Sime GIULIA SYSTEM 25 User manual

BRAVA DGT HE
25 - 30 - 35
199838
INSTALLATION AND SERVICING INSTRUCTIONS
ENSURE THAT THESE
INSTRUCTIONS ARE LEFT
FOR THE USER AFTER
COMPLETION OF THE
BENCHMARK SECTION
PLEASE READ THE
IMPORTANT NOTICE
WITHIN THIS GUIDE
REGARDING YOUR BOILER
WARRANTY
EN Cod. 6316191 - 08/2013
6333539 - 05/2023 - R1
BRAVA DGT HE
25 - 30 - 35
199838
INSTALLATION AND SERVICING INSTRUCTIONS
ENSURE THAT THESE
INSTRUCTIONS ARE LEFT
FOR THE USER AFTER
COMPLETION OF THE
BENCHMARK SECTION
PLEASE READ THE
IMPORTANT NOTICE
WITHIN THIS GUIDE
REGARDING YOUR BOILER
WARRANTY
EN
Cod. 6316191 - 08/2013
please position here a sticker
from installation pack
BOILER DETAILS
USER, INSTALLATION AND SERVICING INSTRUCTIONS
GIULIA SYSTEM 25
To consult the documentation,
visit our website www.sime.it
Condensing sealed wall-mounted boiler
Cod.
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
199839

2
SAFE HANDLING
IMPORTANT NOTICE
For the first year all of our appliances are protected by our manufacturer’s guarantee which covers both parts and
labour.
As you would expect from Sime Ltd, it is our aim to provide our valued customers with the best in after sales and
service.
To take advantage of any extended warranty offered, all you have to do is to adhere to these 3 simple conditions:
The installation must be carried out to Manufacturers/Benchmark Standards by a Gas Safe Registered
Engineer, and recorded in the installation manual.
The appliance must be registered with both Sime Ltd and Gas Safe within 30 days of installation.
The appliance must be serviced every 12 months, within 30 days of the anniversary of the installation date, by either
Sime Ltd or a Gas Safe registered engineer- ensuring that the Benchmark service record in the installation
manual is completed.
Failure to comply with the above will result in only the 12 month warranty being offered.In the absence of any proof
of purchase, the 12 month warranty period will commence from the date of manufacture of the boiler as shown on the
appliance data plate.
This boiler may require 2 or more operatives to move it into its installation site, remove it from its packaging and
during movement into its installation location. Manoeuvring the boiler may include the use of a sack truck and involve
lifting pushing and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques when performing these tasks and the following precau-
tions should be considered:
– Grip the boiler at the base
– Be physically capable
– Use personal protective equipment as appropriate e.g. gloves, safety footwear.
During all manoeuvres and handling actions, every attempt should be made to ensure the following unless unavoi-
dable and/or the weight is light.
– Keep back straight
– Avoid twisting at the waist
– Always grip with the palm of the hand
– Keep load as close to the body as possible
– Always use assistance
WARNING
Caution should be exercised when performing any work on this appliance.
Protective gloves and safety glasses are recommended.
– Avoid direct contact with sharp edges.
– Avoid contact with any hot surfaces.
NOTICE
Please be aware that due to the wet testing of the appliance, there may some residual water in the hydraulic circuit.
– Protect any surfaces, carpets or floorings.
– Use a suitable container to catch any water that escape when removing the protective caps from the connections.
All descriptions and illustrations provided in this manual have been carefully prepared but we reserve the right to make
changes
and improvements in our products that may affect the accuracy of the information contained in this manual.

