Biasi 24S User manual

User manual and
installation
instructions
RINNOVA 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.
GENERAL WARNINGS
This manual contains important information aimed at:
• Users (section 1);
• Installers (section 2);
• Maintenance technicians (section 3).
Users must read the instructions in the relevant section carefully (section 1).
Users must only perform work on the appliance where explicitly stated in the relevant
section.
Improper installation or assembly of the appliance and/or components, accessories, kits
and devices supplied with the product may cause unforeseeable problems for people,
animals or property. Please read the instructions provided with the product for information
on how to install the product correctly.
This instruction manual contains technical product installation information. As regards
other topics related to product installation (e.g. occupational safety, accident prevention
and protecting the environment), you must observe the legislation in force and codes of
practice.
Maintenance must be performed by qualied technicians e.g. at an authorised service
centre, so as to guarantee a professional service.
Any errors occurring during installation, or while using or servicing the appliance, caused
by a failure to observe the technical legislation and regulations in force or the instructions
in this manual (or otherwise provided by the manufacturer) will exclude the manufacturer
from all contractual and non-contractual liability for any damage caused and will void the
appliance warranty.

- 3 -
WARNING
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 initial switch-on must be carried out by an Authorised Service Centre; the validity of
the warranty starts from the date the product is purchased.
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 professionals who are responsible for com-
pliance 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 7129-5 and related standards).
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 received instructions on
the safe use of the appliance and understand the inherent risks. 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.

- 4 -
WARNING
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 7129-2 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 7129-5 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.

- 5 -
WARNING
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.
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: Article 7(2) and Annex III of 92/42/EEC
• Electromagnetic Compatibility Directive 2014/30/EU
• Low Voltage Directive 2014/35/EU
• Directive 2009/125/EC Ecodesign requirements of energy-related products
• Regulation (EU) 2017/1369 Energy labelling
• Delegated regulation (EU) no. 811/2013
• Delegated regulation (EU) no. 813/2013
• Delegated regulation (EU) no. 814/2013 (where applicable)
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.

TABLE OF CONTENTS
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TABLE OF CONTENTS
1 BOILER DESCRIPTION ............... 7
1.1 Assembly view........................ 7
1.2 Shut-off valves and cocks ............... 7
1.3 Control panel ......................... 8
1.4 General LCD characteristics ............. 8
2 USER 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........................... 12
3 USEFUL TIPS ...................... 14
3.1 Filling the heating circuit ............... 14
3.2 Heating ............................ 14
3.3 Antifreeze protection .................. 15
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 M275V.2024 SM ......... 22
4.5 Technical data M275V.2428 SM ......... 25
4.6 Technical data M275V.2832 SM ......... 28
4.7 Hydraulic characteristics ............... 31
4.8 Expansion vessel..................... 31
5 INSTALLATION ..................... 32
5.1 Warnings ........................... 32
5.2 Precautions for installation ............. 33
5.3 Installing the boiler bracket ............. 33
5.4 Dimensions ......................... 34
5.5 Fittings ............................. 34
5.6 Boiler assembly ...................... 34
5.7 ....... 35
5.8 Flue gas outlet dimensions and lengths ... 36
5.9 C63 .............. 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 Accessing installer parameters .......... 43
5.15 Enabling of operation with remote control
(optional) ........................... 43
5.16 Installing the external temperature sensor . 44
5.17 Electrical connection between the boiler
and the external sensor ................ 44
5.18 Enabling operation with the external
....... 44
5.19 Selecting the maximum heating
temperature setpoint with the climatic
curve set ........................... 47
5.20 Selecting the heating temperature set..... 47
5.21 Setting pump post-circulation ........... 48
5.22 Selecting re-ignition frequency .......... 49
5.23 Factory reset ........................ 50
5.24 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 ..... 64
9.9 .............. 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
10BOILER DISPOSAL AND RECYCLING . . 71
Models
RINNOVA COND 24S M275V.2024 SM
RINNOVA COND 28S M275V.2428 SM
RINNOVA COND 32S M275V.2832 SM

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USER
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
4
3
5
6
7 8
9
11
10
2 Gas supply label
3 Heating circuit lling cock
4 Condensate outlet pipe
5 Heating delivery pipe
6 Domestic hot water outlet pipe
7 Gas cock
8 Heating circuit safety valve discharge
pipe
9 Heating return pipe
10 Domestic hot water inlet cock
11 Heating circuit drain cock

- 8 -
USER
BOILER DESCRIPTION
1.3 Control panel
Figure 1.3
12
13
14
15
16
1718
12 Domestic hot water temperature in-
crease button
13 Domestic hot water temperature de-
crease button
14 LCD display
15 Heating temperature decrease button
16 Heating temperature increase button
17 Stand-by/Winter/Summer button
18 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
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

- 9 -
USER
BOILER DESCRIPTION
LCD FUNCTION
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
(all other symbols are
disabled)
DHW set temperature
(all other symbols are
disabled)
Boiler in chimney
sweep function.
To activate the chim-
ney sweep function, set
“parameter P06≠0”.
1 = minimum power
2 = maximum DHW
power
3 = maximum heating
power
During the the chimney
sweep function, the
and/or symbols
do not ash.
LCD FUNCTION
E13 + High heating pressure
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
E54 +
Heating water lling
function ended but
pressure is below min-
imum value for boiler
lling
E58 +
Heating water lling
function ended but
pressure is above max-
imum value for boiler
lling
Boiler off, (antifreeze
protection active)
Boiler in winter (heat-
ing/DHW) and stand-by
Boiler in summer (DHW
only) and stand-by
Boiler with DHW power
request.
The DHW temperature
is displayed.

