Daikin FXFN50A2VEB User guide

Installer and user reference guide
CO₂ Conveni-Pack: indoor unit
FXFN50A2VEB
FXFN71A2VEB
FXFN112A2VEB

Table of contents
Installer and user reference guide
2
FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 – 2021.07
Table of contents
1 About the documentation 4
1.1 About this document ...................................................................................................................................................... 4
2 General safety precautions 5
2.1 About the documentation .............................................................................................................................................. 5
2.1.1 Meaning of warnings and symbols ................................................................................................................ 5
2.2 For the installer............................................................................................................................................................... 6
2.2.1 General ........................................................................................................................................................... 6
2.2.2 Installation site ............................................................................................................................................... 7
2.2.3 Refrigerant — in case of R744........................................................................................................................ 7
2.2.4 Electrical ......................................................................................................................................................... 9
3 Specific installer safety instructions 11
For the user 14
4 User safety instructions 15
4.1 General............................................................................................................................................................................ 15
4.2 Instructions for safe operation ....................................................................................................................................... 16
5 About the system 20
5.1 System layout.................................................................................................................................................................. 20
5.2 Information requirements for fan coil units................................................................................................................... 22
6 User interface 23
7 Before operation 24
8 Operation 25
8.1 Operation range.............................................................................................................................................................. 25
8.2 About operation modes.................................................................................................................................................. 25
8.2.1 Basic operation modes................................................................................................................................... 25
8.2.2 Special heating operation modes................................................................................................................... 26
8.2.3 Adjusting the airflow direction....................................................................................................................... 26
8.2.4 Active circulation airflow................................................................................................................................ 27
8.3 To operate the system.................................................................................................................................................... 27
9 Energy saving and optimum operation 28
10 Maintenance and service 29
10.1 Precautions for maintenance and service...................................................................................................................... 29
10.2 Cleaning the air filter, suction grille, air outlet and outside panels............................................................................... 30
10.2.1 To clean the air filter ...................................................................................................................................... 30
10.2.2 To clean the suction grille .............................................................................................................................. 31
10.2.3 To clean the air outlet and outside panels .................................................................................................... 32
10.3 Maintenance before a long stop period......................................................................................................................... 33
10.4 Maintenance after a long stop period............................................................................................................................ 33
10.5 About the refrigerant...................................................................................................................................................... 33
10.5.1 About refrigerant leak detection ................................................................................................................... 34
11 Troubleshooting 35
11.1 Symptoms that are NOT system malfunctions............................................................................................................... 36
11.1.1 Symptom: The system does not operate....................................................................................................... 36
11.1.2 Symptom: The fan speed does not correspond to the setting...................................................................... 36
11.1.3 Symptom: The fan direction does not correspond to the setting................................................................. 36
11.1.4 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 37
11.1.5 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 37
11.1.6 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 37
11.1.7 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 37
11.1.8 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 37
11.1.9 Symptom: Dust comes out of the unit........................................................................................................... 37
11.1.10 Symptom: The units can give off odours ....................................................................................................... 37
11.1.11 Symptom: In winter, indoor unit generates cold air and fan is turned ON regardless of setting ................ 38
12 Relocation 39
13 Disposal 40