3

4
The Benchmark Scheme
Sime 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 the Heating and Hotwater Industry Council.
For more information visit www.centralheating.co.uk.
Please ensure that the installer has fully completed the Benchmark Checklist in the use and maintenance section 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 complyng with the appropriate
Building Regulations (England and Wales).
All installations must be notified 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 regularly to optimise its safety, efficiency and performance.
The service engineer should complete the relevant Service Record on the Benchmark Checklist after each service.
The Benchmark Checklist may be required in the event of any warranty work and as supporting documentation
relating to home improvements in the optional documents section of the Home Information Pack.
Please refer to commissioning instructions for filling in the checklist at the back of this installation guide.
Note: All Gas Safe registered installers carry a ID Card.
You can check your installer is Gas Safe Registered by calling 0800 408 5577
SIME COMBINATION BOILERS
Installer checklist
Important Information
IT IS A STATUTORY REQUIREMENT THAT ALL GAS APPLIANCES ARE INSTALLED BY COMPETENT PERSONS,
IN ACCORDANCE WITH THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS (CURRENT EDITION). The
manufacturer’s instructions must not be taken as overriding any statutory requirements, and failure to comply
with these regulations may lead to prosecution.
No modifications to the appliance should be made unless they are fully approved by the manufacturer.
GAS LEAKS: DO NOT OPERATE ANY ELECTRICAL SWITCH, OR USE A NAKED FLAME. TURN OFF THE GAS SUPPL
Y
AND VENTILATE THE AREA BY OPENING DOORS AND WINDOWS CONTACT THE GAS EMERGENCY SERVICE
ON
0800111999.
Please remember to carry out the following checks after installation. This will achieve complete customer
satisfaction, and avoid unnecessary service calls. A charge will be made for a service visit where the fault is not
due to a manufacturing defect.
Has a correct by-pass been fitted and adjusted?
Has the system and boiler been flushed?
Is the system and boiler full of water, and the correct pressure showing on the pressure gauge?
Is the Auto Air Vent open?
Has the pump been rotated manually?
Is the gas supply working pressure correct?
Is the boiler wired correctly? (See installation manual).
Has the D.H.W. flow rate been set to the customer requirements?
Has the customer been fully advised on the correct use of the boiler, system and controls?
Has the Benchmark Checklist in the use and maintenance section of this manual, been completed?
––

5
Dear Customer,
Thank you for purchasing a
Sime GIULIA SYSTEM boiler, a
new-generation condensing modulating device possessing
technical and performance characteristics capable of satisfy-
ing your heating requirements with the utmost safety and with
limited running costs.
RANGE
MODEL CODE GAS COUNCIL
NUMBER
GIULIA SYSTEM 25 8116692 GCN 41-283-66
NOTE: Some models may NOT be available in some countries.
COMPLIANCE
Our company declares that GIULIA SYSTEM boilers comply with
the following directives:
– Gas Appliances EU Regulation 2016/426
– Boiler Efficiency Directive 92/42/EEC
– Low Voltage Directive 2014/35/UUE
– Electromagnetic Compatibility Directive 2014/30/EU
– Ecodesign Directive 2009/125/EC
– Regulation (UE) N. 811/2013 - 813/2013
– Energy labelling Regulation (EU) No. 2017/1369
SYMBOLS
a
WARNING
To indicate actions which, if not carried out correctly,
can result in injury of a general nature or may dam-
age or cause the appliance to malfunction; these
actions therefore require particular caution and ad-
equate preparation.
f
ELECTRICAL HAZARD
To indicate actions which, if not carried out correct-
ly, could lead to injury of an electrical nature; these
actions therefore require particular caution and ad-
equate preparation.
d
DO NOT
To indicate actions which MUST NOT BE carried out.
m
CAUTION
To indicate particularly important and useful infor-
mation.
MANUAL STRUCTURE
This manual is organized as follows.
USER INSTRUCTIONS
TABLE OF CONTENTS 9
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS 15
INSTALLATION AND SERVICING
INSTRUCTIONS
TABLE OF CONTENTS 25

