Daikin VRV IV RKXYQ5T8Y1B Series User guide

Installer and user reference guide
VRV IV heat pump for indoor installation
RKXYQ5T8Y1B
RDXYQ5T8V1B
RKXYQ8T7Y1B
RDXYQ8T7V1B

Table of Contents
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
Table of Contents
1 About the documentation 6
1.1 About this document ...................................................................................................................................................... 6
1.2 Meaning of warnings and symbols................................................................................................................................. 7
2 General safety precautions 9
2.1 For the installer............................................................................................................................................................... 9
2.1.1 General ........................................................................................................................................................... 9
2.1.2 Installation site ............................................................................................................................................... 10
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 10
2.1.4 Electrical ......................................................................................................................................................... 12
3 Specific installer safety instructions 15
For the user 18
4 User safety instructions 19
4.1 General............................................................................................................................................................................ 19
4.2 Instructions for safe operation ....................................................................................................................................... 20
5 About the system 23
5.1 System layout.................................................................................................................................................................. 23
6 User interface 24
7 Before operation 25
8 Operation 26
8.1 Operation range.............................................................................................................................................................. 26
8.2 Operating the system ..................................................................................................................................................... 26
8.2.1 About operating the system........................................................................................................................... 26
8.2.2 About cooling, heating, fan only, and automatic operation ......................................................................... 27
8.2.3 About the heating operation.......................................................................................................................... 27
8.2.4 To operate the system (WITHOUT cool/heat changeover remote control switch)...................................... 28
8.2.5 To operate the system (WITH cool/heat changeover remote control switch)............................................. 28
8.3 Using the dry program.................................................................................................................................................... 29
8.3.1 About the dry program................................................................................................................................... 29
8.3.2 To use the dry program (WITHOUT cool/heat changeover remote control switch) .................................... 29
8.3.3 To use the dry program (WITH cool/heat changeover remote control switch) ........................................... 30
8.4 Adjusting the air flow direction ...................................................................................................................................... 30
8.4.1 About the air flow flap.................................................................................................................................... 30
8.5 Setting the master user interface................................................................................................................................... 31
8.5.1 About setting the master user interface........................................................................................................ 31
8.5.2 To designate the master user interface (VRV DX) ......................................................................................... 32
8.5.3 About control systems.................................................................................................................................... 32
9 Energy saving and optimum operation 33
9.1 Available main operation methods ................................................................................................................................ 33
9.2 Available comfort settings .............................................................................................................................................. 34
10 Maintenance and service 35
10.1 Maintenance after a long stop period............................................................................................................................ 35
10.2 Maintenance before a long stop period......................................................................................................................... 36
10.3 About the refrigerant...................................................................................................................................................... 36
10.4 After-sales service and warranty.................................................................................................................................... 36
10.4.1 Warranty period ............................................................................................................................................. 36
10.4.2 Recommended maintenance and inspection................................................................................................ 37
10.4.3 Recommended maintenance and inspection cycles ..................................................................................... 37
10.4.4 Shortened maintenance and replacement cycles ......................................................................................... 38
11 Troubleshooting 39
11.1 Error codes: Overview .................................................................................................................................................... 40
11.2 Symptoms that are NOT system malfunctions............................................................................................................... 42
11.2.1 Symptom: The system does not operate....................................................................................................... 43
11.2.2 Symptom: Cool/Heat cannot be changed over ............................................................................................. 43
11.2.3 Symptom: Fan operation is possible, but cooling and heating do not work ................................................ 43
11.2.4 Symptom: The fan speed does not correspond to the setting...................................................................... 43

