Immergas MINI NIKE 24 4 ERP Product manual

Instruction and
warning book
Installer
User
Maintenance Technician
IE
*1.038450ENG*
MINI NIKE
24 4 ERP
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.

e manufacturer declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without forewarning.
Dear Customer,
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 instruction manual provides technical information for installing the Immergas kit. 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 current regulation and technical standards.
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 an authorised company,
which has specic technical expertise in the system sector, as required by Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to people, animals
and objects. Read the instructions provided with the product carefully to ensure a proper installation.
Maintenance must be carried out by an authorised company. e Authorised Aer-sales Service represents a guarantee of qualication and professionalism.
e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and therefore potentially
dangerous.
If errors occur during installation, operation and maintenance, due to non compliance with technical laws in force, standards or instructions contained in this
book (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and extra-contractual liability for any damages and the
appliance warranty is invalidated.
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.

INDICE
USER pag.INSTALLATOR pag. MAINTENANCE TECHNICIAN pag.
1 Boiler installation......................................5
1.1 Installation recommendations.................5
1.2 Main dimensions.......................................5
1.3 Gas connection..........................................6
1.4 Hydraulic connection...............................6
1.5 Electrical connection................................6
1.6 Remote controls and room
chronothermostats (optional). ................7
1.7 External probe (optional).........................7
1.8 Ventilation of the rooms. .........................7
1.9 Evacuation of combustion products:
ue duct and branched multiple ues ...8
1.10 Flue exhaust control device......................8
1.11 System lling..............................................8
1.12 Gas system start-up...................................8
1.13 Boiler start up (ignition)................................8
1.14 Circulation pump......................................9
1.15 Kits available on request.........................10
1.16 Boiler components..................................11
2 Instructions for use and maintenance..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 Using the boiler........................................13
2.6 Troubleshooting. .....................................13
2.7 Boiler shutdown. .....................................14
2.8 Restore central heating system
pressure.....................................................14
2.9 System draining.......................................14
2.10 Anti-freeze protection. ...........................14
2.11 Case cleaning...........................................14
2.12 Decommissioning...................................14
3 Boiler start-up (initial check). ...............15
3.1 Hydraulic diagram. .................................15
3.2 Wiring diagram.......................................16
3.3 Troubleshooting. .....................................16
3.4 Information menu...................................17
3.5 Programming the p.C.B. ........................17
3.6 Converting the boiler to other types
of gas. ........................................................18
3.7 Checks following conversion to
another type of gas..................................18
3.8 Possible adjustments...............................19
3.9 Automatic slow ignition function
with timed ramp delivery.......................19
3.10 Chimney sweep” function......................19
3.11 Pump anti-block function......................19
3.12 ree-way anti-block function..............19
3.13 Radiators anti-freeze function...............19
3.14 P.C.B. Periodical self-check....................19
3.15 Solar panels coupling function..............19
3.16 Casing removal........................................20
3.17 Yearly appliance check and
maintenance.............................................22
3.18 Variable heat output................................22
3.19 Combustion parameters.........................23
3.20 Technical data..........................................23
3.21 Data plate key............................................24
3.22 Technical parameters for combination
boilers (in compliance with regulation
813/2013)..................................................25
3.23 Product che (in compliance with
regulation 811/2013)...............................25
3.24 Parameters for lling in
the package che. ....................................26

5
1-1 1-2
INSTALLATORUSER
MAINTENANCE TECHNICIAN
YES NO
1BOILER INSTALLATION
1.1 INSTALLATION
RECOMMENDATIONS.
e Nike Mini Nike 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 place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural) such to allow
(always in safety, efficiency and comfortable
conditions):
- installation (according to the provisions of the
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (to outdoors in the place for
loading and transporting the appliances
and components) as well as their eventual
replacement 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. 1-1).
Only professionally enabled 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.
Attention: the manufacturer declines all liability
for damages caused by boilers removed from
other systems or for any non-conformities of
such equipment.
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 im-
portant that the intake grids are not obstructed.
Keep all ammable objects away from the ap-
pliance (paper, rags, plastic, polystyrene, etc.).
Do not place household appliances underneath
the boiler as they could be damaged if the safety
valve intervenes with an obstructed conveying
system (the safety valve must be conveyed away
by a draining 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.
For the aforementioned reasons, we recommend
not placing furnishings, furniture, etc. under
the boiler.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o immediately
and contact a qualied technician (e.g. the Im-
mergas After-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 in places with a fire risk is
prohibited (for example: underground car
parks, garages), potentially dangerous places,
gas appliances and relative ue ducts.
- installation is prohibited on the vertical
projection of cooking hobs;
- 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.) unless 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.
- 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
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
N.B.: connection group (optional)
Height
(mm)
Width
(mm)
Depth
(mm)
785 440 240
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”