6
SAFETY WARNINGS AND REGULATIONS
m
WARNINGS
– After having unpacked the boiler en-
sure that it is undamaged and com-
plete including the valve pack, hang-
ing bracket and template.
– The appliance must be used as in-
tended.
Sime declines all responsi-
ble for any injury or damage to per-
sons, animals,or property as a result
of improper installation, adjustment,
maintenance or use.
– In the event of water leaks, discon-
nect the appliance from the mains
power supply, close the water mains
and seek help from a qualified engi-
neer.
– Periodically check that the operating
pressure of the water heating system
when cold is
1-1.2 bar . If required, in-
crease the pressure or seek help from
a qualified engineer.
– If the appliance is not used for a long
period of time, the following opera-
tions must be carried out:
-
set the main isolation switch to
"OFF";
- close the gas and water valves for
the water heating system.
– To ensure continued efficient oper-
ation of the appliance it is recom-
mended that it is serviced regular-
ly, at least once a year. This is also
a condition of the boiler warranty.
It is the law that any ser-
vice or repair is carried out by a
Gas Safe Registered engineer.
Services must be recorded in the
maintenance section of this installa-
tion guide.
– If the power cable is damaged, replace
it with a cable ordered as a spare part
with the same characteristics (type
X). Assembly must be by carried out
by a qualified professional.
m
WARNINGS
– It is recommended that all operators
read this manual carefully in order to
use the appliance in a safe and ration-
al manner.
–
This manual is an integral part of the
appliance. It must therefore be kept
for future reference and must always
accompany the appliance.
–
Installation and maintenance of this ap-
pliance must be carried out by a qual-
ified company or by a professionally
qualified technician in accordance
with the instructions contained in the
manual. Once the work is complete,
the company or technician will issue
a declaration of conformity with na-
tional and local technical standards
and legislation in force in the country
where the appliance will be used.
–
Any repairs on the appliance must be
carried out solely by professional-
ly qualified personnel, using original
spare parts only. Failure to comply
with these instructions can jeopard-
ise the appliance’s safety and void the
warranty with immediate effect.
–
Fonderie SIME S.p.A. reserves the right
to make improvements to its prod-
ucts at any time without prior notice,
without compromising their essential
characteristics. The graphic illustra-
tions and/or images in this document
may show optional accessories that
vary according to the country in which
the appliance is used.

7
RESTRICTIONS
d
DO NOT
– To allow children under the age of 8 to
use the appliance. The appliance can
be used by children no younger than 8
years old, by people with physical or
cognitive disabilities, and by people
lacking experience or the necessary
knowledge, provided that they are su-
pervised or have been instructed on
how to use the appliance safely and
that they understand the risks asso-
ciated with it.
– To allow children to play with the ap-
pliance.
– To allow unsupervised children to per-
form user maintenance and cleaning.
– To use electrical devices or applianc-
es such as switches, electrical appli-
ances etc if you can smell gas. If this
should happen:
-
open the doors and windows to ven-
tilate the room;
- turn the gas off at the meter;
- call the emergency service 0800
111999.
– To touch the appliance with bare feet
or with any wet part of the body.
– To carry out any repair, maintenance
or cleaning operation before hav-
ing disconnected the appliance from
the mains power by setting the main
switch to "OFF", and closing the gas
supply.
– To modify the safety or adjustment
devices without authorization and in-
structions from the manufacturer.
d
DO NOT
– To block the condensate drain.
– To pull, detach or twist the electrical
cables coming out of the appliance
even if the appliance is disconnected
from the mains power supply.
– To expose the boiler to atmospher-
ic agents. These boilers can also be
installed in partially covered areas,
as per EN 15502, with a maximum
ambient temperature of 60 °C and a
minimum ambient temperature of - 5
°C. It is generally advisable to install
the boilers below weathered roofs, on
the balcony or in a protected niche, to
protect them from exposure to weath-
ering agents (rain, hail and snow). All
boilers provide a standard antifreeze
function.
– To block or reduce the size of the ven-
tilation openings of the room where
the appliance is installed, if present.
– Remove the mains power and gas
supply from the appliance if the ex-
ternal temperature could fall below
ZERO (risk of freezing).
– To leave containers with flammable
substances in the room where the ap-
pliance is installed.
– To dispose of the packaging material
irresponsibly as it could be danger-
ous. Packaging must be disposed of
as specified by the legislation in force
in the country where the appliance
will be used.

8

9
USER INSTRUCTIONS
TABLE OF CONTENTS
VERY IMPORTANT!
PLEASE MAKE SURE YOUR COMMISSIONING CHECKLIST AND THE SERVICE INTERVAL RECORDS ENCLOSED
ARE FILLED IN CORRECTLY.
ALL GAS SAFE REGISTERED INSTALLERS CARRY A GAS SAFE ID CARD.
BOTH SHOULD BE RECORDED IN YOUR COMMISSIONING CHECKLIST AND A SERVICE INTERVAL RECORDS.
YOU CAN CHECK YOUR INSTALLER IS GAS SAFE REGISTERED
BY CALLING ON 0800 408 5500 OR ALTERNATIVELY WWW.GASSAFEREGISTER.CO.UK
1 USING THE BOILER GIULIA SYSTEM 25 10
1.1 Control panel ..................................10
1.2 Preliminary checks .............................11
1.3 Ignition .......................................11
1.4 Adjusting the delivery temperature ................11
1.5 Fault / malfunction codes ........................12
2 SHUTDOWN 12
2.1 Temporary shutdown............................12
2.2 Shutting down for long periods ...................12
3 MAINTENANCE 13
3.1 Servicing......................................13
3.2 External cleaning...............................13
3.2.1 Cleaning the case ..................... 13
4 DISPOSAL 13
4.1 Disposal of the equipment (European Directive
2012/19/EU) ...................................13

