Immergas TRIO PACK HYBRID 4 Product manual

IE
Instructions and warnings
Installer
User
Maintenance technician
TRIO PACK
HYBRID
4 - 6 - 9
Heatpumpconsistingof:
-indoorunit
UI TPH
-VICTRIX TERA24PLUS
condensing boiler
- outdoor condensing unit
AUDAX PRO 4 - 6-9V2
*1.046086ENG*
*1.046086ENG*

2

3
INDEX
Dear Customer.................................................................................. 4
General warnings ............................................................................. 5
Safety symbols used.......................................................................... 6
1 Installing the indoor unit.............................................7
1.1 Description of the product. ................................................ 7
1.2 Installation recommendations. .......................................... 7
1.3 Solar Container indoor unit main dimensions................ 9
1.4 Connection template. ........................................................ 10
1.5 Installation. ......................................................................... 11
1.6 Gas connection................................................................... 18
1.7 Hydraulic connection........................................................ 19
1.8 Safety valve drain. .............................................................. 19
1.9 Electrical connections to the main panel........................ 21
1.10 Chiller line installation...................................................... 22
1.11 TRIO PACK remote panel. ............................................... 23
1.12 Remote panel installation operations.............................. 23
1.13 Electrical connection......................................................... 23
1.14 Zone remote control (optional). ...................................... 26
1.15 MODBUS temperature and humidity room probes
(Optional). .......................................................................... 26
1.16 Dominus (Optional).......................................................... 27
1.17 Room chrono-thermostats (Optional)............................ 27
1.18 Humidistat ON/OFF (Optional)...................................... 27
1.19 External temperature probe (Optional).......................... 27
1.20 Temperature control setting. ............................................ 28
1.21 Antifreeze protection......................................................... 29
1.22 System lling....................................................................... 29
1.23 Operating limits. ................................................................ 30
1.24 Indoor unit start-up (ignition)......................................... 30
1.25 Circulation pump............................................................... 31
1.26 Domestic hot water Storage tank unit............................. 36
1.27 Kits available on request.................................................... 36
1.28 Main components kit......................................................... 37
2 Instructions for use and maintenance....................... 38
2.1 General warnings............................................................... 38
2.2 Cleaning and maintenance. .............................................. 39
2.3 Trio Pack Hybrid remote panel (main)........................... 39
2.3.1 System use........................................................................... 39
2.3.2 Operating mode. ................................................................ 40
2.3.3 Settings menu. .................................................................... 44
2.3.4 DHW (Domestic hot water) set setting. ......................... 48
2.3.5 Fault and anomaly warnings............................................. 48
2.4 Using the secondary zone Remote panel (optional). .... 54
2.5 Restore central heating system pressure. ........................ 54
2.6 Draining the system........................................................... 54
2.7 Draining the domestic hot water circuit......................... 54
2.8 Decommissioning.............................................................. 54
3 Maintenance and initial check instructions. ............. 55
3.1 General warnings............................................................... 55
3.2 Initial check......................................................................... 55
3.3 Yearly equipment check and maintenance. .................... 56
3.4 External unit nned air coil maintenance. ..................... 56
3.5 Hydraulic diagram............................................................. 57
3.6 Wiring diagram.................................................................. 58
3.7 Possible problems and their causes.................................. 64
3.8 System programming. ....................................................... 64
3.9 Programming and use of the zone remote panel........... 71
3.10 rs-485 modbus converter conguration. ........................ 71
3.11 First ignition parameter setting. ...................................... 72
3.12 DHW (Domestic hot water) BOOST function.............. 73
3.13 Anti-Legionella function................................................... 73
3.14 heat pump circulator function. ........................................ 73
3.15 Pump anti-block function................................................. 73
3.16 3-way anti-block system.................................................... 73
3.17 System setpoint correction function. .............................. 73
3.18 Photovoltaic function. ....................................................... 73
3.19 Zone 2 safety thermostat function................................... 73
3.20 Conjunction Mode............................................................. 74
3.21 Heat pump disabling function. ........................................ 74
3.22 Diverter valve management (summer / winter)
(optional). ........................................................................... 74
3.23 External probe setting (optional)..................................... 74
3.24 Manual drives ..................................................................... 74
3.25 Outdoor condensing unit test mode function. .............. 74
3.26 Outdoor Condensing Unit Pump Down Function. ...... 74
3.27 Supervision device conguration. ................................... 74
3.28 Yearly maintenance............................................................ 75
3.29 Decommissioning.............................................................. 75
4 Technical data............................................................. 76
4.1 Technical data tables.......................................................... 76
4.2 Trio Pack Hybrid 4 product che (in compliance
with Regulation 811/2013). .............................................. 78
4.3 Trio Pack Hybrid 6 product che (in compliance
with Regulation 811/2013). .............................................. 81
4.4 Trio Pack Hybrid 9 product che (in compliance
with Regulation 811/2013). .............................................. 84
4.5 Parameters for lling in the package che...................... 87

