Daikin FTXP25N5V1B9 How to use

Installer reference guide
Split system air conditioners
FTXP20N5V1B9
FTXP25N5V1B9
FTXP35N5V1B9
ATXP20N5V1B9
ATXP25N5V1B9
ATXP35N5V1B9

Table of contents
Installer reference guide
2
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
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 R410A or R32.......................................................................................................... 9
2.2.4 Brine................................................................................................................................................................ 11
2.2.5 Water .............................................................................................................................................................. 12
2.2.6 Electrical ......................................................................................................................................................... 12
3 Specific installer safety instructions 14
4 About the box 19
4.1 Overview: About the box ................................................................................................................................................ 19
4.2 Indoor unit ...................................................................................................................................................................... 19
4.2.1 To unpack the indoor unit.............................................................................................................................. 20
4.2.2 To remove the accessories from the indoor unit .......................................................................................... 20
5 About the unit 21
5.1 System layout.................................................................................................................................................................. 21
5.2 Operation range.............................................................................................................................................................. 21
5.3 About the wireless LAN................................................................................................................................................... 22
5.3.1 Precautions when using the wireless LAN ..................................................................................................... 22
5.3.2 Basic parameters ............................................................................................................................................ 22
5.3.3 Setting the wireless LAN................................................................................................................................. 22
6 Unit installation 24
6.1 Preparing the installation site......................................................................................................................................... 24
6.1.1 Installation site requirements of the indoor unit .......................................................................................... 24
6.2 Opening the indoor unit ................................................................................................................................................. 26
6.2.1 To remove the front panel ............................................................................................................................. 26
6.2.2 To re-install the front panel ........................................................................................................................... 26
6.2.3 To remove the front grille .............................................................................................................................. 26
6.2.4 To re-install the front grille ............................................................................................................................ 27
6.2.5 To remove the electrical wiring box cover..................................................................................................... 27
6.2.6 To open the service cover .............................................................................................................................. 27
6.3 Installing the indoor unit ................................................................................................................................................ 28
6.3.1 Precautions when installing the indoor unit.................................................................................................. 28
6.3.2 To install the mounting plate ......................................................................................................................... 28
6.3.3 To drill a wall hole........................................................................................................................................... 29
6.3.4 To remove the pipe port cover ...................................................................................................................... 29
6.3.5 To provide drainage........................................................................................................................................ 30
7 Piping installation 33
7.1 Preparing refrigerant piping ........................................................................................................................................... 33
7.1.1 Refrigerant piping requirements.................................................................................................................... 33
7.1.2 Refrigerant piping insulation.......................................................................................................................... 34
7.2 Connecting the refrigerant piping .................................................................................................................................. 34
7.2.1 About connecting the refrigerant piping ....................................................................................................... 34
7.2.2 Precautions when connecting the refrigerant piping.................................................................................... 34
7.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 35
7.2.4 Pipe bending guidelines ................................................................................................................................. 36
7.2.5 To flare the pipe end ...................................................................................................................................... 36
7.2.6 To connect the refrigerant piping to the indoor unit .................................................................................... 37
8 Electrical installation 38
8.1 Preparing electrical wiring .............................................................................................................................................. 38
8.1.1 About preparing electrical wiring................................................................................................................... 38
8.2 Connecting the electrical wiring..................................................................................................................................... 38
8.2.1 About connecting the electrical wiring.......................................................................................................... 38
8.2.2 Precautions when connecting the electrical wiring....................................................................................... 39
8.2.3 Guidelines when connecting the electrical wiring......................................................................................... 39
8.2.4 Specifications of standard wiring components.............................................................................................. 41