Table of contents
Installer and user reference guide
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4P677925-1 – 2021.07
For the installer 41
14 About the box 42
14.1 Indoor unit ...................................................................................................................................................................... 42
14.1.1 To unpack and handle the unit ...................................................................................................................... 42
14.1.2 To remove the accessories from the indoor unit .......................................................................................... 42
15 About the units and options 44
15.1 Identification ................................................................................................................................................................... 44
15.1.1 Identification label: Indoor unit ..................................................................................................................... 44
15.2 About the indoor unit ..................................................................................................................................................... 44
15.3 System layout.................................................................................................................................................................. 44
15.4 Combining units and options.......................................................................................................................................... 45
15.4.1 Possible options for the indoor unit............................................................................................................... 46
16 Unit installation 47
16.1 Preparing the installation site......................................................................................................................................... 47
16.1.1 Installation site requirements of the indoor unit .......................................................................................... 47
16.1.2 Additional installation site requirements for CO₂ refrigerant ....................................................................... 50
16.2 Mounting the indoor unit ............................................................................................................................................... 54
16.2.1 Guidelines when installing the indoor unit.................................................................................................... 54
16.2.2 Guidelines when installing the drain piping................................................................................................... 57
17 Piping installation 61
17.1 Preparing refrigerant piping ........................................................................................................................................... 61
17.1.1 Refrigerant piping requirements.................................................................................................................... 61
17.1.2 Refrigerant piping insulation.......................................................................................................................... 62
17.2 Connecting the refrigerant piping .................................................................................................................................. 62
17.2.1 About connecting the refrigerant piping ....................................................................................................... 62
17.2.2 Precautions when connecting the refrigerant piping.................................................................................... 63
17.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 63
17.2.4 To connect the refrigerant piping to the indoor unit .................................................................................... 64
18 Electrical installation 66
18.1 About connecting the electrical wiring .......................................................................................................................... 66
18.1.1 Precautions when connecting the electrical wiring....................................................................................... 66
18.1.2 Guidelines when connecting the electrical wiring......................................................................................... 67
18.1.3 Specifications of standard wiring components.............................................................................................. 68
18.2 To connect the electrical wiring to the indoor unit ....................................................................................................... 69
18.3 To connect appropriate measures for appliances filled with CO₂ ................................................................................. 71
19 Commissioning 72
19.1 Overview: Commissioning .............................................................................................................................................. 72
19.2 Precautions when commissioning .................................................................................................................................. 72
19.3 Checklist before commissioning ..................................................................................................................................... 73
19.4 To perform a test run...................................................................................................................................................... 73
20 Configuration 74
20.1 Field setting..................................................................................................................................................................... 74
21 Hand-over to the user 78
22 Troubleshooting 79
22.1 Solving problems based on error codes ......................................................................................................................... 79
22.1.1 Error codes: Overview .................................................................................................................................... 79
23 Disposal 80
24 Technical data 81
24.1 Wiring diagram................................................................................................................................................................ 81
24.1.1 Unified wiring diagram legend ....................................................................................................................... 81
25 Glossary 84

1 | About the documentation
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4P677925-1 – 2021.07
1 About the documentation
1.1 About this document
INFORMATION
Make sure that the user has the printed documentation and ask him/her to keep it
for future reference.
Target audience
Authorised installers + end users
INFORMATION
This appliance is intended to be used by expert or trained users in shops, in light
industry and on farms, or for commercial use by lay persons.
WARNING
Make sure installation, servicing, maintenance, repair and applied materials follow
the instructions from Daikin and, in addition, comply with applicable legislation and
are performed by qualified persons only. In Europe and areas where IEC standards
apply, EN/IEC 60335-2-40 is the applicable standard.
Documentation set
This document is part of a documentation set. The complete set consists of:
▪General safety precautions:
-Safety instructions that you must read before installing
-Format: Paper (in the box of the indoor unit)
▪Indoor unit installation and operation manual:
-Installation and operation instructions
-Format: Paper (in the box of the indoor unit)
▪Installer and user reference guide:
-Preparation of the installation, good practices, reference data,…
-Detailed step-by-step instructions and background information for basic and
advanced usage
-Format: Digital files on http://www.daikineurope.com/support-and-manuals/
product-information/
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your dealer.
The original documentation is written in English. All other languages are
translations.
Technical engineering data
▪A subset of the latest technical data is available on the regional Daikin website
(publicly accessible).
▪The full set of latest technical data is available on the Daikin Business Portal
(authentication required).

2 | General safety precautions
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2 General safety precautions
2.1 About the documentation
▪The original documentation is written in English. All other languages are
translations.
▪The precautions described in this document cover very important topics, follow
them carefully.
▪The installation of the system, and all activities described in the installation
manual and in the installer reference guide MUST be performed by an authorised
installer.
2.1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
NOTICE
Indicates a situation that could result in equipment or property damage.
INFORMATION
Indicates useful tips or additional information.
Symbols used on the unit:

2 | General safety precautions
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4P677925-1 – 2021.07
Symbol Explanation
Before installation, read the installation and operation
manual, and the wiring instruction sheet.
Before performing maintenance and service tasks, read the
service manual.
For more information, see the installer and user reference
guide.
The unit contains rotating parts. Be careful when servicing or
inspecting the unit.
Symbols used in the documentation:
Symbol Explanation
Indicates a figure title or a reference to it.
Example: " 1–3 Figure title" means "Figure 3 in chapter 1".
Indicates a table title or a reference to it.
Example: " 1–3 Table title" means "Table 3 in chapter 1".
2.2 For the installer
2.2.1 General
If you are NOT sure how to install or operate the unit, contact your dealer.
DANGER: RISK OF BURNING/SCALDING
▪Do NOT touch the refrigerant piping, water piping or internal parts during and
immediately after operation. It could be too hot or too cold. Give it time to return
to normal temperature. If you MUST touch it, wear protective gloves.
▪Do NOT touch any accidental leaking refrigerant.
WARNING
Improper installation or attachment of equipment or accessories could result in
electrical shock, short-circuit, leaks, fire or other damage to the equipment. ONLY
use accessories, optional equipment and spare parts made or approved by Daikin.
WARNING
Make sure installation, testing and applied materials comply with applicable
legislation (on top of the instructions described in the Daikin documentation).
CAUTION
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially
children, can play with them. Possible risk: suffocation.

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WARNING
Provide adequate measures to prevent that the unit can be used as a shelter by small
animals. Small animals that make contact with electrical parts can cause
malfunctions, smoke or fire.
CAUTION
Do NOT touch the air inlet or aluminium fins of the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the unit.
▪Do NOT sit, climb or stand on the unit.
In accordance with the applicable legislation, it might be necessary to provide a
logbook with the product containing at least: information on maintenance, repair
work, results of tests, stand-by periods,…
Also, at least, following information MUST be provided at an accessible place at the
product:
▪Instructions for shutting down the system in case of an emergency
▪Name and address of fire department, police and hospital
▪Name, address and day and night telephone numbers for obtaining service
In Europe, EN378 provides the necessary guidance for this logbook.
2.2.2 Installation site
▪Provide sufficient space around the unit for servicing and air circulation.
▪Make sure the installation site withstands the weight and vibration of the unit.
▪Make sure the area is well ventilated. Do NOT block any ventilation openings.
▪Make sure the unit is level.
Do NOT install the unit in the following places:
▪In potentially explosive atmospheres.
▪In places where there is machinery that emits electromagnetic waves.
Electromagnetic waves may disturb the control system, and cause malfunction of
the equipment.
▪In places where there is a risk of fire due to the leakage of flammable gases
(example: thinner or gasoline), carbon fibre, ignitable dust.
▪In places where corrosive gas (example: sulphurous acid gas) is produced.
Corrosion of copper pipes or soldered parts may cause the refrigerant to leak.
2.2.3 Refrigerant — in case of R744
See the installation manual or installer reference guide of your application for
more information.
NOTICE
Make sure refrigerant piping installation complies with applicable legislation. In
Europe, EN378 is the applicable standard.

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NOTICE
Make sure the field piping and connections are NOT subjected to stress.
WARNING
During tests, NEVER pressurise the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).
WARNING
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,
ventilate the area immediately. Possible risks:
▪Carbon dioxide poisoning
▪Asphyxiation
NOTICE
After all the piping has been connected, make sure there is no gas leak. Use nitrogen
to perform a gas leak detection.
NOTICE
▪To avoid compressor breakdown, do NOT charge more than the specified amount
of refrigerant.
▪When the refrigerant system is to be opened, refrigerant MUST be treated
according to the applicable legislation.
WARNING
Make sure there is no oxygen in the system. Refrigerant may ONLY be charged after
performing the leak test and the vacuum drying.
Possible consequence: Self-combustion and explosion of the compressor because of
oxygen going into the operating compressor.
CAUTION
A vacuumed system will be under triple point. To avoid solid ice, ALWAYS start
charging with R744 in vapour state. When the triple point is reached (5.2 bar
absolute pressure or 4.2bar gauge pressure), you may continue charging with R744
in liquid state.
▪In case recharge is required, see the nameplate of the unit. It states the type of
refrigerant and necessary amount.
▪The unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some systems require additional charging of refrigerant.
▪Only use R744 (CO2) as refrigerant. Other substances may cause explosions and
accidents.
▪Do NOT charge liquid refrigerant directly from a gas line. Liquid compression
could cause compressor operation failure.
▪Only use tools exclusively for the refrigerant type used in the system, this to
ensure pressure resistance and prevent foreign materials from entering into the
system.
▪Open refrigerant cylinders slowly.

