Daikin LREN8A7Y1B User guide

Installer and user reference guide
CO₂ ZEAS outdoor unit and capacity up unit
LREN8A7Y1B
LREN10A7Y1B
LREN12A7Y1B
LRNUN5A7Y1

Table of contents
Installer and user reference guide
2
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Table of contents
1 About the documentation 5
1.1 About this document ...................................................................................................................................................... 5
2 General safety precautions 6
2.1 About the documentation .............................................................................................................................................. 6
2.1.1 Meaning of warnings and symbols ................................................................................................................ 6
2.2 For the installer............................................................................................................................................................... 7
2.2.1 General ........................................................................................................................................................... 7
2.2.2 Installation site ............................................................................................................................................... 8
2.2.3 Refrigerant — in case of R744........................................................................................................................ 10
2.2.4 Electrical ......................................................................................................................................................... 11
3 Specific installer safety instructions 13
For the user 22
4 User safety instructions 23
4.1 General............................................................................................................................................................................ 23
4.2 Instructions for safe operation ....................................................................................................................................... 24
5 About the system 29
5.1 System layout.................................................................................................................................................................. 30
6 Operation 31
6.1 Operation modes ............................................................................................................................................................ 31
6.2 Operation range.............................................................................................................................................................. 31
6.3 Field piping pressure....................................................................................................................................................... 31
7 Energy saving and optimum operation 32
8 Maintenance and service 33
8.1 Maintenance before a long stop period......................................................................................................................... 33
8.2 Maintenance after a long stop period............................................................................................................................ 33
8.3 About the refrigerant...................................................................................................................................................... 34
8.4 Recommended maintenance and inspection ................................................................................................................ 34
9 Troubleshooting 35
9.1 Error codes: Overview .................................................................................................................................................... 36
10 Relocation 38
11 Disposal 39
For the installer 40
12 About the box 41
12.1 Outdoor unit ................................................................................................................................................................... 41
12.1.1 To transport the pallet ................................................................................................................................... 41
12.1.2 To unpack the outdoor unit ........................................................................................................................... 42
12.1.3 To handle the outdoor unit............................................................................................................................ 42
12.1.4 To remove the accessories from the outdoor unit........................................................................................ 43
13 About the units and options 45
13.1 Identification ................................................................................................................................................................... 45
13.1.1 Identification label: Outdoor unit .................................................................................................................. 45
13.2 About the outdoor unit................................................................................................................................................... 46
13.2.1 Labels on outdoor unit ................................................................................................................................... 47
13.3 System layout.................................................................................................................................................................. 53
13.4 Combining units and options.......................................................................................................................................... 53
13.4.1 Possible options for the outdoor unit............................................................................................................ 53
13.5 Indoor unit constraints ................................................................................................................................................... 54
13.5.1 Constraints for refrigeration .......................................................................................................................... 54
14 Unit installation 56
14.1 Preparing the installation site......................................................................................................................................... 56
14.1.1 Installation site requirements of the outdoor unit........................................................................................ 57

