Immergas JULIUS 11 4 ERP Operating instructions

JULIUS 11 4 ERP
JULIUS 14 4 ERP
EN
Instruction and
recommendation booklet
*1.038493ENG*

Immergas S.p.A. declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without prior notice.
Dear Customer,
Our compliments 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 suggestions regarding the correct use of the appliance, the respect of which, will conrm your satisfaction for 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 recommendations
All Immergas products are protected with suitable transport packaging.
e material must be stored in dry environments protected against bad weather.
e instruction book is an integral and essential part of the product and must be consigned to the new user also 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 an authorised
company, which has specic technical expertise in the system sector, as required by Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to people, animals
and objects. Read the instructions provided with the product carefully to ensure a proper installation.
Maintenance must be carried out by an authorised company. e Authorised Aer-sales Service represents a guarantee of qualication 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 damages and the
appliance warranty is invalidated.
For further information regarding legislative and statutory provisions relative to the installation of gas heat generators, consult the Immergas site at the
following address: www.immergas.com.
Mauro Guareschi
Research & Development Director
Signature:
CE DECLARATION OF CONFORMITY
(according to ISO/IEC 17050-1)
e company IMMERGAS S.p.A., with registered oce in via Cisa Ligure 95 42041 Brescello (RE) whose design, manufacturing, and aer sale assistance
processes comply with the requirements of standard UNI EN ISO 9001:2008,
DECLARES that:
JULIUS 11 4 ERP AND 14 4 ERP water heaters comply with the following European Directives and Delegated European Regulations:
“Eco-design” Directive 2009/125/EC, “Energy labelling” Directive 2010/30/EC, EU Regulation 812/2013, EU Regulation 814/2013, “Gas Appliance”
Directive 2009/142/EC.

INDEX
1 Water heater installation ..........................5
1.1 Installation recommendations.................5
1.2 Main dimensions.......................................6
1.3 Gas connection..........................................6
1.4 Hydraulic connection...............................6
1.5 Electric power supply................................6
1.6 Ventilation of the rooms. .........................6
1.7 Flue ducts. ..................................................7
1.8 Flues/Chimneys.........................................7
1.9 Gas system start-up...................................7
1.10 Appliance start-up (ignition). .................7
1.11 Kits available on request...........................7
1.12 Water heater components. .......................8
2 Use and maintenance instructions..........9
2.1 Cleaning and maintenance. .....................9
2.2 Ventilation of the rooms.............................9
2.3 General warnings......................................9
2.4 Control panel.............................................9
2.5 Use of the water heater. ............................9
2.6 Description of the anomalies.................10
2.7 Switching o the water heater................10
2.8 Replacing the batteries. ..........................10
2.9 Emptying the water heater. ....................10
2.10 Protection against freezing. ...................10
2.11 Case cleaning...........................................10
2.12 Decommissioning...................................10
3 Checks and maintenance .......................11
3.1 Hydraulic diagram. .................................11
3.2 Wiring diagram.......................................12
3.3 Troubleshooting. .....................................12
3.4 Converting the water heater to other
types of gas...............................................12
3.5 Possible adjustments...............................12
3.6 Yearly appliance check and maintenance.12
3.7 Removing the casing...............................13
3.8 Variable heat output................................14
3.9 Combustion parameters.........................15
3.10 Technical data..........................................16
3.11 Key for data nameplate...........................16
3.12 Product che (in compliance with
Regulation 812/2013). ............................17
3.13 Parameters for lling in the package che. 18
USER pageINSTALLER page MAINTENANCE TECHNICIAN page

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1-1
INSTALLERUSERMAINTENANCE TECHNICIAN
1WATER HEATER INSTALLA TION
1.1 INSTALLATION RECOMMENDA
TIONS.
e Julius water heater has been designed for wall
installation. It must be used for the production
of domestic hot water and similar purposes.
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. 1-1).
e place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural) such to allow
(always in safety, efficiency and comfortable
conditions):
- installation (according to the provisions of the
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (to outdoors in the place for loading
and transporting the appliances and compo-
nents) as well as their eventual replacement
with appliances and/or equivalent components.
Only professionally enabled 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.
Before installing the appliance, ensure that it is
delivered in perfect condition; if in doubt, contact
the supplier immediately. Packing materials (sta-
ples, 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 sucient space for normal ser-
vicing; therefore it is advisable to leave clearance
of at least 3 cm between the water heater casing
and the vertical sides of the cabinet. Leave ad-
equate space above the water heater for possible
water and ue removal connections.
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 regulations:
“Julius” water heaters cannot be installed:
- in bedrooms or bathrooms;
- in areas with a risk of re (for example: garages)
- this provision also applies for ue ducts;
- on the vertical projection of hobs;
- in places/environments that constitute com-
mon parts of oce condominiums such as
stairs, cellars, entrance halls, attics, los, escape
routes, etc. if they are not located inside techni-
cal compartments under the responsibility of
each individual building and only accessible
to the user (for the features of the technical
compartments, see the technical standards in
force).
Moreover, open chamber water heaters 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.). ese may be damaging for
the components of the appliance and jeopardise
functioning.
It is also appropriate that they are not installed in
places where wood-burning heat generators are
present (open res), which are not sealed with
respect to the installation environment.
Attention: wall mounting of the water heater
must guarantee stable and ecient support for
the generator
e plugs (standard supply) are to be used only in
conjunction with the mounting brackets or xing
template 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 support.
N.B.: the hex head screws supplied in the blister
pack are to be used exclusively to x the relative
mounting bracket to the wall.
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.
ey must also be installed in an environment
in which the temperature cannot fall below 0°C.
ey must not be exposed to atmospheric agents.
YES NO