4
Dear Customer
Congratulations for having chosen a top-quality Immergas product, able to assure well-being and safety for a long period of time. As an
Immergas customer you can also count on a Qualied Authorised Aer-Sales Technical Assistance Centre, prepared and updated to guar-
antee constant eciency of your appliance. Read the following pages carefully: you will be able to draw useful tips on the proper use of the
device, compliance with 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.
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.

5
GENERAL WARNINGS
• is book containsimportantinformationforthe:
• Installer (section 1);
• User (section 2);
• MaintenanceTechnician(section 3).
• For instructions on the AUDAX PRO V2 outdoor condensing unit and VICTRIX TERA 24 PLUS boiler, please refer to the relevant in-
structionmanuals;
• euser mustcarefullyreadtheinstructions in thespecic section (sec.2).
• euser mustlimitoperations ontheappliance only tothose explicitly allowed inthe specic section.
• Every operation carried out on the heat pump (e.g. set up, inspection, installation and commissioning), must mandatorily be per-
formed by authorised personnel alone and in possession of a technical engineering or professional degree qualifying them to per-
formthese tasks.ey must also haveattended a refreshercourse acknowledged bycompetent authorities. is particularlyapplies
topersonalspecialised inC.H. andair-conditioningsystemsand qualied electricians who,dueto theirspecialised training, skills
and experienceareexpertsin thecorrect installationand maintenanceofC.H., cooling andair-conditioning systems.
• 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 succes-
sion ofownership.
• 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 withlegislation inforce, the systemsmustbedesignedbyqualied professionals,within thedimensionallimitsestablished
bythe Law.Installationand maintenance must be performedin compliance withthe regulationsin force, according tothe manufacturer's
instructions and by professionally qualied sta, intended as sta with specic technical skills in the system sector, as envisioned by the
Law.
• Improper installation or assembly of the Immergas appliance and/or components, accessories, kits and devices can cause unexpected
problems forpeople, animals and objects.Read the instructions provided with theproduct carefully to ensure proper installation.
• is instructions manualprovides technical information forinstalling Immergas products.As forthe other issues related totheinstalla-
tionofproducts(e.g.safety atthe workplace, environmental protection,accidentprevention),itisnecessary tocomplywith theprovisions
ofthe standards in force andthe principles ofgoodpractice.
• AllImmergas products areprotected with suitabletransportpackaging.
• ematerial must be storedin adryplace protectedfrom the weather.
• Damaged products must not be installed.
• e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and
thereforepotentiallydangerous.
• If errorsoccurduringinstallation,operationand maintenance,due to non-compliancewith technical laws in force, standards orinstruc-
tions contained in this booklet (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and ex-
tra-contractual liability forany damage andthe appliancewarrantyis invalidated.
• Maintenance must be carried out by skilled technical sta. For example, the Authorised Service Centre that represents a guarantee of
qualicationsand professionalism.
• In the eventof malfunctions,faults orincorrect operation, turn theapplianceoand contact an authorised company (e.g.theAuthorised
Technical Assistance Centre, which has specically trained sta and original spare parts). Do not attempt to modify or repair the appli-
ance alone.

