Daikin VRV 5 RXYA8A7Y1B User guide

Installer and user reference guide
VRV 5 heat pump
RXYA8A7Y1B
RXYA10A7Y1B
RXYA12A7Y1B
RXYA14A7Y1B
RXYA16A7Y1B
RXYA18A7Y1B
RXYA20A7Y1B
RYMA5A7Y1B

Table of contents
Installer and user reference guide
2
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
Table of contents
1 About this document 6
1.1 Meaning of warnings and symbols................................................................................................................................. 6
2 General safety precautions 8
2.1 For the installer............................................................................................................................................................... 8
2.1.1 General ........................................................................................................................................................... 8
2.1.2 Installation site ............................................................................................................................................... 9
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 9
2.1.4 Electrical ......................................................................................................................................................... 11
3 Specific installer safety instructions 14
3.1 Instructions for equipment using R32 refrigerant ......................................................................................................... 18
For the user 20
4 User safety instructions 21
4.1 General............................................................................................................................................................................ 21
4.2 Instructions for safe operation ....................................................................................................................................... 22
5 About the system 27
5.1 System layout.................................................................................................................................................................. 28
6 User interface 29
7 Operation 30
7.1 Before operation............................................................................................................................................................. 30
7.2 Operation range.............................................................................................................................................................. 30
7.3 Operating the system ..................................................................................................................................................... 31
7.3.1 About operating the system........................................................................................................................... 31
7.3.2 About cooling, heating, fan only, and automatic operation ......................................................................... 31
7.3.3 About the heating operation.......................................................................................................................... 31
7.3.4 To operate the system (WITHOUT cool/heat changeover remote control switch)...................................... 32
7.3.5 To operate the system (WITH cool/heat changeover remote control switch)............................................. 33
7.4 Using the dry program.................................................................................................................................................... 33
7.4.1 About the dry program................................................................................................................................... 33
7.4.2 To use the dry program (WITHOUT cool/heat changeover remote control switch) .................................... 34
7.4.3 To use the dry program (WITH cool/heat changeover remote control switch) ........................................... 34
7.5 Adjusting the air flow direction ...................................................................................................................................... 35
7.5.1 About the air flow flap.................................................................................................................................... 35
7.6 Setting the master user interface................................................................................................................................... 36
7.6.1 About setting the master user interface........................................................................................................ 36
7.6.2 To designate the master user interface......................................................................................................... 36
7.7 About control systems .................................................................................................................................................... 36
8 Energy saving and optimum operation 38
8.1 Available main operation methods ................................................................................................................................ 39
8.2 Available comfort settings .............................................................................................................................................. 39
9 Maintenance and service 40
9.1 Precautions for maintenance and service...................................................................................................................... 40
9.2 Maintenance before a long stop period......................................................................................................................... 40
9.3 Maintenance after a long stop period............................................................................................................................ 40
9.4 About the refrigerant...................................................................................................................................................... 41
9.5 After-sales service........................................................................................................................................................... 41
9.5.1 Recommended maintenance and inspection................................................................................................ 41
9.5.2 Recommended maintenance and inspection cycles ..................................................................................... 42
9.5.3 Shortened maintenance and replacement cycles ......................................................................................... 42
10 Troubleshooting 44
10.1 Error codes: Overview .................................................................................................................................................... 45
10.2 Symptoms that are NOT system malfunctions............................................................................................................... 48
10.2.1 Symptom: The system does not operate....................................................................................................... 48
10.2.2 Symptom: Cool/Heat cannot be changed over ............................................................................................. 48
10.2.3 Symptom: Fan operation is possible, but cooling and heating do not work ................................................ 48
10.2.4 Symptom: The fan speed does not correspond to the setting...................................................................... 48
10.2.5 Symptom: The fan direction does not correspond to the setting................................................................. 49

