Immergas VICTRIX HYBRID User manual

VICTRIX HYBRID
IE
Instruction booklet and
warning
Installer
User
Maintenance Technician
*1.046309ENG*
*1.046309ENG*

2

3
INDEX
Dear Customer,................................................................................. 4
General recommendations.............................................................. 4
Safety symbols used.......................................................................... 5
Personal protective equipment....................................................... 5
1 Installation............................................................................ 6
1.1 Description of the product................................................. 6
1.2 Indoor Unit Installation recommendations..................... 6
1.3 Victrix Hybrid Installation................................................. 9
1.4 Outdoor Unit Installation................................................. 14
1.5 Indoor Unit main dimensions. ........................................ 15
1.6 Minimum indoor Unit installation distances ................ 15
1.7 Installation of the outdoor unit in the recessed frame
(Optional)........................................................................... 16
1.8 Indoor unit connection Unit............................................ 17
1.9 Indoor Unit gas connection. ............................................ 17
1.10 Hydraulic connection........................................................ 18
1.11 Electrical power supply connection. ............................... 19
1.12 Control panel main dimensions. ..................................... 20
1.13 Control panel installation operations. ............................ 20
1.14 External temperature probe. ............................................ 20
1.15 room chrono-thermostats (Optional)............................. 21
1.16 230 VAC congurable outlet. ........................................... 21
1.17 Immergas ue systems...................................................... 22
1.18 Tables of resistance factors and equivalent lengths of
“green range” ue system components. .......................... 23
1.19 Outdoor installation in partially protected area............ 25
1.20 Internal installation using a recessed frame with
direct air intake. ................................................................. 27
1.21 Concentric horizontal kit installation............................. 28
1.22 Concentric vertical Kit installation. ................................ 30
1.23 Separator kit installation................................................... 32
1.24 Adaptor C9 kit installation............................................... 34
1.25 Ducting of ues or technical slots. .................................. 36
1.26 Conguration type B, open chamber and fan assisted
for indoors. ......................................................................... 37
1.27 Flue exhaust to ue/chimney............................................ 37
1.28 Flues, chimneys and chimney caps. ................................ 37
1.29 Water treatment system lling......................................... 38
1.30 System lling. ..................................................................... 38
1.31 Filling the condensate drain trap..................................... 38
1.32 Gas system start-up. .......................................................... 38
1.33 Commissioning of the combustion unit (Ignition)....... 39
1.34 Kits available on request. .................................................. 39
1.35 Circulation pump and load losses. .................................. 40
1.36 Indoor unit main components......................................... 42
2 Instructions for use and maintenance............................. 43
2.1 General warnings............................................................... 43
2.2 Cleaning and maintenance............................................... 44
2.3 Control panel...................................................................... 45
2.4 Operation overview. .......................................................... 45
2.5 Comfort / economy / manual operation......................... 46
2.6 Operation with external probe (Audax.DK4)................ 46
2.7 Clock and programs.......................................................... 46
2.8 Settings menu..................................................................... 47
2.9 Indoor Unit Control panel. .............................................. 50
2.10 Use of the indoor unit....................................................... 51
2.11 Indoor unit information menu........................................ 51
2.12 Faults and malfunctions signals from the Control
Panel. ................................................................................... 52
2.13 Switching o....................................................................... 57
2.14 Restore central heating system pressure......................... 57
2.15 Draining the system. ......................................................... 57
2.16 Emptying the D.H.W. circuit............................................ 57
2.18 Antifreeze protection. ....................................................... 57
2.19 Cleaning the case. .............................................................. 57
2.20 Decommissioning.............................................................. 57
3 Instructions for maintenance and
initial check. ....................................................................... 58
3.1 General warnings............................................................... 58
3.2 Initial check. ....................................................................... 58
3.3 Yearly Victrix Hybrid check and maintenance.............. 59
3.4 Indoor Unit Hydraulic Diagram...................................... 61
3.5 Indoor Unit Electrical Diagram....................................... 62
3.6 Programming Victrix Hybrid. ......................................... 63
3.7 Troubleshooting................................................................. 67
3.8 Converting the boiler to other types of gas.................... 67
3.9 Indoor unit fan revs number calibration........................ 67
3.10 Indoor Unit CO2adjustment............................................ 68
3.11 Checks following conversion to another type of gas..... 68
3.12 Programming the indoor unit P.C.B.. ............................. 69
3.13 Password-protected special functions............................. 72
3.14 Automatic vent function (dI)........................................... 72
3.15 Flue installation (Fu)......................................................... 72
3.16 Maintenance function (MA)............................................ 72
3.17 Screed heater function. ..................................................... 73
3.18 “Chimney sweep function”................................................73
3.19 Pump anti-block function. ............................................... 74
3.20 ree-way anti-block system............................................ 74
3.21 Radiators antifreeze function........................................... 74
3.22 Room anti-freeze function. .............................................. 74
3.23 Logic of operation.............................................................. 75
3.24 Indoor Unit casing disassembly....................................... 76
4 Technical data..................................................................... 78
4.1 Indoor Unit variable thermal output. ............................. 78
4.2 Combustion parameters. .................................................. 78
4.3 Indoor Unit Data Table..................................................... 79
4.4 Outdoor Unit technical data tables. ................................ 80
4.5 Product che (in compliance with Regulation
811/2013)............................................................................ 81
4.6 Parameters for lling in the package che. .................... 83

