Immergas NIKE STAR 24 Product manual

NIKE STAR 24
Instantaneously wall-hung boilers
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.
IE
Instructions and
warning book
Installer
User
Maintenance technician
*1.040577ENG*

e manufacturer declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without 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 boiler. Read the following pages carefully:
you will be able to draw useful suggestions regarding the correct use of the appliance. By respecting these suggestions, you will no doubt be satised with your
Immergas product.
For any assistance and scheduled maintenance please contact Authorised Aer-Sales centres: they have original spare parts and are specically trained by the
manufacturer.
General recommendations
All Immergas products are protected with suitable transport packaging.
e material must be stored in a dry place protected from the weather.
e instruction book is an integral and essential part of the product and must also be given to the new user in the case of transfer or succession of ownership.
It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation, use and maintenance stages.
is instructions manual provides technical information for installing Immergas 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
technique.
In compliance with the 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 an agreed
company, intended as a company with specic technical skills in the system sector, as envisioned by the Law.
Improper installation or assembly of the appliance and/or Immergas components, accessories, kit and devices can cause unexpected problems to people, animals
and objects. Read the instructions provided with the product carefully to ensure proper installation.
Maintenance must be carried out by an authorised company. e 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.
For further details on the product CE marking, request a copy of the Declaration of Conformity from the manufacturer, specifying the appliance model
and the language of the country.

INDEX
USER pageINSTALLER page MAINTENANCE TECHNICIAN page
1 Installation boiler........................................5
1.1 Installation recommendations..................5
1.2 Main dimensions. .......................................6
1.3 Antifreeze protection. ................................6
1.4 Boiler connection unit. ..............................6
1.5 Gas connection. ..........................................6
1.6 Hydraulic connection.................................7
1.7 Electrical connection..................................7
1.8 Remote controls and room chrono-
thermostats (Optional). .............................7
1.9 Ventilation of the rooms............................8
1.10Evacuation of combustion products:
smoke ducts and branched
multiple ues...............................................8
1.11Flue gas control device............................... 8
1.12System lling. ..............................................8
1.13Gas system start-up. ...................................8
1.14Boiler start up (ignition)............................8
1.15Circulation pump........................................9
1.16Boiler components....................................11
1.17Kits available on request. .........................11
2 Use and maintenance instructions.........12
2.1 Cleaning and maintenance......................12
2.2 Ventilation of the rooms..........................12
2.3 General warnings......................................12
2.4 Control panel.............................................12
2.5 Fault and anomaly signals. ......................13
2.6 Information Menu....................................14
2.7 Boiler shutdown........................................15
2.8 Restore central heating system
pressure ......................................................15
2.9 Draining the system. ................................15
2.10Antifreeze protection. ..............................15
2.11Case cleaning.............................................15
2.12Decommissioning.....................................15
3 Commissioning the boiler
(initial check). ...........................................16
3.1 Hydraulic Diagram...................................16
3.2 Wiring diagram.........................................17
3.3 Troubleshooting........................................18
3.4 Converting the boiler to other types
of gas...........................................................19
3.5 Checks following conversion to another
type of gas. .................................................19
3.6 Possible adjustments. ...............................19
3.7 Programming the P.C.B. ..........................20
3.8 Automatic slow ignition function with
timed ramp delivery. ................................21
3.9 "Chimney sweep” function......................21
3.10Heating Timer...........................................21
3.11Pump anti-block function. ......................21
3.12Domestic hot water circuit
anti-extruder function. ............................21
3.13Radiators antifreeze function..................21
3.14P.C.B. periodical self-check. ....................21
3.15Casing removal. ........................................22
3.16Yearly appliance check and
maintenance. .............................................23
3.17Variable heat output. ................................23
3.18Combustion parameters. .........................24
3.19Technical data. ..........................................24
3.20Key for Data nameplate. ..........................25
3.21Technical parameters for combination
boilers (in compliance with Regulation
813/2013)...................................................26
3.22Product che (in compliance with
Regulation 811/2013)...............................26
3.23Parameters for lling the
package che. ............................................27