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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
10.2.6 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 49
10.2.7 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 49
10.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 49
10.2.9 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 49
10.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 50
10.2.11 Symptom: Noise of air conditioners (Outdoor unit)...................................................................................... 50
10.2.12 Symptom: Dust comes out of the unit........................................................................................................... 50
10.2.13 Symptom: The units can give off odours ....................................................................................................... 50
10.2.14 Symptom: The outdoor unit fan does not spin.............................................................................................. 50
10.2.15 Symptom: The display shows "88"................................................................................................................. 50
10.2.16 Symptom: The compressor in the outdoor unit does not stop after a short heating operation ................. 50
10.2.17 Symptom: The inside of an outdoor unit is warm even when the unit has stopped.................................... 50
10.2.18 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 50
11 Relocation 51
12 Disposal 52
13 Technical data 53
13.1 Eco Design requirements................................................................................................................................................ 53
For the installer 54
14 About the box 55
14.1 To unpack the outdoor unit............................................................................................................................................ 56
14.2 To remove the accessories from the outdoor unit ........................................................................................................ 56
14.3 Accessory pipes: Diameters............................................................................................................................................ 57
14.4 To remove the transportation stay (only for 5~12 HP).................................................................................................. 57
15 About the units and options 59
15.1 Identification label: Outdoor unit................................................................................................................................... 59
15.2 About the outdoor unit................................................................................................................................................... 60
15.3 System layout.................................................................................................................................................................. 60
15.4 Combining units and options.......................................................................................................................................... 61
15.4.1 About combining units and options............................................................................................................... 61
15.4.2 Possible combinations of indoor units........................................................................................................... 61
15.4.3 Possible combinations of outdoor units ........................................................................................................ 62
15.4.4 Possible options for the outdoor unit ............................................................................................................ 62
15.5 About the piping connections ........................................................................................................................................ 64
16 Special requirements for R32 units 65
16.1 Installation space requirements ..................................................................................................................................... 65
16.2 System layout requirements........................................................................................................................................... 65
16.3 To determine the required safety measures ................................................................................................................. 68
16.3.1 Overview: flowchart ....................................................................................................................................... 72
16.4 Safety measures.............................................................................................................................................................. 72
16.4.1 No safety measure.......................................................................................................................................... 72
16.4.2 Alarm............................................................................................................................................................... 73
16.4.3 Natural ventilation.......................................................................................................................................... 74
16.4.4 Shut-off valves ................................................................................................................................................ 77
16.4.5 Overview: flowchart ....................................................................................................................................... 80
16.5 Combinations of safety measures .................................................................................................................................. 81
17 Unit installation 82
17.1 Preparing the installation site......................................................................................................................................... 82
17.1.1 Installation site requirements of the outdoor unit........................................................................................ 82
17.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 85
17.2 Opening the unit ............................................................................................................................................................. 87
17.2.1 About opening the units................................................................................................................................. 87
17.2.2 To open the outdoor unit............................................................................................................................... 87
17.2.3 To open the switch box of the outdoor unit.................................................................................................. 87
17.3 Mounting the outdoor unit............................................................................................................................................. 88
17.3.1 To provide the installation structure ............................................................................................................. 88
17.3.2 To install the outdoor unit ............................................................................................................................. 89
18 Piping installation 90
18.1 Preparing refrigerant piping ........................................................................................................................................... 90
18.1.1 Refrigerant piping requirements.................................................................................................................... 90
18.1.2 Refrigerant piping material ............................................................................................................................ 91
18.1.3 Refrigerant piping insulation .......................................................................................................................... 91