6
SAFETY SYMBOLS USED
GENERIC HAZARD
Strictly follow all of the indications next to the pictogram. Failure to follow the indications can generate hazard situations
resulting in possible serious harm to the health of the operator and user in general, and/or serious material damage.
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.
WARNING FOR INSTALLER
Read the instruction booklet carefully before installing the product.
LOW FLAMMABILITY MATERIAL
e symbol indicates that the appliance contains low ammability material.
WARNINGS
Strictly follow all of the indications next to the pictogram. Failure to follow the indications can generate hazard situations
resulting in possible minor injuries to the health of the operator and user in general, and/or minor material damage.
ATTENTION
Read and understand the appliance’s instructions before performing any operation, carefully following the indications
provided. Failure to follow the indications can generate appliance malfunctions.
INFORMATION
Indicates useful tips or additional information.
EARTH TERMINAL CONNECTION
e symbol identies the appliance’s earth terminal connection point.
DISPOSAL WARNING
e user must not dispose of the appliance at the end of its service life as municipal waste, but send it to appropriate
collection centres.
PERSONAL PROTECTIVE EQUIPMENT
SAFETY GLOVES
SAFETY GOGGLES
SAFETY FOOTWEAR

INSTALLER
USERMAINTENANCE TECHNICIAN
7
TECHNICAL DATA
1INSTALLING THE INDOOR UNIT
1.1 DESCRIPTION OF THE PRODUCT.
Trio Pack Hybrid 4-6-9 is a hybrid heat pump consisting of:
- UI TPH indoor unit (hereinaer called, indoor unit or UI TPH).
- VICTRIX TERA 24 PLUS condensing boiler (hereinaer referred
to as boiler).
- Audax Pro 4-6-9 V2 outdoor condensing unit (hereinaer re-
ferred to as outdoor condensing unit or Audax Pro 4-6-9 V2).
Trio Pack Hybrid 4-6-9 is perfectly operational only if the two
units are correctly powered and interconnected.
e UI TPH indoor unit was designed solely for oor installation
for heating and air conditioning and to produce domestic hot
water for domestic use and similar purposes.
For normal operation is must be paired with one of the following
outdoor condensing units:
- Audax Pro 4 V2 outdoor condensing unit;
- Audax Pro 6 V2 outdoor condensing unit;
- Audax Pro 9 V2 outdoor condensing unit;
Accordingly, it is necessary to comply with all of the rules regard-
ing safety and the use of both appliances.
1.2 INSTALLATION RECOMMENDATIONS.
Operators who install and service
the appliance must wear the personal
protective equipment required by ap-
plicable law.
e place of installation of the appliance and relative
Immergas accessories must have suitable features
(technical and structural), such as to allow for (always
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 and special maintenance);
- removal (outdoors in the place for loading and transporting
the appliances and components) as well as their eventual
replacement with appliances and/or equivalent components.
Installation must be carried out according to regulation
standards, current legislation and in compliance with
local technical regulations and the required technical
procedures.
e appliance operates with R32 refrig-
erant gas.
is gas is ODOURLESS.
Pay the utmost attention
Strictly follow the instruction handbook of the
outdoor condensing unit before installation
and any type of operation on the cooling line.
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).
e manufacturer declines all liability in the event of
damage caused by appliances removed from other sys-
tems or for any non-conformities with such equipment.
Only professionally qualied companies are authorised
to install Immergas appliances.
Check the environmental operating conditions of all
parts relevant to installation, referring to this booklet.
If installing a kit or servicing the appliance, always emp-
ty the system’s domestic hot water circuit rst so as not
to compromise the appliance’s electrical safety (Par. 2.7).
Always disconnect the appliance from voltage and, depending
on the type of operation, decrease the pressure and/or bring it
to zero in the gas and DHW circuits.
Before installing the appliance, ensure it has been
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.
Keep all ammable objects away from the appliance
(paper, rags, plastic, polystyrene, etc.).
Any modication to the appliance that is not explicitly
indicated in this section of the booklet is forbidden.

