “Benchmark Checklist ” at the back of the Installation & Service Manual to hand as it includes details relevant to the boiler and installation.
Warning Do not touch flue/chimney pipes. Depending on the settings of the appliance, the temperature of flue/chimney pipes may exceed 60 °C. Do not touch radiators for long periods. Depending on the settings of the appliance, the temperature of radiators may reach 85 °C. Take precautions with domestic hot water. Depending on the settings of the appliance, domestic hot water temperature may reach 65 °C.
Caution Do not neglect to service the appliance. Contact a qualified professional or take out a maintenance contract for the annual servicing of the appliance.
400 Combi 2
5
1 Safety
1.2 Recommendations
Caution
Only qualified professionals are authorised to work on the boiler and the
installation. The appliance has an integral frost protection mode as long as
there is power to the boiler.
Important
Regularly check the water pressure in the system (recommended pressure is 1.5
bar). Keep the appliance accessible at all times. Do not remove or cover the
user information and serial number labels affixed to the boiler control flap.
They must remain legible throughout the lifetime of the boiler.
1.2.1 The Benchmark Scheme
Baxi Heating UK Ltd is a licensed member of the Benchmark Scheme which aims to
improve the standards of installation and commissioning of domestic heating
and hot water systems in the UK and to encourage regular servicing to optimise
safety, efficiency and performance.
Benchmark is managed and promoted by Heating and Hotwater Industry Council.
For more information visit www.centralheating.co.uk
1.2.2 Benchmark Commissioning Checklist
Please ensure that the installer has fully completed the Benchmark Checklist
on the inside back pages of the installation instructions supplied with the
product and that you have signed it to say that you have received a full and
clear explanation of its operation. The installer is legally required to
complete a commissioning checklist as a means of complying with the
appropriate Building Regulations (England and Wales).
All installations must be notified, by the installer, to Local Area Building
Control either directly or through a Competent Persons Scheme. A Building
Regulations Compliance Certificate will then be issued to the customer who
should, on receipt, write the Notification Number on the Benchmark Checklist.
This product should be serviced annually to optimise its safety, efficiency
and performance. The service engineer should complete the relevant section of
the Benchmark Service Record in the Installation & Service manual after each
service.
The completed Benchmark Checklist & proof of annual servicing (where
applicable) will be required in the event of any warranty work.
6
400 Combi 2
1.3 Liabilities
1 Safety
1.3.1 User’s liability
To guarantee optimum operation of the system, you must abide by the following
instructions:
Read and follow the instructions given in the manuals provided with the
appliance. Call on a qualified professional to carry out installation and
initial commissioning. Get your installer to explain your installation to you.
Have the required inspections and maintenance carried out by a qualified
installer. Keep the instruction manuals in good condition close to the
appliance.
1.3.2 Installer’s liability
The installer is responsible for the installation and initial commissioning of
the appliance. The installer must observe the following instructions:
Read and follow the instructions given in the manuals provided with the
appliance. Install the appliance in compliance with prevailing legislation and
standards. Carry out initial commissioning and any checks necessary. Explain
the installation to the user. If maintenance is necessary, warn the user of
the obligation to check the appliance and keep it in good working order. Give
all the instruction manuals to the user.
1.3.3 Manufacturer’s liability
Our products are manufactured in compliance with the requirements of the
various Directives applicable. They are therefore delivered with the marking
and any documents necessary. In the interests of the quality of our products,
we strive constantly to improve them. We therefore reserve the right to modify
the specifications given in this document. Our liability as manufacturer may
not be invoked in the following cases: Failure to abide by the instructions on
installing and maintaining the appliance. Failure to abide by the instructions
on using the appliance. Faulty or insufficient maintenance of the appliance.
400 Combi 2
7
2 About this manual
2 About this manual
2.1 General
2.2 Additional documentation 2.3 Symbols used
2.4 Abbreviations/glossary
8
400 Combi 2
Warning Installation, repair and maintenance must only be carried out only by
a competent person.
All Gas Safe registered engineers carry an ID card with their licence number
and a photograph. You can check your engineer is registered by telephoning
0800 408 5500 or online at
www.gassaferegister.co.uk
This manual is intended for the user of the Baxi 400 Combi 2 boiler. If the
appliance is sold or transferred, or if the owner moves leaving the appliance
behind you should ensure that the manual is kept with the appliance for
consultation by the new owner and their installer.
The appliance is designed as a boiler for use in residential domestic
environments on a governed meter supply only. The selection of this boiler is
entirely at the owner’s risk. If the appliance is used for purposes other than
or in excess of these specifications, the manufacturer will not accept any
liability for resulting loss, damage or injury.
The manufacturer will not accept any liability whatsoever for loss, damage or
injury arising as a result of failure to observe the instructions for use,
maintenance and installation of the appliance.
Various timers, external controls, etc. are available as optional extras. Full
details are contained in the relevant sales literature.
2.3.1 Symbols used in the manual
This manual uses various danger levels to draw attention to special
instructions. We do this to improve user safety, to prevent problems and to
guarantee correct operation of the appliance.
Danger Risk of dangerous situations that may result in serious personal
injury.
Danger of electric shock Risk of electric shock.
Warning Risk of dangerous situations that may result in minor personal injury.
Caution Risk of material damage.
Important Please note: important information.
See Reference to other manuals or pages in this manual.
CH
DHW PCU Pnc SU
Central heating
Domestic hot water PCB for managing burner operation Condensing output Safety
PCB
Technical specifications
3.1 Homologations
Tab.1 Certifications UKCA certificate number NOx class Boiler type
748363 6 C13, C33
3.1.1 Certification
3 Technical specifications
3.2 Technical data
3.2.1 Technical information
Important All data in these sections are nominal and subject to normal pro duction tolerances.
