Daikin FDA125A5VEB User manual

Installer and user reference guide
Split system air conditioners
FDA125A5VEB

Table of Contents
Installer and user reference guide
2
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
Table of Contents
1 About the documentation 4
1.1 About this document ...................................................................................................................................................... 4
1.2 Meaning of warnings and symbols................................................................................................................................. 5
2 General safety precautions 7
2.1 For the installer............................................................................................................................................................... 7
2.1.1 General ........................................................................................................................................................... 7
2.1.2 Installation site ............................................................................................................................................... 8
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 11
2.1.4 Electrical ......................................................................................................................................................... 13
3 Specific installer safety instructions 16
For the user 19
4 User safety instructions 20
4.1 General............................................................................................................................................................................ 20
4.2 Instructions for safe operation ....................................................................................................................................... 21
5 About the system 26
5.1 System layout.................................................................................................................................................................. 26
5.2 Information requirements for fan coil units................................................................................................................... 27
6 User interface 28
7 Before operation 29
8 Operation 30
8.1 Operation range.............................................................................................................................................................. 30
8.2 About operation modes.................................................................................................................................................. 30
8.2.1 Basic operation modes................................................................................................................................... 31
8.2.2 Special heating operation modes................................................................................................................... 31
8.3 To operate the system.................................................................................................................................................... 31
9 Energy saving and optimum operation 32
10 Maintenance and service 33
10.1 Precautions for maintenance and service...................................................................................................................... 33
10.2 Cleaning the air filter and air outlet ............................................................................................................................... 33
10.2.1 To clean the air filter ...................................................................................................................................... 33
10.2.2 To clean the air outlet .................................................................................................................................... 34
10.3 Maintenance before a long stop period......................................................................................................................... 34
10.4 Maintenance after a long stop period............................................................................................................................ 35
10.5 About the refrigerant...................................................................................................................................................... 35
11 Troubleshooting 37
11.1 Symptoms that are NOT system malfunctions............................................................................................................... 38
11.1.1 Symptom: The system does not operate....................................................................................................... 38
11.1.2 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 39
11.1.3 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 39
11.1.4 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 39
11.1.5 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 39
11.1.6 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 40
11.1.7 Symptom: Dust comes out of the unit........................................................................................................... 40
11.1.8 Symptom: The units can give off odours ....................................................................................................... 40
12 Relocation 41
13 Disposal 42
For the installer 43
14 About the box 44
14.1 Indoor unit ...................................................................................................................................................................... 44
14.1.1 To unpack and handle the unit ...................................................................................................................... 44
14.1.2 To remove the accessories from the indoor unit .......................................................................................... 45

Table of Contents
Installer and user reference guide
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FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
15 About the units and options 46
15.1 Identification ................................................................................................................................................................... 46
15.1.1 Identification label: Indoor unit ..................................................................................................................... 46
15.2 About the indoor unit ..................................................................................................................................................... 46
15.3 System layout.................................................................................................................................................................. 47
15.4 Combining units and options.......................................................................................................................................... 47
15.4.1 Possible options for the indoor unit............................................................................................................... 48
16 Unit installation 49
16.1 Preparing the installation site......................................................................................................................................... 49
16.1.1 Installation site requirements of the indoor unit .......................................................................................... 49
16.2 Mounting the indoor unit ............................................................................................................................................... 51
16.2.1 Guidelines when installing the indoor unit.................................................................................................... 51
16.2.2 Guidelines when installing the ducting.......................................................................................................... 54
16.2.3 Guidelines when installing the drain piping................................................................................................... 55
17 Piping installation 59
17.1 Preparing refrigerant piping ........................................................................................................................................... 59
17.1.1 Refrigerant piping requirements.................................................................................................................... 59
17.1.2 Refrigerant piping insulation.......................................................................................................................... 60
17.2 Connecting the refrigerant piping .................................................................................................................................. 60
17.2.1 About connecting the refrigerant piping ....................................................................................................... 60
17.2.2 Precautions when connecting the refrigerant piping.................................................................................... 60
17.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 61
17.2.4 Pipe bending guidelines ................................................................................................................................. 62
17.2.5 To flare the pipe end ...................................................................................................................................... 62
17.2.6 To connect the refrigerant piping to the indoor unit .................................................................................... 63
18 Electrical installation 64
18.1 About connecting the electrical wiring .......................................................................................................................... 64
18.1.1 Precautions when connecting the electrical wiring....................................................................................... 64
18.1.2 Guidelines when connecting the electrical wiring......................................................................................... 65
18.1.3 Specifications of standard wiring components.............................................................................................. 67
18.2 To connect the electrical wiring to the indoor unit ....................................................................................................... 67
19 Commissioning 71
19.1 Overview: Commissioning .............................................................................................................................................. 71
19.2 Precautions when commissioning .................................................................................................................................. 71
19.3 Checklist before commissioning ..................................................................................................................................... 71
19.4 To perform a test run...................................................................................................................................................... 72
20 Configuration 73
20.1 Field setting..................................................................................................................................................................... 73
21 Hand-over to the user 75
22 Troubleshooting 76
22.1 Solving problems based on error codes ......................................................................................................................... 76
22.1.1 Error codes: Overview .................................................................................................................................... 76
23 Disposal 77
24 Technical data 78
24.1 Wiring diagram................................................................................................................................................................ 78
24.1.1 Unified wiring diagram legend ....................................................................................................................... 78
25 Glossary 81