Table of contents
Installer and user reference guide
3
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
14.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 60
14.1.3 Additional installation site requirements for CO₂ refrigerant ....................................................................... 60
14.2 Opening and closing the unit.......................................................................................................................................... 65
14.2.1 About opening the units................................................................................................................................. 65
14.2.2 To open the outdoor unit............................................................................................................................... 65
14.2.3 To open the electrical component box of the outdoor unit ......................................................................... 66
14.2.4 To close the outdoor unit............................................................................................................................... 67
14.3 Mounting the outdoor unit............................................................................................................................................. 68
14.3.1 About mounting the outdoor unit ................................................................................................................. 68
14.3.2 Precautions when mounting the outdoor unit.............................................................................................. 68
14.3.3 To provide the installation structure ............................................................................................................. 68
14.3.4 To install the outdoor unit ............................................................................................................................. 70
14.3.5 To remove the transportation stay................................................................................................................ 70
14.3.6 To provide drainage........................................................................................................................................ 71
15 Piping installation 72
15.1 Preparing refrigerant piping ........................................................................................................................................... 72
15.1.1 Refrigerant piping requirements.................................................................................................................... 72
15.1.2 Refrigerant piping material ............................................................................................................................ 73
15.1.3 Refrigerant piping length and height difference ........................................................................................... 73
15.1.4 To select the piping size ................................................................................................................................. 75
15.1.5 To select refrigerant branch kits .................................................................................................................... 77
15.1.6 To select expansion valves for refrigeration.................................................................................................. 77
15.2 Using stop valves and service ports................................................................................................................................ 78
15.2.1 Overview stop valves and service ports for connection and charging.......................................................... 79
15.2.2 Overview stop valves for maintenance.......................................................................................................... 79
15.2.3 To handle the stop valve ................................................................................................................................ 80
15.2.4 Tightening torques ......................................................................................................................................... 81
15.2.5 To handle the service port ............................................................................................................................. 81
15.3 Connecting the refrigerant piping .................................................................................................................................. 83
15.3.1 About connecting the refrigerant piping ....................................................................................................... 83
15.3.2 Precautions when connecting the refrigerant piping.................................................................................... 84
15.3.3 To cut off the spun pipe ends ........................................................................................................................ 85
15.3.4 To connect the refrigerant piping to the outdoor unit ................................................................................. 86
15.3.5 To braze the pipe end..................................................................................................................................... 89
15.3.6 Guidelines to connect T-joints ....................................................................................................................... 91
15.3.7 Guidelines to install a dryer............................................................................................................................ 92
15.3.8 Guidelines to install a filter............................................................................................................................. 92
15.3.9 About safety valves......................................................................................................................................... 93
15.3.10 Guidelines to install blow-off piping .............................................................................................................. 96
15.4 Checking the refrigerant piping ...................................................................................................................................... 96
15.4.1 About checking the refrigerant piping........................................................................................................... 97
15.4.2 Checking refrigerant piping: General guidelines ........................................................................................... 97
15.4.3 Checking refrigerant piping: Setup ................................................................................................................ 97
15.4.4 To perform a strength pressure test and leak test........................................................................................ 98
15.4.5 To perform vacuum drying............................................................................................................................. 98
15.5 Insulating the refrigerant piping..................................................................................................................................... 99
15.5.1 To insulate the gas stop valve ........................................................................................................................ 99
16 Electrical installation 101
16.1 About connecting the electrical wiring .......................................................................................................................... 101
16.1.1 Precautions when connecting the electrical wiring....................................................................................... 101
16.1.2 Guidelines when connecting the electrical wiring......................................................................................... 102
16.1.3 About electrical compliance........................................................................................................................... 104
16.2 Field wiring: Overview .................................................................................................................................................... 105
16.3 Guidelines when knocking out knockout holes.............................................................................................................. 106
16.4 Specifications of standard wiring components .............................................................................................................. 107
16.5 Connections to the outdoor unit.................................................................................................................................... 108
16.5.1 Low voltage wiring – Outdoor unit ................................................................................................................ 108
16.5.2 High voltage wiring – Outdoor unit................................................................................................................ 110
16.6 Connections to the capacity up unit............................................................................................................................... 112
16.6.1 Low voltage wiring – Capacity up unit ........................................................................................................... 112
16.6.2 High voltage wiring – Capacity up unit .......................................................................................................... 114
17 Charging refrigerant 116
17.1 About charging refrigerant ............................................................................................................................................. 116
17.2 Precautions when charging refrigerant.......................................................................................................................... 116
17.3 About the refrigerant...................................................................................................................................................... 117
17.4 To determine the refrigerant amount............................................................................................................................ 119
17.5 To charge refrigerant ...................................................................................................................................................... 120

