Daikin VRV IV W+ Series User guide

Installer and user reference guide
VRV IV water-cooled system air conditioner
RWEYQ8T9Y1B
RWEYQ10T9Y1B
RWEYQ12T9Y1B
RWEYQ14T9Y1B

Table of contents
Installer and user reference guide
2
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Table of contents
1 About the documentation 6
1.1 About this document ...................................................................................................................................................... 6
1.2 Meaning of warnings and symbols................................................................................................................................. 6
2 General safety precautions 8
2.1 For the installer............................................................................................................................................................... 8
2.1.1 General ........................................................................................................................................................... 8
2.1.2 Installation site ............................................................................................................................................... 9
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 9
2.1.4 Brine................................................................................................................................................................ 11
2.1.5 Water .............................................................................................................................................................. 11
2.1.6 Electrical ......................................................................................................................................................... 12
3 Specific installer safety instructions 14
For the user 16
4 User safety instructions 17
4.1 General............................................................................................................................................................................ 17
4.2 Instructions for safe operation ....................................................................................................................................... 18
5 About the system 21
5.1 System layout.................................................................................................................................................................. 21
6 User interface 23
7 Before operation 24
8 Operation 25
8.1 Operation range.............................................................................................................................................................. 25
8.2 Operating the system ..................................................................................................................................................... 25
8.2.1 About operating the system........................................................................................................................... 25
8.2.2 About cooling, heating, fan only, and automatic operation ......................................................................... 26
8.2.3 About the heating operation.......................................................................................................................... 26
8.2.4 To operate the system (WITHOUT cool/heat changeover remote control switch)...................................... 27
8.2.5 To operate the system (WITH cool/heat changeover remote control switch)............................................. 27
8.3 Using the dry program.................................................................................................................................................... 28
8.3.1 About the dry program................................................................................................................................... 28
8.3.2 To use the dry program (WITHOUT cool/heat changeover remote control switch) .................................... 28
8.3.3 To use the dry program (WITH cool/heat changeover remote control switch) ........................................... 29
8.4 Adjusting the air flow direction ...................................................................................................................................... 29
8.4.1 About the air flow flap.................................................................................................................................... 29
8.5 Setting the master user interface................................................................................................................................... 30
8.5.1 About setting the master user interface........................................................................................................ 30
8.5.2 To designate the master user interface (VRV DX and Hydrobox) ................................................................. 30
8.6 About control systems .................................................................................................................................................... 31
9 Energy saving and optimum operation 32
9.1 Available main operation methods ................................................................................................................................ 32
9.2 Available comfort settings .............................................................................................................................................. 33
10 Maintenance and service 34
10.1 Maintenance after a long stop period............................................................................................................................ 34
10.2 Maintenance before a long stop period......................................................................................................................... 35
10.3 About the refrigerant...................................................................................................................................................... 35
10.4 After-sales service and warranty .................................................................................................................................... 35
10.4.1 Warranty period ............................................................................................................................................. 35
10.4.2 Recommended maintenance and inspection................................................................................................ 36
10.4.3 Recommended maintenance and inspection cycles ..................................................................................... 36
10.4.4 Shortened maintenance and replacement cycles ......................................................................................... 37
11 Troubleshooting 38
11.1 Error codes: Overview .................................................................................................................................................... 39
11.2 Symptoms that are NOT system malfunctions............................................................................................................... 39
11.2.1 Symptom: The system does not operate....................................................................................................... 39
11.2.2 Symptom: Cool/Heat cannot be changed over ............................................................................................. 39

