Daikin REYQ8T7Y1B, REYQ10T7Y1B, REYQ12T7Y1B, REYQ14T7Y1B, REYQ16T7Y1B Installer reference guide
...
Installer and user
reference guide
VRV IV system air conditioner
REYQ8T7Y1B
REYQ10T7Y1B
REYQ12T7Y1B
REYQ14T7Y1B
REYQ16T7Y1B
REYQ18T7Y1B
REYQ20T7Y1B
REMQ5T7Y1B
Installer and user reference guide
VRV IV system air conditioner
English
Table of contents
Table of contents
1 General safety precautions 3
1.1 About the documentation .......................................................... 3
1.1.1 Meaning of warnings and symbols.............................. 3
1.2 For the user ............................................................................... 4
1.3 For the installer.......................................................................... 4
1.3.1 General ....................................................................... 4
1.3.2 Installation site ............................................................ 5
1.3.3 Refrigerant .................................................................. 5
1.3.4 Brine............................................................................ 6
1.3.5 Water .......................................................................... 6
1.3.6 Electrical ..................................................................... 6
2 About the documentation 7
2.1 About this document.................................................................. 7
For the installer 7
3 About the box 7
3.1 Overview: About the box ........................................................... 7
3.2 To unpack the outdoor unit........................................................ 7
3.3 To remove the accessories from the outdoor unit ..................... 8
3.4 Accessory pipes: Diameters...................................................... 8
3.5 To remove the transportation stay............................................. 8
4 About the units and options 9
4.1 Overview: About the units and options...................................... 9
4.2 Identification label: Outdoor unit................................................ 9
4.3 About the outdoor unit ............................................................... 9
4.4 System layout............................................................................ 9
4.5 Combining units and options ..................................................... 10
4.5.1 About combining units and options............................. 10
4.5.2 Possible combinations of indoor units......................... 10
4.5.3 Possible combinations of outdoor units ...................... 10
4.5.4 Possible options for the outdoor unit........................... 10
6.4.1 Precautions when connecting the refrigerant piping.... 22
6.4.2 About connecting the refrigerant piping ....................... 22
6.4.3 To route the refrigerant piping...................................... 22
6.4.4 To connect the refrigerant piping to the outdoor unit ... 23
6.4.5 To connect the multi connection piping kit................... 23
6.4.6 Multiple outdoor units: Knockout holes ........................ 23
6.4.7 To connect the refrigerant branching kit ...................... 23
6.4.8 To protect against contamination................................. 23
6.4.9 To braze the pipe end .................................................. 24
6.4.10 Using the stop valve and service port .......................... 24
6.4.11 To remove the pinched pipes....................................... 25
6.5 Checking the refrigerant piping .................................................. 26
6.5.1 About checking the refrigerant piping .......................... 26
6.5.2 Checking refrigerant piping: General guidelines.......... 26
6.5.3 Checking refrigerant piping: Setup............................... 26
6.5.4 To perform a leak test .................................................. 26
6.5.5 To perform vacuum drying ........................................... 27
6.6 To insulate the refrigerant piping................................................ 27
6.7 Charging refrigerant ................................................................... 27
6.7.1 Precautions when charging refrigerant ........................ 27
6.7.2 About charging refrigerant ........................................... 28
6.7.3 To determine the additional refrigerant amount........... 28
6.7.4 To charge refrigerant: Flow chart................................. 29
6.7.5 To charge refrigerant ................................................... 31
6.7.6 Step 6a: To automatically charge refrigerant............... 32
6.7.7 Step 6b: To manually charge refrigerant...................... 33
6.7.8 Error codes when charging refrigerant......................... 34
6.7.9 Checks after charging refrigerant................................. 34
6.7.10 To fix the fluorinated greenhouse gases label ............. 34
6.8 Connecting the electrical wiring.................................................. 34
6.8.1 Precautions when connecting electrical wiring ............ 34
6.8.2 Field wiring: Overview.................................................. 35
6.8.3 About the electrical wiring ............................................ 35
6.8.4 Guidelines when knocking out knockout holes ............ 36
6.8.5 To route and fix the transmission wiring ...................... 36
6.8.6 To connect the transmission wiring.............................. 36
6.8.7 To finish the transmission wiring.................................. 37
6.8.8 To route and fix the power supply................................ 37
6.8.9 To connect the power supply ....................................... 37
5 Preparation 11
5.1 Overview: Preparation............................................................... 11
5.2 Preparing the installation site .................................................... 11
5.2.1 Installation site requirements of the outdoor unit ........ 11
5.2.2 Additional installation site requirements of the
outdoor unit in cold climates ....................................... 12
5.2.3 Securing safety against refrigerant leaks.................... 13
