Immergas Nike Star 24 4 ErP Product manual

NIKE STAR
24 4 ERP
IE
Instruction and
warning book
Installer
User
Maintenance Technician
*1.038183ENG*
Instantaneous wall-hung boilers
with open chamber (type B) and
natural draught
e European regulation 813/2013 provides that
this boiler can be installed only to replace similar
equipment connected to existing branched
multiple ues.

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 forewarning.
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 boiler. 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 boilers. As for the other issues related to boiler installation (e.g. safety in the work
site, environment protection, injury prevention), it is necessary to comply with the provisions specied in the regulations in force and principles of good practice.
In compliance with legislation in force, the systems must be designed by qualied professionals, within the dimensional limits established by the Law. 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, intending sta with specic technical skills in the plant sector, as envisioned by the 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 skilled technical sta. e Immergas Authorised Aer-sales Service represents a guarantee 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 damages and the
appliance warranty is invalidated.
e company IMMERGAS S.p.A., with registered oce in via Cisa Ligure 95 42041 Brescello (RE), declares that the design, manufacturing and aer-sales
assistance processes comply with the requirements of standard UNI EN ISO 9001:2008.
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.

1 Boiler installation......................................4
1.1 Installation recommendations.................4
1.2 Main dimensions.......................................4
1.3 Gas connection..........................................5
1.4 Hydraulic connection...............................5
1.5 Electrical connection................................5
1.6 Remote controls and room
chronothermostats (optional). ................5
1.7 Ventilation of the rooms...........................6
1.8 Evacuation of combustion products: ue
duct and branched multiple ues ...........6
1.9 Flue exhaust control device......................6
1.10 System lling..............................................6
1.11 Gas system start-up................................... 6
1.12 Boiler start up (ignition). .........................6
1.13 Circulation pump......................................7
1.14 Kits available on request...........................8
1.15 Boiler components....................................9
2 Instructions for use and maintenance..10
2.1 Cleaning and maintenance. ...................10
2.2 Ventilation of the rooms.........................10
2.3 General warnings....................................10
2.4 Control panel...........................................10
2.5 Faults and anomaly signals. ...................11
2.6 Boiler shutdown. ....................................12
2.7 Restore heating system pressure............12
2.8 System draining.......................................12
2.9 Anti-freeze protection. ...........................12
2.10 Case cleaning...........................................12
2.11 Decommissioning...................................12
3 Boiler start-up. (Initial check)...............13
3.1 Hydraulic layout......................................13
3.2 Wiring diagram.......................................14
3.3 Troubleshooting. .....................................14
3.4 Converting the boiler to other
types of gas...............................................14
3.5 Checks following conversion to another
type of gas.................................................15
3.6 Possible adjustments...............................15
3.7 Programming the p.C.B. ........................15
3.8 Automatic slow ignition function with
timed ramp delivery................................16
3.9 “Chimney sweep function”.....................16
3.10 Heating timer...........................................16
3.11 Pump anti-block function......................16
3.12 Domestic hot water circuit anti-extruder
function. ...................................................16
3.13 Radiators anti-freeze function...............16
3.14 P.C.B. Periodical self-check....................16
3.15 Casing removal........................................17
3.16 Yearly appliance check and
maintenance.............................................17
3.17 Variable heat power.................................19
3.18 Combustion parameters.........................19
3.19 Technical data..........................................20
3.20 Data plate key...........................................21
3.21 Technical parameters for combination
boilers (in compliance with regulation
813/2013)..................................................22
3.22 Product che (in compliance with
regulation 811/2013)...............................22
3.23 Parameters for lling in
the package che. ....................................23
INDEX
USER pageINSTALLER page MAINTENANCE TECHNICIAN page

4
1-1
1-2
INSTALLERUSER
MAINTENANCE TECHNICIAN
Height
(mm)
Width
(mm)
Depth
(mm)
751 440 240
ATTACHMENTS
GAS DOMESTIC
HOT WATER PLANT
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
1.2 MAIN DIMENSIONS.
N.B.: connection group (optional)
1BOILER INSTALLATION.
1.1 INSTALLATION
RECOMMENDATIONS.
e Nike Star 24 4 ErP boiler has been designed
for wall mounted installation only; they must be
used to heat environments, to produce domestic
hot water and similar purposes.
e 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).
Only professionally authorised companies are
authorised to install Immergas gas appliances.
Installation must be carried out according to the
standards, current legislation and in compliance
with local technical regulations and the required
technical procedures. Installation of the Nike Star
24 4 ErP boiler when powered by LPG must com-
ply with the rules regarding gases with a greater
density than air (remember, as an example, that
it is prohibited to install plants 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 that it
is delivered in perfect condition; if in doubt,
contact the supplier immediately. Packing ma-
terials (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
sucient space for normal servicing; therefore
it is advisable to leave clearance of at least 3 cm
between the boiler casing and the vertical sides
of the cabinet. Leave adequate space above the
boiler for possible water and fume removal con-
nections. It is just as important that the intake
grids are not obstructed. Keep all ammable
objects away from the appliance (paper, rags,
plastic, polystyrene, etc.). Do not place household
appliances underneath the boiler as they could
be damaged if the safety valve intervenes (if
not conveyed away by a discharge funnel), or if
there are leaks from the hydraulic connections;
on the contrary, the manufacturer cannot be
held responsible for any damage caused to the
household appliances.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o immediately and
contact an authorised company (e.g. the Aer-
Sales 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:
- installation of these boilers in bedrooms,
studio ats and bathrooms, or in premises
where there are wood red heaters (or solid
fuel heaters in general) and in premises next
to or connected to them, is subject to the
regulatory/legislative provisions in force in
the country.
- Installation of gas appliances and relevant ue
ducts, ue exhaust pipes and combustion air
intake pipes in premises with a re hazard
(for example: garages, closed parking stalls),
is forbidden.
- Installation on the vertical projection of
cooking hobs is forbidden.
- Installation is also forbidden in places/rooms
that constitute common parts of apartment
buildings such as stairs, cellars, entrance halls,
attics, los, escape routes, etc. if they are not
located inside technical compartments under
the responsibility of each individual unit and
only accessible to the user (for the features of
the technical compartments, see the technical
standards in force).
- these boilers cannot be installed in bedrooms
or shower or bathrooms; ey cannot be in-
stalled in rooms with open res without their
own air ow. ey must be installed in rooms
where the temperature cannot fall below 0°C
and must not be exposed to atmospheric
agents.
- 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 dama-
ging for the components of the appliance and
jeopardise functioning.
- Furthermore, they must be installed in rooms
where the temperature cannot fall below 0°C
and must not be exposed to weathering.
- is natural draught boiler can be connected
only to a multiple branched ue served by
a variety of users in existing buildings. e
boiler takes the combustion air directly from
the installation room and is equipped with
draught-breaker/anti-wind device. Due to
lower eciency, any other use of this boiler
must be avoided as it would lead to greater
consumption and higher operating costs.
Important: Wall mounting of the boiler must
guarantee stable and ecient support for the
generator.
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Domestic hot water inlet
solar valve kit (Optional)
AF - Domestic cold water inlet
R - System return
M - System delivery
V - Electric attachment

