Immergas Avio 24 Kw User manual

AVIO
24 kW
*1.034467IE*
Instruction booklet and
warning IE

USER page
Immergas S.p.A. declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without forewarning.
INSTALLATOR page MAINTENANCE page
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 cu-
stomer 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 any interventions or routine
maintenance contact Immergas Authorised Centres: these have original spare parts and boast of specic preparation directly from the manufacturer .
General recommendations
All Immergas products are protected with packaging suitable for transport. e material must be stored in dry environments and protected from bad weather.
e instruction book is an integral and important part of the product and must be consigned to the user also in the case of transfer of ownership. It
must be kept well and consulted carefully, as all of the warnings supply important indications for safety in the installation, use and maintenance stages.
is instruction booklet contains technical information on how installing Immergas boilers. For other issues related to installation of boilers (i.e.: safety
in work sites, environment protection, injury prevention), comply with the laws in force and technical standards.
Installation and maintenance must be performed in compliance with the regulations in force, according to the manufacturer’s instructions and by profes-
sionally qualied sta, intending sta with specic technical skills in the plant sector, as envisioned by the Law.
Improper installation or assembly of Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to persons,
animals and objects. Read the provided product instructions carefully in order to install the product correctly
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 must be considered improper and therefore dan-
gerous. In the case of errors during installation, running and maintenance due to the failure to comply with the technical laws in force, standards or the
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
EC DECLARATION OF CONFORMITY
For the purpose and eect of the 2009/142/CE Gas Appliance Directive, 2004/108/CE EMC Directive, 92/42/CE Eciency Directive and 2006/95/CE
Low Voltage Directive.
e Manufacturer: Immergas S.p.A. v. Cisa Ligure n° 95 42041 Brescello (RE)
DECLARES THAT: the Immergas boiler model: Avio 24kW
is in compliance with the same European Community Directives Signature:
Mauro Guareschi
Research & Development Director
INDEX
1 Installation of the boiler ...........................3
1.1 Installation recommendations. ................3
1.2 Main dimensions. ......................................3
1.3 Attachments. ..............................................4
1.4 Remote controls and room
Chronothermostats (Optional). ..............5
1.5 External probe (optional). ........................5
1.6 Ventilation of the rooms...........................6
1.7 Fume ducts. ................................................6
1.8 Flues/chimneys. .........................................6
1.9 System lling. .............................................6
1.10 Gas system start-up. ..................................6
1.11 Start-up of the boiler (ignition). ..............6
1.12 Domestic hot water boiler device............6
1.13 Circulation pump. .....................................7
1.14 Kits available on request. ..........................7
1.15 Boiler components. ...................................8
2 Instructions for use and maintenance ....9
2.1 Cleaning and maintenance. .....................9
2.2 Ventilation of the rooms...........................9
2.3 General warnings ......................................9
2.4 Control panel. ............................................9
2.5 Ignition of the boiler. ..............................10
2.6 Fault and anomaly signals. .....................10
2.7 Boiler shutdown. .....................................10
2.8 Restoring heating system pressure. .......10
2.9 Draining the system.. ..............................11
2.10 Draining the boiler. .................................11
2.11 Anti-freeze protection. ...........................11
2.12 Case cleaning. ..........................................11
2.13 Decomissioning. ......................................11
3 Boiler commissioning (initial check) ...12
3.1 Hydraulic layout. .....................................12
3.2 Wiring diagram. ......................................13
3.3 Troubleshooting. .....................................13
3.4 Converting the boiler to other
types of gas ...............................................14
3.5 Checks following conversion to
another type of gas. .................................14
3.6 Possible adjustments of the gas valve. ..14
3.7 Programming the circuit board.............14
3.8 Fautomatic slow ignition function
with timed ramp delivery. ......................15
3.9 “Chimney sweep” function. ...................15
3.10 Pump anti-block function. .....................16
3.11 ree-way anti-block system. ................16
3.12 Radiator anti-freeze function. ...............16
3.13 Electronic card periodical self-check. ..16
3.14 Casing removal. .......................................16
3.15 Yearly appliance check and
maintenance. ............................................16
3.16 Variable heat power. ................................17
3.17 Combustion parameters. ........................17
3.18 Technical data. .........................................18

1-1
1-2
3 - IE
INSTALLATORUSERMAINTENANCE
YES NO
Height
(mm)
Width
(mm)
Depth
(mm)
900 580 380
ATTACHMENTS
GAS PLANT DOMESTIC
HOT WATER
G R M AC AF
1/2” 3/4” 3/4” 1/2” 1/2”
1.2 MAIN DIMENSIONS.
Key:
G - Gas supply
R - System return
M - System delivery
RC - Domestic hot water re-circ.
AC - Domestic hot water outlet
AF - Domestic hot water inlet
V - Electric attachment
1 INSTALLATION OF THE BOILER
1.1 INSTALLATION
RECOMMENDATIONS.
Only professionally qualied heating/plumbing
technicians 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.
Before installing the appliance, ensure that it is
delivered in perfect condition; if in doubt, contact
the supplier immediately.
e installation site and relative Immergas ac-
cessories must have suitable characteristics (both
technical and structural), in order to allow (al-
ways in safe, eciency and easiness conditions):
- installation (according to the legislation and
technical standards in force);
- maintenance operations (including those
scheduled, periodical, ordinary and special);
- removal (to the outdoors in a place suitable
for loading and transporting appliances and
components) as well as any replacement with
equivalent appliances and/or components.
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 sufficient space for normal servicing;
therefore it is advisable to leave a clearance of
at least 3 cm between the boiler casing and the
vertical sides of the cabinet.
Leave adequate space above the boiler for
possible water and fume removal connections.
At least 60 cm must be le below the boiler
in order to guarantee replacement of the
magnesium anode.
It is just as important that the intake grids are
not obstructed.
Keep all flammable objects away from the
appliance(paper, rags, plastic, polystyrene, etc.).
Do not place household appliances underneath
the boiler as they could be damaged if the safety
valve intervenes (if not conveyed away by a
discharge funnel), or if there are leaks from the
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 personnel 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 have
been designed for wall mounted installation
only; they must be used to heat environments,
to produce domestic hot water and similar
purposes. e wall surface must be smooth,
without any protrusions or recesses enabling
access to the rear part. ey are NOT designed
to be installed on plinths or oors (Fig. 1-1).
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
(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.
These boilers are used to heat water to below
boiling temperature in atmospheric
pressure. ey must be connected to a heating
system and hot water circuit
suited to their performance and capacity.
ese boilers cannot be installed in bedrooms or
shower or bathrooms; they 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 damaging for the components
of the appliance and jeopardise functioning.
ey cannot be installed in rooms with open
res without their own air ow. ey must also
be installed in an environment in which the
temperature cannot fall below 0°C.
ey must not be exposed to atmospheric agents.
Anti-Legionella thermal treatment of the Im-
mergas storage tank (which can be activated
through the specic function present on the set
thermoregulation systems): during this phase,
the water temperature inside the storage tank ex-
ceeds 60 °C resulting in burns hazards. Keep this
DHW treatment under control (and inform the
users), to prevent unexpected damage to persons,
animals and objects. If required, a thermostatic
valve must be installed at the DHW outlet to
prevent burns.