4
e manufacturer declines all liability due to printing or transcription errors, reserving the right to make any modications to its
technical and commercial documents without forewarning.
e company IMMERGAS S.p.A., with registered oce in via Cisa Ligure 95 42041 Brescello (RE), declares that the design, manu-
facturing and aer-sales assistance processes comply with the requirements of standard UNI EN ISO 9001:2015.
For further details on the product CE marking, request a copy of the Declaration of Conformity from the manufacturer, specifying the
appliance model and the language of the country.
Dear Customer,
Our compliments for having chosen a top-quality Immergas product, able to ensure well-being and safety for a long period of time. As
an Immergas customer you can also count on a Qualied Authorised Aer-Sales Technical Assistance Centre, prepared and updated to
guarantee constant eciency of your boiler. Read the following pages carefully: you will be able to draw useful tips on the correct use of the
device, compliance of which will conrm your satisfaction with the Immergas product.
For assistance and routine maintenance, contact Authorised Technical Service Centres: they have original spare parts and are specically
trained directly by the manufacturer.
GENERAL RECOMMENDATIONS
is book contains important information for the:
Installer (section 1); For the installation of the AUDAX.DK4 outdoor unit see the relevant instruction manual;
User (section 2);
Maintenance Technician (section 3).
• e user must carefully read the instructions in the specic section (section 2).
• e user must limit operations on the appliance only to those explicitly allowed in the specic section.
• e appliance must be installed by qualied and professionally trained personnel.
• e instruction booklet is an integral and essential part of the product and must be given to the new user in the case of transfer
or succession of ownership.
• It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation,
use and maintenance stages.
• In compliance with the legislation in force, the systems must be designed by qualied professionals, within the dimensional limits
established by the Law. Installation and maintenance must be performed in compliance with the regulations in force, according
to the manufacturer's instructions and by professionally qualied sta, meaning sta with specic technical skills in the plant
sector, as provided for by Law.
• Improper installation or assembly of the Immergas device and/or components, accessories, kits and devices can cause unexpected
problems for people, animals and objects. Read the instructions provided with the product carefully to ensure proper installation.
• is instructions manual provides technical information for installing Immergas products. As for the other issues related to the
installation of products (e.g. safety at the workplace, environmental protection, accident prevention), it is necessary to comply
with the provisions of the standards in force and the principles of good practice.
• All Immergas products are protected with suitable transport packaging.
• e material must be stored in a dry place protected from the weather.
• Damaged products must not be installed.
• Maintenance must be carried out by skilled technical sta. For example, the Authorised Immergas Service Centre that represents
a guarantee of qualications and professionalism.
• e device 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 booklet (or however supplied by the manufacturer), the manufacturer is excluded from any con-
tractual and extra-contractual liability for any damages and the device warranty is invalidated.

5
SAFETY SYMBOLS USED.
GENERIC HAZARD
Strictly follow all of the indications next to the pictogram. Failure to follow the indications can generate hazard situa-
tions resulting in possible harm to the health of the operator and user in general.
ELECTRICAL HAZARD
Strictly follow all of the indications next to the pictogram. e symbol indicates the appliance’s electrical components
or, in this manual, identies actions that can cause an electrical hazard.
MOVING PARTS
e symbol indicates the appliance’s moving components that can cause hazards.
HOT SURFACES
e symbol indicates the appliance’s very hot components that can cause burns.
SHARP SURFACES
e symbol indicates the appliance’s components or parts that can cause cuts if touched.
EARTH TERMINAL CONNECTION
e symbol identies the appliance’s earth terminal connection point.
READ AND UNDERSTAND THE INSTRUCTIONS
Read and understand the appliance’s instructions before performing any operation, carefully following the indications
provided.
INFORMATION
Indicates useful tips or additional information.
SAFETY GLOVES
PERSONAL PROTECTIVE EQUIPMENT.
SAFETY GOGGLES
SAFETY FOOTWEAR
e user must not dispose of the appliance at the end of its service life as municipal waste, but send it to appro-
priate collection centres.