10
1 USING THE BOILER GIULIA SYSTEM 25
1.1 Control panel
3
1 42 2
2 2
2
Fig. 1
1 KNOBS
tThe heating knob allows the user to set the flow tem-
perature to between 20 and 80°C during normal oper-
ation.
2 FUNCTIONAL BUTTONS
sPress for more than one second and release to step
through the operating modes (Stand-by – Summer –
Winter).
<This allows the engineer to scroll through the param-
eters or decrease the values.
>This allows the engineer to scroll through the parame-
ters or increase the values.
bIf pressed once or more times for at least 1 second
during normal operation, this button allows the user to
visualize on display the system pressure.
oThis allows the engineer to confirm the selected pa-
rameter or to modify the value.
RThis allows the engineer to reset the appliances from a
lockout failure.
cProgramming connector cover plug.
NOTE: pressing any one of these buttons for more than 30
seconds generates a fault on the display without preventing
boiler operation. The warning disappears when the button is
released.
3 DISPLAY
l
“SUMMER” . This function is NOT USED on these boil-
ers. This symbol appears when the boiler is operating
in Summer mode (used when commissioning the boil-
er). If the symbols land nare flashing, this indi-
cates that the chimney sweep function is active.
n
“WINTER” . This symbol appears when the boiler is op-
erating in Winter mode. If no operating modes have
been enabled both symbols land nwill be off.
R
“RESET REQUIRED” . This message only appears if there
is a malfunction which must be or may be restored
manually.
t
“HEATING” . This symbol is present during heating op-
eration or when the chimney sweep function is operat-
ing; it flashes during the heating set point selection.
f
“LOCKOUT” DUE TO NO FLAME .
F
“FLAME LIT" .
K
“ALARM" . This indicates that a fault has occurred. The
number specifies the cause which generated the alarm
(see section "Fault / malfunction codes".
H
"MAINTENANCE REQUEST" . If active, it shows it is time
to perform maintenance on the boiler.
4 (NOT USED on these boilers)

11
1.2 Preliminary checks
a
WARNING
– Should it be necessary to access the areas in the
bottom part of the appliance, make sure that the
system components and pipes are not hot (risk of
burning).
– Before replenishing the heating system, put on
protective gloves.
Prior to use the
GIULIA SYSTEM boiler must be installed and
commissioned by a Gas Safe Registered engineer. It may be
necessary for the user to occasionally have to start the boiler,
for instance after a holiday or after an interruption of the gas
supply. In these cases the following operations must be car-
ried out.
– check that the gas isolation and water system valves are
open
– using the pressure gauge (1) check that the pressure in the
heating system, when cold, is
1-1.2 bar . If the pressure is
less than this, use the external filling device to repressurise
the system to
1-1.2 bar
– ensure that the filling device is turned off after use.
1
Fig. 2
1.3 Ignition
After having carried out the preliminary checks, proceed as
follows:
– set the main system switch to "ON"
ON
Fig. 3
Once the boiler has been operated in "SUMMER mode"l
"WINTER mode" ncan be selected by pressing and holding
the button sfor at least 1 second. The internal temperature
of the boiler will appear on the display. Ensure that any timers
and room thermostats are in the on position. The twill ap-
pear on the display and the boiler will ignite.
1.4 Adjusting the delivery temperature
Should you wish to increase or decrease the boiler delivery
temperature, turn the dial tto the desired setpoint. The val-
ue can be set to between 20°C and 80°C.
Fig. 4