5.3 Preparing refrigerant piping....................................................... 13
5.3.1 Refrigerant piping requirements.................................. 13
5.3.2 To select the piping size ............................................. 14
5.3.3 To select refrigerant branch kits.................................. 15
5.3.4 About the piping length ............................................... 15
5.3.5 Single outdoor units and standard multi-outdoor-unit
combinations >20 HP.................................................. 16
5.3.6 Standard multi-outdoor-unit combinations ≤20 HP
and free multi-outdoor-unit combinations.................... 17
5.3.7 Multiple outdoor units: Possible layouts...................... 18
5.4 Preparing electrical wiring ......................................................... 19
5.4.1 About electrical compliance ........................................ 19
5.4.2 Safety device requirements ........................................ 20
6 Installation 20
6.1 Overview: Installation ................................................................ 20
6.2 Opening the units ...................................................................... 21
6.2.1 To open the outdoor unit............................................. 21
6.2.2 To open the electrical component box of the outdoor
unit .............................................................................. 21
6.3 Mounting the outdoor unit.......................................................... 21
6.3.1 To provide the installation structure............................ 21
6.4 Connecting the refrigerant piping .............................................. 22
7 Configuration 38
7.1 Overview: Configuration ............................................................. 38
7.2 Making field settings................................................................... 38
7.2.1 About making field settings .......................................... 38
7.2.2 Field setting components ............................................. 38
7.2.3 To access the field setting components....................... 38
7.2.4 To access mode 1 or 2 ................................................ 39
7.2.5 To use mode 1 ............................................................. 39
7.2.6 To use mode 2 ............................................................. 39
7.2.7 Mode 1: Monitoring settings......................................... 40
7.2.8 Mode 2: Field settings.................................................. 41
7.2.9 To connect the PC configurator to the outdoor unit ..... 43
7.3 Energy saving and optimum operation....................................... 44
7.3.1 Available main operation methods............................... 44
7.3.2 Available comfort settings ............................................ 44
7.3.3 Example: Automatic mode during cooling.................... 45
7.3.4 Example: Automatic mode during heating ................... 46
7.4 Using the leak detection function ............................................... 46
7.4.1 About automatic leak detection.................................... 46
7.4.2 To manually perform a leak detection.......................... 46
8 Commissioning 47
8.1 Overview: Commissioning.......................................................... 47
8.2 Precautions when commissioning .............................................. 47
8.3 Checklist before commissioning................................................. 47
8.4 About the test run ....................................................................... 48
8.5 To perform a test run.................................................................. 48
8.6 Correcting after abnormal completion of the test run ................. 48
8.7 Operating the unit....................................................................... 48
Installer and user reference guide
2
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
1 General safety precautions
9 Maintenance and service 49
9.1 Overview: Maintenance and service ......................................... 49
9.2 Maintenance safety precautions................................................ 49
9.2.1 To prevent electrical hazards...................................... 49
9.3 About service mode operation................................................... 49
9.3.1 To use vacuum mode ................................................. 49
9.3.2 To recover refrigerant ................................................. 49
10 Troubleshooting 49
10.1 Overview: Troubleshooting........................................................ 49
10.2 Solving problems based on error codes .................................... 50
10.3 Error codes: Overview ............................................................... 50
11 Disposal 53
12 Technical data 54
12.1 Overview: Technical data .......................................................... 54
12.2 Dimensions................................................................................ 54
12.3 Service space: Outdoor unit ...................................................... 55
12.4 Components: Outdoor unit ........................................................ 56
12.5 Components: Electrical component box .................................... 58
12.6 Piping diagram: Outdoor unit..................................................... 59
12.7 Wiring diagram: Outdoor unit .................................................... 61
12.8 Technical specifications: Outdoor unit....................................... 70
12.9 Capacity table: Indoor unit......................................................... 72
For the user 73
13 About the system 73
13.1 System layout ............................................................................ 73
14 User interface 73
15 Before operation 74
16 Operation 74
16.1 Operation range ........................................................................ 74
16.2 Operating the system ................................................................ 74
16.2.1 About operating the system ........................................ 74