5
1-4
1-3
INSTALLERUSER
MAINTENANCE TECHNICIAN
e plugs (standard supply) are to be used only in
conjunction with the mounting brackets or xing
template to x the appliance 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 boilers are used to heat water to below
boiling temperature in atmospheric pressure.
ey must be connected to a heating system and
hot water circuit suited to their performance
and capacity.
1.3 GAS CONNECTION.
Our boilers are designed to operate with methane
gas (G20) and LPG. Supply pipes must be the
same as or larger than the 3/4”G boiler tting.
Before connecting the gas line, carefully clean
inside all the fuel feed system pipes to remove any
residue that could impair boiler eciency. Also
make sure the gas corresponds to that for which
the boiler is prepared (see boiler data-plate). If
dierent, the appliance must be converted for
operation with the other type of gas (see conver-
ting appliance for other gas types). e dynamic
gas supply (methane or LPG) pressure must also
be checked according to the type used in the
boiler, as insucient levels can reduce generator
output and cause malfunctions.
Ensure correct gas cock connection by following
the mounting instructions illustrated in the
figure. The gas supply pipe must be suitably
dimensioned according to current regulations in
order to guarantee correct gas ow to the boiler
even in conditions of maximum generator output
and to guarantee appliance eciency (technical
specications). e coupling system must con-
form to standards.
Combustible gas quality. The appliance has
been designed to operate with gas free of im-
purities; otherwise it is advisable to t special
lters upstream from the appliance to restore
the purity of the gas.
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.
Important: Before making the boiler connec-
tions, carefully clean the heating system on the
primary heat exchanger (pipes, radiators, etc.)
with special pickling or de-scaling products to
remove any deposits that could compromise
correct boiler operation.
A chemical treatment of the thermal system wa-
ter is required, in compliance with the technical
standards in force, in order to protect the system
and the appliance from deposits (e.g., lime scale),
slurry or other hazardous deposits
Water connections must be made in a rational
way using the couplings on the boiler template.
e boiler safety valve outlet must be connected
to an appropriate drain. Otherwise, the manu-
facturer declines any responsibility in case of
ooding if the drain valve cuts in.
Attention: Immergas declines all liability in
the event of damage caused by the inclusion of
automatic lling that is not of its own brand.
In order to meet the system requirements esta-
blished by the technical regulation in force in
relation to the pollution of drinking water, we
recommend installing the IMMERGAS anti-
backow kit to be used upstream of the cold
water inlet connection of the boiler. It is also
recommended that the heat transfer uid (e.g.
water + glycol) entered in the primary circuit
of the boiler (heating circuit), complies with the
local regulations in force.
Important: to preserve the duration of appliance
eciency features, in the presence of water whose
features can lead to the deposit of lime scale,
installation of the “polyphosphate dispenser” kit
is recommended.
1.5 ELECTRICAL CONNECTION.
e Nike Star 24 4 ErP boiler has an IPX4D pro-
tection rating for the entire appliance. Electrical
safety of the unit is reached when it is correctly
connected to an efficient earthing system as
specied by current safety standards.
Important: Immergas S.p.A. declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an
ecient earth system or failure to comply with
the reference standards.
Also ensure that the electrical installation
corresponds to maximum absorbed power
specications as shown on the boiler data-plate.
e boilers are supplied complete with an “X”
type power cable without plug. e power sup-
ply cable must be connected to a 230V ±10% /
50Hz mains supply respecting L-N polarity and
earth connection , this network must also
have a multi-pole circuit breaker with class III
over-voltage category. When replacing the power
supply cable, contact a qualied company (e.g.
the Aer-Sales Technical Assistance Service).
In the event of mains fuse replacement on the
control card, use a 3.15A quick-blow fuse. For
the main power supply to the appliance, never
use adapters, multiple sockets or extension leads.
1.6 REMOTE CONTROLS AND
ROOM CHRONOTHERMOSTATS
OPTIONAL.
e boiler is prepared for the application of room
chronothermostats.
ese components are available as separate kits
to the boiler and are supplied on request.
All Immergas chronothermostats are connected
with 2 wires only. Carefully read the user and
assembly instructions contained in the acces-
sory kit.
• On/O digital chronothermostat (Fig. 1-3). e
chronothermostat allows:
- to set two room temperature values: one for
day (comfort temperature) and one for night
(lower temperature);
- set a weekly programme with four daily
switch on and switch o times;
- selecting the required function mode from
the various possible alternatives:
- manual operation (with adjustable tempe-
rature).
- automatic operation (with set programme).
- forced automatic operation (momentarily
changing the temperature of the automatic
programme)
e chronothermostat is powered by two 1.5V
LR 6 type alkaline batteries;
• Digital Mini Remote Control Device with
climate chronothermostat function (Fig. 1.4).
In addition to the functions described in the
previous point, the Mini CRD panel enables the
user to control all the important information
regarding operation of the appliance and the
heating system with the opportunity of easily
intervening on the previously set parameters
without having to go to the place where the
appliance is installed. e Mini CRD panel
is provided with self-diagnosis to display any
boiler functioning anomalies. e climate chro-
nothermostat incorporated into the remote
panel enables the system delivery temperature
to be adjusted to the actual needs of the room
being heated, in order to obtain the desired
room temperature with extreme precision
and therefore with evident saving in running
costs. e chronothermostat is fed directly by
the boiler by means of the same 2 wires used
for the transmission of data between boiler and
chronothermostat.
Digital Mini Remote Control or On/Off
chronothermostat electrical connections
(Optional). The operations described below
must be performed after having removed the
voltage from the appliance. Any thermostat or
On/O environment chronothermostat must
be connected to clamps 40 and 41 eliminating
On/O digital chrono-thermostat Digital Mini Remote Control (Mini CRD)

