Daikin RYYQ12U7Y1B User guide

Installer and user reference guide
VRV IV+ heat pump English
Installer and user
reference guide
VRV IV+ heat pump
RYYQ8U7Y1B*
RYYQ10U7Y1B*
RYYQ12U7Y1B*
RYYQ14U7Y1B*
RYYQ16U7Y1B*
RYYQ18U7Y1B*
RYYQ20U7Y1B*
RYMQ8U7Y1B*
RYMQ10U7Y1B*
RYMQ12U7Y1B*
RYMQ14U7Y1B*
RYMQ16U7Y1B*
RYMQ18U7Y1B*
RYMQ20U7Y1B*
RXYQ8U7Y1B*
RXYQ10U7Y1B*
RXYQ12U7Y1B*
RXYQ14U7Y1B*
RXYQ16U7Y1B*
RXYQ18U7Y1B*
RXYQ20U7Y1B*

Table of contents
Installer and user reference guide
2
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
Table of contents
1 General safety precautions 3
1.1 About the documentation .......................................................... 3
1.1.1 Meaning of warnings and symbols.............................. 3
1.2 For the user ............................................................................... 4
1.3 For the installer.......................................................................... 4
1.3.1 General ....................................................................... 4
1.3.2 Installation site ............................................................ 5
1.3.3 Refrigerant .................................................................. 5
1.3.4 Brine............................................................................ 6
1.3.5 Water .......................................................................... 6
1.3.6 Electrical ..................................................................... 6
2 About the documentation 7
2.1 About this document.................................................................. 7
For the installer 7
3 About the box 7
3.1 Overview: About the box ........................................................... 7
3.2 To unpack the outdoor unit........................................................ 7
3.3 To remove the accessories from the outdoor unit ..................... 8
3.4 Accessory pipes: Diameters...................................................... 8
3.5 To remove the transportation stay............................................. 8
4 About the units and options 9
4.1 Overview: About the units and options...................................... 9
4.2 Identification label: Outdoor unit................................................ 9
4.3 About the outdoor unit ............................................................... 9
4.4 System layout............................................................................ 9
4.5 Combining units and options ..................................................... 9
4.5.1 About combining units and options............................. 9
4.5.2 Possible combinations of indoor units......................... 10
4.5.3 Possible combinations of outdoor units ...................... 10
4.5.4 Possible options for the outdoor unit........................... 10
5 Preparation 11
5.1 Overview: Preparation............................................................... 11
5.2 Preparing the installation site .................................................... 11
5.2.1 Installation site requirements of the outdoor unit ........ 11
5.2.2 Additional installation site requirements of the
outdoor unit in cold climates ....................................... 12
5.2.3 Securing safety against refrigerant leaks.................... 12
5.3 Preparing refrigerant piping....................................................... 13
5.3.1 Refrigerant piping requirements.................................. 13
5.3.2 To select the piping size ............................................. 13
5.3.3 To select refrigerant branch kits.................................. 15
5.3.4 About the piping length ............................................... 15
5.3.5 Piping length: VRV DX only ........................................ 16
5.3.6 Piping length: VRV DX and Hydrobox ........................ 17
5.3.7 Piping length: VRV DX and RA DX............................. 17
5.3.8 Multiple outdoor units: Possible layouts...................... 18
5.4 Preparing electrical wiring ......................................................... 19
5.4.1 About preparing electrical wiring................................. 19
5.4.2 About electrical compliance ........................................ 19
5.4.3 Safety device requirements ........................................ 19
6 Installation 20
6.1 Overview: Installation ................................................................ 20
6.2 Opening the units ...................................................................... 20
6.2.1 To open the outdoor unit............................................. 20
6.2.2 To open the electrical component box of the outdoor
unit .............................................................................. 20
6.3 Mounting the outdoor unit.......................................................... 21
6.3.1 To provide the installation structure............................ 21
6.4 Connecting the refrigerant piping .............................................. 21
6.4.1 Precautions when connecting the refrigerant piping.... 21
6.4.2 About connecting the refrigerant piping ....................... 22
6.4.3 To route the refrigerant piping...................................... 22
6.4.4 To connect the refrigerant piping to the outdoor unit ... 22
6.4.5 To connect the multi connection piping kit................... 22
6.4.6 Multiple outdoor units: Knockout holes ........................ 23
6.4.7 To connect the refrigerant branching kit ...................... 23
6.4.8 To protect against contamination................................. 23
6.4.9 To braze the pipe end .................................................. 23
6.4.10 Using the stop valve and service port .......................... 24
6.4.11 To remove the pinched pipes....................................... 24
6.5 Checking the refrigerant piping .................................................. 25
6.5.1 About checking the refrigerant piping .......................... 25
6.5.2 Checking refrigerant piping: General guidelines.......... 25
6.5.3 Checking refrigerant piping: Setup............................... 25
6.5.4 To perform a leak test .................................................. 26
6.5.5 To perform vacuum drying ........................................... 26
6.6 To insulate the refrigerant piping................................................ 26
6.7 Charging refrigerant ................................................................... 27
6.7.1 Precautions when charging refrigerant ........................ 27
6.7.2 About charging refrigerant ........................................... 27
6.7.3 To determine the additional refrigerant amount........... 27
6.7.4 To charge refrigerant: Flow chart................................. 29
6.7.5 To charge refrigerant ................................................... 30
6.7.6 Step 6a: To automatically charge refrigerant............... 31
6.7.7 Step 6b: To manually charge refrigerant...................... 32
6.7.8 Error codes when charging refrigerant......................... 33
6.7.9 Checks after charging refrigerant................................. 33
6.7.10 To fix the fluorinated greenhouse gases label ............. 33
6.8 Connecting the electrical wiring.................................................. 33
6.8.1 Precautions when connecting the electrical wiring ...... 33
6.8.2 Field wiring: Overview.................................................. 34
6.8.3 About the electrical wiring ............................................ 34
6.8.4 Guidelines when knocking out knockout holes ............ 35
6.8.5 To route and fix the transmission wiring ...................... 35
6.8.6 To connect the transmission wiring.............................. 35
6.8.7 To finish the transmission wiring.................................. 36
6.8.8 To route and fix the power supply................................ 36
6.8.9 To connect the power supply ....................................... 36
7 Configuration 37
7.1 Overview: Configuration ............................................................. 37
7.2 Making field settings................................................................... 37
7.2.1 About making field settings .......................................... 37
7.2.2 Field setting components ............................................. 38
7.2.3 To access the field setting components....................... 38
7.2.4 To access mode 1 or 2 ................................................ 38
7.2.5 To use mode 1 ............................................................. 38
7.2.6 To use mode 2 ............................................................. 39
7.2.7 Mode 1: Monitoring settings......................................... 39
7.2.8 Mode 2: Field settings.................................................. 40
7.2.9 To connect the PC configurator to the outdoor unit ..... 43
7.3 Energy saving and optimum operation....................................... 43
7.3.1 Available main operation methods............................... 43
7.3.2 Available comfort settings ............................................ 44
7.3.3 Example: Automatic mode during cooling.................... 45
7.3.4 Example: Automatic mode during heating ................... 45
7.4 Using the leak detection function ............................................... 46
7.4.1 About automatic leak detection.................................... 46
7.4.2 To manually perform a leak detection.......................... 46
8 Commissioning 46
8.1 Overview: Commissioning.......................................................... 46
8.2 Precautions when commissioning .............................................. 47
8.3 Checklist before commissioning................................................. 47
8.4 About the test run ....................................................................... 47
8.5 To perform a test run.................................................................. 48
8.6 Correcting after abnormal completion of the test run ................. 49
8.7 Operating the unit....................................................................... 49