6
INSTALLATORUSER
MAINTENANCE TECHNICIAN
Fuel gas quality. e appliance has been de-
signed to operate with gas free of impurities; oth-
erwise 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: In order not to void the warranty
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.
Treatment of the water of the heating and water
system is required, in compliance with the
technical standards in force, in order to protect
the system and the appliance from deposits (e.g.
limescale), slurry or other hazardous deposits.
Hydraulic 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 manufacturer 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 that is not its own
brand.
In order to meet the system requirements
established by the regulations in terms of
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 Mini Nike 24 4 ErP boiler has an IPX4D
protection rating for the entire appliance. Elec-
trical safety of the unit is reached when it is cor-
rectly connected to an ecient earthing system
as specied by current safety standards.
Important: the manufacturer declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an ef-
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.
Boilers are supplied complete with an “X” type
power cable without plug. e power supply
cable must be connected to a 230V ±10% /
50Hz mains supply respecting L-N polarity and
earth connection . is network must also
have an omnipolar circuit breaker with class III
over-voltage category. When replacing the power
supply cable, contact a qualied company (e.g.
the the Authorised Aer-Sales Technical Assis-
tance Service). e power cable must be laid as
shown. In the event of mains fuse replacement
on the P.C.B., use a 2A quick-blow fuse. For the
main power supply to the appliance, never use
adapters, multiple sockets or extension leads.
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.
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 (ac-
cording 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 central 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 op-
eration with the other type of gas (see converting
appliance for other gas types). e dynamic gas
supply (methane or LPG) pressure must also be
checked according to the type used in the boiler,
which must comply with the regulations in force,
as insucient levels can reduce generator output
and cause malfunctions.
Ensure correct gas cock connection by follow-
ing the mounting instructions illustrated in
the gure. e gas supply pipe must be suitably
dimensioned according to current regulations in
order to guarantee correct gas ow to the burner
even in conditions of maximum generator output
and to guarantee appliance eciency (technical
specications). e coupling system must con-
form to standards.

7
1-3
45
31
58
1-4 1-5
INSTALLATORUSER
MAINTENANCE TECHNICIAN
1.6 REMOTE CONTROLS AND
ROOM CHRONOTHERMOSTATS
OPTIONAL.
e boiler is prepared for the application of room
chronothermostats or remote controls, which are
available as optional kits. (Fig. 1-3)
All Immergas chronothermostats can be con-
nected with 2 wires only. Carefully read the
user and assembly instructions contained in the
accessory kit.
• On/O digital chronothermostat. e chrono-
thermostat 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 tempera-
ture).
- 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.
• Comando Amico Remoto Remote Control De-
viceV2 (CARV2) with climate chronothermostat
function. In addition to the functions described
in the previous point, the CAR panelV2 enables
the user to control all the important informa-
tion regarding operation of the appliance and
the heating system with the opportunity of eas-
ily intervening on the previously set parameters
without having to go tothe place where the ap-
pliance is installed. e panel is provided with
self-diagnosis to display any boiler functioning
anomalies. e climate chronothermostat in-
corporated into the remote panel 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 chronothermostat
is fed directly by the boiler by means of the
same 2 wires used for the transmission of data
between boiler and chronothermostat.
Important: If the system is subdivided into zones
using the relevant kit. the CARV2 must be used
with its climate thermostat function disabled, i.e.
it must be set to On/O mode.
Comando Amico Remoto remote controlV2
or On/O chronothermostat electrical con-
nections (Optional). e operations described
below must be performed aer having removed
the voltage from the appliance. Any thermostat
or On/O environment chronothermostat must
be connected to clamps 40 and 41 eliminating
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.
Any Comando Amico Remoto remote controlV2
must be connected to clamps 40 and 41 elimi-
nating jumper X40 on the circuit board, paying
attention not to invert the connections (Fig. 3-2).
Important: if the Comando Amico Remoto
remote controlV2 or any other On/O chrono-
thermostat 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 mak-
ing the boiler electrical connections.
1.7 EXTERNAL PROBE OPTIONAL.
e boiler is prepared for the application of the
external probe (Fig. 1-4), which is available as
an optional kit.
e probe can be connected directly to the boiler
electrical system and allows the max. system
ow temperature to be automatically decreased
when the external temperature increases, in
order to adjust the heat supplied to the system
according to the change in external temperature.
e external probe always acts when connected
independently from the presence or type of room
thermostat used. e correlation between system
ow temperature and external temperature is de-
termined by the position of the selector switch on
the boiler control panel according to the curves
shown in the diagram (Fig. 1-5). e electric con-
nection of the external probe must be made on
clamps 38 and 39 on the boiler P.C.B. (Fig. 3-2).
1.8 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;
- condotti di ventilazione, singoli oppure collet-
tivi ramicati.
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 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.
Position of the central
heating temperature user adjustment