12
1.5 Fault / malfunction codes
If a fault/malfunction is detected during boiler operation, the
message
"AL" will appear on the display followed by the fault
code.
If you see alarm
“02” (low water pressure in the system):
– press the button >
(bar) to view the value pression on the
display or using the pressure gauge (1) check that the pres-
sure in the heating system, when cold, is
1-1.2 bar . If the
pressure is less than this, use the external filling device to
repressurise the system to
1-1.2 bar
– ensure that the filling device is turned off after use
– press and hold the oRbutton for more than 3 seconds
and check whether normal operating conditions are re-
stored.
1
Fig. 5
If you see alarm “06” (no flame detected) and “07” (safety ther-
mostat intervention):
– press and hold the oRbutton for more than 3 seconds
and check whether normal operating conditions are re-
stored.
If this operation is not successful, ONLY ONE MORE ATTEMPT
can be made, therefore:
– close the gas cock
– isolate the power supply
– contact the Qualified Technical Personnel.
OFF
Fig. 6
m
CAUTION
Should you see an alarm not described here, contact a
qualified technical professional
2 SHUTDOWN
2.1 Temporary shutdown
To temporarily interupt the boiler operation press and hold the
button sfor at least one second, once if in "WINTER mode"
nor twice if in "SUMMER mode" l.
"- -" will appear on the
display the boiler will be in STAND-BY. The boiler anti freeze
function will be enabled.
f
ELECTRICAL HAZARD
The boiler will still be powered.
If the user is away temporarily, for a weekend, short trip etc
and if the outside temperature is at ZERO:
– press and hold the button sonce if in "WINTER mode" n
or twice if in "SUMMER mode" lto put the boiler into
stand-by
– isolate the power supply
– isolate the gas cock.
OFF
Fig. 7
m
CAUTION
If the outside temperature might fall below ZERO,
since the appliance is equipped with an "antifreeze
function"
– ONLY PUT THE BOILER INTO STAND-BY
– leave the main system switch set to "ON" (boiler
is powered)
– leave the gas cock open.
2.2 Shutting down for long periods
If the boiler is to be left unused for a long period, the following
operations need to be carried out:
– press and hold the button sfor at least 1 second, once if in
"WINTER mode" nor twice if in "SUMMER mode" lto
put the boiler into stand-by
"- -" will appear on the display

13
– isolate the power supply
OFF
Fig. 8
– isolate the gas cock
– close the heating and domestic hot water isolation valves
– drain the heating and domestic hot water system if there is
the risk of freezing.
m
CAUTION
Contact the Qualified Technical Personnel if the pro-
cedure described above cannot be easily carried out.
3 MAINTENANCE
3.1 Servicing
As a condition of the warranty and to ensure correct operation
and efficiency, it is important that the boiler is serviced every
12 months, within 30 days of the anniversary of the installation
date ensure the required information is recorded in the Gas
Boiler System Service Interval Record (Benchmark).
m
CAUTION
Maintenance must ONLY be carried out by qualified
professionals who follow the indications provided in
the INSTALLATION AND MAINTENANCE INSTRUC-
TIONS.
3.2 External cleaning
a
WARNING
– Should it be necessary to access the areas in the
bottom part of the appliance, make sure that the
system components and pipes are not hot (risk of
burning).
– Before performing any maintenance, put on pro-
tective gloves.
3.2.1 Cleaning the case
When cleaning the cladding, use a cloth dampened with soap
and water or alcohol for stubborn marks.
d
DO NOT
Do not use abrasive products.
4 DISPOSAL
4.1 Disposal of the equipment (European
Directive 2012/19/EU)
At the end of their life span, the appliance
and electrical and electronic devices coming
from households or classifiable as house-
hold waste must be delivered to appropriate
waste collection systems, in accordance with
the law and with Directive 2012/19/EU. This
product was designed and manufactured for
minimising its impact on the environment and
on human health, but it contains components
that could be detrimental if managed improp-
erly. The symbol (crossed-out wheelie bin)
depicted here and also appearing on your ap-
pliance means that the appliance at the end of
its life must be managed in accordance with
the law and treated as electrical and electron-
ic waste. Before delivering the appliance for
its disposal, consult the applicable provisions
of the laws in force in the country where the
appliance is used and get information on the
authorised waste disposal facilities by con-
tacting the relevant local offices.
d
DO NOT
dispose of the product with urban waste.