5
1
INSTALLERUSER
MAINTENANCE TECHNICIAN
1INSTALLATION BOILER
1.1 INSTALLATION
RECOMMENDATIONS.
e Nike Star 24 boiler has been designed for wall
mounted installation only, for heating environ-
ments and production of domestic hot water for
domestic use and similar purposes.
e place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural), such as to al-
low for (always in safe, ecient and comfortable
conditions):
- installation (according to the provisions of
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (to outdoors in the place for loading
and transporting the appliances and com-
ponents) as well as the eventual replacement
of those with appliances and/or equivalent
components.
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).
Only a professionally enabled company is
authorised to install Immergas gas appliances.
Installation must be carried out according to
regulation standards, current legislation and in
compliance with local technical regulations and
the required technical procedures.
Attention: the manufacturer declines all liability
for damages caused by boilers removed from
other systems or for any non-conformities of
such equipment.
Installation of the Nike star 24 boiler when
powered by LPG or propane air must comply
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 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 in-
side 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 ue removal connections. It is just as impor-
tant 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 draining
funnel), or if there are leaks from the hydraulic
connections; otherwise, 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 and contact an
authorised company (e.g. the Authorised Tech-
nical Assistance centre, which has specically
trained sta and original spare parts). Do not
attempt to modify or repair the appliance alone.
Failure to comply with the above implies personal
responsibility and invalidates the warranty.
• Installation Standards:
- 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 in places with a re risk is pro-
hibited (for example: underground car parks,
garages), potentially dangerous places, gas
appliances and relative ue ducts.
- Installation is prohibited on the vertical
projection of the cooking surface.
- Installation is forbidden in places/rooms
that constitute public areas of apartment
buildings, internal stairways or other escape
routes (e.g. landings, entrance halls, etc.) un-
less otherwise provided by local regulations.
- Installation is also forbidden in places/rooms
that constitute public areas of apartment
buildings such as cellars, entrance halls, attics,
los, etc., unless otherwise provided for by
local regulations in force.
- 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 dam-
aging for the components of the appliance
and jeopardise functioning.
- ey must also be installed in an environment
in which the temperature cannot fall below
0°C. ey must not be exposed to atmospher-
ic agents.
- 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.
- For the right functioning of the Nike Star, the pipe
the boiler is connected to is to have a minimum
vacuum equivalent to the fan assisted of 1 meter
of vertical pipe with a diameter of 130 mm.
Attention: wall mounting of the boiler must
guarantee stable and ecient support for the
generator.
e plugs (standard supply) are to be used only
in conjunction with the xing template to x the
boiler to the wall; they only ensure adequate sup-
port if inserted correctly (according to technical
standards) in walls made of solid or semi-hollow
brick or block. In the case of walls made from
hollow brick or block, partitions with limited
static properties, or in any case walls other than
those indicated, a static test must be carried out
to ensure adequate mount.
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 central heating
system and domestic hot water circuit suited to
their performance and capacity.
YES NO

6
2
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.2 MAIN DIMENSIONS.
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Solar valve kit DHW inlet (Optional)
AF - Domestic cold water inlet
R - System return
M - System ow
V - Electrical connection
VS - Safety valve drain
Height
(mm) Width (mm) Depth (mm)
781 440 240
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
N.B.: connection group (Optional)
1.3 ANTIFREEZE PROTECTION.
Minimum temperature -5°C. e boiler comes
standard with an antifreeze function that ac-
tivates the pump and burner when the system
water temperature in the boiler falls below 4°C.
e antifreeze function is only guaranteed if:
- the boiler is correctly connected to gas and
electricity power supply circuits;
- the boiler is powered constantly;
- the boiler is not in ignition failure block (Par.
2.3);
- the boiler essential components are not faulty.
In these conditions the boiler is protected against
freezing to an ambient temperature of -5°C.
Minimum temperature -15°C. If the boiler is
installed in a place where the temperature falls
below -5°C and in the event there is no gas or
the boiler goes into failed ignition block, the
appliance can freeze.
To prevent the risk of freezing follow the instruc-
tions below:
- protect the central heating circuit from freezing
by inserting a good-quality antifreeze liquid
into this circuit, which is specially suited for
central heating systems and which is manu-
facturer guaranteed not to cause damage to
the heat exchanger or other components of
the boiler. e antifreeze liquid must not be
harmful to one's health. e instructions of the
manufacturer of this liquid must be followed
scrupulously regarding the percentage neces-
sary with respect to the minimum temperature
at which the system must be kept.
Warning: the excessive use of glycol could jeop-
ardise the proper functioning of the appliance.
An aqueous solution must be made with potential
pollution class of water 2 (EN 1717:2002 or local
standards in force).
e materials used for the central heating circuit of
Immergas boilers withstand ethylene and propyl-
ene glycol based antifreeze liquids (if the mixtures
are prepared perfectly).
For life and possible disposal, follow the suppli-
er's instructions.
- Protect the domestic hot water circuit against
freezing by using an accessory that is supplied
on request (antifreeze kit) comprising two
electric heating elements, the relevant wiring
and a control thermostat (carefully read the
installation instructions contained in the ac-
cessory kit pack).
Boiler antifreeze protection is thus ensured only if:
- the boiler is correctly connected to gas and elec-
tricity power supply circuits and powered;
- the main switch is engaged;
- the anti-freezing kit components are ecient.
In these conditions the boiler is protected against
freezing to temperature of -15°C.
e warranty does not cover damage due to inter-
ruption of the electrical power supply and failure
to comply with that stated on the previous page.
NOTE: if the boiler is installed in places where
the temperature falls below 0°C the domestic
hot water and central heating attachment pipes
must be insulated.
1.4 BOILER CONNECTION UNIT.
e connection unit consisting of all the nec-
essary parts to perform the hydraulic and gas
system connections of the appliance comes as
optional.
1.5 GAS CONNECTION.
Our boilers are designed to operate with meth-
ane gas (G20) or 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
nameplate). If dierent, the boiler must be con-
verted for operation with the other type of gas
(see converting appliance for other gas types). It
is also important to check the dynamic pressure
of the mains (methane or LPG) used to supply
the boiler, which must comply with UNI EN 437
and its attachment, as insucient levels may
reduce generator output and cause discomfort
to the user.

