Ferroli OMNIA S 3.2 Mounting instructions

INSTALLATION, MAINTENANCE AND USER MANUAL
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Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
WAAL-HUNG INDOOR UNITS
FOR REVERSIBLE SPLIT HEAT PUMPS WITH DC INVERTER COMPRESSOR
3541V950

2EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
• Read the warnings in this instruction booklet carefully since they pro-
vide important information on safe installation, use and maintenance.
• This instruction booklet is an integral and essential part of the product
and must be kept with care by the user for future reference.
• If the unit is sold or transferred to another owner or if it is to be moved,
always make sure the booklet stays with the appliance so that it can be
consulted by the new owner and/or installer.
• Installation and maintenance must be carried out by professionally qua-
lified personnel, according to current regulations and the manufactu-
rer's instructions.
• Incorrect installation or inadequate maintenance can result in damage
or injury. The manufacturer declines any liability for damage caused
by errors in installation and use or by failure to follow the instructions
provided.
• Before carrying out any cleaning or maintenance operation, disconnect
the unit from the power supply using the system switch and/or the spe-
cial cut-off devices.
• In case of a fault and/or poor operation, deactivate the unit and do
not try to repair it or directly intervene. Contact professionally qualified
personnel. Any repair/replacement of the products must only be carried
out by qualified personnel using genuine parts. Failure to comply with
the above cancompromise the safety of the unit.
• Periodic maintenance performed by qualified personnel is essential in
order to ensure proper operation of the unit.
• This unit must only be used for its intended purpose. Any other use is
deemed improper and therefore hazardous.
• After unpacking, check the good condition of the contents. The packing
materials are potentially hazardous and must not be left within the
reach of children.
• The unit can be used by children aged at least 8 years and by per-
sons with reduced physical, sensory or mental capabilities, or lacking
experience or the necessary knowledge, only if under supervision or
they have received instructions on its safe use and the related risks.
Children must not play with the unit. Cleaning and maintenance inten-
ded to be done by the user can be carried out by children aged at least
8 years only if under supervision.
• In case of doubt, do not use the unit. Contact the supplier.
• The unit and its accessories must be appropriately disposed of in com-
pliance with current regulations.
• The images given in this manual are a simplified representation of the
product. In this representation there may be slight and insignificant dif-
ferences with respect to the product supplied.
The CE marking certifies that the products meet the essential requirements of the relevant directives in force.
The declaration of conformity may be requested from the manufacturer.
This symbol, which is used on the product, packaging or documents, means that at the end of its useful life, this product must Mnot be collected,
recycled or disposed of together with domestic waste.
Improper management of electric or electronic waste can lead to the leakage of hazardous substances contained in the product. For the purpose
of preventing damage to health or the environment, users are kindly asked to separate this equipment from other types of waste and to ask for it
to be dealt with by the municipal waste service or dealer under the conditions and according to the methods set down in national and international
laws transposing the Directive 2012/19/EU.
Separate waste collection and recycling of unused equipment helps to save natural resources and to guarantee that this waste is processed in a
manner that is safe for health and the environment. For more information about how to collect electric and electronic equipment and appliances,
please contact your local Council or Public Authority competent to issue the relevant permits.
Allowed uses
This series of heat pumps is designed to produce cold or hot water for use in hydronic systems for conditioning/heating purposes and production of domestic hot water
in an indirect way through an external storage boiler equipped with a heat exchanger.
Any use differing from this proper use or beyond the operating limits indicated in this manual is forbidden unless previously agreed with the manufacturer.
The manufacturer declines all responsibility for any inaccuracies in this manual due to printing or typing errors.
The manufacturer reserves the right to modify the products contents in this catalogue without previous notice.

3
EN
Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
SUMMARY
1. SAFETY PRECAUTIONS ............................................................................................4
1.1 Special requirements for R32 refrigerant ....................................................................... 5
1.2 Information servicing .................................................................................................... 12
2. GENERAL FEATURES..............................................................................................16
2.1 Presentation of the system........................................................................................... 16
2.2 Components supplied with the indoor unit ................................................................... 16
2.3 The control system ....................................................................................................... 17
3. TECHNICAL DATA AN PERFORMANCE .................................................................18
3.1 System technical data .................................................................................................. 18
3.2 ERP data ...................................................................................................................... 19
3.3 Operating limits heat pump .......................................................................................... 19
3.4 Available static pressure............................................................................................... 20
3.4.1 Heat pump circulator indoor unit .................................... 20
4. DIMENSIONAL AND PHYSICAL DATA ....................................................................21
5. GENERAL VIEW AND INTERNAL UNIT HYDRAULIC DIAGRAM ..........................22
6. SYSTEM EXEMPLARY SCHEMES...........................................................................23
7. INSTALLATION .........................................................................................................24
7.1 Inspections on arrival ................................................................................................... 24
7.1.1 Packing and storing .............................................. 24
7.1.2 Selecting the installation site and minimum operating area for indoor unit .... 24
7.2 Minimum plant water content and requirements for DHW boiler (not supplied with the unit) 25
7.3 Limits to the length and heigth difference of refrigerant pipes...................................... 26
7.4 Refrigerant connections ............................................................................................... 27
7.4.1 Airtight test and leakage detection................................... 28
7.4.2 Air purge with vacuum pump ....................................... 28
7.4.3 Heat insulation.................................................. 29
7.4.4 Refrigerant amount to be added .................................... 29
7.5 Hydraulic connections .................................................................................................. 29
7.5.1 Antifreeze plant, antifreeze uids, additives and inhibitors ................ 29
7.5.2 Water lter ..................................................... 29
7.5.3 Tips for a successful installation .................................... 30
7.5.4 Filling with water ................................................ 30
7.5.5 Water circuit anti-freeze protection .................................. 30
7.5.6 Water piping insulation ........................................... 31
7.6 Electrical connections................................................................................................... 31
7.6.1 Electrical data .................................................. 31
7.6.2 How to access to the electric box ................................... 33
7.6.3 User connections................................................ 34
Hydronic board ................................................... 34
P_o - For outside circulation pump or water pump zone 1.................. 36
Pumpc - Water pump of zone 2....................................... 36
Pd - DHW recirculation pump........................................ 36
Pumpsolar - Water pump of the solar circuit ............................. 36
SV2 - 3-way diverter valve for heat/cool ................................ 36
SV3 - 3-way mixing valve for zone 2 ................................... 36
TBH - Electrical heater for DHW boiler ................................. 37
H-L1-C - For room thermostat (high voltage) ........................... 37
HT-COM-CL - Room thermostat (Low voltage) ........................... 38
AHS1, AHS2 - For additional heat source control (GAS BOILER) ............ 39
EVU-SG - Photovoltaic input and smart grid ............................. 39
8. USER INTERFACE ....................................................................................................40
8.1 Key function description ............................................................................................... 40
8.2 Meaning of display icons .............................................................................................. 40
8.3 Switching ON and OFF DHW and plant ....................................................................... 41
8.4 HEAT, COOL and DHW setpoint settings..................................................................... 42
8.5 User menu.................................................................................................................... 43
8.5.1 Heat / Cool operating mode selection (Operation Mode) ................. 46
8.5.2 Hourly daily schedule (Preset Temp)................................. 46
Cool mode daily schedule (Preset Temp. Cool) .......................... 46
Heat mode daily schedule (Preset Temp. Heat) .......................... 46
Climatic curves (Weather Temp Set) ................................... 46
Modalità Economy (Eco Mode) ...................................... 46
8.5.3 DHW setting (Dhw settings) ....................................... 47
Antilegionella (Disinfect) ............................................ 47
Fast DHW (Fast Dhw) .............................................. 47
Tank heater (Tank Heater)........................................... 47
DHW pump (Dhw Pump Circ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.5.4 Options ....................................................... 47
Silent Mode (Silent Mode) .......................................... 47
Holiday mode (Holiday) ............................................. 48
Plant Backup Heater (Backup Heater) ................................. 48
8.5.5 Service information .............................................. 48
Error code (Error code) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Parameters (Parameters) ........................................... 48
Display.......................................................... 48
8.5.6 Operation Parameter (Operation Parameter) .......................... 48
9. START-UP AND CONFIGURATION ..........................................................................49
9.1 Dip switch setting ......................................................................................................... 49
9.1.1 Access to Service menu (For Serviceman) ............................ 49
9.2 Service parameters table ............................................................................................. 50
9.3 Climatic curves ............................................................................................................. 53
9.3.1 Temperature curves for heating mode and ECO heating mode ............ 53
Climatic curve 9 in heating mode settable by the user ..................... 53
9.3.2 Temperature curves for cooling mode ................................ 54
Climatic curve 9 in cooling mode settable by the user ..................... 54
10. TROUBLESHOOTING.............................................................................................55
10.1 General guidelines ..................................................................................................... 55
10.2 General symptoms ..................................................................................................... 55
10.3 Error codes................................................................................................................. 57
11. COMMISSIONING....................................................................................................60
11.1 Heat pump commissioning ......................................................................................... 60
11.1.1 Preliminary heat pump checks..................................... 60
Refrigerating part.................................................. 60
11.2 Setting to be done during the initial check of the product........................................... 60
11.3 Final check before turning on the unit ........................................................................ 60
11.4 Turn on the unit........................................................................................................... 60
12. MAINTENANCE.......................................................................................................60
12.1 General notes............................................................................................................. 60
Electrical cabinet .................................................. 61
Residual Risks.................................................... 61
12.2 Access to internal components................................................................................... 61
13. ELECTRICAL WIRING DIAGRAM INDOOR UNIT .................................................62
13.2.1 Electrical wiring diagram for indoor unit mod. 10-16 (1ph) ............... 62
13.2.2 Electrical wiring diagram for indoor unit mod. 16T (3ph) ................. 63
14. REFRIGERANT DIAGRAM .....................................................................................64

4EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
1. SAFETY PRECAUTIONS
The precautions listed here are divided into the following types. They are quite important, so be sure to follow them carefully.
Meanings of DANGER, WARNING, CAUTION and NOTE symbols.
DANGER
Indicates an imminently hazardous situation which if not avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation which if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which if not avoided, may result in minor or moderate injury.
It is also used to alert against unsafe practices.
NOTE
Indicates situations that could only result in accidental equipment or property damage.
Read these instructions carefully before installation. Keep this manual in a handy for future reference.
Improper installation of equipment or accessories may result in electric shock, short-circuit, leakage, fire or other damage to the equipment. Be sure to only use acces-
sories made by the supplier, which are specifically designed for the equipment and make sure to get installation done by a professional.
All the activities described in this manual must be carried out by a licensed technician. Be sure to wear adequate personal protection equipment such as gloves and
safety glasses while installation the unit or carrying out maintenance activities.
Contact your dealer for any further assistance.
Table. 1 - Information symbols
Symbol Explanation
This symbol shows that this appliance used a flammable refrigerant. If the refrigerant is leaked and exposed to an external ignition source,
there is a risk of fire.
This symbol shows that the operation manual should be read carefully
This symbol shows that a service personnel should be handling this equipment with reference to the installation manual.
This symbol shows that information is available such as the operating manual or installation manual.
WARNING
Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requi-
ring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in
the use of flammable refrigerants.

5
EN
Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
1.1 Special requirements for R32 refrigerant
WARNING
• Do NOT have refrigerant leakage and open flame.
• Be aware that the R32 refrigerant does NOT contain an odour.
WARNING
The appliance shall be stored so as to prevent mechanical damage and in a well-ventilated room without conti-
nuously operating ignition sources (example:open flames,an operating gas appliance) and have a room size as
specified below.
NOTE
• Do NOT re-use joints which have been used already.
• Joints made in installation between parts of refrigerant system shall be accessible for maintenance purposes.
WARNING
Make sure installation,servicing,maintenance and repair comply with instractions and with applicable legislation
(for example national gas regulation) and are executed only by authorised persons.
NOTE
Symbol mcdenotes the refrigerant charge of a single refrigerating system. Where multiple refrigerating systems are servicing the same space, the refrige-
rating system with the largest refrigerant charge shall be used.
• Pipework should be protected from physical damage.
• Installation of pipework shall be kept to a minimum.
If the total refrigerant charge in the system (mc) is <1.84 kg, there are no additional minimum floor area requiements.
If the total refrigerant charge in the system (mc) is ≥1.84 kg, you need to comply with additional minimum floor area requirements as describrd in the following flow chart.
a
A
B
≥VAmin
≥VAmin
≥1.8m
≥ 1,5m
fig. 1 - indoor unit installation
The area of A plus B has to be greater than or equal to 4.5 m2.
Legend
aIndoor unit
ARoom where the indoor unit is installed.
BRoom adjacent to room A.
VAmin n°2 openings (n°1 at the top and n°1 at the bottom) between Room A and Room B.
NOTE
Spaces connected by only drop ceilings, duct work, or similar connections shall not be considered a single space.
For units mounted higher than 1,6 m, spaces divided by partition walls which are no higher than 1,6 m shall be considered a single space.
For fixed appliances, rooms on the same floor and connected by an open passageway between the spaces can be considered a single room when deter-
mining compliance to Amin , if the passageway complies with all of the following .
• It is a permanent opening.
• It extends to the floor.
• It is intended for people to walk through.

6EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
yes
no
yes
no
Input from installer:
-Area of adjacent room B (AroomB) (m2)
Start
Use table 3 to calculate the
total minimum floor area (Amintotal)(m2)requi-
red for the total refrigerant charge (mc)
Input from installer:
-Total refrigerant charge (mc)(kg)
-Area of room A (AroomA) (m2)
Use table 2 to calculate the
maximum refrigerant charge (mmax)(kg)
allowed for room A.
The unit can be installed in room A, and
without further room size or ventilation
requirements.
Unit can be installed at room A if:
-2 ventilation openings (permanently open) are provided between room A and B, 1 at the top and 1 at the bottom.
-Bottom opening:The bottom opening must meet the minimum area requirements(VAmin).It must be as close as possible to the floor.If the ventilation
opening starts from the floor, the height must be ≥20mm. The bottom of the opening must be situated≤100mm from the floor. At least 50% of the required
opening area must be situated <200 mm from the floor. The entire area of the opening must be situated <300 mm from the floor.
-Top opening:The area of the top opening must be larger than or equal to the bottom opening. The bottom of the top opening must be situated at least 1.5
m above the top of the bottom opening.
-Ventilation openings to the outside are NOT considered suitable ventilation openings (the user can block them when it is cold).
Use table 4 and dm to calculate the
minimum opening area for natural
ventilation between room A and room
B(VAmin)(cm2)
Determine the refrigerant amount that
exceeds mmax(dm)(kg).(dm=mc-mmax)
Contact your dealer
mmax≥mc?
Amin total≤AroomA+AroomB?