6
INSTALLERUSER
MAINTENANCE TECHNICIAN
jumper X40 (Fig. 3-2). Make sure that the On/
O thermostat contact is of the “clean” type, i.e.
independent of the mains supply, otherwise the
electronic adjustment card would be damaged.
e Mini CRD must be connected to clamps 40
e 41 eliminating jumper X40 on the P.C.B. (in the
boiler), (Fig. 3-2).
Important: if the Mini CRD is used, arrange
two separate lines in compliance with current
regulations regarding electrical systems. Boiler
pipes must never be used to earth the electric or
telephone lines. Ensure elimination of this risk
before making the boiler electrical connections.
1.7 VENTILATION OF THE ROOMS.
In the room in which the boiler 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 ventilate 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 ven-
tilation of the rooms follow that indicated by the
standards set and the following modications
and integrations.
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.
1.8 EVACUATION OF COMBUSTION
PRODUCTS: FLUE DUCT AND
BRANCHED MULTIPLE FLUES
e European regulation 813/2013 provides that
this boiler can be installed only to replace simi-
lar equipment connected to existing branched
multiple ues.
Connection to branched multiple ues.
Fitting the appliances to a branched multiple ues
takes place by means of ue ducts.
In the event of ttings with pre-existing ues,
these must be in safe and ecient status and per-
fectly clean because the detachment of any waste
from the walls during functioning, could block
the passage of ue gases, thus causing 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.
1.9 FLUE EXHAUST CONTROL DEVICE
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
boiler is located.
1.10 SYSTEM FILLING.
Once the boiler is connected, proceed with sy-
stem lling via the lling valve (Fig. 2-2). Filling
is performed at low speed to ensure release of air
bubbles in the water via the boiler and heating
system vents. e boiler has a built-in automatic
venting valve on the circulator. Open the radiator
air vent valves. Close radiator vent valves only
when water escapes from them.
Close the lling valve when the boiler manometer
indicates approx. 1.2 bar.
N.B.: during these operations start up the cir-
culation pump at intervals, acting on the main
switch positioned on the control panel.
Vent the circulation pump by loosening the front
cap and keeping the motor running.
Screw the cap back on aer the operation.
1.11 GAS SYSTEM STARTUP.
To start up the system, make reference to the
Standard.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or naked ames;
- bleed all air from pipelines;
- check that the internal system is properly sealed
according to specications.
1.12 BOILER START UP IGNITION.
For the boiler start up (the operations listed
below must only be performed by qualied per-
sonnel and in the presence of sta only):
- check that the internal system is properly sealed
according to specications;
- ensure that the type of gas used corresponds to
boiler settings;
- check that there are no external factors that
may cause the formation of fuel pockets;
- switch the boiler on and ensure correct ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the
manual (parag. 3.17);
- 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 functio-
ning of fans;
- ensure that the safety device is engaged in the
event of gas supply failure and check activation
time;
- check activation of the main switch located
upstream from the boiler.
e boiler must not be started up in the event of
failure to comply with any of the above.

7
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1-6
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.13 CIRCULATION PUMP.
e boiler is supplied with circulator tted with
speed regulator.
ese settings are suitable for most systems.
In fact, the pump is equipped with electronic
control to set advanced functions. For proper op-
eration one must select the most suitable type of
operation for the system and select a speed in the
available range, with a focus on energy savings.
By-pass Regulation (part. 19 Fig. 1-8). e
boiler is supplied with by-pass closed by 1.5 turns
with respect to all open.
If necessary, the by-pass can be regulated to
system requirements from minimum (by-pass
closed) to maximum (by-pass open). Adjust
using a at head screwdriver, turn clockwise to
close the by-pass; turn anti-clockwise to open it.
Display of operation status. During normal
operation the status LED (2) is on green, the four
yellow LEDs (3) indicate circulator absorption
according to the following table:
Circulating pump LED Absorption
G Y Y Y Y
On On O O O
0 ÷ 25 %
G Y Y Y Y
On On On O O
25 ÷ 50 %
G Y Y Y Y
On On On On O
50 ÷ 75 %
G Y Y Y Y
On On On On On
75 ÷ 100 %
Selection of operating mode. To see the current
operation mode it is sucient to press button
(1) once.
To change operation mode press the button
for between 2 to 10 seconds until the current
conguration ashing, each time the button is
pressed all possible functions are scrolled cycli-
cally. Aer a few seconds without doing any
operation the circulator memorises the selected
mode and goes back to operation display.
Attention: e circulator has various built-in
operation modes, however the constant curve
operation mode must be selected according to
the following table.
Circulating pump LED Description
G Y Y Y Y
On On On O O
Do not use
G Y Y Y Y
On On On On O
Constant curve
speed 2
G Y Y Y Y
On On On On On
Constant curve
speed 3 (default)
G Y Y Y Y
On On On O On
Constant curve
speed 4
Constant curve: the circulator operates maintain-
ing constant speed.
Selection button lock. e button has a feature
that locks its operation to prevent accidental
modications, to lock the control panel it is
necessary to press button (1) longer than 10
seconds (during which the current conguration
ashes), the active lock is signalled by all LEDs of
the control panel ashing. To unlock the button
press again longer than 10 seconds.
Real time diagnostics: in the event of mal-
function the LEDs provide information on the
circulator operation status, see table (Fig. 1-6):
Circulating pump LED
(rst red LED) Description Diagnostics Remedy
R Y Y Y Y
On O O O On
Circulator pump blocked The circulator pump cannot restart
automatically due to an anomaly
Wait for the circulator to make auto-
matic release attempts or manually
release the motor sha acting on the
screw in the centre of the head.
If the anomaly persists replace the
circulator.
R Y Y Y Y
On O O On O
Abnormal situation (the circulator
continues operating).
low power supply voltage
Voltage o range Check power supply
R Y Y Y Y
On O On O O
Electrical fault
(Circulator pump blocked)
e circulator is locked due to power
supply too low or serious malfunction
Check the power supply, if the anomaly
persists replace the circulator
Key:
1 - Function selection button
2 - Green (G) / red (R) LED
3 - 4 yellow LEDs (Y)