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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
11.2.5 Symptom: The fan direction does not correspond to the setting................................................................. 43
11.2.6 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 43
11.2.7 Symptom: White mist comes out of a unit (Indoor unit, heat exchanger unit)............................................ 44
11.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 44
11.2.9 Symptom: Noise of air conditioners (Indoor unit, heat exchanger unit) ...................................................... 44
11.2.10 Symptom: Noise of air conditioners (Indoor unit, compressor unit, heat exchanger unit) ......................... 44
11.2.11 Symptom: Noise of air conditioners (compressor unit, heat exchanger unit).............................................. 44
11.2.12 Symptom: Dust comes out of the heat exchanger unit................................................................................. 44
11.2.13 Symptom: The units can give off odours ....................................................................................................... 44
11.2.14 Symptom: The heat exchanger unit fan does not spin.................................................................................. 45
11.2.15 Symptom: The display shows "88"................................................................................................................. 45
11.2.16 Symptom: The compressor in the compressor unit does not stop after a short heating operation ........... 45
11.2.17 Symptom: The inside of an compressor unit is warm even when the unit has stopped.............................. 45
11.2.18 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 45
12 Relocation 46
13 Disposal 47
For the installer 48
14 About the box 49
14.1 About LOOP BY DAIKIN ................................................................................................................................................... 49
14.2 Overview: About the box................................................................................................................................................ 49
14.3 Compressor unit.............................................................................................................................................................. 50
14.3.1 To unpack the compressor unit ..................................................................................................................... 50
14.3.2 To handle the compressor unit...................................................................................................................... 50
14.3.3 To remove the accessories from the compressor unit.................................................................................. 50
14.3.4 To remove the transportation stay................................................................................................................ 51
14.3.5 To remove the transportation EPS................................................................................................................. 51
14.4 Heat exchanger unit........................................................................................................................................................ 52
14.4.1 To unpack the heat exchanger unit ............................................................................................................... 52
14.4.2 To handle the heat exchanger unit ................................................................................................................ 52
14.4.3 To remove the accessories from the heat exchanger unit............................................................................ 53
14.4.4 To remove the transportation sheet.............................................................................................................. 53
15 About the units and options 54
15.1 Overview: About the units and options.......................................................................................................................... 54
15.2 Identification ................................................................................................................................................................... 54
15.2.1 Identification label: Compressor unit............................................................................................................. 54
15.2.2 Identification label: Heat exchanger unit....................................................................................................... 55
15.3 About the compressor unit and heat exchanger unit.................................................................................................... 55
15.4 System layout.................................................................................................................................................................. 56
15.5 Combining units and options.......................................................................................................................................... 56
15.5.1 About combining units and options............................................................................................................... 57
15.5.2 Possible combinations of indoor units........................................................................................................... 57
15.5.3 Possible options for the compressor unit and heat exchanger unit ............................................................. 57
16 Unit installation 61
16.1 Preparing the installation site......................................................................................................................................... 61
16.1.1 Installation site requirements of the compressor unit.................................................................................. 61
16.1.2 Installation site requirements of the heat exchanger unit............................................................................ 63
16.1.3 Securing safety against refrigerant leaks ....................................................................................................... 64
16.2 Opening the unit ............................................................................................................................................................. 66
16.2.1 About opening the units................................................................................................................................. 66
16.2.2 To open the compressor unit......................................................................................................................... 66
16.2.3 To open the switch box cover of the heat exchanger unit............................................................................ 67
16.3 Mounting the compressor unit....................................................................................................................................... 67
16.3.1 Precautions when mounting the compressor unit........................................................................................ 67
16.3.2 Guidelines when installing the compressor unit ........................................................................................... 67
16.4 Mounting the heat exchanger unit................................................................................................................................. 68
16.4.1 Precautions when mounting the heat exchanger unit .................................................................................. 68
16.4.2 Guidelines when installing the heat exchanger unit ..................................................................................... 68
16.4.3 Guidelines when installing the ducting.......................................................................................................... 69
16.4.4 Guidelines when installing the drain piping................................................................................................... 70
17 Piping installation 72
17.1 Preparing refrigerant piping ........................................................................................................................................... 72
17.1.1 Refrigerant piping requirements.................................................................................................................... 72
17.1.2 Refrigerant piping material ............................................................................................................................ 73