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Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
18.1.4 To select the piping size ................................................................................................................................. 91
18.1.5 To select refrigerant branch kits .................................................................................................................... 93
18.1.6 Installation limitations .................................................................................................................................... 94
18.1.7 About the piping length.................................................................................................................................. 96
18.1.8 Single and multi-outdoor-unit combinations................................................................................................. 98
18.1.9 Multiple outdoor units: Possible layouts ....................................................................................................... 100
18.2 Connecting the refrigerant piping .................................................................................................................................. 102
18.2.1 About connecting the refrigerant piping ....................................................................................................... 102
18.2.2 Precautions when connecting the refrigerant piping.................................................................................... 102
18.2.3 Multiple outdoor units: Knockout holes ........................................................................................................ 103
18.2.4 Using the stop valve and service port ............................................................................................................ 103
18.2.5 To route the refrigerant piping ...................................................................................................................... 105
18.2.6 To protect against contamination.................................................................................................................. 106
18.2.7 To remove the pinched pipes......................................................................................................................... 107
18.2.8 To braze the pipe end..................................................................................................................................... 108
18.2.9 To connect the refrigerant piping to the outdoor unit ................................................................................. 108
18.2.10 To connect the multi connection piping kit ................................................................................................... 109
18.2.11 To connect the refrigerant branching kit....................................................................................................... 110
18.3 Checking the refrigerant piping...................................................................................................................................... 110
18.3.1 About checking the refrigerant piping ........................................................................................................... 110
18.3.2 Checking refrigerant piping: General guidelines ........................................................................................... 111
18.3.3 Checking refrigerant piping: Setup ................................................................................................................ 112
18.3.4 To perform a leak test .................................................................................................................................... 112
18.3.5 To perform vacuum drying............................................................................................................................. 113
18.3.6 To insulate the refrigerant piping .................................................................................................................. 114
18.3.7 To check for leaks after charging refrigerant................................................................................................. 115
19 Charging refrigerant 116
19.1 Precautions when charging refrigerant.......................................................................................................................... 116
19.2 About charging refrigerant ............................................................................................................................................. 117
19.3 To determine the additional refrigerant amount .......................................................................................................... 117
19.4 To charge refrigerant: Flow chart................................................................................................................................... 120
19.5 To charge refrigerant ...................................................................................................................................................... 120
19.6 Error codes when charging refrigerant .......................................................................................................................... 123
19.7 Checks after charging refrigerant................................................................................................................................... 123
19.8 To fix the fluorinated greenhouse gases label ............................................................................................................... 123
19.9 To check refrigerant piping joints for leaks after charging refrigerant ......................................................................... 124
20 Electrical installation 125
20.1 About connecting the electrical wiring .......................................................................................................................... 125
20.1.1 Precautions when connecting the electrical wiring....................................................................................... 125
20.1.2 About the electrical wiring ............................................................................................................................. 127
20.1.3 Guidelines when knocking out knockout holes ............................................................................................. 128
20.1.4 Guidelines when connecting the electrical wiring......................................................................................... 129
20.1.5 About electrical compliance........................................................................................................................... 131
20.1.6 Specifications of standard wiring components.............................................................................................. 132
20.2 To route and fix the interconnection wiring .................................................................................................................. 134
20.3 To connect the interconnection wiring .......................................................................................................................... 135
20.4 To finish the interconnection wiring .............................................................................................................................. 136
20.5 To route and fix the power supply ................................................................................................................................. 136
20.6 To connect the power supply ......................................................................................................................................... 137
20.7 To connect the external outputs .................................................................................................................................... 138
20.8 To check the insulation resistance of the compressor .................................................................................................. 139
21 Configuration 141
21.1 Making field settings....................................................................................................................................................... 141
21.1.1 About making field settings............................................................................................................................ 141
21.1.2 Field setting components ............................................................................................................................... 142
21.1.3 To access the field setting components......................................................................................................... 143
21.1.4 To access mode 1 or 2 .................................................................................................................................... 143
21.1.5 To use mode 1 ................................................................................................................................................ 144
21.1.6 To use mode 2 ................................................................................................................................................ 145
21.1.7 Mode 1: monitoring settings.......................................................................................................................... 146
21.1.8 Mode 2: field settings..................................................................................................................................... 148
21.1.9 Indoor unit field setting.................................................................................................................................. 155
21.2 Energy saving and optimum operation .......................................................................................................................... 156
21.2.1 Available main operation methods ................................................................................................................ 156
21.2.2 Available comfort settings.............................................................................................................................. 157
21.2.3 Example: Automatic mode during cooling..................................................................................................... 159
21.2.4 Example: Automatic mode during heating .................................................................................................... 160

