Immergas CAESAR ECO 17 Instructions And Warnings

Instructions and warnings

Installer

User

Maintenance technician

IE

CAESAR ECO 17

Wall-hung instantaneous

water heaters

with sealed chamber (type C) and

fan assisted

or

open chamber (type B) and

fan assisted

*1.043165ENG*

*1.043165ENG*

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 scheduled maintenance contact Authorised Aer-Sales 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 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.

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.

INDEX

USER page INSTALLER page MAINTENANCE TECHNICIAN page

1 Water heater installation .........................5

1.1 Installation recommendations. .............. 5

1.2 Main dimensions. ....................................6

1.3 Antifreeze protection. .............................6

1.4 Gas connection. ....................................... 6

1.5 Hydraulic connection..............................7

1.6 Electrical connection. ............................. 7

1.7 Immergas ue systems. ...........................8

1.8 Tables of Resistance Factors and

Equivalent Lengths. .................................9

1.9 Concentric horizontal kit installation. 10

1.10 Concentric vertical kit installation. .....10

1.11 Separator kit installation. ......................11

1.12 Ducting of ues or technical slots. ......12

1.13 Installation of boiler type B with open
chamber and fan assisted (optional). .. 12

1.14 Flue exhaust to ue/chimney. .............. 12

1.15 Flues, chimneys and chimney pots. ....12

1.16 Gas system start-up. ..............................12

1.17 Water heater start up (ignition). ..........12

1.18 Procedure for rst ignition,

preparation to use the appliance. ......... 13

1.19 Kits available on request. ...................... 13

1.20 Water heater components. .................... 14

2 Instructions for use and maintenance 15

2.1 Cleaning and maintenance. ..................15

2.2 General warnings. .................................. 15

2.3 Quick appliance operation guide. ........15

2.4 Control panel. ........................................16

2.5 Faults and screen displays.....................16

2.6 Emptying the water heater. ................... 17

2.7 Anti-freeze protection (optional). .......17

2.8 Cleaning the case. .................................. 17

2.9 Decommissioning. .................................17

2.10 Gas system not used for periods

over 12 months. .....................................17

3 Check and maintenance .......................18

3.1 Hydraulic diagram. ................................18

3.2 Wiring diagram. .....................................19

3.3 Service Menu. .........................................20

3.4 Possible problems and their causes. ....22

3.5 Converting the water heater

to other types of gas...............................22

3.6 Solar panels coupling function. ...........23

3.7 Check the network pressure
(minimum power supply pressure -
only with appliances operating

with methane). .......................................24

3.8 Yearly appliance check

and maintenance. ...................................24

3.9 Casing removal. .....................................25

3.10 Combustion parameters. ......................26

3.11 Technical data. .......................................26

3.12 Product che (in compliance

with Regulation 812/2013). ..................27

3.13 Parameters for lling

in the package che. ..............................28

5 cm 5 cm

WATER HEATER

1

INSTALLATION

1.1 INSTALLATION
RECOMMENDATIONS.

e water heater has 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 al­low 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 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).
By varying the type of installation the classi­cation of the water heater also varies, precisely:

- Type B water heater22 if installed using the

relevant terminal for air intake directly from
the room in which the water heater has been
installed.

- Type C water heater if installed using concen-

tric pipes or other types of pipes envisioned for
the sealed chamber water heaters for intake of
air and expulsion of fumes.

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 21 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 sys­tems 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 installed inside or between cabinets,
ensure sufficient space for normal servicing;
therefore, leave clearance of at least 5 cm between
the water heater casing and the vertical sides of
the cabinet. Leave adequate space above and
below the water heater for possible water and
ue removal connections (Ref. Fig. 2).

Keep all ammable objects away from the ap­pliance (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 Tech­nical 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 and built for
installation inside buildings.

- Installation of gas appliances, ue exhaust
pipes and combustion air intake pipes is
forbidden in places with a re risk (for ex­ample: garages, closed parking stalls), and
in potentially dangerous places.

- Installation on the vertical projection of
cooking hobs is forbidden.

- Installation is forbidden in places/rooms
that constitute public areas of apartment
buildings, internal stairways or other escape
routes (e.g. oor landings, entrance halls,
etc.).

- Installation is also forbidden in places/rooms
that constitute public areas of apartment
buildings such as cellars, entrance halls, attics,
los, etc., unless otherwise provided for by
local regulations in force.

- It is forbidden to install the water heater
inside a closed recessed frame (e.g. Omni
Container).

- e appliance was designed to be installed in
indoor and protected places.

- It must also be installed in an environment
in which the temperature cannot fall below
0°C. It must not be exposed to atmospheric
agents.

If the water heater is installed in a place whose
temperature drops below 0°C, it is compulsory
to use the antifreeze accessory that provides for
adequate protection down to -15°C.

YES

- It is prohibited to obstruct the air intake
and aeration grids where the appliance is
installed.

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
(according to technical standards) in walls made
of solid or semi-hollow brick or block. In the
case of walls made from hollow brick or block,
partitions with limited static properties, or in any
case walls other than those indicated, a static test
must be carried out to ensure adequate mount.

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.