Tab.2 Technical settings for combination heaters with boilers
Baxi Combi 2
424
430
424 LPG 430 LPG
Gas Council numbers Condensing boiler Low-temperature boiler(1)
B1 boiler
Cogeneration space heater
Combination heater
Rated heat output Useful heat output at rated heat output and high temperature
setting (2)
Prated P4
47-077-51 47-077-52 47-077-53 47-077-54
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
kW
20
20
20
20
kW
20
20
20
20
Useful heat output at 30% of rated heat out-put and
low temperature setting(1)
P1
kW
6.7
6.7
6.7
6.7
Seasonal space heating energy efficiency
s
%
93
93
93
93
Useful efficiency at rated heat output and high temperature setting(2)
4
%
88.2
88.0
88.2
88
Useful efficiency at 30% of rated heat output and low temperature setting(1)
1
%
97.9
97.8
97.9
97.8
Auxiliary electricity consumption
Full load
elmax
kW
0.037
0.026
0.037
0.026
Partial load
elmin
kW
0.014
0.014
0.014
0.014
Standby mode
PSB
kW
0.004
0.004
0.004
0.004
Other items
Heat loss on standby
Pstby
kW
0.04
0.04
0.04
0.04
Ignition burner power consumption
Pign
kW
–
–
–
–
Annual energy consumption
QHE
GJ
62
62
62
62
Sound power level, indoors
LWA
dB
50
49
50
49
Nitrogen oxide emissions
NOx mg/kWh
24
21
21
21
Domestic hot water parameters
Declared load profile
XL
XL
XL
XL
Daily electricity consumption
Qelec
kWh
0.176
0.189
0.176
0.189
Annual electricity consumption
AEC
kWh
39
42
39
42
Water heating energy efficiency
wh
%
88
89
88
89
Daily fuel consumption
Qfuel
kWh
22.03
21.66
22.03
21.66
Annual fuel consumption
AFC
GJ
17
17
17
17
(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C return temperature (at heater inlet). (2) High temperature setting means 60 °C return temperature at boiler inlet and 80 °C flow temperature at boiler outlet
400 Combi 2
9
3 Technical specifications
Tab.3 General
Rated heat input (Qn) for domestic hot water Rated heat input (Qn) with
domestic hot water tank Rated heat input (Qn) for heating Reduced heat input
(Qn) 80/60 °C Rated heat output (Pn) for domestic hot water Rated heat output
(Pn) with domestic hot water tank Rated heat output (Pn) 80/60 °C for heating
Rated heat output (Pn) 50/30 °C for heating Reduced heat output (Pn) 80/60 °C
Reduced heat output (Pn) 50/30 °C Rated efficiency 50/30 °C (Hi)
Tab.4 Characteristics of the heating circuit
Maximum pressure Minimum pressure Temperature range for heating circuit Water
capacity of expansion vessel
Tab.5 Characteristics of the domestic water circuit
Minimum pressure Maximum pressure Minimum dynamic pressure Minimum water flow
Specific flow (D) Temperature range for domestic water circuit Domestic water
production with T = 25 °C Domestic water production with T = 35 °C
Tab.6 Combustion characteristics
G20 gas consumption (Qmax) G20 gas consumption (Qmax) with domestic hot water
tank G20 gas consumption (Qmin) G31 propane gas consumption (Qmax) G31 propane
gas consumption (Qmin) Diameter of separate discharge pipes Diameter of
coaxial discharge pipes Flue gas mass flow rate (max) Flue gas mass flow rate
(max) with domestic hot water tank Flue gas mass flow rate (min)
Tab.7 Electrical characteristics
Power supply voltage Power supply frequency Rated electric power Rated
electrical output with domestic hot water tank
424
430
424 LPG 430 LPG
kW
24.7
30
24.7
30
kW
–
–
kW
20.6
20.6
20.6
20.6
kW
4.9
6.0
4.9
6
kW
24
29.1
24
29.1
kW
–
–
kW
20
20
20
20
kW
21.8
21.8
21.8
21.8
kW
4.8
5.8
4.8
5.8
kW
5.2
6.3
5.2
6.3
%
105.8
105.8
105.8
105.8
424
430
424 LPG 430 LPG
bar
2.5
2.5
2.5
2.5
bar
0.5
0.5
0.5
0.5
°C
25 – 80
25 – 80
25 – 80
25 – 80
l
7
7
7
7
bar bar bar l/min l/min °C l/min l/min
424
0.8 8.0 0.15 2.0 11.5 35 – 60 13.8 9.8
430
0.8 8.0 0.15 2.0 14 35 – 60 16.7 11.9
424 LPG
0.8 8 0.15 2 11.5 35 – 60 13.8 9.8
430 LPG
0.8 8 0.15 2 14 35 – 60 16.7 11.9
m3/h m3/h
m3/h
kg/h kg/h mm mm kg/sec kg/sec kg/sec
424
2.61
0.52
80/80 60/100 0.011
0.002
430
3.17 –
0.63
80/80 60/100 0.014
0.003
424 LPG
2.61
0.52 1.92 0.38 80/80 60/100 0.011
0.002
430 LPG
3.17 –
0.63 2.33 0.47 80/80 60/100 0.014
0.003
424
V
230
Hz
50
W
90
W
430
424 LPG 430 LPG
230
230
230
50
50
50
90
90
90
–
–
10
400 Combi 2
Tab.8 Other characteristics
Humidity protection rating (EN 60529) Net weight when empty/filled with water
Dimensions (height/width/depth)
3 Technical specifications
424
430
424 LPG 430 LPG
IP
X5D
X5D
X5D
X5D
kg
28/30
29/31
28/30
29/31
mm 700/395/285 700/395/285 700/395/285 700/395/285
Fig.2 Dimensions and connections
3.2.2 Dimensions and connections/clearances
700 mm
395 mm
285 mm
1
24 5
3
6
7
BO-0000199-1
1
Safety valve
2
Heating circuit flow fitting (G3/4″)
3
Fitting for condensate discharge
4
DHW (Domestic Hot Water) outlet fitting (G1/2″)
5
Gas inlet fitting (G3/4″)
6
Domestic cold water inlet fitting (G1/2″)
7
Heating circuit return fitting (G34″)
400 Combi 2
11
4 Description of the product
4 Description of the product
4.1 General description
4.2 Operating principle
The purpose of this gas-fuelled condensing boiler is to heat water to a
temperature that is lower than boiling point at atmospheric pressure. It must
be connected to a heating installation and to a domestic hot water
distribution system that is compatible with its power and performance ratings.
Features of this boiler:
Low pollutant emissions, High-efficiency heating, Front control panel with
display, Lightweight and compact.
