Immergas CAESAR EXTRA 11 Product manual

CAESAR EXTRA
11-14
Wall-hung instantaneous water
heaters open chamber
and fan assisted for outdoors
(Type A2)
IE
Instructions and warnings
Installer
User
Maintenance technician
*1.042039ENG*
*1.042039ENG*

e manufacturer declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without forewarning.
Dear Customer,
Congratulations for having chosen a top-quality Immergas product, able to assure well-being and safety for a long period of time. As an Immergas Customer,
you can also count on a qualied aer-sales service, prepared and updated to guarantee constant eciency of your water heater. Read the following pages
carefully: you will be able to draw useful tips on the proper use of the device, compliance with which will conrm your satisfaction with the Immergas product.
For assistance and routine maintenance, contact Authorised Service Centres: they have original spare parts and are specically trained directly by the manufacturer.
General warnings
All Immergas products are protected with suitable transport packaging.
e material must be stored in a dry place protected from the weather.
e instruction booklet is an integral and essential part of the product and must be given to the new user in the case of transfer or succession of ownership.
It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation, use and maintenance stages.
is instructions manual provides technical information for installing Immergas water heaters. As for the other issues related to water heater installation (e.g.
safety in the work site, environment protection, injury prevention), it is necessary to comply with the provisions of the regulations in force and the principles
of good practice.
Installation and maintenance must be performed in compliance with the regulations in force, according to the manufacturer's instructions and by professionally
qualied sta, intended as sta with specic technical skills in the system sector, as envisioned by the Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kits and devices can cause unexpected problems for people,
animals and objects. Read the instructions provided with the product carefully to ensure proper installation.
Maintenance must be carried out by skilled technical sta. e Authorised Aer-Sales Service represents a guarantee in terms of qualications and professionalism.
e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and therefore potentially
dangerous.
If errors occur during installation, operation and maintenance, due to non-compliance with technical laws in force, standards or instructions contained in
this book (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and extra-contractual liability for any damage and
the appliance warranty is invalidated.
e company IMMERGAS S.p.A., with registered oce in via Cisa Ligure 95 42041 Brescello (RE), declares that the design, manufacturing and aer-sales
assistance processes comply with the requirements of standard UNI EN ISO 9001:2015.
For further details on the product CE marking, request a copy of the Declaration of Conformity from the manufacturer, specifying the appliance model
and the language of the country.

INDEX
USER pageINSTALLER page MAINTENANCE TECHNICIAN page
1 Water heater installation.........................5
1.1 Installation recommendations...............5
1.2 Main dimensions. ....................................6
1.3 Antifreeze protection. .............................7
1.4 Gas connection. .......................................7
1.5 Hydraulic connection..............................7
1.6 Electrical connection. .............................7
1.7 Gas system commissioning....................8
1.8 Water heater start up (ignition).............8
1.9 Procedure for rst ignition,
preparation to use the appliance............ 8
1.10 Water heater components.......................9
2 Instructions for use and maintenance 10
2.1 Cleaning and maintenance...................10
2.2 General warnings...................................10
2.3 Quick appliance operation guide.........10
2.4 Control panel. ........................................11
2.5 Faults and screen displays.....................11
2.6 Emptying the water heater....................12
2.7 Antifreeze protection. ...........................12
2.8 Cleaning the case...................................12
2.9 Decommissioning..................................12
2.10 Temporary deactivation........................12
2.11 Gas system not used for periods over 12
months. ...................................................12
3 Check and maintenance .......................13
3.1 Hydraulic diagram.................................13
3.2 Wiring diagram......................................14
3.3 Service Menu..........................................14
3.4 Possible problems and their causes.....16
3.5 Converting the water heater to other
types of gas. ............................................16
3.6 Check the network pressure (minimum
power supply pressure - only with
appliances operating with methane)...17
3.7 Yearly appliance check
and maintenance....................................17
3.8 Casing removal. .....................................18
3.9 Combustion parameters. ......................19
3.10 Technical data. .......................................19
3.11 Product che (in compliance with
Regulation 812/2013)............................20
3.12 Parameters for lling
in the package che...............................21