8
INSTALLATORUSER
MAINTENANCE TECHNICIAN
1.9 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.
1.10 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.
1.11 SYSTEM FILLING.
Once the boiler is connected, ll the system 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 vent valves.
Close radiator vent valves only when water es-
capes 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.
Tighten the cap aer the operation.
1.12 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 the specications set forth by
technical regulations in force.
1.13 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 the specications set forth by
technical regulations in force;
- make sure 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 check correct ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the
manual (par. 3.18);
- 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
1-6
1-7
INSTALLATORUSER
MAINTENANCE TECHNICIAN
Key:
1 - Function selection button
2 - Green (G) / red (R) LED
3 - 4 yellow LEDs (Y)
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
1.14 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. 20 Fig. 1-9). 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. 1-7):

10
1-8
A3
V1
A2
V3
V2
A1
A3
V1
A2
V3
V2
A1
INSTALLATORUSER
MAINTENANCE TECHNICIAN
Open bypass
Closed bypass
Circulator pump absorbed power (W)
Flow rate (l/h)
Head (kPa)
Circulator pump absorbed power (W)
Flow rate (l/h)
Head (kPa)
1.15 KITS AVAILABLE ON REQUEST.
• System shut 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 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 water production conditions.
e boiler is prepared for application of the
polyphosphate dispenser kit.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
Total head available to the system.
Key:
V1 = Total head available to the system with
pump at speed 2
V2 = Total head available to the system with
pump at speed 3
V3 = Total head available to the system with
pump at speed 4
A1 = Power absorbed by the pump at speed 2
A2 = Power absorbed by the pump at speed 3
A3 = Power absorbed by the pump at speed 4

11
1-9
INSTALLATORUSER
MAINTENANCE TECHNICIAN
1.16 BOILER COMPONENTS.
Key:
1 - Flue 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 - Flow probe
10 - Primary heat exchanger
11 - Safety thermostat
12 - Combustion chamber
13 - Ignition and detection electrodes
14 - System expansion vessel
15 - Burner
16 - Vent valve
17 - DHW heat exchanger
18 - ree-way valve (motorised)
19 - System draining valve
20 - By-pass
21 - 3 bar safety valve
N.B.: connection group (optional)

