Daikin Multi+ R32 Split Series How to use

Installer reference guide
R32 Split series
4MWXM52A2V1B9

Table of contents
Installer reference guide
2
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
Table of contents
1 About the documentation 4
1.1 About this document ...................................................................................................................................................... 4
1.1.1 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 ......................................................................................................................................................... 12
3 Specific installer safety instructions 15
4 About the box 20
4.1 Outdoor unit ................................................................................................................................................................... 20
4.1.1 To unpack the outdoor unit ........................................................................................................................... 20
4.1.2 To handle the outdoor unit............................................................................................................................ 20
4.1.3 To remove the accessories from the outdoor unit........................................................................................ 21
5 About the unit 22
5.1 Identification ................................................................................................................................................................... 22
5.1.1 Identification label: Outdoor unit .................................................................................................................. 22
6 Unit installation 23
6.1 Preparing the installation site......................................................................................................................................... 23
6.1.1 Installation site requirements of the outdoor unit........................................................................................ 24
6.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 26
6.2 Opening the unit ............................................................................................................................................................. 27
6.2.1 About opening the unit .................................................................................................................................. 27
6.2.2 To open the outdoor unit............................................................................................................................... 27
6.3 Mounting the outdoor unit............................................................................................................................................. 28
6.3.1 About mounting the outdoor unit ................................................................................................................. 28
6.3.2 Precautions when mounting the outdoor unit.............................................................................................. 28
6.3.3 To provide the installation structure ............................................................................................................. 28
6.3.4 To install the outdoor unit ............................................................................................................................. 29
6.3.5 To provide drainage........................................................................................................................................ 29
6.3.6 To prevent the outdoor unit from falling over .............................................................................................. 30
7 Piping installation 32
7.1 Preparing refrigerant piping ........................................................................................................................................... 32
7.1.1 Refrigerant piping requirements.................................................................................................................... 32
7.1.2 Refrigerant piping insulation.......................................................................................................................... 33
7.1.3 Refrigerant piping length and height difference ........................................................................................... 33
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...................................................................................... 36
7.2.4 Pipe bending guidelines ................................................................................................................................. 36
7.2.5 To flare the pipe end ...................................................................................................................................... 36
7.2.6 Connections between outdoor and indoor unit using reducers................................................................... 37
7.2.7 Using the stop valve and service port............................................................................................................ 38
7.2.8 To connect the refrigerant piping to the outdoor unit ................................................................................. 40
7.3 Checking the refrigerant piping...................................................................................................................................... 40
7.3.1 About checking the refrigerant piping........................................................................................................... 40
7.3.2 Precautions when checking the refrigerant piping........................................................................................ 41
7.3.3 To check for leaks ........................................................................................................................................... 41
7.3.4 To perform vacuum drying............................................................................................................................. 41
8 Charging refrigerant 43
8.1 About charging refrigerant ............................................................................................................................................. 43
8.2 About the refrigerant...................................................................................................................................................... 44
8.3 Precautions when charging refrigerant.......................................................................................................................... 45
8.4 To determine the additional refrigerant amount .......................................................................................................... 45
8.5 To determine the complete recharge amount .............................................................................................................. 45
8.6 To charge additional refrigerant..................................................................................................................................... 45
8.7 To fix the fluorinated greenhouse gases label ............................................................................................................... 46
8.8 To check for refrigerant leaks after charging ................................................................................................................. 46

Table of contents
Installer reference guide
3
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
9 Electrical installation 48
9.1 About connecting the electrical wiring .......................................................................................................................... 48
9.1.1 Precautions when connecting the electrical wiring....................................................................................... 48
9.1.2 Guidelines when connecting the electrical wiring......................................................................................... 50
9.1.3 Specifications of standard wiring components.............................................................................................. 52
9.2 To connect the electrical wiring to the outdoor unit..................................................................................................... 52
10 Finishing the outdoor unit installation 54
10.1 To finish the outdoor unit installation............................................................................................................................ 54
10.2 To close the outdoor unit ............................................................................................................................................... 54
11 Configuration 55
11.1 About standby electricity saving function ...................................................................................................................... 55
11.1.1 To turn ON standby electricity saving function ............................................................................................. 55
11.2 About priority room function ......................................................................................................................................... 56
11.2.1 To set the priority room function................................................................................................................... 56
11.3 About night quiet mode.................................................................................................................................................. 56
11.3.1 To turn ON the night quiet mode .................................................................................................................. 56
11.4 About heat mode lock .................................................................................................................................................... 57
11.4.1 To turn ON heat mode lock............................................................................................................................ 57
12 Commissioning 58
12.1 Overview: Commissioning .............................................................................................................................................. 58
12.2 Precautions when commissioning .................................................................................................................................. 58
12.3 Checklist before commissioning ..................................................................................................................................... 59
12.4 Checklist during commissioning ..................................................................................................................................... 59
12.5 Trial operation and testing ............................................................................................................................................. 59
12.5.1 About wiring error check................................................................................................................................ 60
12.5.2 To perform a test run ..................................................................................................................................... 61
12.6 Starting up the outdoor unit........................................................................................................................................... 62
13 Hand-over to the user 63
14 Maintenance and service 64
14.1 Overview: Maintenance and service .............................................................................................................................. 64
14.2 Maintenance safety precautions .................................................................................................................................... 64
14.3 Checklist for yearly maintenance of the outdoor unit................................................................................................... 65
14.4 About the compressor .................................................................................................................................................... 65
15 Troubleshooting 66
15.1 Overview: Troubleshooting ............................................................................................................................................ 66
15.2 Precautions when troubleshooting ................................................................................................................................ 66
15.3 Solving problems based on symptoms........................................................................................................................... 66
15.3.1 Symptom: Indoor units fall, vibrate or make noise ....................................................................................... 66
15.3.2 Symptom: The unit is NOT heating or cooling as expected........................................................................... 67
15.3.3 Symptom: Water leakage............................................................................................................................... 67
15.3.4 Symptom: Electrical leakage .......................................................................................................................... 67
15.3.5 Symptom: Priority room setting does NOT function ..................................................................................... 67
15.3.6 Symptom: Unit does NOT function or burn damage..................................................................................... 67
15.4 Solving problems based on LED behaviour .................................................................................................................... 67
15.4.1 Fault diagnosis using LED on outdoor unit PCB ............................................................................................. 67
16 Disposal 70
16.1 Overview: Disposal.......................................................................................................................................................... 70
16.2 To pump down ................................................................................................................................................................ 70
16.3 To start and stop forced cooling..................................................................................................................................... 71
17 Technical data 72
17.1 Wiring diagram................................................................................................................................................................ 72
17.1.1 Unified wiring diagram legend ....................................................................................................................... 72
17.2 Piping diagram: Outdoor unit ......................................................................................................................................... 74
18 Glossary 76