Table of contents
Installer and user reference guide
4
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
17.6 To fix the refrigerant charge label .................................................................................................................................. 121
18 Finishing the outdoor unit installation 122
18.1 To check the insulation resistance of the compressor .................................................................................................. 122
19 Configuration 123
19.1 Making field settings....................................................................................................................................................... 123
19.1.1 About making field settings............................................................................................................................ 123
19.1.2 To access the field setting components......................................................................................................... 123
19.1.3 Field setting components............................................................................................................................... 124
19.1.4 To access mode 1 or 2.................................................................................................................................... 126
19.1.5 To set field settings......................................................................................................................................... 127
20 Commissioning 128
20.1 Overview: Commissioning .............................................................................................................................................. 128
20.2 Precautions when commissioning .................................................................................................................................. 128
20.3 Checklist before commissioning ..................................................................................................................................... 129
20.4 About the test run........................................................................................................................................................... 130
20.5 To perform a test run (7-segment display) .................................................................................................................... 130
20.5.1 Test run checks............................................................................................................................................... 131
20.5.2 Correcting after abnormal completion of the test run.................................................................................. 133
20.6 Operating the unit........................................................................................................................................................... 133
20.7 Logbook........................................................................................................................................................................... 133
21 Hand-over to the user 135
22 Maintenance and service 136
22.1 Precautions for maintenance and service...................................................................................................................... 136
22.2 To prevent electrical hazards ......................................................................................................................................... 136
22.3 To release refrigerant ..................................................................................................................................................... 137
22.3.1 To remove refrigerant using the service ports .............................................................................................. 137
23 Troubleshooting 139
23.1 Precautions when troubleshooting ................................................................................................................................ 139
23.2 Prerequisites: Troubleshooting ...................................................................................................................................... 139
23.3 Solving problems based on error codes ......................................................................................................................... 139
23.3.1 Error codes: Overview .................................................................................................................................... 140
24 Disposal 144
25 Technical data 145
25.1 Service space: Outdoor unit ........................................................................................................................................... 145
25.2 Piping diagram: Outdoor unit ......................................................................................................................................... 148
25.3 Piping diagram: Capacity up unit.................................................................................................................................... 149
25.4 Wiring diagram: Outdoor unit ........................................................................................................................................ 150
26 Glossary 155

1 | About the documentation
Installer and user reference guide
5
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
1 About the documentation
1.1 About this document
In this documentation, the term "indoor units" is used for refrigeration units,
unless mentioned otherwise.
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)
▪Installation and operation manual of the outdoor unit:
-Installation and operation instructions
-Format: Paper (in the box of the outdoor unit)
▪Installer and user reference guide of the outdoor unit:
-Preparation of the installation, reference data,…
-Detailed step-by-step instructions and background information for basic and
advanced usage
-Format: Digital files on https://www.daikin.eu. Use the search function to
find your model.
▪CO2 ZEAS heat recovery connection instruction:
-Preparation of the installation, reference data,…
-Format: Digital files on https://www.daikin.eu. Use the search function to
find your model.
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your dealer.
The original documentation is written in English. All other languages are
translations.
Technical engineering data
▪A subset of the latest technical data is available on the regional Daikin website
(publicly accessible).
▪The full set of latest technical data is available on the Daikin Business Portal
(authentication required).

2 | General safety precautions
Installer and user reference guide
6
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
2 General safety precautions
2.1 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 in the installer reference guide MUST be performed by an authorised
installer.
2.1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
NOTICE
Indicates a situation that could result in equipment or property damage.
INFORMATION
Indicates useful tips or additional information.
Symbols used on the unit:

2 | General safety precautions
Installer and user reference guide
7
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
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".
2.2 For the installer
2.2.1 General
If you are NOT sure how to install or operate the unit, contact your dealer.
DANGER: RISK OF BURNING/SCALDING
▪Do NOT touch the refrigerant piping, water piping or internal parts during and
immediately after operation. It could be too hot or too cold. Give it time to return
to normal temperature. If you MUST touch it, wear protective gloves.
▪Do NOT touch any accidental leaking refrigerant.
WARNING
Improper installation or attachment of equipment or accessories could result in
electrical shock, short-circuit, leaks, fire or other damage to the equipment. ONLY
use accessories, optional equipment and spare parts made or approved by Daikin
unless otherwise specified.
WARNING
Make sure installation, testing and applied materials comply with applicable
legislation (on top of the instructions described in the Daikin documentation).
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.
WARNING
Provide adequate measures to prevent that the unit can be used as a shelter by small
animals. Small animals that make contact with electrical parts can cause
malfunctions, smoke or fire.