7
4 5
CAVO ALIMENTAZIONE
3
INSTALLERUSER
MAINTENANCE TECHNICIAN
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 impurities;
otherwise it is advisable to fit special filters
upstream of the appliance to restore the purity
of the fuel.
Storage tanks (in case of supply from LPG
depot).
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance casing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.
1.6 HYDRAULIC CONNECTION.
Attention: Before making the boiler connections,
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 treatment of the heating and water 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. 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 valves outlet must be connected
to a draining funnel. Otherwise, the manufactur-
er declines any responsibility in case of ooding
if the drain valve cuts in.
Attention: the manufacturer declines all liability
in the event of damage caused by the installation
of an automatic lling system.
In order to meet the system requirements es-
tablished by the technical regulation in force
in relation to the pollution of drinking water,
we recommend installing the IMMERGAS an-
ti-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.
Attention: 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.
1.7 ELECTRICAL CONNECTION.
e Nike Star 24 boiler has an IPX4D protection
rating for the entire appliance. Electrical safety of
the appliance is reached only when it is correctly
connected to an efficient earthing system as
specied by current safety standards.
Attention: the manufacturer declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an
ecient earth system or failure to comply with
the reference standards.
Also ensure that the electrical installation cor-
responds to maximum absorbed power speci-
cations as shown on the boiler data nameplate.
Boilers are supplied complete with a “Y” type
power cable. e power supply 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 overvoltage category.
When replacing the power supply cable, contact
a qualied rm (e.g. the Authorised Aer-Sales
Technical Assistance Service). e power cable
must be laid as shown (Fig. 3). In the event of
mains fuse replacement on the P.C.B., use a 3.15
A quick-blow fuse. For the main power supply
to the appliance, never use adapters, multiple
sockets or extension leads.
1.8 REMOTE CONTROLS AND
ROOM CHRONOTHERMOSTATS
OPTIONAL.
e boiler is prepared for the application of room
chrono-thermostats or remote controls, which
are available as optional kits (Fig. 4 - 5).
All devices are connected with 2 wires only.
Carefully read the user and assembly instructions
contained in the accessory kit.
SUPPLY VOLTAGE CABLE
• On/O digital chrono-thermostat. e chro-
no-thermostat allows:
- set two room temperature value: one for day
(comfort temperature) and one for night
(reduced 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 mode (with adjustable temperature).
• automatic mode (with set programme).
•forced automatic mode (momentarily changing
the temperature of the automatic programme).
e chrono-thermostat is powered by two 1.5V
LR 6 type alkaline batteries.
• Digital Remote Mini-Control Device with
climate chrono-thermostat and CARV2 func-
tion. In addition to the functions described in
the previous point, the Mini-DRC and CARV2
panels enable the user to control all the impor-
tant information regarding operation of the
appliance and the central 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 and CARV2 panels are equipped with
self-diagnosis to display any boiler functioning
anomalies. e climate regulator incorporated
into the remote panels enables the system ow
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 Mini CRD and CARV2
are fed directly by the boiler by means of the
same 2 wires used for the transmission of data
between the boiler and devices.
Digital Remote Mini-Control or CARV2 or On/
O chrono-thermostat electrical connections
(Optional). e operations described below must
be performed aer having removed the voltage
from the appliance. Any room chrono-thermo-
stats or remote controls must be connected to
the 40 and 41 terminal blocks, eliminating the
X40 jumper (Fig. 3-2). Make sure that the On/
O thermostat contact is of the “clean” type, i.e.
independent of the mains voltage, otherwise the
P.C.B. would be damaged. e boiler can only be
connected to one device at a time.
Important: if the Mini CRD or CARV2 remote
control is used, arrange two separate lines in
compliance with current regulations regarding
electrical systems. No boiler pipes must ever be
used to earth the electric system or telephone
lines. Ensure elimination of this risk before
making the boiler electrical connections.