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1-3
INSTALLERUSERMAINTENANCE TECHNICIAN
1.2 MAIN DIMENSIONS.
Height
(mm)
Width
(mm)
Depth
(mm)
D
(mm)
P
(mm)
630 350 230
Julius 11 4 ERP
Ø 110
Julius 14 4 ERP
Ø 130
Julius 11 4 ERP
103
Julius 14 4 ERP
120
CONNECTIONS
GAS DOMESTIC HOT WATER
G U E
3/4” 1/2” 1/2”
Key:
AC - Domestic hot water outlet
AF - Domestic cold water inlet
G - Gas supply
1.3 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er-
ent, the water heater must be converted for op-
eration with the other type of gas (see converting
appliance for other gas types). e dynamic gas
supply (methane or LPG) pressure must also be
checked according to the type used in the water
heater, which must comply with the technical
standards in force, as insufficient levels can
reduce generator output and cause malfunctions.
A type-approved and certied gas cut-o cock
must be inserted on the gas pipe before connec-
tion to the appliance.
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 technical
standards in force.
Fuel gas quality. e appliance was designed
to operate with combustible gas free of impuri-
ties; otherwise it is advisable to t special lters
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 heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.
1.4 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 connec-
tions must be made in a rational way following
the set-up of the water heater couplings on the.
Attention: to preserve the duration and the ef-
ciency features of the appliance, in the presence
of water whose features can lead to the deposit of
scale, installation of the “polyphosphate dispenser”
kit is recommended.
1.5 ELECTRIC POWER SUPPLY.
is water heater is powered by direct current
via one or two 1.5 V “LR 20” alkaline batteries.
e use of one or two batteries varies function-
ing autonomy.
e batteries are housed in a relevant compart-
ment organised in the lower le area, near to the
hydraulic couplings (Fig. 1-3).
N.B.: e appliance is supplied by Immergas
with one battery placed horizontally on the bat-
tery compartment and therefore not connected.
In the ignition phase, it is therefore necessary to
connect it, setting it up in the correct position.
Attention: water heater pipes must never be used
to earth the electric or telephone lines. Ensure
that this does not occur before the batteries are
inserted.
1.6 VENTILATION OF THE ROOMS.
In the room in which the water heater is installed
it is necessary that at least as much air ows as
that requested for by normal combustion of the
gas and ventilation of the room. Natural air ow
must take place directly through:
- permanent openings in the walls of the room
to be ventilated that lead towards the outside;
- ventilation pipes, individual or branched type.
e air used for ventilation must be withdrawn
directly from outside, in an area away from
sources of pollution. Natural air flow is also
allowed indirectly by air intake from adjoining
rooms. For further information relative to venti-
lation of the rooms follow that envisioned in the
current technical regulation.
Evacuation of foul air. In the rooms where the
gas appliances are installed it may also be neces-
sary, as well as the intake of combustion agent air,
to evacuate foul air, with consequent intake of a
further equal amount of clean air. is must be
realised respecting the provisions of the technical
regulations in force.
1.7 FLUE DUCTS.
e gas appliances with attachment for the ue
gas discharge pipe must have direct connection
to chimneys or safely ecient ues. e combus-
tion products can be discharged directly outside
only if these are missing, as long as the current
technical regulations for the ue terminal are
respected as well as the existing laws.
Connection to chimneys or ues. e connec-
tion of the appliances to a chimney or ue takes
place by means of ue ducts.
In the event of ttings with pre-existing ues, these
must be perfectly clean because the detachment
of any waste from the walls during functioning,
could block the passage of ue gases, thus causing