8
1-7
V4
V4
V3
V3
V2
V2
A4
A4
A3
A3
A2
A2
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.14 KITS AVAILABLE ON REQUEST.
• System shut o valves kit. e boiler is desig-
ned for installation of system shuto valves to
be placed on delivery and return pipes of the
connection assembly. is kit is particularly
useful for maintenance as it allows the boiler to
be drained separately without having to empty
the entire system.
• Polyphosphate dispenser kit. e polyphospha-
te dispenser reduces the formation of lime-scale
and preserves the original heat exchange and
domestic hot production water conditions.
e boiler is predisposed for application of the
polyphosphate dispenser kit.
• Connection unit kit. Includes: pipes, ttings
and cocks (including gas cock), to carry out
all connections to the boiler system.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
Total head available to the plant.
Key:
Vn = Available head
An = Circulator pump absorbed power
Circulator pump absorbed power (W)Circulator pump absorbed power (W)
Flow rate (l/h)
Flow rate (l/h)
Head (kPa)Head (kPa)
Closed bypass
Open bypass

9
1-8
INSTALLERUSER
MAINTENANCE TECHNICIAN
Key:
1 - Fumes hood
2 - System pressure switch
3 - Boiler pump
4 - Domestic hot water ow switch
5 - Gas valve
6 - Domestic hot water probe
7 - System lling valve
8 - Flue safety thermostat
9 - Delivery probe
10 - Rapid heat exchanger
11 - Safety thermostat
12 - Combustion chamber
13 - Ignition and detection electrodes
14 - System expansion vessel
15 - Burner
16 - Vent valve
17 - Manifold
18 - System draining valve
19 - By-pass
20 - 3 bar safety valve
N.B.: connection group (optional)
1.15 BOILER COMPONENTS.

10
2-1
INSTALLERUSER
MAINTENANCE TECHNICIAN
2.4 CONTROL PANEL.
Key:
1 - Reset key
2 - Stand-by key/ summer / winter
3 - Key (+) to increase the domestic hot water
temperature
4 - Key (-) to reduce the domestic hot water
temperature
5 - Key (+) to increase the system water
temperature
6 - Key (-) to reduce the system water
temperature
7 - Boiler manometer
8 - Domestic hot water function
9 - Temperature and error code display
10 - Unit of measurement
11 - Heating mode
12 - Winter
13 - Summer
14 - Output eciency
15 - Flame presence
2INSTRUCTIONS FOR USE AND MAINTENANCE.
2.1 CLEANING AND MAINTENANCE.
Attention: to preserve the boiler’s integrity
and keep the safety features, performance and
reliability, which distinguish it, unchanged over
time, you must execute maintenance operations
on a yearly basis in compliance with what is
stated in the relative point at “annual check and
maintenance of the appliance”, in compliance
with national, regional, or local standards in
force.
2.2 VENTILATION OF THE ROOMS.
In the room in which the boiler 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 and multiple
ues are stated in Par. 1.7 and 1.8. If in doubt re-
garding correct ventilation, refer to professional,
qualied sta.
2.3 GENERAL WARNINGS.
Never expose the suspended boiler to direct
vapours from a cooking surface.
Use of the boiler by unskilled persons or children
is strictly prohibited.
If temporary shutdown of the boiler is required,
proceed as follows:
a) drain the heating system if anti-freeze is not
used;
b) shut-o all electrical, water and gas supplies.
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 and dangerous to obstruct the air
intake, even partially, for the ventilation of the
room in which the boiler is installed.
Due to the danger, functioning is also prohibited
in the same room as suction devices, chimneys
or similar at the same time as the boiler unless
there are additional openings dimensioned in a
way to satisfy the further necessity for air. For the
dimensioning of these additional openings, refer
to qualied technical sta. In particular, an open
re must have its own air supply.
On the contrary, the boiler cannot be installed
in the same room.
• Important: the use of components involving
use of electrical power requires some funda-
mental rules to be observed:
- do not touch the appliance with wet or moist
parts of the body; do not touch when barefo-
ot;
- never pull electrical cables or leave the ap-
pliance exposed to atmospheric agents (rain,
sunlight, etc.);
- the appliance power cable must not be repla-
ced by the user;
- in the event of damage to the cable, switch
off the appliance and contact exclusively
qualied sta for replacement;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.
N.B.: the temperatures indicated by the display
have a tolerance of +/- 3°C due to environmental
conditions that cannot be blamed on the boiler.
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.