8
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.9 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 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 sourc-
es of pollution. Natural air ow is also allowed
indirectly by air intake from adjoining rooms.
For further information relative to ventilation 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.
1.10 EVACUATION OF COMBUSTION
PRODUCTS: SMOKE DUCTS AND
BRANCHED MULTIPLE FLUES.
e European regulation 813/2013 provides that
this boiler can be installed only to replace sim-
ilar 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.
1.11 FLUE GAS 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.
For the right functioning of the Nike Star, the
pipe the boiler is connected to is to have a mini-
mum vacuum equivalent to the fan assisted of 1
meter of vertical pipe with a diameter of 130 mm.
1.12 SYSTEM FILLING.
Once the boiler is connected, proceed with
system lling via the lling cock (Fig. 7 Fig.
9). Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler
and central heating system vents.
e boiler has a built-in automatic venting valve
on the circulator. Check if the cap is loose (Ref.
15 Fig.9 and Ref. 13 Fig. 12). Open the radiator
vent valves.
Close radiator vent valves when only water
escapes from them.
Close the lling valve when the boiler pressure
gauge indicates approx. 1.2 bar.
1.13 GAS SYSTEM STARTUP.
To start up the system, refer to the technical
standard in force: 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 technical regulations in
force;
1.14 BOILER START UP IGNITION.
To commission the boiler (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 technical regulations in
force;
- 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 (Par. 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 function-
ing 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 even if only
one of the checks should be negative.

9
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.15 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. 9).e boiler
leaves the factory with the bypass 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. Turning clockwise
opens the bypass and anticlockwise closes 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g-
uration ashing, each time the button is pressed
all possible functions are scrolled cyclically. 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.  - ):

10
6
7
8
INSTALLERUSER
MAINTENANCE TECHNICIAN
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)
Head available to the system.
Key:
Vn = Available head
An = 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)
V4
V4
V3
V3
V2
V2
A4
A4
A3
A3
A2
A2
Head and output with the by-pass closed
Head and output with the by-pass open

11
9
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.16 BOILER COMPONENTS.
Key:
1 - Flue hood
2 - System pressure switch
3 - Boiler pump
4 - D.H.W. probe
5 - Gas valve
6 - D.H.W. ow switch
7 - System lling valve
8 - Flue safety thermostat
9 - Flow probe
10 - Rapid heat exchanger
11 - Combustion chamber
12 - Ignition and detection electrodes
13 - System expansion vessel
14 - Burner
15 - Air vent valve
16 - Safety thermostat
17 - Manifold
18 - System draining valve
19 - By-pass
20 - 3 bar safety valve
PLEASE NOTE: connection group (optional)
1.17 KITS AVAILABLE ON REQUEST.
• System cut-o valves kit. e boiler is designed
for installation of system interception cocks
to be placed on ow and return pipes of the
connection assembly. is kit is particularly
useful for maintenance as it allows to drain just
the boiler without having to empty the entire
system.
• Polyphosphate dispenser kit. e polyphos-
phate dispenser reduces the formation of lime-
scale and preserves the original heat exchange
and domestic hot water production conditions.
e boiler is prepared for application of the
polyphosphate dispenser kit.
• Connection unit kit. It includes pipes, ttings
and cocks (including gas cock), to carry out all
connections to the boiler system.
• Anti freeze kit with resistance (on request). If
the boiler is installed in a place where the tem-
perature falls below -5°C and in the event there
is no gas, the appliance can freeze. To prevent
freezing of the domestic hot water system, an
anti freeze kit with an electrical resistance can
be tted from the relative cable and from a
control thermostat.
Kits are supplied complete with instructions for
their assembly and use.