7
1-4
INSTALLERUSERMAINTENANCE TECHNICIAN
extremely dangerous situations for the user.
e ue ducts must be connected to the chimney
or ue in the same room in which the appliance
is installed or, at most, in the adjoining room and
must comply with the requirements indicated
by the current technical regulations (Fig. 1-4).
1.8 FLUES/CHIMNEYS.
For the appliances with natural draught indi-
vidual chimneys and branched ues can be used.
Individual chimneys. e individual ues must
be dimensioned with respect to the standard
in force.
Branched ues. In buildings with lots of oors,
branched flues can be used for the natural
draught evacuation of combustion products. New
ues must be designed following the calculation
method and provisions of the regulation.
Chimney caps. e chimney cap is a device
positioned on the top of an individual chimney
or branched collective ue. is device promotes
the dispersion of combustion products, even in
adverse weather conditions, and prevents the
deposit of foreign bodies.
It must satisfy the requisites set forth in the rela-
tive regulation.
e outlet quota, corresponding to the top of the
chimney/ue, independently of any caps, must
be out of the “respect area”, in order to prevent
the formation of counter-pressures that impede
the free discharge of the combustion products
into the atmosphere. It is therefore necessary to
use the minimum heights indicated in the gures
stated in current technical regulations.
Direct exhaust outside. e natural draught
appliances, envisioned to be connected to a
chimney or a ue, can discharge the combus-
tion products directly to the outside, through
a pipe passing through the perimeter walls of
the building. In this case discharge takes place
through an ue duct, which is connected to a
draught terminal at the outside.
Positioning the draught terminals. e draught
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 ue gas exhaust is allowed for natural
or forced draught gas appliances with a heating
power range from 4 to 35 kW, provided the
conditions as per the current technical standards
are respected.
Important: it is prohibited to put the fumes
exhaust control device out of order voluntarily.
Every piece of this device must be replaced using
original spare parts if they have deteriorated. In
the case of repeated interventions of the fumes
exhaust control device, check the fumes exhaust
ue and the ventilation of the room in which the
water heater is located.
1.9 GAS SYSTEM STARTUP.
To start up the system, refer to the technical
standard in force: is divides the systems and
therefore the start-up operations into three
categories: new systems, modied systems, re-
activated systems.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open 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;
1.10 APPLIANCE STARTUP IGNITION.
In order to issue the Declaration of Conform-
ity required by the laws in force, the following
requirements must be fullled to commission
the water heater (the operations listed below
must only be performed by a qualied rm and
without any unauthorised persons):
- check that the internal system is properly sealed
according to the specications set forth by
technical regulations in force;
- ensure that the type of gas used corresponds to
water heater settings;
- Check that there are external factors that may
cause the formation of fuel pockets;
- switch the appliance on and check correct
ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the
manual (see par. 3.8);
- check the correct ventilation of the rooms;
- check the existing draught during normal
functioning of the appliance, e.g. a draught
gauge positioned at the exit of the appliance
combustion products;
- check that there is no backow of combustion
products into the room, even during function-
ing of fans;
- ensure that the chimney safety device inter-
venes in the event of gas supply failure and
check the relative intervention time;
e water heater must not be started up even if
only one of the checks should be negative.
1.11 KITS AVAILABLE ON REQUEST.
• Polyphosphate dispenser kit (on request). e
polyphosphate dispenser reduces the forma-
tion of lime-scale and preserves the original
heat exchange and domestic hot water produc-
tion conditions. e water heater is prepared
for application of the polyphosphate dispenser
kit.
• Gas interception cock kit (on request). e
water heater is set-up for installation of the
gas interception cock to be inserted on the fuel
supply pipe. e gas cock is indispensable and
must be type-approved for the pre-xed use.
• Gas pressure stabiliser kit. e water heater
is set-up for installation of the gas pressure
stabiliser kit to be inserted on the fuel sup-
ply pipe, which allows to have the supply at a
constant pressure, maintaining the water heater
performance unaltered.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
minimum slope 5%
2500 mm max.