Table of contents
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
8.2.5 To connect the electrical wiring to the indoor unit....................................................................................... 41
8.2.6 To connect to an HA system (Wired remote controller, Central remote controller, wireles adaptor,
etc.) ................................................................................................................................................................. 42
9 Finishing the indoor unit installation 44
9.1 To insulate the drain piping, refrigerant piping and interconnection cable.................................................................. 44
9.2 To pass the pipes through the wall hole ........................................................................................................................ 44
9.3 To fix the unit on the mounting plate ............................................................................................................................ 45
10 Configuration 46
10.1 To set a different channel of the indoor unit infrared signal receiver .......................................................................... 46
11 Commissioning 48
11.1 Overview: Commissioning .............................................................................................................................................. 48
11.2 Checklist before commissioning ..................................................................................................................................... 48
11.3 To perform a test run...................................................................................................................................................... 49
11.3.1 To perform a test run in winter season ......................................................................................................... 49
12 Hand-over to the user 50
13 Disposal 51
14 Technical data 52
14.1 Wiring diagram................................................................................................................................................................ 52
14.1.1 Unified wiring diagram legend ....................................................................................................................... 52
15 Glossary 55

1 | About the documentation
Installer reference guide
4
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
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
INFORMATION
This appliance is intended to be used by expert or trained users in shops, in light
industry, and on farms, or for commercial and household use by lay persons.
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 manual:
-Installation instructions
-Format: Paper (in the box of the indoor unit)
▪Installer reference guide:
-Preparation of the installation, good practices, reference data,…
-Format: Digital files on https://www.daikin.eu. Use the search function to
find your model.
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your dealer.
The original instructions are written in English. All other languages are translations
of the original instructions.
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
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
2 General safety precautions
2.1 About the documentation
▪The original instructions are written in English. All other languages are
translations of the original instructions.
▪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
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
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.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
Symbols used on the unit:
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
unless otherwise specified.
WARNING
Make sure installation, testing and applied materials comply with applicable
legislation (on top of the instructions described in the Daikin documentation).
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
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
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
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.
▪In bathrooms.
Instructions for equipment using R32 refrigerant
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
WARNING
▪Do NOT pierce or burn refrigerant cycle parts.
▪Do NOT use cleaning materials or means to accelerate the defrosting process
other than those recommended by the manufacturer.
▪Be aware that the refrigerant inside the system is odourless.
WARNING
The appliance shall be stored so as to prevent mechanical damage and in a well-
ventilated room without continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric heater) and have a room
size as specified below.
WARNING
Make sure installation, servicing, maintenance and repair comply with instructions
from Daikin and with applicable legislation (for example national gas regulation) and
are executed ONLY by authorised persons.
WARNING
If one or more rooms are connected to the unit using a duct system, make sure:
▪there are no operating ignition sources (example: open flames, an operating gas
appliance or an operating electric heater) in case the floor area is less than the
minimum floor area A (m²).
▪no auxiliary devices, which may be a potential ignition source, are installed in the
duct work (example: hot surfaces with a temperature exceeding 700°C and
electric switching device);
▪only auxiliary devices approved by the manufacturer are used in the duct work;
▪air inlet AND outlet are connected directly to the same room by ducting. Do NOT
use spaces such as a false ceiling as a duct for the air inlet or outlet.
WARNING
▪Take precautions to avoid excessive vibration or pulsation to refrigeration piping.