- 10 -
USER
USER INSTRUCTIONS
2 USER 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, follow the
instructions in section "Antifreeze protec-
tion" on page 15.
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 multi-
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 and hold 17 until both symbols
and appear on the display.
Figure 2.3
12
13
14
15
16
1718
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 17 until the symbol appears on
the display Figure 2.5.

- 11 -
USER
USER INSTRUCTIONS
Figure 2.5
12
13
14
15
16
1718
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 15 (decrease)
and 16 (increase) buttons (Figure 2.5) from
a minimum of approx. 25°C to a maximum
of approx. 85°C or from a minimum of ap-
prox. 50°C to a maximum of 80°C or from a
minimum of approx. 25°C to a maximum of
55°C (see "Selecting the heating tempera-
ture 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
Adjusting the heating temperature with
an external sensor installed
When the optional external sensor is in-
stalled, your boiler will automatically adjust

- 12 -
USER
USER INSTRUCTIONS
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 15 (decrease) and 16 (increase) but-
tons (Figure 2.5).
2.4 Domestic hot water tempera-
ture
The domestic hot water temperature can
be adjusted using the 12 (increase) and
13 (decrease) buttons (Figure 2.5) from a
minimum of approx. 30°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
2.5 Shutdown
Press 17 (Figure 2.11) until the message
OFF appears on the LCD display (Figure
2.12).
Figure 2.11
12
13 15
16
1718

- 13 -
USER
USER INSTRUCTIONS
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).

- 14 -
USER
USEFUL TIPS
3 USEFUL TIPS
3.1 Filling the heating circuit
Figure 3.1
OPEN
CLOSED
Heating circuit
lling cock
Access INFO mode by pressing and holding
18 (Figure 3.2) for 5 seconds until the code
n02 shows on the display (Figure 3.3).
Figure 3.2
12
13
14
15
16
1718
Figure 3.3
bar
RESET
Press 12 (increase) to scroll through the
values until the code n10 “heating water
pressure” and a pressure value of 1.3 bar
(Figure 3.4) appear on the display.
Figure 3.4
bar
RESET
bar
RESET
Open the lling cock in Figure 3.1 located
under the boiler and at the same time check
the heating circuit pressure on the display.
The pressure must be between 1 bar and
1.5 bar (Figure 3.4).
When the operation is complete, close the
lling cock and bleed any air from the ra-
diators.
Press 17 and hold for 5 seconds to exit
INFO mode (Figure 3.2).
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 15
and 16 (Figure 3.5).

- 15 -
USER
USEFUL TIPS
Figure 3.5
12
13
14
15
16
1718
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 3.6).
Figure 3.6
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 8); the boiler is in
lockout mode (Figure 3.7).
Figure 3.7
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.

- 16 -
USER
USEFUL TIPS
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 3.8).
Figure 3.8
bar
RESET
To restore operation, press the reset button
18 (Figure 3.5) 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.
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 12 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 18 (Figure
3.9) and hold for 5 seconds until the code
n02 shows on the display (Figure 3.10).
Figure 3.9
12
13
14
15
16
1718
Figure 3.10
bar
RESET
To scroll through the values, press 12 (in-
crease) and 13 (decrease). Press 17 and
hold for 5 seconds to exit INFO mode (Fig-
ure 3.9).
The table summarises the possible values
visible in INFO mode.

- 17 -
USER
USEFUL TIPS
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)
n10 Heating circuit pressure
n11 DHW ow rate
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)
n29 Number of weeks remaining
until maintenance due
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 19, indicated in Figure
3.11, 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 3.11
19

- 18 -
INSTALLER
TECHNICAL SPECIFICATIONS
4 TECHNICAL SPECIFICATIONS
4.1 Assembly view
Figure 4.1
19
21
38
22
20
36
34
31
3
33
37
27 39
29
32
24
8
23
25
30
26
11
35
40
43 44

- 19 -
INSTALLER
TECHNICAL SPECIFICATIONS
Figure 4.2
3 Heating circuit lling cock
4 Condensate outlet pipe
5 Heating delivery pipe
6 Domestic hot water outlet pipe
7 Gas cock
8 Heating circuit safety valve discharge
pipe
9 Heating return pipe
10 Domestic hot water inlet cock
11 Heating circuit drain cock
19 Flue thermal fuse
20 Heating NTC - Max temperature NTC
21 Primary condensing exchanger
22 Flame detection electrode/ignition
electrode
23 3 bar safety valve
4.2 Schematic diagram
43
44
45
21
22
38
35
27
40
25
30
33
23
7 9
11
4 5 10 6
31
28
24
29
39
34
42 41
32
46
19 20
3
47

- 20 -
INSTALLER
TECHNICAL SPECIFICATIONS
24 Automatic bleed valve
25 Pump
26 Pump bleed cap
27 Gas valve
28 Gas valve inlet tapping point
29 DHW NTC probe
30 Heating transducer
31 Condensate outlet siphon
32 DHW exchanger
33 Three-way valve
34 Three-way valve plug
35 Fan
36 Air/gas mixer
37 Silencer
38 Burner
39 DHW owmeter
40 Expansion tank
41 Domestic hot water lter
42 DHW ow rate limiter (optional)
43 Flue gas exhaust duct
44 Air suction duct
45 Flue gas suction inlet
46 Air suction inlet
47 Integrated by-pass
* To access the Data plate, remove the front
panel from the body as described in the
Maintenance section.