NO

1

INSTALLERUSER

MAINTENANCE TECHNICIAN

20 cm

2

5

1.2 MAIN DIMENSIONS.

Caesar Eco 17

INSTALLERUSER

A

A/S

A A/S

CONNECTIONS

GAS DOMESTIC HOT WATER

G AC AF

3/4” 1/2” 1/2”

Key:

A

A/S

AC - Domestic hot water outlet
AF - Domestic hot water inlet
G - Gas supply
V - Electrical connection
A - Intake
S - Exhaust
A/S - Intake/Exhaust

3

1.3 ANTIFREEZE PROTECTION.
Minimum temperature. If the water heater

is installed in a place where the temperature
falls below 0°C, the connection pipes must be
insulated and, in the event there is no gas (or
the water heater goes into no ignition block), the
appliance can freeze.

To prevent the risk of freezing follow the instruc­tions below:

- Protect the domestic hot water circuit against
freezing by using an accessory that is supplied
on request (anti-freeze kit) comprising two
electric heating elements, the relevant cables
and a control thermostat (carefully read and

MAINTENANCE TECHNICIAN

follow the installation instructions contained
in the accessory kit pack).

Water heater anti-freeze protection is thus ensured
only if:

- the water heater is correctly connected to elec­tricity power supply circuits;

- the main switch is on;

- the antifreeze kit is installed correctly;

- the connection pipes are insulated.

In these conditions the water heater is protected
against freezing to temperature of -15°C.

e warranty does not cover damage due to inter­ruption of the electrical power supply and failure
to comply with that stated on the previous page.

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
supply pipe must be suitably dimensioned
according to current regulations in order to
guarantee correct 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.

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.

6

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: to preserve the duration and features
of appliance eciency, in the presence of water
whose features can lead to the deposit of lime
scale, it is necessary to install the “polyphosphate
dispenser” kit.

1.6 ELECTRICAL CONNECTION.

e “Caesar Eco” water heater has an IPX5D pro­tection rating for the entire appliance. Electrical
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 speci­cations as shown on the water heater data-plate.
Water heaters are supplied complete with an
“X” type power cable without plug. e power
cable must be connected to a 230V ±10% / 50Hz
mains, respecting L-N polarity and the earthing
connection ; this network must have a mul­ti-pole circuit breaker with Class III overvoltage
category. If the power supply cable is damaged, it
must be replaced by a special cable or assembly,
which are only available from the manufacturer
or its Aer-sales Service. It is recommended to
contact a qualied company (e.g. the Authorised
After-Sales Technical Assistance Service) for
replacement to avoid a hazard. e power cable
must be laid as shown (Fig. 4).

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.

INSTALLERUSER

Power cable

4

MAINTENANCE TECHNICIAN

7

1.7 IMMERGAS FLUE SYSTEMS.

1

1

14

0 2 4 6 8 10 12 14 16 18 20 22 24

Immergas supplies various solutions separately
from the water heaters regarding the installation of
air intake terminals and ue extraction, which are
fundamental for water heater operation.

Attention: e water heater must only be installed
together with an original Immergas air intake and
ue gas exhaust system, in compliance with the
standards in force. is system can be identied
by an identication mark and special distinctive
marking bearing the note "not for condensing
boilers".

INSTALLERUSER

e ue exhaust pipes must not be in contact with
or be near to ammable materials. Moreover, they
must not pass through buildings or walls made of
ammable material.

• Positioning of double lip seals. For correct posi-

tioning of lip seals on elbows and extensions, follow
the assembly direction (Fig. 5).

• Coupling extension pipes and concentric
elbows. To install snap-fit extensions with
other elements of the ue extraction elements
assembly, follows:

Fit the concentric pipe or elbow with the male

side (smooth) on the female section (with lip
seal) to the end stop on the previously installed
element. is will ensure sealing and joining of
the elements correctly.

Attention: if the exhaust terminal and/or

concentric extension pipe needs shortening,
consider that the internal duct must always
protrude by 5 mm with respect to the external
duct.

• N.B.: for safety purposes, do not obstruct the

water heater intake-exhaust terminal, even
temporarily.

• N.B.: when installing horizontal pipes, a min-

imum inclination towards the water either of
3% must be maintained and a section clamp
with plug must be installed every 3 metres.

• Diaphragm installation. For proper water

heater operation, a diaphragm must be installed
on the outlet of the sealed chamber and before
the exhaust pipe (Fig. 6).

N.B.: the diaphragm is supplied as per standard

with the water heater.

e head loss of the
90° bend coming
out from the appli­ance must NOT be
calculated

Duct length/metres

Maximum completed length

5

6

7

duct length [m]

type of exhaust

B22

Type C

d.60/100

horizontal

Type C

d.60/100

vertical

Type C
d.80/80

MAINTENANCE TECHNICIAN

Attention: if installation requires signicant ue exhaust sections, it is necessary to consider the formation of condensate and thus use the “blue series”
insulated type of ue.

excluding the 90°

outlet bend from the

appliance.
Ref. g. 7

up to 4 46

from 8 to 12 none

up to 1 46

from 1.6 to 3.2 none

up to 2 46

from 2.6 to 4.2 none

3+3 46

from 3+3 to 6+6 48

from 6+6 to 9+9 none

ue gas

diaphragm

[d. mm]

head loss of

every additional

bend

45° 90°

1.3 m 1.8 mfrom 4 to 8 48

1 m 1.4 mfrom 1 to 1.6 48

1 m 1.4 mfrom 2 to 2.6 48

1.3 m 1.8 m

without diaphragm - with a 48 diam. diaphragm - with a 46 diam. diaphragm

With separate ducts having dierent lengths

2

0

8

6

4

Length of ue exhaust pipe (m)

2

0

Air intake pipe length (m)

Caesar Eco 17

8

1.8 TABLES OF RESISTANCE FACTORS

AND EQUIVALENT LENGTHS.