1 General safety precautions
Installer and user reference guide
3
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
9 Maintenance and service 49
9.1 Overview: Maintenance and service ......................................... 49
9.2 Maintenance safety precautions................................................ 49
9.2.1 To prevent electrical hazards...................................... 49
9.3 About service mode operation................................................... 49
9.3.1 To use vacuum mode ................................................. 49
9.3.2 To recover refrigerant ................................................. 49
10 Troubleshooting 50
10.1 Overview: Troubleshooting........................................................ 50
10.2 Solving problems based on error codes.................................... 50
10.3 Error codes: Overview ............................................................... 50
11 Disposal 53
12 Technical data 54
12.1 Overview: Technical data .......................................................... 54
12.2 Service space: Outdoor unit ...................................................... 54
12.3 Piping diagram: Outdoor unit..................................................... 55
12.4 Wiring diagram: Outdoor unit .................................................... 58
For the user 60
13 About the system 60
13.1 System layout ............................................................................ 60
14 User interface 60
15 Before operation 60
16 Operation 61
16.1 Operation range ........................................................................ 61
16.2 Operating the system ................................................................ 61
16.2.1 About operating the system ........................................ 61
16.2.2 About cooling, heating, fan only, and automatic
operation ..................................................................... 61
16.2.3 About the heating operation........................................ 61
16.2.4 To operate the system (WITHOUT cool/heat
changeover remote control switch) ............................. 62
16.2.5 To operate the system (WITH cool/heat changeover
remote control switch)................................................. 62
16.3 Using the dry program ............................................................... 62
16.3.1 About the dry program ................................................ 62
16.3.2 To use the dry program (WITHOUT cool/heat
changeover remote control switch) ............................. 62
16.3.3 To use the dry program (WITH cool/heat changeover
remote control switch)................................................. 62
16.4 Adjusting the air flow direction................................................... 63
16.4.1 About the air flow flap ................................................. 63
16.5 Setting the master user interface .............................................. 63
16.5.1 About setting the master user interface ...................... 63
16.5.2 To designate the master user interface (VRV DX and
Hydrobox) ................................................................... 63
16.5.3 To designate the master user interface (VRV DX and
RA DX)........................................................................ 63
16.6 About control systems ............................................................... 64
17 Energy saving and optimum operation 64
17.1 Available main operation methods ............................................ 64
17.2 Available comfort settings ......................................................... 64
18 Maintenance and service 64
18.1 Maintenance after a long stop period ........................................ 65
18.2 Maintenance before a long stop period ..................................... 65
18.3 About the refrigerant.................................................................. 65
18.4 After-sales service and warranty ............................................... 65
18.4.1 Warranty period .......................................................... 65
18.4.2 Recommended maintenance and inspection.............. 65
18.4.3 Recommended maintenance and inspection cycles... 66
18.4.4 Shortened maintenance and replacement cycles ....... 66
19 Troubleshooting 66
19.1 Error codes: Overview ................................................................ 67
19.2 Symptoms that are NOT system malfunctions ........................... 68
19.2.1 Symptom: The system does not operate ..................... 68
19.2.2 Symptom: Cool/Heat cannot be changed over ............ 68
19.2.3 Symptom: Fan operation is possible, but cooling and
heating do not work...................................................... 68
19.2.4 Symptom: The fan speed does not correspond to the
setting .......................................................................... 68
19.2.5 Symptom: The fan direction does not correspond to
the setting .................................................................... 68
19.2.6 Symptom: White mist comes out of a unit (Indoor
unit) .............................................................................. 68
19.2.7 Symptom: White mist comes out of a unit (Indoor
unit, outdoor unit) ......................................................... 68
19.2.8 Symptom: The user interface display reads "U4" or
"U5" and stops, but then restarts after a few minutes.. 68
19.2.9 Symptom: Noise of air conditioners (Indoor unit)......... 68
19.2.10 Symptom: Noise of air conditioners (Indoor unit,
outdoor unit)................................................................. 68
19.2.11 Symptom: Noise of air conditioners (Outdoor unit) ...... 68
19.2.12 Symptom: Dust comes out of the unit .......................... 68
19.2.13 Symptom: The units can give off odours...................... 68
19.2.14 Symptom: The outdoor unit fan does not spin ............. 68
19.2.15 Symptom: The display shows "88"............................... 69
19.2.16 Symptom: The compressor in the outdoor unit does
not stop after a short heating operation ....................... 69
19.2.17 Symptom: The inside of an outdoor unit is warm
even when the unit has stopped .................................. 69
19.2.18 Symptom: Hot air can be felt when the indoor unit is
stopped ........................................................................ 69
20 Relocation 69
21 Disposal 69
22 Technical data 69
22.1 Information requirements for Eco Design ................................... 69
23 Glossary 69
1 General safety precautions
1.1 About the documentation
▪ The original documentation is written in English. All other
languages are translations.
▪ The precautions described in this document cover very important
topics, follow them carefully.
▪ The installation of the system, and all activities described in the
installation manual and the installer reference guide MUST be
performed by an authorised installer.
1.1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING
Indicates a situation that could result in burning because of
extreme hot or cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.

1 General safety precautions
Installer and user reference guide
4
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
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.
Symbol Explanation
Before installation, read the installation and
operation manual, and the wiring instruction sheet.
Before performing maintenance and service tasks,
read the service manual.
For more information, see the installer and user
reference guide.
1.2 For the user
▪ If you are NOT sure how to operate the unit, contact your installer.
▪ This appliance can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in
a safe way and understand the hazards involved. Children shall
NOT play with the appliance. Cleaning and user maintenance
shall NOT be made by children without supervision.
WARNING
To prevent electric 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.
NOTICE
▪ Do NOT place any objects or equipment on top of the
unit.
▪ Do NOT sit, climb or stand on the unit.
▪ 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.
1.3 For the installer
1.3.1 General
If you are NOT sure how to install or operate the unit, contact your
dealer.
NOTICE
Improper installation or attachment of equipment or
accessories could result in electric 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.
DANGER: RISK OF BURNING
▪ 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
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.
NOTICE
▪ 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.

1 General safety precautions
Installer and user reference guide
5
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
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.
1.3.2 Installation site
▪ Provide sufficient space around the unit for servicing and air
circulation.
▪ Make sure the installation site withstands the unit's weight and
vibration.
▪ 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.
1.3.3 Refrigerant
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.
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 may 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.
▪ In case re-charge is required, refer to the nameplate of the unit. It
states the type of refrigerant and necessary amount.
▪ The unit is factory charged with refrigerant and depending on pipe
sizes and pipe lengths some systems require additional charging
of refrigerant.
▪ Only use tools exclusively for the refrigerant type used in the
system, this to ensure pressure resistance and prevent foreign
materials from entering into the system.
▪ Charge the liquid refrigerant as follows:
If Then
A siphon tube is present
(i.e., the cylinder is marked with
"Liquid filling siphon attached")
Charge with the cylinder upright.
A siphon tube is NOT present Charge with the cylinder upside
down.
▪ Open refrigerant cylinders slowly.
▪ Charge the refrigerant in liquid form. Adding it in gas form may
prevent normal operation.

1 General safety precautions
Installer and user reference guide
6
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
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.
1.3.4 Brine
If applicable. See the installation manual or installer reference guide
of your application for more information.
WARNING
The selection of the brine MUST be in accordance with the
applicable legislation.
WARNING
Take sufficient precautions in case of brine leakage. If
brine leaks, ventilate the area immediately and contact
your local dealer.
WARNING
The ambient temperature inside the unit can get much
higher than that of the room, e.g. 70°C. In case of a brine
leak, hot parts inside the unit can create a hazardous
situation.
WARNING
The use and installation of the application MUST comply
with the safety and environmental precautions specified in
the applicable legislation.
1.3.5 Water
If applicable. See the installation manual or installer reference guide
of your application for more information.
NOTICE
Make sure water quality complies with EU directive
98/83EC.
1.3.6 Electrical
DANGER: RISK OF ELECTROCUTION
▪ Turn OFF all power supply before removing the
switch box cover, connecting electrical wiring or
touching electrical parts.
▪ Disconnect the power supply for more than 1 minute,
and measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing.
The voltage MUST be less than 50 V DC before you
can touch electrical components. For the location of the
terminals, see the wiring diagram.
▪ Do NOT touch electrical components with wet hands.
▪ Do NOT leave the unit unattended when the service
cover is removed.
WARNING
If NOT factory installed, a main switch or other means for
disconnection, having a contact separation in all poles
providing full disconnection under overvoltage category III
condition, MUST be installed in the fixed wiring.
WARNING
▪ ONLY use copper wires.
▪ Make sure the field wiring complies with the applicable
legislation.
▪ All field wiring MUST be performed in accordance with
the wiring diagram supplied with the product.
▪ NEVER squeeze bundled cables and make sure they
do NOT come in contact with the piping and sharp
edges. Make sure no external pressure is applied to the
terminal connections.
▪ Make sure to install earth wiring. Do NOT earth the unit
to a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
▪ Make sure to use a dedicated power circuit. NEVER
use a power supply shared by another appliance.
▪ Make sure to install the required fuses or circuit
breakers.
▪ Make sure to install an earth leakage protector. Failure
to do so may cause electric 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, the earth connection
must be made before the current-carrying connections are
established. When disconnecting the power supply, the
current-carrying connections must be separated before the
earth connection is. 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metre away from televisions or radios
to prevent interference. Depending on the radio waves, a distance of
1metre may not be sufficient.