8
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INSTALLERUSERMAINTENANCE TECHNICIAN
1.12 WATER HEATER COMPONENTS.
Key:
1 - Fumes hood
2 - Detection electrode
3 - Pilot burner
4 - Ignition electrode
5 - Ignition and ame control P.C.B.
6 - battery compartment
7 - Connection pipe pressure point
8 - Chimney safety thermostat
9 - Overheating safety thermostat
10 - Valve/burner pipe pressure point
11 - Gas selector
12 - Temperature selector switch
13 - DHW heat exchanger
14 - Combustion chamber
15 - Burner
16 - Water/gas valve

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INSTALLERUSERMAINTENANCE TECHNICIAN
2USE AND MAINTENANCE INSTRUCTIONS
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 VENTILATION OF THE ROOMS.
In the room in which the water heater is installed
it is necessary that at least as much air ows as
that requested for by normal combustion of the
gas and ventilation of the room. e provisions
relative to ventilation, the ue ducts, chimneys
and caps are stated in paragraphs 1.4, 1.5 and 1.6.
If in doubt regarding correct ventilation, contact
an authorised company.
2.3 GENERAL WARNINGS.
Never expose the wall-mounted appliance to
direct vapours from a hob.
Use of the water heater by unskilled persons or
children is strictly prohibited.
Whenever temporary deactivation of the water
heater is decided, disconnect the batteries and
the water and gas supplies must be interrupted.
In the event of work or maintenance to structures
near ducting or ue extraction devices and their
accessories, switch o the appliance and on com-
pletion of the operations ensure an authorised
company veries the eciency of the ducting
or the 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 and dangerous to obstruct the
air intake, even partially, for the ventilation of
the room in which the water heater is installed.
Due to the danger, functioning is also prohibited
in the same room as suction devices or any other
device/appliance that can put the room into de-
pression at the same time as the water heater un-
less there are additional openings dimensioned
in a way to satisfy the further necessity for air.
For the dimensioning of these additional open-
ings, refer to qualified technical staff and to
current technical.
• Attention: using any components that use
electrical power requires some fundamental
rules to be observed:
- never pull electrical cables or leave the appli-
ance exposed to weathering (rain, sunlight,
etc.);
- if the appliance is not to be used for a certain
period, it is good practice to disconnect the
power supply batteries.
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.
2.5 USE OF THE WATER HEATER.
Ignition of the water heater. Before ignition,
check that the DHW inlet valve is open.
- Open the gas cock upstream from the water
heater.
- Turn the gas selector (1) taking it to the position
relative to the power desired (Turning the gas
selector anti-clockwise the power increases and
clockwise the power decreases).
N.B.: with the selector at “=” the gas supply
to the water heater is closed, which thus can-
not ignite.
From this moment the water heater functions
automatically. While there is no request for the
production of DHW, the water heater stays in the
“stand-by” function mode. At every withdrawal
of DHW, the burner ignites and a power that
depends on the size of the withdrawal, with a
maximum value limited by the gas selector (1).
Regulation of the domestic hot water tempera-
ture. e temperature of the hot water supplied
depends on the position of the water selector (2).
By turning the selector clockwise the temperature
increases and anti-clockwise it decreases.
Key:
1 - Gas selector
2 - Temperature selector switch
2.4 CONTROL PANEL.

10
INSTALLERUSERMAINTENANCE TECHNICIAN
2.6 DESCRIPTION OF THE
ANOMALIES.
Ignition block. The water heater ignites au-
tomatically with each demand for hot water
production. If this does not occur within a deter-
mined burner ignition time, the appliance goes
into “ignition block” (the discharge ends on the
pilot unit). To eliminate the “ignition block”, just
stop the withdrawal of DHW and then restore it.
If this phenomenon occurs frequently, contact an
authorised company (e.g. Authorised Aer-Sales
Technical Assistance Service).
Overheating thermostat block. During normal
functioning, if a fault causes excessive over-
heating internally, the water heater goes into
overtemperature block. Aer suitable cooling,
eliminate the "overtemperature block", interrupt-
ing and then restoring the DHW withdrawal. If
this phenomenon occurs frequently, contact an
authorised company (e.g. Authorised Aer-Sales
Technical Assistance Service).
Chimney thermostat block. During operation,
if the ue gas evacuation pipe does not function
correctly, the ue safety thermostat intervenes
blocking the water heater. e latter can only
re-start aer suitable cooling, if normal condi-
tions are restored and in correspondence of a
new request for DHW. If this phenomenon oc-
curs frequently, contact an authorised company
(e.g. Authorised Aer-Sales Technical Assistance
Service).
2.7 SWITCHING OFF THE WATER
HEATER.
Disconnect the batteries and close the gas valve
upstream from the appliance. Never leave the
water heater powered if le unused for prolonged
periods.
2.8 REPLACING THE BATTERIES.
The batteries that power this appliance are
housed in the lower part of the water heater, near
to the hydraulic connections. To replace the bat-
teries, open the relevant compartment by pulling
the lid down and removing the batteries present.
Insert the new batteries respecting the polarities
indicated on the internal wall of the lid itself.
N.B.: only use new “LR20” 1.5V alkaline batter-
ies. Dispose of the batteries replaced according
to the indications supplied by the manufacturer.
Do not use re-chargeable batteries as they could
limit functioning of the water heater.
- If there are leaks of substances from the battery,
avoid contact with the skin.
- If the liquid escaping from the battery comes
into contact with the eyes, rinse thoroughly
with water and contact a doctor.
- If the liquid comes into contact with the skin,
rinse thoroughly with water and soap.
- Contact the manufacturer of the batteries for
further information.
- Do not throw the batteries in the re.
- Remove the batteries if the water heater re-
mains unused for a long period.
- Use a dry, rough cloth to clean the battery
housing, every time they are replaced.
- Contact the local authorities for information
regarding the disposal of the batteries.
2.9 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.
2.10 PROTECTION AGAINST FREEZING.
If the appliance remains inactive, in places at risk
of freezing, it must be emptied to prevent possible
breakage of the hydraulic circuit.
To do this, see the previous paragraph (emptying
the water heater)
2.11 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the water heater casing. Never use abrasive or
powder detergents.
2.12 DECOMMISSIONING.
In the event of permanent shutdown of the
water heater, contact an authorised company
for the procedures and ensure that the batteries
are disconnected and the water and gas supply
lines are shut o.