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VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
11.2.3 Symptom: Fan operation is possible, but cooling and heating do not work ................................................ 40
11.2.4 Symptom: The fan speed does not correspond to the setting...................................................................... 40
11.2.5 Symptom: The fan direction does not correspond to the setting................................................................. 40
11.2.6 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 40
11.2.7 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 40
11.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 40
11.2.9 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 40
11.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 41
11.2.11 Symptom: Noise of air conditioners (Outdoor unit)...................................................................................... 41
11.2.12 Symptom: Dust comes out of the unit........................................................................................................... 41
11.2.13 Symptom: The units can give off odours ....................................................................................................... 41
11.2.14 Symptom: The outdoor unit fan does not spin.............................................................................................. 41
11.2.15 Symptom: The display shows "88"................................................................................................................. 41
11.2.16 Symptom: The compressor in the outdoor unit does not stop after a short heating operation ................. 41
11.2.17 Symptom: The inside of an outdoor unit is warm even when the unit has stopped.................................... 42
11.2.18 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 42
12 Relocation 43
13 Disposal 44
14 Technical data 45
14.1 Information requirements for Eco Design...................................................................................................................... 45
For the installer 46
15 About the box 47
15.1 About LOOP BY DAIKIN ................................................................................................................................................... 47
15.2 Overview: About the box ................................................................................................................................................ 47
15.3 To unpack the outdoor unit............................................................................................................................................ 48
15.4 To remove the accessories from the outdoor unit ........................................................................................................ 49
15.5 Accessory pipes: Diameters ............................................................................................................................................ 49
15.6 To remove the transportation stay ................................................................................................................................ 50
16 About the units and options 51
16.1 Overview: About the units and options.......................................................................................................................... 51
16.2 Identification label: Outdoor unit................................................................................................................................... 51
16.3 About the outdoor unit................................................................................................................................................... 52
16.4 System layout.................................................................................................................................................................. 52
16.5 Combining units and options.......................................................................................................................................... 54
16.5.1 About combining units and options............................................................................................................... 54
16.5.2 Possible combinations of indoor units........................................................................................................... 54
16.5.3 Possible combinations of outdoor units ........................................................................................................ 54
16.5.4 Possible options for the outdoor unit............................................................................................................ 55
17 Unit installation 57
17.1 Preparing the installation site......................................................................................................................................... 57
17.1.1 Installation site requirements of the outdoor unit........................................................................................ 57
17.1.2 Securing safety against refrigerant leaks ....................................................................................................... 59
17.2 Opening the unit ............................................................................................................................................................. 60
17.2.1 About opening the units................................................................................................................................. 60
17.2.2 To open the outdoor unit............................................................................................................................... 61
17.2.3 To open the electrical component box of the outdoor unit ......................................................................... 61
17.3 Mounting the outdoor unit............................................................................................................................................. 62
17.3.1 To provide the installation structure ............................................................................................................. 62
18 Piping installation 63
18.1 Preparing refrigerant piping ........................................................................................................................................... 64
18.1.1 Refrigerant piping requirements.................................................................................................................... 64
18.1.2 Refrigerant piping insulation.......................................................................................................................... 65
18.1.3 To select the piping size ................................................................................................................................. 65
18.1.4 To select refrigerant branch kits .................................................................................................................... 68
18.1.5 About the piping length.................................................................................................................................. 69
18.1.6 Single outdoor units and standard multi-outdoor-unit combinations.......................................................... 71
18.1.7 Multiple outdoor units: Possible layouts ....................................................................................................... 76
18.2 Preparing water piping ................................................................................................................................................... 78
18.2.1 Water quality requirements........................................................................................................................... 78
18.2.2 Water circuit requirements............................................................................................................................ 78
18.2.3 Handling the brazed plate heat exchanger.................................................................................................... 80
18.2.4 About the water flow rate.............................................................................................................................. 81