2 | General safety precautions
Installer and user reference guide
8
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
CAUTION
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
CAUTION
Do NOT touch the air inlet or aluminium fins of the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the unit.
▪Do NOT sit, climb or stand on the unit.
NOTICE
Works executed on the outdoor unit are best done under dry weather conditions to
avoid water ingress.
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.
2.2.2 Installation site
▪Provide sufficient space around the unit for servicing and air circulation.
▪Make sure the installation site withstands the weight and vibration of the unit.
▪Make sure the area is well ventilated. Do NOT block any ventilation openings.
▪Make sure the unit is level.
Do NOT install the unit in the following places:
▪In potentially explosive atmospheres.
▪In places where there is machinery that emits electromagnetic waves.
Electromagnetic waves may disturb the control system, and cause malfunction of
the equipment.
▪In places where there is a risk of fire due to the leakage of flammable gases
(example: thinner or gasoline), carbon fibre, ignitable dust.
▪In places where corrosive gas (example: sulphurous acid gas) is produced.
Corrosion of copper pipes or soldered parts may cause the refrigerant to leak.
Instructions for equipment using R744 refrigerant
WARNING
▪Do NOT pierce or burn refrigerant cycle parts.
▪Be aware that the refrigerant inside the system is odourless.

2 | General safety precautions
Installer and user reference guide
9
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
The appliance shall be stored so as to prevent mechanical damage and in a well-
ventilated room without continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric heater) and have a room
size as specified below.
WARNING
Make sure installation, servicing, maintenance and repair comply with instructions
from Daikin and with applicable legislation and are executed ONLY by authorised
persons.
WARNING
If one or more rooms are connected to the unit using a duct system, make sure:
▪there are no operating ignition sources (example: open flames, an operating gas
appliance or an operating electric heater) in case the floor area is less than the
minimum floor area A (m²).
▪no auxiliary devices, which may be a potential ignition source, are installed in the
duct work (example: hot surfaces with a temperature exceeding 700°C and
electric switching device);
▪only auxiliary devices approved by the manufacturer are used in the duct work;
▪air inlet AND outlet are connected directly to the same room by ducting. Do NOT
use spaces such as a false ceiling as a duct for the air inlet or outlet.
NOTICE
▪Take precautions to avoid excessive vibration or pulsation to refrigeration piping.
▪Protect the protection devices, piping and fittings as much as possible against
adverse environmental effects.
▪Provide space for expansion and contraction of long runs of piping.
▪Design and install piping in refrigerating systems such as to minimise the
likelihood of hydraulic shock damaging the system.
▪Mount the indoor equipment and pipes securely and protect them to avoid
accidental rupture of equipment or pipes in case of events such as moving
furniture or reconstruction activities.
CAUTION
Do NOT use potential sources of ignition in searching for or detection of refrigerant
leaks.
NOTICE
▪Do NOT re-use joints and copper gaskets which have been used already.
▪Joints made in installation between parts of refrigerant system shall be accessible
for maintenance purposes.
Installation space requirements
NOTICE
▪Protect pipework from physical damage.
▪Keep the pipework installation to a minimum.