11
3-1
INSTALLERUSERMAINTENANCE TECHNICIAN
3CHECKS AND MAINTE NANCE
3.1 HYDRAULIC DIAGRAM.
Key:
1 - Overheating safety thermostat
2 - Valve/burner pipe pressure point
3 - Valve intake diaphragm
4 - Connection pipe pressure point
5 - Chimney safety thermostat
6 - Fumes hood
7 - DHW heat exchanger
8 - Pilot group
9 - Burner
10 - Water/gas valve
AC - Domestic hot water outlet
AF - Domestic cold water inlet
G - Gas supply

12
3-2
1 2
3
4
8
5
6
5 5
4
5
9
9
7
INSTALLERUSERMAINTENANCE TECHNICIAN
3.3 TROUBLESHOOTING.
N.B.: Maintenance operations must be carried
out by an authorised company (e.g. Authorised
Aer-Sales Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing eciency of gas intake
circuit.
- Irregular combustion (red or yellow ame).
When the burner is dirty or the water heater
lamellar pack is blocked. Clean the burner or
the lamellar pack.
- e water heater produces condensate. is
can be caused by obstructions of the chimney
or ues with height or section not proportioned
to the appliance. It can also be determined by
functioning at water heater temperatures that
are excessively low. In this case, make the water
heater run at higher temperatures.
- Intervention of the overheating thermostat. It
can depend on a anomaly at the water-gas valve
or on the clogged heat exchanger.
- Ignition block and Chimney thermostat block.
See par. 2.6.
- Frequent interventions of the chimney safety
thermostat. Can be due to:
- obstructions on the ue gas circuit. Check the
ue. e latter can be blocked or not have a
suitable height/section for the water heater.
- Insucient ventilation (see par. 1.4).
- Poor water ow: if, as a result of lime scale (cal-
cium and magnesium), the domestic hot water
system does not work properly contact an au-
thorised company for descaling e.g. Authorised
Aer-Sales Technical 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.
3.4 CONVERTING THE WATER HEATER
TO OTHER TYPES OF GAS.
If the appliance has to be converted to a dier-
ent gas type to that specied on the data plate,
request the relative conversion kit for quick and
easy conversion.
e gas conversion operation must be carried
out by an authorised company (e.g. Authorised
Technical Aer-Sales Service).
3.5 POSSIBLE ADJUSTMENTS.
• Regulation of the water heater heat output (see
par. 2.5).
3.6 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.
- Clean the pilot burner.
- Visually check the draught-breaker/anti-wind
device for deterioration or corrosion.
- Check ignition and operation.
- Check correct burner calibration.
- Check correct operation of control and adjust-
ment devices.
- Check that the internal system is properly
sealed according to technical regulations in
force;
- Check the intervention of the device against no
gas carried out by the ionisation ame control:
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- ue exhaust control thermostat.
- Check the condition and integrity of the electri-
cal system and in particular:
- supply voltage cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
3.2 WIRING DIAGRAM.
Key:
E1 - Ignition electrodes
E2 - Detection electrode
E3 - Safety thermostat
E4 - Flue safety thermostat
Y1 - Water/gas valve
Y2 - Pilot solenoid valve
Y3 - Main shutter solenoid valve
S1 - DHW withdrawal microswitch
1 - Battery compartment
2 - Ignition board
3 - is cable as a red heat shrinkable lm
in the position indicated. It must be
inserted on electrode E2
4 - Pilot
5 - Red
6 - White
7 - Green
8 - Orange
9 - Brown

13
3-3
3
4
4
c
e
e
d
2
1
1
a
a
a
b
INSTALLERUSERMAINTENANCE TECHNICIAN
3.7 REMOVING THE CASING.
To facilitate water heater maintenance the casing
can be completely removed as follows:
1) Loosen the lower screws (a) that x the lower
protection grid (b) and the casing (c).
2) Release the casing (c) from the lower brackets
(d) pulling the sides slightly outwards.
3) Pull the casing towards you in the lower side.
4) Push the casing upwards in a way to be able
to extract it from the upper hooks (e).

