Immergas NIKE MINI 28 KW SPECIAL Product manual

NIKE MINI 28 KW
SPECIAL
Instruction and
warning booklet
IE
*1.038788ENG*

Immergas S.p.A. declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without prior notice.
Dear Client,
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.
Contact our area authorised aer-sales centre as soon as possible to request commissioning. Our technician will verify the correct functioning conditions; he
will perform the necessary calibrations and will demonstrate the correct use of the generator.
For assistance and scheduled maintenance contact Authorised Immergas Aer-Sales centres: they have original spare parts and are specically trained directly
by the manufacturer.
General recommendations
All Immergas products are protected with suitable transport packaging.
e material must be stored in dry environments protected against bad weather.
e instruction book is an integral and essential part of the product and must be consigned to the new user also in the case of transfer or succession of ownership.
It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation, use and maintenance stages.
is instructions manual provides technical information for installing Immergas boilers. As for the other issues related to boiler installation (e.g. safety in the work
site, environment protection, injury prevention), it is necessary to comply with the provisions specied in the regulations in force and principles of good practice.
In compliance with legislation in force, the systems must be designed by qualied professionals, within the dimensional limits established by the Law. Installation
and maintenance must be performed in compliance with the regulations in force, according to the manufacturer's instructions and by professionally qualied
sta, intending sta with specic technical skills in the plant sector, as envisioned by the Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to people, animals
and objects. Read the instructions provided with the product carefully to ensure a proper installation.
Maintenance must be carried out by skilled technical sta. e Immergas Authorised Aer-sales Service represents a guarantee of qualications and
professionalism.
e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and therefore potentially
dangerous.
If errors occur during installation, operation and maintenance, due to non compliance with technical laws in force, standards or instructions contained in this
book (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and extra-contractual liability for any damages and the
appliance warranty is invalidated.
For further information regarding legislative and statutory provisions relative to the installation of gas heat generators, consult the Immergas site at the
following address: www.immergas.com

INDEX
1 Boiler installation......................................4
1.1 Installation recommendations.................4
1.2 Main dimensions.......................................5
1.3 Connections (OPTIONAL). ....................5
1.4 Remote controls and room chrono-
thermostats (Optional).............................6
1.5 External probe (Optional). ......................7
1.6 Ventilation of the rooms. .........................7
1.7 Flue ducts. .................................................. 7
1.8 Flues/Chimneys.........................................7
1.9 System lling..............................................8
1.10 Gas system start-up...................................8
1.11 Boiler start-up (ignition)..........................8
1.12 Circulation pump...................................... 8
1.13 Kits available on request...........................8
1.14 Boiler components.................................... 9
2 Instructions for use and maintenance..10
2.1 Cleaning and maintenance. ...................10
2.2 Ventilation of the rooms.........................10
2.3 General warnings....................................10
2.4 Control panel...........................................10
2.5 Ignition of the boiler. ..............................11
2.6 Troubleshooting. .....................................11
2.7 Boiler shutdown ......................................12
2.8 Restoring central heating system
pressure.....................................................12
2.9 System draining.......................................12
2.10 Anti-freeze protection. ..........................12
2.11 Case cleaning...........................................12
2.12 Decommissioning. ..................................12
3 Boiler start-up (initial check) ................13
3.1 Hydraulic diagram. .................................13
3.2 Wiring diagram.......................................14
3.3 Troubleshooting. .....................................14
3.4 Converting the boiler to other
types of gas...............................................15
3.5 Checks following conversion to
another type of gas..................................15
3.6 Possible adjustments of the gas valve. ..15
3.7 Programming the P.C.B..........................16
3.8 Automatic slow ignition function
with timed ramp delivery.......................17
3.9 “Chimney sweep function” ....................17
3.10 Pump anti-block function......................17
3.11 three-way anti-block function...............17
3.12 Radiators anti-freeze function...............17
3.13 P.C.B. periodical self-check....................17
3.14 Yearly appliance check and
maintenance.............................................17
3.15 Casing removal........................................18
3.16 Heat output. .............................................18
3.17 Combustion parameters.........................19
3.18 Technical data..........................................19
3.19 Key for Data plate....................................20
USER pageINSTALLER page MAINTENANCE TECHNICIAN page

4
INSTALLERUSER
MAINTENANCE TECHNICIAN
1BOILER INSTALLATION
1.1 INSTALLATION
RECOMMENDATIONS.
e Nike Mini 28 kW Special boiler has been
designed for wall mounted installation only,
for heating rooms and for the production of
domestic hot water, for domestic use and similar
purposes.
e wall surface must be smooth, without any
protrusions or recesses enabling access to the
rear part. ey are not designed to be installed
on plinths or oors (Fig. 1-1).
Only professionally enabled heating/plumbing
technicians are authorised to install Immergas
gas appliances. Installation must be carried
out according to regulation standards, current
legislation and in compliance with local
technical regulations and the required technical
procedures.
Before installing the appliance, ensure that it
is delivered in perfect condition; if in doubt,
contact the supplier immediately. Packing
materials (staples, nails, plastic bags, polystyrene
foam, etc.) constitute a hazard and must be kept
out of the reach of children. If the appliance
is installed inside or between cabinets, ensure
sucient space for normal servicing; therefore
it is advisable to leave clearance of at least 3
cm between the boiler casing and the vertical
sides of the cabinet. Leave adequate space above
the boiler for possible water and ue removal
connections. It is just as important that the intake
grids are not obstructed. Keep all ammable
objects away from the appliance (paper, rags,
plastic, polystyrene, etc.). Do not place household
appliances underneath the boiler as they could
be damaged if the safety valve intervenes (if not
conveyed away by a draining funnel), or if there
are leaks from the connections; on the contrary,
the manufacturer cannot be held responsible for
any damage caused to the household appliances.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o immediately
and contact a qualified technician (e.g. the
Immergas Technical Assistance centre, which
has specically trained sta and original spare
parts) Do not attempt to modify or repair the
appliance alone. Failure to comply with the above
implies personal responsibility and invalidates
the warranty.
•Installationregulations:
- these boilers cannot be installed in bedrooms,
studio ats and bathrooms. ey also cannot
be installed in rooms with wood (or solid
fuel) burning heat generators and in adjacent
and communicating rooms.
- Installation in places with a fire risk is
prohibited (for example: garages, closed
parking stalls), gas appliances and relative ue
ducts, ue exhaust pipes and combustion air
intake pipes.
- Installation is prohibited on the vertical
projection of cooking hobs.
- Installation is also prohibited in places/
environments that constitute common parts
of oce condominiums such as stairs, cellars,
entrance halls, attics, los, escape routes,
etc. if they are not located inside technical
compartments under the responsibility of
each individual building and only accessible
to the user (for the features of the technical
compartments, see the technical standards 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
harmful for the components of the appliance
and jeopardise operation.
- ey must also be installed in rooms where
the temperature cannot fall below 0°C and
must not be exposed to weathering.
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 mounting brackets or xing
template to x the appliance to the wall; they only
ensure adequate support if inserted correctly
(according to technical standards) in walls made
of solid or semi-hollow brick or block. In the
case of walls made from hollow brick or block,
partitions with limited static properties, or in any
case walls other than those indicated, a static test
must be carried out to ensure adequate support.
N.B.: the hex head screws supplied in the blister
pack are to be used exclusively to x the relative
mounting bracket to the wall.
ese boilers are used to heat water to below
boiling temperature in atmospheric pressure.
ey must be connected to a central heating
system and hot water circuit suited to their
performance and capacity.
Fig. 1-1
YES NO