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VRV 5 heat pump
4P749918-1 – 2023.12
21.3 Using the leak detection function .................................................................................................................................. 161
21.3.1 About automatic leak detection .................................................................................................................... 161
21.3.2 To manually perform a leak detection........................................................................................................... 161
22 Commissioning 163
22.1 Overview: Commissioning .............................................................................................................................................. 163
22.2 Precautions when commissioning .................................................................................................................................. 163
22.3 Checklist before commissioning..................................................................................................................................... 164
22.4 Checklist during commissioning ..................................................................................................................................... 165
22.5 About the SV unit test run .............................................................................................................................................. 166
22.6 About the system test run .............................................................................................................................................. 166
22.6.1 To perform a test run ..................................................................................................................................... 166
22.6.2 Correcting after abnormal completion of the test run.................................................................................. 167
22.7 To perform a SV/indoor unit connection check ............................................................................................................. 168
22.8 Operating the unit........................................................................................................................................................... 170
23 Hand-over to the user 171
24 Maintenance and service 172
24.1 Maintenance safety precautions.................................................................................................................................... 172
24.1.1 To prevent electrical hazards ......................................................................................................................... 172
24.2 Checklist for yearly maintenance of the outdoor unit................................................................................................... 173
24.3 About service mode operation....................................................................................................................................... 173
24.3.1 To use vacuum mode ..................................................................................................................................... 174
24.3.2 To recover refrigerant .................................................................................................................................... 174
24.3.3 Before the maintenance and service of a system with SV unit..................................................................... 174
24.4 SV unit maintenance and service label........................................................................................................................... 174
25 Troubleshooting 176
25.1 Overview: Troubleshooting ............................................................................................................................................ 176
25.2 Precautions when troubleshooting ................................................................................................................................ 176
25.3 Solving problems based on error codes ......................................................................................................................... 176
25.3.1 Error codes: Overview .................................................................................................................................... 177
25.4 Refrigerant leak detection system.................................................................................................................................. 184
26 Disposal 187
27 Technical data 188
27.1 Service space: Outdoor unit ........................................................................................................................................... 188
27.2 Piping diagram: Outdoor unit ......................................................................................................................................... 190
27.3 Wiring diagram: Outdoor unit ........................................................................................................................................ 193
28 Glossary 196

1 | About this document
Installer and user reference guide
6
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
1 About this document
Target audience
Authorised installers + end users
INFORMATION
This appliance is intended to be used by expert or trained users in shops, in light
industry and on farms, or for commercial use by lay persons.
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 and operation manual:
-Installation and operation instructions
-Format: paper (in the box of the outdoor unit)
▪Installer and user reference guide:
-Preparation of the installation, 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.
The latest revision of the supplied documentation is published on the regional
Daikin website and is available via your dealer.
The original instructions are written in English. All other languages are translations
of the original instructions.
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.

1 | About this document
Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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.
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 | General safety precautions
Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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
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.
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.
NOTICE
Works executed on the outdoor unit are best done under dry weather conditions to
avoid water ingress.

2 | General safety precautions
Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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.
2.1.2 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.
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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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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.
▪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.

2 | General safety precautions
Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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.