14
INSTALLERUSERMAINTENANCE TECHNICIAN
3.8 VARIABLE HEAT OUTPUT.
N.B.: gas ow rates refer to heating power below
a temperature of 15°C and pressure of 1013 mbar.
Burner pressure values refer to use of gas at 15°C.
METHANE (G20) BUTANE (G30) PROPANE (G31)
THERMAL
POWER
THERMAL
POWER
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
(kW) (kcal/h) (m3/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O)
20.1 17286 2.41 10.50 107.1 1.80 24.90 253.9 1.77 31.80 324.3
19.5 16770 2.35 10.00 101.9 1.75 23.79 242.6 1.73 30.37 309.7
18.5 15910 2.24 9.16 93.4 1.67 21.94 223.8 1.65 27.98 285.4
17.5 15050 2.13 8.33 84.9 1.59 20.11 205.1 1.56 25.62 261.3
16.5 14190 2.02 7.51 76.6 1.50 18.30 186.6 1.48 23.29 237.5
15.5 13330 1.90 6.71 68.4 1.42 16.52 168.5 1.39 21.01 214.2
14.5 12470 1.78 5.92 60.4 1.33 14.78 150.7 1.31 18.77 191.4
13.5 11610 1.66 5.16 52.6 1.24 13.09 133.5 1.22 16.60 169.3
12.5 10750 1.54 4.43 45.1 1.15 11.46 116.8 1.13 14.51 148.0
11.5 9890 1.41 3.72 37.9 1.06 9.88 100.8 1.04 12.50 127.5
10.5 9030 1.29 3.04 31.0 0.96 8.38 85.5 0.95 10.58 107.9
9.5 8170 1.16 2.40 24.5 0.87 6.95 70.9 0.85 8.76 89.3
8.5 7310 1.04 1.80 18.4 0.78 5.60 57.1 0.76 7.04 71.8
7.8 6708 0.95 1.40 14.3 0.71 4.70 47.9 0.70 5.90 60.2
METHANE (G20) BUTANE (G30) PROPANE (G31)
THERMAL
POWER
THERMAL
POWER
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
(kW) (kcal/h) (m3/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O)
24.4 20984 2.89 11.30 115.2 2.15 24.98 254.7 2.12 31.93 325.6
24.0 20640 2.84 10.96 111.7 2.12 24.35 248.3 2.08 31.17 317.9
23.0 19780 2.72 10.12 103.2 2.03 22.82 232.7 2.00 29.30 298.8
22.0 18920 2.60 9.31 94.9 1.94 21.35 217.7 1.91 27.49 280.3
21.0 18060 2.49 8.54 87.0 1.86 19.92 203.1 1.83 25.73 262.4
20.0 17200 2.37 7.79 79.5 1.77 18.54 189.1 1.74 24.03 245.0
19.0 16340 2.25 7.08 72.2 1.68 17.21 175.5 1.65 22.38 228.2
18.0 15480 2.14 6.39 65.2 1.60 15.93 162.5 1.57 20.78 211.9
17.0 14620 2.02 5.74 58.5 1.51 14.70 149.9 1.48 19.23 196.1
16.0 13760 1.91 5.12 52.2 1.42 13.52 137.9 1.40 17.73 180.8
15.0 12900 1.79 4.52 46.1 1.34 12.38 126.3 1.31 16.28 166.1
14.0 12040 1.67 3.96 40.3 1.25 11.29 115.1 1.23 14.89 151.8
13.0 11180 1.56 3.42 34.9 1.16 10.25 104.5 1.14 13.54 138.0
12.0 10320 1.44 2.91 29.7 1.07 9.25 94.3 1.06 12.24 124.8
11.0 9460 1.32 2.44 24.8 0.99 8.30 84.6 0.97 10.99 112.0
10.0 8600 1.20 1.99 20.3 0.90 7.39 75.4 0.88 9.78 99.8
9.8 8428 1.18 1.90 19.4 0.88 7.22 73.6 0.87 9.55 97.4

