Biasi Basica Cond 25S User manual

User manual and
installation
instructions
Basica Cond

- 2 -
WARNING
Congratulations on choosing this product.
Your modulating boiler is electronically adjusted and ignited.
• It is highly efcient.
• It has a sealed chamber.
Unlike traditional boilers, your condensing boiler makes it possible to recover energy by
condensing the water vapour contained in the ue gas. This means that, with equal heat
production, it consumes less gas, and the ue gas contains fewer substances that are
harmful to the environment.
The materials used and the control systems offer safety, high levels of comfort and energy
savings so you can appreciate the maximum advantages of autonomous heating.
IMPORTANT
The manual must be read carefully to ensure rational and safe use of the boiler. It must
be stored with care as it may be necessary to consult it in the future. If the unit is trans-
ferred to another owner, the manual must accompany the boiler.
 Therstignition must be carried out by one of the authorised service centres, which
validates the warranty from the date on which it is performed.
The manufacturer declines all liability for translations of this manual from which incorrect
interpretations may result. It cannot be considered responsible for failure to observe the
instructions contained in this manual or the consequences of any actions that have not
been specically described.
DURING INSTALLATION
After removing the packaging, make sure that the appliance isnotdamaged.
If damaged donotinstallorstartup the appliance as it may be dangerous.
Contact your retailer or the nearest authorised service centre.
 Installation must be carried out by qualied personnel who are responsible for compli-
ance with all applicable national and local laws and standards:
• the suitability of the installation site;
• the robustness of the wall intended for installation;
• the distance of the appliance from walls and surrounding objects;
• correct hook-up to the gas system;
• correct and safe set-up of the of air supply and combustion products evacuation sys-
tem;
• correct hook-up to the electrical power supply and earth circuit;
• compliance with the technical specications.
 Theboiler is used to heat water to a temperature that is lower than boiling point, and
must be connected to a heating system and/or a domestic hot water distribution network
that is compatible with its performance and power.
The boiler must be supplied with Methanegas(G20)orLPG(PropaneG31).
The condensate discharge must be connected to the residential condensate outlet duct
and it must be possible to inspect it (UNI 11071 and related standards).

- 3 -
WARNING
The boiler must only be used for the purpose for which it was designed. Furthermore:
• It must not be exposed to atmospheric agents.
• The appliance can be used by children no younger than 8 years old, by people with
physical, sensory or cognitive disabilities, and by people lacking experience or the nec-
essary knowledge, provided that they are supervised or have been instructed on how
to use the appliance safely and that they understand the risks associated with it. Do not
let children play with the appliance. Do not allow unsupervised children to perform user
maintenance and cleaning.
• Prevent incorrect use of the boiler.
• Avoid making adjustments to the sealed devices.
• Avoid contact with hot parts during operation.
DURING USE
 Itisprohibitedanddangerous to obstruct, even partially, the air intakes for the ventila-
tion of the room where the boiler is installed (UNI 11071 and related standards);
 Repairs must only be carried out by authorised service centres using original spare parts.
Therefore, in the case of a problem, deactivate the boiler only (see instructions).
If you smell gas:
• Do not turn on electric switches, the telephone or any other object that could create
sparks.
• Immediately open up the doors and windows to create an air current that cleans the
room.
• Close the gas cocks.
• Request the intervention of professionally qualied personnel.
 Beforestartingtheboiler, have a qualied professional check that the gas supply sys-
tem:
• is perfectly sealed;
• is the right size for the required ow rate to the boiler;
• is equipped with the safety and control devices required by current standards.
• Make sure that the installer has connected the safety valve drain to a outlet funnel.
The manufacturer is not responsible for damage caused by the water released when
the safety valve opens, if it is not correctly connected to a drainage system.
• Make sure that the installer has connected the condensate siphon drain to a specic
outlet funnel (UNI 11071 and related standards), which must be implemented in order
to avoid the condensate freezing and ensure it is correctly drained.
 Neartheboiler:
• there must be an all-pole disconnection switch to isolate the appliance from the electric
power supply.
• a gas shut-off valve to interrupt the ow of fuel.
 Donottouchtheunit with wet or damp body parts and/or in bare feet.
 Ifperformingstructuralworkormaintenance near the ue gas ducts and/or the ue
gas exhaust devices or their accessories, turn off the unit and, when the work is complete,
have a qualied technician check the efciency.