7
EN
Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
The flow chart uses the following tables:
Table. 2 - Maximum refrigerant charge allowed in a room
A [m2] 0,5 1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9 9,5 10
mmax [kg] 0,21 0,41 0,62 0,83 1,04 1,24 1,45 1,66 1,87 2,07 2,28 2,49 2,62 2,72 2,82 2,91 3,00 3,09 3,17 3,25
NOTE
For wall mounted models, the value of “Installation height (H)” is considered 1800 mm to comply to IEC 60335-2-40:2018 Clause GG2.
For intermediate Aroom values(i.e. when Aroom is between two values from the table), consider the value that corresponds to the lower Aroom value from the
table. If Aroom=3,6 m2, consider the value that corresponds to “Aroom=3,5 m2”.
Table. 3 - Minimum floor area
mc [kg] 1,9 2 2,1 2,2 2,3 2,4 2,5
A
mintotal
[m
2
]4,58 4,83 5,07 5,31 5,55 5,79 6,03
NOTE
For wall mounted models, the value of “Installation height (H)” is considered 1800 mm to comply to IEC 60335-2-40:2018 Clause GG2.
For intermediate mc values (i.e. when mc is between two values from the table), consider the value that corresponds to the higher mc value from the table. If
mc=1,97kg , consider the value that corresponds to “mc=2kg”. Systems with total refrigerant charge lower than 1.84kg are not subjected to any room requi-
rements.
Table. 4 - Minimum venting opening area for natural ventilation
Subtable mc= 1,9 kg Subtable mc= 2,0 kg Subtable mc= 2,1 kg Subtable mc= 2,2 kg
AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin [cm2] AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin
[cm2]AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin [cm2]AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin [cm2]
0,5 0,21 1,69 395 0,5 0,21 1,79 419 0,5 0,21 1,89 442 0,5 0,21 1,99 465
1 0,41 1,49 347 1 0,41 1,59 370 1 0,41 1,69 394 1 0,41 1,79 417
1,5 0,62 1,28 299 1,5 0,62 1,38 322 1,5 0,62 1,48 345 1,5 0,62 1,58 369
2 0,83 1,07 250 2 0,83 1,17 274 2 0,83 1,27 297 2 0,83 1,37 320
2,5 1,04 0,86 202 2,5 1,04 0,96 225 2,5 1,04 1,06 248 2,5 1,04 1,16 272
3 1,24 0,66 153 3 1,24 0,76 177 3 1,24 0,86 200 3 1,24 0,96 223
3,5 1,45 0,45 105 3,5 1,45 0,55 128 3,5 1,45 0,65 152 3,5 1,45 0,75 175
4 1,66 0,24 57 4 1,66 0,34 80 4 1,66 0,44 103 4 1,66 0,54 127
4,5 1,87 0,03 8 4,5 1,87 0,13 32 4,5 1,87 0,23 55 4,5 1,87 0,33 78
5 2,07 0,03 6 5 2,07 0,13 30
Subtable mc= 2,3 kg Subtable mc= 2,4 kg Subtable mc= 2,5 kg
AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin [cm2] AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin
[cm2]AroomA [m2] mmax [kg] dm=mc-mmax [kg] VAmin [cm2]
0,5 0,21 2,09 489 0,5 0,21 2,19 512 0,5 0,21 2,29 535
1 0,41 1,89 440 1 0,41 1,99 464 1 0,41 2,09 487
1,5 0,62 1,68 392 1,5 0,62 1,78 415 1,5 0,62 1,88 439
2 0,83 1,47 344 2 0,83 1,57 367 2 0,83 1,67 390
2,5 1,04 1,26 295 2,5 1,04 1,36 319 2,5 1,04 1,46 342
3 1,24 1,06 247 3 1,24 1,16 270 3 1,24 1,26 294
3,5 1,45 0,85 198 3,5 1,45 0,95 222 3,5 1,45 1,05 245
4 1,66 0,64 150 4 1,66 0,74 173 4 1,66 0,84 197
4,5 1,87 0,43 102 4,5 1,87 0,53 125 4,5 1,87 0,63 148
5 2,07 0,23 53 5 2,07 0,33 77 5 2,07 0,43 100
5,5 2,28 0,02 5 5,5 2,28 0,12 28 5,5 2,28 0,22 52
6 2,49 0,01 3
NOTE
For wall mounted models, the value of “Installation height (H)” is considered 1800 mm to comply to IEC 60335-2-40:2018 Clause GG2.
Based on the value of mc(total refrigerant change of the system) use the subtable with the higher value, for instance if mc= 2,05 kg use subtable mc=2,1 kg
CAUTION
Frequency of Refrigerant Leakage Checks
For unit that contains fluorinated greenhouse gases in quantities of 5 tonnes of CO2 equivalent or more,but of less than 50 tonnes of CO2
equivalent,at least every 12 months, or where a leakage detection system is installed, at least every 24 months.
For unit that contains fluorinated greenhouse gases in quantities of 50 tonnes of CO2 equivalent or more, but of less than 500 tonnes of CO2
equivalentat least every six months, or where a leakage detection system is installed, at least every 12 months.
For unit that contains fluorinated greenhouse gases in quantities of 500 tonnes of CO2 equivalent or more,at least every three months, or
where a leakage detection system is installed,at least every six months.
Only certificated person is allowed to do installation, operation and maintenance.

8EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
DANGER
• Before touching electric terminal parts, turn off power switch.
• When service panels are removed, live parts can be easily touched by accident.
• Never leave the unit unattended during installation or servicing when the service panel is removed.
• Do not touch water pipes during and immediately after operation as the pipes may be hot and could burn your
hands. To avoid injury, give the piping time to return to normal temperature or be sure to wear protective gloves.
• Do not touch any switch with wet fingers. Touching a switch with wet fingers can cause electrical shock.
• Before touching electrical parts, turn off all applicable power to the unit.
WARNING
• Tear apart and throw away plastic packaging bags so that children will not play with them. Children playing with
plastic bags face danger of death by suffocation.
• Safely dispose of packing materials such as nails and other metal or wood parts that could cause injuries.
• Ask your dealer or qualified personnel to perform installation work in accordance with this manual. Do not in-
stall the unit yourself. Improper installation could result in water leakage, electric shocks or fire.
• Be sure to use only specified accessories and parts for installation work. Failure to use specified parts may
result in water leakage, electric shocks, fire, or the unit falling from its mount.
• Install the unit on a wall that can withstand its weight. Insufficient physical strength may cause the equipment
to fall and possible injury.
• Perform specified installation work with full consideration of strong wind, hurricanes, or earthquakes. Improper
installation work may result in accidents due to equipment falling.
• Make certain that all electrical work is carried out by qualified personnel according to the local laws and regu-
lations and this manual using a separate circuit. Insufficient capacity of the power supply circuit or improper
electrical construction may lead to electric shocks or fire.
• Be sure to install a ground fault circuit interrupter according to local laws and regulations. Failure to install a
ground fault circuit interrupter may cause electric shocks and fire.
• Make sure all wiring is secure. Use the specified wires and ensure that terminal connections or wires are pro-
tected from water and other adverse external forces. Incomplete connection or affixing may cause a fire.
• When wiring the power supply, form the wires so that the front panel can be securely fastened. If the front panel
is not in place there could be overheating of the terminals, electric shocks or fire.
• After completing the installation work, check to make sure that there is no refrigerant leakage.
• Never directly touch any leaking refrigerant as it could cause severe frostbite. Do not touch the refrigerant pipes
during and immediately after operation as the refrigerant pipes may be hot or cold, depending on the condition
of the refrigerant flowing through the refrigerant piping, compressor and other refrigerant cycle parts. Burns or
frostbite are possible if you touch the refrigerant pipes. To avoid injury, give the pipes time to return to normal
temperature or, if you must touch them be sure to wear protective gloves.
• Do not touch the internal parts (pump, backup heater, etc.) during and immediately after operation. Touching the
internal parts can cause burns. To avoid injury, give the internal parts time to return to normal temperature or, if
you must touch them, be sure to wear protective gloves.

9
EN
Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
CAUTION
Ground the unit.
Grounding resistance should be according to local laws and regulations.
Do not connect the ground wire to gas or water pipes, lightning conductors or telephone ground wires.
Incomplete grounding may cause electric shocks.
Gas pipes: Fire or an explosion might occur if the gas leaks.
Water pipes: Hard vinyl tubes are not effective grounds.
Lightning conductors or telephone ground wires: electrical threshold may rise abnormally if struck by a lightning
bolt.
Install the power wire at least 1 meter away from televisions or radios to prevent interference or noise.
(Depending on the radio waves, a distance of 1 meter may not be sufficient to eliminate the noise.)
Do not wash the unit. This may cause electric shocks or fire. The appliance must be installed in accordance with
national wiring regulations. If the supply cord is damaged, it must be replaced by the manufacturer, its service agent
or similarly qualified persons in order to avoid a hazard.
Do not install the unit in the following places:
• Where there is mist of mineral oil, oil spray or vapors. Plastic parts may deteriorate, and cause them to come
loose or water to leak.
• Where corrosive gases (such as sulphurous acid gas) are produced. Where corrosion of copper pipes or solde-
red parts may cause refrigerant to leak.
• Where there is machinery which emits electromagnetic waves. Electromagnetic waves can disturb the control
system and cause equipment malfunction.
• Where flammable gases may leak, where carbon fiber or ignitable dust is suspended in the air or where volatile
flammables such as paint thinner or gasoline are handled. These types of gases might cause a fire.
• Where the air contains high levels of salt such as near the ocean.
• Where voltage fluctuates a lot, such as in factories.
• In vehicles or vessels.
• Where acidic or alkaline vapors are present.
This appliance can be used by children 8 years old and above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they are supervised or given instruction on using the unit in a
safe manner and understand the hazards involved. Children should not play with the unit. Cleaning and user main-
tenance should not be done by children without supervision.
Children should be supervised to ensure that they do not play with the appliance.
If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified
person.
DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of such waste separately for
special treatment is necessary. Do not dispose of electrical appliances as municipal waste, use separate collection
facilities. Contact your local government for information regarding the collection systems available. If electrical ap-
pliances are disposed of in landfills or dumps, hazardous substance can leak into the groundwater and get into the
food chain, damaging your health and well-being.
The wiring must be performed by professional technicians in accordance with national wiring regulation and this
circuit diagram. An all-pole disconnection device which has at least 3mm separation distance in all pole and a resi-
dual current device(RCD) with the rating not exceeding 30mA shall be incorporated in the fixed wiring according to
the national rule.
Confirm the safety of the installation area (walls, floors, etc. ) without hidden dangers such as water, electricity, and
gas. Before wiring/pipes.
Before installation , check whether the user’s power supply meets the electrical installation requirements of unit
(including reliable grounding , leakage , and wire diameter electrical load, etc. ). If the electrical installation require-
ments of the product are not met, the installation of the product is prohibited until the product is rectified.
When installing multiple air conditioners in a centralized manner, please confirm the load balance of the three-phase
power supply, and multiple units are prevented from being assembled into the same phase of the three-phase power
supply.
Product installation should be fixed firmly, Take reinforcement measures, when necessary.

10 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
NOTE
About Fluorinated Gasses
• This air-conditioning unit contains fluorinated gasses. For specific information on the type of gas and the amount, please refer to the relevant label
on the unit itself. Compliance with national gas regulations shall be observed.
• Installation, service, maintenance and repair of this unit must be performed by a certified technician.
• Product uninstallation and recycling must be performed by a certified technician.
• If the system has a leak-detection system installed, it must be checked for leaks at least every 12 months. When the unit is checked for leaks, proper
record-keeping of all checks is strongly recommended.
WARNING
Be sure to adopt adequate measures to prevent the unit from being used as a shelter by small animals. Small ani-
mals making contact with electrical parts can cause malfunction, smoke or fire. Please instruct the customer to keep
the area around the unit clean.
Select an installation site where the following condition are satisfied and one that meets with your customer’s ap-
proval.
• Places that are well-ventilated.
• Places where the unit does not disturb next-door neighbors.
• Safe places which can bear the unit’s weight and vibration and where the unit can be installed at an even level.
• Places where there is no possibility of flammable gas or product leak.
• The equipment is not intended for use in a potentially explosive atmosphere.
• Places where servicing space can be well ensured.
• Places where the units’ piping and wiring lengths come within the allowable ranges.
• Places where water leaking from the unit cannot cause damage to the location.
• Places where rain can be avoided as much as possible.
• Do not install the unit in places often used as a work space. In case of construction work (e.g. grinding etc.)
where a lot of dust is created, the unit must be covered.
• Do not place any object or equipment on top of the unit (top plate)
• Do not climb, sit or stand on top of the unit.
• Be sure that sufficient precautions are taken in case of refrigerant leakage according to relevant local laws and
regulations.
• Don’t install the unit near the sea or where there is corrosion gas.
WARNING
• Ask your dealer for installation of the heat pump.
Incomplete installation performed by yourself may result in a water leakage, electric shock, and fire.
• Ask your dealer for improvement, repair, and maintenance.
Incomplete improvement, repair, and maintenance may result in a water leakage, electric shock, and fire.
• In order to avoid electric shock, fire or injury, or if you detect any abnormality such as smell of fire, turn off the
power supply and call your dealer for instructions.
• Never let the indoor unit or the controller get wet.
It may cause an electric shock or a fire.
• Never press the button of the controller with a hard, pointed object.
The controller may be damaged.
• Never replace a fuse with that of wrong rated current or other wires when a fuse blows out.
Use of wire or copper wire may cause the unit to break down or cause a fire.
• Never use a flammable spray such as hair spray, lacqueror paint near the unit.