2 About the documentation
Installer and user reference guide
7
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
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.
2 About the documentation
2.1 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 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
extranet (authentication required).
For the installer
3 About the box
3.1 Overview: About the box
This chapter describes what you have to do after the box with the
outdoor unit is delivered on-site.
It contains information about:
▪ Unpacking and handling the outdoor unit
▪ Removing the accessories from the unit
▪ Removing the transportation stay
Keep the following in mind:
▪ At delivery, the unit MUST be checked for damage. Any damage
MUST be reported immediately to the carrier's claims agent.
▪ Bring the packed unit as close as possible to its final installation
position to prevent damage during transport.
▪ When handling the unit, take into account the following:
Fragile, handle the unit with care.
Keep the unit upright in order to avoid compressor
damage.
▪ Prepare the path along which you want to bring the unit inside in
advance.
▪ Lift the unit preferably with a crane and 2 belts of at least 8m long
as shown in the figure below. Always use protectors to prevent
belt damage and pay attention to the position of the unit's centre
of gravity.
d
d
b
b
d
c
a
c
aPackaging material
bBelt sling
cOpening
dProtector
NOTICE
Use a belt sling of ≤20mm wide that adequately bears the
weight of the unit.
▪ A forklift can only be used for transport as long as the unit remains
on its pallet as shown above.
3.2 To unpack the outdoor unit
Remove the packaging material from the unit:

3 About the box
Installer and user reference guide
8
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
▪ Take care not to damage the unit when removing the shrink foil
with a cutter.
▪ Remove the 4 bolts fixing the unit to its pallet.
WARNING
Tear apart and throw away plastic packaging bags so that
nobody, especially children, can play with them. Possible
risk: suffocation.
8~12 HP
14~20 HP
3.3 To remove the accessories from
the outdoor unit
14~20 HP8~12 HP
Make sure that all accessories are available in the unit.
a d
1× 1× e1×
3P328191-1
BESURE TO FILL OUTTHE BLANKS, WH ICHARE NEEDED FOR AFTER-SALE SERVICES.
REQUESTFOR THE INDICATION OF INSTALLATIONINFORMATION
1.RECORD OF INDOOR UNIT MODELAND INSTALLATION SITE
2.RECORD FOR SETTINGS (CONTENTS SEE INSTALLATIONMANUAL)
SETTING
40
30
10
2019
9
29
3938
28
8
1817
7
27
3736
26
6
1615
5
25
3534
23 24
4321
INSTALLATION
MODELNAME
No.
12 13 14
504948474645
6059585756
64636261
11
2221
333231
44434241
5554535251
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
3.RECORDOF INSTALLATION DATE
6.AFTEREQUIPPING, PLEASE PUT IT ON THE BACK SIDE OF THE FRONT PLATE.
DAY MONTH YEAR 4. MODEL NAME 5.MANUFACTURINGNUMBER
VALUE REMARK DATE SETTING VALUE REMARK DATE
3P328192-1
3.FOR DETAILSCONCERNING PIPING SELECTION AND CALCULATION OR HOW TO OPERATE THE LEAK DETECTION FUNCTION, PLEASE REFERTO THE INSTALLATION MANUAL.
2.RECORD OF ADDITIONALREFRIGERANT CHARGE AMOUNT AND RESULT OF LEAK CHECK OPERATION
REQUESTFOR THE INDICATION OF ADDITIONALREFRIGERANT CHARGING AND LEAK DETECTION OPERATION RESULT
BESURE TO FILLOUT THE BLANKS, WHICH ARE NEEDED FOR AFTER-SALE SERVICES.
1.CALCULATIONOF ADDITIONAL REFRIGERANT CHARGING AMOUNT
4.AFTER FILLING INTHIS TABLE, PLEASE PUT IT ON THE SWITCH BOX COVER.
(m)x0.18(m)x0.37
kg
OUTDOOR
UNIT
(m)x0.26
(m)x0.12 (m) x 0.059 (m) x 0.022
ADDITIONALCHARGING
AMOUNT TOTALLENGTHOFLIQUID
PIPESIZEO22.2 x 0.37 TOTALLENGTHOFLIQUID PIPESIZEO19.1 x 0.26 TOTALLENGTHOF LIQUID PIPESIZEO15.9 x 0.18
TOTALLENGTHOFLIQUID
PIPESIZEO12.7 x 0.12 TOTALLENGTHOFLIQUID PIPESIZEO9.5 x 0.059 TOTALLENGTHOF LIQUID PIPESIZEO6.4 x 0.022
105%<CR< 130%
50%<CR< 105%
50%<CR< 70%
70%<CR< 85%
85%<CR< 105%
105%<CR< 130%
8HP
Totalindoorunit
capacityconnection
ratio(CR)
10-12HP14-16HP18-20HP
2.0
1.5
1.5
1.2 1.5
1
1
0.7 1.0
0.5
0.5
0.3 0.5
0
0
01.0
0.5
0.5
0.5 0.5
0
0
0
Totalindoorunitcapacity
whenpipinglength <30m
Totalindoorunitcapacity
whenpipinglength >30m
kg
1.3
1.1
0.9 RYYQ18-20
RYYQ14-16
RYYQ8~12
kg
ONLYFORRYYQ8~20MODELS
DATE
AMOUNT
CALCULATETHEADDITIONALREFRIGERANT CHARGINGAMOUNTBASED ONTHE FORMULA BELOW BEFORE CHARGING.
SHIPMENT(INDICATEDON THE MACHINE NAMEPLATE)AND THE ADDITIONAL AMOUNT SHOWNAS FOLLOWS :
WHENRE-CHARGINGTOTALAMOUNT OF REFRIGERANT , CHARGETHE TOTALOF THE AMOUNT CHARGED AT
RESULTLEAKCHECK
DATE
AMOUNT
RESULTLEAKCHECK
DATE
AMOUNT
RESULTLEAKCHECK
DATE
AMOUNT
RESULTLEAKCHECK
c1× b1×
f g1×1×
aGeneral safety precautions
bInstallation manual and operation manual
cAdditional refrigerant charge label
dInstallation information sticker
eFluorinated greenhouse gases label
fMultilingual fluorinated greenhouse gases label
gPiping accessory bag
3.4 Accessory pipes: Diameters
Accessory pipes (mm) HP Øa Øb
Gas pipe
▪ Front connection
ID Øa ID Øb
▪ Bottom connection
ID Øa
OD Øb
8 25.4 19.1
10 22.2
12 28.6
14
16
18
20
Liquid pipe
▪ Front connection
ID Øb
ID Øa
▪ Bottom connection
ID Øb
ID Øa
8 9.5
10
12 9.5 12.7
14 12.7
16
18 12.7 15.9
20
Equaliser pipe(a)
▪ Front connection
ID ØaID Øb
▪ Bottom connection
ID Øa
OD Øb
8 19.1
10
12 19.1 22.2
14
16
18 25.4 28.6
20
(a) Only for RYMQ models.
3.5 To remove the transportation stay
Only for 14~20 HP
NOTICE
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
The transportation stay installed over the compressor leg for
protecting the unit during transport must be removed. Proceed as
shown in the figure and procedure below.
1Slightly loosen the fixing nut (a).
2Remove the transportation stay (b) as shown in the figure
below.
3Tighten the fixing nut (a) again.
1
3 (12.3 N·m)
21
3 (12.3 N·m)
2a
b