6
INSTALLATORE
UTENTEMANUTENTORE
1
OK
1INSTALLATION.
1.1 DESCRIPTION OF THE PRODUCT.
Victrix Hybrid is a hybrid heat pump consisting of:
- Victrix 24 HY Hybrid Indoor Unit;
- Outdoor Unit Audax.DK4.
- control panel (supplied in the accessories group of the indoor
unit)
e Victrix Hybrid heat pump was designed only for heating and
production of domestic hot water for domestic use and similar
purposes.
In order to operate properly, the Victrix 24 HY indoor unit must
be paired with an Audax DK4 outdoor unit; as such, all the pro-
visions regarding the safety and use of the control panel, indoor
and outdoor units must be respected.
1.2 INDOOR UNIT INSTALLATION
RECOMMENDATIONS.
ATTENTION:
operators who install and service the
appliance must wear the personal
protective equipment required by ap-
plicable law.
e Victrix 24HY indoor unit was designed only for
wall-mounted installation.
e place of installation of the indoor unit and relative
Immergas accessories must have suitable features
(technical and structural), such as to allow for (al-
ways in safe, ecient and comfortable conditions):
- installation (according to the provisions of technical legisla-
tion and technical regulations);
- maintenance operations (including scheduled, periodic,
routine, special);
- removal (to outdoors in the place for loading and transport-
ing the appliances and components) as well as the eventual
replacement of those with appliances and/or equivalent
components.
e wall surface must be smooth, without any protrusions or
recesses enabling access to the rear part. ey are not designed
to be installed on plinths or oors (Fig. 1).
By varying the type of installation the classication of the boiler
also varies, precisely:
- Type B23 or B53 if installed using the relevant terminal for air
intake directly from the room in which the indoor unit has
been installed.
- Type C if installed using concentric pipes or other types of
pipes envisioned for the sealed chamber indoor units for
intake of air and expulsion of ue gas.
Note: the classication of the indoor unit is provided in the
depictions of the various installation solutions shown on the
following pages.
Only professionally enabled companies are authorised to install
Immergas gas appliances.
Installation must be carried out according to regulation stand-
ards, current legislation and in compliance with local technical
regulations and the required technical procedure
ATTENTION:
It is forbidden to install appliances
removed from other systems. e ma-
nufacturer declines all liability in the event of
damage caused by appliances removed from
other systems or for any non-conformities with
such equipment.
ATTENTION:
check the environmental operating
conditions of all parts relevant to in-
stallation, referring to the values shown in the
technical data table in this booklet.

7
INSTALLATORE
UTENTEMANUTENTORE
ATTENTION:
Installation of the Victrix 24HY indoor
unit when powered by LPG must comply
with the rules regarding gases with a greater
density than air (remember, as an example,
that it is prohibited to install plants powered
with the above-mentioned gas in rooms where
the oor is at a lower quota than the country
level).
Before installing the indoor unit, 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 routine servicing; for minimum installation
distances, refer to Fig. 7.
It is just as important that the intake grids and exhaust
terminals are not obstructed.
It is recommended to check that no ue gas recircula-
tion is found in the air sample points (0.5% maximum
permitted CO2).
Keep all ammable objects away from the appliance (paper,
rags, plastic, polystyrene, etc.).
e minimum distance for exhaust pipes from ammable
materials must be at least 25 cm.
Do not place household appliances underneath the boiler as
they could be damaged if the safety valve intervenes, if the
drain trap is blocked, or if there are leaks from the hydraulic
connections; otherwise, the manufacturer cannot be held re-
sponsible for any damage caused to the household appliances.
For the aforementioned reasons, we recommend not placing
furnishings, furniture, etc. under the boiler.
In the event of malfunctions, faults or incorrect operation, turn
the appliance o immediately and contact an authorised com-
pany (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.
Any modication to the appliance that is not explicitly indicated
in this section of the booklet is forbidden.
Installation Standards:
-this indoor unit can be installed
outdoors in a partially protected
area. A partially protected area is one in
which the boiler is not exposed to the direct
action of the weather (rain, snow, hail, etc.).
is type of installation is only possible when
permitted by the laws in force in the appliance's
country of destination.
-Installation of gas appliances, ue exhaust
pipes and combustion air intake pipes is for-
bidden in places with a re risk (for example:
garages, closed parking stalls), and in poten-
tially dangerous places.
-Installation is prohibited on the verti-
cal projection of the cooking surface.
-Installation is forbidden in places/
rooms that constitute public areas of apart-
ment buildings, internal stairways or other
escape routes (e.g. oor landings, entrance
halls, etc.).
-Installation is also forbidden in places/rooms
that constitute public areas of apartment
buildings such as cellars, entrance halls, at-
tics, los, etc., unless otherwise provided for
by local regulations in force.
-ese boilers are not suitable for installation
on walls made of combustible material.
N.B.:installingthe wall recessedframekit mustguar-
antee theboilerstable,ecient support.e recessed
frame kit ensures appropriate support only if installed
correctly (according to the rules of good practice),
following the instructions on its instructions leaet.
e recessed frame for the boiler is not a supporting
structure and must not replace the wall removed. It is necessary
to position the boiler inside the wall. For safety reasons against
any leaks it is necessary to plaster the boiler housing in the brick
wall.