12
10
INSTALLERUSER
MAINTENANCE TECHNICIAN
2USE AND MAINTENANCE INSTRUCTIONS.
2.1 CLEANING AND MAINTENANCE.
Attention: to preserve the boiler's integrity and
keep the safety features, performance and relia-
bility which distinguish it unchanged over time,
maintenance operations must be carried out on a
yearly basis in compliance with that stated in the
“annual check and maintenance of the appliance”
section, 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. 1.9, 1.10 and 1.11. If in
doubt regarding correct ventilation, contact a
qualied company.
2.3 GENERAL WARNINGS.
Never expose the wall-mounted 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cien-
cy 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, operation is also prohibited
in the same room as suction devices or the like,
at the same time as the boiler unless there are
additional openings dimensioned in a way to
satisfy the additional requirement for air. For the
dimensioning of these additional openings, refer
to an authorised company.
• Attention: using any components that use
electrical power requires some fundamental
rules to be observed:
- do not touch the appliance with wet or moist
parts of the body; do not touch when bare-
foot;
- never pull electrical cables or leave the ap-
pliance exposed to atmospheric agents (rain,
sunlight, etc.);
- the appliance power cable must not be re-
placed 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 attributed to 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.
2.4 CONTROL PANEL.
Key:
1 - Reset Button
2 - Stand-by/ summer/winter button
3 - Key (+) used to increase the
DHW temperature setting.
4 - Key (-) used to decrease the
DHW temperature setting.
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

13
INSTALLERUSER
MAINTENANCE TECHNICIAN
Boiler ignition (see Figure). 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 set the boiler on Summer ( )
or Winter ( ).
When in summer position ( ) the domestic
hot water temperature is adjusted with the
buttons (3-4).
When the winter position is selected ( ) the
system water temperature is adjusted with the
buttons (5-6), whilst the domestic hot water
temperature is adjusted using the buttons (3-4),
by pressing (+) to increase and (-) to reduce the
temperature.
From this moment the boiler functions automat-
ically. With no demand for heat (central 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 FAULT AND ANOMALY SIGNALS.
e boiler signals out anomalies by ashing on
the display and relative error codes, listed on the
table, are displayed.
Error
Code 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-temper-
ature)
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 overheat-
ing, the boiler blocks
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 and wait for
further 30 minutes. 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)
08 Maximum N° of resets Number of allowed resets already performed.
Attention: the anomaly can be reset
5 times consecutively, after which the
function in inhibited for at least one hour.
One attempt is gained every hour for a
maximum of 5 attempts. By switching the
appliance on and off the 5 attempts are
re-acquired.
10 Insucient system
pressure
Water pressure inside the central heating circuit that is sucient to
guarantee the correct operation of the boiler is not detected.
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)
24 Push button control
panel anomaly e board detects an anomaly on the pushbutton panel. If normal conditions are restored the boil- er restarts without having to be reset (1).
27 Insucient water
circulation.
is occurs if there is overheating in the boiler due to insucient water
circulating in the primary circuit; the causes can be:
- low circulation;
- circulator pump blocked.
- 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
leakage
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 Loss of remote control
communication.
This occurs if an incompatible remote control is connected, or if
communication between the boiler and the remote control is lost.
Disconnect and reconnect the power to the
boiler. If the Remote Control is not detect-
ed on re-starting the boiler will switch to
“Summer” local operating mode. In this
case, the controls on the control panel of
the boiler are enabled again (1).
36 IMG BUS communica-
tion loss Communication loss on the IMG BUS protocol e boiler does not satisfy the room heating requests (1).
37 Low power supply
voltage
This occurs when the power supply voltage is lower than the allowed
limits for the correct boiler operation.
If normal conditions are restored the boiler
restarts without having to be reset (1).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical Aer-Sales Service).