4 About the units and options
Installer and user reference guide
9
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
4 About the units and options
4.1 Overview: About the units and
options
This chapter contains information about:
▪ Identification of the outdoor unit
▪ Where the outdoor unit fits in the system layout
▪ With which indoor units and options you can combine the outdoor
units
▪ Which outdoor units have to be used as standalone units, and
which outdoor units can be combined
4.2 Identification label: Outdoor unit
Location
14~20 HP8~12 HP
Model identification
Example: R Y Y Q 18 U7 Y1 B [*]
Code Explanation
R Outdoor air cooled
Y Y=Heat pump (continuous heating)
X=Heat pump (no continuous heating)
Y Y=Pair module only(a)
M=Multi module only
Q Refrigerant R410A
18 Capacity class
U7 Model series
Y1 Power supply
B European market
[*] Minor model change indication
(a) For RXYQ, there is no restriction on use as multi module.
4.3 About the outdoor unit
This installation manual concerns the VRV IV, full inverter driven,
heat pump system.
Model line up:
Model Description
RYYQ8~20(a) Single continuous heating model.
RYYQ22~54(a) Multi continuous heating model (consisting
of 2 or 3 RYMQ modules).
RXYQ8~20 Single non-continuous heating model.
RXYQ22~54 Multi non-continuous heating model
(consisting of 2 or 3 RXYQ modules).
(a) The RYYQ models provide continuous comfort during
defrost operation.
Depending on the type of outdoor unit which is chosen, some
functionality will or will not exist. It will be indicated throughout this
installation manual and brought to your attention. Certain features
have exclusive model rights.
These units are intended for outdoor installation and aimed for heat
pump applications including air to air and air to water applications.
These units have (in single use) heating capacities ranging from 25
to 63kW and cooling capacities rating from 22.4 to 56kW. In multi
combination the heating capacity can go up till 168 kW and in
cooling till 150kW.
The outdoor unit is designed to work in heating mode at ambient
temperatures from –20°CWB to 15.5°CWB and in cooling mode at
ambient temperatures from –5°CDB to 43°CDB.
U-series units cannot be combined with T-series units.
4.4 System layout
NOTICE
Design of the system must not be done at temperatures
below –15°C.
INFORMATION
Not all combinations of indoor units are allowed, for
guidance, see "4.5.2 Possible combinations of indoor
units"on page10.
g
c
g g hg g
c c cd
f
eb
ia
aVRV IV Heat pump outdoor unit
bRefrigerant piping
cVRV direct expansion (DX) indoor unit
dVRV LT Hydrobox (HXY080/125)
eBP box (required to connect Residential Air (RA) or Sky Air
(SA) direct expansion (DX) indoor units)
fResidential Air (RA) direct expansion (DX) indoor units)
gUser interface (dedicated depending on indoor unit type)
hUser interface (wireless, dedicated depending on indoor
unit type)
iCool/heat changeover remote control switch
4.5 Combining units and options
4.5.1 About combining units and options
NOTICE
To be sure your system setup (outdoor unit+indoor unit(s))
will work, you have to consult the latest technical
engineering data for VRV IV heat pump.
The VRV IV heat pump system can be combined with several types
of indoor units and is intended for R410A use only.
For an overview which units are available you can consult the
product catalogue for VRV IV.
An overview is given indicating the allowed combinations of indoor
units and outdoor units. Not all combinations are allowed. They are
subject to rules (combination between outdoor-indoor, single outdoor
unit use, multiple outdoor unit use, combinations between indoor
units, etc.) mentioned in the technical engineering data.

4 About the units and options
Installer and user reference guide
10
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
4.5.2 Possible combinations of indoor units
In general following type of indoor units can be connected to a VRV
IV heat pump system. The list is non-exhaustive and is depending
on both outdoor unit model and indoor unit model combinations.
▪ VRV direct expansion (DX) indoor units (air to air applications).
▪ SA/RA (Sky Air/Residential Air) direct expansion (DX) indoor units
(air to air applications). Further referred to as RADX indoor units.
▪ Hydrobox (air to water applications): HXY080/125 series only.
▪ AHU (air to air applications): EKEXV-kit+EKEQ-box are required,
depending on application.
▪ Aircurtain (air to air applications): CYQ/CAV (Biddle) series,
depending on application.
4.5.3 Possible combinations of outdoor units
Possible standalone outdoor units
Non-continuous heating Continuous heating
RXYQ8 RYYQ8
RXYQ10 RYYQ10
RXYQ12 RYYQ12
RXYQ14 RYYQ14
RXYQ16 RYYQ16
RXYQ18 RYYQ18
RXYQ20 RYYQ20
Possible standard combinations of outdoor units
INFORMATION
U-series units cannot share the same refrigerant circuit
with T-series units. However, electrically , U-series units
and T-series units can be connected via F1/F2.
▪ RXYQ22~54 consists of 2 or 3 RXYQ8~20 units.
▪ RYYQ22~54 consists of 2 or 3 RYMQ8~20 units.
▪ RYYQ8~20 units cannot be combined.
▪ RYMQ8~20 units cannot be used as standalone outdoor unit.
Non-continuous heating Continuous heating
RXYQ22 = RXYQ10 + 12 RYYQ22 = RYMQ10 + 12
RXYQ24 = RXYQ8 + 16 RYYQ24 = RYMQ8 + 16
RXYQ26 = RXYQ12 + 14 RYYQ26 = RYMQ12 + 14
RXYQ28 = RXYQ12 + 16 RYYQ28 = RYMQ12 + 16
RXYQ30 = RXYQ12 + 18 RYYQ30 = RYMQ12 + 18
RXYQ32 = RXYQ16 + 16 RYYQ32 = RYMQ16 + 16
RXYQ34 = RXYQ16 + 18 RYYQ34 = RYMQ16 + 18
RXYQ36 = RXYQ16 + 20 RYYQ36 = RYMQ16 + 20
RXYQ38 = RXYQ8 + 10 + 20 RYYQ38 = RYMQ8 + 10 + 20
RXYQ40 = RXYQ10 + 12 + 18 RYYQ40 = RYMQ10 + 12 + 18
RXYQ42 = RXYQ10 + 16 + 16 RYYQ42 = RYMQ10 + 16 + 16
RXYQ44 = RXYQ12 + 16 + 16 RYYQ44 = RYMQ12 + 16 + 16
RXYQ46 = RXYQ14 + 16 + 16 RYYQ46 = RYMQ14 + 16 + 16
RXYQ48 = RXYQ16 + 16 + 16 RYYQ48 = RYMQ16 + 16 + 16
RXYQ50 = RXYQ16 + 16 + 18 RYYQ50 = RYMQ16 + 16 + 18
RXYQ52 = RXYQ16 + 18 + 18 RYYQ52 = RYMQ16 + 18 + 18
RXYQ54 = RXYQ18 + 18 + 18 RYYQ54 = RYMQ18 + 18 + 18
4.5.4 Possible options for the outdoor unit
INFORMATION
Refer to the technical engineering data for the latest option
names.
Refrigerant branching kit
Description Model name
Refnet header KHRQ22M29H
KHRQ22M64H
KHRQ22M75H
Refnet joint KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
For the selection of the optimal branching kit, please refer to
"5.3.3To select refrigerant branch kits"on page15.
Outdoor multi connection piping kit
Number of outdoor units Model name
2 BHFQ22P1007
3 BHFQ22P1517
Cool/heat selector
In order to control the cooling or heating operation from a central
location, the following option can be connected:
Description Model name
Cool/heat changeover switch KRC19-26A
Cool/heat changeover PCB BRP2A81
With optional fixing box for the
switch
KJB111A
External control adaptor (DTA104A61/62)
To instruct specific operation with an external input coming from a
central control the external control adaptor can be used. Instructions
(group or individual) can be instructed for low noise operation and
power consumption limitation operation.
PC configurator cable (EKPCCAB)
You can make several commissioning field settings through a
personal computer interface. For this option EKPCCAB is required
which is a dedicated cable to communicate with the outdoor unit.
The user interface software is available on http://
www.daikineurope.com/support-and-manuals/software-downloads/.
Heater tape kit
To keep the drain holes free in cold climates with high humidity, you
can install a heater tape kit. If you do so, you also have to install the
heater tape PCB kit.
Description Model name
Heater tape kit for 8~12 HP EKBPH012TA
Heater tape kit for 14~20 HP EKBPH020TA
See also: "5.2.2 Additional installation site requirements of the
outdoor unit in cold climates"on page12.
Demand PCB (EKRP1AHTA)
To enable the power saving consumption control by digital inputs
you must install the demand PCB.
For installation instructions, see the installation manual of the
demand PCB and addendum book for optional equipment.