15
INSTALLERUSERMAINTENANCE TECHNICIAN
3.9 COMBUSTION PARAMETERS.
G20 G30 G31
Julius 11 4 ErP
Gas nozzle diameter mm 1.30 0.77 0.77
supply pressure mbar (mm H2O) 20 (204) 29 (296) 37 (377)
Pilot nozzle diameter mm 0.26 0.22 0.22
Gas cone seats mm 9.0 7.0 7.0
Gas cone inlet code 0864 0681 0681
Gas cone outlet code 0870 0679 0679
Gas inlet valve diaphragm mm 4.70 4.70 4.70
Flue ow rate at nominal heat output kg/h 46 46 47
Flue ow rate at min heat output kg/h 39 38 39
CO2at Q. Nom./Min. % 7.10 / 3.15 8.32 / 3.75 8.00 / 3.60
CO with 0% O2at Nom./Min. Q. Nom./Min. ppm 70 / 50 110 / 56 52 / 69
NOxat 0% of O2at Q. Nom./Min. mg/kWh 205 / 135 270 / 149 235 / 142
Flue temperature at nominal output °C 183 189 184
Flue temperature at minimum output °C 126 130 126
Julius 14 4 ErP
Gas nozzle diameter mm 1.35 0.80 0.80
supply pressure mbar (mm H2O) 20 (204) 29 (296) 37 (377)
Pilot nozzle diameter mm 0.26 0.22 0.22
Gas cone seats mm 9.0 9.0 9.0
Gas cone inlet code 0855 0881 0881
Gas cone outlet code 0863 0884 0884
Gas inlet valve diaphragm mm 5.8 5.8 5.8
Flue ow rate at nominal heat output kg/h 55 55 58
Flue ow rate at min heat output kg/h 53 48 49
CO2at Q. Nom./Min. % 7.15 / 2.85 8.20 / 3.70 7.80 / 3.55
CO with 0% O2at Nom./Min. Q. Nom./Min. ppm 60 / 45 86 / 76 37 / 124
NOxat 0% of O2at Q. Nom./Min. mg/kWh 195 / 150 282 / 153 250 / 150
Flue temperature at nominal output °C 153 156 150
Flue temperature at minimum output °C 111 122 119

16
INSTALLERUSERMAINTENANCE TECHNICIAN
Julius 11 4 ErP Julius 14 4 ErP
Nominal heat input kW (kcal/h) 22.8 (19621) 27.3 (23446)
Minimum heat input kW (kcal/h) 9.0 (7725) 11.1 (9588)
Nominal heat output (useful) kW (kcal/h) 20.1 (17286) 24.4 (20984)
Minimum heat output (useful) kW (kcal/h) 7.8 (6708) 9.8 (8428)
Heat loss at case with burner On % 1.5 2.0
Chimney losses with burner On % 10.4 8.5
Appliance water content l 0.9 1.0
Domestic hot water adjustable temperature ∆T K 25 - 50 25 - 50
Min. dynamic pressure ON (in ascent) ∆T = 50 K l/min 2.87 3.25
Min. dynamic pressure ON (in ascent) ∆T = 25 K l/min 5.63 5.9
Domestic hot water circuit max. operating pressure bar 10.0 10.0
Maximum ow rate ∆T = 50 °C l/min 5.75 6.80
Maximum ow rate ∆T = 25 °C l/min 12.00 14.00
Full water heater weight kg 12.0 14.0
Empty water heater weight kg 11.1 13.0
Electric power supply Battery 2 Batteries x LR20 1.5 V Alkaline
Type of appliance B11 BS
Category II2H3+
- Flue gas temperature values refer to an air inlet
temperature of 15°C.
- 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.
- e max. sound level emitted during water
heater operation is <55 dBA. e sound level
value is referred to semianechoic chamber tests
with water heater operating at max. heat output,
with extension of ue gas exhaust system ac-
cording to product standards.
N.B.: the technical data is provided on the data plate on the water heater.
3.11 KEY FOR DATA NAMEPLATE.
EN
Md Model
Cod. Md Model code
Sr N° Serial Number
CHK Check
Cod. PIN PIN code
Type Type of installation (ref. CEN TR 1749)
Qnw min. Minimum DHW heat input
Qnmin. CH minimum heat input
Qnw max. DHW maximum heat input
Qnmax. CH maximum heat input
Pnmin. Minimum heat output
Pnmax. Maximum heat output
PMW Maximum domestic hot water pressure
D Specic ow rate
TM Maximum operating temperature
NOxClass NOxClass
3.10 TECHNICAL DATA.
Md Cod. Md
Sr N° CHK Cod. PIN
Type
Qnw/Qnmin. Qnw/Qnmax. Pnmin. Pnmax.
PMW D TM
NOxClass