4.2.1 Air-gas adjustment
The air is drawn in by the fan and gas injected directly at the height of the
venturi. The fan revolution speed is regulated automatically by the electronic
board based on the adjustment settings. The gas and air are mixed in the
manifold. The gas/air ratio ensures that the quantity of gas and air are
adjusted correctly to always obtain optimal combustion. The gas/air mixture is
fed into the burner at the front of the exchanger. Here, the electric igniter
triggers the mixture with a series of sparks that burn, producing thermal
energy.
4.2.2 Combustion
The burner heats the heating water circulating in the heat exchanger. When the
temperature of the combustion gas is lower than the dew point (around 55 °C),
the water vapour contained in the combustion gas condenses in the flue gas
side of the heat exchanger. The heat recovered during this condensation
process (the latent heat or condensing heat) is also transferred to the
heating water. Once cooled, the combustion gases are discharged through the
exhaust pipe. The condensed water is discharged through a siphon.
4.2.3 Heating and domestic hot water production
In boilers used for heating and for producing domestic hot water, an
integrated plate heat exchanger heats the domestic water. The heated water is
then channelled to the heating installation or to the plate heat exchanger via
a three-way valve. A flow sensor detects that a hot water tap has been turned
on and communicates this to the PCB, which switches the three-way valve to the
hot water position and activates the pump. The three-way valve is spring-
loaded and only consumes electricity when switching from one position to
another. Precedence is given to a heat request in domestic water mode.
12
400 Combi 2
4.3 Control panel description
Fig.3 Control panel Fig.4 Display screen
4.4 Accessories & options
4 Description of the product
4.3.1
Description of the control panel
Knobs
HEATING: Using this knob you can modify the flow temperature for the heating
installation (heating setpoint 25-80 °C).
turn the knob anti-clockwise to reduce the temperature or to the left to
scroll through the menus. With an outside sensor connected it is possible to
limit the setpoint value; turn the knob clockwise to increase the temperature
or to the right to scroll through the menus.
DOMESTIC HOT WATER: Using this knob you can modify the domestic hot water
temperature (DHW setpoint 35-60 °C) or scroll through the menus to the left
and right:
turn anti-clockwise to reduce the temperature. turn clockwise to increase the
temperature.
Icons Chimney sweep mode is enabled (forced full load or low load for CO2
measurement). The burner is on. Display of the system water pressure. DHW
operation is enabled. CH operation is enabled.
Information menu: read out various current values. User menu: user-level
parameters can be configured.
Installer menu: installer-level parameter can be configured. Error menu:
errors can be read out. Counter menu: various counters can be read out.
Buttons Back (previous menu) Manual reset Menu Confirms selection or value.
1 Chimney sweep mode: Press the Back and Manual reset keys simultaneously.
Consult the sales catalogue for all available accessories and options.
400 Combi 2
13
5 Operation
5 Operation
5.1 Start-up
Fig.5 Scrolling through the menus and/or settings
F1 F2 F3 F4
BO-7763705-1
Fig.6 Scrolling through the menus and/or settings
5.1.1 Procedure for first start-up
The following information appears on the display when the boiler is electrically powered:
1. The message “INIT”” appears, indicating that the “Initialisation” phase is
active (a few seconds);
2. The software version “Vxx.xx.” appears (two seconds); 3. The software
version for boiler settings “Pxx.xx.” appears (two
seconds); 4. The boiler and heating installation venting phase has started.
During
operation, the display shows in alternate mode “ ”, the word
“DEAIR” and the pressure value for the heating circuit. This phase lasts 6
minutes and 20 seconds, at the end the boiler is ready for operation;
5. The appear.
symbol and the “x.x” installation water pressure value
In the event of a power outage the procedure will be repeated from the beginning. To activate a heating request, the room thermostat must be set to a temperature above the current temperature (or open a domestic water tap.)
5.1.2 Changing the heating flow temperature
1. Use the knob to adjust the flow temperature in heating mode. Turn the knob
anti-clockwise to reduce the temperature value. Turn the knob clockwise to
increase the temperature value.
Important With an outside sensor connected it is possible to lower the
setpoint value.
2. Press the F4 key to confirm the value or wait a few seconds until the
value is automatically saved.
Important The flow temperature on the display automatically matches the
temperature set when using a:
Weather-dependent regulator. OpenTherm regulator.
5.1.3 Changing the domestic hot water (DHW) temperature
1. Use the knob to adjust the domestic hot water temperature. Turn the knob
anti-clockwise to reduce the temperature value. Turn the knob clockwise to
increase the temperature value.
2. Press the F4 key to confirm the value or wait a few seconds until the
value is automatically saved.
F1 F2 F3 F4
BO-7763705-2
14
400 Combi 2
5.2 Shutdown 5.3 Frost protection
5 Operation
5.2.1 Switching off the heating and domestic hot water (DHW)
Heating mode can also be disabled by turning the until the word OFF appears on the display.
knob anti-clockwise
Important When heating mode is re-enabled check, by turning the knob, that the comfort temperature is that requested.
Important Heating is disabled but the frost protection function remains
activated.
Domestic hot water mode can also be disabled by turning the
knob anti-clockwise until the word OFF appears on the display.
To switch the boiler off completely, switch off the power supply to the
appliance and close the gas cock.
Important In this condition, the boiler and the heating installation are not
protected against frost.
It is a good idea to prevent the heating installation from draining
completely, as changing the water can result in unnecessary and damaging
limescale deposits from forming inside the boiler and heating elements. If the
thermal installation is not intended to be used during the winter months and
there is a risk of frost, we recommend mixing suitable antifreeze solutions
designed for a specific purpose (e.g. propylene glycol, which contains
limescale and corrosion inhibitors) into the water in the installation. The
boiler’s electronic control system is equipped with an “antifreeze” function
for the heating system. This function activates the boiler pump when the
heating system flow temperature falls below 7 °C. If the water temperature
reaches 4 °C, the burner is switched on, bringing the system water to a
temperature of 10 °C. When this value is reached the burner switches off and
the pump continues to operate for another 3 minutes.
Important The frost protection function will not work if there is no power
being supplied to the boiler or if the gas supply cock is closed.
400 Combi 2
15
6 Settings
6 Settings
6.1
Fig.7
Access to USER parameters
Accessing the user parameters
To display/modify the list of USER parameters, proceed as follows:
press the + keys simultaneously, the symbol bar starts to flash;
on the menu
turn the knob until the appears. Press the key to confirm;
turn the knob until you reach the required setting. Press the key
to confirm; modify the value of the parameter using
knob;
the Press the key to confirm;
Press the key to exit.