TYPE OF DUCT

Concentric pipe Ø 60/100 m 1

Terminal complete with intake-exhaust
horizontal concentric Ø 60/100

Intake-exhaust terminal
horizontal concentric Ø 60/100

Intake-exhaust terminal
vertical concentric Ø 60/100

Pipe Ø 80 m 1 (with and without insulation)

Complete intake terminal Ø 80 m 1
(with or without insulation)

Length

in m of concentric pipe

Ø 60/100

m 1

m 2.8

m 1.9

m 2.5

m 0.1 Intake m 1.0

m 0.2 Exhaust m 1.0

m 0.3 Intake m 2.2

Length

in metres

of pipe

Ø 80

Intake m 7.1

Exhaust m 5.5

Intake m 20

Exhaust m 15

Intake m 14

Exhaust m 10.6

Intake m 18

Exhaust 14

INSTALLERUSER

Intake terminal Ø 80
Exhaust terminal Ø 80

Split parallel Ø 80
from Ø 60/100 to Ø 80/80

m 0.2 Intake m 1.3

m 0.1 Exhaust m 0.8

Intake m 3.8

m 0.5

Exhaust m 2.9

MAINTENANCE TECHNICIAN

9

1.9 CONCENTRIC HORIZONTAL KIT

INSTALLATION.
Type C configuration, sealed chamber and
fan assisted.

Installation of this terminal is governed by cur­rent technical regulations.

is terminal is connected directly to the outside
of the building for air intake and ue exhaust. e
horizontal kit can be installed with the rear, right
side, le side or front outlet.

• External grid. e Ø 60/100 intake/exhaust

INSTALLERUSER

terminal, if properly installed, is pleasant to
look at on the outside of the building. Make
sure that the external silicone wall sealing plate
is properly inserted in the wall.

Horizontal intake-exhaust kit Ø 60/100. Kit
assembly (Fig. 8): install the bend with ange
(2) onto the central hole of the water heater
inserting the gasket (1) and tighten using the
screws included in the kit. Couple the concentric
terminal pipe Ø 60/100 (3) with the male end
(smooth) into the female end (with lip seals)
of the bend (2) up to the stop, making sure that
the internal and external wall sealing plate have
been tted, this will ensure sealing and joining
of the kit elements.

• Extensions for Ø 60/100 horizontal kit (Fig. 9).

e kit with this conguration can be extended
up to a max. horizontal length of 3.2 m includ-
ing the terminal with grid and excluding the
concentric bend leaving the water heater. In this
case the special extensions must be requested.

1.10 CONCENTRIC VERTICAL KIT
INSTALLATION.

Type C configuration, sealed chamber and
fan assisted.

Concentric vertical intake and exhaust kit. is
vertical terminal is connected directly to the out­side of the building for air intake and ue exhaust.

N.B.: the vertical kit with aluminium tile enables
installation on terraces and roofs with a maxi­mum slope of 45% (approx 25°) and the height
between the terminal cap and half-shell (374
mm) must always be respected.

Vertical kit with aluminium tile Ø 60/100.

To use this kit one must use the xing plate kit
60/100 (sold separately).
Kit assembly (Fig. 10): install the concentric
ange (2) on the central hole of the water heater
inserting the gasket (1) and tighten using the
screws in the kit. Fit the male end (smooth) of the
adapter (3) into the female end of the concentric
ange (2). Imitation aluminium tile installation.
Replace the tile with the aluminium sheet (5),
shaping it to ensure that rainwater runs off.
Position the xed half-shell (7) and insert the in­take-exhaust pipe (6). Fit the Ø 80/125 concentric
terminal pipe with the male end (6) (smooth) to
the female end of the adapter (3) (with lip gasket)
up to the stop; making sure that the wall sealing
plate (4) has been tted, this will ensure sealing
and joining of the elements making up the kit.

• Extensions for vertical kit Ø 60/100 (Fig. 11).

e kit with this conguration can be extend­ed to a max. straight vertical length of 4.2 m,
including the terminal. This configuration
corresponds to a resistance factor of 100. In
this case specic extensions must be requested.

2

1

3

e kit includes:
N° 1 - Gasket (1)
N° 1 - Concentric bend Ø 60/100 (2)
N° 1 - Int./exhaust concentric terminal Ø 60/100 (3)
N° 1 - Internal wall sealing plate (4)
N° 1 - External wall sealing plate (5)

MAINTENANCE TECHNICIAN

7

6

5

4

3

2

1

4

5

e xing plate kit includes:
N° 1 - Gasket (1)
N° 1 - Female concentric

ange (2)

e Kit includes:
N° 1 - Concentric intake-

exhaust pipe

Ø 60/100 (3)
N° 1 - Wall sealing plate (4)
N° 1 - Aluminium tile (5)
N° 1 - Fixed half-shell (6)
N° 1 - Mobile half-shell (7)

C

12

MAXIMUM EQUIVALENT LENGTH 3200

N.B.: to calculate the equivalent lengths, refer to the table on page 8.

8 9

C

32

Max. 45%

MAXIMUM EQUIVALENT LENGTH 4200

N.B.: to calculate the equivalent lengths,

refer to the table on page 8.