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450 mm
300 mm
350 mm
50 mm 50 mm
INSTALLERUSER
MAINTENANCE TECHNICIAN
1 WATER HEATER INSTALLATION
1.1 INSTALLATION
RECOMMENDATIONS.
e water heaters have been designed for wall
installation only, for the production of domestic
hot water in domestic and similar uses.
e place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural), such as to al-
low for (always in safe, ecient and comfortable
conditions):
- installation (according to the provisions of
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (outdoors in the place for loading and
transporting the appliances and components)
as well as their eventual replacement with
appliances and/or equivalent components.
In the case of wall installation the wall surface
must be smooth, without any protrusions or
recesses enabling access to the rear part. ey
are not designed to be installed on plinths or
oors (Fig. 1).
e water heater is classied as:
- Type A2water heater, it does not require ue
exhaust/air intake systems.
Combustion products are exhausted from the
front grid.
Only professionally qualified companies are
authorised to install Immergas gas appliances.
Installation must be carried out according to
regulation standards, current legislation and in
compliance with local technical regulations and
the required technical procedures.
Attention: it is forbidden to install water heaters
removed from other systems. e manufacturer
declines all liability in the event of damage caused
by water heaters removed from other systems or
for any non-conformities with such equipment.
Attention: before commissioning the water
heater, if it is operated with LPG, make sure
parameters 2 and 13 on page 15 have been set
correctly.
Installation of the water heater when powered
by LPG must comply with the rules regarding
gases with a greater density than air (remember,
as an example, that it is prohibited to install sys-
tems powered with the above-mentioned gas in
rooms where the oor is at a lower quota that the
average external country one). Before installing
the appliance, ensure it has been delivered in
perfect condition; if in doubt, contact the supplier
immediately.
Packing materials (staples, nails, plastic bags,
polystyrene foam, etc.) constitute a hazard and
must be kept out of the reach of children. If
the appliance is enclosed between two pieces
of furniture, ensure sucient space for normal
servicing; therefore it is essential to leave the
minimum distances indicated in Fig. 2 and 3
around it.
Keep all ammable objects away from the ap-
pliance (paper, rags, plastic, polystyrene, etc.).
It is recommended not to position household
appliances under the water heater because they
could undergo damage in the case of leaks from
the hydraulic ttings. If this is not the case, the
manufacturer cannot be considered liable for
any damage caused to the household appliances.
For the aforementioned reasons, we recommend
not placing furnishings, furniture, etc. under the
water heater.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o and contact an
authorised company (e.g. the Authorised Tech-
nical Assistance centre, which has specically
trained sta and original spare parts). Do not
attempt to modify or repair the appliance alone.
Failure to comply with the above implies personal
responsibility and invalidates the warranty.
• Installation Standards:
- this water heater was designed for only
outdoor installation in a partially protected
place. Verify that the installation place is an
external environment with natural aeration
and ventilation, without stagnant areas for
combustion products, which must be quickly
dispersed by natural convection or by wind.
- It is absolutely prohibited to plug the combus-
tion products discharge grid at the front of
the appliance and the combustion air intake
grid at the rear with rags, paper or anything
else.
- Do not install this appliance near a place
with an atmosphere containing grease and/
or corrosive dust or vapours.
- It is prohibited to install it inside any room
as the nominal heat input exceeds 15 kW.
- Installation on the vertical projection of
cooking hobs is forbidden.
- It is forbidden to install the water heater
inside a closed recessed frame (e.g. Omni
Container).
- e appliance was designed to be installed
only outdoors in a partially protected place.
- It must be protected against the direct action
of rain and snow, leaves or other agents.
- e water heater cannot be installed in the
vicinity of heat sources.
Attention: wall mounting of the water heater
must guarantee stable and ecient support for the
generator.
e fastening plugs (standard supply) are only to be
used to x the water heater to the wall; they only
ensure adequate support if inserted correctly (ac-
cording to technical standards) in walls made of
solid or semi-hollow brick or block. In the case of
walls made ofhollowbricks or blocks,partitionswith
limited static properties, or in any case walls other
than those indicated, a static test must be carried out
on the mounting system.
ese appliances are used to heat water to below
boiling temperature in atmospheric pressure.
ey must be connected to a DHW distribution
network suited to their performance and power.
YES NO

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Caesar Extra 11
Caesar Extra 14
S
A
S
A
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.2 MAIN DIMENSIONS.
CONNECTIONS
GAS DOMESTIC HOT WATER
GAC AF
3/4” 1/2” 1/2”
Key:
AC - Domestic hot water outlet
AF - Domestic hot water inlet
G - Gas supply
V - Electrical connection
A - Intake
S - Exhaust