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VRV IV heat pump for indoor installation
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17.1.3 To select the piping size ................................................................................................................................. 73
17.1.4 To select refrigerant branch kits .................................................................................................................... 75
17.1.5 Refrigerant piping length and height difference ........................................................................................... 75
17.2 Connecting the refrigerant piping .................................................................................................................................. 77
17.2.1 About connecting the refrigerant piping ....................................................................................................... 77
17.2.2 Precautions when connecting the refrigerant piping.................................................................................... 77
17.2.3 Pipe bending guidelines ................................................................................................................................. 78
17.2.4 To braze the pipe end..................................................................................................................................... 78
17.2.5 Using the stop valve and service port............................................................................................................ 78
17.2.6 To remove the pinched pipes......................................................................................................................... 81
17.2.7 To connect the refrigerant piping to the compressor unit............................................................................ 82
17.2.8 To connect the refrigerant piping to the heat exchanger unit...................................................................... 84
17.2.9 To connect the refrigerant branching kit....................................................................................................... 85
17.3 Checking the refrigerant piping...................................................................................................................................... 85
17.3.1 About checking the refrigerant piping........................................................................................................... 85
17.3.2 Checking refrigerant piping: General guidelines ........................................................................................... 86
17.3.3 Checking refrigerant piping: Setup ................................................................................................................ 86
17.3.4 To perform a leak test .................................................................................................................................... 87
17.3.5 To perform vacuum drying............................................................................................................................. 88
17.3.6 To insulate the refrigerant piping .................................................................................................................. 89
17.4 Charging refrigerant........................................................................................................................................................ 89
17.4.1 About charging refrigerant............................................................................................................................. 89
17.4.2 Precautions when charging refrigerant ......................................................................................................... 90
17.4.3 To determine the additional refrigerant amount.......................................................................................... 91
17.4.4 To charge refrigerant...................................................................................................................................... 91
17.4.5 Error codes when charging refrigerant.......................................................................................................... 94
17.4.6 To fix the fluorinated greenhouse gases label............................................................................................... 94
18 Electrical installation 95
18.1 About connecting the electrical wiring .......................................................................................................................... 95
18.1.1 Precautions when connecting the electrical wiring....................................................................................... 95
18.1.2 Field wiring: Overview .................................................................................................................................... 97
18.1.3 About the electrical wiring ............................................................................................................................. 99
18.1.4 Guidelines when knocking out knockout holes ............................................................................................. 99
18.1.5 About electrical compliance........................................................................................................................... 99
18.1.6 Safety device requirements ........................................................................................................................... 100
18.2 To connect the electrical wiring on the compressor unit.............................................................................................. 101
18.3 To connect the electrical wiring on the heat exchanger unit........................................................................................ 103
18.4 To finish the transmission wiring.................................................................................................................................... 104
18.5 To close the compressor unit ......................................................................................................................................... 105
18.6 To close the heat exchanger unit ................................................................................................................................... 105
18.7 To check the insulation resistance of the compressor .................................................................................................. 105
19 Configuration 107
19.1 Overview: Configuration................................................................................................................................................. 107
19.2 Making field settings....................................................................................................................................................... 107
19.2.1 About making field settings............................................................................................................................ 107
19.2.2 To access the field setting components......................................................................................................... 108
19.2.3 Field setting components............................................................................................................................... 108
19.2.4 To access mode 1 or 2.................................................................................................................................... 110
19.2.5 To use mode 1 (and default situation)........................................................................................................... 111
19.2.6 To use mode 2 ................................................................................................................................................ 113
19.2.7 Mode 1 (and default situation): Monitoring settings .................................................................................... 114
19.2.8 Mode 2: Field settings .................................................................................................................................... 118
19.2.9 To connect the PC configurator to the compressor unit............................................................................... 122
19.3 Energy saving and optimum operation .......................................................................................................................... 122
19.3.1 Available main operation methods................................................................................................................ 123
19.3.2 Available comfort settings.............................................................................................................................. 124
19.3.3 Example: Automatic mode during cooling..................................................................................................... 126
19.3.4 Example: Automatic mode during heating .................................................................................................... 127
20 Commissioning 129
20.1 Overview: Commissioning .............................................................................................................................................. 129
20.2 Precautions when commissioning.................................................................................................................................. 129
20.3 Checklist before commissioning..................................................................................................................................... 130
20.4 Checklist during commissioning ..................................................................................................................................... 131
20.4.1 About the test run .......................................................................................................................................... 131
20.4.2 To perform a test run (7-LEDs display) .......................................................................................................... 132
20.4.3 To perform a test run (7-segment display).................................................................................................... 133
20.4.4 Correcting after abnormal completion of the test run.................................................................................. 134