14

15
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS
5 DESCRIPTION OF THE APPLIANCE 16
5.1 Characteristics ................................16
5.2 Check and safety devices ........................16
5.3 Identification ..................................16
5.4 Structure .....................................17
5.5 Technical features ..............................18
5.6 Main water circuit ..............................19
5.7 Sensors.......................................20
5.8 Expansion vessel ...............................20
5.9 Circulation pump ...............................20
5.10 Control panel ..................................21
5.11 Wiring diagram ................................22
5.11.1 "Y" type ............................. 23
5.11.2 "S" type ............................. 23

16
5 DESCRIPTION OF THE APPLIANCE
5.1 Characteristics
GIULIA SYSTEM are condensing wall mounted boilers which
Sime has produced for installation into domestic properties
for system heating. The main design choices made by
Sime for
the
GIULIA SYSTEM boilers are:
– the total pre-mix microflame burner combined with a steel
heat exchanger
– room sealed, Type C appliance. Suitable for use on sealed
heating systems
– the microprocessor electronic control board, which makes
the heating production system easier to manage offers the
option to be connected to room thermostats and also to an
external sensor. Where connected to an external sensor, the
boiler temperature varies on the basis of the external tem-
perature, according to the selected optimal climatic curve.
This provides significant energy and cost savings.
Other special features of the
GIULIA SYSTEM boilers are:
– the anti-freeze function which activates automatically if the
temperature of the water inside the boiler falls below the
threshold of the value set at parameter "tS 1.0" and , if there
is an external sensor, if the external temperature falls be-
low the threshold of the value set at parameter "tS 1.1".
– anti jamming function of the pump. This activates automat-
ically every 24 hours if no request for heat has been made
– the chimney sweep function lasts 15 minutes and makes
the job of the qualified technician easier when measuring
the parameters and combustion efficiency
– screen display of the operating and self-diagnostic param-
eters with error code display when the fault occurs. This
makes repair interventions easier and allows appliance op-
eration to be restored correctly.
5.2 Check and safety devices
The GIULIA SYSTEM boilers are equipped with the following
check and safety devices:
– thermal safety thermostat 100°C
– 3 bar relief valve
– heating water pressure switch
– delivery sensor
– exhaust sensor.
d
DO NOT
Do not commission or operate the appliance with
safety devices which do not work or which have been
tampered with.
a
WARNING
Safety device may only be replaced by professional
qualified personnel using
Sime original spare parts.
5.3 Identification
The GIULIA SYSTEM boilers can be identified by means of:
1 Packaging label: this is located on the outside of the pack-
aging and provides a code, the serial number of the boiler
and the bar code
2 Energy Efficiency Label: this is positioned on the outside of
the packaging to notify the User of the level of energy sav-
ings and reduced environmental pollution produced by the
appliance
3 Technical Data Plate: this is located on the side of the ap-
pliance and provides the technical data, appliance perfor-
mance and any other information required by law.
4 Sticker of product identification .
3
III
A
B
C
D
E
F
G
2015 811/2013
Cod. 6244745
dB
kW
A++
A+
A
B
C
D
E
F
G
Fonderie SIME S.p.A.
Via Garbo, 27 - 37045 Legnago - VR (Italy) - Tel. [phone]
MIA HE 25 8116600
9999999999
230V~ - 50Hz - 84 W
2018
4,00
20,00
24,00
4,00
2,45
---
85
60
11,0
NOx class 6
1312CR6307
IP X5D
1312
3,8019,60
MADE IN ITALY
CALDAIA A CONDENSAZIONE - CONDENSING BOILER - CALDERA DE CONDENSACION - CALDEIRA A
CONDENSACAO - CHAUDIERE A CONDENSATION - CONDENSATIEKETEL - GASBRENNWERTKESSEL -
ȂǽǻǿȊǺ ȉȋȃȇȋȁȄȎȉǿȉ -KONDENZACIJSKI K OTEL - PLYNOVÝ KONDENZ$þNI KOTEL - CONDENSARE
CAZAN -K OCIOLK ONDENSACYJNY- KONDENZÁCIÓS KAZÁNOK - ɅɉɈȿɀɈɌȻɑȲɄɈɃɄ ɅɉɍɀɆ
Q max = Q min =
Q max = Q min =
PMW = T max =
T max =PMS =
P max 80-60°C = P min 80-60°C =
L
L
°C
°C
kW
kW
kW
kW
kW kW
l/min (EN 13203)
PIN n.
n
n
n
n
wnwn
P max 50-30°C = P min 50-30°C =
21,20
kW 4,20 kWnn
G20 G31 G20 G31
G20 G31 G20 G31
20,00
kW
19,60 kW
21,20
kW
4,00 kW
3,80 kW
4,20 kW
24,00
kW 4,00 kW
3 bar 0,3 MPa
7 bar 0,7 MPa
G20 20 mbar
G31 37 mba r
II2H3P
GR-SI-CZ-SK-LT-HR G20/G31 20/37 mbar (2/3,7 kPa) B23P-B53P-C13-C43-C53-C63-C83
I2E
PL-RO G20 20mbar (2 kPa) B 23P-B53P-C13-C43-C53-C63-C83
I2H
HU G20 25 mbar (2,5 kPa) B23P-B53P-C13-C43-C53-C63-C83
2
1 2
3
4
4
Code
Model
Serial/N.
GC No
_ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _
_ _ - _ _ _ - _ _
MIA
MIA
GIULIA
1
GIULIA
Fig. 9
m
CAUTION
Tampering with, removing or failing to display the
identification plate or carrying out any other oper-
ation which does not allow safe identification of the
product or which may hinder installation and main-
tenance operations.