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4P452191-1B – 2020.10
18.3 Connecting the refrigerant piping .................................................................................................................................. 83
18.3.1 About connecting the refrigerant piping ....................................................................................................... 83
18.3.2 Precautions when connecting the refrigerant piping.................................................................................... 83
18.3.3 To route the refrigerant piping ...................................................................................................................... 84
18.3.4 To connect the refrigerant piping to the outdoor unit ................................................................................. 84
18.3.5 To connect the multi connection piping kit................................................................................................... 85
18.3.6 To connect the refrigerant branching kit....................................................................................................... 86
18.3.7 To protect against contamination.................................................................................................................. 86
18.3.8 To braze the pipe end..................................................................................................................................... 86
18.3.9 Using the stop valve and service port............................................................................................................ 87
18.3.10 To remove the spun pipes.............................................................................................................................. 89
18.4 Checking the refrigerant piping ...................................................................................................................................... 91
18.4.1 About checking the refrigerant piping........................................................................................................... 91
18.4.2 Checking refrigerant piping: General guidelines ........................................................................................... 92
18.4.3 Checking refrigerant piping: Setup ................................................................................................................ 93
18.4.4 To perform a leak test .................................................................................................................................... 93
18.4.5 To perform vacuum drying............................................................................................................................. 94
18.4.6 To insulate the refrigerant piping .................................................................................................................. 95
18.5 Charging refrigerant........................................................................................................................................................ 95
18.5.1 Precautions when charging refrigerant ......................................................................................................... 95
18.5.2 About charging refrigerant............................................................................................................................. 96
18.5.3 To determine the additional refrigerant amount.......................................................................................... 96
18.5.4 To charge refrigerant...................................................................................................................................... 98
18.5.5 Checks after charging refrigerant .................................................................................................................. 100
18.5.6 To fix the fluorinated greenhouse gases label............................................................................................... 100
18.6 Connecting water piping................................................................................................................................................. 101
18.6.1 About connecting the water piping ............................................................................................................... 101
18.6.2 Precautions when connecting the water piping............................................................................................ 101
18.6.3 To connect the water piping .......................................................................................................................... 101
18.6.4 To fill the water circuit ................................................................................................................................... 102
18.6.5 To insulate the water piping .......................................................................................................................... 102
19 Electrical installation 103
19.1 About connecting the electrical wiring .......................................................................................................................... 103
19.1.1 Precautions when connecting the electrical wiring....................................................................................... 103
19.1.2 Field wiring: Overview .................................................................................................................................... 105
19.1.3 About the electrical wiring ............................................................................................................................. 105
19.1.4 About electrical compliance........................................................................................................................... 107
19.1.5 Safety device requirements ........................................................................................................................... 108
19.2 To route and fix the transmission wiring........................................................................................................................ 109
19.3 To connect the transmission wiring ............................................................................................................................... 109
19.4 To finish the transmission wiring.................................................................................................................................... 111
19.5 To route and fix the power supply ................................................................................................................................. 111
19.6 To connect the power supply ......................................................................................................................................... 112
19.7 To connect the optional wiring....................................................................................................................................... 113
19.8 To check the insulation resistance of the compressor .................................................................................................. 115
20 Configuration 116
20.1 Overview: Configuration................................................................................................................................................. 116
20.2 Making field settings....................................................................................................................................................... 116
20.2.1 About making field settings............................................................................................................................ 116
20.2.2 Field setting components............................................................................................................................... 117
20.2.3 To access the field setting components......................................................................................................... 118
20.2.4 To access mode 1 or 2.................................................................................................................................... 118
20.2.5 To use mode 1 ................................................................................................................................................ 119
20.2.6 To use mode 2 ................................................................................................................................................ 120
20.2.7 Mode 1: Monitoring settings ......................................................................................................................... 121
20.2.8 Mode 2: Field settings .................................................................................................................................... 122
20.2.9 To connect the PC configurator to the outdoor unit..................................................................................... 127
21 Commissioning 128
21.1 Overview: Commissioning .............................................................................................................................................. 128
21.2 Precautions when commissioning .................................................................................................................................. 128
21.3 Checklist before commissioning ..................................................................................................................................... 129
21.4 About the test run........................................................................................................................................................... 130
21.5 To perform a test run...................................................................................................................................................... 131
21.6 Correcting after abnormal completion of the test run .................................................................................................. 132
21.7 Operating the unit........................................................................................................................................................... 132
22 Maintenance and service 133
22.1 Maintenance safety precautions .................................................................................................................................... 133

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VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
22.1.1 To prevent electrical hazards ......................................................................................................................... 133
22.2 Maintenance of the plate heat exchanger ..................................................................................................................... 134
22.2.1 To clean the plate heat exchanger................................................................................................................. 134
22.3 About service mode operation ....................................................................................................................................... 135
22.3.1 To use vacuum mode ..................................................................................................................................... 135
22.3.2 To recover refrigerant .................................................................................................................................... 135
23 Troubleshooting 136
23.1 Solving problems based on error codes ......................................................................................................................... 136
24 Disposal 137
25 Technical data 138
25.1 Service space: Outdoor unit ........................................................................................................................................... 138
25.2 Piping diagram: Outdoor unit ......................................................................................................................................... 139
25.3 Wiring diagram: Outdoor unit ........................................................................................................................................ 140
26 Glossary 143