1 | About the documentation
Installer and user reference guide
4
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
1 About the documentation
1.1 About this document
WARNING
Make sure installation, servicing, maintenance, repair and applied materials follow
the instructions from Daikin (including all documents listed in “Documentation set”)
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.
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 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 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 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.
Scan the QR code below to find the full documentation set and more information
about your product on Daikin website.
The original documentation is written in English. All other languages are
translations.

1 | About the documentation
Installer and user reference guide
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FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
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).
1.2 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:
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.

1 | About the documentation
Installer and user reference guide
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FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
Symbol Explanation
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 | General safety precautions
Installer and user reference guide
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FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
2 General safety precautions
2.1 For the installer
2.1.1 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).
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.
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:

2 | General safety precautions
Installer and user reference guide
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4P495031-1B – 2022.10
▪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.
2.1.2 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.
Instructions for equipment using R32 refrigerant
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 and are executed ONLY by authorised
persons.

2 | General safety precautions
Installer and user reference guide
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Split system air conditioners
4P495031-1B – 2022.10
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
▪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 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 installation between parts of refrigerant system shall be accessible
for maintenance purposes.
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)

2 | General safety precautions
Installer and user reference guide
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Split system air conditioners
4P495031-1B – 2022.10
NOTICE
▪Protect pipework 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
3Use the graph or table to determine the minimum floor area.

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0
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1.843 9.55
2.21.8
2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6 6.4 6.8 7.2 7.6 8 8.4 8.8 9.22
2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8 6.2 6.6 7 7.4 7.8 8.2 8.6 9 9.4
Floor-standing unit
(c)
Wall-mounted unit
(b)
Ceiling-mounted unit
(a)
m [kg]
Amin [m2]
Ceiling-mounted
unit(a)
4.6 13.4 4.6 180
4.8 14.6 4.8 196
5.0 15.8 5.0 213
≤1.842 —
5.2 17.1
≤1.842 —
5.2 230
1.843 3.64
5.4 18.5
1.843 28.9
5.4 248
2.0 3.95
5.6 19.9
2.0 34.0
5.6 267
2.2 4.34
5.8 21.3
2.2 41.2
5.8 286
2.4 4.74
6.0 22.8
2.4 49.0
6.0 306
2.6 5.13
6.2 24.3
2.6 57.5
6.2 327
2.8 5.53
6.4 25.9
2.8 66.7
6.4 349
3.0 5.92
6.6 27.6
3.0 76.6
6.6 371
3.2 6.48
6.8 29.3
3.2 87.2
6.8 394
3.4 7.32
7.0 31.0
3.4 98.4
7.0 417
3.6 8.20
7.2 32.8
3.6 110
7.2 441
3.8 9.14
7.4 34.7
3.8 123
7.4 466
4.0 10.1
7.6 36.6
4.0 136
7.6 492
4.2 11.2
7.8 38.5
4.2 150
7.8 518
4.4 12.3 4.4 165
m (kg) Amin (m2)
4.6 20.0
4.8 21.8
5.0 23.6
≤1.842 —
5.2 25.6
1.843 4.45
5.4 27.6
2.0 4.83
5.6 29.7
2.2 5.31
5.8 31.8
2.4 5.79
6.0 34.0
2.6 6.39
6.2 36.4
2.8 7.41
6.4 38.7
3.0 8.51
6.6 41.2
3.2 9.68
6.8 43.7
3.4 10.9
7.0 46.3
3.6 12.3
7.2 49.0
3.8 13.7
7.4 51.8
4.0 15.1
7.6 54.6
4.2 16.7
7.8 57.5
4.4 18.3
8 40.5
8.2 42.6
8.4 44.7
8.6 46.8
8.8 49.0
9 51.3
9.2 53.6
9.4 55.9
9.55 57.7
8 60.5
8.2 63.6
8.4 66.7
8.6 69.9
8.8 73.2
9 76.6
9.2 80.0
9.4 83.6
9.55 86.2
8 545
8.2 572
8.4 601
8.6 629
8.8 659
9 689
9.2 720
9.4 752
9.55 776
Wall-mounted
unit(b)
m (kg) Amin (m2)
Floor-standing
unit(c)
m (kg) Amin (m2)
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)
2.1.3 Refrigerant — in case of R410A or R32
If applicable. See the installation manual or installer reference guide of your
application for more information.
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).