2 | General safety precautions
Installer and user reference guide
10
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
2.2.3 Refrigerant — in case of R744
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 pressurise the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).
WARNING
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,
ventilate the area immediately. Possible risks:
▪Carbon dioxide poisoning
▪Asphyxiation
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.
CAUTION
A vacuumed system will be under triple point. To avoid solid ice, ALWAYS start
charging with R744 in vapour state. When the triple point is reached (5.2 bar
absolute pressure or 4.2bar gauge pressure), you may continue charging with R744
in liquid state.
▪In case recharge is required, see the nameplate or the refrigerant charge label of
the unit. It states the type of refrigerant and necessary amount.
▪Either if the unit is factory charged with refrigerant or the unit is non-charged,
you might need to charge additional refrigerant, depending on the pipe sizes and
pipe lengths of the system.

2 | General safety precautions
Installer and user reference guide
11
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
▪Only use R744 (CO2) as refrigerant. Other substances may cause explosions and
accidents.
▪Do NOT charge liquid refrigerant directly from a gas line. Liquid compression
could cause compressor operation failure.
▪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.
▪Open refrigerant cylinders slowly.
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.
2.2.4 Electrical
DANGER: RISK OF ELECTROCUTION
▪Turn OFF all power supply before removing the switch box cover, connecting
electrical wiring or touching electrical parts.
▪Disconnect the power supply for more than 10minutes, and measure the voltage
at the terminals of main circuit capacitors or electrical components before
servicing. The voltage MUST be less than 50VDC before you can touch electrical
components. For the location of the terminals, see the wiring diagram.
▪Do NOT touch electrical components with wet hands.
▪Do NOT leave the unit unattended when the service cover is removed.
WARNING
If NOT factory installed, a main switch or other means for disconnection, having a
contact separation in all poles providing full disconnection under overvoltage
categoryIII condition, MUST be installed in the fixed wiring.
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.

2 | General safety precautions
Installer and user reference guide
12
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
▪After finishing the electrical work, confirm that each electrical component and
terminal inside the electrical components box is connected securely.
▪Make sure all covers are closed before starting up the unit.
CAUTION
▪When connecting the power supply: connect the earth cable first, before making
the current-carrying connections.
▪When disconnecting the power supply: disconnect the current-carrying cables
first, before separating the earth connection.
▪The length of the conductors between the power supply stress relief and the
terminal block itself MUST be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply is pulled loose from
the stress relief.
NOTICE
Precautions when laying power wiring:
▪Do NOT connect wiring of different thicknesses to the power terminal block (slack
in the power wiring may cause abnormal heat).
▪When connecting wiring which is the same thickness, do as shown in the figure
above.
▪For wiring, use the designated power wire and connect firmly, then secure to
prevent outside pressure being exerted on the terminal board.
▪Use an appropriate screwdriver for tightening the terminal screws. A screwdriver
with a small head will damage the head and make proper tightening impossible.
▪Over-tightening the terminal screws may break them.
Install power cables at least 1 meter away from televisions or radios to prevent
interference. Depending on the radio waves, a distance of 1meter may NOT be
sufficient.
NOTICE
ONLY applicable if the power supply is three‑phase, and the compressor has an ON/
OFF starting method.
If there exists the possibility of reversed phase after a momentary black out and the
power goes ON and OFF while the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed phase can break the
compressor and other parts.

3 | Specific installer safety instructions
Installer and user reference guide
13
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
General installation requirements
WARNING
▪Install all necessary countermeasures in case of refrigerant leakage according to
standard EN378 (see "14.1.3 Additional installation site requirements for CO₂
refrigerant"[460]).
▪Install a CO2 leak detector (field supply) in every room with refrigerant piping,
showcases or blower coils, and - if present - enable the function for refrigerant
leak detection (see the installation manual of the indoor units).
WARNING
Make sure installation, servicing, maintenance, repair and applied materials follow
the instructions from Daikin (including all documents listed in “Documentation set”)
and, in addition, comply with applicable legislation and are performed by qualified
persons only. In Europe and areas where IEC standards apply, EN/IEC 60335-2-40 is
the applicable standard.
CAUTION
Do NOT insert fingers, rods or other objects into the air inlet or outlet. When the fan
is rotating at high speed, it will cause injury.
About the box (see "12About the box"[ 4
41])
WARNING
A CO2 detector is ALWAYS recommended during storage and transport.
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.
CAUTION
To avoid injury, do NOT touch the air inlet or aluminium fins of the unit.
About the unit and options (see "13About the units and options"[ 4
45])
WARNING
ONLY the refrigeration parts that are also designed to work with R744 (CO2) shall be
connected to the system.
Unit installation (see "14Unit installation"[ 4
56])
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF ELECTROCUTION