16.2.2 About cooling, heating, fan only, and automatic
operation ..................................................................... 74
16.2.3 About the heating operation ........................................ 74
16.2.4 To operate the system (WITHOUT cool/heat
changeover remote control switch) ............................. 75
16.2.5 To operate the system (WITH cool/heat changeover
remote control switch)................................................. 75
16.3 Using the dry program ............................................................... 75
16.3.1 About the dry program ................................................ 75
16.3.2 To use the dry program (WITHOUT cool/heat
changeover remote control switch) ............................. 75
16.3.3 To use the dry program (WITH cool/heat changeover
remote control switch)................................................. 76
16.4 Adjusting the air flow direction................................................... 76
16.4.1 About the air flow flap ................................................. 76
16.5 Setting the master user interface .............................................. 76
16.5.1 About setting the master user interface ...................... 76
16.5.2 To designate the master user interface (VRV DX and
Hydrobox) ................................................................... 76
16.6 About control systems ............................................................... 76
17 Energy saving and optimum operation 77
17.1 Available main operation methods ............................................ 77
17.2 Available comfort settings ......................................................... 77
18 Maintenance and service 77
18.1 Maintenance after a long stop period ........................................ 78
18.2 Maintenance before a long stop period ..................................... 78
18.3 About the refrigerant.................................................................. 78
18.4 After-sales service and warranty ............................................... 78
18.4.1 Warranty period .......................................................... 78
18.4.2 Recommended maintenance and inspection .............. 78
18.4.3 Recommended maintenance and inspection cycles .... 79
18.4.4 Shortened maintenance and replacement cycles ........ 79
19 Troubleshooting 79
19.1 Error codes: Overview ................................................................ 80
19.2 Symptoms that are NOT system malfunctions ........................... 81
19.2.1 Symptom: The system does not operate ..................... 81
19.2.2 Symptom: Cool/Heat cannot be changed over ............ 81
19.2.3 Symptom: Fan operation is possible, but cooling and
heating do not work...................................................... 81
19.2.4 Symptom: The fan speed does not correspond to the
setting .......................................................................... 81
19.2.5 Symptom: The fan direction does not correspond to
the setting .................................................................... 81
19.2.6 Symptom: White mist comes out of a unit (Indoor
unit) .............................................................................. 81
19.2.7 Symptom: White mist comes out of a unit (Indoor
unit, outdoor unit) ......................................................... 81
19.2.8 Symptom: The user interface display reads "U4" or
"U5" and stops, but then restarts after a few minutes.. 81
19.2.9 Symptom: Noise of air conditioners (Indoor unit) ......... 81
19.2.10 Symptom: Noise of air conditioners (Indoor unit,
outdoor unit)................................................................. 81
19.2.11 Symptom: Noise of air conditioners (Outdoor unit) ...... 81
19.2.12 Symptom: Dust comes out of the unit .......................... 81
19.2.13 Symptom: The units can give off odours...................... 81
19.2.14 Symptom: The outdoor unit fan does not spin ............. 81
19.2.15 Symptom: The display shows "88"............................... 82
19.2.16 Symptom: The compressor in the outdoor unit does
not stop after a short heating operation ....................... 82
19.2.17 Symptom: The inside of an outdoor unit is warm
even when the unit has stopped .................................. 82
19.2.18 Symptom: Hot air can be felt when the indoor unit is
stopped ........................................................................ 82
20 Relocation 82
21 Disposal 82
22 Glossary 82
1 General safety precautions
1.1 About the documentation
▪ The original documentation is written in English. All other
languages are translations.
▪ The precautions described in this document cover very important
topics, follow them carefully.
▪ The installation of the system, and all activities described in the
installation manual and the installer reference guide MUST be
performed by an authorised installer.
1.1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING
Indicates a situation that could result in burning because of
extreme hot or cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
3
1 General safety precautions
WARNING
Indicates a situation that could result in death or serious
injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate
injury.
NOTICE
Indicates a situation that could result in equipment or
property damage.
INFORMATION
Indicates useful tips or additional information.
Symbol Explanation
Before installation, read the installation and
operation manual, and the wiring instruction sheet.
Before performing maintenance and service tasks,
read the service manual.
For more information, see the installer and user
reference guide.
1.2 For the user
▪ If you are NOT sure how to operate the unit, contact your installer.
▪ This appliance can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in
a safe way and understand the hazards involved. Children shall
NOT play with the appliance. Cleaning and user maintenance
shall NOT be made by children without supervision.
WARNING
To prevent electric shocks or fire:
▪ Do NOT rinse the unit.
▪ Do NOT operate the unit with wet hands.