11
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Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
It may cause a fire.
• Do not dispose this product as unsorted municipal waste. Collection of such waste separately for special tre-
atment is necessary.
Do not dispose of electrical appliances as unsorted municipal waste, use separate collection facilities.
Contact your local government for information regarding the connection systems available.
• If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwa-
ter and get into the food chain, damaging your health and well-being.
• To prevent refrigerant leak, contact your dealer.
When the system is installed and runs in a small room, it is required to keep the concentration of the refrigerant, if by any
chance coming out, below the limit. Otherwise, oxygen in the room may be affected, resulting in a serious accident.
• The refrigerant in the heat pump is safe and normally does not leak.
If the refrigerant leaks in the room, contact with a fire of a burner, a heater or a cooker may result in a harmful gas.
• Turn off any combustible heating devices, ventilate the room, and contact the dealer where you purchased the
unit.
Do not use the heat pump until a service person confirms that the portion where the refrigerant leaks is repaired.
CAUTION
• Do not use the heat pump for other purposes.
In order to avoid any quality deterioration, do not use the unit for cooling precision instruments, food, plants, animals or works
of art.
• Before cleaning, be sure to stop the operation, turn the breaker off or pull out the supply cord.
Otherwise, an electric shock and injury may result.
• In order to avoid electric shock or fire, make sure that an earth leak detector is installed.
• Be sure the heat pump is grounded.
In order to avoid electric shock, make sure that the unit is grounded and that the earth wire is not connected to gas or water
pipe, lightning conductor or telephone earth wire.
• Do not operate the heat pump with a wet hand.
An electric shock may happen.
• Do not place items which might be damaged by moisture under the indoor unit.
Condensation may form if the humidity is above 80%.
• After a long use, check the unit stand and fitting for damage.
If damaged, the unit may fall and result in injury.
• To avoid oxygen deficiency, ventilate the room sufficiently if equipment with burner is used together with the
heat pump.
• Arrange the drain hose to ensure smooth drainage.
Incomplete drainage may cause wetting of the building, furniture etc.
• Never touch the internal parts of the controller.
Do not remove the front panel. Some parts inside are dangerous to touch, and a machine trouble may happen.
• Never do the maintenances work by yourself.
Please contact your local dealer to do the maintenances work.
Adverse influence to little children, animals and plants may result.
• Do not allow a child to mount on the unit or avoid placing any object on it.
Falling or tumbling may result in injury.
• Do not operate the heat pump when using a room fumigation - type insecticide.
Failure to observe could cause the chemicals to become deposited in the unit, which could endanger the health of those who
are hypersensitive to chemicals.
• Do not place appliances which produce open fire in places exposed to the air flow from the unit or under the
indoor unit.
It may cause incomplete combustion or deformation of the unit due to the heat.
• Do not install the heat pump at any place where flammable gas may leak out.

12 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
If the gas leaks out and stays around the heat pump, a fire may break out.
• The appliance is not intended for use by young children or infirm persons without supervision.
• Young children should be supervised to ensure that they do not play with the appliance.
• The temperature of refrigerant circuit will be high, please keep the interconnection cable away from the copper
tube.
WARNING
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufac-
turer.
The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames,
an operating gas appliance or an operating electric heater. Do not pierce or burn .
Be aware that refrigerants may not contain an odour.
1.2 Information servicing
1) Checks to the area
Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minmised. For repair to the
refrigerating system, the following precautions shall be complied with prior to conducting work on the system.
2) Work procedure
Works shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or vapour being present while the work is being performed.
3) General work area
All mintenance staff and others working in the local area shall be instructed on the nature of work being carried out. work in confined sapces shall be avoided. The area
4) Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware
of potentially flammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. no sparking, adequately
sealed or intrinsically safe.
5) Presence of fire extinguisher.
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall be available to hand. Have a
dry power or CO2 fire extinguisher adjacent to the charging area.
6) No ignition sources
No person carrying out work in relation to a refrigerating system which involves exposing any pipe work that contains or has contained flammable refrigerant shall use
any sources of ignition in such a manner that it may lead to the risk of fire or explosion.
All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during
which flammable refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to make
sure that there are no flammable hazards or ignition risks. NO SMOKING signs shall be displayed.
7) Ventilated area
Ensure that the area is in the open or that it it adequately ventilated before breaking into the system or conducting any hot work.
A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel
it externally into the atmosphere.
8) Checks to the refrigerating equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times the manufacturer s maintenance and
service guidelines shall be followed. If in doubt consult the manufacturer s technical department for assistance. The following checks shall be applied to installations
using flammable refrigerants:
• The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are installed;
• The ventilation machinery and outlets are operating adequately and are not obstructed;
• If an indirect refrigerating circuit is being used, the secondary circuits shall be checked for the presence of refrigerant; marking to the equipment continues to be
visible and legible.
• Marking and signs that are illegible shall be corrected;
• Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance which may corrode refrigerant containing
components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against being so
corroded.

13
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Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
9) Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise
safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to
continue operation, and adequate temporary solution shall be used. This shall be reported to the owner of the equipment so all parties are advised.
Initial safety checks shall include:
• That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;
• That there no live electrical components and wiring are exposed while charging, recovering or purging the system;
• That there is continuity of earth bonding.
10) Repairs to sealed components
a) During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing,
then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous
situation.
b) Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered
in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections,
terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of flammable atmospheres. Re-
placement parts shall be in accordance with the manufacturer s specifications.
NOTE
The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment. Instrinsically safe
components do not have to be isolated prior to working on them.
11) Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the
equipment in use. Intrinscially safe components are the only types that can be worked on while live in the presence of a flammable atmosphere. The test apparatus
shall be at the correct rating. Replace components only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant in the atmosphere
from a leak.
12) Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also
take into account the effects of aging or continual vibration from sources such as compressors or fans.
13) Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a
naked flame) shall not be used.
The following leak detection methods are deemed acceptable for systems containing flammable refrigerants system.
Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need re-calibration.(Detection equipment shall
be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant. Leak detection equipment shall be
set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and the appropriate percentage of gas (25% maximum) is confirmed.
Leak detection fluids are also suitable for use with most refrig erants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work.
NOTE
Examples of leak detection flu ids are
• bubble method
• fluore scent method agents
If a leak is suspected, ali naked flames shall be removed/extinguished.
If a leakage of refrigerant is found which requires brazing, ali of the refrigerant shall be recovered from the system , or isolated (by means of shut off valves) in a part
of the system remote from the leak.
Removal of refrigerant shall be accord ing to Clause DD.9.
14) Removal and evacuation
When breaking into the refrigerant circuit to make repairs of for any other purpose conventional procedures shall be used, However, it is important that best practice
is followed since flammability is a consideration. The following procedure shall be adhered to:
• Remove refrigerant;
• Purge the circuit with inert gas;
• Evacuate;
• Purge with inert gas;
• Open the circuit by cutting or brazing.