10

C

12

C

32

11

10

1

7

9

5

5

6

3

2

S

A

4

7

8

1.11 SEPARATOR KIT INSTALLATION.
Type C configuration, sealed chamber and
fan assisted.

is kit allows air to come in from outside the
building and the fumes to exit from the chim­ney or ue through divided ue exhaust and air
intake pipes. Combustion products are expelled
from pipe (S). e required amount of air is taken
in through pipe (A) for combustion. Both ducts
can be routed in any direction.

Separator kit Ø 80/80. Kit assembly (Fig. 12):
install the ange (4) on the central hole of the
water heater, interposing the gasket (1) and
tighten with the at-tipped hex screws included
in the kit. Remove the at ange present in the
lateral hole with respect to the central one (ac­cording to needs) and replace it with the ange
(3), positioning the gasket (2) already present on
the water heater and tighten using the supplied
self-threading screws.

Fit the male side (smooth) to the bends (5) in
the female side of the anges (3 and 4). Fit the
intake terminal (6) with the male side (smooth)
in the female side of the bend (5) up to the end
stop, ensuring that the internal and external wall
sealing plates are tted. Fit the exhaust pipe (9)
with the male end (smooth) in the female end of
the bend (5) up to the stop, making sure that the
internal wall sealing plate has been tted, this will
ensure sealing and joining of the kit elements.

• Installation clearances (Fig. 13). e minimum

installation clearance measurements of the Ø
80/80 separator terminal kit have been stated
in one limit condition.

• e gure (Fig. 14) shows the conguration

with vertical exhaust and horizontal intake.

• Extensions for separator kit Ø 80/80. The
maximum vertical rectilinear length (without
bends) used for Ø80 intake and exhaust pipes
can be calculated by using the graphs for ducts
with dierent lengths on page 8.

INSTALLERUSER

C

82

e kit includes:
N°1 - Exhaust gasket (1)

12

14

N°1 - Flange gasket (2)
N°1 - Female intake ange (3)

N°1 - Female exhaust ange (4)
N°2 - 90° bend Ø 80 (5)
N°1 - Intake terminal Ø 80 (6)
N°2 - Internal wall sealing plates (7)
N°1 - External wall sealing plate (8)

C

52

N°1 - Exhaust pipe Ø 80 (9)

C

13

C

42

82

MAINTENANCE TECHNICIAN

Max. 45%

Attention: if the installation requires a signicant
development of the ue to the discharge, due
consideration must be given to the formation of

L Ø80 A

To calculate the intake “L Ø80 A” and exhaust “L Ø80 S” distance, refer to the graph on page
8 regarding separate ducts having dierent lengths.

condensate that could take place inside the pipe
and Immergas insulated “Blue Series” ue kits
must be used.

L Ø80 S

11

15

1.12 DUCTING OF FLUES OR
TECHNICAL SLOTS.

With a specic “ducting system” it is possible to
reuse existing ues, chimneys and existing or
new technical slots to discharge the water heater
fumes. Ducting requires ducts declared to be
suitable for the purpose by the manufacturer,
following the installation and user instructions,
provided by the manufacturer and the require­ments of the regulations in force.

1.13 INSTALLATION OF BOILER TYPE B

INSTALLERUSER

WITH OPEN CHAMBER AND FAN
ASSISTED OPTIONAL.

This configuration requires use of a special
terminal (Ref. 1 Fig. 16) (present in the intake
kit for the installation in question) to be placed
on the intake hole above the sealed chamber
(Fig. 16). Air intake takes place directly from
the environment and ue exhaust in individual
chimney or to the outside.
With this conguration:

- air intake takes place directly from the envi-

ronment in which the appliance is installed
and only functions in permanently ventilated
rooms, according to the regulations in force;

- the ue exhaust must be connected to its own

individual flue or ducted directly into the
external atmosphere;

- type B open chamber boilers must not be

installed in places where commercial, artisan
or industrial activities take place, which use
products that may develop volatile vapours or
substances (e.g. acid vapours, glues, paints, sol­vents, combustibles, etc.), as well as dusts (e.g.
dust deriving from the working of wood, coal
nes, cement, etc.), which may be harmful for
the components of the appliance and jeopardise
operation.

- in conguration type B, the boilers must not be

installed in bedrooms, bathrooms or in bedsits.
The technical regulations in force must be
respected.

Max. length of exhaust pipe.

e exhaust pipe (both vertical or horizontal) can
be extended to the maximum length indicated in
the table on page 8.

1.14 FLUE EXHAUST TO FLUE/CHIMNEY.

e ue exhaust does not necessarily have to be
connected to a branched type traditional ue.
e ue exhaust, for water heaters installed in
C conguration, can be connected to a special
LAS type multiple ue. For B22 congurations,
exhaust is only allowed into individual chimney
or directly into the external atmosphere via a
relevant terminal. Multiple and combined ues
must be specially designed according to the
calculation method and requirements of the
standards (such as EN 13384), by professionally
qualied technical sta. Chimney or ue sections
for connection of the ue exhaust pipe must com­ply with requisites of technical standards in force.

1.15 FLUES, CHIMNEYS AND CHIMNEY
POTS.

e ues, chimneys and chimney caps for the
evacuation of combustion products must be
in compliance with the applicable standards
in force.

Positioning the exhaust terminals. e exhaust
terminals must:

- be installed on external perimeter walls of the

building;

- be positioned according to the minimum dis-

tances specied in current technical standards.