5
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.2 MAIN DIMENSIONS.
Fig. 1-2
Key:
G - Gas supply
AC - Domestic hot water outlet
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)
785 450 310
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
1.3 CONNECTIONS OPTIONAL.
Gas connection (appliance category II2H3+).
Our boilers are designed to operate with methane
gas (G20) and LPG. Supply pipes must be the
same as or larger than the 3/4”G boiler tting.
Before connecting the gas line, carefully clean
inside all the fuel feed system pipes to remove any
residue that could impair boiler eciency. Also
make sure the gas corresponds to that for which
the boiler is prepared (see boiler data-plate).
If dierent, the appliance must be converted
for operation with the other type of gas (see
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 following
the mounting instructions illustrated in the
figure. The gas supply pipe must be suitably
dimensioned according to current regulations
in order to guarantee correct gas ow to the
burner even in conditions of maximum generator
output and to guarantee appliance efficiency
(technical specications). e coupling system
must conform to standards.
Fuel gas quality. The appliance has been
designed to operate with combustible gas free of
impurities; otherwise it is advisable to t special
lters upstream of the appliance to restore the
purity of the fuel.
Storage tanks (in case of supply from LPG
depot).
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance casing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.

6
CAVO ALIMENTAZIONE
INSTALLERUSER
MAINTENANCE TECHNICIAN
Hydraulic connection.
Attention: in order not to void the condensation
module warranty, before making the boiler
connections, carefully wash the heating system
(pipes, radiators, etc.) with special pickling or
descaling products to remove any deposits that
could compromise correct boiler operation.
A chemical treatment of the thermal system
water 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.
Water connections must be made in a rational
way using the couplings on the boiler template.
e boiler safety valve outlet must be connected
to a draining funnel. Otherwise, the manufacturer
declines any responsibility in case of ooding if
the drain valve cuts in.
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 .
Electrical connection: e Nike Mini 28 kW
Special 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: Immergas S.p.A. declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an
ecient earth system or failure to comply with
the reference standards.
Also ensure that the electrical installation
corresponds to maximum absorbed power
specications as shown on the boiler data-plate.
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; , this network must also have a
multi-pole circuit breaker with class III over-
voltage category. When replacing the power
supply cable, contact a qualied technician (e.g.
the Immergas Aer-Sales Technical Assistance
Service). e power cable must be laid as shown
(Fig. 1-3). 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.
1.4 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. 1-4)
All Immergas chrono-thermostats are connected
with 2 wires only. Carefully read the user and
assembly instructions contained in the accessory
kit.
•On/Odigitalchrono-thermostat.echrono-
thermostat allows:
- set two room temperature value: one for
daytime (comfort temperature) and one for
nighttime (lower temperature);
- set a weekly programme with four daily
switch on and switch o times;
- select the required operating 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;
•ComandoAmicoRemotoRemoteControl
Device V2 (CARV2) with climate chrono-
thermostat function. In addition to the
functions described in the previous point, the
CARV2 panel enables the user to control all the
important information regarding operation
of the appliance and the heating system with
the opportunity to easily intervene on the
previously set parameters, without having
to go to where the appliance is installed.
e panel is provided with self-diagnosis to
display any boiler functioning anomalies.
e climate chrono-thermostat incorporated
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 chrono-thermostat is fed
directly by the boiler by means of the same 2
wires used for the transmission of data between
boiler and chrono-thermostat.
CARV2 or chrono-thermostat On/O electric
connection (Optional). e operations described
below must be performed aer having removed
the voltage from the appliance. Any On/O room
chrono-thermostat 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 P.C.B. would be damaged.
Any CARV2 must be connected to clamps 40 and
41 eliminating jumper X40 on the circuit board,
paying attention not to invert the polarity in the
connections (Fig. 3-2). 3-2). Connection with
the wrong polarity prevents functioning, but
without damaging the CARV2 e boiler can only
be connected to one remote control.
Important: if the 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.
Fig. 1-3 Fig. 1-4
POWER SUPPLY CABLE