12
2-1
INSTALLATORUSER
MAINTENANCE TECHNICIAN
2INSTRUCTIONS FOR USE AND MAINTENANCE
2.1 CLEANING AND MAINTENANCE.
Attention: to preserve the boiler’s integrity and
keep the safety features, performance and reli-
ability 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 mul-
tiple ues are stated in Par. 1.8, 1.9 e 1.10. If in
doubt regarding correct ventilation, contact an
authorised 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
near ducting or devices for ue extraction and the
relative accessories, switch o the appliance and
on completion of the operations make sure that
an authorised company veries the eciency of
the ducting or the devices.
Never clean the appliance or connected parts
with easily ammable substances.
Never leave containers or ammable substances
in the same environment as the appliance.
It is prohibited and dangerous to obstruct the air
intake, even partially, for the ventilation of the
room in which the 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.
• Important: the use of components that employ
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 barefoot;
- 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;
- if the cable is damaged, switch o the ap-
pliance and solely contact an authorised
company to replace it;
- 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/O/Summer/Winter button
3 - ( ) button to increase
the domestic hot water temperature
4 - ( ) button to decrease
the domestic hot water temperature
5 - ( ) button to increase the system
water temperature
6 - ( ) button to reduce the system water
temperature
7 - Boiler manometer
8 - DHW production phase functioning*
active
9 - Boiler connected to remote control
(optional)
10 - Flame presence symbol and relative
power scale
11 - Functioning with external temperature
probe active (optional)
12 - Room central heating active phase
functioning
13 - Functioning in winter mode
14 - Functioning in summer mode
15 - Boiler in Stand-by mode
16 - Temperature and error code display
17 - Boiler in block does not require release
via “Reset” button

13
INSTALLATORUSER
MAINTENANCE TECHNICIAN
2.5 USING THE BOILER.
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 the button (2) until the display switches
on, aer which press the button in sequence
(2) and take the boiler to the summer ( )
or winter ( ) position.
• Summer ( ):in this mode the boiler fun-
ctions only to produce the DHW, the tempera-
ture is set via the buttons (3-4) and the relative
temperature is shown on the display via the
indicator (16).
• Winter ( ):in this mode the boiler functions
both for producing domestic hot water and
heating the environment. e temperature of
the DHW is always regulated via buttons (3-4),
the heating temperature is regulated via buttons
(5-6) and the relative temperature is shown on
the display via the indicator (16).
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 burner ignites, the relative ame
present symbol is displayed (10) with relative
power scale.
• Operation with Comando Amico Remoto
remote controlV2 (CARV2) (Optional). If the
CARV2 is connected, the ( ) symbol will
appear on the display. e boiler regulation pa-
rameters can be set via the CARV2 control panel
and the reset button (1) remains active on the
boiler control panel, along with the switch-o
button (2) (“o” mode only) and the display
where the functioning state is shown.
Important: if the boiler is put into “o” mode
on the CARV2 the “CON” connection error
symbol will appear on the CAR. e CARV2 is
however powered constantly so as not to loose
memorised programs.
• Functioning with optional external probe
( ).In the case of a system with optional
external probe, the boiler ow temperature for
room central heating is managed by the exter-
nal probe depending on the external tempera-
ture measured (Par. 1.6). e ow temperature
can be modied by selecting the functioning
curve via buttons (5 and 6), selecting a value
from “0 to 9” (Fig. 1-5).
With external probe present, the relative
symbol will appear on the display (12). In the
central heating phase, if the temperature of the
water contained in the system is sucient to
heat the radiators, the boiler can only function
with the activation of the pump.
• “Stand-by” mode. Press button (2) in suc-
cession until the ( ) symbol appears. e
boiler remains active from this moment and the
anti-freeze function, pump anti-block function
and 3-way and signalling of any anomalies is
guaranteed.
N.B.: in these conditions the boiler is conside-
red still live.
• “Off” mode. The safety functions are not
guaranteed in this mode.
N.B.: in these conditions the boiler is consi-
dered still live even if there are no functions
active.
• Display functioning. e display lights up
during the use of the control panel, aer 15se-
conds inactivity, the brightness drops until just
the active symbols are displayed. e lighting
mode can be varied via parameter P2 in the
circuit board customisation menu.
2.6 TROUBLESHOOTING.
e boiler signals out anomalies by ashing on
the display and relative error codes, listed on the
table, are displayed. On any remote controls, the
error code will be displayed using a numerical
code preceded or followed by the letter E (e.g.
CARV2= Exx).
Code dis-
played
(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-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
Aer an appropriate cooling press the Reset
button (1)
e boiler will automatically restart aer 30
minutes if normal conditions resume with-
out 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 General boiler board
anomaly
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.
In this case the boiler continues to produce
domestic hot water but not with optimal
performance (1)
08 Maximum N° of reset Number of allowed resets that have already performed.
Attention: the anomaly can be reset 5 times
consecutively, aer 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
o again, the 5 attempts are re-acquired.
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
15 Conguration error If the board detects an anomaly or incongruity on the electric wiring,
the boiler will not start.
If normal conditions are restored the boiler
restarts without having to be reset. Check
that the boiler is congured correctly (1).
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)
(1) If the shutdown or fault persists, contact an authorised company (e.g. Technical After-Sales Service).