17
5.4 Structure
10
14
13
12
11
1
2
7
17
18
19
20
222324 21
25
3
5
6
4
98
15
16
1 Combustion chamber door
2 Air/gas duct
3 Safety thermostat
4 Air-gas mixer
5 Boiler delivery sensor (SMC)
6 Condensate siphon
7 Control panel
8 Venturi air exhaust pipe
9 Gas valve
10 Pressure gauge (MA)
11 Relief valve (VS)
12 Water pressure transducer (TPAC)
13 System circulator pump
14 System drainage outlet (SI)
15 Automatic bleed valve
16 Automatic by-pass
17 Fan (V)
18 Expansion vessel (VE)
19 Ignition/detection electrode (EAR)
20 Flame viewing window
21 Air inlet closing plate (separate
ducts)
22 Exhaust sensor (SF)
23 Smoke outlet duct (CSFU)
24 Boiler air inlet duct (concentric
ducts)
(CAA)
25 Plug/socket for attaching the air in-
let pipe (separate ducts)
Fig. 10

18
5.5 Technical features
DESCRIPTION
GIULIA SYSTEM
25
CERTIFICATIONS
Country of intended installation GB
Fuel G20 /G31
PIN number 1312DN6705
Category II2H3P
Type C13 - C33
Class NOx(*) 6 (< 56 mg/kWh)
DHW rated useful heat output kW 0
HEATING PERFORMANCE
HEAT INPUT (**)
Nominal flow (Qnmax) kW 24
Minimum (G20-G31) (Qnmin) kW 4,8 / 5,5
HEAT OUTPUT
Nominal (80-60°C) (Pnmax) kW 23,6
Nominal (50-30°C) (Pnmax) kW 25,6
Minimum G20 (80-60°C) (Pnmin) kW 4,6
Minimum G20 (50-30°C) (Pnmin) kW 5,0
Minimum G31 (80-60°C) (Pnmin) kW 5,3
Minimum G31 (50-30°C) (Pnmin) kW 5,8
EFFICIENCY
Max useful efficiency (80-60°C) % 98,5
Min useful efficiency (80-60°C) % 95,7
Max useful efficiency (50-30°C) % 106,8
Min useful efficiency (50-30°C) % 104,9
Useful efficiency at 30% of load (40-30°C) % 108,7
Thermal efficiency (EEC 92/42)
Losses after shutdown at 50°C W 82
ENERGY PERFORMANCE
HEATING
Heating seasonal energy efficiency class A
Heating seasonal energy efficiency % 93
Sound power dB(A) 55
ELECTRICAL SPECIFICATIONS
Power supply voltage V 230
Frequency Hz 50
Absorbed electrical power (Qnmax) W 78
Absorbed electrical power at (Qnmin) W 56
Absorbed electrical power in stand-by W 4
Electrical protection degree IP X5D
COMBUSTION DATA
Smoke temperature at Max/Min flow (80-60°C) °C 75 / 67
Smoke temperature at Max/Min flow (50-30°C) °C 58 / 50
Smoke flow Max/Min g/s 11,3 / 2,3
CO2at Max/Min flow rate (G20) % 9,3 / 9,0
CO2at Max/Min flow rate (G31) % 10,2 / 10,0
NOx measured mg/kWh 32
Gas consumption at Max/Min flow rate (G20) m3/h 2,54 / 0,51
Gas consumption at Max/Min flow rate (G31) kg/h 1,86 / 0,43
Gas supply pressure (G20/G31) mbar 20 / 37
kPa 2 / 3,7
(*) NOx class according to UNI EN 15502-1:2021
(**) Heat input calculated using the lower heat output (Hi)