Important The factory settings for certain settings may differ based on the market the product is destined for.
6.2 List of USER parameters
Tab.9 Table of parameters
Name Description
Factory value
CH operation
AP016 0: Off
1
1: On
Domestic hot water (DHW)
AP017 0: Off
1
1: On
AP073
Average external temperature [°C] when switching from summer/ winter mode (with outside sensor)
22
Force summer mode (with outside sensor)
AP074 0: Auto according to AP073
0
1: Summer
Anti-legionella function
DP004
0: Disabled 1: Weekly
0
2: Daily (only available with Room Unit)
Domestic hot water temperature setpoint. DP070 In the case of operation with a
calorifier tank and programming via 60
room unit corresponding to the comfort setpoint [°C]
DP200
DHW mode:
0: Domestic hot water programming (only available with Room Unit)
1: Manual (boiler with calorifier tank) Preheating active (instanta neous boiler)
2
2: Antifreeze (boiler with calorifier tank) No preheating (instantane
ous boiler)
Mini mum
Maxi mum
Level User
10
30
User User User
User
35
60
User
User
16
400 Combi 2
6 Settings
Tab.10 Name
CP060
CP070
CP080 CP081 CP082 CP083 CP084 CP085 CP200 CP250
CP320
Settings table with eMO Life
Description
Required ambient temperature (°C) in the zone in the holiday/anti freeze
period Maximum ambient setpoint temperature (°C) in reduced mode that enables
switching to comfort mode with climate control (with outside sensor)
Temperature (°C) set by SLEEP activity in the zone Temperature (°C) set by
HOME activity in the zone Temperature (°C) set by AWAY activity in the zone
Temperature (°C) set by MORNING activity in the zone Temperature (°C) set by
EVENING activity in the zone Temperature (°C) set by CUSTOM activity in the
zone Required ambient temperature (°C) for the zone in manual mode Correct the
temperature measured by the room unit Zone operating mode 0: Scheduling 1:
Manual 2: Off
Factory value 6
16
16 20 6 21 22 20 20 0
0
Mini mum
5
Maxi mum
20
5
30
5
30
5
30
5
30
5
30
5
30
5
30
5
30
-5
+5
Level
User
User
User User User User User User User User
User
CP510 CP550
CP570
DP060 DP080 DP337
Temporary room setpoint per zone
20
Fireplace mode
0: Disabled
0
1: Enabled
Timer programme selected by User
0: Program 1 1: Program 2
0
2: Program 3
Timer programme selected for DHW
0: Program 1 1: Program 2
0
2: Program 3
Reduced temperature setpoint for the domestic hot water tank [°C] 35
Domestic hot water temperature setpoint for the holiday period [°C] 10
5
30
User
User
User
10
60
10
60
User
User User
Important The factory values of some parameters may differ according to the target market of the product.
400 Combi 2
17
Maintenance
7.1 General
7.2 Maintenance instructions
Fig.8 Water pressure
The boiler does not require any special maintenance. However, the boiler must
be serviced annually in accordance with the Installation and Service Manual
and the relevant section of the Benchmark Service Record com pleted in order
to maintain the warranty.
Note Taking out a maintenance contract is recommended.
Caution Maintenance operations must be performed by a qualified compe tent
person. Use only BAXI genuine spare parts.
The painted panels should be wiped with a damp cloth and then dried
completely. DO NOT USE ABRASIVE CLEANING AGENTS.
To ensure continued safety, functionality and efficiency, the boiler must be
inspected annually by the installer/service engineer in order to ensure the
performance of the product constant over time, we recommend having the
boiler’s energy efficiency checked annually by a qualified technician.
Accurate maintenance is always a reason for safety and savings in the
management of the system. Periodically check that the pressure shown on the
display with the system cold is between 1 – 1.5 bar. If it is lower, act on
the system filling tap. It is advisable that the opening of this tap is
carried out very slowly in order to facilitate degassing.
Important The boiler is equipped with a hydraulic pressure switch which does
not allow the boiler to operate in case of low pressure. If frequent pressure
drops should occur, call the installer/ service engineer
7.2.1 Filling the installation
If the water pressure is too low, the system must be re-pressurised. The
normal operating water pressure is between 1 and 2 bar. If the pres sure
exceeds 3 bar the safety pressure valve will operate and a fault is in
dicated. Ensure that the temporary filling loop is disconnected. Contact your
installer. It may be necessary to repressurise the system occasionally (when
the water pressure falls below 0.7). A filling device (the filling loop) will
be fitted on the system. This will be on the boiler itself, or on pipework
near to the boiler. Seek advice from your installer.
Note If the water pressure requires regular re-pressurising a fault or leak is
indicated. Seek advice from your installer.
18
400 Combi 2
Fig.45 Filling loop
7 Maintenance
PN-0000260
1. Fully open one of the taps first, and then while watching the pres sure
gauge, carefully open the second tap. Note The system pressure is shown at all
times on the display when there is power to the boiler.
2. When the figures on the display indicate between 1 and 1.5 bar turn both
taps off.
3. Disconnect the filling pipe from the taps (a small amount of water may be
present) and remove it. Keep the pipe in a safe place for fu ture use.
4. If blanking caps are available fit them to the taps. Note Go to the “How
to videos” section of the “Advice” page at www.baxi.co.uk for further details.
5. When the correct pressure is restored the boiler will reset automati
cally.
Fig.10 Venting the installation A
1
B
C1 C D
BO-0000026
7.3 Maintenance message
Fig.11 Maintenance message
4
3 2
Venting the installation
It is essential to eliminate any air in the boiler, pipes or fittings because
this can cause irritating noise during heating or the intake of water. To do
this, proceed as follows:
1. Open the valves (A & B) of all the radiators connected to the central
heating system.
2. Set the ambient thermostat as high as possible. 3. Wait for the radiators
to heat up. 4. Set the ambient thermostat as low as possible. 5. Wait about 10
minutes until the radiators have cooled down. 6. Vent the radiators. Start
with the lower floors. 7. Open the vent valve (C & C1) holding a cloth (D)
against the valve. 8. Wait until water comes out of the vent valve and then
tighten it
again. 9. After venting, check that the system is still at sufficient
pressure.
Important Take care as the water might still be hot.