14
INSTALLERUSER
MAINTENANCE TECHNICIAN
Error
Code Anomaly signalled Cause Boiler status / Solution
38 Loss of ame signal
This occurs when the boiler is ignited correctly and the burner
flame switches off unexpectedly; a new attempt at ignition is
performed and if normal conditions are restored, the boiler does
not have to be reset.
(1).
43 Block due to loss of
ame signal
is occurs if the ''Flame signal loss (38)'' error occurs many times
in a row within a preset period. Press the Reset button (1).
44
Block for exceeding the
maximum openings
close to the gas valve
is occurs if the gas valve remains open for longer than required
for normal operation, without
the boiler switching on.
Press the Reset button (1).
59 Supply voltage fre-
quency anomaly e board detects a main supply voltage frequency anomaly. e boiler does not start (1).
80
Failure signalled of the
gas valve modulator
pilot circuit
Possible failure to the gas valve modulator or electronic board, cut-o
wiring. e boiler operates to the minimum DHW output.
Check the wiring connection and modula-
tor coil continuity (1).
98 Block - maximum no. of
soware errors e maximum number of soware errors possible has been reached. Press the Reset button (1).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical Aer-Sales Service).
2.6 INFORMATION MENU.
Pressing the buttons (3) and (4) simultaneously
for 3 seconds, the “Information menu” is acti-
vated, which displays some boiler functioning
parameters.
Press buttons (3) and (4) to scroll through the
various parameters. To exit the menu, press
buttons (3) and (4) simultaneously again for 3
seconds or wait for 5 minutes.
List of parameters
Id
Parameter Description
d1 Displays the ame signal
d2
Displays the primary exchanger
output instant ow temperature
(ow probe)
d3
Displays the instant output
temperature from the DHW
exchanger (DHW probe)
d4 Not used
d5 Displays the operating instanta-
neous power (value in %).
d6
Displays the actual temperature
for the central heating set (if
remote control is present)
d7
Displays the temperature set for
the DHW set (if remote control
is present)
E1 - E7 Display the anomaly history, of
which E1 is the most recent
Resetting the anomaly history.
Press the Reset button on the information menu
for > 2 seconds and < 4.5 seconds. "E-" will appear
on the display.
Only during this time, if you release the button,
it resets the anomaly history.

15
11
INSTALLERUSER
MAINTENANCE TECHNICIAN
BOTTOM VIEW
Key:
1 - Filling valve
2 - Draining valve
2.7 BOILER SHUTDOWN.
Press the button (part. 2 Fig. 10) ( ) until the
symbol appears on the display ( ).
NOTE: in these conditions the boiler is still
powered.
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.
2.8 RESTORE CENTRAL HEATING
SYSTEM PRESSURE
Periodically check the system water pressure.
e boiler pressure gauge should read a value of
between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool)
restore normal pressure via the lling cock located
in the lower part of the boiler (Fig. 11).
N.B.: close the valve aer the operation.
If pressure 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
a qualied rm for assistance to remove any
system leakage.
2.9 DRAINING THE SYSTEM.
To drain the boiler, use the special draining valve
(Fig. 11 and 9).
Before draining, ensure that the lling cock is
closed.
2.10 ANTIFREEZE PROTECTION.
e boiler comes standard with an antifreeze
function that activates the pump and burner
when the system water temperature in the boiler
falls below 4°C (standard protection up to the
min. temperature of -5°C) and stops once it ex-
ceeds 42°C. e antifreeze function is guaranteed
if the boiler is fully operative and not in “block”
status, and is electrically powered. To avoid keep-
ing the system switched on in case of a prolonged
absence, the system must be drained completely
or antifreeze substances 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.
All information relative to the anti-freeze protec-
tion is stated in Par. 1.3.In order to guarantee
the integrity of the appliance and the domestic
hot water heating system in areas where the
temperature falls below zero, we recommend
the central heating system is protected using
anti-freeze liquid and installation of the Im-
mergas Anti-freeze Kit in the boiler. In the case
of prolonged inactivity (second case), we also
recommend that:
- disconnect the electric power supply;
- empty the boiler domestic hot water circuit
via the drain valves (Fig. 9) and the internal
domestic hot water distribution network.
2.11 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.12 DECOMMISSIONING.
In the event of permanent shutdown of the
boiler, contact an authorised company for the
suitable procedures and also ensure the electri-
cal, water and fuel supply lines are shut o and
disconnected.