2 | General safety precautions
Installer and user reference guide
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FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
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 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 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.

2 | General safety precautions
Installer and user reference guide
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Split system air conditioners
4P495031-1B – 2022.10
If Then
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.
2.1.4 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.

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Installer and user reference guide
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Split system air conditioners
4P495031-1B – 2022.10
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.
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.
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.

2 | General safety precautions
Installer and user reference guide
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Split system air conditioners
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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.
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
16
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
General
WARNING
Make sure installation, servicing, maintenance, repair and applied materials follow
the instructions from Daikin (including all documents listed in “Documentation set”)
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.
Unit installation (see "16Unit installation"[ 4
49])
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
The appliance using R32 refrigerant shall be stored so as to prevent mechanical
damage and in a well-ventilated room without continuously operating ignition
sources (e.g. open flames, an operating gas appliance, or an operating electric
heater). The room size shall be as specified in the General safety precaution.
CAUTION
Appliance NOT accessible to the general public. Install it in a secured area, protected
from easy access.
This unit is suitable for installation in a commercial, light industrial, household and
residential environment.
WARNING
For units using the R32 refrigerant it is necessary to keep any required ventilation
openings clear of obstructions.
Duct installation (see "16.2.2Guidelines when installing the ducting"[ 4
54])
WARNING
Do NOT install operating ignition sources (example: open flames, an operating gas
appliance or an operating electric heater) in the duct work.

3 | Specific installer safety instructions
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CAUTION
▪Make sure the installation of the duct does NOT exceed the setting range of the
external static pressure for the unit. Refer to the technical datasheet of your
model for the setting range.
▪Make sure to install the canvas duct so vibrations are NOT transmitted to the
duct or ceiling. Use a sound-absorbing material (insulation material) for the lining
of the duct and apply vibration insulation rubber to the hanging bolts.
▪When welding, make sure NOT to spatter onto the drain pan or the air filter.
▪If the metal duct passes through a metal lath, wire lath or metal plate of the
wooden structure, separate the duct and wall electrically.
▪Install the outlet grille in a position where the airflow will not come into direct
contact with people.
▪Do NOT use booster fans in the duct. Use the function to adjust the fan rate
setting automatically (see "20Configuration"[473]).
Refrigerant piping installation (see "17Piping installation"[ 4
59])
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
Piping MUST be installed according to instructions given in "17 Piping
installation" [4 59]. Only mechanical joints (e.g. braze+flare connections) that are
compliant with the latest version of ISO14903 can be used.
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.
Electrical installation (see "18Electrical installation"[ 4
64])
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 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.

3 | Specific installer safety instructions
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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 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 shock 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
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.

For the user
Installer and user reference guide
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For the user

4 | User safety instructions
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20
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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.