7
45
31
58
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.5 EXTERNAL PROBE OPTIONAL.
e boiler is designed for the application of the
Room ermostat (Fig. 1-5) which is available as
an optional kit. Refer to the relative instruction
sheet for positioning of the external probe.
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
flow temperature and outdoor temperature
is determined by the position of the selector
switch on the boiler control panel according to
the curves shown in the diagram (Fig. 1-6). e
electric connection of the external probe must be
made on clamps 38 and 39 on the boiler P.C.B.
(Fig. 3-2).
1.6 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
sources of pollution. Natural air flow is also
allowed indirectly by air intake from adjoining
rooms. For further information relative to
ventilation of the rooms follow that indicated
by the standards in force and the following
modications and integrations.
Evacuation of foul air. In the rooms where
the gas appliances are installed it may also be
necessary, as well as the intake of combustion
agent air, to evacuate foul air, with consequent
intake of a further equal amount of clean air. is
must be realised respecting the provisions of the
technical regulations in force.
1.7 FLUE DUCTS.
e gas appliances with attachment for the ue
gas discharge pipe must have direct connection
to chimneys or safely ecient ues.
The combustion products can be discharged
directly outside only if these are missing, as long
as the standard regulations for the ue terminal
are respected as well as the existing laws.
Connection to chimneys or flues. The
connection of the appliances to a chimney or
ue takes place by means of ue ducts.
In the event of ttings with pre-existing ues, these
must be perfectly clean because the detachment
of any waste from the walls during functioning,
could block the passage of ue gases, thus causing
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 regulation.
1.8 FLUES/CHIMNEYS.
For the appliances with natural draught
individual chimneys and branched flues can
be used.
Individual chimneys. e individual ues must
be dimensioned with respect to the standard
in force.
Branched ues. In buildings with lots of oors,
branched flues can be used for the natural
draught evacuation of combustion products. New
ues must be designed following the calculation
method and provisions of the regulation.
Chimney caps. e chimney cap is a device
positioned on the top of an individual chimney
or branched collective ue. is device promotes
the dispersion of combustion products, even in
adverse weather conditions, and prevents the
deposit of foreign bodies.
It must satisfy the requisites set forth in the
relative regulation.
e outlet quota, corresponding to the top of the
chimney/ue, independently of any caps, must
be out of the “backow area”, in order to prevent
the formation of counter-pressures that impede
the free discharge of the combustion products
into the atmosphere. It is therefore necessary
to use the minimum heights indicated in the
gures stated in the regulation, depending on
the slope of the roof.
Direct exhaust outside. e natural draught
appliances, envisioned to be connected to a
chimney or a ue, can discharge the combustion
products directly to the outside, through a
pipe passing through the perimeter walls of
the building. In this case discharge takes place
through an exhaust ue, which is connected to
a draught terminal at the outside.
Exhaust flue. The exhaust flue must be in
compliance with the same requisites listed for
the ue ducts, with further provisions stated in
the regulation in force.
Positioning the draught terminals. e draught
terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum
distances specified in current technical
standards.
Fume exhaust of forced draught appliances
in closed open-top environments. In spaces
closed on all sides with open tops (ventilation
pits, courtyards etc.), direct flue gas exhaust
is allowed for natural or forced draught gas
appliances with a heating power range from 4 to
35 kW, provided the conditions as per the current
technical standards are respected.
Important: it is prohibited to put the fumes
exhaust control device out of order voluntarily.
Every piece of this device must be replaced using
original spare parts if they have deteriorated. In
the case of repeated interventions of the fumes
exhaust control device, check the fumes exhaust
ue and the ventilation of the room in which the
boiler is located.
Fig. 1-5 Fig. 1-6
Position of the central heating
temperature user adjustment

8
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.9 SYSTEM FILLING.
Once the boiler is connected, proceed with
system filling via the filling 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 when only water escapes from them.
Close the lling valve when the boiler pressure
gauge indicates approx. 1.2 bar.
N.B.: during these operations start up the
circulation 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.
1.10 GAS SYSTEM STARTUP.
To start up the system, make reference to the
Standard: is divides the systems and therefore
the start-up operations into three categories: new
systems, modied systems, re-activated systems.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open ames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to specications.
1.11 BOILER STARTUP IGNITION.
To issue the required Declaration of Conformity,
the following must be performed for boiler
start-up:
- check that the internal system is properly sealed
according to the regulations in force;
- make sure that the type of gas used corresponds
to boiler settings;
- 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. 3.16);
- 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
functioning of fans;
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative
intervention time;
- check activation of the main switch located
upstream of the boiler.
e boiler must not be started up even if only
one of the checks should be negative.
N.B.: e preliminary boiler check must be carried
out by a qualied technician. e standard boiler
warranty is valid from the date of inspection.
e test certicate and warranty is issued to the
user.
Fig. 1-7
Head available to the system.
1.12 CIRCULATION PUMP.
e boilers are supplied with a built-in circulation
pump with 3-position electric speed control.
e boiler does not operate correctly with the
circulation pump on rst speed.
To ensure optimal boiler operation, in the case
of new systems (single pipe and module) it is
recommended to use the pump at maximum
speed. e circulation pump is already tted
with a capacitor.
Pump release. If, aer a prolonged period of
inactivity, the circulation pump is blocked,
unscrew the front cap and turn the motor sha
using a screwdriver. Take great care during this
operation to avoid damage to the motor.
1.13 KITS AVAILABLE ON REQUEST.
•Systemcut-off valveskit(onrequest).The
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.
•Zonesystemkit (onrequest).Iftheheating
system is to be divided into several zones (max.
three), in order to interlock them with separate
adjustments and to keep water ow rate high
for each zone, Immergas supplies zone system
kits by request.
•Polyphosphatedispenser kit(on request).
The polyphosphate 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.
Head (m H2O)
A = Head available to the plant at the third speed (with automatic by-pass)
B = Head available to the plant at the second speed (with automatic by-pass)
Flow rate (l/h)
Head (kPa)
A
B

9
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.14 BOILER COMPONENTS.
Fig. 1- 8
Key:
1 - Burner
2 - Domestic hot water ow switch
3 - Gas valve
4 - System lling valve
5 - Flue safety thermostat
6 - Fumes hood
7 - Delivery probe
8 - Safety thermostat
9 - System expansion vessel
10 - Combustion chamber
11 - Boiler circulator pump
12 - 3 bar safety valve
13 - Automatic by-pass
14 - ree-way valve (motorised)
15 - System draining valve
16 - Primary heat exchanger
17 - Ignition and detection electrodes
18 - Vent valve
19 - DHW heat exchanger
N.B.: connection group (optional)