▪Protect the protection devices, piping and fittings as much as possible against
adverse environmental effects.
▪Provide space for expansion and contraction of long runs of piping.
▪Design and install piping in refrigerating systems such as to minimise the
likelihood of hydraulic shock damaging the system.
▪Mount the indoor equipment and pipes securely and protect them to avoid
accidental rupture of equipment or pipes in case of events such as moving
furniture or reconstruction activities.
CAUTION
Do NOT use potential sources of ignition in searching for or detection of refrigerant
leaks.
NOTICE
▪Do NOT re-use joints and copper gaskets which have been used already.
▪Joints made in the installation between parts of the refrigerant system shall be
accessible for maintenance purposes.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
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4P751614-1 – 2023.08
Installation space requirements
WARNING
If appliances contain R32 refrigerant, the floor area of the room in which the
appliances are installed, operated and stored MUST be larger than the minimum
floor area defined in table below A (m2). This applies to:
▪Indoor units without a refrigerant leakage sensor; in case of indoor units with
refrigerant leakage sensor, consult the installation manual
▪Outdoor units installed or stored indoors (e.g. winter garden, garage, machinery
room)
NOTICE
▪The pipework shall be securely mounted and guarded protected from physical
damage.
▪Keep the pipework installation to a minimum.
To determine the minimum floor area
1Determine the total refrigerant charge in the system (= factory refrigerant
charge + additional refrigerant amount charged).
Contains fluorinated greenhouse gases
2
11
1
2
2kg
tCO
2
eq
1000
GWP × kg
=
=
+
kg
=
kg
=
GWP: xxx
R32
2Determine which graph or table to use.
▪For indoor units: Is the unit ceiling-mounted, wall-mounted or floor-
standing?
▪For outdoor units installed or stored indoors, this depends on the installation
height:
If the installation height is… Then use the graph or table for…
<1.8m Floor-standing units
1.8≤x<2.2m Wall-mounted units
≥2.2m Ceiling-mounted units
mTotal refrigerant charge in the system
Amin Minimum floor area
(a) Ceiling-mounted unit (= Ceiling-mounted unit)
(b) Wall-mounted unit (= Wall-mounted unit)
(c) Floor-standing unit (= Floor-standing unit)
2.2.3 Refrigerant — in case of R410A or R32
If applicable. See the installation manual or installer reference guide of your
application for more information.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
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4P751614-1 – 2023.08
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump down the system, and there
is a leak in the refrigerant circuit:
▪Do NOT use the unit's automatic pump down function, with which you can collect
all refrigerant from the system into the outdoor unit. Possible consequence: Self-
combustion and explosion of the compressor because of air going into the
operating compressor.
▪Use a separate recovery system so that the unit's compressor does NOT have to
operate.
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:
▪Excessive refrigerant concentrations in a closed room can lead to oxygen
deficiency.
▪Toxic gas might be produced if refrigerant gas comes into contact with fire.
WARNING
ALWAYS recover the refrigerant. Do NOT release them directly into the environment.
Use a vacuum pump to evacuate the installation.
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.
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.
NOTICE
Make sure refrigerant piping installation complies with applicable legislation. In
Europe, EN378 is the applicable standard.
NOTICE
Make sure the field piping and connections are NOT subjected to stress.
NOTICE
After all the piping has been connected, make sure there is no gas leak. Use nitrogen
to perform a gas leak detection.
▪In case recharge is required, see the nameplate or the refrigerant charge label of
the unit. It states the type of refrigerant and necessary amount.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
▪Whether the unit is factory charged with refrigerant or non-charged, in both
cases you might need to charge additional refrigerant, depending on the pipe
sizes and pipe lengths of the system.
▪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.
▪Charge the liquid refrigerant as follows:
If Then
A siphon tube is present
(i.e., the cylinder is marked with "Liquid
filling siphon attached")
Charge with the cylinder upright.
A siphon tube is NOT present Charge with the cylinder upside down.
▪Open refrigerant cylinders slowly.
▪Charge the refrigerant in liquid form. Adding it in gas form may prevent normal
operation.
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 Brine
If applicable. See the installation manual or installer reference guide of your
application for more information.
WARNING
The selection of the brine MUST be in accordance with the applicable legislation.
WARNING
Take sufficient precautions in case of brine leakage. If brine leaks, ventilate the area
immediately and contact your local dealer.
WARNING
The ambient temperature inside the unit can get much higher than that of the room,
e.g. 70°C. In case of a brine leak, hot parts inside the unit can create a hazardous
situation.
WARNING
The use and installation of the application MUST comply with the safety and
environmental precautions specified in the applicable legislation.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
2.2.5 Water
If applicable. See the installation manual or installer reference guide of your
application for more information.
NOTICE
Make sure water quality complies with EU directive 2020/2184.
2.2.6 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.