19
DESCRIPTION
GIULIA SYSTEM
25
NOZZLES  GAS
Number of nozzles No. 1
Nozzle diameter (G20-G31) mm 5,3 / 4,2
TEMPERATURE  PRESSURE
Max operating temperature (T max) °C 85
Heating adjustment range °C 20÷80
Max operating pressure (PMS) bar 3
kPa 300
Water content in boiler l 2,45
Lower Heat Output (Hi)
G20 Hi. 9.45 kW/m
3
(15°C, 1013 mbar) - G31 Hi. 12.87 kW/kg (15°C, 1013 mbar)
5.6 Main water circuit
1 14
15 16 17
2
3
4
5
67
8
9
10
11
12
13
Sc M G R S
Fig. 11
KEY:
M System flow
R System return
G Gas supply
S Safety valve outlet
Sc Condensate outlet
1 Primary heat exchanger group
2 Fan (V)
3 Safety thermostat
4 Heating probe
5 Automatic by-pass
6 Condensate siphon outlet
7 Gas valve
8 System drainage outlet (SI)
9 System relief valve (VS)
10 System circulator pump
11 Automatic bleed valve
12 Pressure gauge (MA)
13 Water pressure transducer (TPAC)
14 Expansion vessel (VE)
15 System flow cock (if supplied)
16 Gas cock (if supplied)
17 System return cock (if supplied)

20
5.7 Sensors
The sensors installed have the following characteristics:
– Dual sensor (thermal safety/output) NTC R25°C; 10kΩ
β25°-85°C: 3435
– External temperature sensor NTC R25°C; 10kΩ β25°-85°C:
3435
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.
TR
0°C 1°C 2°C 3°C 4°C 5°C 6°C 7°C 8°C 9°C
Resistance R (Ω)
0°C 27279
17959
12090
8313
5828
4161
3021
2229
1669
1266
973
26135
17245
11634
8016
5630
4026
2928
2164
1622
1232
25044
16563
11199
7731
5440
3897
2839
2101
1577
1199
24004
15912
10781
7458
5258
3773
2753
2040
1534
1168
23014
15289
10382
7196
5082
3653
2669
1982
1491
1137
22069
14694
9999
6944
4913
3538
2589
1925
1451
1108
21168
14126
9633
6702
4751
3426
2512
1870
1411
1079
20309
13582
9281
6470
4595
3319
2437
1817
1373
1051
19489
13062
8945
6247
4444
3216
2365
1766
1336
1024
18706
12565
8622
6033
4300
3116
2296
1717
1300
998
10°C
20°C
30°C
40°C
50°C
60°C
70°C
80°C
90°C
100°C
5.8 Expansion vessel
The expansion vessel installed on the boilers has the following
characteristics:
Description U/M
GIULIA SYSTEM
25
Total capacity l 7,0
Prefilling pressure kPa 100
bar 1,0
Useful capacity l 4,45
Maximum system
content (*) l 110
(*) Conditions of:
Average operating temperature 70°C (with high tempera-
ture system 80/60°C)
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the
maximum system content (as indicated in the ta-
ble) an additional expansion vessel must be fitted.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 me-
tres, increase the prefilling pressure of the expan-
sion vessel and the system when cold by 0.1 bar
for each meter increase.
5.9 Circulation pump
The flow-head performance curve available for the heating
system is shown in the graph below.
RESIDUAL HEAD (mbar)
0
0 800 1000 14001200600400200
100
200
300
400
500
600
WATER FLOW RATE (l/h)
Fig. 12
m
CAUTION
The appliance is equipped with a by-pass which en-
sures water circulation in the boiler when thermo-
static valves are used in the system. The heating sys-
tem design should incorporate a room thermostat.
Thermostatic radiator valves fitted to all radiators
except the room where the room thermostat is fit-
ted. Properties with floor areas exceeding 150squre
metres should be zoned.