4 - IE
INSTALLATORUSERMAINTENANCE
1.3 ATTACHMENTS.
Gas attachment (II2H3+ category appliance).
Our boilers are designed to operate with methane
gas (G20) and LPG. Supply pipes must be the
same as or larger than the 1/2”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, as insucient levels can reduce
generator output and cause malfunctions. Ensure
correct gas cock connection. The gas supply
pipe must be suitably dimensioned according to
current regulations in order to guarantee correct
gas ow to the boiler even in conditions of max.
generator output and to guarantee appliance
eciency (technical specications). e coupling
system must conform to standards.
Combustible gas quality.e appliance has been
designed to operate with gas free of impurities;
otherwise it is advisable to fit special filters
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
Hydraulic attachment.
Important: In order not to void the warranty
before making the boiler connections, carefully
clean the heating system (pipes, radiators, etc.)
with special pickling or de-scaling products to
remove any deposits that could compromise
correct boiler operation.
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
discharge funnel. Otherwise, the manufacturer
declines any responsibility in case of ooding if
the drain valve cuts in.
Important: to preserve the life and eciency of the
domestic hot water exchanger it is recommended
to install the “polyphosphate proportioner” kit in
the presence of water whose characteristics can
give rise to scale deposits (in particular, and as
an example, the kit is recommended when water
hardness is higher than 25 French degrees).
Electrical connection. e “Avio 24 kW” boiler
has an IPX4D protection rating for the entire
appliance. Electrical safety of the unit is reached
when it is correctly connected to an ecient
earthing system as specied by current safety
standards.
Important: Immergas S.p.A. declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an
ecient earthing 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
leads.
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.
In the event of mains fuse replacement on the
control card, use a 3.15A quick-blow fuse. For
the main power supply to the appliance, never
use adapters, multiple sockets or extension leads.

1-3 1-4
1-5 1-6
45
31
58
*
5 - IE
INSTALLATORUSERMAINTENANCE
Remote Friend ControlV2 (CARV2)
On/O digital timer thermostat.
Digital Remote Control (CRD)
1.4 REMOTE CONTROLS AND
ROOM CHRONOTHERMOSTATS
OPTIONAL.
e boiler is prepared for application of room
chronothermostats and external probe. ese
Immergas components are available as separate
kits to the boiler and are supplied on request.
All Immergas chronothermostats are connected
with 2 wires only. Carefully read the user and
assembly instructions contained in the accessory
kit.
• On/O digital chronothermostat (Fig. 1-3). e
chronothermostat allows:
- to set two room temperature values: one for
day (comfort temperature) and one for night
(lower temperature);
- to set up to four on/o dierential weekly
programs;
- selecting the required function mode from
the various possible alternatives:
• permanent functioning in comfort temp;
• permanent operation in lower temp;
• permanent function in adjustable anti-freeze
temp
e chronothermostat is powered by two 1.5V
LR 6 type alkaline batteries.
• ere are two types of Remote Friend ControlV2
(CARV2) (Fig. 1-3) and Digital Remote
Control (CRD) (Fig. 1-4) both with room
chronothermostat functioning. In addition to
the functions described in the previous point,
the Remote Friend ControlV2 enables the
user to control all the important information
regarding operation of the appliance and the
heating system with the opportunity of easily
intervening on the previously set parameters
without having to go to the place where the
appliance is installed. The Remote Friend
ControlV2 panel is provided with self-diagnosis
to display any boiler functioning anomalies.
e climate chronothermostat incorporated in
the remote panel enables the system delivery
temperature to be adjusted to the actual needs
of the room being heated, in order to obtain
the desired room temperature with extreme
precision and therefore with evident saving
in running costs. e chronothermostat is fed
directly by the boiler by means of the same 2
wires used for the transmission of data between
boiler and chronothermostat.
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. e CRD cannot
be used for plants divided into zones.
Electrical connection of the Remote Friend
ControlV2 or chronothermostat On/Off
(Optional). e operations described below must
be performed aer having removed the voltage
from the appliance . e eventual thermostat
or On/Off room chronothermostat must be
connected to terminals 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.
e eventual Remote Friend ControlV2 must be
connected by means of terminals IN+ and IN-
to terminals 42 and 43, eliminating jumper X40
on the terminal board (in the boiler) respecting
polarity (Fig. 3-2). Connection with the wrong
polarity prevents functioning, but without
damaging the Remote Friend ControlV2. The
boiler works with the parameters set on the
Remote Friend ControlV2 only if the boiler main
selector is turned to Domestic/Remote Control
( ). e boiler can only be connected to one
remote control.
Important: If the Remote Friend ControlV2,
Digital Remote Control or any other On/O
chronothermostat is used arrange two separate
lines in compliance with current regulations
regarding electrical systems. Boiler pipes must
never be used to earth the electric or telephone
lines. Ensure elimination of this risk before
making the boiler electrical connections.
1.5 EXTERNAL PROBE OPTIONAL.
• External temperature probe (Fig. 1-5). is
sensor can be connected directly to the boiler
electrical system and allows the max. system
delivery temperature to be automatically
decreased when the outside temperature
increases, in order to adjust the heat supplied
to the system according to the change in
external temperature. The external probe
always operates when connected, regardless of
the presence or type of room chronothermostat
used and can work in combination with the On/
O chronothermostat and the CARV2, (it cannot
be connected to the CRD). e correlation
between system delivery temperature and
outside temperature is determined by the
position of the knob on the boiler control
panel according to the curves shown in the
diagram (Fig. 1-6). e external probe electrical
connection must be made on clamps 38 and 39
on the boiler circuit board (Fig. 3-2).
* (Fig. 1-6) Position of the heating temperature
user adjustment.