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WARNING
Appliancecategory:II2H3P(gasG2020mbar,G3137mbar)
Destinationcountry:GB
This unit is compliant with the following European Directives:
Regulation (EU) 2016/426 on appliances burning gaseous fuels
Boiler Efciency Directive 92/42/EEC
Electromagnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
Ecodesign Directive 2009/125/EC
In order to constantly improve its products, the manufacturer reserves the right to change the data pro-
vided in this documentation at any time and without notice.
This documentation is provided for information purposes and cannot be considered as a contract with
third parties.
DANGER:Instructionsmarkedwiththissymbolmustbeobservedtoprevent
mechanicalorgenericaccidents(e.g.injuriesorbruises).
DANGER:Instructionsmarkedwiththissymbolmustbeobservedtoavoid
electricalaccidents(electrocution).
DANGER:Instructionsmarkedwiththissymbolmustbeobservedtoavoid
theriskofreorexplosions.
DANGER:Instructionsmarkedwiththissymbolmustbeobservedtoavoid
heat-relatedaccidents(burns).
WARNING:Instructionsmarkedwiththissymbolmustbeobservedtoavoid
malfunctionsand/ormaterialdamagetotheunitorotheritems.
WARNING:Instructionsmarkedwiththissymbolcontainimportantinforma-
tionthatmustbereadcarefully.
WARNING:Riskofcutting/stabbing.Protectiveglovesmustbeworn.

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TABLE OF CONTENTS
1 BOILERDESCRIPTION............... 6
1.1 Assembly view........................6
1.2 Shut-off valves and cocks ...............6
1.3 Control panel .........................7
1.4 General LCD characteristics .............7
2 USAGEINSTRUCTIONS.............. 10
2.1 Warnings ...........................10
2.2 Ignition .............................10
2.3 Heating circuit temperature .............11
2.4 Domestic hot water temperature .........12
2.5 Shutdown...........................13
3 USEFULTIPS...................... 14
3.1 Filling the heating circuit ...............14
3.2 Heating ............................14
3.3 Antifreeze protection ..................14
3.4 Periodic maintenance .................15
3.5 External cleaning .....................15
3.6 Operating anomalies ..................15
3.7 Displays in INFO mode ................16
3.8 Flue thermal fuse.....................17
4 TECHNICALSPECIFICATIONS........ 18
4.1 Assembly view.......................18
4.2 Schematic diagram ...................19
4.3 Wiring diagram ......................21
4.4 Technical data M270V.2025 SM .........22
4.5 Technical data M270V.2530 SM .........26
4.6 Hydraulic characteristics ...............30
4.7 Expansion vessel.....................30
5 INSTALLATION..................... 31
5.1 Warnings ...........................31
5.2 Installation precautions ................32
5.3 Installing the boiler bracket .............32
5.4 Dimensions .........................33
5.5 Fittings .............................34
5.6 Boiler assembly ......................34
5.7 Installing the ue gas exhaust duct .......34
5.8 Flue gas outlet dimensions and lengths ...35
5.9 C63 exhaust-ue pipework..............39
5.10 Positioning the draught terminals ........40
5.11 Electrical connections .................41
5.12 Connecting a room thermostat or zone
valves .............................42
5.13 Electrical connection of the remote control
(optional) ...........................43
5.14 Enabling of operation with remote control
(optional) ...........................43
5.15 Installing the external temperature sensor . 44
5.16 Electrical connection between the boiler
and the external sensor ................44
5.17 Enabling operation with the external
sensor and setting the K coefcient.......44
5.18 Selecting the maximum heating
temperature setpoint with climatic curve set 47
5.19 Selecting the heating temperature set.....47
5.20 Setting pump post-circulation ...........48
5.21 Selecting re-ignition frequency ..........49
5.22 Examples of hydraulic systems with
hydraulic separator (optional) ...........50
6 PREPARATIONFORSERVICE........ 52
6.1 Warnings ...........................52
6.2 Sequence of operations................52
7 CHECKINGTHEGASSETTING........ 55
7.1 Warnings ...........................55
7.2 Gas operations and setting .............55
8 GASCONVERSION................. 59
8.1 Warnings ...........................59
8.2 Gas operations and setting .............59
9 MAINTENANCE..................... 61
9.1 Warnings ...........................61
9.2 Removing the body panels .............61
9.3 Emptying the DHW circuit ..............62
9.4 Emptying the heating circuit ............62
9.5 Cleaning the primary condensate
exchanger and the burner ..............63
9.6 Check the pressure in the heating
expansion tank ......................64
9.7 Cleaning the domestic hot water exchanger 64
9.8 Checking the ue gas expulsion duct .....64
9.9 Checking boiler efciency ..............64
9.10 Checking the condensate discharge siphon 65
9.11 Setting the boiler's chimney sweep function 66
9.12 Settings for changing the control board....67
10BOILERDISPOSALANDRECYCLING. . 70
Models Boiler certication code
Basica Cond 25S M270V.2025 SM
Basica Cond 30S M270V.2530 SM