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INSTALLERUSER
MAINTENANCE TECHNICIAN
1.3 ANTIFREEZE PROTECTION.
Minimum temperature. If the water heater is
installed in places where the temperature falls be-
low 0°C, the connection pipes must be insulated.
Antifreeze operation.
e antifreeze consists of electric resistances ap-
plied on the DHW circuit of the product and the
thermostat manages its activation and protects
the appliance at temperature as low as -15°C.
e thermostat triggers the resistances when the
temperature reaches 5°C. e resistances stay
on until the temperature rises to 15°C, at which
point the thermostat triggers and deactivates the
antifreeze circuit.
Water heater anti-freeze protection is thus ensured
only if:
- the water heater is correctly connected to elec-
tricity power supply circuits;
- the main switch is on;
- the connection pipes are insulated.
If there is no gas supply (or the water heater has an
ignition failure block) the appliance could freeze.
e warranty does not cover damage due to inter-
ruption of the electrical power supply and failure
to comply with that stated on page 5.
1.4 GAS CONNECTION.
Our water heaters are designed to operate with
methane gas (G20) and LPG. Supply pipes must
be the same as or larger than the 3/4”G water
heater tting. Before connecting the gas line,
carefully clean inside all the fuel feed system
pipes to remove any residue that could impair
water heater eciency. Also make sure the gas
corresponds to that for which the water heater
is prepared (see water heater data-plate). If
dierent, the water heater must be converted
for operation with the other type of gas (see
converting appliance for other gas types). It is
also important to check the dynamic pressure
of the mains (methane or LPG) used to supply
the water heater, which must comply with EN
437 and its attachment, as insucient levels may
reduce generator output and cause discomfort
to the user.
Ensure correct gas cock connection. e gas sup-
ply pipe must be suitably dimensioned according
to current regulations in order to guarantee cor-
rect gas ow rate to the burner even in conditions
of maximum generator output and to guarantee
appliance eciency (technical specications).
e coupling system must conform to standards
in force (EN 1775).
Fuel gas quality. e appliance was designed to
operate with combustible gas free of impurities;
otherwise it is advisable to fit special filters
upstream of the appliance to restore the purity
of the fuel.
Storage tanks (in case of supply from LPG
depot).
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance casing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the caloric value of
the mixture delivered to the appliance, with
subsequent change in its performance.
- The water heaters working with LPG and
supplied with cylinders equipped with shut
o and adjustment devices, must be connected
so as to guarantee the safety of people and of
the surrounding environment: comply with
regulatory requirements, and we recommend
installing appropriate lters to capture impu-
rities. If the appliance remains idle for a long
time, close the main gas supply cock, empty the
DHW circuit and disconnect power.
Attention: to empty the DHW circuit, always
close the domestic cold water inlet upstream of
the appliance. Open any domestic hot water tap
to discharge the pressure from the circuit.
1.5 HYDRAULIC CONNECTION.
Attention: before connecting the water heater and
so as not to make the warranty null and void on the
DHW heat exchanger, wash the system thoroughly
(piping, etc.) in a way to remove any residue that
could compromise the good functioning of the
water heater.
Water connections must be made in a rational way
using the couplings on the water heater template.
Attention: water hotter than 50°C causes severe
burns.
Always check the water temperature before any use.
1.6 ELECTRICAL CONNECTION.
e “Caesar Extra” water heater has an IPX5D
protection rating for the entire appliance. Elec-
trical safety of the appliance is reached only when
it is correctly connected to an ecient earthing
system as specied by current safety standards.
Attention: the manufacturer declines any
responsibility for damage or physical injury
caused by failure to connect the water heater to
an ecient earth system or failure to comply with
the technical reference standards.
Also ensure that the electrical installation
corresponds to maximum absorbed power
specifications as shown on the water heater
data-plate. Water heaters are supplied complete
with a “Y” type H 05 VVF 3 x 0,75 mm2power
cable without plug. If the power cable is damaged,
contact a qualied company (e.g. the Authorised
Aer-Sales Technical Assistance Service) for its
replacement to avoid a hazard.
e power cable must be laid as shown (Fig. 6).
If the network fuse on the connection terminal
block needs replacing, this must also be done by
qualied personnel: use a 3.15 A fast fuse. For
the main power supply to the appliance, never
use adapters, multiple sockets or extension leads.
N.B.: all water heater pipes must never be used
to earth the electric or telephone lines. Ensure
elimination of this risk before making the water
heater electrical connections.
Power cable

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INSTALLERUSER
MAINTENANCE TECHNICIAN
1.7 GAS SYSTEM COMMISSIONING.
To start up the system, refer to the technical
standards in force.
In particular, for new gas systems:
- avoid presence of sparks or naked ames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to the specications set forth by
technical regulations in force.
1.8 WATER HEATER START UP
IGNITION.
Attention: before commissioning the water
heater, if it is operated with LPG, make sure
parameters 2 and 13 on page 15 have been
set correctly.
Attention: risk of burns. Hot ue gas exits the
front grid. Make sure no person or object is
damaged by ue gas (Fig. 7).
To commission the water heater (the operations
listed below must only be performed by qualied
personnel and in the presence of sta only):
- check that the internal system is properly sealed
according to the specications set forth by
regulations in force;
- ensure that the type of gas used corresponds to
water heater settings;
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
-check that there are no external factors that may
cause the formation of fuel pockets;
- switch the water heater on and ensure correct
ignition;
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative
intervention time;
- check activation of the main switch located
upstream of the water heater;
- check that the intake/ exhaust grids are not
blocked.
e water heater must not be started up even if
only one of the checks should be negative.
1.9 PROCEDURE FOR FIRST IGNITION,
PREPARATION TO USE THE
APPLIANCE.
Starting the appliance
Aer checking everything, proceed as follows:
- power the water heater;
- open the gas cock installed upstream from the
water heater;
- open the water tap in the lower part of the water
heater;
Press the ignition button ( ). The screen
displays:
• e soware revision.
• e type of gas set up on the water heater (ng:
G20 - Lg: LPG).
• Appliance power in l/min.
• Test symbols (display all on).
Aer the procedure, before ignition, the screen
displays the symbols ( ) (Fig. 8).
Press the button ( ) to start the water heater.
e screen displays the value of the set temper-
ature, the symbol ( ) (in the event of hot water
ow rate in progress) and the symbol (in the
event of burner operation) ( ) (Fig. 9).
Regulation of the water temperature
e water temperature can be set within a range
of 37 and 60°C.
- Turn the ignition button clockwise to increase
the temperature and anticlockwise to decrease
it. e symbol ( ) ashes for 5 seconds and
the screen displays the new temperature set.
Attention: water hotter than 50°C causes severe
burns. Always check the water temperature be-
fore any use.
Appliance switch-o
- Press and hold the water heater switch-off
button ( ) for approximately 5 seconds;
- as soon as the symbols ( ) start ashing,
release the button;
- the appliance will go OFF and the screen will
display the xed symbols ( ) (Fig. 8).
From this point on, the appliance is inactive
(stand-by).
To restart the water heater again, press the igni-
tion button ( ).