11
INSTALLERUSER
MAINTENANCE TECHNICIAN
Ignition of the boiler (Fig. 2-1).Before ignition
make sure the heating system is lled with water
and that the manometer (7) indicates a pressure
of 1 ÷ 1.2 bar.
- Open the gas cock upstream from the boiler.
- Press key (2) and select the summer position
or winter ( ) position of the boiler ( ).
When in summer position ( ) the domestic hot
water temperature is regulated by keys (3-4).
When in winter position ( ) the system water
temperature is regulated by keys (5-6) whilst the
regulation of the domestic hot water temperature
is regulated using keys (3-4), pressing (+) to
increase and (-) to reduce.
From this moment the boiler functions auto-
matically. With no demand for heat (heating or
domestic hot water production) the boiler goes
to “standby” function, equivalent to the boiler
being powered without presence of ame. Each
time the boiler ignites, the relative ame present
symbol is displayed (15).
2.5 FAULTS AND ANOMALY SIGNALS.
e boiler signals out anomalies by ashing on
the display and relative error codes, listed on the
table, are displayed.
Code
displayed
(ashing) Anomaly signalled Cause Boiler status / Solution
01 No ignition block:
In the event of request of room central heating or domestic hot
water production, the boiler does not switch on within the preset
time. Upon appliance commissioning or aer extended downtime,
it may be necessary to eliminate the block.
Press the Reset button (1)
02 Safety thermostat block
(over-temperature)
During normal operation, if a fault causes excessive overheating
internally, the boiler goes into overheating block.
Aer an appropriate cooling press the
Reset button (1)
03 Flue safety thermostat
block
During normal operation, if a fault causes excessive ue gas overhe-
ating, the boiler blocks
Aer an appropriate cooling press the
Reset button (1)
e boiler will automatically restart aer
30 minutes if normal conditions resume
without having to be reset. Aer three
trippings of the ue safety thermostat in
less than two hours the boiler requires a
manual reset to restart; press the Reset
button (1)
04 Contacts resistance
block
e P.C.B. detects a malfunction of the safety thermostat, of the ue
pressure switch or of the system pressure switch. Press the Reset button (1)
05 Flow probe anomaly e board detects an anomaly on the ow NTC probe. e boiler does not start (1)
06 Domestic hot water
probe anomaly
e board detects an anomaly on the domestic hot water NTC probe.
In this case the antifreeze function is also inhibited
e boiler does not produce domestic hot
water (1)
10 Insucient system
pressure
Insucient water pressure inside the central heating circuit is detected
to guarantee correct boiler operation.
Check on the boiler pressure gauge (1) that
the system pressure is between 1÷1.2 bar
and restore the correct pressure if necessary
20 Parasite ame block is occurs in the event of a leak on the detection circuit or anomaly
in the ame control unit. Press the Reset button (1)
27 Insucient water cir-
culation
is occurs if there is overheating in the boiler due to insucient water
circulating in the primary circuit; the causes can be:
- system low circulation;
- locked circulating pump
- check that no shuto devices are closed on
the heating circuit and that the system is
free of air (deaerated);
- free the circulating pump.
(1)
28 Domestic hot water
leakagee
If during the heating phase, a rise in domestic hot water temperature
occurs, an anomaly is signalled and heating temperature is reduced
to limit the formation of limescale in the heat exchanger.
Check that all domestic hot water system
cocks are closed and are not drawing and
check also that there are no leaks in the
system. Once good conditions are restored
in the domestic hot water system, the boiler
returns to normal functioning (1)
31 Communication loss
with Mini CRD
This occurs if an incompatible remote control is connected, or
in case of loss of communication between boiler and Mini CRD.
Disconnect and reconnect the power to
the boiler. If the Remote Control is still
not detected on re-starting the boiler will
switch to local operating mode, i.e. using the
controls on the control panel. In this case
the “Heating” (1) mode cannot be activated.
(1) If the shutdown or fault persists, contact an authorised company (e.g. Technical After-Sales Service).

12
2-2
INSTALLERUSER
MAINTENANCE TECHNICIAN
Key:
1 - Filling valve
2 - Draining valve
2.6 BOILER SHUTDOWN.
Press key (2 g. 2-1) ( ) until the following
symbol appears ( ).
N.B.: in these conditions the boiler is considered
still live.
Important: if the boiler is in stand-by “ ” code
error “31E” will be displayed on the Mini CRD.
e remote control is powered constantly so as
not to loose the memorised programs.
Disconnect the external omnipolar boiler switch
and close the gas cock upstream of the appliance.
Never leave the boiler switched on if le unused
for prolonged periods.
2.7 RESTORE HEATING SYSTEM
PRESSURE.
Periodically check the system water pressure.
e boiler pressure gauge should read a pressure
between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool)
restore normal pressure via the cock located in the
lower part of the boiler (Fig. 2-2).
N.B.: close the cock aer the operation. If pres-
sure values reach around 3 bar the safety valve
may be activated.
In this case, remove water from an air vent valve
of a radiator until 1 bar is reached or ask for
assistance from an authorised company.
In the event of frequent pressure drops, contact
qualied sta for assistance to eliminate possible
system leakage.
2.8 SYSTEM DRAINING.
To drain the boiler, act on the special draining
valve (Fig. 2-2 e 1-8).
Before draining, ensure that the lling valve is
closed.
2.9 ANTIFREEZE PROTECTION.
e boiler is supplied with an antifreeze function
as per standard that activates the function of the
pump and the burner when the internal system
water temperature in the boiler falls below 4°C
and stops when it exceeds 42°C. e antifreeze
function is guaranteed if the boiler is fully ope-
rative, is not in “block” status and is electrically
powered. To avoid keeping the system switched
on in case of a prolonged absence, the system
must be drained completely or antifreeze sub-
stances must be added to the heating system
water. In both cases the boiler domestic hot
water circuit must be drained. In systems that
are drained frequently, lling must be carried out
with suitably treated water to eliminate hardness
that can cause lime-scale.
2.10 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.11 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact professional sta for the procedures and
ensure that the electrical, water and gas supply
lines are shut o and disconnected.
BOTTOM VIEW

13
3-1
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.1 HYDRAULIC LAYOUT.
Key:
1 - Domestic hot water probe
2 - Domestic hot water ow switch
3 - Gas valve
4 - Flow limiter
5 - System draining valve
6 - Burner
7 - Rapid heat exchanger
8 - Fumes hood
9 - Flue safety thermostat
10 - System expansion vessel
11 - Delivery probe
12 - Safety thermostat
13 - Vent valve
14 - Boiler pump
15 - System pressure switch
16 - By-pass
17 - 3 bar safety valve
18 - System lling valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
R - System return
M - System delivery
3BOILER STARTUP. INITIAL CHECK
To commission the boiler:
- ensure that the type of gas used corresponds to
boiler settings;
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
- switch the boiler on and ensure correct ignition;
- make sure the gas maximum, intermediate
and minimum ow rate and pressure values
correspond to those given in the handbook
par. 3.17;
- check activation of the safety device in the event
of no gas, as well as the relative activation time;
- check activation of the main switch located
upstream from the boiler;
- 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 functio-
ning of fans;
- ensure activation of all adjustment devices;
- seal the gas ow rate regulation devices (if
settings are modied);
- check the production of domestic hot water;
- check sealing eciency of water circuits;
- check ventilation and/or aeration of the instal-
lation room where provided.
If even only one control inherent to safety gives a
negative result, do not start the system.