Combustion products exhaust of natural
draught or fan assisted appliances in open-top
closed environments. In spaces closed on all

sides with open tops (ventilation pits, court­yards etc.), direct combustion product exhaust
is allowed for natural draught or fan assisted gas
appliances with a heat input range from 4 to 35
kW, provided the conditions as per the current
technical standards are respected.

1.16 GAS SYSTEM STARTUP.

To start up the system, refer to the technical
standards in force. In particular, for new gas
systems:

- open windows and doors;

- 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.

1.17 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 21 have been set
correctly.

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 concentric intake-exhaust ter­minal (if tted) is not blocked.

e water heater must not be started up even if
only one of the checks should be negative.

MAINTENANCE TECHNICIAN

16

12

1.18 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 - Bu: G30 - Pr: G31).

• LE indicating that it is a Low Emission product.

• Model of the water heater: 7H (Caesar Eco 17).

Aer the procedure, before ignition, the screen
displays the symbols ( ) (Fig. 17).
Press the button ( ) to start the water heater.
e screen displays the value of the set temper­ature, the symbol ( ) (in the event of hot water
ow rate in progress) and the symbol (in the

event of burner operation) ( ) (Fig. 18).

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.

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. 17).

From this point on, the appliance is inactive
(stand-by).

To restart the water heater again, press the igni­tion button ( ).

1.19 KITS AVAILABLE ON REQUEST.

• Polyphosphate dispenser kit. e polyphos­phate dispenser reduces the formation of lime­scale and preserves the original heat exchange
and domestic hot water production conditions.
e water heater is prepared for application of
the polyphosphate dispenser kit.

• Anti freeze kit with resistance (on request). If
the water heater is installed in a place where the
temperature falls below 0°C and the appliance
can freeze. To prevent freezing of the domestic
hot water system, an anti freeze kit with an elec­trical resistance can be tted from the relative
cable and from a control thermostat.

e above-mentioned kits are supplied complete
with instructions for assembly and use.

INSTALLERUSER

17

18

13

MAINTENANCE TECHNICIAN

1.20 WATER HEATER COMPONENTS.

INSTALLERUSER

5

6

MAINTENANCE TECHNICIAN

7

4

3

2

8

1

9

12 11 10

Key:
1 - Gas valve
2 - Limit thermostat
3 - NTC probe (hot water outlet)
4 - Ignition/detection electrode
5 - Fan
6 - Heat exchanger

7 - Burner
8 - NTC probe (cold water intake)
9 - Flow meter
10 - Cold water inlet
11 - Gas
12 - Hot water outlet

19

14

INSTRUCTIONS FOR USE

2

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 appli­ance 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 main­tenance destined to be performed by the user
can not be carried out by unsupervised children.
Do not touch the ue gas exhaust terminal (if
present) due to the high temperatures it can
reach;
For safety purposes, check that the concentric
air intake/flue exhaust terminal (if fitted), is
not blocked.
Whenever temporary deactivation of the water
heater is decided, the electric, water and gas
supplies must be interrupted.

N.B.: you must leave the water heater powered
if the optional antifreeze kit is installed and the
room temperature can drop below 0°C.

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.

- It is prohibited to obstruct the air intake and
aeration grids where the appliance is installed.

- If there is a water leak, immediately close the
mains water supply and ask an authorised com­pany 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 bare­foot;

- never pull electrical cables or leave the ap­pliance 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.: you must leave the water heater powered
if the optional antifreeze kit is installed and the
room temperature can drop below 0°C.

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. C ontact 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 room temperature
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 room’s main
water supply.

INSTALLERUSER

Ignition - switch-o - reset button/Water
temperature adjustment knob

20

MAINTENANCE TECHNICIAN

15

2.4 CONTROL PANEL.

INSTALLERUSER

EXTMENU

MEM

Key:
1 - Display
2 - On - O - RESET button/
Water temperature adjustment knob
3 - Water ow rate in progress
4 - Value of the set temperature
Faults/Alarms

31

4 5

EXTMENU

MEM

78 62

5 - Remote control connection (accessory)
6 - Solar system connection
7 - Presence of faults
8 - Presence of ame (ame symbol)
Flame fault (crossed-out symbol)

21

2.5 FAULTS AND SCREEN
DISPLAYS.

If the appliance blocks, the screen displays the
wording ( ) followed by a fault code to refer
to in order to release 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

Flame control module block alarm.
Electronic ame control fault alarm.

Limit thermostat alarm.

IN-OUT DHW NTC fault alarm. (1)

Parasite ame alarm. (1)

Modulation coil cable disconnection alarm.

Alarm in the event of 5 consecutive resets.

MAINTENANCE TECHNICIAN

Denite shutdown

Denite shutdown

Temporary stop

Temporary stop

Denite shutdown

Denite shutdown

• Denite stop (block), the fault code ashes. In
this case, the appliance does not restart auto­matically 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:

22

Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).

Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).

Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).

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).

Low Voltage alarm. Wait for the water heater to auto reset (1).

Temporary stop

(1) If the shutdown or fault persists, contact an authorised company (e.g. Technical Aer-Sales Service)

16

Display Type of alarm Solutions

Incorrect network frequency detection alarm. Wait for the water heater to auto reset (1).

Temporary stop

Flame loss alarm for more than 3 consecutive times. (1)

Denite shutdown

Temporary stop

Denite shutdown

Denite shutdown

Temporary stop

Denite shutdown

Denite shutdown

Denite shutdown

Denite shutdown

Temporary stop

Temporary stop

Button fault

Remote control panel communication fault (only for exterior
model).