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INSTALLERUSER
MAINTENANCE TECHNICIAN
1.10 WATER HEATER COMPONENTS.
Key:
A - Anti-freeze resistances
1 - Gas valve
2 - Limit thermostat
3 - NTC probe (hot water outlet)
4 - Ignition/detection electrode
5 - Antifreeze thermostat
6 - Combustion air intake grid
7 - Fan
8 - Heat exchanger
9 - Burner
10 - NTC probe (cold water intake)
11 - Flow meter
12 - Cold water inlet
13 - Gas
14 - Hot water outlet

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INSTALLERUSER
MAINTENANCE TECHNICIAN
2 INSTRUCTIONS FOR USE AND MAINTENANCE
2.1 CLEANING AND MAINTENANCE.
e appliance must be serviced every year.
is ensures that the optimal safety, performance
and operating features that distinguish the appli-
ance remain unchanged over time.
2.2 GENERAL WARNINGS.
Never expose the wall-mounted water heater to
direct vapours from a cooking surface.
e device can be used by children at least 8
years old as well as by persons with reduced
physical, sensory or mental capabilities, or lack of
experience or required knowledge, provided that
they are under surveillance, or aer they have
been instructed relating to the safe use and have
understood the potential dangers. Children must
not play with the appliance. Cleaning and main-
tenance destined to be performed by the user
can not be carried out by unsupervised children.
Do not touch the ue gas exhaust grid due to the
high temperatures it can reach.
For safety purposes, check that the air intake/ue
exhaust grids are not blocked, even temporarily.
Whenever temporary deactivation of the water
heater is decided, the electric, water and gas
supplies must be interrupted.
N.B.: the water heater must remain powered
to guarantee operation of the antifreeze device
supplied as per standard. e antifreeze protec-
tion is active even with the appliance in standby.
In the case of work or maintenance to structures
located in the vicinity of ducting or devices for ue
extraction and relative accessories, switch o the
appliance and on completion of operations ensure
that a qualied technician checks eciency of the
ducting or other devices.
Never clean the appliance or connected parts
with easily ammable substances.
Never leave containers or ammable substances
in the same environment as the appliance.
- If there is a water leak, immediately close the
mains water supply and ask an authorised com-
pany for assistance (for example, Authorised
Aer-sales Service).
• Attention: using any components that use
electrical power requires some fundamental
rules to be observed:
- do not touch the appliance with wet or moist
parts of the body; do not touch it when bare-
foot;
- never pull electrical cables or leave the ap-
pliance exposed to atmospheric agents (rain,
sunlight, etc.);
- the appliance power cable must not be replaced
by the user;
- in the event of damage to the cable, switch o
the appliance and contact exclusively qualied
sta for replacement;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.
N.B.: the water heater must remain powered
to guarantee operation of the antifreeze device
supplied as per standard. e antifreeze protec-
tion is active even with the appliance in standby.
At the end of its service life, the appliance must
not be disposed of like normal household waste
nor abandoned in the environment, but must
be removed by a professionally authorised
company. Contact the manufacturer for disposal
instructions.
2.3 QUICK APPLIANCE OPERATION
GUIDE.
Ignition
Press the ignition button ( ).
Regulation of the water temperature
Turn the regulation knob to the right to increase
the temperature and to the le to decrease it
(temperature ranging between 37 and 60°C).
Switching o
Press and hold the switch-o button ( ). As
soon as the symbols ( ) start ashing, release
the button.
e appliance will go OFF and the screen will
display the xed symbols ( ).
Reset
Press and hold the reset button ( ). As soon as
the wording ( ) is displayed, release the button.
e appliance is ready for use.
Attention: if the appliance is switched o for long
periods, disconnect the external omnipolar water
heater switch and close the gas cock upstream of
the water heater.
Attention: if it is likely that the ambient temper-
ature where the water heater is installed can drop
below 0° C, the water inside the water heater must
be emptied by closing the cold water inlet cock and
opening the hot water cock below the environment’s
main water supply.
Ignition - switch-o - reset button/Water
temperature adjustment knob