6 - IE
INSTALLATORUSERMAINTENANCE
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 holes in the walls of the room to
ventilate that go towards the outside;
- ventilation pipes, individual or branched type.
e air used for ventilation must be withdrawn
directly from outside, in an area away from
sources of pollution. Natural air flow is also
allowed indirectly by air intake from adjoining
rooms. For further information relative to ven-
tilation of the rooms follow that envisioned in
the regulation.
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 FUME DUCTS.
e gas appliances with attachment for the fumes
discharge pipe must have direct connection to
chimneys or safely ecient ues.
Only if these are missing can the combustion
products be discharged directly to the outside,
as long as the provisions of the regulation are
complied with.
Connection to chimneys or ues. e connec-
tion of the appliances to a chimney or ue takes
place by means of fume ducts.
In the case of connection to pre-existing ues, these
must be perfectly clean as the slag, if present, on de-
tachment from the walls during functioning, could
obstruct the passage of fumes, causing extremely
dangerous situations for the user.
The fume 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 requisites of
this regulation.
1.8 FLUES/CHIMNEYS.
For the appliances with natural draught indivi-
dual chimneys and branched ues can be used.
Individual chimneys. e internal dimensions
of some types of individual chimneys are con-
tained within the prospects of the regulation. If
the eective system data do not fall within the
conditions of applicability or the table limits, the
size of the chimney must be calculated according
to the regulation.
Branched ues. In buildings with lots of oors,
branched ues can be used for the natural drau-
ght evacuation of combustion products. New
ues must be designed following the calculation
method and provisions of the regulation.
Chimney caps.e cap is a device positioned
crowning an individual chimney or branched
ue. is device eases the dispersion of combu-
stion products, even in adverse weather condi-
tions, and prevents the deposit of foreign bodies
is must satisfy the requisites of the 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 to the outside.The natural
draught appliances, envisioned to be connected
to a chimney or a ue, can discharge the com-
bustion 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 ue. e exhaust duct must be in com-
pliance with the same requisites listed for the
fume ducts, with further provisions stated in the
regulation in force.
Positioning of the draught terminals. The
draught terminals must:
- be situated on the perimeter walls outside the
building;
- be positioned in a way that the distances
respect the minimum values stated in the
technical regulations in force.
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 fume exhaust is allowed
for natural or forced draught gas appliances with
a heating power range from 4 to 35 kW, provi-
ded 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.
1.9 SYSTEM FILLING.
Once the boiler is connected, proceed with sy-
stem lling via the lling valve (Fig. 2-2).
Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler
and heating system vents.
e boiler has a built-in automatic venting valve
on the circulator. Check if the cap is loose. Open
the radiator air vent valves.
Close vent valves only when water is delivered.
Close the lling valve when the boiler pressure
gauge indicates approx. 1.2 bar.
N.B.: During these operations, turn on the
circulating pump at intervals by means of the
main selector switch on the control panel. Vent
the circulation pump by loosening the front cap
and keeping the motor running.
Re-tighten the cap aerwards.
1.10 GAS SYSTEM STARTUP.
To start up the system proceed as follows:
- open windows and doors;
- avoid presence of sparks or naked ames;
- bleed all air from pipelines;
- check that the internal system is properly sealed
according to specications.
1.11 STARTUP OF THE BOILER
IGNITION.
For issue of the Declaration of Conformity
provided for by the Law, the following must be
performed for boiler start-up:
- check that the internal system is properly sealed
according to specications
- ensure that the type of gas used corresponds to
boiler settings;
- switch on the boiler and ensure 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 functio-
ning of fans;
- ensure that the safety device is engaged in the
event of gas supply failure and check activation
time;
- check activation of the main circuit-breaker
selector upstream from the boiler and on the
unit.
e boiler must not be started up in the event of
failure to comply with any of the above.
N.B.: le boiler preliminary check must be carried
out by a qualied technician. e boiler warranty
is valid as of the date of testing. e test certicate
and warranty is issued to the user.
1.12 DOMESTIC HOT WATER BOILER
DEVICE.
e Avio kW boiler is the accumulation type with
a capacity of 45 litres. It contains a large coiled
stainless steel heat exchanger pipe, which allows
to notably reduce hot water production times.
ese boilers built with stainless steel casing and
bottoms, guarantee long duration.
e assembly concepts and welding (T.I.G.) are
implemented to the minimum detail to ensure
maximum reliability.
e lower inspection ange ensures practical
control of the boiler and the coiled heat exchan-
ger and easy internal cleaning.
e domestic water attachments are found on the
ange cover (cold inlet and hot outlet) and also
the magnesium anode holder cap, including the
latter, supplied as standard for internal protection
of the boiler from possible corrosion.
N.B.: every year a skilled technician (e.g.
Immergas Authorised Aer-sales Service), must
check the eciency of the boiler’s Magnesium
Anode. e boiler is prepared for introduction
of the domestic water re-circulation connection.