10
INSTALLERUSER
MAINTENANCE TECHNICIAN
2INSTRUCTIONS FOR USE AND MAINTENANCE
2.1 CLEANING AND MAINTENANCE.
Attention: the heating systems must undergo
periodical maintenance (regarding this, see
the section dedicated to the maintenance
engineer, relating to “yearly appliance check
and maintenance”) and regular energy eciency
checks in compliance with national, regional or
local provisions in force.
is ensures that the optimal safety, performance
and operation characteristics of the boiler remain
unchanged over time.
We recommend stipulating a yearly cleaning and
maintenance contract with your zone technician.
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, chimneys
and caps are stated in Par. 1.6, 1.7 and 1.8. If
in doubt regarding correct ventilation, refer to
professional, qualied sta.
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 flue extraction and relative accessories,
switch o the appliance and on completion of
operations ensure that a qualied technician
checks eciency of the ducting or other devices.
Never clean the appliance or connected parts
with easily ammable substances.
Never leave containers or ammable substances
in the same environment as the appliance.
It is prohibited and dangerous to obstruct the air
intake, even partially, for the ventilation of the
room in which the boiler is installed.
Due to the danger, functioning is also prohibited
in the same room as suction devices, chimneys
or similar at the same time as the boiler unless
there are additional openings dimensioned in a
way to satisfy the further necessity for air. For the
dimensioning of these additional openings, refer
to qualied technical sta. In particular, an open
re must have its own air supply.
On the contrary, the boiler cannot be installed
in the same room.
•Attenzione: the use of components involving
use of 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
appliance exposed to weathering (rain,
sunlight, etc.);
- the appliance power cable must not be
replaced 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.
2.4 CONTROL PANEL.
Fig. 2-1
Key:
1 - Flame presence LED
2 - Domestic hot water LED
3 - Heating LED
4 - Temperature LED – Insucient circulation anomaly
5 - Temperature LED – Flow probe anomaly
6 - Temperature LED – Ignition block anomaly
7 - Temperature LED – Overheating block
8 - Temperature LED - Flue gas pressure switch block
9 - Stand-by-Domestic water / Remote Control - Domestic water
and Heating-Reset Selector
10 - Domestic hot water temperature selector
11 - Central heating temperature selector
12 - Boiler pressure gauge

11
INSTALLERUSER
MAINTENANCE TECHNICIAN
2.5 IGNITION OF THE BOILER.
Before ignition make sure the central heating
system is lled with water and that the pressure
gauge (12) indicates a pressure of 1 - 1.2 bar;
- Open the gas cock upstream from the boiler.
- Turn the main selector switch (9) to Domestic
Hot Water/Comando Amico RemotoV2
(CARV2) ( ) or Domestic Hot Water
and Central heating( ).
N.B.: Once the main selector switch has been
placed (9) on one of these positions, the presence
of voltage is indicated by the switch-on with a
xed light of one of the LEDS from 4 to 8, which
indicate the temperature of the output water from
the main heat exchanger.
Attention: if any one of the LEDs 4 to 8 starts
ashing, this means that there is a fault. Refer to
the next paragraph.
Functioning of the boiler in domestic water mode
and in heating mode is indicated respectively by
the switch-on of LED 2 or LED 3 with a xed light
(in absence of remote controls).
•Operationwith RemoteControl(Optional).
With selector switch (9) in position (
) and Remote Control connected to the boiler
selector switches (10) and (11) excluded. e
boiler adjustment parameters are set from the
control panel of the Remote Friend Control.
Connection to the Remote Control is indicated
by the contemporary xed switch-on of LEDs
2 and 3 ( ). Also in the presence
of Remote Control the indications of the
temperature and any faults are maintained on
the control panel.
• Operation without Remote Control. With
the selector switch (9) in position ( )
the heating adjustment selector switch (11) is
cut out, the domestic hot water temperature
is regulated by selector switch (10). With
the selector switch in position ( ) the
heating adjustment selector switch (11) is used
to regulate the temperature of radiators, while
selector (10) continues to be used for domestic
hot water. Turn the selector switches clockwise
to increase the temperature and anti-clockwise
to decrease it.
From this moment the boiler functions
automatically. 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 (LED corresponding to the ignited boiler
temperature). Each time the boiler lights up, the
relative ame present symbol is displayed by the
green LED 1 ( ).
N.B.: e boiler may start-up automatically if the
anti-freeze function is activated.
2.6 TROUBLESHOOTING.
e Nike Mini 28 kW Special boiler signals an
anomaly by ashing of one of the LEDs from 4
to 8 or LEDs 1 and 2 coupled to LED 7. e error
code will be displayed on any remote control by
a numerical code preceded or followed by the
letter E (e.g. CARV2 = Exx).
Anomaly signalled LED
ashing Remote display
Insucient circulation LED 4 ( ) 27
Flow probe anomaly LED 5 ( )05
No ignition block LED 6 ( )01
Safety thermostat block (over-
temperature) LED 7 ( )02
Flue safety thermostat block LED 8 ( )03
Contacts resistance block LEDs 2 ( ) and 7 ( ) ash at the
same time 04
Parasite ame block LEDs 1 ( ) and 7 ( ) ash at the
same time 20
Loss of remote control
communication
LEDs 2 and 3 ash alternately
()31
Insufficient water circulation. This occurs
if there is overheating in the boiler due to
insufficient water circulating in the primary
circuit; the causes can be:
- low system circulation; check that no shut-o
devices are closed on the heating circuit and
that the system is free of air (deaerated);
- pump blocked; free the pump.
If this phenomenon occurs frequently, contact a
qualied technician for assistance (e.g. Immergas
Aer-Sales Technical Assistance Service).
Delivery probe anomaly. If the board detects an
anomaly on the system NTC ow probe (code
05) the boiler will not start; contact a qualied
technician for assistance (e.g. Immergas Aer-
Sales Technical Assistance Service).
Ignition block. The boiler lights up with
each demand for room heating or hot water
production. If the burner does not ignite within
10 seconds, the boiler remains in stand-by
for 30 seconds, tries again and if the second
attempt fails it goes into “ignition block” (LED
6 ashing). To eliminate “ignition block” the
main selector (9) must be temporarily turned
to the Reset position. e anomaly can be reset
5 consecutive times, aer which the function is
inhibited for at least one hour. It is possible to try
once every hour, for a maximum of 5 attempts.
By switching the appliance on and off the 5
attempts are re-acquired. On commissioning
or aer extended appliance downtime, it may
be necessary to eliminate the “ignition block”.
If this phenomenon occurs frequently, contact a
qualied technician for assistance (e.g. Immergas
Aer-Sales Technical Assistance Service).
Safety thermostat block (overheating). During
operation, if a fault causes excessive overheating
internally, in the exhaust, or an anomaly occurs
in the flame control section, an overheating
block is triggered in the boiler (LED 7 ashing).
To eliminate the “overheating block” the main
selector (9) must be temporarily turned to the
Reset position. If this phenomenon occurs
frequently, contact a qualied technician for
assistance (e.g. Immergas Aer-Sales Technical
Assistance Service).
Flue safety thermostat block. is occurs if
the fumes evacuation pipe does not function
correctly. The boiler goes into stand-by for
30 minutes, after which, if normal working
conditions are restored, it re-starts without
having to be reset. In the case of 3 consecutive
blocks, the boiler itself blocks and it must be reset
in order to re-start. It is nevertheless necessary to
call a qualied technician (e.g. Immergas Aer-
Sales Technical Assistance Service) in order to
solve the problem.
Contacts resistance block. is occurs in the
case of faults to the safety thermostat over-
temperature). e boiler does not start and a
technician must be called (e.g. Immergas Aer-
Sales Service).
Parasite ame block. is occurs in case of a
leak on the detection circuit or anomaly in the
flame control unit. The boiler does not start
and a technician must be called (e.g. Immergas
Aer-Sales Service).