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USE
BOILER DESCRIPTION
1 BOILERDESCRIPTION
1.1 Assemblyview
The boiler model and serial number are
printed on the warranty certicate.
Figure1.1
1
1 Control panel
1.2 Shut-offvalvesandcocks
Install a shut-off cock for the
DHWinlet.
Theguresin this manualonly
show one of the possible ways
ofinstallingcocks,pipesandt-
tings.
Figure1.2
2
3
4
5 6
7
8 9
12
11
10
2 Gas supply label
3 Condensate outlet pipe
4 Heating circuit lling cock
5 Heating delivery pipe
6 Domestic hot water outlet pipe
7 Gas cock
8 Domestic hot water inlet pipe
9 Heating return pipe
10 Heating circuit safety valve discharge
pipe
11 Heating circuit drain cock
12 Heating circuit pressure gauge

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USE
BOILER DESCRIPTION
1.3 Controlpanel
Figure1.3
13
14
15
16
17
1819
13 Domestic hot water temperature in-
crease button
14 Domestic hot water temperature de-
crease button
15 LCD display
16 Heating temperature decrease button
17 Heating temperature increase button
18 Stand-by/Winter/Summer button
19 Reset button
1.4 GeneralLCDcharacteristics
For the boiler technical specications, con-
sult the section "TECHNICAL SPECIFICA-
TIONS" on page 18.
Figure1.4
bar
RESET
KEY
The symbol indicates a volatile
error. The boiler is reactivated
automatically once the fault
has been resolved
The symbol indicates that the
boiler can be restarted directly
by the user by pressing the re-
set button
All symbols with lines radiat-
ing from them indicate that the
symbol is ashing
LCDSIGNALS
LCD FUNCTION
E01 + Safety lockout due to
failed ignition
E02 + Lockout due to safety
thermostat
E03 + EEPROM error

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USE
BOILER DESCRIPTION
LCD FUNCTION
Boiler in summer (DHW
only) and stand-by
Boiler with DHW power
request.
The DHW temperature
is displayed.
Boiler with heating
power request.
The temperature of the
primary heating circuit
is displayed.
Burner ignition
(discharge)
Flame detected
(burner ignited)
Boiler in DHW an-
ti-freeze phase (the
symbol ashes)
Boiler in heating an-
ti-freeze phase (the
symbol ashes)
Heating set tempera-
ture
(all other symbols are
disabled)
DHW set temperature
(all other symbols are
disabled)
LCD FUNCTION
E04 +
Pump circulation failure
or insufcient system
pressure
E05 + Fan control anomaly
E06 +
Heating NTC probe fail-
ure
E07 +
DHW NTC probe fail-
ure
E08 +
External NTC probe
failure
E09 +
Flue gas NTC probe
failure (interruption)
E10 +
Lockout due to tripping
of the ue gas probe
E11 + Parasite ame
E12 +
Return NTC probe fail-
ure
E14 +
Temperature gradi-
ent circulation failure
(>2K/s)
E22 +
Heating delivery tem-
perature between 90°C
and 100°C
E25 + Boiler in antifreeze
E26 + Gas valve fault
E28 + Tank NTC probe failure
E50 +
Communication with
remote control lost
E52 + Maximum number of
remote unlock attempts
Boiler off, (antifreeze
protection active)
Boiler in winter (heat-
ing/DHW) and stand-by

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USE
BOILER DESCRIPTION
LCD FUNCTION
Boiler in chimney
sweep function.
To activate the chim-
ney sweep function, set
“parameter P06≠0”.
1 = minimum power
2 = maximum power
During the the chimney
sweep function, the
and/or symbols
do not ash.