8
INSTALLATORE
UTENTEMANUTENTORE
N.B.: wall mounting of the indoor unit must
guarantee stable and efficient support for the
generator. e plugs (standard supply) are only to
be used to x the boiler 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.
ese indoor units are used to heat water to below
boiling temperature in atmospheric pressure.
ey must be connected to a central heating system
and domestic hot water circuit suited to their perfor-
mance and capacity.
Riskofdamage due tocorrosioncaused byunsuitable
combustion air and environment.
Spray, solvents, chlorine-based detergents, paints, glue,
ammonium compounds, powders and similar cause
product and ue duct corrosion.
- Check that combustion air power supply is free from chlorine,
sulphur, powders, etc.
- Make sure that no chemical substances are stored in the place
of installation.
- If you want to install the product in beauty salons, paint
workshops, carpenter’s shop, cleaning companies or
similar, choose a separate installation area that ensures
combustion air supply that is free from chemical substances.
- Make sure the combustion air is not fed from chimneys that
were used with gas boilers or other heating devices. In fact, these
may cause an accumulation of soot in the chimney.
Risk of material damageaerusingspraysand liquids
to search for leaks
Leak sprays and liquids clog the reference hole P1 (Fig.
52) of the gas valve, damaging it irreparably.
During installation and maintenance, do not use spray
or liquids in the upper area of the gas valve (side referring to the
electric connections)
“Anti-legionella” heat treatment of the storage tank
(activated by the specic function present on the
predisposed thermoregulation systems): during this
stage, the temperature of the water inside the storage
tank exceeds 60°C with a relative risk of burns. Keep
this domestic hot water treatment under control (and
inform the users) to prevent unforeseeable damage to people,
animals, things. If required install a thermostatic valve on the
domestic hot water outlet to prevent scalding.
Filling the condensate drain trap.
On rst lighting of the boiler, ue gas
may come out from the condensate drain;
aer a few minutes’ operation, check that
this no longer occurs. is means that the drain
trap is lled with condensate to the correct level
preventing the passage of ue gas.
ATTENTION:
-Type B open chamber indoor units
must not be installed in places where
commercial, artisan or industrial activities
take place, which use products that may de-
velop 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 indoor unit and jeopardise operation.
-Unless otherwise provided for by local reg-
ulations in force, congurations B23 and B53:
the boilers must not be installed in bedrooms,
bathrooms or bedsits. ey must neither be
installed in rooms containing solid fuel heat
generators nor in rooms communicating with
said rooms.
-e installation rooms must be permanently
ventilated, in compliance with the local reg-
ulations in force (at least 6 cm2for every kW
of installed heat input, except in the event of
any increases needed for electro-mechanical
vacuum cleaners or other devices that could
put the installation room under vacuum).
-Installation of appliances in B23 and B53 con-
guration is recommended in non-residential
premisesandwhich arepermanentlyventilated.
ATTENTION:
failure to comply with the above implies
personal responsibility and invalidates
the warranty.

9
INSTALLATORE
UTENTEMANUTENTORE
1.3 VICTRIX HYBRID INSTALLATION.
Victrix Hybrid must be installed as per the hydraulic diagram
(Fig. 2).
Basic requirements.
ATTENTION:
e minimum water content required
within the system is 20 litres; otherwise,
it will be necessary to install an inertial storage
tank (optional).
For proper system operation, make sure that
the minimum ow rate in operating conditions
never drops below 500 l/h.
ATTENTION:
When the circulation within each room
central heating loop is controlled by re-
motely operated valves, it is important
to guarantee the minimum water content (20
litres), even if all the valves are closed.
When the circulation within each or certain
room central heating loops is controlled by
remotely operated valves, it is important to
guarantee the minimum ow rate, even if all
the valves are closed. It is necessary to have
a loop that is always open on the system (by-
pass or non-intercepted zone), to allow some
functions such as, for example, the antifreeze
function.
ATTENTION:
Make sure that the expansion vessel
present in the indoor unit is sucient
for the hydraulic circuit; otherwise use the
optional vessel.
ATTENTION:
If you are using one or more booster
pumps it is essential to install a hydrau-
lic separator (not supplied by Immergas)
downstream of the indoor unit. e minimum
required 20l must be guaranteed between the
indoor unit and the hydraulic separator.
ATTENTION:
It is recommended to connect the ow
from heat pump (MHT) of the outdoor
unit to the system return (R) of the indoor unit.
ATTENTION:
With Victrix Hybrid, in case of connec-
tion to the storage tank unit, the return
present on the storage tank unit (RU) must be
connected to the return of the Outdoor unit
(RHT).
e storage tank unit return connection, pre-
sent in the indoor unit, is not used and must
be closed.
ATTENTION:
If installing a kit or servicing the
Victrix Hybrid, always empty the sy-
stem’s circuit rst so as not to compromise
the appliance’s electrical safety of the same
(see Par. 2.16).
Only for Audax.DK4.
ATTENTION:
the appliance operates with R32 refri-
gerant gas.
is gas is ODOURLESS.
Pay the utmost attention
Strictly follow the instruction handbook of the
Audax DK4 outdoor unit before installation
and any type of operation on the chiller line.
ATTENTION:
R32 refrigerant gas belongs to the low
ammability refrigerant category: class
A2L according to standard ISO 817. It
guarantees high performance with low
environmental impact. e new gas reduces
the potential environmental impact by one
third compared to R410A, having less eect
on global warning (GWP 675).