17
Julius 11 4 ErP Julius 14 4 ErP
III
A++
A+
A
B
C
D
E
F
G
A
B
C
D
E
F
G
M
JULIUS 11 4 ERP
A
61 dB
0
kW/h/annum
7
GJ/annum
III
A++
A+
A
B
C
D
E
F
G
A
B
C
D
E
F
G
L
JULIUS 14 4 ERP
A
61 dB
0
kW/h/annum
12
GJ/annum
3.12 PRODUCT FICHE IN COMPLIANCE WITH REGULATION 812/2013.
Parameter value
Annual fuel consumption for the domestic
hot water function (AFC) 7 GJ
Water heating energy eciency ( ηwh) 66 %
Parameter value
Annual fuel consumption for the domestic
hot water function (AFC) 12 GJ
Water heating energy eciency ( ηwh) 76 %
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.

18
3-4
Water heating energy efciency of the water heater
Water heating energy efciency of the set in
average climate conditions
Water heating energy efciency class of the set in average climate conditions
Water heating energy efciency class in colder and hotter climate conditions
Colder: - 0.2 x =
Hotter: + 0.4 x =
Stated load prole:
Solar contribution
From the board of the solar device
1
%
‘I’
2
%
+
( 1,1 x ‘I’ - 10 % ) x ‘II’ - ‘III’ - ‘I’ =
Auxiliary electricity
3
%
G F E D C B A A+++ A++ A+
< 27 %
< 27 %
< 27 %
< 28 %
≥ 27 %
≥ 27 %
≥ 27 %
≥ 28 %
≥ 30 %
≥ 30 %
≥ 30 %
≥ 32 %
≥ 33 %
≥ 34 %
≥ 35 %
≥ 36 %
≥ 36 %
≥ 37 %
≥ 38 %
≥ 40 %
≥ 39 %
≥ 50 %
≥ 55 %
≥ 60 %
≥ 65 %
≥ 75 %
≥ 80 %
≥ 85 %
≥ 100 %
≥ 115 %
≥ 123 %
≥ 131 %
≥ 130 %
≥ 150 %
≥ 160 %
≥ 170 %
≥ 163 %
≥ 188 %
≥ 200 %
≥ 213 %
M
L
XL
XXL
3 2
3 2
%
%
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.
Facsimile for lling in domestic hot water production system package che.
3.13 PARAMETERS FOR FILLING IN THE
PACKAGE FICHE.
Should you wish to install an assembly, starting
from the Julius (11 4 o 14 4) ErP water heater,
use the package che in Fig. 3-6.
To ll it in correctly, enter the gures shown
in table Fig. 3-5 (as shown in the package che
facsimile Fig. 3-4) .
e remaining values must be obtained from
the technical data sheets of the products used to
make up the assembly (e.g. solar devices, integra-
tion heat pumps, temperature controllers).
Use sheet g. 3-6 for “assemblies” related to the
domestic hot water function (e.g.: water heater +
solar thermal system).

19
3-6

3-5
Water heating energy efciency of the water heater
Water heating energy efciency of the set in
average climate conditions
Water heating energy efciency class of the set in average climate conditions
Water heating energy efciency class in colder and hotter climate conditions
Colder: - 0.2 x =
Hotter: + 0.4 x =
Stated load prole:
Solar contribution
From the board of the solar device
1
%
_____
2
%
+
( 1.1 x _____ - 10 % ) x _____ - ____ - ______ =
Auxiliary electricity
3
%
G F E D C B A A+++ A++ A+
< 27 %
< 27 %
< 27 %
< 28 %
≥ 27 %
≥ 27 %
≥ 27 %
≥ 28 %
≥ 30 %
≥ 30 %
≥ 30 %
≥ 32 %
≥ 33 %
≥ 34 %
≥ 35 %
≥ 36 %
≥ 36 %
≥ 37 %
≥ 38 %
≥ 40 %
≥ 39 %
≥ 50 %
≥ 55 %
≥ 60 %
≥ 65 %
≥ 75 %
≥ 80 %
≥ 85 %
≥ 100 %
≥ 115 %
≥ 123 %
≥ 131 %
≥ 130 %
≥ 150 %
≥ 160 %
≥ 170 %
≥ 163 %
≥ 188 %
≥ 200 %
≥ 213 %
M
L
XL
XXL
3 2
3 2
%
%
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.
Parameter Julius 11 4 ErP Julius 14 4 ErP
‘I’ 66 76
‘II’ * *
‘III’ * *
Parameters for lling in DHW package assembly chart.
* 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.

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is instruction booklet is made of ecological paper Cod. 1.038493ENG - rev. ST.002036/000 - 09/15 - Inglese per IRLANDA (IE)