5 Preparation
Installer and user reference guide
11
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
5 Preparation
5.1 Overview: Preparation
This chapter describes what you have to do and know before going
on-site.
It contains information about:
▪ Preparing the installation site
▪ Preparing the refrigerant piping
▪ Preparing the electrical wiring
5.2 Preparing the installation site
5.2.1 Installation site requirements of the
outdoor unit
▪ Provide sufficient space around the unit for servicing and air
circulation.
▪ Make sure the installation site withstands the unit's weight and
vibration.
▪ Make sure the area is well ventilated. Do NOT block any
ventilation openings.
▪ Make sure the unit is level.
▪ Select a place where rain can be avoided as much as possible.
▪ Select the location of the unit in such a way that the sound
generated by the unit does not disturb anyone, and the location is
selected according the applicable legislation.
Do NOT install the unit in the following places:
▪ In potentially explosive atmospheres.
▪ In places where there is machinery that emits electromagnetic
waves. Electromagnetic waves may disturb the control system,
and cause malfunction of the equipment.
▪ In places where there is a risk of fire due to the leakage of
flammable gases (example: thinner or gasoline), carbon fibre,
ignitable dust.
▪ In places where corrosive gas (example: sulphurous acid gas) is
produced. Corrosion of copper pipes or soldered parts may cause
the refrigerant to leak.
▪ In places where a mineral oil mist, spray or vapour may be
present in the atmosphere. Plastic parts may deteriorate and fall
off or cause water leakage.
NOTICE
This is a class A product. In a domestic environment this
product may cause radio interference in which case the
user may be required to take adequate measures.
NOTICE
The equipment described in this manual may cause
electronic noise generated from radio-frequency energy.
The equipment complies to specifications that are
designed to provide reasonable protection against such
interference. However, there is no guarantee that
interference will not occur in a particular installation.
It is therefore recommended to install the equipment and
electric wires keeping proper distances away from stereo
equipment, personal computers, etc.
b
ba a
c
df e
(mm)
≥
1500
≥
1500
≥
1500
≥
1000
≥
1000
≥
1000
≥
1000
≥
1000
≥
1000
e
aPersonal computer or radio
bFuse
cEarth leakage protector
dUser interface
eIndoor unit
fOutdoor unit
In places with weak reception, keep distances of 3 m or more to
avoid electromagnetic disturbance of other equipment and use
conduit tubes for power and transmission lines.
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.
▪ When installing, take strong winds, typhoons or earthquakes into
account, improper installation may result in the unit turning over.
▪ Take care that in the event of a water leak, water cannot cause
any damage to the installation space and surroundings.
▪ When installing the unit in a small room, take measures in order to
keep the refrigerant concentration from exceeding allowable
safety limits in the event of a refrigerant leak, refer to "About
safety against refrigerant leaks"on page12.
CAUTION
Excessive refrigerant concentrations in a closed room can
lead to oxygen deficiency.
▪ Be sure that the air inlet of the unit is not positioned towards the
main wind direction. Frontal wind will disturb the operation of the
unit. If necessary, use a screen to block the wind.
▪ Ensure that water cannot cause any damage to the location by
adding water drains to the foundation and prevent water traps in
the construction.
Seaside installation. Make sure the outdoor unit is NOT directly
exposed to sea winds. This is to prevent corrosion caused by high
levels of salt in the air, which might shorten the life of the unit.
Install the outdoor unit away from direct sea winds.
Example: Behind the building.
b
c
a

5 Preparation
Installer and user reference guide
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RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
If the outdoor unit is exposed to direct sea winds, install a
windbreaker.
▪ Height of windbreaker≥1.5×height of outdoor unit
▪ Mind the service space requirements when installing the
windbreaker.
a
b
c
d
c
d
aSea wind
bBuilding
cOutdoor unit
dWindbreaker
▪ All piping lengths and distances have been taken into
consideration (see "5.3.4About the piping length"on page15).
5.2.2 Additional installation site requirements
of the outdoor unit in cold climates
NOTICE
When operating the unit in a low outdoor ambient
temperature, be sure to follow the instructions described
below.
▪ To prevent exposure to wind and snow, install a baffle plate on the
air side of the outdoor unit:
In heavy snowfall areas it is very important to select an installation
site where the snow will NOT affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is NOT affected by
the snow. If necessary, install a snow cover or shed and a pedestal.
INFORMATION
For instructions on how to install the snow cover, contact
your dealer.
NOTICE
When installing the snow cover, do NOT obstruct the air
flow of the unit.
NOTICE
When operating the unit in a low outdoor ambient
temperature with high humidity conditions, make sure to
take precautions to keep the drain holes of the unit free by
using proper equipment.
In heating:
TAO (°C WB)
a b
20
15.5
15
10
5
0
–5
–10
–15
–20
10 15 20 2527 30
TAI (°C DB)
a Warming up operation range
b Operation range
TAI Ambient indoor temperature
TAO Ambient outdoor temperature
If the unit has to operate for 5 days in this area with
high humidity (>90%), Daikin recommends to install the
optional heater tape kit (EKBPH012TA or EKBPH020TA)
to keep the drain holes free.
5.2.3 Securing safety against refrigerant leaks
About safety against refrigerant leaks
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.
This system uses R410A as refrigerant. R410A itself is an entirely
safe non-toxic, non-combustible refrigerant. Nevertheless care must
be taken to ensure that the system is installed in a room which is
sufficiently large. This assures that the maximum concentration level
of refrigerant gas is not exceeded, in the unlikely event of major leak
in the system and this in accordance to the local applicable
regulations and standards.
About the maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is kg/m3 (the weight in
kg of the refrigerant gas in 1m3 volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
According to the appropriate European Standard, the maximum
allowed concentration level of refrigerant to a humanly space for
R410A is limited to 0.44kg/m3.