14
3-2
6
1
3
2
7
6
5
4
5
5 6
10
9
9
8
8
8
10
10
8
9
11
11
9
10
INSTALLERUSER
MAINTENANCE TECHNICIAN
Key:
B1 - Delivery probe
B2 - Domestic hot water probe
CRD - Digital Mini Remote Control (optional)
DS1 - Display
E3 - Ignition and detection electrodes
E4 - Safety thermostat
E6 - Flue safety thermostat
F1 - Phase fuse
3.2 WIRING DIAGRAM.
F2 - Neutral fuse
M1 - Boiler circulating pump
S2 - Selector switch functioning
S3 - Reset block keys
S4 - Domestic hot water ow switch
S5 - System pressure switch
S20 - Room thermostat (optional)
S21 - Domestic hot water temperature
increase key
S22 - Domestic hot water temperature
reduce key
S23 - Heating temperature increase key
S24 - Heating temperature reduce key
T1 - Switch-on transformer
T2 - Boiler board transformer
U1 - Rectier inside the gas valve
connector (Only available on
Honeywell gas valves)
X40 - Room thermostat jumper
Y1 - Gas valve
Y2 - Gas valve modulator
1 - User interface
2 - N.B.: e user interface is on the
welding side of the boiler board
3 - e X6 connector is used for
automatic inspection
4 - 230 Vac 50Hz power supply
5 - Blue
6 - Brown
7 - Yellow/Green
8 - Black
9 - Grey
10 - White
11 - Red
e boiler is designed for application of a room
thermostat (S20), an On/Off room chrono-
thermostat, a program timer or a Digital Mini
Remote Control (CRD). Connect it to clamps
40 –41 eliminating jumper X40.
3.3 TROUBLESHOOTING.
N.B.: Maintenance must be carried out by a
qualied company (e.g. Technical Aer-Sales
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 boiler lamellar
pack is blocked. Clean the burner or the boiler
lamellar pack.
- Frequent activation of the temperature over-
load thermostat. It can depend on the lack of
water in the boiler, little water circulation in
the system or blocked pump. Check on the
manometer that the system pressure is within
established limits. Check that the radiator val-
ves are not closed and also the functionality of
the pump.
- e boiler produces condensate. is can be
caused by obstructions of the chimney or ues
with height or section not proportioned to the
boiler. It can also be determined by functioning
at boiler temperatures that are excessively low.
In this case, make the boiler run at higher
temperatures.
- Frequent interventions of the chimney safety
thermostat. is can be caused by obstructions
in the fumes circuit. Check the ue. e ue
may be obstructed or by height or section
not suitable for the boiler. Ventilation may be
insucient (see room ventilation point).
- Presence of air in the system. Check opening
of the special automatic vent valve (Fig. 1-6).
Make sure the system pressure and expansion
vessel pre-charge values are within the set
limits; the pre-charge value for the expansion
vessel must be 1.0 bar, and system pressure
between 1 and 1.2 bar.
- Ignition block and Chimney block. (See par.
2.5 and 1.5 (electric connection).
- Low water ow: if, as a result of limescale (cal-
cium and magnesium), the domestic hot water
system does not work properly contact a qua-
lied technician for descaling e.g. Immergas
Aer-Sales Technical Service. Descaling must
be carried out on the domestic hot water side
of the bithermal heat exchanger in accordance
with good practice. To preserve integrity and
eciency of the heat exchanger, a non corro-
sive descaler must be used. Cleaning must be
carried out without the use of tools which can
damage the heat exchanger.
3.4 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
If the boiler has to be converted to a dierent gas
type to that specied on the data plate, request
the relative conversion kit for quick and easy
conversion.
Boiler conversion must be carried out by a
qualied company (e.g. Aer-Sales Technical
Assistance Service).
To convert to another type of gas the following
operations are required:
- remove the voltage from the appliance;
- replace the main burner injectors, making sure
to insert the special seal rings supplied in the
kit, between the gas manifold and the injectors;
- apply voltage to the appliance;
- select using the boiler key, the gas parameter
type (P1) and select (nG) in case of Methane
supply or (LG) in the case of LPG
select gas parameter type (P2) in the case of
G110 gas supply;
- adjust the boiler nominal heat output;
- adjust the boiler nominal heat output in dome-
stic hot water phase;
- adjust the boiler nominal heat output in heating
phase;
- adjust (if necessary) the boiler maximum heat
output in heating phase;
- seal the gas ow rate regulation devices (if
settings are modied);
- aer completing conversion, apply the sticker,
present in the conversion kit, near to the data-
plate. Using an indelible marker pen, cancel the
data relative to the old type of gas.
ese adjustments must be made with reference
to the type of gas used, following that given in
the table (parag. 3.17).