12
1
2
3
4
INSTALLERUSER
MAINTENANCE TECHNICIAN
Loss of remote control communication. is
occurs if an incompatible remote control is
connected, or if communication between the
boiler and CARV2 is lost. Try the connection
procedure again by turning the boiler o and
turning the selector switch (9) to position (
). If the CARV2 is still not detected on re-
starting the boiler will switch to local operating
mode, i.e. using the controls on the boiler itself.
If this phenomenon occurs frequently, contact a
qualied technician for assistance (e.g. Immergas
Aer-Sales Technical Assistance Service).
Signalling and diagnostics - Display on Remote
Friend Control screen (optional). During
normal boiler operation the room temperature
value is displayed on the remote control screen
(CARV2); in case of malfunction or anomaly, the
temperature value is replaced by the relative error
code provided in table on page 11.
Attention: if the boiler is in stand-by “ ” code
error “CON” will be displayed on CARV2. e
remote controls are powered constantly so as not
to loose the memorised programs.
2.7 BOILER SHUTDOWN
Disconnect the main selector switch (9) by
placing it on “ ” (LEDs 1 to 8 are off),
disconnect the external omni-polar switch to
the boiler and close the gas cock upstream of the
appliance. Never leave the boiler switched on if
le unused for prolonged periods.
2.8 RESTORING 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 falls below 1 bar (with the circuit
cold) restore normal pressure via the valve located
at the bottom of the boiler (Fig. 2-2).
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 contact a professional technician
for assistance.
In the event of frequent pressure drops, contact
qualified staff for assistance to eliminate the
possible 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 is equipped with an antifreeze
function, as per standard, that activates pump
and burner operation when the temperature
of the water inside the boiler falls below 4°C
and stops when it reaches 42°C. e antifreeze
function is only guaranteed if the boiler is
fully operative, is not in "block" status and is
electrically powered with the main selector on
Summer or Winter. To avoid keeping 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.
Fig. 2-2
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 professional sta for the procedures and
ensure that the electrical, water and gas supply
lines are shut o and disconnected.
Bottom view.
Key:
1 - System draining valve
2 - System lling valve
3 - Cold water inlet valve
4 - Gas cock
N.B.: connection group (optional)

13
INSTALLERUSER
MAINTENANCE TECHNICIAN
3BOILER STARTUP INI TIAL CHECK
To commission the boiler:
- make sure that the declaration of conformity
for installation is supplied with the appliance;
- 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 pressure gauge 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. 3.16);
- make sure the gas supply failure safety device is
working, within its relative intervention time;
- check activation of the main switch located
upstream of 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
functioning of fans;
- ensure activation of all adjustment devices;
- seal the gas ow rate regulation devices (if
settings are modied);
- check the production of domestic hot water;
- check sealing eciency of water circuits;
- check ventilation and/or aeration of the
installation room where required.
3.1 HYDRAULIC DIAGRAM.
Fig. 3-1
If even only a single safety check oers a negative
result, do not commission the system.
Key:
1 - Domestic hot water ow switch
2 - Flow limiter
3 - System lling valve
4 - Gas valve
5 - Burner
6 - Primary heat exchanger
7 - Fumes hood
8 - Flue safety thermostat
9 - Delivery probe
10 - Safety thermostat
11 - System expansion vessel
12 - Vent valve
13 - Boiler circulator pump
14 - DHW heat exchanger
15 - ree-way valve (motorised)
16 - Automatic by-pass
17 - System draining valve
18 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
R - System return
M - System ow