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VRV IV heat pump for indoor installation
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20.4.5 Operating the unit .......................................................................................................................................... 134
21 Hand-over to the user 135
22 Maintenance and service 136
22.1 Overview: Maintenance and service .............................................................................................................................. 136
22.2 Maintenance safety precautions.................................................................................................................................... 136
22.2.1 To prevent electrical hazards ......................................................................................................................... 136
22.3 Checklist for yearly maintenance of the heat exchanger unit....................................................................................... 137
22.4 About service mode operation....................................................................................................................................... 137
22.4.1 To use vacuum mode ..................................................................................................................................... 137
22.4.2 To recover refrigerant .................................................................................................................................... 138
23 Troubleshooting 139
23.1 Overview: Troubleshooting ............................................................................................................................................ 139
23.2 Precautions when troubleshooting ................................................................................................................................ 139
23.3 Solving problems based on error codes......................................................................................................................... 139
23.3.1 Error codes: Overview .................................................................................................................................... 140
24 Disposal 146
25 Technical data 147
25.1 Piping diagram: Compressor unit and heat exchanger unit .......................................................................................... 147
25.2 Wiring diagram: Compressor unit .................................................................................................................................. 149
25.3 Wiring diagram: Heat exchanger unit ............................................................................................................................ 152
26 Glossary 154

1 | About the documentation
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
1 About the documentation
In this chapter
1.1 About this document.............................................................................................................................................................. 6
1.2 Meaning of warnings and symbols......................................................................................................................................... 7
1.1 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 accessory bag of the compressor unit)
▪Compressor unit installation and operation manual:
-Installation and operation instructions
-Format: Paper (in the accessory bag of the compressor unit)
▪Heat exchanger unit installation manual:
-Installation instructions
-Format: Paper (in the accessory bag of the heat exchanger 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 http://www.daikineurope.com/support-and-manuals/
product-information/
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your dealer.
The original documentation is written in English. All other languages are
translations.
Technical engineering data
▪A subset of the latest technical data is available on the regional Daikin website
(publicly accessible).
▪The full set of latest technical data is available on the Daikin Business Portal
(authentication required).

1 | About the documentation
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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
1.2 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
NOTICE
Indicates a situation that could result in equipment or property damage.
INFORMATION
Indicates useful tips or additional information.
Symbols used on the unit:
Symbol Explanation
Before installation, read the installation and operation
manual, and the wiring instruction sheet.
Before performing maintenance and service tasks, read the
service manual.
For more information, see the installer and user reference
guide.
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 and user reference guide
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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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 and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
2 General safety precautions
In this chapter
2.1 For the installer....................................................................................................................................................................... 9
2.1.1 General ................................................................................................................................................................... 9
2.1.2 Installation site ....................................................................................................................................................... 10
2.1.3 Refrigerant — in case of R410A or R32 ................................................................................................................. 10
2.1.4 Electrical ................................................................................................................................................................. 12
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).
CAUTION
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially
children, can play with them. Possible risk: suffocation.
WARNING
Provide adequate measures to prevent that the unit can be used as a shelter by small
animals. Small animals that make contact with electrical parts can cause
malfunctions, smoke or fire.
CAUTION
Do NOT touch the air inlet or aluminium fins of the unit.

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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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.
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.
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
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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
WARNING
During tests, NEVER pressurize 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.
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
ALWAYS recover the refrigerant. Do NOT release them directly into the environment.
Use a vacuum pump to evacuate the installation.
NOTICE
After all the piping has been connected, make sure there is no gas leak. Use nitrogen
to perform a gas leak detection.
NOTICE
▪To avoid compressor breakdown, do NOT charge more than the specified amount
of refrigerant.
▪When the refrigerant system is to be opened, refrigerant MUST be treated
according to the applicable legislation.
WARNING
Make sure there is no oxygen in the system. Refrigerant may only be charged after
performing the leak test and the vacuum drying.
Possible consequence: Self-combustion and explosion of the compressor because of
oxygen going into the operating compressor.
▪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:

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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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 and user reference guide
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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
WARNING
▪ONLY use copper wires.
▪Make sure the field wiring complies with the applicable legislation.
▪All field wiring MUST be performed in accordance with the wiring diagram
supplied with the product.
▪NEVER squeeze bundled cables and make sure they do NOT come in contact with
the piping and sharp edges. Make sure no external pressure is applied to the
terminal connections.
▪Make sure to install earth wiring. Do NOT earth the unit to a utility pipe, surge
absorber, or telephone earth. Incomplete earth may cause electrical shock.
▪Make sure to use a dedicated power circuit. NEVER use a power supply shared by
another appliance.
▪Make sure to install the required fuses or circuit breakers.
▪Make sure to install an earth leakage protector. Failure to do so may cause
electrical shock or fire.
▪When installing the earth leakage protector, make sure it is compatible with the
inverter (resistant to high frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
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.
Install power cables at least 1 m away from televisions or radios to prevent
interference. Depending on the radio waves, a distance of 1 m may not be
sufficient.