3 | Specific installer safety instructions
Installer and user reference guide
14
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover is removed.
WARNING
Follow the service space dimensions in this manual for correct installation of the unit.
See "14.1.1Installation site requirements of the outdoor unit"[457].
WARNING
Fix the unit correctly. For instructions, see "14Unit installation"[456].
WARNING
Fixing method of the outdoor unit MUST be in accordance with the instructions from
this manual. See "14.3Mounting the outdoor unit"[468].
WARNING
▪Install all necessary countermeasures in case of refrigerant leakage according to
standard EN378 (see "14.1.3 Additional installation site requirements for CO₂
refrigerant"[460]).
▪Install a CO2 leak detector (field supply) in every room with refrigerant piping,
showcases or blower coils, and - if present - enable the function for refrigerant
leak detection (see the installation manual of the indoor units).
WARNING
In case of mechanical ventilation, take care the ventilated air is exhausted to the
outdoor space and NOT into another closed area.
WARNING
When using safety shut-off valves, make sure to install measures such as a bypassing
piping with a pressure relief valve (from liquid pipe to gas pipe). When the safety
shut-off valves close and no measures are installed, increased pressure may damage
the liquid piping.
WARNING
Serious injury and/or damage can result from the blow-off of the liquid receiver
safety valve (see "25.2Piping diagram: Outdoor unit"[4148]):
▪NEVER service the unit when the pressure at the liquid receiver is higher than the
set pressure of the liquid receiver safety valve (90bar gauge ±3%). If this safety
valve releases refrigerant, it can cause serious injury and/or damage.
▪If the pressure > set pressure, ALWAYS discharge from pressure relief devices
before servicing.
▪It is recommended to install and secure blow-off piping to the safety valve.
▪ONLY alter the safety valve if the refrigerant has been removed.
WARNING
All installed safety valves MUST ventilate to the outdoor space and NOT into a closed
area.

3 | Specific installer safety instructions
Installer and user reference guide
15
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
Install the unit ONLY in locations where the doors of the occupied space are NOT
tight fitting.
CAUTION
Appliance NOT accessible to the general public, install it in a secured area, protected
from easy access.
The equipment meets the requirements for commercial and light-industrial locations
when professionally installed and maintained.
CAUTION
This equipment is NOT intended for use in residential locations and will NOT
guarantee to provide adequate protection to radio reception in such locations.
CAUTION
Excessive concentrations of refrigerant R744 (CO2) in a closed room can lead to
unconsciousness and oxygen deficiency. Take appropriate measures.
See "To determine the minimum number of appropriate measures"[463].
CAUTION
If the safety valve operates inside the unit, CO2 gas may concentrate inside the casing
of the outdoor unit. Therefore, you should ALWAYS take a distance for your own
safety. You can close the outdoor unit if your portable CO2 detector confirmed that
the concentration of CO2 is at an acceptable level. For example, if 7kg CO2 is released
inside the casing, it takes around 5 minutes until the concentration of CO2 is low
enough.
Piping installation (see "15Piping installation"[ 4
72])
DANGER: RISK OF BURNING/SCALDING
WARNING
The field piping method MUST be in accordance with the instructions from this
manual. See "15Piping installation"[472].
WARNING
The unit contains small amounts of refrigerant R744.
WARNING
Any gas or oil remaining inside the stop valve may blow off the spun piping.
If these instructions are NOT followed correctly it may result in property damage or
personal injury, which may be serious depending on the circumstances.