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CAUTION
When the refrigerant charging procedure is done or when pausing, close the valve of
the refrigerant tank immediately. If the valve is NOT closed immediately, remaining
pressure might charge additional refrigerant. Possible consequence: Incorrect
refrigerant amount.
2.2.4 Electrical
DANGER: RISK OF ELECTROCUTION
▪Turn OFF all power supply before removing the switch box cover, connecting
electrical wiring or touching electrical parts.
▪Disconnect the power supply for more than 10minutes, and measure the voltage
at the terminals of main circuit capacitors or electrical components before
servicing. The voltage MUST be less than 50VDC before you can touch electrical
components. For the location of the terminals, see the wiring diagram.
▪Do NOT touch electrical components with wet hands.
▪Do NOT leave the unit unattended when the service cover is removed.
WARNING
If NOT factory installed, a main switch or other means for disconnection, having a
contact separation in all poles providing full disconnection under overvoltage
categoryIII condition, MUST be installed in the fixed wiring.
WARNING
▪ONLY use copper wires.
▪Make sure the field wiring complies with the applicable legislation.
▪All field wiring MUST be performed in accordance with the wiring diagram
supplied with the product.
▪NEVER squeeze bundled cables and make sure they do NOT come in contact with
the piping and sharp edges. Make sure no external pressure is applied to the
terminal connections.
▪Make sure to install earth wiring. Do NOT earth the unit to a utility pipe, surge
absorber, or telephone earth. Incomplete earth may cause electrical shock.
▪Make sure to use a dedicated power circuit. NEVER use a power supply shared by
another appliance.
▪Make sure to install the required fuses or circuit breakers.
▪Make sure to install an earth leakage protector. Failure to do so may cause
electrical shock or fire.
▪When installing the earth leakage protector, make sure it is compatible with the
inverter (resistant to high frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
CAUTION
▪When connecting the power supply: connect the earth cable first, before making
the current-carrying connections.
▪When disconnecting the power supply: disconnect the current-carrying cables
first, before separating the earth connection.
▪The length of the conductors between the power supply stress relief and the
terminal block itself MUST be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply is pulled loose from
the stress relief.

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NOTICE
Precautions when laying power wiring:
▪Do NOT connect wiring of different thicknesses to the power terminal block (slack
in the power wiring may cause abnormal heat).
▪When connecting wiring which is the same thickness, do as shown in the figure
above.
▪For wiring, use the designated power wire and connect firmly, then secure to
prevent outside pressure being exerted on the terminal board.
▪Use an appropriate screwdriver for tightening the terminal screws. A screwdriver
with a small head will damage the head and make proper tightening impossible.
▪Over-tightening the terminal screws may break them.
Install power cables at least 1 meter away from televisions or radios to prevent
interference. Depending on the radio waves, a distance of 1 meter may NOT be
sufficient.
WARNING
▪After finishing the electrical work, confirm that each electrical component and
terminal inside the electrical components box is connected securely.
▪Make sure all covers are closed before starting up the unit.
NOTICE
ONLY applicable if the power supply is three‑phase, and the compressor has an ON/
OFF starting method.
If there exists the possibility of reversed phase after a momentary black out and the
power goes ON and OFF while the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed phase can break the
compressor and other parts.

3 | Specific installer safety instructions
Installer and user reference guide
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3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
CAUTION
Do NOT insert fingers, rods or other objects into the air inlet or outlet. When the fan
is rotating at high speed, it will cause injury.
General installation requirements
WARNING
Installation shall be done by an installer, the choice of materials and installation shall
comply with the applicable legislation. In Europe, EN378 is the applicable standard.
WARNING
▪Make sure to install all necessary countermeasures in case of refrigerant leakage
according to standard EN378 (see "16.1.2 Additional installation site
requirements for CO₂ refrigerant"[450]).
▪Make sure to install a CO2 leak detector (field supply) and enable the function for
refrigerant leak detection (see "20.1Field setting"[474]).
WARNING
Make sure installation, servicing, maintenance, repair and applied materials follow
the instructions from Daikin and, in addition, comply with applicable legislation and
are performed by qualified persons only. In Europe and areas where IEC standards
apply, EN/IEC 60335-2-40 is the applicable standard.
Installation site (see "16.1Preparing the installation site"[ 4
47])
CAUTION
Appliance NOT accessible to the general public, install it in a secured area, protected
from easy access.
This unit, both indoor and outdoor, is suitable for installation in a commercial and
light industrial environment.
CAUTION
Excessive concentrations of refrigerant R744 (CO2) in a closed room can lead to
unconsciousness and oxygen deficiency. Take appropriate measures.
See "To determine the minimum number of appropriate measures"[452].
WARNING
In case of mechanical ventilation, take care the ventilated air is exhausted to the
outdoor space and NOT into another closed area.
WARNING
Install the unit ONLY in locations where the doors of the occupied space are NOT
tight fitting.