1-7
A
B
7 - IE
INSTALLATORUSERMAINTENANCE
A= Total head available to the plant on the third speed (screws tightened by 1.5 revs with respect to the completely loose adjustment screws).
B= Total head available to the plant on the second speed (screws tightened by 1.5 revs with respect to the completely loose adjustment screws)
Total head available to the plant.
Total head (m H2O)
Capacity (l/h)
Total head (kPa)
1.13 CIRCULATION PUMP.
Avio kW Range boilers are supplied with a built-
in circulation pump with 3-position electric spe-
ed 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 circulation 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.
1.14 KITS AVAILABLE ON REQUEST.
• Kit of system shuto valves (on request). e
boiler is designed for installation of system
shuto valves to be placed on delivery and
return pipes of the connection assembly. is
kit is particularly useful for maintenance as
it allows the boiler to be drained separately
without having to empty the entire system.
• System zone 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 batching kit (on request). e
polyphosphate dispenser Reduces the forma-
tion of lime-scale and preserves the original
heat exchange and domestic hot production
water conditions. e boiler is prepared for
application of the polyphosphate dispenser kit.
e above kits are supplied complete with in-
structions for assembly and use.

1- 8
8 - IE
INSTALLATORUSERMAINTENANCE
Key:
1 - Fumes hood
2 - primary heat exchanger
3 - Air bleeding valve
4 - Boiler circulation pump
5 - Gas valve
6 - 3-way valve (motorised)
7 - System ller tap
8 - System expansion tank
9 - Domestic water probe
10 - Stainless steel boiler
11 - 3 bar safety valve
1.15 BOILER COMPONENTS.
12 - System emptying tap
13 - 8 bar safety valve
14 - Boiler emptying cock
15 - Fumes thermostat
16 - Delivery probe
17 - Safety thermostat
18 - Combustion chamber
19 - Ignition and detection plugs
20 - Burner
21 - Adjustable by-pass

2-1
INSTALLATORUSERMAINTENANCE
9 - IE
2 INSTRUCTIONS FOR USE AND MAINTENANCE
2.1 CLEANING AND MAINTENANCE.
Important: the heating plants must undergo
periodical maintenance (regarding this, see in
the section dedicated to the technician, the point
relative to “yearly control and maintenance of
the appliance”) and regular checks of energy
eciency 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. The
provisions relative to ventilation, the fume pipes,
chimneys and caps are stated in Par. 1.6 ÷ 1.8. If
in doubt regarding correct ventilation, refer to
professional, qualied sta.
2.3 GENERAL WARNINGS
Never expose the suspended boiler to direct
vapours from a cooking surface.
Use of the boiler by unskilled persons or children
is strictly prohibited.
If temporary shutdown of the boiler is required,
proceed as follows:
a) drain the heating system if anti-freeze is not
used;
b) shut-o all electrical, water and gas supplies.
In the case of work or maintenance to structures
located in the vicinity of ducting or devices
for 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 ad dangerous to obstruct the air
intake, even partially, for the ventilation of the
room in which the boiler is installed.
Due to the danger, functioning is also prohibited
in the same room as suction devices, chimneys
or similar at the same time as the boiler unless
there are additional openings dimensioned in a
way to satisfy the further necessity for air. For the
dimensioning of these additional openings, refer
to qualied technical sta. In particular, an open
re must have its own air supply.
On the contrary, the boiler cannot be installed
in the same room.
• Important: the use of components involving
use of electrical power requires some
fundamental rules to be observed such as:
- 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 atmospheric agents
(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 personnel for replacement;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.
Key:
1 - Flame presence LED
2 - Domestic hot water LED
3 - Heating function LED
4 - Temperature LED – Insucient
circulation anomaly
5 - Temperature LED – Delivery probe
anomaly
2.4 CONTROL PANEL.
6 - Temperature LED – ignition block
7 - Temperature LED – Over-temperature
block
8 - Temperature LED – Fumes thermostat
anomaly
9 - Stand-by-Domestic water / Remote
Control - Domestic water and Heating-
Reset Selector switch
10 - Domestic hot water temperature
selector switch
11 - Heating water temperature selector
switch
12 - Boiler manometer