14 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
The refrigerant charge shall be recovered into the correct recovery cylinders. For appliances containing flammable refrigerants, the system shall be purged with
oxygen-free nitrogen to render the appliance safe for flammable refrigerants . This process may need to be repeated several times . Compressed air or oxygen shall
not be used for purging refrigerant systems.
For appliances containing flammable refrigerants, refrigerants purging shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continu-
ing to fili until the working pressure is achieved, then venting to atmosp here, and finally pulling down to a vacuum . This process shall be repeated until no refrigerant
is within the system. When the final oxygen-free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable work to ta ke piace. This
operation is absolutely vital if brazing operations on the pipe-work are to take piace.
Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is available.
15) Charging procedures
In addition to conventional charging procedures, the following requirements shall be followed:
• Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the
amount of refrigerant contained in them.
• Cylinders shall be kept in an appropriate position according to the instructions.
• Ensure that the refrigerating system is earthed prior to charging the system with refrigerant.
• Label the system when charging is complete(if not already).
• Extreme care shall be taken not to overfill the refrigerating system.
Prior to recharging the system it shall be pressure tested with OFN. The system shall be leak tested on completion of charging but prior to commissioning. A follow up
leak test shall be carried out prior to leaving the site.
16) Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that
all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken. In case analysis is required prior to re-use of
recovered refrigerant. It is essential that electrical power is available before the task is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically
c) Before attempting the procedure ensure that:
• Mechanical handling equipment is available, if required, for handling refrigerant cylinders;
• All personal protetive equipment is available and being used correctly;
• The recovery process is supervised at all times by a competent person;
• Recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer s instructions.
h) Do not overfill cylinders. (No more than 80% volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all
isolation valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.
17) Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. Ensure that there are labels on
the equipment stating the equipment contains flammable refrigerant.
18) Recovery
When removing refrigerant from a system, either for service or decommissioning, it is recommended good practice that all refrigerants are removed safely.
When tranferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct numbers of cylinders for
holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant(i.e special cylinders
for the recovery of refrigerant). Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working order.
Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of
flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order.
Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order,
has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer
if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not mix
refrigerants in recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does
not remain within the lubricant. The evacuation process shall be carried out prior to retruning the compressor to the suppliers. Only electric heating to the compressor
body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.

15
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Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
20) Transportation, marking and storage for units
• General. The following information is provided for units that employ flammable refrigerants.
• Transport of equipment containing flammable refrigerants. Attention is drawn to the fact that additional transportation regulations may exist with respect to
equipment containing flammable gas. The maximum number of pieces of equipment or the configuration of the equipment permitted to be transported together
will be determined by the applicable transport regulations.
• Marking of equipment using signs. Signs for similar appliances used in a work area are generally addressed by local regulations and give the minimum requi-
rements for the provision of safety and/or health signs for a work location. All required signs are to be maintained and employers should ensure that employees
receive suitable and sufficient instruction and training on the meaning of appropriate safety signs and the actions that need to be taken in connection with these
signs. The effectiveness of signs should not be diminished by too many signs being placed together. Any pictograms used should be as simple as possible and
contain only essential details.
• Disposal of equipment using flammable refrigerants. See national regulations.
• Storage of equipment/appliances. The storage of the appliance should be in accordance with the applicable regulations or instructions, whichever is more
stringent.
• Storage of packed (unsold) equipment. Storage package protection should be constructed in such a way that mechanical damage to the equipment inside
the package will not cause a leak of the refrigerant charge. The maximum number of pieces of equipment permitted to be stored together will be determined by
local regulations.

16 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
2. GENERAL FEATURES
2.1 Presentation of the system
> GENERAL CHARACTERISTICS:
This series of air-water heat pumps satisfies the winter and summer air conditioning needs of residential and commercial systems of small and medium power and allows the pro-
duction of domestic hot water (DHW) through an external boiler.
All the units are suitable for split installation (which avoids the risk of freezing in particularly rigid outdoor applications) and are capable of producing water up to 65 ° C and can
therefore be used in radiant systems, fan coil units, radiators.
The user interface consists of a digital controller mounted on the indoor unit, equipped with a large display and simple setting commands.
> INDOOR UNIT FEATURES
• All the components (plate heat exchanger, circulator, etc.) and all the pipes of the hydraulic circuit are thermally insulated to avoid the formation of condensation and reduce
heat losses.
• Brazed stainless steel water / gas plate heat exchanger controlled and protected by temperature probes on both the water and refrigerant side
• Low consumption circulator with brushless DC motor
• System electric heater (3 kW single stage for mod. 4 - 6 - 8 - 10 - 12 - 14 - 16, 6 kW single stage for mod. 12T - 14T - 16T)
• Water flow switch
• Plant expansion vessel of 10 liters
• 3-way diverter valve for DHW production
• Automatic air vent
• Water pressure gauge
• 3 bar safety valve
• Water filter (Y-shape) supplied (not installed)
> OUTDOOR UNIT FEATURES
• Refrigerant circuit contained in a compartment sheltered from the air flow to facilitate maintenance operations
• Reduced inrush current thanks to Inverter technology
• Compressor with twin rotary DC INVERTER motor equipped with crankcase oil heater, positioned on anti-vibration rubber supports and wrapped in a double layer of sound-
absorbing material to minimize vibrations and noise
• DC inverter compressor that allows to modulate the capacity from 30 to 120% of the rated capacity
• Electronic biflow expansion valve
• Reverse cycle valve
• Axial fans with brushless DC motor complete with safety protection grilles
• Finned coil consisting of copper pipes and hydrophilic aluminium fins with anti-corrosion treatment
• The circuit is controlled by temperature probes and pressure transducers and protected by high and low pressure switches.
• All the units are equipped with variable speed control of the fans which allows operation with low external temperatures in cooling and high external temperatures in heating.
• External air temperature probe already installed on the unit.
> OUTDOOR UNIT ACCESSORIES
• AVG - Rubber antivibration dampers.
> SYSTEM ACCESSORIES
TP -Temperature probe: this is a probe that can be used to expand the control functions of the unit.
In fact, it can be used for:
• management of a 2-zone kit (direct and mixed) external to the unit for reading the mixed zone flow
• solar thermal management for reading the temperature of the solar collector
2.2 Components supplied with the indoor unit
Q.ty
Description Shape
Indoor unit 10 Indoor unit 16 - 16T
Installation, maintenance and user manual (this manual) 1 1
Water filter (Y-shape) 1 1
T5: temperature probe for the domestic hot water tank (cable length =10 m) 1 1
Energy label
Y IJA
IE IA
RVL-IPLUS 5
A
63 dB
7
5
kW
5
5
5
kW
5
811/20132015
B
C
D
E
F
G
A
35°C
A
A
++
+
+
55°C
+
A
++
- dB
1 1
Brass reduction fitting 3/8” SAE - 1/4” SAE 1 -