5 Preparation
Installer and user reference guide
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RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
b
a
aDirection of the refrigerant flow
bRoom where refrigerant leak has occurred (outflow of all
the refrigerant from the system)
Pay special attention to places, such as basements etc., where
refrigerant can stay, since refrigerant is heavier than air.
To check the maximum concentration level
Check the maximum concentration level in accordance with steps 1
to 4 below and take whatever action is necessary to comply.
1Calculate the amount of refrigerant (kg) charged to each system
separately.
Formula A+B=C
A Amount of refrigerant in a single unit system
(amount of refrigerant with which the system
is charged before leaving the factory)
B Additional charging amount (amount of
refrigerant added locally)
C Total amount of refrigerant (kg) in the
system
NOTICE
Where a single refrigerant facility is divided into 2 entirely
independent refrigerant systems, use the amount of
refrigerant with which each separate system is charged.
2Calculate the volume of the room (m3) where the indoor unit is
installed. In a case such as the following, calculate the volume
of (D), (E) as a single room or as the smallest room.
D When there are no smaller room divisions:
E When there is a room division that has an opening
sufficiently large to permit free air flow.
ab
a Opening between the rooms. In case there is a door
the openings above and below the door each must be
equivalent in size to 0.15% or more of the floor area.
b Room division
3Calculate the refrigerant density using the results of the
calculations in steps 1 and 2 above. If the result of the above
calculation exceeds the maximum concentration level, a
ventilation opening to the adjacent room shall be made.
Formula F/G≤H
F Total volume of refrigerant in the refrigerant
system
G Size (m3) of smallest room in which there is
an indoor unit installed
H Maximum concentration level (kg/m3)
4Calculate the refrigerant density taking the volume of the room
where the indoor unit is installed and the adjacent room. Install
ventilation openings in the door of adjacent rooms until the
refrigerant density is smaller than the maximum concentration
level.
5.3 Preparing refrigerant piping
5.3.1 Refrigerant piping requirements
NOTICE
The refrigerant R410A requires strict cautions for keeping
the system clean, dry and tight.
▪ Clean and dry: foreign materials (including mineral oils
or moisture) should be prevented from getting mixed
into the system.
▪ Tight: R410A does not contain any chlorine, does not
destroy the ozone layer, and does not reduce earth's
protection against harmful ultraviolet radiation. R410A
can contribute to the greenhouse effect if it is released.
Therefore pay special attention to check the tightness
of the installation.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Only use phosphoric acid deoxidised seamless copper.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30mg/10m.
▪ Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
Pipe Ø Temper grade of piping material
≤15.9mm O (annealed)
≥19.1mm 1/2H (half hard)
▪ All piping lengths and distances have been taken into
consideration (see "5.3.4About the piping length"on page15).
5.3.2 To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).
AB B B
C
D F
G
E
xy
b
a
3
1 2 4 5
1,2 VRVDX indoor unit

5 Preparation
Installer and user reference guide
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RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
3BP box
4,5 RADX indoor unit
a,b Indoor branch kit
x,y Outdoor multi connection kit
A, B, C: Piping between outdoor unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Gas pipe Liquid pipe
8 19.1 9.5
10 22.2 9.5
12~16 28.6 12.7
18~22 28.6 15.9
24 34.9 15.9
26~34 34.9 19.1
36~54 41.3 19.1
D: Piping between refrigerant branch kits
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe Liquid pipe
<150 15.9 9.5
150≤x<200 19.1
200≤x<290 22.2
290≤x<420 28.6 12.7
420≤x<640 15.9
640≤x<920 34.9 19.1
≥920 41.3
Example:
▪ Downstream capacity for E=capacity index of unit 1
▪ Downstream capacity for D=capacity index of unit 1+capacity
index of unit 2
E: Piping between refrigerant branch kit and
indoor unit
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit (in case indoor unit is VRVDX
indoor or Hydrobox).
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe Liquid pipe
15~50 12.7 6.4
63~140 15.9 9.5
200 19.1
250 22.2
▪ When the equivalent pipe length between outdoor and indoor
units is 90 m or more, the size of the main pipes (both gas side
and liquid side) must be increased. Depending on the length of the
piping, the capacity may drop, but even in such a case the size of
the main pipes has to be increased. More specifications can be
found in the technical engineering data book.
ae
bc
d
aOutdoor unit
bMain pipes
cIncrease if the equivalent piping length is ≥90m
dFirst refrigerant branch kit
eIndoor unit
Size up
HP class Piping outer diameter size (mm)
Gas pipe Liquid pipe
8 19.1 → 22.2 9.5 → 12.7
10 22.2 → 25.4(a)
12+14 28.6(b) 12.7 → 15.9
16 28.6 → 31.8(a)
18~22 15.9 → 19.1
24 34.9(b)
26~34 34.9 → 38.1(a) 19.1 → 22.2
36~54 41.3(b)
(a) If the size-up size is NOT available, you must use the
standard size. Sizes bigger than the size-up size are NOT
allowed. But even if you use the standard size, the
equivalent piping length is allowed to be more than 90m.
(b) Pipe size-up is NOT allowed.
▪ The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Pipe Ø (mm) Minimal thickness t (mm)
6.4/9.5/12.7 0.80
15.9 0.99
19.1/22.2 0.80
28.6 0.99
34.9 1.21
41.3 1.43
▪ In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch tomm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "6.7.3 To determine the additional refrigerant
amount"on page27.
F: Piping between refrigerant branch kit and BP
unit
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case RA DX indoor
units are connected).
Total capacity index
of connected indoor
units
Piping outer diameter size (mm)
Gas pipe Liquid pipe
20~62 12.7 6.4
63~149 15.9 9.5
150~208 19.1
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index
of unit 5]

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VRV IV+ heat pump
4P546228-1 – 2018.09
G: Piping between BP unit and RA DX indoor unit
Only in case RADX indoor units are connected.
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe Liquid pipe
20, 25, 30 9.5 6.4
50 12.7
60 9.5
71 15.9
5.3.3 To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to "5.3.2 To select the piping size" on
page13.
▪ When using refnet joints at the first branch counted from the
outdoor unit side, choose from the following table in accordance
with the capacity of the outdoor unit (example: refnet joint a).
Outdoor unit capacity type
(HP)
2 pipes
8~10 KHRQ22M29T9
12~22 KHRQ22M64T
24~54 KHRQ22M75T
▪ For refnet joints other than the first branch (example refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Indoor unit capacity index 2 pipes
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<640 KHRQ22M64T
≥640 KHRQ22M75T
▪ Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index 2 pipes
<200 KHRQ22M29H
200≤x<290
290≤x<640 KHRQ22M64H(a)
≥640 KHRQ22M75H
(a) If the pipe size above the refnet header is Ø34.9 or more,
KHRQ22M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose
from the following table in accordance with the number of outdoor
units.
Number of outdoor units Branch kit name
2 BHFQ22P1007
3 BHFQ22P1517
The RYYQ22~54 models, consisting of two or three RYMQ modules,
require a 3-pipe system. There is an additional equalising pipe for
such modules (in addition to the conventional gas and liquid piping).
This equalising pipe does not exist for RYYQ8~20 or RXYQ8~54
units.
The equalising pipe connections for the different RYMQ modules are
mentioned in below table.
RYMQ Equalising pipe Ø (mm)
8 19.1
10~16 22.2
18~20 28.6
Deciding the equalising pipe diameter:
▪ In case of 3 multi units: the connection diameter of outdoor to T-
joint has to be kept.
▪ In case of 2 multi units: the connection pipe has to have the
largest diameter.
There is never a connection of the equalising pipe with the indoor
units.
Example: (free multi combination)
RYMQ8+RYMQ12+RYMQ18. Largest connection is Ø28.6
(RYMQ18); Ø22.2 (RYMQ12) and Ø19.1 (RYMQ8). In figure below
only equalising pipe is shown.
Ø22.2 mm
Ø28.6 mm Ø19.1 mm
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
5.3.4 About the piping length
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated below. Three patterns
will be discussed, including VRV DX indoor units combined with
Hydrobox units or RADX indoor units.
Definitions
Term Definition
Actual piping length Pipe length between outdoor(a) and indoor
units.
Equivalent piping
length(b)
Pipe length between outdoor(a) and indoor
units.
Total piping length Total piping length from the outdoor(a) to all
indoor units.
H1 Difference in height between outdoor and
indoor units.
H2 Difference in height between indoor and
indoor units.
H3 Difference in height between outdoor and
outdoor units.
H4 Difference in height between outdoor and
BP unit.
H5 Difference in height between BP unit and
BP unit.
H6 Difference in height between BP unit and
RADX indoor unit.
(a) If the system capacity is a multi outdoor installation, re-read
"the first outdoor branch as seen from the indoor unit".
(b) Assume equivalent piping length of refnet joint=0.5m and
refnet header=1m (for calculation purposes of equivalent
piping length, not for refrigerant charge calculations).