Important If the hydraulic pressure of the water in the central heating system
is below 0.8 bar, it is advised to increase the pressure (the recommended
hydraulic pressure is 1.0 – 1.5 bar).
The purpose of this function is to warn the user that the boiler requires maintenance.
When the letters SVC appear on the screen and the symbol the boiler requires maintenance. Contact your installer.
flashes,
400 Combi 2
19
Troubleshooting
8 Troubleshooting
8.1 Temporary and permanent faults
The codes on the display indicate two types of fault: volatile and permanent.
The first item shown on the display is a letter followed by a two-digit
number. The letter indicates the type of fault: temporary (H) or permanent
(E). The number indicates the group in which the fault that has occurred is
classified according to its impact on safe and reliable operation. The second
item shown flashes alternately with the first and consists of a two-digit
number that indicates the type of fault which has occurred (see the following
fault tables). TEMPORARY FAULT (A/H.x.x.) A temporary fault is shown on the
display by the letter “A” or “H” followed by a number (group). A temporary
fault is a type of fault that does not cause a permanent stoppage of the
boiler. It has the following characteristics: A: The appliance continues to
operate. It disappears as soon as the cause has been resolved. H: Disappears
when the error condition is removed, in some cases even after 10 minutes.
PERMANENT FAULT (E.x.x) A permanent fault is shown on the display by the
letter “E” followed by a number (group). Press the RESET button for one
second. If faults are shown frequently, contact our authorised technical
assistance centre. E: Stoppage, reset required..
8.2 Error codes
Tab.11 List of temporary faults
DISPLAY Group Specific DESCRIPTION OF TEMPORARY FAULTS code code
H.00 .42
Pressure sensor open/faulty
H.01 .00
Temporary communication failure in the PCB
H.01 .05
Maximum temperature difference value between flow and return reached.
H.01 .08
Flow temperature increase in heating mode too quick.
H.01 .14
Maximum flow or return temperature value reached.
CAUSE Check/Solution An installer is required for most checks and solu
tions.
SENSOR/CONNECTION PROBLEM Check the operation of the pressure sensor Check the
sensor/PCB connection
The error is resolved automatically
INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a
manual venting cycle Check the installation pressure OTHER CAUSES Check the
cleanliness of the exchanger Check the operation of the temperature sensors
Check the temperature sensor connection
INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a
manual venting cycle Check the installation pressure Check the operation of
the pump OTHER CAUSES Check the cleanliness of the exchanger Check the
operation of the temperature sensors Check the temperature sensor connection
INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a
manual venting cycle
20
400 Combi 2
8 Troubleshooting
DISPLAY Group Specific code code
H.01 .18
H.01 .21
H.02 .00 H.02 .02 H.02 .03 H.02 .04 H.02 .05 H.02 .07 H.02 .09 H.02 .10 H.02
.70 H.03 .00
H.03 .02
H.03 .05
H.03 .54
DESCRIPTION OF TEMPORARY FAULTS
CAUSE Check/Solution An installer is required for most checks and solu tions.
No water circulation (temporary).
INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual venting cycle Check the operation of the pump Check the boiler/installation circulation TEMPERATURE SENSOR ERROR Check the operation of the temperature sensors Check the temperature sensor connection
Flow temperature increase during domestic hot water operation too fast.
INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual venting cycle Check the operation of the pump Check the boiler/installation circulation TEMPERATURE SENSOR ERROR Check the operation of the temperature sensors Check the connection of the temperature sensors
Reset in progress.
It resolves itself
Waiting for configuration settings to be entered (CN1,CN2).
CN1/CN2 CONFIGURATION MISSING Configure CN1/CN2
Configuration settings (CN1,CN2) not entered correc Check configuration CN1/CN2 Configure
tly.
CN1/CN2 correctly
PCB settings cannot be read.
MAIN PCB ERROR Configure CN1/CN2 Replace the main PCB
Setting memory not compatible with the boiler PCB ty pe.
Contact the Service Network
Check the installation pressure and restore Low pressure in heating circuit
(water filling required). Check the expansion vessel pressure
Check for boiler/installation leaks
Partial stoppage of the boiler (antifreeze function acti ve)
SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices Parameter configuration error: Check AP001
Total stoppage of the boiler (antifreeze function not active)
SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices Parameter configuration error: Check AP001
External unit heat recovery test failed
PCB accessory error SCB-09 Check the device connected to contact X9
No identification data for boiler safety device.
MAIN PCB ERROR Contact the Service Network
Temporary flame loss
ELECTRODE PROBLEM Check the electrode connection and wiring Check the condition of the electrode GAS SUPPLY Check the gas supply pressure Check the gas valve calibration FLUE GAS PIPES Check the pipes and the terminal
Power supply voltage too low
Check the mains voltage
Temporary flame loss Shutdown due to the power supply voltage being too low
ELECTRODE PROBLEM Check the electrode electrical connections Check the condition of the electrode GAS SUPPLY Check the gas inlet pressure Check the gas valve calibration FLUE GAS EXHAUST PIPE Check the air intake and flue gas exhaust termi nal Check the power supply voltage
400 Combi 2
21
8 Troubleshooting
Tab.12 List of permanent faults (boiler stoppage, reset required)
DISPLAY Group Specific DESCRIPTION OF PERMANENT FAULTS (RESET) code code
E.00 .04
Return temperature sensor disconnected
E.00 .05
Return temperature sensor short circuited
E.00 .16
DHW tank temperature sensor not connected
E.00 .17 E.00 .20 E.00 .21
DHW tank temperature sensor short-circuited
The flue gas temperature sensor is not connected or measured a temperature
below the range
The flue gas temperature sensor has short-circuited or measured a temperature
above the range
E.01 .04
Flame loss detected five times in 24 hours
E.01 .12
Temperature measured by return sensor greater than flow temperature
E.01 .17
No water circulation (permanent)
E.01 .20 E.02 .13
Maximum flue gas temperature reached
Total stoppage of the boiler (antifreeze function not active)
E.02 .17
Permanent communication failure in the PCB
CAUSE Check/Solution An installer is required for most checks and solu
tions.