14
2-2
INSTALLATORUSER
MAINTENANCE TECHNICIAN
Key:
1 - Filling valve
2 - Draining valve
BOTTOM VIEW
Code dis-
played
(ashing) Anomaly signalled Cause Boiler status / Solution
24 Push button control
panel anomaly e board detects an anomaly on the pushbutton panel.
If normal conditions are restored the
boiler 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:
- 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).
31 Loss of remote control
communication
is occurs if an incompatible remote control is connected, or if
communication between the boiler and the remote control is lost.
Power cycle the boiler. If the Remote Con-
trol 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 “Central Heating” (1) mode
cannot be activated.
37 Low power supply
voltage
is 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)
38 Loss of ame signal
is occurs when the boiler is ignited correctly and the burner ame
switches o unexpectedly; a new attempt at ignition is performed and
if normal conditions are restored, the boiler does not have to be reset.
If normal conditions are restored the boiler
restarts without having to be reset (1)
43
Block due to loss of
continuous ame
signal
is occurs if the ''Flame signal loss'' error occurs many times in a
row within a preset period (38).
Press the Reset button, before restarting,
the boiler will run a post-ventilation cycle
(1).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Technical After-Sales Service).
2.7 BOILER SHUTDOWN.
For complete boiler switch-o, press the “o”
button, disconnect the onmipolar switch outside
of the boiler and close the gas cock upstream
from 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 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 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 as-
sistance 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 SYSTEM DRAINING.
To drain the boiler, use the special draining
valve (Fig. 2-2)
Before draining, ensure that the lling valve is
closed.
2.10 ANTIFREEZE PROTECTION.
The boiler has an anti-freeze function that
switches on automatically when the temperature
falls below 4°C (standard protection to minimum
temperature of -5°C). In order to guarantee the
integrity of the appliance and the domestic hot
water heating system in zones where the tempera-
ture falls below zero, we recommend the central
heating system is protected using anti-freeze
liquid. In the case of prolonged inactivity (second
case), we also recommend that:
- disconnect the electric power supply;
- the central heating circuit and boiler domestic
hot water circuit must be drained. In systems
that are drained frequently, lling must be car-
ried out with suitably treated water to eliminate
hardness that can cause lime-scale.
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.

15
3-1
INSTALLATORUSER
MAINTENANCE TECHNICIAN
3BOILER STARTUP INITIAL CHECK.
To commission the boiler:
- make sure 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 manometer indicates
a pressure of 1÷1.2 bar.
- switch the boiler on and check correct ignition;
- make sure the gas maximum, intermediate
and minimum ow rate and pressure values
correspond to those given in the handbook,
Par. 3.18;
- 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;
3.1 HYDRAULIC DIAGRAM.
- 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 any checks/inspection give negative results, do
not start the boiler.
Key:
1 - Domestic hot water ow switch
2 - System lling valve
3 - Flow limiter
4 - Domestic hot water probe
5 - Gas valve
6 - System expansion vessel
7 - Burner
8 - Primary heat exchanger
9 - Flue hood
10 - Flue safety thermostat
11 - Safety thermostat
12 - Delivery probe
13 - Vent valve
14 - Boiler pump
15 - System draining valve
16 - System pressure switch
17 - DHW. heat exchanger
18 - ree-way valve (motorised)
19 - By-pass
20 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
R - System return
M - System ow