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VRV IV+ heat pump
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5.3.5 Piping length: VRV DX only
For system only containing VRVDX indoor units:
System setup
Example Description
Example 1.1
a
A
h i j k l m n
B C D E F G p
b c d e f
1 2 3 4 5 6 7 8
gH1
H2
Single outdoor
Branch with refnet joint
Example 1.2
a
b
c d e f
i
k
j
g h
A B
1 2 3 4 5 6
7 8
H1 H2
Single outdoor
Branch with refnet joint
and refnet header
Example 1.3
a
c
b d e f i g h
1 2 3 4 5 6 7 8
H1
H2
Single outdoor
Branch with refnet
header
Example 2.1
a
A
h i j k l m n
B C D E F G p
b c d e f
1 2 3 4 5 6 7 8
g
t
u
rs
H1
H2
Multi outdoor
Branch with refnet joint
Example 2.2
a
j k
b
123456
7 8
c d e f g h
t
u
rs
BA H1
H3
H2
Multi outdoor
Branch with refnet joint
and refnet header
Example 2.3
a
b1234567 8 c d e f g h i
t
u
rs
H1
H3
H2
Multi outdoor
Branch with refnet
header
Example 3
r s
u
t
With standard multi
layout
Indoor unit
Refnet joint
Refnet header
Outdoor multi connection piping kit
Maximum allowable length
▪ Between outdoor and indoor units (single/multi combinations)
Actual piping
length
165m/135m
Example 1.1
▪ unit8: a+b+c+d+e+f+g+p≤165m
Example 1.2
▪ unit6: a+b+h≤165m
▪ unit8: a+i+k≤165m
Example 1.3
▪ unit8: a+i≤165m
Example 2.1
▪ unit8: a+b+c+d+e+f+g+p≤135m
Equivalent length 190m/160m
Total piping
length
1000m/500m
Example 1.1
▪ a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤1000m
Example 2.1
▪ a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤500m
▪ Between outdoor branch and outdoor unit (only in case of a multi
outdoor installation)
Actual piping
length
10m
Example 3
▪ r, s, t≤10m; u≤5m
Equivalent length 13m
Maximum allowable height difference
H1 ≤50m (40m) (if outdoor is located below indoor units)
Conditional extension up till 90m is possible without
additional option kit:
▪ In case the outdoor location is higher than indoor:
extension is possible up till 90 m and following
2conditions must be fulfilled:
▪ Liquid piping size up (see table "Size up" in "E: Piping
between refrigerant branch kit and indoor unit" on
page14).
▪ Dedicated setting on outdoor unit is required (see [2‑49]
in "7.2.8Mode 2: Field settings"on page40).
▪ In case the outdoor location is lower than indoor:
extension is possible up till 90 m and following
6conditions must be fulfilled:
▪ 40~60m: minimum connection ratio connected: 80%.
▪ 60~65m: minimum connection ratio connected: 90%.
▪ 65~80m: minimum connection ratio connected: 100%.
▪ 80~90m: minimum connection ratio connected: 110%.
▪ Liquid piping size up (see table "Size up" in "E: Piping
between refrigerant branch kit and indoor unit" on
page14).
▪ Dedicated setting on outdoor unit is required (see [2‑35]
in "7.2.8Mode 2: Field settings"on page40).
H2 ≤30m
H3 ≤5m
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤40 m.
Example 1.1: unit 8: b+c+d+e+f+g+p≤40m
Example 1.2: unit 6: b+h≤40m, unit 8: i+k≤40m

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VRV IV+ heat pump
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Example 1.3: unit 8: i≤40m
However, extension is possible if all below conditions are met. In this
case limitation can be extended up to 90m.
a
A
h i j k l m n
B C D E F G p
b c d e f
1 2 3 4 5 6 7 8
g
H1
H2
1
2
3
1Outdoor units
2Refnet joints (A~G)
3Indoor unit (1~8)
Conditions:
aThe piping length between all indoor units to the nearest branch
kit is ≤40m.
Example: h, i, j … p≤40m
bIt is necessary to increase the pipe size of the gas and liquid
piping if the pipe length between the first branch kit and the
farthest indoor unit is over 40m.
If the increased pipe size is larger than the pipe size of the main
pipe, then the pipe size of the main pipe has to be increased as
well.
Increase the pipe size as follows:
9.5 → 12.7; 12.7 → 15.9; 15.9 → 19.1; 19.1 → 22.2; 22.2 →
25.4(a); 28.6 → 31.8(a); 34.9 → 38.1(a)
(a) If the size-up size is NOT available, you must use the
standard size. Sizes bigger than the size-up size are NOT
allowed. But even if you use the standard size, you can
increase the maximum allowable length after the first branch if
all other conditions are met.
Example: unit8: b+c+d+e+f+g+p≤90m and b+c+d+e+f
+g>40m; increase the pipe size of b, c, d, e, f, g.
cWhen the piping size is increased (stepb), the piping length
has to be counted as double (except for the main pipe and the
pipes that are not increased in pipe size).
The total piping length has to be within limitations (see table
above).
Example: a+b×2+c×2+d×2+e×2+f×2+g×2+h+i+j+k+l+m+n
+p≤1000m (500m).
dThe piping length difference between the nearest indoor unit
(from first branch) to the outdoor unit and the farthest indoor
unit to the outdoor unit is ≤40m.
Example: The farthest indoor unit 8. The nearest indoor unit 1
→ (a+b+c+d+e+f+g+p)–(a+h)≤40m.
5.3.6 Piping length: VRV DX and Hydrobox
For system containing VRVDX indoor units and Hydrobox:
System setup
Example Description
Example 1
a
A
h i j k l m n
B C D E F G p
b c d e f
1 2 3 4 5 6 7 8
gH1
H2
Branch with refnet joint
Example 2
a
b
c d e f
i
k
j
g h
A B
1 2 3 4 5 6
7 8
H1 H2
Branch with refnet joint
and refnet header
Example Description
Example 3
a
c
b d e f i g h
1 2 3 4 5 6 7 8
H1
H2
Branch with refnet
header
1~7 VRVDX indoor units
8Hydrobox unit (HXY080/125)
Maximum allowable length
Between outdoor and indoor units.
Actual piping
length
135m
Example 1:
▪ a+b+c+d+e+f+g+p≤135 m
▪ a+b+c+d+k≤135m
Example 2:
▪ a+i+k≤135m
▪ a+b+e≤135m
Example 3:
▪ a+i≤135m
▪ a+d≤135m
Equivalent length(a) 160m
Total piping length 300m
Example 3:
▪ a+b+c+d+e+f+g+h+i≤300m
(a) Assume equivalent piping length of refnet joint=0.5m and
refnet header=1m (for calculation purposes).
Maximum allowable height difference (on Hydrobox indoor unit)
H1 ≤50m (40m) (if outdoor is located below indoor units)
H2 ≤15m
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤40 m.
Example 1: unit 8: b+c+d+e+f+g+p≤40m
Example 2: unit 6: b+h≤40m, unit 8: i+k≤40m
Example 3: unit 8: i≤40m, unit 2: c≤40m
5.3.7 Piping length: VRV DX and RA DX
For system containing VRVDX indoor units and RADX indoor units:
System setup
H5
H4
a
c
fe
h
H1 BP1 6
ij
g
b d
A B
7
kl
BP2
5
4
321 H2 H6
Header
BP box
1~5 RADX indoor units