14
1
2
3 4 5
7
6
8
7 7
9 9
10 10
11 11
12 12
8 7
7 8
10
12
9
13
14
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.2 WIRING DIAGRAM.
Fig. 3-2
Key:
A5 - CARV2 interface board
B1 - Flow probe
B4 - External probe (optional)
CARV2 - Comando Amico Remoto remote
control V2 (optional)
E1 - Ignition electrodes
E2 - Detection electrode
E4 - Safety thermostat
E6 - Flue safety thermostat
F1 - Neutral fuse
X40 - Room thermostat jumper
Y1 - Gas valve
Y2 - Gas valve modulator
1 - Primary
2 - Secondary
3 - Power supply 230Vac 50Hz
4 - Auxiliary outlet 230Vac 50Hz
max. 2A
5 - Zones control unit
6 - Yellow/Green
7 - Blue
8 - Brown
9 - Red
10 - Black
11 - Grey
12 - White
13 - Central heating
14 - Domestic hot water
Remote Controls: the boiler is set-up for the
application of the Comando Amico Remoto
remote control V2 (CARV2) which must be
connected to clamps 42 and 43 of the X9
connector on the P.C.B. (respecting the polarity)
and eliminating jumper X40.
Room thermostat: the boiler is designed for
the application of the Room ermostat (S20).
Connect it to clamps 40 –41 eliminating jumper
X40.
Connector X12 (RS 232) is used for automatic
inspection for connection to the personal
computer.
3.3 TROUBLESHOOTING.
N.B.: Maintenance must be carried out by a
qualied technician (e.g. Immergas Technical
Aer-Sales Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing eciency of gas intake
circuit.
- Irregular combustion (red or yellow ame).
Can be caused by: dirty burner, clogged
lamellar pack, intake - exhaust terminal not
installed properly. Clean the above components
and ensure correct installation of the terminal.
- Frequent interventions of the over heating
safety thermostat. It can depend on reduced
water pressure in the boiler, little circulation
in the heating system, the blocked pump or
an anomaly of the boiler P.C.B. Check on the
pressure gauge that the system pressure is
within established limits. Check that radiator
valves are not all closed.
- e boiler produces condensate. is can be
caused by obstructions of the chimney or ues
with height or section not proportioned to the
boiler. It can also be determined by functioning
at boiler temperatures that are excessively low.
In this case, make the boiler run at higher
temperatures.
- Frequent interventions of the flue 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). In
this case the boiler waits for 30 minutes, before
trying to start up again. To exclude the meter,
cut the voltage o by temporarily disconnecting
the electrical power supply plug.
- Presence of air in the system. Check opening of
the special air vent valve cap (Fig. 1-8). Make
sure the system pressure and expansion vessel
factory-set pressure values are within the set
limits; the factory-set 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 1.3 (electric connection).
F2 - Line fuse
M1 - Boiler circulator pump
M30 - ree-way valve
R5 - Domestic hot water temperature
trimmer
R6 - Central heating temperature trimmer
R10 - Main selector
S4 - Domestic hot water ow switch
S8 - Gas type selector
S20 - Room thermostat (optional)
T2 - Ignition transformer

15
43
2
1
56
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.4 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
If the appliance needs 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 technician (e.g. Immergas Aer-Sales
Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- disconnect 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;
- move jumper 16 (Fig. 3-3) to the correct
position for the type of gas in use (Methane or
L.P.G.);
- to access adjustments on the circuit board, the
cover must be removed from the dashboard by
taking out the rear xing screws;
- re-power the appliance;
- adjust the maximum heat power of the boiler;
- adjust the minimum heat power of the boiler;
- adjust (if necessary) the heating power;
- seal the gas ow rate regulation devices (if
settings are modied);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near
the data-plate. Using an indelible marker pen,
cancel the data relative to the old type of gas.
These adjustments must be made based on
the type of gas used, following the indications
provided in the tables (Par. 3.16).
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 technician (e.g.
Immergas After-Sales Technical Assistance
Service).
Burner adjustment must be carried out using a
"U" or digital pressure gauge connected to the
gas valve outlet pressure point (Part. 4 Fig. 3-3),
keeping to the pressure value provided in the
tables (Par. 3.16) according to the type of gas for
which the boiler is prepared.
Fig. 3-3
P.C.B.SIT 845 GAS Valve
10 - Phase fuse 3.15AF
11 - Neutral fuse 3.15AF
12 - Main switch
13 - Domestic hot water temperature trimmer
14 - RS232 computer interface
15 - Central heating temperature trimmer
16 - METHANE L.P.G. gas type selector
3.6 POSSIBLE ADJUSTMENTS OF THE
GAS VALVE.
•Adjustmentofboilernominalheatoutput(see
previous gure).
- Turn the domestic hot water temperature
selector (10 Fig. 2-1) to maximum;
- open the domestic hot water cock in order to
prevent modulation from starting up;
- adjust the nominal boiler power from the brass
nut (3), keeping to the maximum pressure
values provided in the tables (Par. 3.16)
depending on the type of gas;
- by turning it clockwise the heating potential
increases and by turning it anti-clockwise the
heating potential decreases.
•Adjustmentofminimumboilerheatoutput
(Fig. 3-3).
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);
- disconnect the power supply to the modulating
coil (just disconnect a faston); by turning the
screw in a clockwise direction, the pressure
increases, and counter-clockwise it decreases.
On completion of calibration, re-apply the
power supply to the modulating coil. The
minimum boiler power must not be adjusted
to a pressure value below the levels stated in the
tables (Par. 3.16) depending on the type of gas.
N.B.: to adjust the gas valve, remove the plastic
cap (6); aer the adjustment, put the cap back on.
Key:
1 - Coil
2 - Minimum power adjustment screw
3 - Maximum power adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection hood