16
12
INSTALLERUSER
MAINTENANCE TECHNICIAN
3COMMISSIONING THE BOILER
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;
- make sure the central heating system is lled
with water and that the boiler manometer
indicates a pressure of 1÷1.2 bar.
- switch the boiler on and ensure correct ignition;
- make sure the gas maximum, medium and
minimum flow rate and pressure values
correspond to those given in the handbook
(Paragraph 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 function-
ing of fans;
- ensure activation of all adjustment devices;
- seal the gas ow rate regulation devices (if
settings are modied);
- ensure production of domestic hot water;
- ensure sealing eciency of water circuits;
- check ventilation and/or aeration of the instal-
lation room where provided.
Even if just one single safety check provides a
negative result, do not commission the system.
3.1 HYDRAULIC DIAGRAM.
Key:
1 - D.H.W. probe
2 - D.H.W. ow switch
3 - Gas valve
4 - Flow limiter
5 - System draining valve
6 - Burner
7 - Rapid heat exchanger
8 - Flue hood
9 - Flue safety thermostat
10 - System expansion vessel
11 - Flow probe
12 - Safety thermostat
13 - Air 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 ow

17
13
3
2
1
4
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.2 WIRING DIAGRAM.
Key: A3 - Integrated P.C.B. B1 - Flow probe B2 - D.H.W. probe CARV2 - Comando Amico Remoto remote control
Version 2 (optional)
E3 - Ignition and detection electrode
E4 - Safety thermostat E6 - Flue safety thermostat F1 - Phase fuse LCD1 - Display M1 - Boiler pump S2 - Selector switch functioning S3 - Reset block key
Colour key: BK - Black BL - Blue BR - Brown G - Green GY - Grey OR - Orange P - Purple PK - Pink R - Red W - White Y - Yellow Y/G - Yellow/Green W/Y - White/Black
S4 - D.H.W. ow switch S5 - System pressure switch S20 - Room thermostat (optional) S21 - Key to increase
DHW temperature
S22 - Key to decrease
DHW temperature
S23 - Key to increase
central heating temperature
S24 - Key to decrease
central heating temperature
T1 - Ignition transformer T2 - Boiler P.C.B. transformer 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 - 230 Vac 50Hz supply voltage 4 - e X5 connector is used for
automatic inspection.
Comando Amico RemotoV2: the boiler is set-up
for the application of the Comando Amico Re-
moto remote control V2 (CARV2) or of the Mini
CRD, which must be connected to clamps 40
and 41, by observing polarity and eliminating
jumper X40.
Room thermostat: the boiler is set-up for the
application of the Room ermostat (S20) which
must be connected to clamps 40 and 41 and by
eliminating jumper X40.
NOTE: the user interface is on the welding side
of the boiler board.

18
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.3 TROUBLESHOOTING
NOTE: 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 boiler lamellar
pack is blocked. Clean the burner or the lamel-
lar 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 pressure
gauge that the system pressure is within estab-
lished limits. Check that the radiator valves
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 function-
ing 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 air vent valve cap (Fig. 9). Make
sure the system pressure and expansion vessel
pressure values are within the set limits; the
pressure value for the expansion vessel must be
1.0 bar, and system pressure must be between
1 and 1.2 bar.
- Ignition block and Chimney block. See Par. 2.5.
- Poor water ow: if, as a result of limestone
(calcium and magnesium), the domestic hot
water system does not work properly, contact a
qualied company for descaling e.g. Authorised
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.

19
14
4
3
2
1
6
5
INSTALLERUSER
MAINTENANCE TECHNICIAN
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 nameplate,
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).
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 (P01) and select (nG) in the case of meth-
ane or propane air supply or (LG) in the case
of LPG supply and save it;
- adjust the boiler nominal heat output;
- adjust the boiler nominal heat output in do-
mestic hot water phase;
- adjust the boiler nominal heat output in heating
phase (para. 3.7);
- adjust (eventually) the maximum heating
power (para. 3.7);
- seal the gas ow rate devices (if adjusted);
- aer completing conversion, apply the sticker,
present in the conversion kit, near the da-
ta-plate. Using an indelible marker pen, delete
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 (Par. 3.17).
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. Author-
ised Aer-Sales Assistance). Burner adjustment
must be carried out using a dierential "U" or
digital type pressure gauge connected to the
gas valve outlet pressure point (part. 4 Fig. 14),
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.
- Activate the chimney sweep function.
(Ref. Par. 3.9) in DHW, making sure that the
maximum boiler output is reached (on the
display “99” is to be displayed).
- From the brass nut (Part. 3 Fig. 14) adjust the
boiler nominal output, observing the maxi-
mum 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 output in the
domestic hot water phase (Part. 2 Fig. 14).
N.B.: only proceed aer having calibrated the
nominal pressure.
Adjustment of the minimum thermal input
is obtained by operating on the cross plastic
screws (2) on the gas valve maintaining the
brass nut blocked (3);
- press the button 4 (Fig. 10) up to reach the
minimum boiler output (on the display “00”
is to be displayed). 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.
NOTE: 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.
NOTE: 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 (Par. 3.17).
Key:
1 - Coil
2 - Minimum output adjustment
screws
3 - Maximum output adjust-
ment nut
4 - Outlet pressure point
gas valve
5 - Gas valve inlet pressure point
6 - Protection hood
VK 8105 M GAS valve