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INSTALLERUSER
MAINTENANCE TECHNICIAN
2.4 CONTROL PANEL.
Key:
1 - Display
2 - On - O - RESET button/
Water adjustment knob
3 - Water ow rate in progress
4 - Value of the set temperature
Faults/Alarms
5 - Remote control connection (accessory)
6 - Solar system connection
7 - Presence of faults
8 - Presence of ame (ame symbol)
Flame fault (crossed-out symbol)
2.5 FAULTS AND SCREEN DISPLAYS.
If the appliance blocks, the display reads ( )
(Fig. 13) followed by a fault code which must be
referred to in order to unblock it.
Two types of stops can occur:
• Temporary stop (not permanent), the fault code
ashes, the stop is automatically removed when
its cause has been solved. If the fault persists, the
temporary stop switches to permanent.
Display Type of alarm Solutions
Denite shutdown
Flame control module block alarm.
Electronic ame control fault alarm.
Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).
Denite shutdown
Limit thermostat alarm. Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).
Denite shutdown
IN-OUT DHW NTC fault alarm. (1)
Temporary stop
Parasite ame alarm. (1)
Denite shutdown
Modulation coil cable disconnection alarm. Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).
Denite shutdown
Alarm in the event of 5 consecutive resets.
To reset the appliance, disconnect and connect it again.
Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).
Temporary stop
Low Voltage alarm. Wait for the water heater to auto reset (1).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical Aer-Sales Service)
• Denite stop (block), the fault code ashes. In
this case, the appliance does not restart auto-
matically and must be released by the user or
operator by way of the release procedure only.
Below is a list of the types of alarms, their type of
display and the solutions to reset the appliance:

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INSTALLERUSER
MAINTENANCE TECHNICIAN
Display Type of alarm Solutions
Temporary stop
Incorrect network frequency detection alarm. Wait for the water heater to auto reset (1).
Denite shutdown
Flame loss alarm for more than 3 consecutive times. (1)
Temporary stop
Button fault It is displayed when the button is held for over 30 seconds; once
released, the fault disappears.
Denite shutdown
Remote control panel communication fault (accessory). (1)
Denite shutdown
Valve calibration request. (1)
Temporary stop
AL70 - Inlet temperature alarm >70°C
Displayed with a ashing bell only
Complete view is only displayed in the alarms log
(1)
Denite shutdown
Alarm regarding increased temperature not reached. (1)
Denite shutdown
Driver error alarm. (1)
Denite shutdown
Alarm caused by a problem with combustion during ignition.
Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).
Denite shutdown
Block caused by persistent bad combustion (1)
Temporary stop
Bad combustion alarm (1)
Temporary stop
AL84 - Bad combustion alarm
Displayed with a ashing ame only
Complete view is only displayed in the alarms log
(1)
Denite shutdown
Fan revs sensor alarm (1)
Display
High temperatures (1)
Denite shutdown
Soware, startup board error alarm (1)
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical Aer-Sales Service)
2.6 EMPTYING THE WATER HEATER.
To empty the water heater, close the cold water
inlet valve and open the hot water valve lower
down in the water network in the environment.
2.7 ANTIFREEZE PROTECTION.
e water heater is supplied with an antifreeze
device supplied as per standard to keep it from
freezing at temperatures as low as -15°C. It is
triggered when the temperature reaches 5°C and
switches o when it reaches 15°C.
2.8 CLEANING THE CASE.
Use damp cloths and neutral detergent to clean
the water heater casing. Never use abrasive or
powder detergents.
2.9 DECOMMISSIONING.
In the event of permanent shutdown of the water
heater, contact professional sta for the proce-
dures and ensure that the electrical, water and
gas supply lines are shut o and disconnected.
2.10 TEMPORARY DEACTIVATION.
When the product is not used for long periods
of time, to avoid any type of risk, the user must
close the main gas cock and empty the DHW
circuit (Ref. Par. 1.4 e 2.6) and disconnect the
electric power supply.
2.11 GAS SYSTEM NOT USED FOR
PERIODS OVER 12 MONTHS.
e current regulation provides that gas systems
not used for over 12 months must be checked
prior to being used again, as per regulations in
force, by professionally qualied sta.
If the inspection is successful, the water heater
can be recommissioned according to the instruc-
tions specied in Paragraph 1.8 herein.

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14
4
3
2
1
5
6
8
7
9
AC AF
G
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INSTALLERUSER
MAINTENANCE TECHNICIAN
3 CHECK AND MAINTENANCE
Key:
1 - Gas valve
2 - Limit thermostat
3 - NTC probe (hot water outlet)
4 - Fan
5 - Domestic hot water heat exchanger
6 - NTC probe (cold water intake)
7 - Burner
8 - Flow regulator
9 - Flow meter
10 - Antifreeze thermostat
AC - Domestic hot water outlet
AF - Domestic cold water inlet
G - Gas supply
3.1 HYDRAULIC DIAGRAM.