SENSOR/CONNECTION PROBLEM Check the operation of the temperature sensor Check
the sensor/PCB connection
SENSOR/CONNECTION PROBLEM Check the operation of the sensor Check the
sensor/PCB connection
SENSOR OPEN Check the operation of the sensor Check the sensor/PCB connection
When removing a domestic hot water tank, set parameter DP150=1
SENSOR CLOSED Check the operation of the sensor Check the sensor/PCB
connection
SENSOR OPEN Check the operation of the sensor Check the sensor/PCB connection
SENSOR CLOSED Check the operation of the sensor Check the sensor/PCB
connection
GAS SUPPLY Check the gas supply pressure Check the gas valve calibration
ELECTRODE PROBLEM Check the electrode connection and wiring Check the
condition of the electrode FLUE GAS PIPES Check the air intake and flue gas
exhaust pipes EXCHANGER ON FLUE GAS SIDE BLOCKED Check the cleanliness of the
exchanger MAINS VOLTAGE Check the power supply voltage
SENSOR/CONNECTION PROBLEM Check that the sensors are positioned the correct
way around Check that the flow sensor is in the correct posi tion Check the
return temperature in the boiler Check the operation of the sensors
INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual
venting cycle Check the operation of the pump Check the boiler/installation
circulation SENSOR ERROR Check the operation of the temperature sensors Check
the temperature sensor connection
EXCHANGER ON FLUE GAS SIDE BLOCKED Check the cleanliness of the exchanger
SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices
Parameter configuration error: Check setting AP001
MAIN PCB ERROR Check for any electromagnetic interference Contact the Service
Network
22
400 Combi 2
8 Troubleshooting
DISPLAY Group Specific code code E.02 .35 E.02 .39 E.02 .47 E.04 .01 E.04 .02
E.04 .03
E.04 .08
E.04 .10
E.04 .12 E.04 .13 E.04 .17 E.04 .18 E.04 .23 E.04 .29 E.04 .254
DESCRIPTION OF PERMANENT FAULTS (RESET) Critical safety device disconnected
Minimum pressure not reached after 6 minutes of au tomatic filling Connection
to external device unsuccessful Flow temperature sensor short circuited Flow
temperature sensor disconnected Maximum flow temperature exceeded or flow
tempe rature sensor short circuited
Maximum safe temperature value reached
Burner failed to ignite after 4 attempts
Ignition failure for monitoring parasitic flame Fan blade blocked or maximum
rpm exceeded Fault in gas valve control circuit The flow temperature is below
the minimum tempera ture or the flow temperature sensor is not connected
Communication internal stoppage Communication internal stoppage Fault in gas
valve control circuit
CAUSE Check/Solution An installer is required for most checks and solu
tions.
COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the
devices connected to contact X9
AUTOMATIC FILLING ERROR Check automatic filling is working
ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD))
Check the electrical connections of external devi ces.
SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation
of the sensor
SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation
of the sensor
INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a
manual venting cycle Check the operation of the sensors
INSUFFICIENT CIRCULATION Check the pressure in the installation Switch on the
manual degassing function Check that the pump is working Check the circulation
in the boiler/installation OTHER POSSIBLE CAUSES Check the safety thermostat
connection Check that the safety thermostat is working cor rectly
GAS SUPPLY Check the gas supply pressure Check the gas valve electrical
connection Check the gas valve calibration Check the operation of the gas
valve ELECTRODE PROBLEM Check the electrode electrical connections Check the
electrode condition OTHER CAUSES Check the operation of the fan Check the
condition of the flue gas exhaust (bloc kages)
Check the ground circuit Check the power supply voltage Check the electrode
conditions
FAN/PCB PROBLEM Check the PCB-fan connection Check the fan operation
MAIN PCB ERROR Check the electrical connections for the gas valve
SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation
of the sensor
Switch the power supply off and on again and then RESET
Switch the power supply off and on again and then RESET
MAIN PCB ERROR Check the electrical connections
400 Combi 2
23
8 Troubleshooting
Tab.13 List of warnings
DISPLAY
Group Specific code code
DESCRIPTION OF WARNINGS BEFORE A FAULT IS DETECTED
A.00 .28
Solar temperature sensor is either removed or measures a temperature below range
A.00 .29
Solar temperature sensor is either shorted or measures a temperature above range
A.00 .34
Outdoor temperature sensor expected but not detec ted
A.02 .06
Low pressure in heating circuit
A.02 .36
Functional device disconnected
A.02 .37 A.02 .45 A.02 .46 A.02 .48
Passive functional device disconnected Connection error Device priority error Unit function configuration error
A.02 .49
A.02 .54 A.02 .55 A.02 .76
Failed node initialisation
Open Therm bus power supply error
Incorrect or missing serial number Internal memory reserved for full
customisation of set tings. No further changes can be made
CAUSE Check/Solution
Check the solar temperature sensor wiring. Re place the sensor if necessary.
In case of removal of the solar tank, set the parameter DP150=1.
Check the solar temperature sensor wiring. Re place the sensor if necessary.
OUTDOOR SENSOR NOT DETECTED Enter the correct value of the parameter AP091
Connect the outdoor sensor Outdoor sensor is not connected correctly
Check the installation pressure and restore Check the expansion vessel
pressure Check for boiler/installation leaks
COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the
devices connected to contact X9
COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the
devices connected to contact X9
COMMUNICATION FAULT Start the auto-detect function (parameter AD))
COMMUNICATION FAULT Start the auto-detect function (parameter AD))
ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD))
Check electrical connections of external devices
ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD))
Check electrical connections of external devices
Check the devices connected to contact X17 Terminal board M2 (7-8)
Contact the Service Network
Contact the Service Network
Important When connecting a Room Unit/Control Unit to the boiler, the code “254” is always shown in the event of a fault.. Read the fault code shown on the boiler display.
24
400 Combi 2
8 Troubleshooting
8.3 Fault finding
Tab.14 Problems and solutions
Problem
Possible causes
Solution
There is no domestic hot wa ter.
The boiler is not working.
Check that the boiler is being supplied with power. Check fuses and the switches. Check whether the gas isolation cock is properly open. If the property has a prepayment meter ensure it has sufficient credit.
The DHW function is switched off.
Activate the DHW mode.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
Insufficient flow.
Flow must be at least 2 litres per minute.
The temperature set point for the heating is too low.
Increase the value with the CH temperature knob or if a room thermostat is connected, increase the temperature on the room thermostat.
The heating mode is deactivated.
Activate the heating mode.