1 | About the documentation
Installer and user reference guide
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RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
1 About the documentation
In this chapter
1.1 About this document.............................................................................................................................................................. 6
1.2 Meaning of warnings and symbols......................................................................................................................................... 6
1.1 About this document
Target audience
Authorised installers + end users
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 Business Portal
(authentication required).
1.2 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.

1 | About the documentation
Installer and user reference guide
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VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
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".
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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VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
2 General safety precautions
In this chapter
2.1 For the installer....................................................................................................................................................................... 8
2.1.1 General ................................................................................................................................................................... 8
2.1.2 Installation site ....................................................................................................................................................... 9
2.1.3 Refrigerant — in case of R410A or R32 ................................................................................................................. 9
2.1.4 Brine ....................................................................................................................................................................... 11
2.1.5 Water...................................................................................................................................................................... 11
2.1.6 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.

2 | General safety precautions
Installer and user reference guide
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VRV IV water-cooled system air conditioner
4P452191-1B – 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
Installer and user reference guide
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VRV IV water-cooled system air conditioner
4P452191-1B – 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:

2 | General safety precautions
Installer and user reference guide
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VRV IV water-cooled system air conditioner
4P452191-1B – 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 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.
2.1.5 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.

2 | General safety precautions
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VRV IV water-cooled system air conditioner
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2.1.6 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 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.
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.

2 | General safety precautions
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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.
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 water-cooled system air conditioner
4P452191-1B – 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
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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.
WARNING
ALWAYS use multicore cable for power supply cables.
CAUTION
▪When connecting the power supply: connect the earth cable first, before making
the current-carrying connections.
▪When disconnecting the power supply: disconnect the current-carrying cables
first, before separating the earth connection.
▪The length of the conductors between the power supply stress relief and the
terminal block itself must be as such that the current-carrying wires are tautened
before the earth wire is in case the power supply is pulled loose from the stress
relief.
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
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For the user

4 | User safety instructions
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4 User safety instructions
Always observe the following safety instructions and regulations.
In this chapter
4.1 General.................................................................................................................................................................................... 17
4.2 Instructions for safe operation............................................................................................................................................... 18
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
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▪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.

4 | User safety instructions
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CAUTION
To avoid oxygen deficiency, ventilate the room sufficiently
if equipment with burner is used together with the system.
WARNING
This unit contains electrical and hot parts.
WARNING
Before operating the unit, be sure the installation has been
carried out correctly by an installer.
WARNING
Never touch the air outlet or the horizontal blades while
the swing flap is in operation. Fingers may become caught
or the unit may break down.
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.
CAUTION: Pay attention to the fan!
It is dangerous to inspect the unit while the fan is running.
Be sure to turn off the main switch before executing any
maintenance task.
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
WARNING
NEVER replace a fuse with a fuse of a wrong ampere
ratings or other wires when a fuse blows out. Use of wire
or copper wire may cause the unit to break down or cause
a fire.

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WARNING
▪Do NOT modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation
may cause an electric shock or fire. Contact your dealer.
▪In case of accidental refrigerant leaks, make sure there
are no naked flames. The refrigerant itself is entirely
safe, non-toxic and non-combustible, but it will generate
toxic gas when it accidentally leaks into a room where
combustible air from fan heaters, gas cookers, etc. is
present. Always have qualified service personnel
confirm that the point of leakage has been repaired or
corrected before resuming operation.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire. Contact your dealer.
WARNING
The refrigerant in the system is safe and normally does not
leak. If the refrigerant leaks in the room, contact with a fire
of a burner, a heater or a cooker may result in a harmful
gas.
Turn off any combustible heating devices, ventilate the
room and contact the dealer where you purchased the
unit.
Do not use the system until a service person confirms that
the portion where the refrigerant leaks is repaired.