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USE
USER INSTRUCTIONS
2 USAGEINSTRUCTIONS
2.1 Warnings
Checkthattheheatingcircuitis
correctly lled with water, even
iftheboilerisonlyusedforpro-
ducingdomestichotwater.
Ifitisnot,proceedwithlling;seesec-
tion"Fillingtheheatingcircuit"onpage
14.
All boilers have an antifreeze system that is
activated if the temperature falls below 5°C;
therefore donotturnofftheboiler.
If the boiler is not used during cold periods,
with the resulting risk of freezing, proceed
as described in section "Antifreeze protec-
tion" on page 14.
2.2 Ignition
• The boiler cocks and the cocks used
during installation must be open (Figure
2.1).
Figure2.1
Open
position
• Power the boiler by turning on the two-
way switch tted during installation. The
LCD display shows the OFF status (only
the heating and DHW antifreeze functions
are active) Figure 2.2.
Figure2.2
bar
RESET
Heating/DHWoperation
• Press the 18 button and hold until both
symbols and appear on the dis-
play.
Figure2.3
13
14
15
16
17
1819
The LCD display shows the stand-by status
and the and symbols (Figure 2.4).
Figure2.4
bar
RESET
Operation with production of hot water
only
• Press the 18 button until the symbol
appears on the display Figure 2.5.

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USE
USER INSTRUCTIONS
Figure2.5
13
14
15
16
17
1819
The LCD display shows the stand-by status
and the symbol (Figure 2.6).
Figure2.6
bar
RESET
2.3 Heatingcircuittemperature
The heating delivery hot water temperature
can be adjusted using the 16 (decrease)
and 17 (increase) buttons (Figure 2.5) from
a minimum of approx. 28°C to a maximum
of approx. 55°C or from a minimum of ap-
prox. 50°C to a maximum of approx. 80°C
(see "Selecting the heating temperature
set" on page 47). The rst time one of
these two buttons is pressed the “set” value
is displayed; the second time it is pressed
this can be changed.
Signal on the LCD display:
•the “set” value of the heating delivery hot
water temperature and the symbol
ash. The display background lights up
(Figure 2.7).
Figure2.7
bar
RESET
Adjustingtheheatingtemperaturebased
ontheoutdoortemperature(withoutex-
ternal sensor)
Adjust the heating delivery hot water tem-
perature as follows:
• from 27 to 35 with an outdoor temperature
of between 5°C and 15°C
• from 35 to 60 with an outdoor temperature
of between -5°C and +5°C
• from 60 to 80 with an outdoor temperature
of below -5°C.
Your qualied installer may suggest more
suitable settings for your system.
The set temperature has been reached
when the symbol is not visible on the
LCD display.
Heatingpowerdemand
When the boiler receives a heating power
request, the display shows the symbol
followed by an increase in the heating de-
livery water temperature. The symbol
ashes (Figure 2.8).
Figure2.8
bar
RESET

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USE
USER INSTRUCTIONS
Adjusting the heating temperature with
anexternalsensorinstalled
When the optional external sensor is in-
stalled, your boiler will automatically adjust
the heating system's delivery water tem-
perature according to the outdoor tempera-
ture.
In this case, the boiler must be set by a
qualied installer (see "Enabling operation
with the external sensor and setting the K
coefcient" on page 44).
If the room temperature is not comfortable,
you can increase or decrease the heating
system delivery temperature by ± 15°C us-
ing the 16 (decrease) and 17 (increase) but-
tons (Figure 2.5).
2.4 Domestichotwatertempera-
ture
The domestic hot water temperature can
be adjusted using the 13 (increase) and
14 (decrease) buttons (Figure 2.5) from a
minimum of approx. 35°C to a maximum of
approx. 60°C. The rst time one of these
two buttons is pressed, the “set” value is
displayed. The second time it is pressed,
the value can be changed.
Signal on the LCD display:
• the “set” value of the domestic hot water
and the symbol ash. The display
background lights up (Figure 2.9).
Figure2.9
bar
RESET
Adjustments
Adjust the temperature of the domestic hot
water to a value that suits your needs.
Limit the need to mix hot water with cold
water.
In this way, you can take full advantage of
the automatic setting.
If the water is particularly hard, we recom-
mend setting the boiler temperature to be-
low 50°C.
In such cases, we recommend installing a
water softener in the DHW system.
If the maximum ow rate of the domestic hot
water is too high for a sufcient temperature
to be reached, contact an authorised sup-
port technician to install a ow rate limiter.
Domestichotwaterdemand
When the boiler receives a request for do-
mestic hot water, the display shows the
symbol followed by an increase in the tem-
perature of the domestic hot water. The
symbol ashes (Figure 2.10).
Figure2.10
bar
RESET