17
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Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
2.3 The control system
The user interface consists of a controller integrated into the indoor unit with a
multilingual menu that allows the management of:
• HEATING AND COOLING SYSTEM where the heat pump is the only energy
source. If the unit is activated in heating or cooling mode, it works by modula-
ting the compressor frequency to maintain the produced water temperature at
the set point value set by the controller.
• DOMESTIC HOT WATER PRODUCTION (DHW). The unit is activated in he-
ating mode to maintain the DHW external tank temperature at the set point
value.
• ADDITIONAL ENERGY SOURCES:
- System electric heater (IBH). Depending on the parameters set, it can be
activated in Integration or substitution of the heat pump when the system
serves the heating plant. The electronic board will activate the electric he-
ater if the heat pump does not work due to an alarm or due to reached
operating limits.
- Boiler (if installed). Depending on the parameters set, it can be activated
in Integration or substitution of the heat pump when the system serves the
plant in heating or DHW production. The electronic board will activate the
boiler if the heat pump does not work due to an alarm or due to reached
operating limits.
• ELECTRIC HEATER DHW TANK. In sanitary mode it can manage an electric
heater inserted in the DHW tank as an integration to the heat pump, anti-
legionella function, or as a backup energy source for DHW production if the
heat pump does not work due to an alarm or due to operating limits. The
DHW tank electric heater is essential for the anti-legionella function and for
the photovoltaic input function.
• FAST DHW. This function can be activated manually that allows you to give
priority to the domestic hot water by activating all the energy sources (heat
pump, electric resistances, boiler) available for DHW heating to bring the
DHW tank to the set point in the shortest possible time.
• ANTI-LEGIONELLA FUNCTION. It is possible to set anti-legionella weekly
cycles from the controller. In order to carry out these cycles correctly, the heat
pump must be integrated with the DHW tank or boiler electric heater.
• SILENT MODE. If active, it involves a reduction of the maximum compressor
frequency and fan speed to reduce the noise emitted and the power absorbed
by the unit. There are 2 levels of silencing. Through time programming, it is
possible to define the desired silencing level for 2 daily time bands (e.g. at
night).
• ON / OFF via an external contact. The unit can be activated and deactivated
(e.g. zone thermostat / remote switch) via an external contact: in this case the
unit will operate in the way set via the controller keyboard.
• HEATING / COOLING via external contacts. The unit can be activated and
deactivated in cooling and heating mode via 2 external contacts (eg. Zone
thermostat that manages the request for cooling and heating / remote switch).
• ECO. Possibility of warmly defining the time bands and relative setpoint for
the ECO mode.
• DAILY SCHEDULE. For both modes (cooling and heating) it allows differen-
tiated hourly programming for the day by defining the setpoint for each time-band.
• ANTIFREEZE PROTECTION. It is activated if the water temperature measu-
red by the temperature probes present in the indoor unit falls below 4 ° C: it
provides for the activation of the internal circulator and possibly the heat pump
in heating mode, and / or the electric heater for DHW boiler (if installed) and /
or the boiler (if installed).
• MANAGEMENT OF UP TO 2 ZONES (1 MIXED AND 1 DIRECT). The unit
is able to manage the pumps of both zones and. for the mixed zone only, the
mixing valve and the water delivery temperature probe.
• SOLAR THERMAL MANAGEMENT. The unit is able to manage the solar
pump and the temperature of the solar collector.
• PHOTOVOLTAIC INPUT AND SMART GRID INPUT. The unit is equipped
with 2 digital inputs for the management of an input from the photovoltaic
system and from the electricity grid. Working logic:
- if the photovoltaic input is closed, the unit activates the DHW mode with
DHW setpoint = 70 ° C and will activate the electric heater of the DHW tank
(if installed). The unit will continue to operate in cooling / heating mode with
the normal logic set.
- If the photovoltaic input is open and the smart grid input is closed, the unit
works normally.
- If the photovoltaic input is open and the smart grid input is open, the unit
deactivates the DHW mode and can operate in cooling / heating mode for
a defined period (which can be set via a parameter), then it will be deac-
tivated.
• CURRENT LIMITATION BY PARAMETER.
• REMOTE CONTROL OF THE UNIT VIA APP (available for IOS and Android).
• Detailed ERROR DIAGNOSTICS with historical alarms.
• DISPLAY OF ALL OPERATING PARAMETERS.
25 °C
45 °C
fig. 2 - user interface