1 | About the documentation
Installer reference guide
4
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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.
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.
INFORMATION
This document only describes installation instructions specific to the outdoor unit.
For installation of the indoor unit (mounting the indoor unit, connecting the
refrigerant piping to the indoor unit, connecting the electrical wiring to the indoor
unit …), see the installation manual of the indoor unit.
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 outdoor unit)
▪Outdoor unit installation manual:
-Installation instructions
-Format: Paper (in the box of the outdoor unit)
▪Installer reference guide:
-Preparation of the installation, 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 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).

1 | About the documentation
Installer reference guide
5
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
1.1.1 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:
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".

1 | About the documentation
Installer reference guide
6
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
Symbol Explanation
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 reference guide
7
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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
children, can play with them. Possible risk: 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 reference guide
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4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
▪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: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
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 reference guide
9
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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 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)
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).

2 | General safety precautions
Installer reference guide
10
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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.
0
10
20
30
40
50
60
70 80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
560
570
580
590
600
610
620
630
640
650
660
670
680
690
700
710
720
730
740
750
760
770
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 | General safety precautions
Installer reference guide
11
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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).
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.

2 | General safety precautions
Installer reference guide
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4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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.
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.

2 | General safety precautions
Installer reference guide
13
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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 reference guide
14
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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 reference guide
15
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
To handle the outdoor unit (see "4.1.2To handle the outdoor unit"[ 4
20])
CAUTION
To avoid injury, do NOT touch the air inlet or aluminium fins of the unit.
CAUTION
ONLY handle the outdoor unit as follows:
Unit installation (see "6Unit installation"[ 4
23])
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
23])
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 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.
Opening the unit (see "6.2Opening the unit"[ 4
27])
DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover is removed.

3 | Specific installer safety instructions
Installer reference guide
16
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF ELECTROCUTION
Piping installation (see "7Piping installation"[ 4
32])
CAUTION
Piping and joints of a split system shall be made with permanent joints when inside
an occupied space except joints directly connecting the piping to the indoor units.
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.
CAUTION
Do NOT connect the embedded branch piping and the outdoor unit when only
carrying out piping work without connecting the indoor unit in order to add another
indoor unit later.
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 "8Charging refrigerant"[ 4
43])
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.

3 | Specific installer safety instructions
Installer reference guide
17
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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.
WARNING
NEVER directly touch any accidental leaking refrigerant. This could result in severe
wounds caused by frostbite.
Electrical installation (see "9Electrical installation"[ 4
48])
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.
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
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.

3 | Specific installer safety instructions
Installer reference guide
18
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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.
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 the outdoor unit installation (see "10Finishing the outdoor unit
installation"[
4
54])
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.
Maintenance and service (see "14Maintenance and service"[ 4
64])
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING

3 | Specific installer safety instructions
Installer reference guide
19
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
WARNING
▪Before carrying out any maintenance or repair activity, ALWAYS switch off the
circuit breaker on the supply panel, remove the fuses or open the protection
devices of the unit.
▪Do NOT touch live parts for 10 minutes after the power supply is turned off
because of high voltage risk.
▪Please note that some sections of the electric component box are hot.
▪Make sure you do NOT touch a conductive section.
▪Do NOT rinse the unit. This may cause electric shocks or fire.
DANGER: RISK OF ELECTROCUTION
▪Use this compressor on a grounded system only.
▪Turn the power off before servicing the compressor.
▪Reattach the switch box cover and service lid after servicing.
CAUTION
ALWAYS wear safety glasses and protective gloves.
DANGER: RISK OF EXPLOSION
▪Use a pipe cutter to remove the compressor.
▪Do NOT use the brazing torch.
▪Use approved refrigerants and lubricants only.
DANGER: RISK OF BURNING/SCALDING
Do NOT touch the compressor with bare hands.
Troubleshooting (see "15Troubleshooting"[ 4
66])
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.
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.
DANGER: RISK OF ELECTROCUTION
▪When the unit is NOT operating, the LEDs on the PCB are turned OFF in order to
save power.
▪Even when the LEDs are OFF, the terminal block and the PCB may be powered.

4 | About the box
Installer reference guide
20
4MWXM-A9
R32 Split series
4P708645-1 – 2022.09
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 Outdoor unit
4.1.1 To unpack the outdoor unit
4.1.2 To handle the outdoor unit
CAUTION
To avoid injury, do NOT touch the air inlet or aluminium fins of the unit.