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USE
USER INSTRUCTIONS
2.5 Shutdown
Press the 18 button (Figure 2.11) until the
message OFF appears on the LCD display
(Figure 2.12).
Figure2.11
13
14 16
17
1819
Figure2.12
bar
RESET
In OFF mode, the antifreeze protection is
active.
If the boiler will be inactive for a long period
of time:
• disconnect the boiler from the electric
power supply;
• close the boiler cocks Figure 2.13;
Figure2.13
Closed
position
• if necessary, empty the hydraulic circuits
(see section "Emptying the DHW circuit"
on page 62 and section "Emptying the
heating circuit" on page 62).

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USE
USEFUL TIPS
3 USEFULTIPS
3.1 Fillingtheheatingcircuit
Figure3.1
OPEN
CLOSED
Heatingcircuit
llingcock
Open the lling cock in Figure 3.1 located
under the boiler and check the heating cir-
cuit pressure on the pressure gauge at the
same time. The correct cold system pres-
sure value should be within the rst green
bar on the pressure gauge quadrant (Figure
3.2).
Figure3.2
When the operation is complete, close the
lling cock and bleed any air from the ra-
diators.
3.2 Heating
For rational and economical service, have a
room thermostat installed.
Never turn off the radiator in the room where
the room thermostat is installed.
If a radiator (or convector) does not heat up,
check if there is any air in the system and
make sure that the cock is open.
If the room temperature is too high, do not
adjust the radiator cocks but decrease the
heating temperature setting using the room
thermostat or the heating control buttons 16
and 17 (Figure 3.3).
Figure3.3
13
14
15
16
17
1819
3.3 Antifreezeprotection
The antifreeze system, and any addition-
al protective devices, safeguard the boiler
against possible damage due to freezing.
This system does not guarantee protection
for the entire hydraulic system.
Where the outdoor temperature could fall
below 0°C, it is recommended to leave the
entire system on, setting the room thermo-
stat to a low temperature.
The antifreeze function is active even if the
boiler is in OFF (Figure 3.4).

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USE
USEFUL TIPS
Figure3.4
bar
RESET
If the boiler is turned off, have a qualied
technician empty the boiler (heating and
DHW circuit) and empty the heating system
and the DHW system.
3.4 Periodicmaintenance
For efcient and regular boiler operation, it
is recommended that the boiler be serviced
and cleaned at least once a year by a tech-
nician from an authorised service centre.
During this check, the most important boil-
er components are inspected and cleaned.
This check may be performed within the
scope of a maintenance contract.
3.5 Externalcleaning
Beforeperforminganycleaning
operation,disconnecttheboiler
fromtheelectricmainssupply.
To clean, use a cloth soaked in soap and
water.
Do not use: Solvents, ammable substanc-
es or abrasive substances.
3.6 Operatinganomalies
If the boiler is not working and an error code
ashes on the display and the symbol
is shown, it is a volatile lockout. The boiler
is reactivated automatically once the fault
has been resolved (see "General LCD char-
acteristics" on page 7); the boiler is in
lockout mode (Figure 3.5).
Figure3.5
bar
RESET
Each fault is classied accord-
ing to the level of priority. If
morethanonefaultsaredetect-
ed at the same time, the most
urgenterrorcodeisshown.
Frequentsafetylockoutsshould
be reported to an authorised
servicecentre.
Otherpossibleanomaliesshownonthe
LCDdisplay
If an error code, the symbol and the
symbol are shown on the LCD dis-
play, the lockout is NOT volatile (Figure 3.6).
Figure3.6
bar
RESET
To restore operation, press the reset button
19 (Figure 3.3) on the boiler control panel.
Airbubblenoises
Check the pressure of the heating circuit
and ll it if necessary, see section "Filling
the heating circuit" on page 14.
Lowsystempressure
Add more water to the heating system.
To do this, refer to section "Filling the heat-
ing circuit" on page 14.