Valve calibration request. (1)

AL70 - Inlet temperature alarm >70°C
Displayed with a ashing bell only
Complete view is only displayed in the alarms log

Alarm regarding increased temperature not reached. (1)

Driver error alarm. (1)

Alarm caused by a problem with combustion during ignition.

Block caused by persistent bad combustion (1)

Bad combustion alarm (1)

AL84 - Bad combustion alarm
Displayed with a ashing ame only
Complete view is only displayed in the alarms log

It is displayed when the button is held for over 30 seconds; once
released, the fault disappears.

(1)

(1)

Press and hold the reset button ( ). As soon as the wording
( ) is displayed, release the button.
e appliance restarts automatically (1).

(1)

INSTALLERUSER

Fan revs sensor alarm (1)

Denite shutdown

High temperatures (1)

Display

Soware, startup board error alarm (1)

Denite shutdown

(1) If the shutdown or fault persists, contact an authorised company (e.g. 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 room.

2.7 ANTIFREEZE PROTECTION
OPTIONAL.

e water heater can be equipped with an op­tional antifreeze kit to protect it against freezing
down to outdoor temperatures of -15°C. To
install the kit correctly and, more importantly,
to ensure suitable operation, it is necessary to
follow the instructions supplied with the said kit.

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 proce­dures and ensure that the electrical, water and
gas supply lines are shut o and disconnected.

2.10 GAS SYSTEM NOT USED FOR

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 instruc­tions specied in Paragraph 1.17 herein.

MAINTENANCE TECHNICIAN

PERIODS OVER 12 MONTHS.

17

CHECK

3

AND MAINTENANCE

3.1 HYDRAULIC DIAGRAM.

INSTALLERUSER

MAINTENANCE TECHNICIAN

Key:
1 - Flue hood
2 - Domestic hot water heat exchanger
3 - Burner
4 - Valve/burner pipe
5 - NTC probe (cold water intake)
6 - Flow regulator
7 - Flow meter
8 - Gas valve

9 - NTC probe (hot water outlet)
10 - Nozzle manifold unit
11 - Limit thermostat
12 - Sealed chamber
13 - Fan

AC - Domestic hot water outlet
AF - Domestic cold water inlet
G - Gas supply

18

23

P

3.2 WIRING DIAGRAM.

INSTALLERUSER

Y
PK
GY
BU
W
BK

BR
BR
BL
BR
P
BK
BK

Colour code key:

P - Purple

GY - Grey

BK - Black

R - Red

W - White

BL - Blue

BR - Brown

BU - Light Blue

PK - Pink

Y - Yellow

BR

BL

BR

BL

BL

BR

MAINTENANCE TECHNICIAN

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

HM - Gas shutter for high modulation

W
R
BK
GY
GY
P

19

24

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. 23) 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.

INSTALLERUSER

If the code is wrong, or if the time envisaged
for the operation should drop, the appliance
automatically goes back to the standby or op­eration 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 but­ton 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,

MAINTENANCE TECHNICIAN

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.

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.

Two calibration methods are possible for the
gas valve:

- MANU. Enables a partial modication of the

values; it will be possible to deviate from the
set value by about +/- 1.5 mbar.

- AUTO. Enables to reset the values and perform

a complete calibration of the gas valve (e.g.:
aer replacing the valve, the board or following
a gas transformation).

e standard procedure is MANU.

e AUTO procedure can only be accessed by
the Authorised Assistance Technical Service (Ref.
Par. 3.5).

To access the MANU procedure, proceed as
follows:

- 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. 35) 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

25

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 displayed
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 wording 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 displays ( ).

Attention: to exit the menu, press the reset button 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.

27

28

29

26

20

No.

parameter

02

08

09 Ignition power 0...40 40

Gas type
0 = methane
1 = LPG

DHW mode o
0 = xed
1 = linked to the DHW setpoint

Description Range Default value

0-1

0-1 0

depending on the type of gas for which the boiler is

set in the factory

10 Ignition curve 0 - 3 1

LPG gas type

13

17

18

26

27 Modulation coil reactivity 0 - 1 0

28

Attention: any other additional parameters with regard to the previous table must not be changed for any reason.

1 = propane
2 = butane

Complete or partial calibration 0...100 0

DHW modulation with ow meter
0 = modulation without ow meter
1 = modulation with ow meter

Type of water heater
10 = not applicable to this model
11 = Caesar Eco 17
12 = not applicable to this model
13 = not applicable to this model

0 = standard water heater installation
1 = water heater connected to a solar system

1-2 1

0-1 1

11 11

0

from 1 to 20

INSTALLERUSER

0

21

MAINTENANCE TECHNICIAN

A

B

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).

Can be caused by: dirty burner, clogged lamel-

INSTALLERUSER

lar pack, intake - exhaust terminal not installed
properly. 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
be low.

Attention: please note that transformation op­erations 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 spring placed on the cold water

ramp (Part. A g. 30);

- disconnect the gas ramps and remove them

(Part. B Fig. 30);

- unscrew the three screws xing the interme-

diate metal-sheet plate (Fig. 31) and lower it
(Fig. 32);

- loosen the side fastening screws of the mani-

fold, remove the side brackets and extract the
gas manifold (Fig. 33);

- 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 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;

- 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.

MAINTENANCE TECHNICIAN

22

30

Complete gas valve calibration
(Accessible ONLY by the Authorised Te chnical
Assistance Service).