14
15
16
17
P P G G R W BK
BL
BL
BL
BR
BR
BR
BK BK BR BR BR BU GR PK Y BL P
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.2 WIRING DIAGRAM.
Key:
EL - Ignition electrode
TR - Ignition transformer
F - Fan
FX - DHW ow meter
LT - Limit thermostat
SP - DHW probe (hot water output)
SI - DHW probe (cold water input)
GV - Gas valve
AFT - Anti-freeze resistances thermostat
AFR - Anti-freeze resistances
CR - Remote control
3.3 SERVICE MENU.
“Service Menu” activation
It is possible to access the “SERVICE MENU”
in order to edit the operating parameters of the
appliance.
- With the water heater on, press the reset button
() (Fig. 16) for approximately 10 seconds. e
symbols on the display will start ashing and
rst ( ) will be displayed, followed by ( );
- release the reset button;
- enter the code ( ) by turning the knob and
conrm by pressing reset.
If the code is wrong, or if the time envisaged
for the operation should drop, the appliance
automatically goes back to the standby or op-
eration status.
Upon accessing the “SERVICE MENU”, it is
possible to select the sub-menu concerned by
turning the knob:
• ( ) Parameters menu.
• ( ) Calibration menu.
• ( ) Alarms log menu.
• ( ) Info menu.
Once you have found the sub-menu you are
looking for, conrm by pressing reset ( ).
Attention: to exit from the “SERVICE MENU”,
press the reset button until the wording MENU
ashes, then release the button: the display goes
to the last sub-menu selected. Press the reset but-
ton again until the wording MENU ashes, then
release the button: the screen displays the value of
the set temperature.
Parameters menu ( )
On activating the menu, the index of the rst
parameter is displayed, followed by the set value:
- turn the knob to display the following param-
eters;
- having identied the parameter to edit, press
reset: the value that can be edited ashes and,
by turning the knob, it is possible to change it;
- save the value by pressing the reset button.
Attention: the menu is exited automatically aer
5 minutes of inactivity, or by pressing the reset
button for a while.
Below is a list of parameters that can be edited.
Colour code key:
BK - Black
BL - Blue
BR - Brown
G - Green
GY - Grey
R - Red
W - White
Y - Yellow
P - Purple
PK - Pink
BU - Light blue

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INSTALLERUSER
MAINTENANCE TECHNICIAN
N°
parameter Description Range Default value
02
Gas type
0 = methane
1 = LPG
0-1 0
08
DHW mode o
0 = xed
1 = linked to the DHW setpoint
0-1 0
09 Ignition power 0...40 40
13
LPG gas type
1 = propane
2 = butane
1-2 1
17 Complete or partial calibration 0...100 0
18
DHW modulation with ow meter
0 = modulation without ow meter
1 = modulation with ow meter
0-1 1
26
Type of water heater
0 = not applicable to this model
1 = not applicable to this model
2 = Caesar Extra 11
3 = Caesar Extra 14
0...3 depending on the model
28 0 = standard water heater installer
1 = water heater connected to a solar system 0-1 0
Attention: any other additional parameters with regard to the previous table must not be changed for any reason.
Calibration menu ( )
Attention: the pressure must only be adjusted by
an authorised technician.
Attention: the operations described below must
be carried out in sequence.
Attention: calibration is completed automatically
aer 15 minutes of inactivity or by pressing reset for
a long time, or in the event of overheating (67°C).
Before calibration, check the network pressure
by referring to the previous paragraph.
To calibrate the gas valve, (standard procedure
MANU: it will be possible to deviate from the
value set by approximately +/- 1.5 mbar) follow
the operations below:
- set the system’s electric switch O;
- remove the casing by loosening the fastening
screws situated in the lower part of the water
heater and release the casing from the upper
part;
- remove the cap that closes the service passage
(situated on the bracket - Fig. 26) and make it
pass through the hole of the silicone pipe of the
pressure gauge;
- loosen the pressure point screw downstream of
the gas valve by approximately two turns and
connect a pressure gauge;
- close the casing properly and set the system’s
switch On;
- access the calibration menu ( );
- open the hot water tap and wait for the burner
to ignite.
On activation of the menu, the wording Ma
will appear rst, followed by nu that makes up
the word Manu and ( ) to indicate that the
appliance is operating at its maximum.
- Turn the knob until the burner’s maximum
pressure value is displayed on the pressure
gauge (ref. technical data table);
- to save the value, press the reset button;
- press the reset button to select the next value
regarding minimum calibration ( );
- turn the knob until the burner’s minimum
pressure value is displayed on the pressure
gauge (ref. technical data table);
- to save the value, press the reset button;
- press the reset button until the word MENU
ashes, then release the button: the screen will
display ( );
- press the reset button again until the wording
MENU ashes, then release the button: the
screen displays the value of the set temperature;
- close the hot water cock.
Attention: the menu is exited automatically
aer 15 minutes of inactivity, or in the event of
overheating 67°C).
Alarms log menu ( )
is function enables you to view the last 10
errors triggered on the appliance.
On activating the menu, the following is dis-
played alternately: the wording ( ) (index of
the last error memorised), the error code and
wording ( ) (e.g.: ( ) => ( ) => ( ) ).
Turn the knob to scroll through the index of
errors; the displays run from the most recent to
the furthest in time.
If the user pauses, the screen displays the word-
ing AL to indicate that they are in the errors
log menu.
Press the reset button until the wording MENU
ashes, then release the button, the screen dis-
plays ( ).
Attention: to exit the menu, press the reset but-
ton again until the wording MENU ashes, then
release the button: the screen displays the value of
the set temperature.
Info menu ( )
is function displays:
the soware revision.
e water temperature in real time.
e water ow rate in real time (l/min).
is function remains active when supplying
hot water.
Attention: the menu is exited automatically
aer 15 minutes of inactivity, or by pressing the
reset button.