10
INSTALLATORE
UTENTEMANUTENTORE
2
Victrix Hybrid hydraulic diagram.
Key:
1 - Victrix 24HY Hybrid Indoor Unit
2 - Audax.DK4 Outdoor Unit
3 - Control panel
4 - Domestic hot water inlet shut-o
cock
5 - Gas interception cock
6 - Heat pump ow interception cock
with vent
7 - Heat pump return interception cock
with vent
8 - System
G - Gas supply
AC - Domestic hot water outlet
AF - DHW (Domestic hot water) water
inlet
SC - Condensate drain
M - System ow
R - System return
MHT - Flow from heat pump
RHT - Return to heat pump
SA - Outdoor unit water drain

11
INSTALLATORE
UTENTEMANUTENTORE
3
Victrix Hybrid Electrical connection diagram.
Key:
A23 - Outdoor Unit Audax.DK4
A33 - Vixtrix Hybrid control panel
B2 - Boiler probe (optional)
B9 - DHW inlet probe (optional - not available for this
model)
S20-230VAC - Room thermostat (optional)
For the correct connection of the power supply cable refer to Parag
1.11 of this manual.
A 230VAC (optional) room thermostat can be connected on ter-
minals 1 and 2 of the terminal block present in the indoor unit.
Consult Par 1.15. for connection.
To connect the Audax.DK4 outdoor unit to the control panel,
connect the communication cables from terminals “D+ - D-” of the
outdoor unit to terminals “5 - 6 “of the control panel. Consult the
relative instructions manual to access the electrical connections
of the outdoor unit.
To connect the communication BUS of the Victrix 24HY outdoor
unit to the control panel, connect the communication cables from
terminals “44 - 41” of the indoor unit to terminals “1 - 2” of the
control panel. To access the connection compartment, consult
Par. 1.11.
For low voltage power supply of the control pa-
nel, connect the communication cables from terminals
”24-25”presentonthe terminalblockofthe indoorunittoterminals
“7-8” of the control panel. To access the connection compartment,
consult Par. 1.11.
To connect the optional storage tank probe connect the cables to
terminals “38-48” present on the terminal block of the outdoor
unit. To access the connection compartment, consult Par. 1.11.
1 - Power supply
2 - Congurable relay