INSTALLATORUSERMAINTENANCE
10 - IE
2.5 IGNITION OF THE BOILER.
Before ignition make sure the heating system is
lled with water and that the manometer (12)
indicates a pressure of 1÷1,2 bar.
- Open the gas cock upstream from the boiler.
- Turn the master switch (9) taking it to
the Domestic/Remote Friend ControlV2
(CARV2) ( )or Domestic Hot Water
( )position.
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.
Important: ashing of one of the LEDs from 4
to 8 indicates that there is an anomaly present,
refer to the successive 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 Friend ControlV2
(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 ControlV2.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 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 in a clockwise
direction to increase the temperature and in
an anti-clockwise direction 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.: the boiler may start-up automatically if the
anti-freeze function is activated.
2.6 FAULT AND ANOMALY SIGNALS.
The Avio kW boiler signals ant anomaly by
ashing of one of the LEDs from 4 to 8 or LEDs 1
and 2 coupled to LED 7. On any remote controls,
the error code will be displayed using a numerical
code preceeded or followed by the letter E (e.g.
CARV2 = Exx, CRD = xxE)
Boiling device probe anomaly. If the card
detects an anomaly on the boiler NTC probe,
the boiler does not start-up in domestic water
mode however, functioning in heating mode; a
skilled technician must be called (e.g. Immergas
Aer-sales Service).
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 circulation; check that no shuto devices
are closed on the heating circuit and that the
system is free of air (deaerated);
- circulating pump blocked; free the circulating
pump.
If this phenomenon occurs frequently, contact a
qualied technician for assistance (e.g. Immergas
Technical Services Centre).
Delivery probe . anomaly If the board detects an
anomaly on the system NTC delivery probe the
boiler will not start; contact a qualied technician
for assistance (e.g. Immergas Technical Services
Centre).
Ignition block. The boiler lights up with
each demand for room heating or hot water
production. If this does not occur within
10 seconds, the boiler remains in stand-by
for 30 seconds, try again and if the second
attempt fails it goes into “ignition block”
(ashing LED 6). To eliminate “ignition block”
the main selector switch (9) must be turned
to the Rest position. The Anomaly can be
reset 5 times consecutively, after which the
function in inhibited for at least one hour. One
attempt is gained every hour for a maximum
of 5 attempts. By switching the appliance on
and off the 5 attempts are re-acquired. On
commissioning or aer extended inactivity it
may be necessary to eliminate the “ignition
block”. If this phenomenon occurs frequently,
contact a qualified technician for assistance.
(e.g. Immergas Aer-sales Service).
Safety thermostat block (over-temperature).
During operation, if a fault causes excessive
overheating internally, in the exhaust, or an
anomaly occurs in the ame control section,
an over-temperature block is triggered in the
boiler (LED 7 ashing). To eliminate the “over-
temperature block”, turn the main selector
switch (9) temporarily to the Reset position. If
this phenomenon occurs frequently, contact a
qualied technician for assistance (e.g. Immergas
Technical Services Centre).
Fumes thermostat block. is occurs if the ue
gas evacuation pipe does not function correctly
(code 03). 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. However, it is indispensable
to call a qualified 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 ame
control unit. e boiler does not start. A qualied
technician must be called (e.g. Immergas Aer-
Sales Service).
Loss of remote control communication. . This
occurs if an incompatible remote control is
connected, or if communication between the
boiler and the CARV2 or CRD is lost. Try the
connection procedure again by turning the
boiler off 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 qualified technician for
assistance (e.g. Immergas Technical Services
Centre).
Signalling and diagnostics - Display on Remote
Friend ControlV2 screen (optional). During
normal boiler operation the room temperature
value is displayed on the Remote Friend
ControlV2 (CARV2 or CRD) screen; in case of
malfunction or anomaly, the temperature value
is replaced by the relative error code given in the
table (Par. 2-6).
Important: : if the boiler is set in stand-by “ ”
the “CON” connection error symbol will appear
on the CARV2 and error code “31E” on the CRD.
e remote controls are powered constantly so as
not to loose the memorised programs.
2.7 BOILER SHUTDOWN.
Disconnect the main selector switch (9) taking
it to position “ ” (Leds from 1 to 8 off),
disconnect the external omni-polar switch to the
boiler and close the gas cock upstream from the
appliance. Never leave the boiler switched on if
le unused for prolonged periods.
Anomaly signalled Flashing
LED
Remote
display
Boiling device probe
anomaly Led 2 ( ) 12
Insucient
circulation Led 4 ( ) 27
Delivery probe
anomaly Led 5 ( ) 05
Ignition
block Led 6 ( ) 01
Safety thermostat block
(over-temperature) Led 7 ( ) 02
Fumes thermostat
block Led 8 ( ) 03
Contacts resistance
block
Led 2 ( )
and 7 (
) ash at the
same time
04
Parasite ame block
Led 1 ( )
and 7 (
) ash at the
same time
20
Loss of remote control
communication
Led 2 and
3 ash alter-
nately
( )
31

2-2
1
23
4
5
INSTALLATORUSERMAINTENANCE
11 - IE
2.8 RESTORING 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
cool) restore normal pressure via the valve located
at the bottom of the boiler (Fig. 2-2).
N.B.: close the valve aerwards.
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 DRAINING THE SYSTEM..
To drain the boiler, use the special drain cock
(Fig. 2-2)
Before draining, ensure that the lling cock is
closed.
2.10 DRAINING THE BOILER.
To drain the boiler, use the special drain cock
(Fig. 2-2)
N.B.: before performing this operation close the
boiler cold water inlet cock and open hot water
cock in the domestic water system in order to
allow water to enter the boiler.
2.11 ANTIFREEZE PROTECTION.
e boiler comes standard with an antifreeze
function that activates the pump and burner
when the system water temperature in the boiler
falls below 4°C.
e antifreeze function is guaranteed if the boiler
is fully operative and not in “block” status, and is
electrically powered. To avoid keeping the system
switched on in case of a prolonged absence, the
system must be drained completely or antifreeze
substances added to the heating system water.
In both cases the boiler domestic water circuit
must be drained. In systems that are drained
frequently, filling must be carried out with
suitably treated water to eliminate hardness that
can cause lime-scale.
2.12 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents
2.13 DECOMISSIONING.
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
1 - Boiler drain cock
2 - Domestic water inlet cock
3 - Gas cock
4 - System drain cock
5 - System lling valve

3-1
INSTALLATORUSERMAINTENANCE
12 - IE
3 BOILER COMMISSIONING INITIAL CHECK
To commission the boiler:
- ensure that the declaration of conformity of
installation is supplied with the appliance;
- ensure that the type of gas used corresponds to
boiler settings;
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
- make sure the heating system is lled with
water and that the manometer indicates a
pressure of 1 - 1.2 bar;
- make sure the air valve cap is open and that the
system is well deaerated;
- switch the boiler on and ensure correct ignition;
- make sure the gas maximum, medium and
minimum flow rate and pressure values
correspond to those given in the handbook
(Par. 3.16);
- check activation of the safety device in the event
of no gas, as well as the relative activation time;
- check activation of the master switch located
upstream from the boiler and in 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);
- ensure production of hot domestic water;
- ensure sealing eciency of water circuits;
- check ventilation and/or aeration of the
installation room where provided.
If any checks/inspection give negative results, do
not start the boiler.
3.1 HYDRAULIC LAYOUT.
Key:
1 - Gas valve
2 - Stainless steel coil for boiler
3 - Magnesium anode
4 - Stainless steel boiler
5 - Air bleeding valve
6 - Burner
7 - Combustion chamber
8 - Primary heat exchanger
9 - Fumes hood
10 - Flue safety thermostat
11 - Delivery probe
12 - Safety thermostat
13 - System expansion tank
14 - Boiler circulating pump
15 - Adjustable by-pass
16 - System drain cock
17 - 3-way valve (motorised)
18 - Domestic water probe
19 - 3 bar safety valve
20 - System lling cock
21 - 8 bar safety valve
22 - Cold water inlet non-return valve
23 - Boiler drain cock
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
R - System return
M - System delivery