2 | General safety precautions
Installer reference guide
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FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
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.
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.
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 reference guide
14
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
Unit installation (see "6Unit installation"[ 4
24])
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.
Installation site (see "6.1Preparing the installation site"[ 4
24])
CAUTION
▪Check if the installation location can support the unit's weight. Poor installation is
hazardous. It can also cause vibrations or unusual operating noise.
▪Provide sufficient service space.
▪Do NOT install the unit so that it is in contact with a ceiling or a wall, as this may
cause vibrations.
WARNING
The appliance shall be stored in a room without continuously operating ignition
sources (example: open flames, an operating gas appliance or an operating electric
heater).
Connecting the refrigerant piping (see "7.2Connecting the refrigerant
piping"[
4
34])
CAUTION
▪No brazing or welding on site for units with R32 refrigerant charge during
shipment.
▪During installation of the refrigeration system, joining of parts with at least one
part charged shall be performed taking into account the following requirements:
inside occupied spaces non-permanent joints are NOT allowed for R32 refrigerant
except for site made joints directly connecting the indoor unit to piping. Site
made joints directly connecting piping to indoor units shall be of non-permanent
type.
NOTICE
▪Use the flare nut fixed to the unit.
▪To prevent gas leakage, apply refrigeration oil ONLY to the inside of the flare. Use
refrigeration oil for R32 (FW68DA).
▪Do NOT reuse joints.
NOTICE
▪Do NOT use mineral oil on flared part.
▪Do NOT reuse piping from previous installations.
▪NEVER install a drier to this R32 unit to guarantee its lifetime. The drying material
may dissolve and damage the system.

3 | Specific installer safety instructions
Installer reference guide
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Split system air conditioners
4P751614-1 – 2023.08
WARNING
Connect the refrigerant piping securely before running the compressor. If the
refrigerant piping is NOT connected and the stop valve is open when the compressor
is run, air will be sucked in. This will cause abnormal pressure in the refrigeration
cycle, which may result in equipment damage and even injury.
CAUTION
▪Incomplete flaring may cause refrigerant gas leakage.
▪Do NOT re-use flares. Use new flares to prevent refrigerant gas leakage.
▪Use flare nuts that are included with the unit. Using different flare nuts may
cause refrigerant gas leakage.
CAUTION
Do NOT open the valves before flaring is complete. This would cause refrigerant gas
leakage.
DANGER: RISK OF EXPLOSION
Do NOT open the stop valves before the vacuum drying is finished.
Charging refrigerant (see Charging refrigerant)
WARNING
▪The refrigerant inside the unit is mildly flammable, but normally does NOT leak. If
the refrigerant leaks in the room and comes in contact with fire from a burner, a
heater, or a cooker, this may result in fire, or the formation of 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 unit until a service person confirms that the part from which the
refrigerant leaked has been repaired.
WARNING
▪Only use R32 as refrigerant. Other substances may cause explosions and
accidents.
▪R32 contains fluorinated greenhouse gases. Its global warming potential (GWP)
value is 675. Do NOT vent these gases into the atmosphere.
▪When charging refrigerant, ALWAYS use protective gloves and safety glasses.
NOTICE
To avoid compressor breakdown, do NOT charge more than the specified amount of
refrigerant.
WARNING
NEVER directly touch any accidental leaking refrigerant. This could result in severe
wounds caused by frostbite.
Electrical installation (see "8Electrical installation"[ 4
38])
WARNING
The appliance MUST be installed in accordance with national wiring regulations.

3 | Specific installer safety instructions
Installer reference guide
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4P751614-1 – 2023.08
WARNING
▪All wiring MUST be performed by an authorised electrician and MUST comply
with the national wiring regulation.
▪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 shocks.
▪Install the required fuses or circuit breakers.
▪Secure the electrical wiring with cable ties so that the cables do NOT come in
contact with sharp edges or piping, particularly on the high-pressure side.
▪Do NOT use taped wires, extension cords, or connections from a star system.
They can cause overheating, electrical shocks or fire.
▪Do NOT install a phase advancing capacitor, because this unit is equipped with an
inverter. A phase advancing capacitor will reduce performance and may cause
accidents.
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least 3mm between the contact
point gaps that provides full disconnection under overvoltage category III.
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.
WARNING
Do NOT connect the power supply to the indoor unit. This could result in electrical
shock or fire.
WARNING
▪Do NOT use locally purchased electrical parts inside the product.
▪Do NOT branch the power supply for the drain pump, etc. from the terminal
block. This could result in electrical shock or fire.
WARNING
Keep the interconnection wiring away from copper pipes without thermal insulation
as such pipes will be very hot.
DANGER: RISK OF ELECTROCUTION
All electrical parts (including thermistors) are powered by the power supply. Do NOT
touch them with bare hands.