18 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
3. TECHNICAL DATA AN PERFORMANCE
3.1 System technical data
-Models 4 6 8 10 12 14 16 12T 14T 16T UM
A7W35
Heating capacity nom 4,20 6,35 8,40 10,0 12,1 14,5 15,9 12,1 14,5 15,9 kW
Power input nom 0,82 1,28 1,63 2,02 2,44 3,15 3,53 2,44 3,15 3,53 kW
COP 5,10 4,95 5,15 4,95 4,95 4,60 4,50 4,95 4,60 4,50 W/W
Water flow rate 722 1092 1445 1720 2081 2494 2735 2081 2494 2735 l/h
Available static pressure 81 76 61 47 58 42 34 58 42 34 kPa
A7W45
Heating capacity nom 4,30 6,30 8,30 10,0 12,3 14,1 16,0 12,3 14,1 16,0 kW
Power input nom 1,13 1,70 2,16 2,67 3,32 3,92 4,57 3,32 3,92 4,57 kW
COP 3,80 3,70 3,85 3,75 3,70 3,60 3,50 3,70 3,60 3,50 W/W
Water flow rate 740 1084 1428 1720 2116 2425 2752 2116 2425 2752 l/h
Available static pressure 81 76 62 47 57 45 33 57 45 33 kPa
A7W55
Heating capacity nom 4,40 6,00 7,50 9,50 11,9 13,8 16,0 11,9 13,8 16,0 kW
Power input nom 1,49 2,03 2,36 3,06 3,90 4,68 5,61 3,90 4,68 5,61 kW
COP 2,95 2,95 3,18 3,10 3,05 2,95 2,85 3,05 2,95 2,85 W/W
Water flow rate 473 645 806 1021 1279 1484 1720 1279 1484 1720 l/h
Available static pressure 83 81 80 77 85 79 71 85 79 71 kPa
A35W18
Cooling capacity nom 4,50 6,50 8,30 9,90 12,0 13,5 14,9 12,0 13,5 14,9 kW
Power input nom 0,82 1,35 1,64 2,18 3,04 3,75 4,38 3,04 3,75 4,38 kW
EER 5,50 4,80 5,05 4,55 3,95 3,60 3,40 3,95 3,60 3,40 W/W
Water flow rate 774 1118 1428 1703 2064 2322 2563 2064 2322 2563 l/h
Available static pressure 80 75 62 48 58 49 40 59 49 40 kPa
A35W7
Cooling capacity nom 4,70 6,50 7,45 8,20 11,5 12,4 14,0 11,5 12,4 14,0 kW
Power input nom 1,36 2,17 2,22 2,52 4,18 4,96 5,60 4,18 4,96 5,60 kW
EER 3,45 3,00 3,35 3,25 2,75 2,50 2,50 2,75 2,50 2,50 W/W
Water flow rate 808 1118 1281 1410 1978 2133 2408 1978 2133 2408 l/h
Available static pressure 80 75 68 63 61 56 46 61 56 46 kPa
The values are referred to units without options and accessories.
Data declared according to EN 14511:
EER (Energy Efficiency Ratio) = ratio of the total cooling capacity to the effective power input of the unit
COP (Coefficient Of Performance) = ratio of the total heating capacity to the effective power input of the unit
A7W35 = source : air in 7°C d.b. 6°C w.b. / plant : water in 30°C out 35°C
A7W45 = source : air in 7°C d.b. 6°C w.b. / plant : water in 40°C out 45°C
A7W55 = source : air in 7°C d.b. 6°C w.b. / plant : water in 47°C out 55°C
A35W18 = source : air in 35°C d.b. / plant : water in 23°C out 18°C
A35W7 = source : air in 35°C d.b. / plant : water in 12°C out 7°C
Outdoor unit technical data 4 6 8 10 12 14 16 12T 14T 16T UM
Power supply 220/240-1-50 380/415-3-50 V-ph-Hz
Compressor type Twin Rotary DC -
N° compressors / N° refrigerant circuits 1 / 1 n°
Heat exchanger type stainless steel brazed plates -
Fans type DC axial -
N° fans 1 n°
Hydraulic fittings / liquid line 1/4” SAE / Ø 6,35 3/8” SAE / Ø 9,52 -
Hydraulic fittings / gas line 5/8” SAE / Ø 15,88 -
Refrigerant type R32 type
GWP 675 kg-CO2 eq.
Refrigerant factory charge ** 1,5 / 1,01 1,65 / 1,11 1,84 / 1,24 kg / t-CO2 eq.
Refrigerant lines (max length / max difference in height) 30 / 20 m
SWL - Sound power level
Heating *
A7W35 55 58 59 60 65 65 69 65 65 69 dB(A)
Max 60 61 61 62 65 65 69 65 65 69 dB(A)
Sil. 1 56 56 57 58 62 62 63 62 62 63 dB(A)
Sil. 2 53 53 55 55 56 56 56 56 56 56 dB(A)
SWL - Sound power level
Cooling *
A35W18 56 58 60 60 64 64 69 64 64 69 dB(A)
Max 60 61 61 62 65 65 69 65 65 69 dB(A)
Sil. 1 55 57 57 58 62 62 63 62 62 63 dB(A)
Sil. 2 52 54 54 54 56 56 56 56 56 56 dB(A)
Max. current input 12 14 16 17 25 26 27 10 11 12 A
Net weight 58 77 96 112 kg
* : SWL = Sound power levels, with reference to 1x10-12 W with unit operating in conditions:
A7W35 = source : air in 7°C d.b. 6°C w.b. / plant : water in 30°C out 35°C
A35W18 = source : air in 35°C d.b. / plant : water in 23°C out 18°C
Max = at maximum conditions in heating / cooling mode
Sil. 1 = if silent level 1 active in heating / cooling mode
Sil. 2 = if silent level 2 active in heating / cooling mode
The Total sound power level in dB(A) measured in compliance with ISO 9614 standards.
** The factory refrigerant charge allows a maximum length of the refrigeration lines of 15 meters. The maximum length of the refrigeration lines is 30 meters: in this case it is necessary to integrate the charge during
installation.

19
EN
Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
Indoor unit technical data 10 16 16T UM
Power supply 220/240-1-50 380/415-3-50 V-ph-Hz
Heat exchanger type Stainless steel brazed plates -
Pump type
Electronic circulator (8 mca) Electronic circulator (9 mca) -
System expansion tank volume 10 l
System safety water valve set 3 bar
System water connections 1” GAS F -
DHW water connections 3/4” GAS F -
Hydraulic fittings / liquid line *** 3/8” SAE / Ø 9,52 -
Hydraulic fittings / gas line 5/8” SAE / Ø 15,88 -
Minimum plant water content 15 25 l
DHW boiler - minimum surface of the coil
(minimum / recommended)
steel
1,4 / 2,5 1,75 / 4,0 m2
enamel 1,7 / 3,0 2,5 / 5,6 m2
System electric heater 3 6 kW
SWL - Sound power level 42 42 42 42 43 43 43 43 43 43 dB(A)
Max current input 14 10 A
Net weight 34 36 37 kg
*** For matching with external units mod. 4-6 a reduction fitting from 3/8 ”SAE to 1/4” SAE is provided for liquid line Ø 6.35.
3.2 ERP data
NOTA: Declared according to European regulation 811/2013. The values are referred to units without options and accessories.
Models 4 6 8 10 12 14 16 12T 14T 16T UM
Seasonal space
heating energy
efficiency class
low temperature (water outlet at 35°C) 191 195 205 204 189 185 182 189 185 182 ηs (%)
A+++
class
medium temperature (water at 55°C) 129 138 131 136 135 135 133 135 135 133 ηs (%)
A++
class
SCOP low temperature (water outlet at 35°C) 4,85 4,95 5,21 5,19 4,81 4,72 4,62 4,81 4,72 4,62 W/W
medium temperature (water at 55°C) 3,31 3,52 3,36 3,49 3,45 3,47 3,41 3,45 3,47 3,41 W/W
SEER water at 7°C 4,99 5,34 5,83 5,98 4,89 4,86 4,69 4,86 4,83 4,67 W/W
water at 18°C 7,77 8,21 8,95 8,78 7,10 6,90 6,75 7,04 6,85 6,71 W/W
3.3 Operating limits heat pump
-
-
-
-
-
-
NOTE FOR DHW MODE: leaving water temperature is the tem-
perature of the water produced by the unit and not the DHW tem-
perature available to the user; the DHW temperature is in fact a
function of this parameter and of the coil surface of the DHW boiler.
Operation range by heat pump with
possible limitation and protection.
Leaving water temperature °C
Leaving water temperature °C
Outside temperature °C
Outside temperature °C
DHW MODEHEATING MODE
Leaving water temperature °C
Outside temperature °C
COOLING MODE
With IBH (system electric heater) installed. With IBH (system electric heater) installed.
Operation range by heat pump with possible limita-
tion and protection.
Operation range by heat pump with possible limita-
tion and protection.
Maximum inlet water temperature line for heat
pump operation.
Maximum inlet water temperature line for heat
pump operation.

20 EN Cod. 3541V950 - Rev. 00 - 05/2021
OMNIA S 3.2
3.4 Available static pressure
3.4.1 Heat pump circulator indoor unit
0
10
20
30
40
50
60
70
80
90
100
600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600
Prevalenza utile [kPa]
Portata [l/h]
OMNIA S - Prevalenza utile
Prev_ut 10 [kPa] Prev_ut 16 [kPa]
Mod. 16 - 16T
Mod. 10
Watel flow rate [l/h]
Available static pressure [kPa]
The graph provides the available static pressure granted by the internal circulator (P_i) a the maximum speed. The internal circulator speed is managed by the hydronic
board in order to insure the correct water temperature difference as in the table below:
Cooling mode Heating mode
For all set point Set point <50°C Set point >50°C
ΔT= T
Win
-T
Wout
558