15
3-3
43
2
1
56
4
3
2
1
6
5
INSTALLERUSER
MAINTENANCE TECHNICIAN
SIT 845 GAS valve
Key:
1 - Coil
2 - Minimum power adjustment
nut
3 - Maximum power adjustment
nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection hood
VK 4105 M GAS valve
3.5 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
Aer making sure that conversion was carried
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that:
- there is no ame in the combustion chamber;
- the burner ame is not too high or low and that
it is stable (does not detach from burner);
- the pressure testers used for calibration are
perfectly closed and there are no leaks from
the gas circuit.
N.B.: all boiler adjustment operations must be
carried out by a qualied company (e.g. Aer-
Sales Technical Assistance). Burner adjustment
must be carried out using a dierential “U” or
digital type manometer connected to the gas
valve outlet pressure point (part. 4 g. 3-3),
keeping to the pressure value given in the table
(par. 3.17) according to the type of gas for which
the boiler is prepared.
3.6 POSSIBLE ADJUSTMENTS.
• Adjustment of boiler nominal thermal heat
output.
- Press the (+) key to adjust the domestic hot water
temperature (3 g. 2-1) up to the maximum
functioning temperature.
- Open the domestic hot water cock in order to
prevent modulation intervention.
- Adjust the boiler nominal power on the brass nut
(3 Fig. 3.3), keeping to the maximum pressure
values stated in the tables (Par. 3.17) depending
on the type of gas.
- By turning in a clockwise direction the heating
potential increases and in an anti-clockwise
direction it decreases.
• Adjust the boiler minimum heat input in the
domestic hot water phase (Fig. 3-3).
N.B.: only proceed aer having calibrated the
nominal pressure.
To adjust the minimum thermal output in do-
mestic hot water phase, turn the nut (2) located
on the gas valve blocking the brass nut (3);
- disconnect the power supply to the modulating
coil (just disconnect a faston); by turning the
screw in a clockwise direction, the pressure
increases, in an anti-clockwise direction it de-
creases. On completion of calibration, re-apply
the power supply to the modulating coil. e
pressure to which the boiler minimum power
must be adjusted, must not be lower than that
stated in the tables (par. 3.17) depending on the
type of gas.
N.B.: to adjust the gas valve, remove the plastic
cap (6); aer adjusting, ret the cap.
• Adjustment of the boiler minimum heat output
in heating phase.
N.B.: only proceed aer having calibrated the
minimum domestic hot water pressure.
To adjust the minimum heat output during the
heating phase, change parameter (5), increasing
the value the pressure increases, reducing it the
pressure drops.
- e pressure to which the boiler minimum heat
output must be adjusted, must not be lower than
that stated in the tables (parag. 3.17).
3.7 PROGRAMMING THE P.C.B.
e Nike Star 24 4 ErP boiler is prepared for
possible programming of several functioning
parameters. By modifying these parameters as de-
scribed below, the boiler can be adapted according
to specic needs.
To access the programming phase (Fig. 2-1),
proceed as follows:
- press keys (1) and (2) at the same time for
approximately 15 seconds;
- Using keys (3) and (4), select the parameter to
be changed indicated in the following table:
List of
parame-
ters
Description
P0 Select solar panels
P1 Select gas type
P2 Select special G110 gas
P3 Activate anti-extruder function
P4 Activate domestic hot water post
circulation
P5 Minimum heat output
P6 Maximum heat output
P7 Heating ignitions timer
P8 Heating ramp timer
- adjust the corresponding value consulting the
table using keys (5) and (6);
- conrm the set value pressing the reset key
(1) for approximately 5 seconds; pressing keys
(3) + and (4) - at the same time to adjust the
domestic hot water temperature, the operation
is cancelled.
N.B.: aer a period of time, without touching
any keys, the operation cancels automatically.
Select solar panels By selecting this function,
the boiler is set to be used with solar panels. By
setting the parameter P0 in “solar”on mode, the
switching o of the burner is correlated to the
adjustment of the domestic hot water tempera-
ture. In OFF mode, the burner is switched o at
the maximum value.
N.B.: together with a solar valve kit, set the
parameter P0 in “solar”on mode (correlated).
Select solar panels
Range of values which can be set Parame-
ter
on "solar" - oF (Standard settings) P0
Select gas type e setting of this function is used
to adjust the boiler in order to function with LPG
gas or Methane gas.
Select gas type
Range of values which can be set Parame-
ter
LG (LPG) o nG (Methane) (Stan-
dard setting) P1
Town Gas G110 – Industrial gas. e setting of
this function is used to adjust the boiler in order
to function with gases from the rst family.
Town Gas G110 - Industrial gas (rst family
gas)
Range of values which can be set Parame-
ter
on - oF (Standard setting) P2

16
INSTALLERUSER
MAINTENANCE TECHNICIAN
Anti-Extruder function. is function reduces
the heating temperature to 57°C in the case that
domestic hot water circulation is detected in the
heating mode.
Activate anti-extruder function
Range of values which can be set Parame-
ter
on (Standard setting) - oF P3
Domestic hot water post circulation function
With the post circulation function active after
domestic hot water ow, the pump remains on
for 2.5 seconds in winter time and 1.5 seconds in
summer time to reduce the formation of limescale.
Activate domestic hot water post circula-
tion
Range of values which can be set Parame-
ter
on (Standard setting) - oF P4
Heating power.e Nike Star 24 4 ErP boiler
is tted with an electronic modulation which
adapts the power of the boiler to eective heat
requests of the home. en the boiler works
normally in a variable gas pressure eld between
the minimum heating power and the maximum
heating power depending on the system’s hea-
ting load.
N.B.:e Nike Star 24 4 ErP boiler is produced
and calibrated in the heating phase to the nomi-
nal heat output. Approximately 10 minutes are
needed to reach the nominal heat output, which
can be changed using the parameter (P6).
N.B: the selection of the “Minimum heat output”
and “Maximum heat output” parameters, in the
presence of a heating request, allows switch-on
of the boiler and power supply of the modulator
with current equal to the value of the respective
set value.
Minimum heat output
Range of values which can be set Parame-
ter
from 0% Imax. to 63 % Imax. P5
Maximum heat output
Range of values which can be set Parame-
ter
from 0% Imax. to 99 % Imax.
(Standard setting) P6
Timer setting. The boiler has an electronic
timing device that prevents the burner from
igniting too oen in the heating phase. e boiler
is supplied as per standard with a timer adjusted
at 3 minutes.
Heating ignitions timer
Range of values which can be set Parame-
ter
from1to10
1 = 30 seconds
2 = 2 minutes
3 = 3 minutes (Standard setting)
P7
Heating ramp timing. e boiler performs an
ignition ramp of about 10 minutes to arrive from
minimum power to nominal heating power.
Heating ramp timer
Range of values which can be set Parame-
ter
from1to10
1 = 30 seconds
2 = 2 minutes
10 = 10 minutes (Standard setting)
P8
3.8 AUTOMATIC SLOW IGNITION
FUNCTION WITH TIMED RAMP
DELIVERY.
In the ignition phase the P.C.B. carries out an
increasing gas delivery ramp (with pressure va-
lues that depend on the type of gas selected) with
preset duration. is prevents every calibration
or precision adjustment of the boiler ignition
phase in any conditions of use.
3.9 “CHIMNEY SWEEP FUNCTION”.
When activated, this function forces the boiler
at max. output for 15 minutes.
In this state all adjustments are excluded and
only the temperature safety thermostat and the
limit thermostat remain active. To activate the
chimney sweep function, press the Reset key for
at least 10 seconds with the boiler on stand-by. Its
activation is indicated by the ashing symbols (8
and 11 g. 2-1). is function allows the techni-
cian to check the combustion parameters. Aer
the checks, deactivate the function switching the
boiler o and then on again.
3.10 HEATING TIMER.
e Nike Star 24 4 ErP boiler has an electronic
timing device that prevents the burner from
igniting too oen in the heating phase. e boiler
is supplied as per standard with a timer adjusted
at 3 minutes. To adjust the timer values, follow
instructions for parameter settings by selecting
parameter (P7) and set it with one of the values
indicated on the relative table.
3.11 PUMP ANTIBLOCK FUNCTION.
In summer functioning mode ( ) the boiler
has a function that starts the pump at least once
every 24 hours for the duration of 30 seconds in
order to reduce the risk of the pump becoming
blocked due to prolonged inactivity.
In winter functioning mode ( ) the boiler has a
function that makes the pump start at least once
every 3 hours for 30 seconds.
3.12 DOMESTIC HOT WATER CIRCUIT
ANTIEXTRUDER FUNCTION.
is function reduces the heating temperature
to 57°C if the domestic hot water circulation is
detected in the heating mode. e function can
be excluded using parameter (P3).
3.13 RADIATORS ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.14 P.C.B. PERIODICAL SELFCHECK.
During functioning in heating mode or with
boiler in standby, the function activates every 18
hours aer the last boiler check/power supply. In
case of functioning in domestic hot water mode
the self-check starts within 10 minutes aer the
end of the withdrawing in progress, for duration
of approx. 10 seconds.
N.B.: during self-check, the boiler remains o,
including signalling.