3-2
11
12
12
13 13
9
9
8 7
7 8
12 11
9
14
15
11 10
10
5
4
3
9
9
8
7 6
1
2
INSTALLATORUSERMAINTENANCE
13 - IE
3.2 WIRING DIAGRAM.
Key:
A5 - CARV2 interface card
B1 - Delivery probe
B2 - Domestic water probe
B4 - External probe (optional)
CARV2 - Remote Friend ControlV2 (optional)
CRD - Digital Remote Control (optional)
E1 - Ignition plugs
E2 - Igniter sensor
E4 - Safety thermostat
E6 - Fumes thermostat
F1 - Neutral fuse
F2 - Line fuse
M1 - Boiler circulating pump
M30 - 3-way valve (motorised)
R5 - Domestic water temp. trimmer
R6 - Heating temp. trimmer
R10 - Main selector switch
S8 - Gas type selector
S20 - Environment thermostat (optional)
T2 - Switch-on transformer
X40 - Environment thermostat jumper
Y1 - Gas valve
Y2 - Gas valve modulator
1 - Primary
2 - Secondary
3 - 230 Vac 50Hz Power supply
4 - 230 Vac 50Hz max 2°aux. output
5 - Area card
6 - Yellow/Green
7 - Blue
8 - Brown
9 - White
10 - Green
11 - Red
12 - Black
13 - Grey
14 - Heating
15 - Domestic water
Remote controls: the boiler is designed to use
the Remote Friend ControlV2 (CARV2), or as an
alternative to the Digital Remote Control (CRD)
which must be connected to clamps 42 and 43 of
connector X9 for the CARV2 (respecting polarity)
and clamps 40 and41 of connector X9 for the
CRD on the circuit board and in both cases
eliminating X40.
Environment thermostat (alternative to the
CRD): the boiler is designed to use 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
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).
This may be caused by: a dirty burner, or
blocked boiler lamellar pack.
- Frequent activation of the temperature
overload thermostat. is may be caused by
lack of water in the boiler, insucient water
circulation in the circuit, a blocked circulator
or an anomaly of the boiler adjustment card.
Check via the pressure gauge that values are
within admissible 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 chimney safety
thermostat. is can be caused by obstructions
in the fumes circuit. Check the ue. e ue
may be obstructed or by height or section
not suitable for the boiler. Ventilation may be
insucient (see room ventilation point).
- Presence of air in the system. Check opening
of the special air bleeding cap (Fig. 1-8). Make
sure the system pressure and expansion tank
pre-charge values are within the set limits; the
pre-charge value for the expansion tank must
be 1.0 bar, and system pressure between 1 and
1.2 bar.
- Ignition block and Flue block (Par. 2.6).
- Domestic water probe broken. e boiler does
not have to be emptied in order to replace the
domestic water probe as the probe is not in
direct contact with the domestic hot water
present in the boiler.

3-3
3-4
43
2
1
56
INSTALLATORUSERMAINTENANCE
14 - IE
3.4 CONVERTING THE BOILER TO
OTHER TYPES OF GAS
If the boiler has to be converted to a dierent gas
type to that specied on the data-plate, request
the relative conversion kit for quick and easy
conversion.
Boiler conversion must be carried out by a
qualied technician (e.g. Immergas 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;
- move jumper 16 (Fig. 3-4) into 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
loosening the rear screw fasteners;
- apply voltage to the appliance;
- adjust the boiler maximum heat power;
- adjust the boiler minimum heat power;
- adjust (eventually) the heating power;
- seal the gas ow rate devices (if adjusted);
- aer completing conversion, apply the sticker,
present in the conversion kit, near 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. 3.16).
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 no detatch 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 Assistance Service). Burner calibration
must be carried out using a “U” or digital type
dierential pressure gauge, connected to the gas
valve pressure outlet (part. 4 Fig. 3-3), keeping
to the pressure value given in the tables (Par.
3.16) according to the type of gas for which the
boiler is prepared.
3.6 POSSIBLE ADJUSTMENTS OF THE
GAS VALVE.
• Adjustment of boiler nominal heat output (Fig.
3-3).
- Turn the domestic hot water selector knob (10
Fig. 2-1) to the maximum functioning position;
- open the domestic hot water cock in order to
prevent modulation intervention;
- adjust the boiler nominal power on the brass
nut (3), keeping to the maximum pressure
values stated in the tables (Par. 3.16) depending
on the type of gas;
- by turning in a clockwise direction the heating
potential increases and in an anti-clockwise
direction it decreases.
• Adjust the boiler minimum thermal input (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
reel (just disconnect a faston); By turning
the screw in a clockwise direction, the
pressure increases, in an anti-clockwise
direction it decreases. On completion of
calibration, re-apply the power supply to the
modulating reel. e pressure to which the
boiler minimum power must be adjusted,
must not be lower than that 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 adjusting, ret the cap and screw.
3.7 PROGRAMMING THE CIRCUIT
BOARD.
The Avio kW 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: position the main selector switch on Reset
for a period of time between 15 and 20 seconds
(aer about 10 sec. LEDs 2 and 3 will start to ash at
the same time. Wait for this to end and re-position
the main selector switch on domestic water and
heating). At his point, re-position the main selector
switch on domestic water-heating.( ).
When the programming phase has been
activated, enter the rst level where it is possible
to choose the parameter to be set.
e latter is indicated by the fast ashing of one
of the LEDs between 1 and 8 (Fig. 2-1).
Selection is made by turning the domestic hot
water temperature selector switch (10). For
association of the LED to the parameter, see the
following table:
List of parameters Flashing
LED (fast)
Minimum heating power Led 1
Maximum heating power Led 2
Heating switch-on timer Led 3
Heating power output ramp Led 4
Heating switch-on delay on request
from Environmental ermostat,
Digital Remote Control or Remote
Friend Control V2
Led 5
Domestic water thermostat/Boiler
hysteresis Led 6
Circulating pump functioning Led 7
Functioning gas Led 8
Boiler mode Led 1 and 8
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
SIT 845 gas valve
Key:
1 - Coil
2 - Minimum power adjustment screws
3 - Maximum power adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection hood
Circuit board
10 - Line fuse 3.15AF
11 - Neutral fuse 3.15AF
12 - Main selector switch
13 - Domestic water temperature trimmer
14 - RS232 computer interface
15 - Heating temperature trimmer
16 - METHANE L.P.G. gas type selector