12
INSTALLATORE
UTENTEMANUTENTORE
Victrix Hybrid antifreeze protection.
Freezing may damage the system. To prevent free-
zing of the hydraulic components, Victrix Hybrid is
equipped with special antifreeze protection functions,
which include the activation of the pump and burner
of the indoor unit in case of low temperatures.
ese functions allow to protect the unit up to the minimum
temperatures indicated below:
-Outdoor unit: Minimum temperature -15°C.
-Indoor unit: Minimum temperature -5°C.
ATTENTION:
if the boiler is installed in places where
the temperature falls below 0°C the
domestic hot water and central heating at-
tachment pipes must be insulated.
Furthermore, if the control panel is used for room
temperature control (and a room thermostat is not
installed) there is also a room antifreeze function (see
Par. 3.22).
If the indoor unit must be installed in a place where
the minimum temperature may drop below -5°C, up
to -15°C, follow the instructions below to prevent
freezing:
- Protect the central heating circuit from freezing by
introducing an anti-freeze liquid into this circuit, as indicated
in the related paragraph. is will also protect the outdoor
unit and the whole central heating system.
- Protect the domestic hot water circuit of the indoor unit
against freezing by using an accessory that is supplied on
request (antifreeze kit) comprising an electric resistance, the
relevant wiring and a control thermostat (carefully read and
follow the installation instructions contained in the accessory
kit pack).
If the outdoor unit is installed in an area with temperatures
>5°C and high relative humidity for at least three consecutive
days, the optional anti-freeze resistance kit must be installed
to prevent the oor from freezing with condensate drain.
Freeze protection of the outdoor and indoor units by
means of the antifreeze function (including -15°C
protection of the DHW circuit with resistance kit) is
ensured only if::
- the indoor unit is correctly connected to gas the
power supply circuit
- the units and control panel are correctly connected to the
electrical power supply circuit and connected to one another;
- the units and control panel are constantly supplied with po-
wer;
- the indoor unit is not in “o” or “stand-by” mode
- the indoor and outdoor units are not malfunctioning (Par. 2.13);
- the antifreeze unit and/or kit essential components are not
faulty.
e warranty does not cover damage due to interruption of the
electrical power supply and failure to comply with that stated on
the following paragraph “-Antifreeze protection of the system
by adding antifreeze liquid”.
If the previous conditions are not followed (for exam-
ple in case of an interruption of the electrical power
supply), these antifreeze functions are not able to
guarantee the protection of the outdoor and indoor
unit against freezing.
erefore, the circuit must be protected from freezing, by
performing one of the following actions:
- Protect the central heating circuit from freezing by introdu-
cing an anti-freeze liquid as indicated in the related paragraph.
- Install the antifreeze protection valves, that drain the water
from the system before it freezes. e antifreeze protection
valve that protects the outdoor unit is provided as standard.
Necessity to install protection valves on the system to be
evaluated. For further details, refer to the relative section in
the manual for the installation of the outdoor unit.

13
INSTALLATORE
UTENTEMANUTENTORE
Antifreeze protection of the system by adding antifreeze liquid.
Protect the central heating circuit from freezing by
inserting a good-quality antifreeze liquid into this
circuit, which is specially suited for central heating
systems and which is manufacturer guaranteed not
to cause damage to the heat exchanger or other com-
ponents of the units.
e antifreeze liquid must not be harmful to one’s health.
e materials used for the central heating circuit of Immergas
units resist ethylene and glycol based antifreeze liquids (if the
mixtures are prepared perfectly). Adding glycol lowers the
freezing point of water.
e required concentration depends on the lowest expected
external temperature and if bursting or freezing risks on the
system must be prevented. More glycol is required to prevent
the system from freezing. Add glycol according to the indica-
tions of the table below.
An aqueous solution must be made with potential pollution
class of water 2 (EN 1717:2002).
For life and possible disposal, follow the supplier’s instructions.
INFORMATION
- Protection from risk of bursting: glycol prevents the
pipes from bursting, but it does NOT prevent freezing
of the liquid they contain.
- Protection from risk of freezing : glycol prevents freezing of
the liquid contained inside the pipes.
Lowest
expected
external tem-
perature
Prevention from
risk of bursting Prevention from
risk of freezing
–5°C 10% 15%
–10°C 15% 25%
–15°C 20% 35%
–20°C 25% —
–25°C 30% —
NOTE
- e required concentration may vary according
to the type of glycol. ALWAYS compare the requi-
rements of the table above with the specications
provided by the glycol manufacturer. If necessary,
comply with the requirements provided by the glycol
manufacturer.
- e concentration of additional glycol must NEVER exceed
35%.
- If the liquid in the system should feeze, the pump will NOT
be able to start. Remember that the risk of freezing of the
liquid in the system is present if even if the bursting risk of
the system is prevented.
ATTENTION:
The presence of glycol may trigger
corrosion of the system, since glycol
without inhibitors becomes acid under the
inuence of oxygen. e process is accele-
rated by the presence of copper and high
temperatures. Non-inhibited acid glycol
aects metallic surfaces and creates galvanic
corrosion cells that cause serious damage to
the system.
erefore, it is important that:
- a proper water treatment is performed by a
specialised technician,
- a glycol with corrosion inhibitors able to
contrast the acids formed by glycol oxidation
is selected,
- car glycol is not used, since its corrosion
inhibitor has a limited duration and contains
silicates which may obstruct or clog the sy-
stem,
- galvanised pipes are NOT used in systems
with glycol, since their presence may cause
some components in the inhibitor to be cor-
roded by glycol.
If the hydraulic circuit contains glycol, the corre-
sponding function must be enabled (see Par 3.6).

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4
1.4 OUTDOOR UNIT INSTALLATION.
For the installation of the outdoor unit use the instructions manual
for Audax.DK4.