16
3-2
5
1
2
6
5
4
3
4
4 5
11
7
7
7
12
12
7
13
13
11
5
7
4
10
10
10
10
9
8
INSTALLATORUSER
MAINTENANCE TECHNICIAN
3.2 WIRING DIAGRAM.
Key:
B1 - Flow probe
B2 - Domestic hot water probe
B4 - External probe
CARV2 - Comando Amico Remoto remote
control Version 2 (optional)
DS1 - Display
E3 - Ignition and detection electrodes
E4 - Safety thermostat
E6 - Flue safety thermostat
F1 - Phase fuse
M1 - Boiler pump
M30 - ree-way valve
S2 - Selector switch functioning
S3 - Reset block key
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
decrease key
S23 - Heating temperature increase key
S24 - Heating temperature reduce key
e boiler is designed for application of a room
thermostat (S20), an On/O room chronother-
mostat, a program timer or a Comando Amico
Remoto remote controlV2 (CARV2). Connect
to clamps 40 - 41 eliminating the jumper X40,
paying attention not to invert the polarity if the
CARV2 is installed.
e connector X8 is used for the connection
of the Virgilio Palmtop in the microprocessor
soware updating operation.
3.3 TROUBLESHOOTING.
N.B.: maintenance interventions 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 boiler
lamellar pack.
- Frequent interventions of the over heat-
ing safety 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 sys-
tem pressure is within established 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 ue safety ther-
mostat is can be caused by obstructions in
the ue gas 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 hood of the special air vent valve (Fig.
1-9). Make sure the system pressure and expan-
sion 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.
2.6 and 1.7 (electric connection).
T1 - Low voltage feeder
T2 - Switch-on 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 - 230 Vac 50Hz power supply
4 - Blue
5 - Brown
6 - Yellow/Green
7 - Black
8 - (DHW)
9 - (central heating)
10 - Grey
11 - White
12 - Red
13 - Green

17
INSTALLATORUSER
MAINTENANCE TECHNICIAN
3.4 INFORMATION MENU.
Pressing the buttons (3 and 4) for 5 seconds, the
“Information menu” is activated, which allows
to display some boiler functioning parameters.
To scroll through the various parameters, press
(3 and 4), to exit from the menu press buttons
(3 and 4) again for 5 seconds or press button (2)
for 5 seconds or wait for 60 seconds.
List of parameters.
N°
parameter
Description
d1 Displays the ame signal (uA).
d2
Displays the primary exchanger
output instant heating ow
temperature.
d3
Displays the instant output
temperature from the DHW
exchanger.
d4
Displays the temperature set for
the central heating set (if remote
control is present).
d5
Displays the temperature set for
the DHW set (if remote control
is present).
d6
Displays the external envi-
ronment temperature (if the
external probe is present).
If the temperature is below zero,
the value is displayed ashing.
3.5 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:
- press buttons (1) and (2) at the same time for
approximately 8 seconds;
- Using buttons (3) and (4), select the parameter
to be changed indicated in the following table:
List of
parame-
ters
Description
P1 Boiler mode (DO NOT USE)
P2 Display lighting
P3 DHW thermostat
P4 Minimum CH output
P5 Maximum CH output
P6 Central heating ignitions timer
P7 Central heating ramp timer
P8
Heating switch-on delay
request from room thermostat
and remote control
P9 Solar mode
- adjust the corresponding value consulting the
table using buttons (5) and (6);
- conrm the set value pressing the Reset button
(1) for approximately 3 seconds; by pressing
keys (3) and (4) at the same time exit the func-
tion without memorising the modications
made.
N.B.: aer a period of time, without touching
any keys, the operation cancels automatically.
Boiler mode. It establishes whether the boiler
functions in instant or storage mode.
Boiler mode (P1)
Range of values which can
be set
Standard
setting
0 - instant boiler
1 - boiler with storage tank 0
Illuminazione display. Stabilisce la modalità di
illuminazione del display.
Display lighting (P2)
Range of values which can
be set
Standard
setting
0 - O
1 - Auto
2 - On
1
- O: the display is always lit with low intensity.
- Auto: the display lights up during use and low-
ers aer 15 seconds of inactivity. In the case of
anomaly the display ashes.
- On: the display is always lit with high intensity.
DHW thermostat. With the “correlated” ther-
mostat setting, boiler switch-o takes place on
the basis of the temperature set. While with
the setting of the “xed” DHW thermostat the
switch-o temperature is xed at the maximum
value independently from the value set on the
control panel.
DHW thermostat (P3)
Range of values which can
be set
Standard
setting
0 - Fixed
1 – Correlated 1
Heating 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 pres-
sure eld between the minimum heating power
and the maximum heating power depending on
the system’s heating load.
N.B.: 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 (P5).
N.B.: the selection of the “Minimum heating
power” and “Maximum heating power” param-
eters, 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 central heating output (P4)
Range of values which can
be set
Standard
setting
0 - 63 %
Set
according
to factory
inspection
Maximum heating output (P5)
Range of values which can
be set
Standard
setting
0 - 99 % 99
Central heating ignitions timer. e boiler has
electronic timing, which prevents the burner
from igniting too oen in central heating mode.
Central heating ignitions timer (P6)
Range of values which can
be set
Standard
setting
0 - 20 (0 - 10 minutes)
(01 equals 30 seconds)
6
(3’)
Central heating ramp timing. In the ignition
phase, the boiler performs an ignition ramp in
order to arrive at the maximum power set.
Central heating ramp timer (P7)
Range of values which can
be set Parameter
0 - 28 (0 - 14 minutes)
(01 equals 30 seconds)
28
(14’)