3 | Specific installer safety instructions
Installer and user reference guide
16
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
WARNING
When stop valves are closed during service, the pressure of the closed circuit will
increase due to high ambient temperature. Make sure the pressure is kept below the
design pressure.
WARNING
ONLY connect the outdoor unit to showcases or blower coils with a design pressure:
▪At the high pressure side (liquid side) of 90bar gauge.
▪At the low pressure side (gas side) of 60bar gauge (is possible with safety valve at
field gas piping).
WARNING
▪ONLY use R744 (CO2) as refrigerant. Other substances may cause explosions and
accidents.
▪When installing, charging refrigerant, maintaining or performing service, ALWAYS
use personal protective equipment, such as safety shoes, safety gloves and safety
glasses.
▪If the unit is installed indoors (for example, in a machine room), ALWAYS use a
portable CO2 detector.
▪If the front panel is open, ALWAYS beware of the rotating fan. The fan will
continue rotating for a while, even after the power switch has been turned off.
WARNING
▪Use K65 or equivalent piping for high-pressure applications with a working
pressure of 90bar gauge.
▪Use K65 or equivalent unions and fittings approved for a working pressure of
90bar gauge.
▪ONLY brazing is allowed to connect pipes. No other types of connections are
allowed.
▪Expanding pipes is NOT allowed.
WARNING
Serious injury and/or damage can result from the blow-off of the liquid receiver
safety valve (see "25.2Piping diagram: Outdoor unit"[4148]):
▪NEVER service the unit when the pressure at the liquid receiver is higher than the
set pressure of the liquid receiver safety valve (90bar gauge ±3%). If this safety
valve releases refrigerant, it can cause serious injury and/or damage.
▪If the pressure > set pressure, ALWAYS discharge from pressure relief devices
before servicing.
▪It is recommended to install and secure blow-off piping to the safety valve.
▪ONLY alter the safety valve if the refrigerant has been removed.

3 | Specific installer safety instructions
Installer and user reference guide
17
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
All installed safety valves MUST ventilate to the outdoor space and NOT into a closed
area.
WARNING
Install safety valves in a proper way according to the applicable national regulation.
WARNING
To ensure that the safety valve(s) and the changeover valve are properly reinstalled,
a leak test is mandatory.
CAUTION
NEVER bend high pressure piping! Bending can reduce the pipe thickness and thus
weaken the piping. ALWAYS use K65 fittings.
CAUTION
When installing a safety valve, ALWAYS add enough support to the valve. An
activated safety valve is under high pressure. If not installed securely, the safety valve
may cause damage to the piping or the unit.
CAUTION
Do NOT open the stop valve until you have measured the insulation resistance of the
main power supply circuit.
CAUTION
ALWAYS use nitrogen gas for leak tests.
CAUTION
ALWAYS use K65 T-joints for refrigerant branching.
CAUTION
Install the refrigerant piping or components in a position where they are unlikely to
be exposed to any substance which may corrode components containing refrigerant,
unless the components are constructed of materials that are inherently resistant to
corrosion or are suitably protected against corrosion.
Electrical installation (see "16Electrical installation"[ 4
101])
DANGER: RISK OF ELECTROCUTION