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5
6
1.5 INDOOR UNIT MAIN DIMENSIONS.
1.6 MINIMUM INDOOR UNIT INSTALLATION DISTANCES
Key:
A - 450 mm
B - 350 mm
C - 30 mm
D - 30 mm
E - 350 mm
Key:
V - Electrical connection
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
SC - Condensate drain (minimum
internal diameter Ø 13 mm)
M- System ow
R - System return
Height
(mm)
Width
(mm)
Depth
(mm)
Profondità
(mm)
748 440 268
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”

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7
1
2
3
3
8
1
4
2
2
9
1
4
5
6
5
6
1.7 INSTALLATION OF THE OUTDOOR UNIT IN THE
RECESSED FRAME OPTIONAL.
e indoor unit is designed to be installed in the Immergas reces-
sed frame (supplied as optional) only coupled with the enlarged
door kit.
To install proceed as follows:
- Install the bracket (2) inside the recessed frame xing it with the
screws (3) in the pre-drilled holes (Fig. 7).
- Hang the boiler (4) to the bracket (2) (Fig. 8).
- Block the boiler (4) by mounting the brackets (5) and xing them
with their screws (6) (Fig. 9).
e brackets (5) used to centre the boiler on the frame and hold
it in place stop against the frame (1) so do not require xing to
the frame itself.

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10
1
2
3
G
V
AC
AF
R
SC
M
4
1.8 INDOOR UNIT CONNECTION UNIT.
e connection unit is supplied as standard.
Perform the hydraulic and gas system connection of the device
in compliance with the instructions in (Fig. 10 according to the
type of installation to be made.
1.9 INDOOR UNIT GAS CONNECTION.
Our indoor units are designed to operate with methane gas (G20)
and LPG. Supply pipes must be the same as or larger than the
tting.
ATTENTION:
Before connecting the gas line, carefully
clean inside all the fuel feed system pi-
pes to remove any residue that could impair
the eciency of the indoor unit. Also make
sure the gas corresponds to that for which the
indoor unit is prepared (see data nameplate).
If dierent, it must be converted for operation
with the other types of gas (see converting
appliance for other gas types). It is also im-
portant to check the dynamic pressure of the
mains (methane or LPG) used to supply the
indoor unit, which must comply with EN 437
and its attachment, as insucient levels may
reduce generator output and cause discomfort
to the user.
According to local regulations in force,
make sure that a gas cock is installed
upstream of each connection between
the appliance and the gas system. is cock,
if supplied by the appliance’s manufacturer,
can be directly connected to the appliance
(i.e. downstream from the pipes connecting
the system to the appliance), according to the
manufacturer’s instructions.
e Immergas connection unit, supplied as
an optional kit, also includes the gas cock,
whose installation instructions are provided
in the kit.
In any case, make sure the gas cock is connect-
ed properly.
e gas supply pipe must be suitably dimensioned according to
current regulations in order to guarantee correct gas ow rate to
the burner even in conditions of maximum generator output and
to guarantee appliance eciency (technical specications). e
coupling system must conform to standards in force (EN 1775).
ATTENTION:
e indoor unit was designed to operate
with combustible gas free of impurities;
otherwise it is advisable to t special lters
upstream of the indoor unit to restore the
purity of the fuel.
Key:
V - Electrical connection
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
SC - Condensate drain (minimum internal
diameter Ø 13 mm)
M - System ow
R - System return
1 - System lling valve
2 - System draining valve
3 - 3 bar safety valve drain tting signal
4 - Air vent valve drain

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Storage tanks (in case of supply from LPG depot).
- New LPG storage tanks may contain residual inert gases (nitro-
gen) 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 caloric value of the
mixture delivered to the appliance, with subsequent change in
its performance.
1.10 HYDRAULIC CONNECTION.
In order not to void the product warranty, before
making unit connections, carefully clean the heating
system (pipes, radiators, etc.) with special pickling or
de-scaling products to remove any deposits that could
jeopardise proper unit operation.
A treatment of the heating and water 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. scale),
slurry or other hazardous deposits.
Indoor Unit hydraulic connection.
Water connections must be made in a rational way using the cou-
plings on the indoor unit template. e safety valve outlet of the
indoor unit must be connected to a draining funnel. Otherwise,
the manufacturer of the indoor unit declines any responsibility
in case of ooding if the drain valve cuts in.
ATTENTION:
the manufacturer declines all liability
in the event of damage caused by the
installation of an automatic lling system.
In order to meet the system requirements established by EN 1717
in terms of pollution of drinking water, we recommend installing
the anti-backow kit to be used upstream of the cold water inlet
connection of the boiler. We also recommend using a category 2
3 heat transfer uid (ex: water + glycol) in the boiler’s primary
circuit (CH circuit), as dened in standard EN 1717.
To preserve the duration of the indoor unit 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.
3 bar safety valve.
Discharge of the safety valve has been conveyed to the condensate
drain trap outlet. Consequently, in the event of valve intervention,
the discharged liquid will end up in the sewer system through the
drain pipe of the condensate drain trap.
In any case the lower part of the appliance is tted with a drain
tting (Ref. 3 Fig. 10) with the relative closure cap to check for
the presence of liquid in the discharge circuit and to check the
intervention of the 3 bar safety valve.
Condensate drain.
To drain the condensate produced by the appliance, it is necessary
to connect to the drainage system by means of acid condensate
resistant pipes, with an internal Ø of at least 13 mm. e system
connecting the appliance to the drainage system must be carried
out in such a way as to prevent occlusion and freezing of the liquid
contained in it. Before appliance ignition, ensure that the con-
densate can be correctly removed. Aer rst ignition, check that
the drain trap is lled with condensate (Para. 1.31). Also, comply
with national and local regulations on discharging waste waters.
In the event condensate is not discharged into the wastewater
drainage system, a condensate neutraliser must be installed to
ensure compliance with the parameters established by the legis-
lation in force.
ATTENTION:
If you are using one or more booster
pumps it is essential to install a hydrau-
lic separator (not supplied by Immergas)
downstream of the indoor unit.
Outdoor unit hydraulic connection.
For the hydraulic connection of the Audax.DK4 outdoor unit,
refer to the related instructions booklet