The radiators are cold.
The radiator valves are not open. The boiler is not working.
Open the valves of all radiators connected to the system.
Check that the boiler is being supplied with power. Check fuses and switches.
Check whether the gas isolation cock is properly open. If the property has a
prepayment meter ensure it has sufficient credit.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The temperature set point for the heating is too low.
Increase the value with the CH temperature knob or if a room thermostat is connected, increase the temperature on the room thermostat.
No demand for heating.
Ensure that timers & thermostats are calling for heat.
The boiler is not working.
No power supply.
Check that the boiler is being supplied with power. Check the fuses and switches.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The boiler is indicating an error.
Press the Reset button. Correct the error, if possible.
The gas pressure is too low.
Check whether the gas isolation cock is fully open. Open the gas isolation cock.
Condensate drain blocked.
Check drain, especially any external runs in freez ing temperatures.
If the boiler is not working also check section “Operation checking procedure and basic fault identification” or contact your Installer.
400 Combi 2
25
Decommissioning
Decommissioning procedure
Caution Only qualified persons are authorised to work on the appliance and
system to decommission.
If your boiler needs to be decommissioned either temporarily or permanently
the following should be performed:
1. Switch off the boiler’s electrical connection. 2. Close the gas isolation
tap. 3. Drain the central heating system.
Seek the advice of your installer.
26
400 Combi 2
Disposal
10.1 Disposal and recycling
Fig.12 Recycling
MW-3000179-03
10 Disposal
The appliance is composed of multiple components made from various different
materials, such as steel, copper, plastic, fibreglass, aluminium, rubber,
etc.. These materials may be highly pollutant. This means that the boiler must
be disposed of correctly by contacting staff at the nominated disposal
facility or by taking it to a centre that is authorised to dispose of bulky
waste (domestic appliances).
Warning Removal and disposal of the boiler must be carried out by a qualified
installer in accordance with local and national regulations.
400 Combi 2
27
Environmental
11 Environmental
11.1 Energy saving
11.2 Room thermostats and settings
Tips on saving energy:
Do not cover radiators. Do not hang curtains in front of radiators. Install
reflective panels behind the radiators to prevent heat loss. Insulate the
pipes in rooms that are not heated (cellars and lofts). Install loft
insulation & double glazing. Use draught excluders where necessary. Upgrade
any older boiler external controls. Turn down room thermostats by 1°. Turn off
radiators in rooms not in use. Do not run hot (or cold) water pointlessly. Fit
a water-saving shower head to save up to 40 % energy. Take showers rather than
baths. A bath consumes twice as much water and energy.
Various models of room thermostat are available. The thermostat type and
setting affect the total energy consumption.
A few tips:
A modulating thermostat in combination with thermostatic radiator valves saves
energy and offers considerable comfort. This combination gives you flexibility
with the temperatures. Do not fit thermostatic radiator valves in the room in
which the room thermostat is installed. Completely closing and opening
thermostatic valve radiators causes undesirable temperature fluctuations. Open
and close thermostatic valves in small steps. Lower the thermostat to around
20°C. This reduces heating costs and energy consumption. Lower the room
thermostat temperature temporarily if opening windows to air the rooms. If you
are using an ON/OFF type thermostat, reduce the water temperature value in
summer (e.g. 60°C in summer and 80°C in winter). When setting an hourly
programmable thermostat, consider days when you are absent or on holiday.
Electricity production and energy savings reach their optimum level with a
programmed and activated timer programme.
28
400 Combi 2
Warranty
12.1 General
To make sure your boiler warranty is activated and maintained, it is essential
that the:
1. Benchmark checklist is completed by your installer 2. Warranty is
registered within 30 days 3. Boiler has an annual service
Important Please note that failure to adhere to terms and conditions will
invalidate your warranty.
12.2 Standard warranty terms and conditions
Warranty registration, service & repair For full terms and conditions, visit
www.baxi.co.uk/terms.
Benchmark checklist The Benchmark Checklist will be completed by your
installer and records that the boiler has been installed and commissioned
correctly. It can be found at the back of the installation and service manual
and should be kept in a safe place for the life of the boiler. We will check
that the Benchmark Checklist has been completed on an in-warranty visit.
Ways to register your warranty If your boiler is eligible for an extended
warranty, your installer may register the product on your behalf and provide
you with the relevant documentation. Please check with your installer. Should
this not be the case, you can register your warranty online at
www.baxi.co.uk/registration
Annual service A service must be completed every 12 months from the date of
installation to maintain your warranty. This service must be completed by one
of the following:
A Gas Safe registered installer/engineer Baxi Customer Support; call us 0344
871 1545
Please make sure that your engineer has logged the service information at the
back of the installation and service manual. You will be asked for your
service history on any in-warranty repair visit.
If you experience a problem with your boiler For any in or out of warranty
repair, Baxi Customer Support is on hand to help you. Call our award-winning
team to arrange for one of our nationwide team of Gas Safe registered
engineers to visit. If your product is in warranty, everything is free of
charge, subject to our warranty terms and conditions. If it is out of
warranty, we can still help and offer a range of options you can choose from
to suit your needs.
Contact Baxi Customer Support 0344 871 1545
Opening hours Monday – Friday, 8.00am – 6.00pm Weekends and Bank Holidays,
8.30am – 2.00pm
Please note calls may be recorded for training and monitoring purposes.
When contacting Baxi Customer Support, please have the following information
to hand:
Boiler serial number.
400 Combi 2
29
12 Warranty
Proof of purchase if you do not have the boiler serial number
Please note that for in-warranty repairs, our engineers will ask to see your
service history record, completed Benchmark Checklist and details of your
installer. These can all be found in the Installation and Service manual.