INSTALLATORUSERMAINTENANCE
15 - IE
slow ashing of one of the LEDs between 1 and
8. e value is selected by rotating the heating
temperature selector switch (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 power. Heating power. e boiler is
produced and calibrated in the heating phase at
nominal power. It also has electronic modulation
that adapts the boiler potentiality to the eective
heating demand of the house. en the boiler
works normally in a variable gas pressure eld
between the minimum heating power and the
maximum heating power depending on the
plants heating.
N.B: the selection of the “Minimum heating
power” and “Maximum heating power”
parameters, in the presence of a heating demand
, allows switch-on of the boiler and power supply
of the modulator with current equal to the value
of the respective selected parameter.
Minimum heating power
(continuous variation)
Flashing
LED
(slow)
0% Imax. (Standard setting) Led 1
7% Imax. Led 2
14% Imax. Led 3
21% Imax. Led 4
28% Imax. Led 5
35% Imax. Led 6
42% Imax. Led 7
63% Imax. Led 8
Maximum heating power
(continuous variation)
Flashing
LED
(slow)
0% Imax. Led 1
11% Imax. Led 2
22% Imax. Led 3
33% Imax. Led 4
44% Imax. Led 5
55% Imax. Led 6
88% Imax. Led 7
100% Imx. (Standard settino) Led 8
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
Heating ramp timing. e boiler distributes he
maximum power set in the previous parameter.
e boiler performs an ignition ramp of about
650 seconds to arrive from minimum power to
nominal heating power
Heating ramp timer (conti-
nuous 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 Remote Friend ControlV2. e
boiler is set to switch-on immediately aer a
request. In the case of particular plants (e.g. area
plants with motorised thermostatic valves etc.) it
could be necessary to delay switch-on.
Heating switch-on delay re-
quest from Room thermostat
and Remote Friend ControlV2
(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
Domestic water thermostat/Boiler hysterisis.
With the setting of hysteresis 1 the boiler switches
on with a boiling device temperature equal to a
set point at -3°C. With the setting of hysteresis
2 the boiler switches on with a boiling device
temperature equal to a set point at -10°C.
Domestic water thermostat/
Boiler hysterisis
Flashing
LED
(slow)
Hysteresis 1 (Standard setting) Led 1
Hysteresis 1 Led 8
Circulating pump function. Two circulating
pump operational modes
can be selected in heating phase.
In “intermittent” mode it is activated from the
environmental thermostat or from the remote
control, in “continual” mode the circulation
pump functions constantly when the main se-
lector switch (12) is on heating mode.
Circulating 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 ad just the boiler in
order to function with gases from the rst family.
Town Gas G110 - Industrial
gas (rst family gas)
Flashing
LED
(slow)
O (Standard setting) Led 1
On Led 8
Boiler mode. Establishes if the boiler functions
in instantaneous mode or with boiler (standard
supply).
Boiler mode
Flashing
LED
(slow)
Instantaneous (Cannot be
used) Led 1
With boiler (Standard setting) Led 8
3.8 FAUTOMATIC SLOW IGNITION
FUNCTION WITH TIMED RAMP
DELIVERY.
In the switch-on phase the electronic card car-
ries out an increasing gas delivery ramp (with
pressure values that depend on the type of gas
selected) of preset duration. is avoids every
boiler lighting phase calibration or preparation
operation in any conditions of use.
3.9 “CHIMNEY SWEEP” FUNCTION.
When activated, this function forces the boiler
at max. output for 15 minutes.
IIn this mode all the adjustments are cut out and
only the temperature safety thermostat and the
limit thermostat remain active. To activate the
“Chimney-Sweep” function, press the Reset key
for 8 to 15 seconds in absence of domestic water
and heating requests. Its activation is indicated
by the simultaneous ashing of LEDS (2) and
(3).is function allows the technician to check
the combustion parameters. Aer the checks
deactivate the function, switching the boiler o
and then on again.

3-5
2
1
INSTALLATORUSERMAINTENANCE
16 - IE
3.10 PUMP ANTIBLOCK FUNCTION.
e boiler has a function that starts the pump
once every 24 hours for the duration of 30 se-
conds in order to reduce the risk of the pump
becoming blocked due to prolonged inactivity.
3.11 THREEWAY ANTIBLOCK SYSTEM.
Both in “domestic” and in “domestic-heating”
phase the boiler is equipped with a function that
starts the three-way motorized 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 RADIATOR ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.13 ELECTRONIC CARD PERIODICAL
SELFCHECK.
During operation 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 operation in domestic circuit mode the self-
check starts within 10 minutes aer the end of
the drawing in progress, for a length of approx.
10 seconds.
N.B.: During self-check, the boiler remains o,
including signalling.
3.14 CASING REMOVAL.
To facilitate boiler maintenance the casing can
be completely removed as follows
(Fig. 3-5):
- Disassemble the lower cover by removing the
two relevant screws (1).
- Unscrew the two screw fasteners on the
dashboard and open it making it pivot
- Unscrew the 2 xing screws (2) on the casing.
- Unhook the lower part of the casing as
described in the gure.
- Pull the casing (4) forwards and up at the
same time (see gure) to detach it from the
upper hooks
3.15 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the fume hood for deterioration
or corrosion.
- Check correct lighting and operation.
- Ensure correct calibration of the burner in
domestic water and heating phases.
- Check correct operation of control and
adjustment devices and in particular:
- intervention of electrical main electrical
switch on boiler;
- system control thermostat intervention;;
- domestic water control thermostat
intervention
- Check that the internal system is properly
sealed according to specications.
- Check intervention of the device against no gas
ionization ame control:
intervention time must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, aer discharging system pressure
and bringing it to zero (read on boiler pressure
gauge), the expansion tank 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 ller cock) is between 1 and 1.2
bar.
- Check visually that the safety and control
devices have not been tampered with and/or
shorted, in particular
- temperature safety thermostat;
- fumes pressure switch.
- Check integrity of the boiler Magnesium anode.
- Check the condition and integrity of the
electrical system and in particular:
- electrical power cables must be inside the
whipping;
- there must be no traces of blackening or
burning.