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INSTALLATORUSER
MAINTENANCE TECHNICIAN
Heating switch-on delay request from room
thermostat and remote control. e boiler is
set to switch-on immediately aer a request. In
the case of particular systems (e.g. area systems
with motorised thermostatic valves etc.) it could
be necessary to delay switch-on.
Heating switch-on delay request from
room thermostat and remote control (P8)
Range of values which can
be set Parameter
0 - 20 (0 - 10 minutes)
(01 equals 30 seconds)
0
(0’)
DHW ignition delay. e boiler is set to switch-
on immediately aer a request. for DHW In
the case of coupling with solar storage tanks
positioned upstream from the boiler, it is pos-
sible to compensate the distance of the storage
tank in order to allow the hot water to reach the
utility, setting the necessary time and therefore
verifying that the water is hot enough (see Par.
Solar panels coupling).
Solar mode (P9)
Range of values which can
be set
Standard
setting
0 - 20 seconds 0
Gas type selection. e setting of this function
is used to adjust the boiler in order to function
with the correct type of gas.
To access this regulation, once having entered the
programming mode, press the button (2) for 4
seconds. To exit, press button (2) again 4seconds.
Gas type selection (G1)
Range of values which can
be set
Standard
setting
nG - Methane
lG - LPG
Ci - China
e same
as the
type of gas
being used
Ignition power (G2)
Range of values which can
be set
Standard
setting
0 - 70 %
Set
according
to factory
inspection
3.6 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;
- use the boiler push button control panel to
select the gas parameter type (G1) and select
(Ng) in case of Methane supply or (Lg) in the
case of LPG;
- adjust the boiler nominal heat output;
- adjust the boiler minimum heat power;
- adjust the boiler nominal heat output in heating
phase;
- adjust (eventually) the maximum heating
power;
- seal the gas ow rate regulation devices (if set-
tings 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 (par. 3.18).
3.7 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 Fig.3-3),
keeping to the pressure value given in the table
(Par. 3.18) according to the type of gas for which
the boiler is prepared.
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