▪ Do NOT place any objects containing water on the unit.
NOTICE
▪ Do NOT place any objects or equipment on top of the
unit.
▪ Do NOT sit, climb or stand on the unit.
▪ Units are marked with the following symbol:
This means that electrical and electronic products may NOT be
mixed with unsorted household waste. Do NOT try to dismantle
the system yourself: the dismantling of the system, treatment of
the refrigerant, of oil and of other parts must be done by an
authorized installer and must comply with applicable legislation.
Units must be treated at a specialized treatment facility for reuse,
recycling and recovery. By ensuring this product is disposed of
correctly, you will help to prevent potential negative consequences
for the environment and human health. For more information,
contact your installer or local authority.
▪ Batteries are marked with the following symbol:
This means that the batteries may NOT be mixed with unsorted
household waste. If a chemical symbol is printed beneath the
symbol, this chemical symbol means that the battery contains a
heavy metal above a certain concentration.
Possible chemical symbols are: Pb: lead (>0.004%).
Waste batteries must be treated at a specialized treatment facility
for reuse. By ensuring waste batteries are disposed of correctly,
you will help to prevent potential negative consequences for the
environment and human health.
1.3 For the installer
1.3.1 General
If you are NOT sure how to install or operate the unit, contact your
dealer.
NOTICE
Improper installation or attachment of equipment or
accessories could result in electric shock, short-circuit,
leaks, fire or other damage to the equipment. Only use
accessories, optional equipment and spare parts made or
approved by Daikin.
WARNING
Make sure installation, testing and applied materials
comply with applicable legislation (on top of the
instructions described in the Daikin documentation).
CAUTION
Wear adequate personal protective equipment (protective
gloves, safety glasses,…) when installing, maintaining or
servicing the system.
WARNING
Tear apart and throw away plastic packaging bags so that
nobody, especially children, can play with them. Possible
risk: suffocation.
DANGER: RISK OF BURNING
▪ Do NOT touch the refrigerant piping, water piping or
internal parts during and immediately after operation. It
could be too hot or too cold. Give it time to return to
normal temperature. If you must touch it, wear
protective gloves.
▪ Do NOT touch any accidental leaking refrigerant.
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
CAUTION
Do NOT touch the air inlet or aluminium fins of the unit.
NOTICE
▪ Do NOT place any objects or equipment on top of the
unit.
▪ Do NOT sit, climb or stand on the unit.
NOTICE
Works executed on the outdoor unit are best done under
dry weather conditions to avoid water ingress.
Installer and user reference guide
4
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
1 General safety precautions
In accordance with the applicable legislation, it might be necessary
to provide a logbook with the product containing at least: information
on maintenance, repair work, results of tests, stand-by periods,…
Also, at least, following information MUST be provided at an
accessible place at the product:
▪ Instructions for shutting down the system in case of an emergency
▪ Name and address of fire department, police and hospital
▪ Name, address and day and night telephone numbers for
obtaining service
In Europe, EN378 provides the necessary guidance for this logbook.
1.3.2 Installation site
▪ Provide sufficient space around the unit for servicing and air
circulation.
▪ Make sure the installation site withstands the unit's weight and
vibration.
▪ Make sure the area is well ventilated. Do NOT block any
ventilation openings.
▪ Make sure the unit is level.
Do NOT install the unit in the following places:
▪ In potentially explosive atmospheres.
▪ In places where there is machinery that emits electromagnetic
waves. Electromagnetic waves may disturb the control system,
and cause malfunction of the equipment.
▪ In places where there is a risk of fire due to the leakage of
flammable gases (example: thinner or gasoline), carbon fibre,
ignitable dust.
▪ In places where corrosive gas (example: sulphurous acid gas) is
produced. Corrosion of copper pipes or soldered parts may cause
the refrigerant to leak.
1.3.3 Refrigerant
If applicable. See the installation manual or installer reference guide
of your application for more information.
NOTICE
Make sure refrigerant piping installation complies with
applicable legislation. In Europe, EN378 is the applicable
standard.
NOTICE
Make sure the field piping and connections are NOT
subjected to stress.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump
down the system, and there is a leak in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit. Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
WARNING
ALWAYS recover the refrigerant. Do NOT release them
directly into the environment. Use a vacuum pump to
evacuate the installation.
NOTICE
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak detection.
NOTICE
▪ To avoid compressor breakdown, do NOT charge more
than the specified amount of refrigerant.
▪ When the refrigerant system is to be opened,
refrigerant MUST be treated according to the applicable
legislation.