INSTALLATORUSERMAINTENANCE
17 - IE
METHANE (G20) BUTANE (G30) PROPANE (G31)
HEAT
POWER
HEAT
POWER
GAS FLOW
RATE BURNER
NOZZLE
PRESSURE BURNER
GAS FLOW
RATE BURNER
NOZZLE
PRESSURE BURNER
GAS FLOW
RATE BURNER
NOZZLE
PRESSURE BURNER
(kW) (kcal/h) (m3/h) (mbar) (mm H2O) (kg/h) (mbar)(mm H2O) (kg/h) (mbar) (mm H2O)
23,7 20382 2,77 13,30 135,6 2,07 27,80 283,5 2,04 35,80 365,1
23,0 19780 2,69 12,55 128,0 2,01 26,69 272,2 1,98 33,86 345,3
22,0 18920 2,58 11,52 117,5 1,93 25,12 256,1 1,89 31,20 318,2
21,0 18060 2,47 10,54 107,5 1,84 23,55 240,1 1,81 28,66 292,3
20,0 17200 2,35 9,61 98,0 1,76 21,99 224,2 1,73 26,24 267,5
19,0 16340 2,24 8,73 89,0 1,67 20,43 208,3 1,64 23,92 243,9
18,0 15480 2,13 7,90 80,5 1,59 18,87 192,5 1,56 21,71 221,4
17,0 14620 2,02 7,10 72,4 1,50 17,32 176,6 1,48 19,61 200,0
16,0 13760 1,90 6,36 64,8 1,42 15,77 160,8 1,40 17,61 179,6
15,0 12900 1,79 5,65 57,6 1,34 14,21 144,9 1,32 15,70 160,1
14,0 12040 1,68 4,98 50,8 1,25 12,65 128,9 1,23 13,90 141,7
13,0 11180 1,57 4,36 44,5 1,17 11,08 112,9 1,15 12,18 124,3
12,0 10320 1,45 3,78 38,5 1,09 9,50 96,9 1,07 10,57 107,8
11,0 9460 1,34 3,24 33,0 1,00 7,91 80,6 0,98 9,04 92,2
10,0 8600 1,23 2,74 27,9 0,92 6,31 64,3 0,90 7,61 77,6
9,5 8170 1,17 2,50 25,5 0,87 5,50 56,1 0,86 6,93 70,7
3.16 VARIABLE HEAT POWER.
N.B.: Gas flow rates refer to heating power
below a temperature of15°C and at a pressure of
1013 mbar. Burner pressure values refer to use
of gas at 15°C.
3.17 COMBUSTION PARAMETERS.
G20 G30 G31
Gas nozzle diameter mm 1.30 0.79 0.79
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 minimum heat output kg/h 63 60 62
CO2 at Q. Nom./Min. % 5,00 / 2,37 6,10 / 2,88 5,90 / 2,75
CO at 0% of O2 at Q. Nom./Min. ppm 55 / 45 109 / 59 59 / 50
NOX at 0% of O2 at Q. Nom./Min. ppm 177 / 81 279 / 115 240 / 108
Flue temperature at nominal heat output °C 101 106 104
Flue temperature at minimum heat output °C 76 79 77

INSTALLATORUSERMAINTENANCE
18 - IE
- Temperature adjustment at domestic water ow
of 7l/min. with inlet temperature of 15°C.
- Fume temperature values refer to an air inlet
temperature of 15°C.
- e data relevant to domestic hot water per-
formance refer to a dynamic inlet pressure of
2 bar and an inlet temperature of 15°C; the
values are measured directly at the boiler outlet
considering that to obtain the data declared
mixing with cold water is necessary.
- e max. sound level emitted during boiler
operation is < 55dBA. e sound level value is
referred to semianechoic chamber tests with
boiler operating at max. heat output, with
extension of fume exhaust system according
to product standards.
3.18 TECHNICAL DATA.
Nominal heating power kW (kcal/h) 26,2 (22546)
Minimum heating power kW (kcal/h) 11,0 (9500)
Nominal heating power (useful) kW (kcal/h) 23,7 (20382)
Minimum heating power (useful) kW (kcal/h) 9,5 (8170)
Useful thermal eciency at nominal output % 90,4
Useful thermal eciency at 30% nominal output % 88,0
Heat loss at case with burner On/O % 2,40 / 0,57
Heat loss at ue with burner On/O % 7,20 / 0,43
Heating circuit max. working pressure bar 3
Heating circuit max. working temperature °C 90
Adjustable heating temperature °C 35 - 85
Total volume system heating expansion tank l 7,7
Heating expansion tank pre-charge bar 1
Generator water capacity l 3,6
Head available with ow rate 1000/h kPa (m H2O) 24,7 (2,52)
Hot water production available heat output kW (kcal/h) 23,7 (20382)
Domestic hot water adjustable temperature °C 20 - 60
Domestic circuit ow limiter at 2 bar l/min 9,2
Domestic circuit min. pressure (dynamic) bar 0,3
Domestic circuit max. working pressure bar 8
Specic capacity (∆T 30°C) l/min 13,5
Drawing capacity in continuous duty (∆T 30°C) l/min 11,5
Weight of full boiler kg 96,1
Weight of empty boiler kg 50
Electric attachment V/Hz 230/50
Nominal absorption A 0,43
Installed electric power W 93,5
Power absorbed by circulation pump W 80,0
Equipment electrical system protection - IPX4D
NOX class - 3
NOX weighted mg/kWh 146
CO weighted mg/kWh 49
Type of appliance B11BS
Category II2H3+

immergas.com
Immergas S.p.A.
42041 Brescello (RE) - Italy
T. +39.0522.689011
F. +39.0522.680617
is instruction booklet is made of ecological paper.
Cod. 1.034467IE rev. 15.038920/000 - 09/2012