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VRV IV heat pump for indoor installation
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WARNING
▪After finishing the electrical work, confirm that each electrical component and
terminal inside the electrical components box is connected securely.
▪Make sure all covers are closed before starting up the unit.
NOTICE
Only applicable if the power supply is three‑phase, and the compressor has an ON/
OFF starting method.
If there exists the possibility of reversed phase after a momentary black out and the
power goes on and off while the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed phase can break the
compressor and other parts.

3 | Specific installer safety instructions
Installer and user reference guide
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VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially
children, can play with them. Possible risk: 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
Excessive refrigerant concentrations in a closed room can lead to oxygen deficiency.
DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover is removed.
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF ELECTROCUTION
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 pressurize the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).
CAUTION
Do not vent gases into the atmosphere.
WARNING
Any gas or oil remaining inside the stop valve may blow off the spun piping.
If these instructions are NOT followed correctly it may result in property damage or
personal injury, which may be serious depending on the circumstances.

3 | Specific installer safety instructions
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
WARNING
▪ONLY use R410A as refrigerant. Other substances may cause explosions and
accidents.
▪R410A contains fluorinated greenhouse gases. Its global warming potential (GWP)
value is 2087.5. Do NOT vent these gases into the atmosphere.
▪When charging refrigerant, ALWAYS use protective gloves and safety glasses.
CAUTION
Do NOT push or place redundant cable length in 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 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, stranded conductor 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
▪All wiring MUST be performed by an authorised electrician and MUST comply
with the applicable legislation.
▪Make electrical connections to the fixed wiring.
▪All components procured on-site and all electrical construction MUST comply
with the applicable legislation.
WARNING
ALWAYS use multicore cable for power supply cables.

3 | Specific installer safety instructions
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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.
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.

For the user
Installer and user reference guide
18
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
For the user

4 | User safety instructions
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
4 User safety instructions
Always observe the following safety instructions and regulations.
In this chapter
4.1 General.................................................................................................................................................................................... 19
4.2 Instructions for safe operation............................................................................................................................................... 20
4.1 General
WARNING
If you are NOT sure how to operate the unit, contact your
installer.
WARNING
Children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of
experience and knowledge can only use this appliance if
they have been given supervision or instruction concerning
the use of the appliance by a person responsible for their
safety.
Children MUST NOT play with the appliance.
Cleaning and user maintenance MUST NOT be carried out
by children without supervision.
WARNING
To prevent electrical shocks or fire:
▪Do NOT rinse the unit.
▪Do NOT operate the unit with wet hands.
▪Do NOT place any objects containing water on the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the
unit.
▪Do NOT sit, climb or stand on the unit.

4 | User safety instructions
Installer and user reference guide
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RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
▪Units are marked with the following symbol:
This means that electrical and electronic products may NOT be mixed with
unsorted household waste. Do NOT try to dismantle the system yourself: the
dismantling of the system, treatment of the refrigerant, of oil and of other parts
must be done by an authorized installer and must comply with applicable
legislation.
Units must be treated at a specialized treatment facility for reuse, recycling and
recovery. By ensuring this product is disposed of correctly, you will help to
prevent potential negative consequences for the environment and human
health. For more information, contact your installer or local authority.
▪Batteries are marked with the following symbol:
This means that the batteries may NOT be mixed with unsorted household
waste. If a chemical symbol is printed beneath the symbol, this chemical symbol
means that the battery contains a heavy metal above a certain concentration.
Possible chemical symbols are: Pb: lead (>0.004%).
Waste batteries must be treated at a specialized treatment facility for reuse. By
ensuring waste batteries are disposed of correctly, you will help to prevent
potential negative consequences for the environment and human health.
4.2 Instructions for safe operation
CAUTION
▪NEVER touch the internal parts of the controller.
▪Do NOT remove the front panel. Some parts inside are
dangerous to touch and appliance problems may
happen. For checking and adjusting the internal parts,
contact your dealer.
CAUTION
Do NOT operate the system when using a room
fumigation-type insecticide. Chemicals could collect in the
unit, and endanger the health of people who are
hypersensitive to chemicals.
CAUTION
It is unhealthy to expose your body to the air flow for a
long time.