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INSTALLATORUSER
MAINTENANCE TECHNICIAN
3.8 POSSIBLE ADJUSTMENTS.
N.B.: to adjust the gas valve, remove the plastic
cap (6); aer adjusting, ret the cap.
• Preliminary calibration operations.
- Set parameter P4 at 0 %.
- Set parameter P5 at 99 %.
• Activate the chimney sweep function.
- Enter the “DHW chimney sweep” mode,
opening a DHW cock.
• Adjustment of boiler nominal thermal heat
output.
- Set the maximum output (99%) using the
buttons (5 and 6 Fig. 2-1).
- Adjust the boiler nominal power on the brass
nut (3 Fig. 3.3), keeping to the maximum
pressure values stated in the tables (Par.3.18)
according to the type of gas; by turning
clockwise the heat potential increases, anti-
clockwise it decreases.
• Adjustment of boiler minimum thermal heat
output.
N.B.: only proceed aer having calibrated the
nominal pressure.
- Set the minimum output (0%) always using
the buttons (5 and 6 Fig. 2-1).
- Adjust the minimum thermal input by op-
erating on the cross plastic screws (2) on the
gas valve maintaining the brass nut blocked
(3);
• Exit the “Chimney sweep” mode and keep the
boiler functioning.
• Adjustment of the boiler minimum heat output
in heating phase.
N.B.: only proceed aer having calibrated the
minimum boiler pressure.
- To adjust the minimum heat output during
the heating phase, change parameter (P4),
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.3.18).
• Adjustment (any) of the boiler maximum heat
output in heating phase.
- To adjust the maximum 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 maximum
heat output must be adjusted in central heat-
ing phase, must not be carried out in refer-
ence to that stated in the tables (Par. 3.18).
3.9 AUTOMATIC SLOW IGNITION
FUNCTION WITH TIMED RAMP
DELIVERY.
In ignition phase, the P.C.B. supplies constant
gas with pressure proportional to the parameter
“G2” set.
3.10 CHIMNEY SWEEP” FUNCTION.
When activated, this function forces the boiler
to variable output for 15 minutes.
In this state all adjustments are excluded and only
the safety thermostat and the limit thermostat
remain active. To activate the chimney sweep
function, press the Reset button (1) for 8 seconds
in absence of DHW requests, its activation is sig-
nalled by the indication of the ow temperature
and the ashing and symbols.
is function allows the technician to check
the combustion parameters. Once the function
is activated, it is possible to select whether to
perform the check in CH status, regulating the
parameters with buttons (5 and 6) or in DHW
mode opening any DHW cock and always regu-
late the parameters with the buttons (5 and 6).
Functioning in CH or DHW mode is visualised
by the relative ashing or symbols.
On completion of the checks, deactivate the
function by pressing the Reset button (1) for
8 seconds.
3.11 PUMP ANTIBLOCK FUNCTION.
e boiler has a function that starts the pump
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.
3.12 THREEWAY ANTIBLOCK
FUNCTION.
The boiler is supplied with a function that
activates the motorises three-way unit every
24hours, carrying out a complete cycle in order
to reduce the risk of three-way block due to
prolonged inactivity.
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 central heating mode or
with boiler in stand-by, the function activates
every 18 hours aer the last boiler check/power
supply. In case of functioning in domestic hot wa-
ter 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.
3.15 SOLAR PANELS COUPLING
FUNCTION.
e boiler is set-up to receive pre-heated water
from a system of solar panels up to a maximum
temperature of 65°C. In all cases, it is always
necessary to install a mixing vale on the hy-
draulic circuit upstream from the boiler on the
cold water inlet.
Note: for good functioning of the boiler; the
temperature selected on the solar valve must
be 5 °C greater with respect to the temperature
selected on the boiler control panel.
For correct use of the boiler in this condition,
parameter P3 (DHW thermostat) must be set at
“1” and the parameter P9 (DHW ignition delay)
at a temperature sucient to receive water from
a storage tank situated upstream from the boiler.
e greater the distance from the storage tank,
the longer the stand-by time to be set. When
these regulations have been performed, when
the boiler inlet water is at the same or greater
temperature with respect to that set by the DHW
selector switch, the boiler does not switch on.

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INSTALLATORUSER
MAINTENANCE TECHNICIAN
a
1
Installation drawings key:
Unmistakable component identication
Sequential identication of the operation to perform
3.16 CASING REMOVAL.
To facilitate boiler maintenance the casing can be
completely removed as follows: (Fig. 3-4 / 3-5):
1 Unhook the decorative frame (a) from the
relative lower retainers.
2 Remove the decorative frame (a) from the
casing (c).
3 Loosen the 2 front screws (b) for xing the
casing.
4 Loosen the 2 lower screws (d) for xing the
casing.
5 Pull the case towards yourself (c).
6 Push the case (c) upwards at the same time to
release it from the upper hooks.