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21
B
A
Fig. 18 d
22
23
24
25
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.4 POSSIBLE PROBLEMS AND THEIR
CAUSES.
N.B.: maintenance operations must be carried
out by an authorised company (e.g. Authorised
Aer-Sales Technical Assistance Service).
Refer to paragraph 2.5 for information regarding
faults and display signals.
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check tightness of gas intake circuit.
- Irregular combustion (red or yellow ame).
is can be caused by: burner dirty or lamellar
pack obstructed. Clean the above components
and ensure correct installation of the terminal.
- Frequent trips of the overheating temperature
or safety thermostat. It can depend on an
anomaly on the water heater P.C.B. or and
anomaly of the regulation NTC probe.
- Poor water flow: if, as a result of limescale
(calcium and magnesium), the domestic hot
water system does not work properly contact an
authorised company for descaling e.g. Authorised
Technical Assistance Service according to good
practice. To preserve integrity and eciency of
the heat exchanger, a non corrosive descaler must
be used. Cleaning must be carried out without the
use of tools which can damage the heat exchanger.
3.5 CONVERTING THE WATER HEATER
TO OTHER TYPES OF GAS.
e operation of appliance transformation from
a gas family to another can be easily carried out
even if the appliance is installed.
Instructions regarding the transformation and
adjustment of various types of gas are described
below.
Attention: please note that transformation op-
erations must be carried out by authorised and
qualied sta, in compliance with the technical
regulations in force.
Switch o the device from the omnipolar switch
provided on the power supply line and close the
gas and water cocks.
- Remove the casing by referring to the specic
chapter;
- remove the wire spring placed on the cold water
pipe (Part. A Fig. 21);
- disconnect the gas pipe and remove it (Part.
BFig. 21):
- loosen the three screws shown in Fig. 22 and
lower the intermediate metal-sheet plate (Fig.
23);
- loosen the side fastening screws of the mani-
fold, remove the side brackets and extract the
gas manifold (Fig. 24);
- replace the manifold;
Attention: the manifold is already equipped
with injectors, it is therefore not necessary to
replace them.
- reassemble the components proceeding in
reverse order;
- if there are seals, they must be restored.
Parameter change 02 (type of gas)
Start the appliance and access the Parameters
menu ( ), as follows:
- with the water heater on, press the reset button
() for approximately 10 seconds. e sym-
bols on the display will start ashing and rst
( ) will be displayed, followed by ( );
- release the reset button;
- enter the code ( ) by turning the knob and
conrm by pressing reset;
- turn the knob to select ( ) (Parameters menu)
and conrm by pressing reset;
- on accessing the Menu, scroll through the list
with the knob until nding parameter 02 (gas
type), and press reset: the value that can be
reset will ash and it will be possible to select
the type of gas required by turning the knob:
0 (MTN) - 1 (LPG);
- if LPG gas is selected, propane gas is selected by
default. If you require butane gas, set parameter
13 to 2;
- save by pressing the reset button.
Aer the procedure, the appliance displays alarm
AL62, which indicates that you must calibrate
the gas valve.
Attention: the menu is exited automatically aer
5 minutes of inactivity, or by pressing the reset
button for a while.
Gas valve calibration
e gas valve must ONLY be calibrated by the
Authorised Aer-Sales Service.
For the procedure, refer to the instructions sheet
in the gas exchange kit.

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INSTALLERUSER
MAINTENANCE TECHNICIAN
3.6 CHECK THE NETWORK
PRESSURE MINIMUM POWER
SUPPLY PRESSURE  ONLY WITH
APPLIANCES OPERATING WITH
METHANE.
- Disconnect power from the water heater;
- remove the casing by loosening the fastening
screwssituatedin thelowerpart ofthewaterheater
and release the casing from the upper part;
- remove the cap that closes the service passage
(situated on the bracket - Fig. 26) and make it pass
throughthe holeof thesiliconepipe of thepressure
gauge;
- loosen the pressure point screw upstream of the
gas valve (Fig. 26) by approximately two turns and
connect the pressure gauge;
- close the casing properly;
- turn the water temperature adjustment knob to
maximum;
- connect power to the water heater;
- open a hot water tap to the maximum ow rate.
Check the gas pressure by referring to the values
indicated in the data table. If the pressure is above 15
mbar, proceed with calibrating the gas valve. When
measuring, a tolerance of +/- 0.5 mbar is permitted.
- Close the hot water cock;
- disconnect the pressure gauge and secure the pres-
sure point screw upstream of the gas valve again;
- if there are seals, they must be restored.
3.7 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the ue hood for deterioration
or corrosion.
- Check correct lighting and functioning.
- Check correct burner calibration.
- Check correct operation of control and
adjustment devices of the appliance. and in
particular:
- the intervention of the functioning selector
positioned on the water heater control panel;
- domestic hot water control thermostat inter-
vention.
- Check that the internal gas system is properly
sealed according to the specications set forth
by technical regulations in force.
- Check the intervention of the device against no
gas ionisation ame control. Intervention time
must be less than 10 seconds.
- Check for water leaks or oxidation from/on the
ttings.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- Check the condition and integrity of the elec-
trical system and in particular:
- the power cables must be inside the cable
xings;
- there must be no traces of blackening or
burning.