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WARNING
When using safety shut-off valves, make sure to install measures such as a bypassing
piping with a pressure relief valve (from liquid pipe to gas pipe). When the safety
shut-off valves close and no measures are installed, increased pressure may damage
the liquid piping.
Refrigerant piping installation (see "17Piping installation"[ 4
61])
CAUTION
Install the refrigerant piping or components in a position where they are unlikely to
be exposed to any substance which may corrode components containing refrigerant,
unless the components are constructed of materials that are inherently resistant to
corrosion or are suitably protected against corrosion.
WARNING
▪Use K65 piping for high-pressure applications with a working pressure of 120bar
or 90bar, depending on its location in the system.
▪Use K65 unions and fittings approved for a working pressure of 120bar or 90bar,
depending on its location in the system.
▪ONLY brazing is allowed for connection of pipes. No other types of connections
are allowed.
▪Expanding of pipes is NOT allowed.
Electrical installation (see "18Electrical installation"[ 4
66])
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
▪All wiring MUST be performed by an authorised electrician and MUST comply
with the applicable legislation.
▪Make electrical connections to the fixed wiring.
▪All components procured on-site and all electrical construction MUST comply
with the applicable legislation.
WARNING
▪If the power supply has a missing or wrong N-phase, equipment might break
down.
▪Establish proper earthing. Do NOT earth the unit to a utility pipe, surge absorber,
or telephone earth. Incomplete earthing may cause electrical shock.
▪Install the required fuses or circuit breakers.
▪Secure the electrical wiring with cable ties so that the cables do NOT come into
contact with sharp edges or piping, particularly on the high-pressure side.
▪Do NOT use taped wires, stranded conductor wires, extension cords, or
connections from a star system. They can cause overheating, electrical shock or
fire.
WARNING
Use an all-pole disconnection type breaker with at least 3mm between the contact
point gaps that provide full disconnection under overvoltage category III.

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WARNING
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.
Commissioning (see "19Commissioning"[ 4
72])
WARNING
If the panels on the indoor units are not installed yet, make sure to power OFF the
system after finishing the test run. To do so, turn OFF operation via the user
interface. Do NOT stop operation by turning OFF the circuit breakers.

For the user
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For the user

4 | User safety instructions
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4 User safety instructions
Always observe the following safety instructions and regulations.
4.1 General
WARNING
If you are NOT sure how to operate the unit, contact your
installer.
WARNING
This appliance can be used by children aged from 8 years
and above and persons with reduced physical, sensory or
mental capabilities or lack of experience and knowledge if
they have been given supervision or instruction concerning
use of the appliance in a safe way and understand the
hazards involved.
Children SHALL NOT play with the appliance.
Cleaning and user maintenance SHALL NOT be made by
children without supervision.
WARNING
To prevent electrical shocks or fire:
▪Do NOT rinse the unit.
▪Do NOT operate the unit with wet hands.
▪Do NOT place any objects containing water on the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the
unit.
▪Do NOT sit, climb or stand on the unit.

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▪Units are marked with the following symbol:
This means that electrical and electronic products may NOT be mixed with
unsorted household waste. Do NOT try to dismantle the system yourself: the
dismantling of the system, treatment of the refrigerant, of oil and of other parts
MUST be done by an authorised installer and MUST comply with applicable
legislation.
Units MUST be treated at a specialised treatment facility for reuse, recycling and
recovery. By ensuring this product is disposed of correctly, you will help to
prevent potential negative consequences for the environment and human
health. For more information, contact your installer or local authority.
▪Batteries are marked with the following symbol:
This means that the batteries may NOT be mixed with unsorted household
waste. If a chemical symbol is printed beneath the symbol, this chemical symbol
means that the battery contains a heavy metal above a certain concentration.
Possible chemical symbols are: Pb: lead (>0.004%).
Waste batteries MUST be treated at a specialised treatment facility for reuse. By
ensuring waste batteries are disposed of correctly, you will help to prevent
potential negative consequences for the environment and human health.
4.2 Instructions for safe operation
WARNING
Do NOT modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation
may cause an electrical shock or fire. Contact your dealer.
CAUTION
If this unit is equipped with an electrically powered safety
measure, such as a CO2 refrigerant leak detector (field
supply), in order to be effective, the unit must be
electrically powered at all times after installation, except
for short service periods.
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet or outlet. When the fan is rotating at high speed, it
will cause injury.