INSTALLER
USERMAINTENANCE TECHNICIAN
8
TECHNICAL DATA
Installation Standards.
is indoor unit, if installed in an external wall, requires
the use of the special “Solar Container” to be xed with
the support brackets supplied together with the package
itself. In combination with the "Solar Container" it was not de-
signed to be installed on plinths or oors. It was not designed
to be installed without the special recessed frame.
e installation of the “Solar Contain-
er” in the wall must ensure a stable and
ecient support of the UI TPE. e UI
TPE ensures appropriate support only if in-
stalled correctly (according to the rules of good
practice), following the instructions on its in-
structions leaet. e “Solar Container” for UI
TPE is not a supporting structure and cannot
replace the piece of wall removed. It is there-
fore necessary to check its correct positioning
inside the wall. For safety reasons against any
leaks it is necessary to plaster the pack housing
in the brick wall. is pack is used to heat water
to below boiling temperature in atmospheric
pressure. It must be connected to a central
heating system and domestic hot water circuit
suited to its performance and capacity.
If it is planned to be installed with the use of the special
“Domus Container”, the indoor unit must be installed
in an environment in which the temperature cannot
fall below 0°C.
Do not expose the indoor unit to atmospheric agents.
Do not install in places/rooms that
constitute public areas of apartment
buildings, internal stairways or other
escape routes (e.g. oor landings, entrance
halls, etc.).
To prevent electrocution, re or injury,
always switch o the unit, disable the
protective switch and, if smoke escapes
or if the unit is extremely noisy, contact an
Authorised Aer-Sales Technical Assistance
Centre.
Do not install in places where there is
the risk of combustible gas escaping.
Do not install near sources of heat.
Pay attention not to generate sparks as
follows:
- Do not remove the fuses while the
unit is on.
- Do not unplug the unit while it is on.
It is recommended to install the outlet high
up. Lay the cables in such a way that they do
not get tangled.
is indoor unit is used to heat water to below boiling
temperature in atmospheric pressure.
ey must be connected to a central heating system and
domestic hot water circuit suited to their performance
and capacity.
e appliance is built to also operate in
cooling mode.
If cold water production, during sum-
mer, could interfere and damage the central
heating only systems, necessary precautions
must be taken to prevent that an unintentional
production of cold water enters the heating
only system.
Failure to comply with the above im-
plies personal responsibility and inval-
idates the warranty.
“Anti-legionella” thermal treatment of the accumulation stor-
age tank unit.
e anti-legionella function is programmed directly
on the panel.
During this phase, the temperature of the water inside the tank
exceeds 60°C with the subsequent 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.

1
INSTALLER
USERMAINTENANCE TECHNICIAN
9
TECHNICAL DATA
1.3 SOLAR CONTAINER INDOOR UNIT MAIN DIMENSIONS.
Height (mm) Width (mm) Depth (mm)
2200 950 350
Inertial storage tank
connection
ermal solar systems
circuit connecting
bracket
Connection
inertial storage tank
Coolant connection
inlet (LP2 - GP2)