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USE
USEFUL TIPS
The user is responsible for periodically
checking the pressure of the heating sys-
tem.
If water needs to be added too often, have
the technical support centre check if there
are any leaks in the heating system or the
boiler itself.
Waterleaksfromthesafetyvalve
Check if the lling cock is closed tightly (see
"Filling the heating circuit" on page 14).
Check on the pressure gauge that the heat-
ing circuit pressure is not close to 3 bar.
Should this be the case, drain a part of the
water from the system through the air relief
valves in the radiators in order to reduce the
pressure to a normal value.
Inthecaseofmalfunctionsoth-
er than those described above,
shut down the boiler as de-
scribed in section "Shutdown"
on page 13 and call a techni-
cianfromtheauthorisedservice
centre.
3.7 DisplaysinINFOmode
INFO mode is used to view boiler status in-
formation. In the case of a boiler malfunc-
tion, provide this information to the service
centre so that they can work out its causes.
To access INFO mode, press 19 (Figure
3.7) and hold for 5 seconds until the code
n02 shows on the display (Figure 3.8).
Figure3.7
13
14
15
16
17
1819
Figure3.8
bar
RESET
To scroll through the values, press 13 (in-
crease) and 14 (decrease). Press 18 and
hold for 5 seconds to exit INFO mode (Fig-
ure 3.7).
The table summarises the possible values
visible in INFO mode.
Table of
contents
Valueshown
n02 DHW output temp.
n03 NTC return temperature (not
present)
n04 Flue gas temperature (not
present)
n05 Outdoor temperature
n08 Maximum set fan speed
(RPM/100)
n09 (not used)
n11 Flow rate

- 17 -
USE
USEFUL TIPS
n14 PWM pump speed
percentage
n15 Fan speed (RPM/100)
n20 (not used)
n21 Last error code
n22 Second-to-last error code
n26 Calculated heating set
point (with climatic curve or
congured set)
3.8 Fluethermalfuse
Trippingoftheuegasthermal
fuse involves a safety lockout,
andrequiresresettingbyanAu-
thorisedServiceCentre.
The ue thermal fuse 20, indicated in Figure
3.9, is a safety device that protects the ue
gas outlet duct, sending the boiler into safe-
ty lockout mode and switching it off.
To restore the normal operation of the boil-
er, contact the Authorised Service Centre.
Figure3.9
20

- 18 -
INSTALLATION
TECHNICAL SPECIFICATIONS
4 TECHNICALSPECIFICATIONS
4.1 Assemblyview
Figure4.1
20
22
40
23
21
37
31
4
33
34
36
36
35
28 41
30 12
25
10
24
26
32
27
11
38
39
45 46 42

- 19 -
INSTALLATION
TECHNICAL SPECIFICATIONS
Figure4.2
3 Condensate outlet pipe
4 Heating circuit lling cock
5Heating delivery pipe
6 Domestic hot water outlet pipe
7 Gas cock
8 Domestic hot water inlet pipe
9 Heating return pipe
10 Heating circuit safety valve discharge
pipe
11 Heating circuit drain cock
12 Heating circuit pressure gauge
20 Flue thermal fuse
21 Heating NTC - Max temperature NTC
22 Primary condensing exchanger
4.2 Schematicdiagram
45
46
47
22
23
40
37
28
42
26
32
35
24
7 9
11
3 5 8 6
33
29
25
30
41
36
44 43
34
48
20 21
4
49

- 20 -
INSTALLATION
TECHNICAL SPECIFICATIONS
23 Flame detection electrode/ignition
electrode
24 3 bar safety valve
25 Automatic bleed valve
26 Pump
27 Pump bleed cap
28 Gas valve
29 Gas valve inlet tapping point
30 DHW NTC probe
31 Control panel containing:
Terminal board for external temperature
probe, low-voltage ambient thermostat
cable or remote control (optional), elec-
tric power supply cable
32 Heating pressure switch
33 Condensate discharge siphon
34 DHW exchanger
35 Three-way valve
36 Three-way valve plug
37 Fan
38 Air/gas mixer
39 Air suction pipe
40 Burner
41 DHW owmeter
42 Expansion tank
43 Domestic hot water lter
44 DHW ow rate limiter (optional)
45 Flue gas exhaust duct
46 Air suction duct
47 Flue gas suction inlet
48 Air suction inlet
49 Integrated by-pass
* To access the Data plate, remove the front
panel from the body as described in the
Maintenance section.