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CAUTION
▪NEVER touch the internal parts of the controller.
▪Do NOT remove the front panel. Some parts inside are
dangerous to touch and appliance problems may
happen. For checking and adjusting the internal parts,
contact your dealer.
WARNING
This unit contains electrical and hot parts.
WARNING
Before operating the unit, be sure the installation has been
carried out correctly by an installer.
CAUTION
It is unhealthy to expose your body to the air flow for a
long time.
CAUTION
To avoid oxygen deficiency, ventilate the room sufficiently
if equipment with burner is used together with the system.
CAUTION
Do NOT operate the system when using a room
fumigation-type insecticide. Chemicals could collect in the
unit, and endanger the health of people who are
hypersensitive to chemicals.
CAUTION
NEVER expose little children, plants or animals directly to
the airflow.
WARNING
Do NOT place objects below the indoor and/or outdoor
unit that may get wet. Otherwise condensation on the
main unit or refrigerant pipes, air filter dirt or drain
blockage may cause dripping, and objects under the unit
may get dirty or damaged.

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WARNING
Do NOT place a flammable spray bottle near the air
conditioner and do NOT use sprays near the unit. Doing so
may result in a fire.
Maintenance and service (see "10Maintenance and service"[ 4
29])
WARNING: System contains refrigerant under
very high pressure.
The system MUST be serviced by qualified persons ONLY.
CAUTION: Pay attention to the fan!
It is dangerous to inspect the unit while the fan is running.
Make sure to turn OFF the main switch before executing
any maintenance task.
WARNING
NEVER replace a fuse with a fuse of a wrong ampere
ratings 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.
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
CAUTION
Before accessing terminal devices, make sure to interrupt
all power supply.
DANGER: RISK OF ELECTROCUTION
To clean the air conditioner or air filter, be sure to stop
operation and turn all power supplies OFF. Otherwise, an
electrical shock and injury may result.
WARNING
Be careful with ladders when working in high places.
WARNING
Do NOT let the indoor unit get wet. Possible consequence:
Electrical shock or fire.

4 | User safety instructions
Installer and user reference guide
19
FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 – 2021.07
About the refrigerant (see "10.5About the refrigerant"[ 4
33])
WARNING
▪Do NOT pierce or burn refrigerant cycle parts.
▪Be aware that the refrigerant inside the system is
odourless.
WARNING
The R744 refrigerant (CO2) inside the unit is odourless,
non-flammable and normally does NOT leak.
ALWAYS install a CO2 detector according to the
specifications of standard EN378.
If the refrigerant leaks in high concentrations in the room,
it may have negative effects on its occupants such as
asphyxiation and carbon dioxide poisoning. Ventilate the
room and contact the dealer where you purchased the
unit (see "10.5.1 About refrigerant leak
detection"[434]).
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
Troubleshooting (see "11Troubleshooting"[ 4
35])
WARNING
Stop operation and shut OFF the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electrical shock or fire. Contact your
dealer.

5 | About the system
Installer and user reference guide
20
FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 – 2021.07
5 About the system
NOTICE
The appliance shall be stored so as to prevent mechanical damage.
WARNING
Do NOT modify, disassemble, remove, reinstall or repair the unit yourself as incorrect
dismantling or installation may cause an electrical shock or fire. Contact your dealer.
NOTICE
Do NOT use the system 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.
NOTICE
For future modifications or expansions of your system:
A full overview of allowable combinations (for future system extensions) is available
in technical engineering data and should be consulted. Contact your installer to
receive more information and professional advice.
CAUTION
If this unit is equipped with an electrically powered safety measure, such as a CO2
refrigerant leak detector (field supply), in order to be effective, the unit must be
electrically powered at all times after installation, except for short service periods.
5.1 System layout
INFORMATION
The following illustration is an example and might NOT match your system layout.