2
INSTALLER
USERMAINTENANCE TECHNICIAN
10
TECHNICAL DATA
1.4 CONNECTION TEMPLATE.
Attention: the indicated values refer to the stickers applied inside the recessed frame.
Key:
G - Gas supply
AC - Domestic hot water outlet
AF - DHW (Domestic hot water) water inlet
MHT - Flow from heat pump
RHT - Return to heat pump
RHT2 - Return to heat pump
(Victrix Hybrid Plus)
MHT2- Flow from heat pump
(Victrix Hybrid Plus)
LP - Chiller line - liquid phase
LP2 - Chiller line - liquid phase (Trio Pack)
RIGHT HAND SIDE CONNECTION
REAR CONNECTION
HEAT PUMP CONNECTION  INERTIAL STORAGE TANK 
VICTRIX HYBRID OUTDOOR UNIT
(For details of values see Fig. 1)
LOWER CONNECTION
GP - Chiller line - gaseous phase
GP2 - Chiller line - gaseous phase (Trio Pack)
MZ1 - Zone 1 system ow
MZ2 - Zone 2 system ow
RZ1 - Zone 1 system return
RZ2 - Zone 2 system return
RC - DHW (Domestic hot water) recirculation
SC - Condensate drain
V - Electrical connection
VCR - Main
remote panel electrical connection
VS - 3 bar discharge valve
FLOW AND RETURN FOR
INERTIAL STORAGE TANK
Height (Solar/Domus)
(mm)
Width (Solar/Domus)
(mm)
Depth (Solar/Domus)
(mm)
2200/2110 950/975 350/365
CONNECTIONS
CHILLER
LINE
WATER
DOMESTIC CW
RECIRCULA-
TION SYSTEM
LP GP AC - AF RC RP - MP RZ1 - MZ1 RZ2 - MZ2
SAE 1/4” SAE 5/8” G 1/2" G 3/4" G 3/4" G 3/4" G 3/4"

3
d
b1
b2
a
c
b1
b2
d1
b
e
b3
INSTALLER
USERMAINTENANCE TECHNICIAN
11
TECHNICAL DATA
a
1
A
Installation drawings key:
Unmistakeable component identication
Sequential identication of the operation to perform
Identication of generic or not supplied component
1.5 INSTALLATION.
Indoor unit composition.
Ref. Description Q.ty
a Storage tank unit 1
b Management electronics unit 1
b1 Mount brackets for Solar Container 1
b2 Mount brackets for Domus Container 1
b3 Electronics unit mount bracket with hinges 1
c 1-zone hydronic group (or 2 zones optional) 1
d Accessories and screws 1
d1 Remote panel 1
e Victrix Tera 24 Plus Boiler 1

4
1
2
3
3
4
C
A
B
INSTALLER
USERMAINTENANCE TECHNICIAN
12
TECHNICAL DATA
Installation operations.
Before installing the pack, open the “Solar Container” completely
by opening door (A) and blocking it to prevent it from getting in
the way during the following installation procedures.
Also remove the cover (B) and the side cover (C).

5
6
5
6
d2
7
a
INSTALLER
USERMAINTENANCE TECHNICIAN
13
TECHNICAL DATA
• Insert and block the storage tank unit retaining strip (d2) on the
screws tted on the Solar Container.
• Insert the storage tank unit (a) into the Solar Container with the
ange positioned on the right hand side and at the bottom, as
shown in Fig. 6.

7
8
b3
9
9
d4
d5
d5
d4
99
9
9
8
d4
d4
d4
b1
b3
b1
b1
d3
d3
d3
d2
a
D
11
10
INSTALLER
USERMAINTENANCE TECHNICIAN
14
TECHNICAL DATA
• Fix bracket (b3) to bracket (b1) with screws (d3) (Fig. 7).
• Tighten the brackets (b1) to the Solar Container using screws
(d4) and washers (d5) as shown in Fig. 7.
• Bend the strip (d2) around the storage tank unit (a) and fasten
it with the screw (D) (Fig. 8).

9
12
13
13
14
d6
c
d7
d7
14
INSTALLER
USERMAINTENANCE TECHNICIAN
15
TECHNICAL DATA
• Hang the hydronic unit (c) on the central bracket of the Solar
Container. Secure the position of the hydronic unit by fastening
the screws (d6) on the central bracket (Fig. 9).
N.B.: in the event that the installer
thinks it is necessary, it is possible to
secure the position of the hydronic unit
even further by using self-tapping screws (d7),
inserting them into the holes on the lower part
of the hydronic unit.
ATTENTION.
e xing screws (d6 and d7) are pres-
ent in the connection kit of the device
to be combined with the Trio Pack Hybrid.