17
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.15 CASING REMOVAL.
To facilitate boiler maintenance the casing can be
completely removed as follows (Fig. 3-4):
- Remove frame (1) grasping the edges and pul-
ling towards oneself as indicated by the arrow.
- Loosen the 2 front screws (2) and the 2 screw
fasteners (3) below on the casing o (4).
- Pull the casing (4) towards yourself and
upwards at the same time in order to detach it
from the upper hooks.
3.16 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 fume hood for deterioration
or corrosion.
- Check correct lighting and functioning.
- Check correct calibration of the burner in
domestic hot water and heating phases.
- Check correct functioning of control and
adjustment devices and in particular:
- the intervention of main electrical switch
positioned outside of the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat inter-
vention.
- Check that the internal system is properly
sealed according to specications.
- Check the intervention of the device against no
gas ionization ame control. Intervention time
must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, aer discharging system pressure
and bringing it to zero (read on boiler mano-
meter), the expansion vessel load is at 1.0 bar.
- Check that the system static pressure (with
system cold and aer relling the system by
means of the lling valve) is between 1 and 1.2
bar.
- Check visually that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- water pressure switch;
- ue exhaust control thermostat.
- Check the condition and integrity of the elec-
trical system and in particular:
- electrical power cables must be inside the
whipping;
- there must be no traces of blackening or
burning.
N.B.: in addition to yearly maintenance, the ther-
mal system must also be checked, with frequency
and procedures that comply with the provisions
of the technical regulations in force.

18
3-4
3
2
2
4
1
INSTALLERUSER
MAINTENANCE TECHNICIAN

19
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.17 VARIABLE HEAT POWER.
N.B.: Gas ow rates refer to heating power be-
low a temperature of 15°C and at a pressure of
1013 mbar. Burner pressure values refer to use
of gas at 15°C.
3.18 COMBUSTION PARAMETERS.
G20 G30 G31
Gas nozzle diameter mm 1,30 0,80 0,80
supply pressure mbar (mm H2O) 20 (204) 29 (296) 37 (377)
Mass ow of fumes at nominal power kg/h 68 65 69
Mass ow of fumes at min. power kg/h 60 60 69
CO2at Q. Nom./Min. % 5,35 / 1,80 6,50 / 2,10 6,10 / 1,80
CO at 0% di O2at Q. Nom./Min. ppm 79 / 86 151 / 100 95 / 137
NOXat 0% di O2at Q. Nom./Min. ppm 58 / 12 110 / 15 97 / 12
Temperature of fumes at nominal output °C 101 106 102
Temperature of fumes at minimum output °C 85 85 76
METHANE (G20) BUTANE (G30) PROPANE (G31)
HEATING
POWER
HEATING
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)
23,6 20296 MAX. 2,74 14,00 142,8 2,05 28,00 285,5 2,01 35,60 363,0
9,5 8170 MIN CEN.
HEAT. 1,14 2,77 28,3 0,85 5,00 51,0 0,84 6,43 65,5
7,0 6020 MIN
D.H.W. 0,86 1,70 17,3 0,64 3,00 30,6 0,63 3,00 30,6

20
INSTALLERUSER
MAINTENANCE TECHNICIAN
Nominal heat input kW (kcal/h) 25,9 (22279)
DHW minimum heat input kW (kcal/h) 8,1 (6968)
CH minimum heat input kW (kcal/h) 10,8 (9300)
Nominal heat output (useful) kW (kcal/h) 23,6 (20296)
DHW minimum heat output (useful) kW (kcal/h) 7,0 (6020)
CH minimum heat output (useful) kW (kcal/h) 9,5 (8170)
* Eciency at 100% heat output % 91,1
* Eciency at 30% nominal heat output load % 86,6
Heat loss at case with burner On/O % 2,10 / 1,05
Heat loss at ue with burner On/O % 6,80 / 0,47
Heating circuit max. working pressure bar 3
Heating circuit max. working temperature °C 90
Adjustable heating temperature °C 35 - 80
Total volume system heating expansion vessel l 4,2
Expansion vessel pre-charge bar 1
Generator water capacity l 0,7
Total head available with 1000 l/h ow rate kPa (m H2O) 30,92 (3,20)
Hot water production useful heat output kW (kcal/h) 23,6 (20296)
Domestic hot water adjustable temperature °C 35 - 55
Min. pressure (dynamic) domestic hot water circuit bar 0,3
Domestic hot water circuit max. working pressure bar 10
Minimum D.H.W. ow rate l/min 2,0
Continuous ow rate (∆T 30°C) l/min 11,1
Weight of full boiler kg 25,3
Weight of empty boiler kg 24,6
Electric attachment V/Hz 230/50
Nominal absorption A 0,3
Installed electric power W 30
Power absorbed by circulation pump W 21
Value EEI - ≤ 0,20 - Part. 3
Equipment electrical system protection - IPX4D
Boiler ue circuit resistance Pa 1,3
NOXclass - 2
Weighted NOXmg/kWh 154
Weighted CO mg/kWh 33
Type of appliance B11BS
Category II2H3+
- Fume 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 boiler outlet
considering that to obtain the data declared
mixing with cold water is necessary.
- * Eciencies refer to the lower heating value
3.19 TECHNICAL DATA.