3 | Specific installer safety instructions
Installer reference guide
17
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
DANGER: RISK OF ELECTROCUTION
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.
Finishing indoor unit installation (see Finishing the outdoor unit installation)
DANGER: RISK OF ELECTROCUTION
▪Make sure that the system is earthed properly.
▪Turn OFF the power supply before servicing.
▪Install the switch box cover before turning ON the power supply.
Commissioning (see "11Commissioning"[ 4
48])
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
CAUTION
Do NOT perform the test operation while working on the indoor units.
When performing the test operation, NOT ONLY the outdoor unit, but the connected
indoor unit will operate as well. Working on an indoor unit while performing a test
operation is dangerous.
CAUTION
Do NOT insert fingers, rods or other objects into the air inlet or outlet. Do NOT
remove the fan guard. When the fan is rotating at high speed, it will cause injury.
Troubleshooting (see Troubleshooting)
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
WARNING
▪When carrying out an inspection on the switch box of the unit, ALWAYS make
sure that the unit is disconnected from the mains. Turn off the respective circuit
breaker.
▪When a safety device was activated, stop the unit and find out why the safety
device was activated before resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default setting. If you are unable to
find the cause of the problem, call your dealer.

3 | Specific installer safety instructions
Installer reference guide
18
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
WARNING
Prevent hazards due to inadvertent resetting of the thermal cut-out: power to this
appliance MUST NOT be supplied through an external switching device, such as a
timer, or connected to a circuit that is regularly turned ON and OFF by the utility.
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.

4 | About the box
Installer reference guide
19
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
4 About the box
Keep the following in mind:
▪At delivery, the unit MUST be checked for damage and completeness. Any
damage or missing parts MUST be reported immediately to the claims agent of
the carrier.
▪Bring the packed unit as close as possible to its final installation position to
prevent damage during transport.
▪Prepare in advance the path along which you want to bring the unit to its final
installation position.
▪When handling the unit, take into account the following:
Fragile, handle the unit with care.
Keep the unit upright in order to avoid damage.
4.1 Overview: About the box
This chapter describes what you have to do after the box with the indoor unit is
delivered on-site.
It contains information about:
▪Unpacking and handling the unit
▪Removing the accessories from the unit
Keep the following in mind:
▪At delivery, the unit MUST be checked for damage and completeness. Any
damage or missing parts MUST be reported immediately to the claims agent of
the carrier.
▪Bring the packed unit as close as possible to its final installation position to
prevent damage during transport.
▪When handling the unit, take into account the following:
Fragile, handle the unit with care.
Keep the unit upright in order to avoid damage.
▪Prepare in advance the path along which you want to bring the unit to its final
installation position.
4.2 Indoor unit
INFORMATION
The following figures are just examples and may NOT completely match your system
layout.

4 | About the box
Installer reference guide
20
FTXP20~35N5V1B9 + ATXP20~35N5V1B9
Split system air conditioners
4P751614-1 – 2023.08
4.2.1 To unpack the indoor unit
4.2.2 To remove the accessories from the indoor unit
1
3
2
2
1Remove:
▪the accessory bag located at the bottom of the package,
▪the mounting plate attached to the back of the indoor unit.
2× 2× 2×1× 1× 1×1× 1× 1×
edba c f g h i
aInstallation manual
bOperation manual
cGeneral safety precautions
dTitanium apatite deodorising and silver particle filter
eIndoor unit fixing screw (M4×12L). Refer to "9.3To fix the unit on the mounting
plate"[445].
fDry battery AAA.LR03 (alkaline) for user interface
gUser interface holder
hUser interface
iMounting plate