To access the AUTO procedure, proceed as
follows:

- set the system’s electric switch O;

- remove the casing;

- remove the cap that closes the service passage

(located on the bracket Fig. 35) 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 (Fig.

35) and connect a pressure gauge;

- close the casing properly;

- set the system’s electric al switch to on and open
the hot water cock.

Access the Parameters menu ( ), as follows:

- with the water heater on, press the reset button
( ) 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;

- 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 17 (com­plete or partial calibration), and press reset: the
value that can be reset will ash and it will be
possible to select value 5 by turning the knob:

- save by pressing the reset button.

Attention: in case of a power failure the procedure
must be repeated.

Access the Calibration menu ( ) as follows:

- press the reset button ( ) until the ashing

MENU and ( ) appear on the display;

- turn the knob to select ( ) (Calibration menu)
and conrm by pressing reset;

- AUTO and ( ) appear on the display to
indicate that the device operates fully;

- Turn the knob until the burner’s maximum
pressure value is displayed on the pressure
gauge (Ref. Parag. 3.10);

- 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. Parag. 3.10);

- press the reset key;

- Press the reset button ( ) until MENU ashes
on the display, then release the button, the
screen displays ( );

- 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 by pressing the reset
button for a while.

Attention: in case of a power failure the procedure
must be repeated.

Attention: write on the adhesive plate provided
the type of gas in which it was transformed, the
date when the transformation was carried out,
the name and signature of the operator who made
the transformation and then stick it close to the
existing plate.

3.6 SOLAR PANELS COUPLING FUNCTION.

All Immergas models are supplied as standard
with the NTC probe applied to the DHW cold
water inlet pipe. e probe can be activated by
setting the parameter “P28”.

When parameter "P28" is equal to zero the
probe is disabled; when instead the parameter
is assigned a value between 1 and 20, the probe
is enabled and the function is activated with a
delay that can be set between 1 and 20 seconds.

e water heater is set up to receive pre-heated
water from a system of solar panels up to a max­imum temperature of 65°C.

Attention: the manufacturer denies any liabil­ity for damage to persons or things caused by
exceeding this temperature.

In any case, it is always necessary to install a mix­ing valve on the hydraulic circuit upstream of the
boiler, on the cold water inlet. Set the temperature
on the mixing valve increased by 5°C with respect
to that set on the water heater, so as to ensure that
the temperature at the water heater inlet does not
exceed the maximum value indicated.
If the temperature detected on the inlet probe
is lower than that set by the user with the knob,
the water heater switches on and goes into mod­ulation until the desired temperature is reached.
On the other hand, if the temperature detected
on the inlet probe is close to or equal to that set
by the user, the water heater does not switch on.

INSTALLERUSER

23

MAINTENANCE TECHNICIAN

INSTALLERUSER

3.7 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

screws situated in the lower part of the water
heater and release the casing from the upper

31

32

33

part (Fig. 36);

- remove the cap that closes the service passage

(situated on the bracket - Fig. 35) and make it
pass through the hole of the silicone pipe of the
pressure gauge;

- loosen the pressure point screw upstream of the

gas valve (Fig. 35) 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

pressure point screw upstream of the gas valve
again;

- if there are seals, they must be restored.

3.8 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 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.

MAINTENANCE TECHNICIAN

Key:
1 - Pressure point downstream of the valve
2 - Pressure point upstream of the valve
3 - Service passage

34

1

2

3

24

35

1

c

3.9 CASING REMOVAL.

To facilitate water heater maintenance, the casing
can be completely removed by following these
simple instructions (Fig. 36):

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).

INSTALLERUSER

c

b

3

2

MAINTENANCE TECHNICIAN

a

1

a

36

25

3.10 COMBUSTION PARAMETERS.

G20 G30 G31

Supply pressure mbar 20 28-30 37

Caesar Eco 17

Diameter of the main burner nozzle (No. of nozzles) (*) mm 0.86 (30) - 0.83 (4) 0.50 (30) - 0.48 (4) 0.50 (30) - 0.48 (4)
Nozzles (*) N. 34 34 34
P.C.I. (15° C 1013 mbar) MJ/m
WI (15° C 1013 mbar) MJ/m

Consumption

INSTALLERUSER

Max./min. burner pressure mbar 12.9 - 2.6 28.1 - 4.8 35.8 - 5.7
Min./max. ue ow rate at max heat output kg/h 50.558 - 77.416 42.024 - 72.156 39.939 -73.766
Flue temperature at min./max. output °C 64 - 184 54 - 172 62 - 184
Emissions of nitrogen oxides (NOx) mg/kWh 44 56 35
Air ow rate Nm3/h 59.622 55.544 56.617

(*): It is strictly forbidden to replace the nozzles individually. If necessary, replace the entire manifold.

3

3

m3/h 3.49 - ­kg/h - 2.60 2.56

34.02 116.09 88.00

45.67 80.58 70.69

3.11 TECHNICAL DATA.

Caesar Eco 17

Nominal heat input (Qn) kW (kcal/h) 33.0 (28380)
Minimum heat input (Qm) kW (kcal/h) 5.6 (4820)
Nominal heat output (useful) (Pn) kW (kcal/h) 29.4 (25280)
Minimum heat output (useful) (Pm) kW (kcal/h) 5.1 (4390)
Domestic hot water ow limiter l/min 12
Flow rate capacity in continuous duty (∆T 35°C) l/min 12
Minimum water ow rate ignition l/min 2
Domestic hot water adjustable temperature °C 37 - 60
Minimum water pressure bar 0.13
Maximum water pressure bar 10
Water heater weight kg 17
Fan residual head without pipes Pa 115
Electrical connection V/Hz 230/50
Installed electric power W 74
Equipment electrical system protection - IPX5D
Type of appliance B22 / B22P / B32 / C12 / C12x / C32 / C32x / C42 / C42x /C52 / C52x / C62 / C62x / C82 / C82x
Category II2R3R

MAINTENANCE TECHNICIAN

- 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.