18
27
2
1
a
a
b
1
c
c
3
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.8 CASING REMOVAL.
To facilitate water heater maintenance, the casing
can be completely removed by following these
simple instructions (Fig. 27):
1) loosen the lower screws (a) that secure the
casing (b).
2) Pull the casing towards you (b) in the lower
side.
3) Push the casing (b) upwards in a way to be
able to extract it from the upper hooks (c).

19
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.9 COMBUSTION PARAMETERS.
3.10 TECHNICAL DATA.
G20 G30 G31
Supply pressure mbar 20 28-30 37
Caesar Extra 11
Diameter of the main burner nozzle (No. of nozzles) (*) mm 0.86 (18) - 0.83 (4) 0.50 (18) - 0.48 (4) 0.50 (18) - 0.48 (4)
Nozzles (*) N. 22 22 22
P.C.I. (15° C 1013 mbar) MJ/m334.02 116.09 88.00
WI (15° C 1013 mbar) MJ/m345.67 80.58 70.69
Consumption m3/h 2.28 - -
kg/h - 1.70 1.67
Max./min. burner pressure mbar 11.50 - 2.50 28.30 - 6.10 36.50 - 7.90
Flue temperature at min./max. output °C 115 - 186 113 - 185 110 - 180
Emissions of nitrogen oxides (NOx) mg/kWh 43.80 53.90 34.50
Caesar Extra 14
Diameter of the main burner nozzle (No. of nozzles) (*) mm 0.86 (24) - 0.83 (4) 0.50 (24) - 0.48 (4) 0.50 (24) - 0.48 (4)
Nozzles (*) N. 28 28 28
P.C.I. (15° C 1013 mbar) MJ/m334.02 116.09 88.00
WI (15° C 1013 mbar) MJ/m345.67 80.58 70.69
Consumption m3/h 2.86 - -
kg/h - 2.13 2.10
Max./min. burner pressure mbar 12.40 - 2.00 28.20 - 4.40 36.00 - 5.60
Flue temperature at min./max. output °C 90 - 177 95 - 177 91 - 174
Emissions of nitrogen oxides (NOx) mg/kWh 29.40 45.00 20.90
(*): it is strictly forbidden to replace the nozzles individually. If necessary, replace the entire manifold.
Caesar Extra 11 Caesar Extra 14
Nominal heat input (Qn) kW (kcal/h) 21.5 (18490) 27.0 (23220)
Minimum heat input (Qm) kW (kcal/h) 9.5 (8170) 10.0 (8600)
Nominal heat output (useful) (Pn) kW (kcal/h) 19.3 (16604) 24.3 (20921)
Minimum heat output (useful) (Pm) kW (kcal/h) 8.6 (7353) 9.0 (7706)
Domestic hot water ow limiter l/min 8 10
Flow rate capacity in continuous duty (∆T 35°C) l/min 8 10
Minimum water ow rate ignition l/min 2 2
Domestic hot water adjustable temperature °C 37 - 60 37 - 60
Minimum water pressure bar 0.13 0.13
Maximum water pressure bar 10 10
Water heater weight kg 14 15
Minimum working temperature °C -15 -15
Electrical connection V/Hz 230/50 230/50
Installed electric power W 41 59
Installed electric power with antifreeze device operating W 80 80
Equipment electrical system protection - IPX5D IPX5D
Type of appliance A2
Category II2R3R
- e data relevant to domestic hot water per-
formance refer to a dynamic inlet pressure of 2
bar and an inlet temperature of 15°C; the values
are measured directly at the water heater outlet
considering that to obtain the data declared
mixing with cold water is necessary.

20
2017 812/2013
2017 812/2013
Caesar Extra 11 Caesar Extra 14
XL
CAESAR EXTRA 14
A
50 dB
20 17
kWh/annum GJ/annum
M
CAESAR EXTRA 11
A
51 dB
18 6
kWh/annum GJ/annum
3.11 PRODUCT FICHE IN COMPLIANCE WITH REGULATION 812/2013.
Parameter value
Annual electricity consumption for the
domestic hot water function (AEC) 18 kWh
Annual fuel consumption for the domestic
hot water function (AFC) 6 GJ
Water heating energy eciency ( ηwh) 70 %
Parameter value
Annual electricity consumption for the
domestic hot water function (AEC) 20 kWh
Annual fuel consumption for the domestic
hot water function (AFC) 17 GJ
Water heating energy eciency ( ηwh) 86 %
For proper installation of the appliance refer
to Chapter 1 of this booklet (for the installer)
and current installation regulations. For proper
maintenance, refer to Chapter 3 of this booklet
(for the maintenance technician) and adhere
to the frequencies and methods set out herein.