3 | Specific installer safety instructions
Installer and user reference guide
18
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
Electrical wiring connection method MUST be in accordance with the instructions
from:
▪This manual. See "16Electrical installation"[4101].
▪The wiring diagram of the outdoor unit, which is delivered with the unit, located
on the inside of the top plate. For a translation of its legend, see "25.4 Wiring
diagram: Outdoor unit"[4150].
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.
WARNING
▪If the power supply has a missing or wrong N-phase, equipment might break
down.
▪Establish proper earthing. Do NOT earth the unit to a utility pipe, surge absorber,
or telephone earth. Incomplete earthing may cause electrical shock.
▪Install the required fuses or circuit breakers.
▪Secure the electrical wiring with cable ties so that the cables do NOT come in
contact with sharp edges or piping, particularly on the high-pressure side.
▪Do NOT use taped wires, extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
▪Do NOT install a phase advancing capacitor, because this unit is equipped with an
inverter. A phase advancing capacitor will reduce performance and may cause
accidents.
WARNING
▪All wiring MUST be performed by an authorised electrician and MUST comply
with the applicable national wiring regulation.
▪Make electrical connections to the fixed wiring.
▪All components procured on-site and all electrical construction MUST comply
with the applicable legislation.
WARNING
If 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
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least 3mm between the contact
point gaps that provides full disconnection under overvoltage category III.
WARNING
If the supply cord is damaged, it MUST be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.

3 | Specific installer safety instructions
Installer and user reference guide
19
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
CAUTION
This equipment is NOT intended for use in residential locations and will NOT
guarantee to provide adequate protection to radio reception in such locations.
Charging refrigerant (see "17Charging refrigerant"[ 4
116])
WARNING
Charging of refrigerant MUST be in accordance with the instructions from this
manual. See "17Charging refrigerant"[4116].
WARNING
▪ONLY use R744 (CO2) as refrigerant. Other substances may cause explosions and
accidents.
▪When installing, charging refrigerant, maintaining or performing service, ALWAYS
use personal protective equipment, such as safety shoes, safety gloves and safety
glasses.
▪If the unit is installed indoors (for example, in a machine room), ALWAYS use a
portable CO2 detector.
▪If the front panel is open, ALWAYS beware of the rotating fan. The fan will
continue rotating for a while, even after the power switch has been turned off.
WARNING
After charging refrigerant, keep the power supply and operation switch of the
outdoor unit ON to avoid a pressure increase on the low pressure (suction piping)
side and to avoid pressure increase on the pressure side of the liquid receiver.
CAUTION
A vacuumed system will be under triple point. To avoid solid ice, ALWAYS start
charging with R744 in vapour state. When the triple point is reached (5.2 bar
absolute pressure or 4.2bar gauge pressure), you may continue charging with R744
in liquid state.
CAUTION
Do NOT charge liquid refrigerant directly from a gas line. Liquid compression could
cause compressor operation failure.
Configuration (see "19Configuration"[ 4
123])
DANGER: RISK OF ELECTROCUTION
WARNING
If any part of system is already (accidentally) powered on, setting [2-21] on the
outdoor unit can be set to value1 to open the expansion valves (E1V, E2V, E7V, E8V,
E15V).
Commissioning (see "20Commissioning"[ 4
128])
DANGER: RISK OF ELECTROCUTION

3 | Specific installer safety instructions
Installer and user reference guide
20
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
DANGER: RISK OF BURNING/SCALDING
WARNING
Commissioning method MUST be in accordance with the instructions from this
manual. See "20Commissioning"[4128].
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
ALWAYS turn off the operation switch BEFORE turning off the power supply.
CAUTION
After the refrigerant is fully charged, do NOT turn off the operation switch and power
supply of the outdoor unit. This prevents the safety valve actuation due to an
increase in internal pressure under high ambient temperature conditions.
When internal pressure rises, the outdoor unit can operate by itself to reduce the
internal pressure, even if no indoor unit is operating.
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.
Maintenance and service (see "22Maintenance and service"[ 4
136])
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage
NEVER pump down the system. Possible consequence: If more than 5.2kg is trapped
in the unit this can cause a release of refrigerant via the safety valve. Also, when
pumping down during a leakage self-combustion and explosion of the compressor
can happen because of air going into the operating compressor.
CAUTION
The safety valve on the liquid receiver is set to 90 bar gauge. If the refrigerant
temperature is ≥31°C, the safety valve might be activated. When you close the stop
valves, ALWAYS and REGULARLY check the pressure in the circuit and avoid that the
safety valve is activated.