26

3.12 PRODUCT FICHE IN COMPLIANCE WITH REGULATION 812/2013.

Caesar Eco 17

CAESAR ECO 17

XL

A

28 19

56 dB

kWh/annum GJ/annum

2017

Parameter value

Annual electricity consumption for the
domestic hot water function (AEC)

Annual fuel consumption for the domestic
hot water function (AFC)

Water heating energy eciency ( ηwh) 80 %

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.

812/2013

28 kWh

19 GJ

27

3.13 PARAMETERS FOR FILLING IN THE

PACKAGE FICHE.

Should you wish to install an assembly, starting
from the Caesar Eco 17 water heater, use the
package che in Fig. 39.
To complete it properly, ll the relevant spaces
(as shown in the assembly sheet facsimile Fig. 37)
with the values shown in tables Fig. 38.

Facsimile for lling in the domestic hot water production system package che.

e remaining values must be obtained from
the technical data sheets of the products used
to make up the assembly (e.g. solar devices, in­tegration heat pumps, temperature controllers).
Use board Fig. 39 for “assemblies” related to the
domestic hot water function (e.g.: water heater
+ solar thermal system).

Water heating energy efciency of the water heater

Stated load prole:

Solar contribution

From the board of the solar device

( 1.1 x ‘I’ - 10 % ) x ‘II’ - ‘III’ - ‘I’ =

Water heating energy efciency of the assembly in
average climate conditions

Water heating energy efciency class of the assembly in average climate conditions

G F E D C B A A

M

L

XL

XXL

< 27 %

< 27 %

< 27 %

< 28 %

≥ 27 %

≥ 27 %

≥ 27 %

≥ 28 %

≥ 30 %

≥ 30 %

≥ 30 %

≥ 32 %

Auxiliary electricity

≥ 33 %

≥ 36 %

≥ 34 %

≥ 37 %

≥ 35 %

≥ 38 %

≥ 36 %

≥ 40 %

≥ 39 %

≥ 50 %

≥ 55 %

≥ 60 %

≥ 65 %

≥ 75 %

≥ 80 %

≥ 85 %

+

A

≥ 100 %

≥ 115 %

≥ 123 %

≥ 131 %

+

++

A

≥ 130 %

≥ 150 %

≥ 160 %

≥ 170 %

1

‘I’

2

3

+++

≥ 163 %

≥ 188 %

≥ 200 %

≥ 213 %

%

%

%

Water heating energy efciency class in colder and hotter climate conditions

3 2

Colder: - 0.2 x =

3 2

Hotter: + 0.4 x =

The energy efciency of the set of products indicated in this sheet may not reect the actual energy
efciency after installation since such efciency is affected by additional factors, such as the heat loss
in the distribution system and the size of the products compared to the size and features of the building.

%

%

28

37

Parameters for lling in the DHW package che.

Parameter Caesar Eco 17

‘I’ 80

‘II’ *

‘III’ *

* to be determined according to Regulation 812/2013 and transient calculation methods

as per Notice of the European Community no. 207/2014.

Domestic hot water production system package che.

38

Water heating energy efciency of the water heater

Stated load prole:

Solar contribution

From the board of the solar device

( 1.1 x _____ - 10 % ) x _____ - ____ - ______ =

Water heating energy efciency of the assembly in
average climate conditions

Water heating energy efciency class of the assembly in average climate conditions

G F E D C B A A

M

L

XL

XXL

< 27 %

< 27 %

< 27 %

< 28 %

≥ 27 %

≥ 27 %

≥ 27 %

≥ 28 %

≥ 30 %

≥ 30 %

≥ 30 %

≥ 32 %

Auxiliary electricity

≥ 33 %

≥ 36 %

≥ 34 %

≥ 37 %

≥ 35 %

≥ 38 %

≥ 36 %

≥ 40 %

≥ 39 %

≥ 50 %

≥ 55 %

≥ 60 %

≥ 65 %

≥ 75 %

≥ 80 %

≥ 85 %

+

A

≥ 100 %

≥ 115 %

≥ 123 %

≥ 131 %

+

++

A

≥ 130 %

≥ 150 %

≥ 160 %

≥ 170 %

≥ 163 %

≥ 188 %

≥ 200 %

≥ 213 %

1

_____

2

3

+++

%

%

%



Water heating energy efciency class in colder and hotter climate conditions

3 2

Colder: - 0.2 x =

3 2

Hotter: + 0.4 x =

The energy efciency of the set of products indicated in this sheet may not reect the actual energy
efciency after installation since such efciency is affected by additional factors, such as the heat loss
in the distribution system and the size of the products compared to the size and features of the building.

%

%

29

39

30

31

immergas.com

Immergas S.p.A.
42041 Brescello (RE) - Italy
Tel. [phone]
Fax [phone]

Certied company ISO 9001

is instruction booklet is made of ecological paper. Code 1.043165ENG - rev. ST.004073/000 - 07/19 - Inglese per IRLANDA (IE)