10
E
F
16
F
15
15
16
ee
INSTALLER
USERMAINTENANCE TECHNICIAN
16
TECHNICAL DATA
Boiler installation operations.
• Tighten the bracket (E) to the special upper cross member with
screws (F).
• Hang the boiler (e) on the bracket (E) installed previously,
(Fig. 10).

11
a
c
AC
MU
MU
RU
e
d9 d8
INSTALLER
USERMAINTENANCE TECHNICIAN
17
TECHNICAL DATA
• Make the hydraulic connection between the storage tank unit
(a), hydronic unit (c) and boiler (e), as shown in Fig. 11.
Perform the connections in sequence, starting from the pipes
near the rear wall up to those near the installer, remembering
to insert the special gaskets supplied.
Install the probe (d8) using the special fairlead (d9).
N.B.: for easy electrical connection, move the power supply cable
of the boiler from the rear fairlead on the valve supporting plate
to the front fairlead of the same.

12
e
INSTALLER
USERMAINTENANCE TECHNICIAN
18
TECHNICAL DATA
1.6 GAS CONNECTION.
Perform the boiler gas connection (e, Fig. 11) using the special
pipe, cock and reducing coupling supplied and referring to the
connection template on the Solar Container or Domus Contain-
er (not supplied) and to the boiler operation and maintenance
manual.

d20
d21
d19
14
d19
d18
13
INSTALLER
USERMAINTENANCE TECHNICIAN
19
TECHNICAL DATA
1.7 HYDRAULIC CONNECTION.
Perform the hydraulic connection of the Trio Pack Hybrid, re-
ferring to the relative instruction sheet and to the connection
template on the Solar Container.
ATTENTION.
Before making the connections, care-
fully clean the heating system (pipes,
radiators, etc.) with special pickling or de-scal-
ing products to remove any deposits that could
compromise correct operation of the boiler,
hydraulic unit and storage tank unit.
N.B.: remove all the protection caps on
the ow and return pipes of the hydron-
ic unit, before making the hydraulic
connections.
e connections can be made directly using
the female couplings on the hydronic unit or
by inserting system cut-o cocks (optional).
ese cocks are particularly useful for mainte-
nance as they allow you to drain the hydronic
unit separately without having to empty the
entire system.
ATTENTION.
To preserve the duration of appliance
efficiency features, we recommend
installation of a suitable device for water
treatment in presence of water whose charac-
teristics can lead to the deposit of lime scale.
ATTENTION.
To preserve the correct operation of the
manifold inside the hydraulic circuit, it
is necessary to install an inspectable Y-lter,
present in the accessory boxes, on the return
of the zones.
1.8 SAFETY VALVE DRAIN.
8 bar domestic hot water safety valve.
Screw the tting (d10) onto the safety valve. Screw the funnel
(d11) onto the tting (d10) and convey the outlet to the drains.
Hydronic group 3 bar safety valve.
Tighten the rubber tting (d12) to the safety valve of the hydronic
group. Connect the silicone pipe (d13) to the tting (d11) and,
aer having cut it to size, insert it into the funnel (d11) as shown
in Fig. 14.
e appliance safety valves outlet must be connected to
a draining funnel.
Otherwise, the appliance’s manufacturer declines any
responsibility in case of ooding if the drain valves cut.
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.
Water connections must be made in a rational way using the
couplings on the indoor unit template.

15
b
19
b3
20 20
20
20 20
19
d22
d22
d22
INSTALLER
USERMAINTENANCE TECHNICIAN
20
TECHNICAL DATA
e 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
IMMERGAS anti-backow kit to be used upstream of the cold water
inlet connection of the indoor unit. We also recommend using cat-
egory 2 heat transfer uid (ex: water + glycol) in the primary circuit
(heating and/or cooling circuit), as dened in standard EN 1717.
To preserve the duration of appliance eciency fea-
tures, in the presence of water whose features can
lead to the deposit of lime scale, installation of the
“polyphosphate dispenser” kit is recommended (valid
only for Domus Container).
• Fit the electrical panel (b) on the bracket (b3) as shown in Fig. 14.
Once completed the installation, x everything with the screws
(d14).