30
400 Combi 2
13 Appendix
13 Appendix
13.1 Product fiche – Combination boilers
Tab.15 Product fiche for combination boilers
Space heating – Temperature application Water heating – Declared load profile
Seasonal space heating energy efficiency class Water heating energy efficiency
class Rated heat output (Prated or Psup) Space heating – Annual energy
consumption Water heating – Annual energy consumption
Seasonal space heating energy efficiency Water heating energy efficiency Sound
power level LWA indoors
(1) Electricity (2) Fuel
424 Medium
XL
430 Medium
XL
424 LPG Medium
XL
430 LPG Medium
XL
kW
20
GJ
62
kWh(1)
39
GJ(2)
17
%
93
%
88
dB
50
20
20
20
62
62
62
42
39
42
17
17
17
93
93
93
89
88
89
49
50
49
See For specific precautions about assembling, installing and maintaining: Safety, page 5
400 Combi 2
31
13 Appendix
13.2 Package fiche – boilers
Fig.13 Package fiche for boilers indicating the space heating energy
efficiency of the package Seasonal space heating energy efficiency of boiler
1 `I’ %
Temperature control from fiche of temperature control
Class I = 1%, Class II = 2%, Class III = 1.5%, Class IV = 2%, Class V = 3%, Class VI = 4%, Class VII = 3.5%, Class VIII = 5%
2
%
Supplementary boiler from fiche of boiler
Seasonal space heating energy efficiency (in %)
3
(
– `I’ ) x 0.1 = ±
%
Solar contribution
(1)
Tank rating
from fiche of solar device
A* = 0.95, A = 0.91,
Collector size (in m²)
Tank volume (in m³)
Collector efficiency (in
B = 0.86, C = 0.83,
%)
D – G = 0.81
4
(`III’ x
`IV’ x
) x 0.9 x (
/100)
x
= +
%
(1) If tank rating is above A, use 0.95
Supplementary heat pump from fiche of heat pump
Seasonal space heating energy efficiency (in %)
5
(
– I’ ) xII’ = +
%
Solar contribution AND Supplementary heat pump
select smaller value
4
0.5 x
OR
5
6
0.5 x
= –
%
Seasonal space heating energy efficiency of package
7 %
Seasonal space heating energy efficiency class of package
G
F
E
D
C
B
A
A+
A++
A+++
<30%
Boiler and supplementary heat pump installed with low temperature heat emitters at 35°C ?
from fiche of heat pump
7
+ (50 x `II’) =
%
The energy efficiency of the package of products provided for in this fiche
may not correspond to its actual energy efficiency once installed in a
building, as this efficiency is influenced by further factors such as heat
loss in the distribution system and the dimensioning of the products in
relation to building size and characteristics.
AD-3000743-01
32
400 Combi 2
13 Appendix
I
The value of the seasonal space heating energy efficiency of the
preferential space heater, expressed in %.
II
The factor for weighting the heat output of preferential and
supplementary heaters of a package as set out in the following
table.
III The value of the mathematical expression: 294/(11 Prated),
whereby `Prated’ is related to the preferential space heater.
IV The value of the mathematical expression 115/(11 Prated),
whereby `Prated’ is related to the preferential space heater.
Tab.16 Weighting of boilers
Psup / (Prated + Psup)(1)(2)
II, package without hot water storage tank II, package with hot water storage tank
0
0
0
0.1
0.3
0.37
0.2
0.55
0.70
0.3
0.75
0.85
0.4
0.85
0.94
0.5
0.95
0.98
0.6
0.98
1.00
0.7
1.00
1.00
(1) The intermediate values are calculated by linear interpolation between the two adjacent values. (2) Prated is related to the preferential space heater or combination heater.
Tab.17 Package efficiency Baxi Combi Temperature control X Temperature control Y
424 % %
430 424 LPG 430 LPG
400 Combi 2
33
12 Appendix
13.3 Package fiche – Combination heaters (boilers or heat pumps)
Fig.14 Package fiche for combination heaters (boilers or heat pumps) indicating the water heating energy efficiency of the package
Water heating energy efficiency of combination heater
1
`I’ %
Declared load profile:
Solar contribution from fiche of solar device
Auxiliary electricity
2
(1.1 x I’ – 10%) xII’ – III’ –I’ = +
%
Water heating energy efficiency of package under average climate
3 %
Water heating energy efficiency class of package under average climate
G
F
E
D
C
B
A
A+
A++
A+++
M
L
XL
XXL <28%
Water heating energy efficiency under colder and warmer climate conditions
Colder: Warmer:
3
2
– 0.2 x
=
%
3
2
+ 0.4 x
=
%
The energy efficiency of the package of products provided for in this fiche may not correspond to its actual energy efficiency once installed in a building, as this efficiency is influenced by further factors such as heat loss in the distribution system and the dimensioning of the products in relation to building size and characteristics.
AD-3000747-01
I
The value of the water heating energy efficiency of the combination
heater, expressed in %.
II
The value of the mathematical expression (220 Qref)/Qnonsol,
where Qref is taken from Regulation EU 811/2013, Annex VII Table
15 and Qnonsol from the product fiche of the solar device for the
declared load profile M, L, XL or XXL of the combination heater.
III
The value of the mathematical expression (Qaux 2,5)/(220 Qref),
expressed in %, where Qaux is taken from the product fiche of the
solar device and Qref from Regulation EU 811/2013, Annex VII
Table 15 for the declared load profile M, L, XL or XXL.
34
400 Combi 2
© Copyright
All technical and technological information contained in these technical
instructions, as well as any drawings and technical descriptions supplied,
remain our property and shall not be multiplied without our prior consent in
writing. Subject to alterations.
Baxi Customer Support 0344 871 1545
Opening hours Monday – Friday, 8.00am-6.00pm Weekends and Bank Holidays,
8.30am-2.00pm
Please note calls may be recorded for training and monitoring purposes
baxi.co.uk
Register now to activate your warranty:
www.baxi.co.uk/registration
For the warranty to be maintained, please make sure… 1 Benchmark checklist is
completed 2 Warranty is registered within 30 days 3 The boiler has an annual
service
For full terms and conditions, visit www.baxi.co.uk/terms. Failure to adhere
to terms and conditions will void your manufacturer’s warranty.
Baxi Brooks House, Coventry Road, Warwick, CV34 4LL
Please ensure the boiler is installed in accordance with these installation
instructions and that you adhere to the Building Regulations.
e&oe All descriptions and illustrations provided in this document have been
carefully prepared but we reserve the right to make changes and improvements
in our products which may affect the accuracy of the information contained in
this leaflet. All goods are sold subject to our standard Conditions of Sale
which are available on request.
7791869 – 06 – 03052022
0086
References
- Baxi Boilers | Baxi
- Baxi Boilers | Baxi
- Consumer Portal
- Terms and Conditions | Baxi
- Installers First
- Gas Safe Register - The Official List of Gas Safe Registered Businesses - Gas Safe Register
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