2 | General safety precautions
Installer and user reference guide
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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 switch 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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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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
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RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
Installation site (see "17.1Preparing the installation site"[ 4
82])
WARNING
Follow the service space dimensions in this manual to install the unit correctly. See
"27.1Service space: Outdoor unit"[4188].
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.
CAUTION
Appliance NOT accessible to the general public, install it in a secured area, protected
from easy access.
This unit, both indoor and outdoor, is suitable for installation in a commercial and
light industrial environment.
CAUTION
This equipment is NOT intended for use in residential locations and will NOT
guarantee to provide adequate protection to radio reception in such locations.
CAUTION
Excessive refrigerant concentrations in a closed room can lead to oxygen deficiency.
WARNING
If the appliance contains R32 refrigerant, the floor area of the room in which the
appliance is stored shall be at least 956m².
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.
Opening the unit (see "17.2Opening the unit"[ 4
87])
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF ELECTROCUTION

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DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover is removed.
Mounting the outdoor unit (see "17.3Mounting the outdoor unit"[ 4
88])
WARNING
Fixing method of the outdoor unit MUST be in accordance with the instructions from
this manual. See "17.3Mounting the outdoor unit"[488].
Connecting the refrigerant piping (see "18.2Connecting the refrigerant
piping"[
4
102])
WARNING
Field piping MUST be in accordance with the instructions from this manual. See
"18Piping installation"[490].
CAUTION
Piping MUST be installed according to instructions given in "18 Piping
installation" [4 90]. Only mechanical joints (e.g. braze+flare connections) that are
compliant with the latest version of ISO14903 can be used.
Low temperature solder alloys shall not be used for pipe connections.
CAUTION
▪Do NOT use mineral oil on flared part.
▪Do NOT reuse piping from previous installations.
▪NEVER install a drier to this unit to guarantee its lifetime. The drying material may
dissolve and damage the system.
CAUTION
Install the refrigerant piping or components in a position where they are unlikely to
be exposed to any substance which may corrode components containing refrigerant,
unless the components are constructed of materials that are inherently resistant to
corrosion or are suitably protected against corrosion.
WARNING
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
During tests, NEVER pressurise the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).

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CAUTION
Do NOT vent gases into the atmosphere.
WARNING
Any gas or oil remaining inside the stop valve may blow off the pinched piping.
Failure to observe the instructions in procedure below properly may result in
property damage or personal injury, which may be serious depending on the
circumstances.
WARNING
NEVER remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the pinched piping.
Charging refrigerant (see "19Charging refrigerant"[ 4
116])
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
Charging of refrigerant MUST be in accordance with the instructions from this
manual. See "19Charging refrigerant"[4116].
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.
Electrical installation (see "20Electrical installation"[ 4
125])
WARNING
Electrical wiring MUST be in accordance with the instructions from:
▪This manual. See "20Electrical installation"[4125].
▪The wiring diagram, which is delivered with the unit, located at the inside of the
service cover. For a translation of its legend, see "27.3Wiring diagram: Outdoor
unit"[4193].

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WARNING
The appliance MUST be installed in accordance with national wiring regulations.
CAUTION
Do NOT push or place redundant cable length into the unit.
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
▪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
The electrical components shall only be replaced with parts specified by the
appliance manufacturer. Replacement with other parts may result in the ignition of
refrigerant in the event of a leak.
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
ALWAYS use multicore cable for power supply cables.
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.

3 | Specific installer safety instructions
Installer and user reference guide
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Commissioning (see "22Commissioning"[ 4
163])
WARNING
Commissioning MUST be in accordance with the instructions from this manual. See
"22Commissioning"[4163].
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 "25Troubleshooting"[ 4
176])
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.
3.1 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.

3 | Specific installer safety instructions
Installer and user reference guide
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WARNING
The appliance shall be stored as follows:
▪in such a way as to prevent mechanical damage.
▪in a well-ventilated room without continuously operating ignition sources
(example: open flames, an operating gas appliance or an operating electric
heater).
▪in a room with dimensions as specified in "16 Special requirements for R32
units"[465].
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
▪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.
See "To determine the charge limit" [4 77] to check if your system meets the
requirement for charge limitation.

For the user
Installer and user reference guide
20
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
For the user