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11
b
2
3
d
a
1
c
2
1.11 ELECTRICAL POWER SUPPLY CONNECTION.
System electrical connection.
e Victrix 24HY indoor unit must be coupled with an Audax.
DK4 outdoor unit. ey must both be connected to the control
panel as indicated in the control panel. e Audax.DK4 outdoor
unit is supplied with 230 Vac with lines separated from the indo-
or unit with an IPX5D protection rating. Electrical safety of the
Victrix Hybrid heat pump is reached only when all the units are
correctly connected to an ecient earthing system as specied by
current safety standards.
ATTENTION:
e manufacturer declines any respon-
sibility for damage or physical injury
caused by failure to connect the indoor
unit to an ecient earthing system or
failure to comply with the reference standards.
Indoor Unit electrical connection.
• Open the control panel connections compartment (Fig. 11).
To carry out electrical connections, all you have to do is open
the connections compartment as follows:
- Disassemble the cover (Fig. 67).
- Disassemble the cover (b)
1) Loosen the screw (a).
2) Press the two hooks on the connections compartment cover.
3) Remove the cover (b) from the control panel (c).
- At this point, it is possible to access the terminal board (d).
Also ensure that the electrical installation corresponds to maxi-
mum absorbed power specications as shown on the boiler data
nameplate. e boilers are supplied complete with a “X” type
power cable without plug.
ATTENTION:
e power supply cable must be con-
nected to a 230V ±10% / 50Hz mains
supply respecting L-N polarity and
earth connection; this network must
also have a multi-pole circuit breaker
with class III overvoltage category in
compliance with installation regulations.
To protect from possible dispersions of DC voltage, it is necessary
to provide a type A dierential safety device.
If the power cable is damaged, contact a qualied company (e.g.
the Authorised Aer-Sales Centre) for its replacement to avoid
a hazard.
e power cable must be laid as shown (Fig. 10).
If the network fuse on the integrated P.C.B. needs replacing, this
must also be done by qualied personnel: use a 3.15 A F (fast) 250
V fuse (size 5 x 20).
For the main power supply to the appliance, never use adapters,
multiple sockets or extension leads.
Make the various electrical connections according to your needs.
Outdoor unit electrical connection.
For the electrical connection of the Audax.DK4 outdoor unit, refer
to the related instructions booklet.

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1.12 CONTROL PANEL MAIN DIMENSIONS.
1.13 CONTROL PANEL INSTALLATION OPERATIONS.
1) Separate the xing template from the body of the remote panel
using a screwdriver as a lever in the relative recess (Fig. 13). In-
stall the remote panel away from heat sources and in a suitable
position to detect the room temperature correctly.
2) Install the remote panel using the openings on its rear part
directly onto the wall or on a recess box using the relative sup-
plied screws.
3) Connect the remote panel to the electronic management clamps,
as indicated in the wiring diagram.
e connection is made using wires with a minimum section of
0.50 mm2 and maximum section of 1.5 mm2 and with a maxi-
mum length of 50 metres.
For correct installation, prepare a dedicated line to
connect the control panel according to the Standards
in force regarding electrical systems. If this is not
possible, interference due to other electric cables
could cause malfunctioning of the control panel itself.
4) Fix the body of the remote control to the mount template,
engaging it with pressure.
5) Aer the Victrix Hybrid devices have been powered, wait about
30 seconds before regulation so that communication between
control panel and the Victrix Hybrid devices has established.
1.14 EXTERNAL TEMPERATURE PROBE.
In the outdoor unit there is an external probe as standard. is
may be used by the control panel to manage temperature control.
Optional external probes may not be connected to the
indoor or outdoor units.