16
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.7 PROGRAMMING THE P.C.B.
e Nike Mini 28 kW Special 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, do the
following: place the main selector on Reset for
an amount of time ranging between 15 and 20
seconds (aer approx. 10 sec. LEDs 2 and 3 will
start ashing simultaneously. Wait for this to stop
and then place the main selector on DHW and
Central Heating). At this point, place the main
selector switch back on domestic hot water-
heating ( ).
When the programming phase has been
activated, enter the rst level where it is possible
to choose the parameter to be set.
The parameter is marked by one of the fast
ashing LEDs between 1 and 8 (Fig. 2-1).
The selection is made by turning the DHW
temperature selector (10). For association of the
LED to the parameter, see the following table:
List of parameters
Flashing
LED
(fast)
Minimum CH output (DO NOT
USE) LED 1
Maximum CH output (DO NOT
USE) LED 2
Central heating ignitions timer LED 3
Heating power output ramp LED 4
Heating switch-on delay request
from Room thermostat and
Comando Amico Remoto remote
control V2
LED 5
DHW thermostat LED 6
Pump functioning LED 7
Functioning gas LED 8
Boiler mode (DO NOT USE) (it
establishes whether the boiler
operates in instantaneous or
storage mode)
LEDs 8
and 1
Once the parameter to be modied has been
selected, conrm by turning the main selector
switch to Reset momentarily until the LED
relative to the parameter switches-off, then
release.
Given the OK for selection, pass to the second
level where it is possible to set the value of the
parameter selected. e value is indicated by the
slow ashing of one of the LEDs between 1 and
8. e value is selected by turning the central
heating temperature selector (11).
Once the value of the parameter to be modied
has been selected, confirm the selection by
momentarily turning the main selector switch
onto Reset momentarily until the LED relative to
the parameter switches o, then release.
Programming mode is exited if no operation is
carried out for 30 seconds or if the main selector
switch is positioned at OFF from the “parameter
setting” level.
For association of the LED to the relative value,
see the following tables:
Heating output. e boiler is produced and
calibrated in the central heating phase at nominal
output.
Permanent reduction of the timer. e boiler
has an electronic timing device that prevents the
burner from igniting too oen in the heating
phase. e boiler has a standard supply of a timer
adjusted at 180 seconds.
Heating switch-on timer
(continuous variation)
Flashing
LED
(slow)
30 seconds LED 1
55 seconds LED 2
80 seconds LED 3
105 seconds LED 4
130 seconds LED 5
155 seconds LED 6
180 seconds (Standard setting) LED 7
255 seconds LED 8
Central heating ramp timing. The boiler
distributes the maximum power set in the
previous parameter. The boiler performs an
ignition ramp of about 650 seconds to arrive
from minimum power to nominal heating power.
Central heating ramp timer
(continuous variation)
Flashing
LED
(slow)
65 seconds LED 1
130 seconds LED 2
195 seconds LED 3
390 seconds LED 4
455 seconds LED 5
520 seconds LED 6
585 seconds LED 7
650 seconds (standard setting) LED 8
Heating switch-on delay request from Room
thermostat and Comando Amico Remoto V2 .
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 may be necessary to delay ignition.
Heating switch-on delay request
from Room thermostat and
Comando Amico Remoto
remote control V2 (continuous
variation)
Flashing
LED
(slow)
0 seconds (Standard setting) LED 1
54 seconds LED 2
131 seconds LED 3
180 seconds LED 4
206 seconds LED 5
355 seconds LED 6
400 seconds LED 7
510 seconds LED 8
DHW thermostat. With the “correlated”
thermostat setting the switch-o of the boiler
takes place on the basis of the temperature set
using the domestic hot water adjustment selector
switch (10). While with the setting of the "xed"
DHW thermostat the switch-o temperature is
xed at the maximum value independently from
the position of the selector switch.
DHW thermostat
Flashing
LED
(slow)
Correlated LED 1
Fixed (Standard setting) LED 8
Circulating pump function. Two circulating
pump operational modes can be selected in
heating phase.
In “intermittent” mode it is activated from the
room thermostat or from the remote control, in
“continuous” mode the pump always runs when
the main switch (9) is on CH.
Pump function
Flashing
LED
(slow)
Intermittent (Standard setting) LED 1
Continuous LED 8
Town Gas G110 – Industrial gas. e setting
of this function is used to adjust the boiler in
order to function with gases from the rst family.
Gas G110 - Industrial gas (rst
family gas)
Flashing
LED
(slow)
O (Standard setting) LED 1
On LED 8

17
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.8 AUTOMATIC SLOW IGNITION
FUNCTION WITH TIMED RAMP
DELIVERY.
In the ignition phase the P.C.B. carries out an
increasing gas delivery ramp (with pressure
values that depend on the type of gas selected)
with preset duration. This prevents every
calibration or precision adjustment of the boiler
ignition phase in any conditions of use.
3.9 "CHIMNEY SWEEP FUNCTION"
When activated, this function forces the boiler
at max. output for 15 minutes.
In this state all adjustments are excluded and only
the safety thermostat and the limit thermostat
remain active. To activate the chimney sweep
function it is necessary to position the main
switch on Reset for a time between 8 and 15
seconds without DHW or CH requests. Its
activation is signalled by the simultaneous
ashing of the LEDs (2) and (3). is function
allows the technician to check the combustion
parameters. After the checks, deactivate the
function switching the boiler o and then on
again.
3.10 PUMP ANTIBLOCK FUNCTION.
e boiler has a function that starts the pump at
least once every 24 hours for the duration of 30
seconds in order to reduce the risk of the pump
becoming blocked due to prolonged inactivity.
3.11 THREEWAY ANTIBLOCK
FUNCTION.
Both in “domestic hot water” and in “domestic
hot water-central heating” phase the boiler is
equipped with a function that starts the three-
way motorised group 24 hours aer it was last
in operation, running it for a full cycle so as to
reduce the risk of the three-way group becoming
blocked due to prolonged inactivity.
3.12 RADIATORS ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.13 P.C.B. PERIODICAL SELFCHECK.
During functioning in heating mode or with
boiler in standby, the function activates every 18
hours aer the last boiler check/power supply. In
case of functioning in domestic hot water mode
the self-check starts within 10 minutes aer the
end of the withdrawing in progress, for duration
of approx. 10 seconds.
N.B.: during self-check, the boiler remains o,
including signalling.
3.14 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the draught-breaker/anti-wind
device for deterioration or corrosion.
- Check ignition and operation.
- Check correct calibration of the burner in
domestic hot water and central heating phases.
- Check the operation of the appliance control
and adjustment devices and in particular:
- intervention of the main electrical switch on
the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat
intervention.
- Check that the internal system is properly
sealed according to specications.
- Make sure the ionisation ame control gas
supply failure safety device is working. It must
start-up in less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valves
is not blocked.
- Check, aer discharging the system pressure
and bringing it to zero (read on boiler pressure
gauge), that the expansion vessel charge is at 1.0
bar.
- Check that the system static pressure (with
system cold and aer relling the system by
means of the lling valve) is between 1 and 1.2
bar.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- over-temperature safety thermostat;
- system pressure switch;
- ue thermostat.
- Check the condition and integrity of the
electrical system and in particular:
- electrical power cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.