20
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.7 PROGRAMMING THE P.C.B.
e boiler is prepared for possible programming of
several operation parameters. By modifying these
parameters as described below, the boiler can be
adapted according to specic needs.
To access the programming phase, proceed as
follows (Fig. 10):
- press buttons (1) and (2) for 5 about seconds
until the programming mode is accessed on
the display;
- using keys (3) and (4), select the parameter to
be changed indicated in the following table:
- adjust the corresponding value consulting the
table using keys (5) and (6): rst pressure of
buttons displays the current value;
- conrm the value set by pressing the Reset but-
ton (1) for about 5 seconds. Only the displayed
value is saved.
Note: 2 minutes aer no button is touched
will automatically cancel the operation or by
pressing buttons (1) and (2) simultaneously for
about 5 seconds. Modied but not conrmed
values are to be restored to the value preceding
the modication.
Id
Parameter Parameter Description Range (ref. 9 Fig. 2-1) Default
P00 Solar panels
selection
e setting of this function is used to set the boiler in order to function with the use
of 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 temperature. In
OFF mode, the burner is switched o at maximum value.
on - oF oF
P01 Gas type selec-
tion
e setting of this function is used to adjust the boiler so that it can operate with the
correct type of gas
nG - Methane
LG - LPG
Set accord-
ing to the
gas being
used
P02
Heating switch-
on delay request
from room
thermostat and
remote control.
e boiler is set to switch-on 3 seconds aer the request. In the event of particular
systems (e.g. area systems with motorised thermostatic valves etc.) it may be neces-
sary to delay ignition
00 - 20
(00 = 3 seconds
01 = 30 seconds
02 = 60 seconds
20 = 600 sec-
onds)
00
P03 Function
anti-leakage
is function reduces the heating temperature to 57°C in the case that domestic hot
water circulation is detected in the heating mode. on - oF oF
P04
Domestic hot
water post circu-
lation function
With the post-circulation function active aer domestic hot water withdrawal, the
pump remains on for 2.5 seconds in winter time and 1.5 seconds in summer time to
reduce the formation of limestone.
on - oF on
P05 Minimum CH
output
e boiler also has electronic modulation that adapts the boiler potentiality to the
eective heating demand of the house. en the boiler works normally in a variable
gas pressure eld between the minimum heating output and the maximum heating
output depending on the system's heating load.
NOTE: the boiler is produced and calibrated in the central heating phase at nominal
output. Approximately 10 minutes are needed to reach the nominal heat output,
which can be changed using the parameter (P08).
NOTE: the selection of the “Minimum heating output” and “Maximum heating out-
put” parameters, in presence of a heating request, allows boiler ignition and power
supply of the modulator with current equal to the value of the respective set value.
00 - 70 %
Set
according
to factory
inspection
P06 Maximum CH
output
00 - 99
(99 = 100%) 99
P07 Central heating
ignitions timer
e boiler has electronic timing, which prevents the burner from igniting too oen
in central heating mode
01 - 20
01 = 30 seconds
02 = 60 seconds
20 = 600 sec-
onds
06
P08 Central heating
ramp timer
In the ignition phase, the boiler performs an ignition ramp in order to arrive at the
maximum nominal power set (P06).
01 - 20
01 = 30 seconds
02 = 60 seconds
20 = 600 sec-
onds
20
P09 Boiler type Not used on this model. 01 01
P10 Power
ignition Not used on this model. - - - - - -
P11 Minimum heat-
ing setting Denes the minimum ow temperature 35 - 80 °C 35 °C