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6,7 VRVDX indoor units
Maximum allowable length
▪ Between outdoor unit and indoor unit.
Actual piping
length
100m
Example:
a+b+g+l≤100m
Equivalent length(a) 120m
Total piping length 250m
Example:
a+b+d+g+l+k+c+e+f+h+i+j≤250m
(a) Assume equivalent piping length of refnet joint=0.5m and
refnet header=1m (for calculation purposes).
▪ Between BP unit and indoor unit.
Indoor unit capacity index Pipe length
<60 2~15m
60 2~12m
71 2~8m
Remark: Minimum allowable length between outdoor unit and first
refrigerant branch kit>5m (the refrigerant noise from the outdoor unit
can be transmitted).
Example: a>5m
Maximum allowable height difference
H1 ≤50m (40m) (if outdoor is located below indoor units)
H2 ≤15m
H4 ≤40m
H5 ≤15m
H6 ≤5m
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤50m.
Example: b+g+l≤50m
If the piping length between the first branch and BP unit or VRVDX
indoor unit is over 20 m, it is necessary to increase the gas and
liquid piping size between the first branch and BP unit or VRV DX
indoor unit. If the piping diameter of the sized up piping exceeds the
diameter of the piping before the first branch kit, than the latter also
requires a liquid piping and gas piping size up.
5.3.8 Multiple outdoor units: Possible layouts
▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1
a
b
b
a
Pattern 2
b
a
a
b
a
b
b
a
a
aTo indoor unit
bPiping between outdoor units
XNot allowed (oil remains in piping)
OAllowed
▪ To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between outdoor
units as shown in the 4 correct possibilities of the figure below.
abbb
abbb
ab
a
bab
a
aa
≥200 mm
aTo indoor unit
bOil collects to the outmost outdoor unit when the system
stops
XNot allowed
OAllowed
▪ If the piping length between the outdoor units exceeds 2m, create
a rise of 200mm or more in the gas line within a length of 2 m
from the kit.
If Then
≤2m
a
b
≤2 m
>2m
a
≤2 m ≤2 m
≥200 mm ≥200 mm
b
>2 m >2 m
aTo indoor unit
bPiping between outdoor units

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VRV IV+ heat pump
4P546228-1 – 2018.09
NOTICE
There are restrictions on the refrigerant pipe connection
order between outdoor units during installation in case of a
multiple outdoor unit system. Install according to following
restrictions. The capacities of outdoor units A, B and C
must fulfill the following restriction conditions: A≥B≥C.
A B C
a b c
a To indoor units
b Outdoor unit multi connecting piping kit (first branch)
c Outdoor unit multi connecting piping kit (second branch)
5.4 Preparing electrical wiring
5.4.1 About preparing electrical wiring
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
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
The backup heater MUST have a dedicated power supply
and MUST be protected by the safety devices required by
the applicable legislation.
WARNING
ALWAYS use multicore cable for power supply cables.
5.4.2 About electrical compliance
This equipment complies with:
▪EN/IEC 61000‑3‑11 provided that the system impedance Zsys is
less than or equal to Zmax at the interface point between the user's
supply and the public system.
▪ EN/IEC 61000‑3‑11 = European/International Technical
Standard setting the limits for voltage changes, voltage
fluctuations and flicker in public low-voltage supply systems for
equipment with rated current ≤75A.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a system impedance Zsys less than or equal to Zmax.
▪EN/IEC 61000‑3‑12 provided that the short-circuit power Ssc is
greater than or equal to the minimum Ssc value at the interface
point between the user's supply and the public system.
▪ EN/IEC 61000‑3‑12 = European/International Technical
Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input
current >16A and ≤75A per phase.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a short-circuit power Ssc greater than or equal to the
minimum Ssc value.
Model Zmax(Ω) Minimum Ssc
value (kVA)
RYYQ8/RYMQ8/RXYQ8 — 4050
RYYQ10/RYMQ10/RXYQ10 — 5535
RYYQ12/RYMQ12/RXYQ12 — 6038
RYYQ14/RYMQ14/RXYQ14 — 6793
RYYQ16/RYMQ16/RXYQ16 — 7547
RYYQ18/RYMQ18/RXYQ18 — 8805
RYYQ20/RYMQ20/RXYQ20 — 9812
RYYQ22/RXYQ22 — 11573
RYYQ24/RXYQ24 — 11597
RYYQ26/RXYQ26 — 12831
RYYQ28/RXYQ28 — 13585
RYYQ30/RXYQ30 — 14843
RYYQ32/RXYQ32 — 15094
RYYQ34/RXYQ34 — 16352
RYYQ36/RXYQ36 — 17359
RYYQ38/RXYQ38 — 19397
RYYQ40/RXYQ40 — 20378
RYYQ42/RXYQ42 — 20629
RYYQ44/RXYQ44 — 21132
RYYQ46/RXYQ46 — 21887
RYYQ48/RXYQ48 — 22641
RYYQ50/RXYQ50 — 23899
RYYQ52/RXYQ52 — 25157
RYYQ54/RXYQ54 — 26415
INFORMATION
Multi units are standard combinations.
5.4.3 Safety device requirements
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.

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VRV IV+ heat pump
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For standard combinations
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
INFORMATION
Multi units are standard combinations.
Model Minimum
circuit
ampacity
Recommended
fuses
RYYQ8/RYMQ8/RXYQ8 16.1A 20A
RYYQ10/RYMQ10/RXYQ10 22.0A 25A
RYYQ12/RYMQ12/RXYQ12 24.0A 32A
RYYQ14/RYMQ14/RXYQ14 27.0A 32A
RYYQ16/RYMQ16/RXYQ16 31.0A 40A
RYYQ18/RYMQ18/RXYQ18 35.0A 40A
RYYQ20/RYMQ20/RXYQ20 39.0A 50A
RYYQ22/RXYQ22 46.0A 63A
RYYQ24/RXYQ24 46.0A 63A
RYYQ26/RXYQ26 51.0A 63A
RYYQ28/RXYQ28 55.0A 63A
RYYQ30/RXYQ30 59.0A 80A
RYYQ32/RXYQ32 62.0A 80A
RYYQ34/RXYQ34 66.0A 80A
RYYQ36/RXYQ36 70.0A 80A
RYYQ38/RXYQ38 76.0A 100A
RYYQ40/RXYQ40 81.0A 100A
RYYQ42/RXYQ42 84.0A 100A
RYYQ44/RXYQ44 86.0A 100A
RYYQ46/RXYQ46 89.0A 100A
RYYQ48/RXYQ48 93.0A 125A
RYYQ50/RXYQ50 97.0A 125A
RYYQ52/RXYQ52 101.0A 125A
RYYQ54/RXYQ54 105.0A 125A
For all models:
▪ Phase and frequency: 3N~50Hz
▪ Voltage: 380~415V
▪ Transmission line section: 0.75~1.25 mm2, maximum length is
1000 m. If the total transmission wiring exceeds these limits, it
may result in communication error.
For non-standard combinations
Calculate the recommended fuse capacity.
Formula Calculate, by adding the minimum circuit amps of each
used unit (according to the table above), multiply the
result by 1.1 and select the next higher recommended
fuse capacity.
Example Combining the RXYQ30 by using the RXYQ8,
RXYQ10, and RXYQ12.
▪ Minimum circuit ampacity of the RXYQ8=16.1A
▪ Minimum circuit ampacity of the RXYQ10=22.0A
▪ Minimum circuit ampacity of the RXYQ12=24.0A
Accordingly, the minimum circuit ampacity of the
RXYQ30=16.1+22.0+24.0=62.1A
Multiply the above result by 1.1 ⇒ (62.1A×1.1)=68.3A,
so the recommended fuse capacity would be 80A.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
6 Installation
6.1 Overview: Installation
This chapter describes what you have to do and know on-site to
install the system.
Typical workflow
Installation typically consists of the following stages:
1 Opening the units
2 Mounting the outdoor unit
3 Connecting the refrigerant piping
4 Checking the refrigerant piping
5 Insulating the refrigerant piping
6 Charging refrigerant
7 Connecting the electrical wiring
6.2 Opening the units
6.2.1 To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
To gain access to the unit, front plates need to be opened as follows:
14×14×
8~12 HP 14~20 HP
Once the front plates open, the electrical component box can be
accessed. See "6.2.2 To open the electrical component box of the
outdoor unit"on page20.
For service purposes, the pushbuttons on the main PCB need to be
accessed. To access these pushbuttons, the electrical component
box cover does not need to be opened. See "7.2.3 To access the
field setting components"on page38.
6.2.2 To open the electrical component box of
the outdoor unit
NOTICE
Do NOT apply excessive force when opening the
electronic component box cover. Excessive force can
deform the cover, resulting in entering of water to cause
equipment failure.