18
2
3
4
11
5
INSTALLERUSER
MAINTENANCE TECHNICIAN
Fig. 3-4
3.15 CASING REMOVAL.
To facilitate boiler maintenance the casing can
be completely removed by following these simple
instructions (Fig. 3-4):
- Remove the lower grid (2) by taking out the 4
lower screws (1);
- remove the front (3) of the boiler by pushing it
upwards and pulling it towards yourself at the
same time to release it from the top hooks;
- tilt the control panel (4) towards you, taking
care to remove the 2 xing screws (5).
3.16 HEAT OUTPUT.
N.B.: gas ow rates refer to heating power below a
temperature of 15°C and a pressure of 1013 mbar.
Burner pressure values refer to use of gas at 15°C.
METHANE (G20) BUTANE (G30) PROPANE (G31)
THERMAL
POWER
THERMAL
POWER
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
(kW) (kcal/h) (m3/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O)
NOM.
OUTPUT 27,9 23994 3,27 12,00 122,4 2,44 27,70 282,5 2,40 35,90 366,1
MIN.
OUTPUT 10,5 9030 1,27 2,00 20,4 0,95 4,10 41,8 0,94 5,60 57,1

19
INSTALLERUSER
MAINTENANCE TECHNICIAN
- * Temperature adjustment with a domestic hot
water ow of 9.3l/min. with inlet temperature
of 15°C.
- Flue temperature values refer to an air inlet
temperature of 15°C.
- The data relating to domestic hot water
performance refer to a dynamic inlet pressure
of 2 bar and an inlet temperature of 15°C; the
values are measured immediately at the boiler
3.17 COMBUSTION PARAMETERS.
3.18 TECHNICAL DATA.
Nominal heat input kW (kcal/h) 30.9 (26571)
Minimum heat input kW (kcal/h) 12 (10356)
Nominal heat output (useful) kW (kcal/h) 27,9 (23994)
Minimum heat output (useful) kW (kcal/h) 10,5 (9030)
Eciency at nominal heat output % 90,3
Eciency at 30% nominal heat output load % 89,3
Heat loss at case with burner On/O % 3,60 / 1,07
Heat loss at ue with burner On/O % 6,10 / 0,24
Central heating circuit max. operating pressure bar 3
Central heating circuit max. operating temperature °C 90
Adjustable central heating temperature °C 38 - 85
System expansion vessel total volume l 4,5
Expansion vessel factory-set pressure bar 1
Water content in generator l 2,9
Head available with 1000 l/h ow rate kPa (m H2O) 25,9 (2,64)
Hot water production useful heat output kW (kcal/h) 27,9 (23994)
Domestic hot water adjustable temperature °C 38 - 77
Domestic hot water circuit ow limiter at 2 bar l/min 9,3
Domestic circuit min. pressure (dynamic) bar 0,3
Domestic hot water circuit max. working pressure bar 10
Minimum D.H.W. ow rate l/min 1,5
Specic ow rate (∆T 30°C) l/min 12,8
Flow rate capacity in continuous duty (∆T 30°C) l/min 13,2
Weight of full boiler kg 33,9
Weight of empty boiler kg 31,0
Electrical connection V/Hz 230/50
Nominal absorption A 0,44
Installed electric output W 100
Pump consumption W 77,4
Equipment electrical system protection - IPX4D
Boiler ue circuit resistance Pa 1,3
NOXclass - 3
Weighted NOXmg/kWh 125
Weighted CO mg/kWh 43,0
Type of appliance B11BS
Category II2H3+
G20 G30 G31
Gas nozzle diameter mm 1,30 0,78 0,78
Supply pressure mbar (mm H2O) 20 (204) 29 (296) 37 (377)
Flue ow rate at nominal heat output kg/h 73 70 72
Flue ow rate at min heat output kg/h 63 63 63
CO2at Q. Nom./Min. % 6,00 / 2,56 7,30 / 3,00 7,30 / 3,00
CO with 0% O2at Nom./Min. Q. Nom./Min. ppm 63 / 32 104 / 42 71 / 37
NOXat 0% of O2at Q. Nom./Min. mg/kWh 350 / 220 135 / 100 420 / 125
Flue temperature at nominal output °C 100 106 103
Flue temperature at minimum output °C 78 79 79
outlet, considering that to obtain the data
declared, mixing with cold water is required.
- The maximum sound level emitted during
boiler operation is < 55dBA. e sound level
value is referred to semianechoic chamber tests
with the boiler operating at max. heat output,
with extension of the ue gas exhaust system
according to product standards.

20
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.19 KEY FOR DATA PLATE.
Md Cod. Md
Sr N° CHK Cod. PIN
Type
Qnw/Qn min. Qnw/Qn max. Pn min. Pn max.
PMS PMW D TM
NOxClass
N.B.: the technical data is provided on the data plate on the boiler
IE
Md Model
Cod. Md Model code
Sr N° Serial Number
CHK Check
Cod. PIN PIN code
Type Type of installation (ref. CEN TR 1749)
Qnw min. Minimum DHW heat input
Qnmin. CH minimum heat input
Qnw max. DHW maximum heat input
Qnmax. CH maximum heat input
Pnmin. Minimum heat output
Pnmax. Maximum heat output
PMS Maximum system pressure
PMW Maximum domestic hot water pressure
DSpecic ow rate
TM Maximum operating temperature
NOxClass NOxClass