WARNING
Make sure there is no oxygen in the system. Refrigerant
may only be charged after performing the leak test and the
vacuum drying.
▪ In case re-charge is required, refer to the nameplate of the unit. It
states the type of refrigerant and necessary amount.
▪ The unit is factory charged with refrigerant and depending on pipe
sizes and pipe lengths some systems require additional charging
of refrigerant.
▪ Only use tools exclusively for the refrigerant type used in the
system, this to ensure pressure resistance and prevent foreign
materials from entering into the system.
▪ Charge the liquid refrigerant as follows:
If Then
A siphon tube is present
(i.e., the cylinder is marked with
"Liquid filling siphon attached")
Charge with the cylinder upright.
WARNING
During tests, NEVER pressurize the product with a
pressure higher than the maximum allowable pressure (as
indicated on the nameplate of the unit).
WARNING
Take sufficient precautions in case of refrigerant leakage. If
refrigerant gas leaks, ventilate the area immediately.
Possible risks:
▪ Excessive refrigerant concentrations in a closed room
can lead to oxygen deficiency.
▪ Toxic gas may be produced if refrigerant gas comes
into contact with fire.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
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.
Installer and user reference guide
5
1 General safety precautions
CAUTION
When the refrigerant charging procedure is done or when
pausing, close the valve of the refrigerant tank
immediately. If the valve is NOT closed immediately,
remaining pressure might charge additional refrigerant.
Possible consequence: Incorrect refrigerant amount.
1.3.4 Brine
If applicable. See the installation manual or installer reference guide
of your application for more information.
WARNING
The selection of the brine MUST be in accordance with the
applicable legislation.
WARNING
Take sufficient precautions in case of brine leakage. If
brine leaks, ventilate the area immediately and contact
your local dealer.
WARNING
The ambient temperature inside the unit can get much
higher than that of the room, e.g. 70°C. In case of a brine
leak, hot parts inside the unit can create a hazardous
situation.
WARNING
The use and installation of the application MUST comply
with the safety and environmental precautions specified in
the applicable legislation.
WARNING
▪ ONLY use copper wires.
▪ Make sure the field wiring complies with the applicable
legislation.
▪ All field wiring MUST be performed in accordance with
the wiring diagram supplied with the product.
▪ NEVER squeeze bundled cables and make sure they
do NOT come in contact with the piping and sharp
edges. Make sure no external pressure is applied to the
terminal connections.
▪ Make sure to install earth wiring. Do NOT earth the unit
to a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
▪ Make sure to use a dedicated power circuit. NEVER
use a power supply shared by another appliance.
▪ Make sure to install the required fuses or circuit
breakers.
▪ Make sure to install an earth leakage protector. Failure
to do so may cause electric shock or fire.
▪ When installing the earth leakage protector, make sure
it is compatible with the inverter (resistant to high
frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
NOTICE
Precautions when laying power wiring:
1.3.5 Water
If applicable. See the installation manual or installer reference guide
of your application for more information.
NOTICE
Make sure water quality complies with EU directive
98/83EC.
1.3.6 Electrical
DANGER: RISK OF ELECTROCUTION
▪ Turn OFF all power supply before removing the
switch box cover, connecting electrical wiring or
touching electrical parts.
▪ Disconnect the power supply for more than 1 minute,
and measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing.
The voltage MUST be less than 50 V DC before you
can touch electrical components. For the location of the
terminals, see the wiring diagram.
▪ Do NOT touch electrical components with wet hands.
▪ Do NOT leave the unit unattended when the service
cover is removed.
WARNING
If NOT factory installed, a main switch or other means for
disconnection, having a contact separation in all poles
providing full disconnection under overvoltage category III
condition, MUST be installed in the fixed wiring.
▪ 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 1metre away from televisions or radios
to prevent interference. Depending on the radio waves, a distance of
1metre 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.
Installer and user reference guide
6
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
2 About the documentation
d
d
b
b
d
c
a
c
2 About the documentation
2.1 About this document
Target audience
Authorised installers + end users
INFORMATION
This appliance is intended to be used by expert or trained
users in shops, in light industry and on farms, or for
commercial use by lay persons.
Documentation set
This document is part of a documentation set. The complete set
consists of:
▪ General safety precautions:
▪ Safety instructions that you must read before installing
▪ Format: Paper (in the box of the outdoor unit)
For the installer
▪ Outdoor unit installation and operation manual:
▪ Installation and operation instructions
▪ Format: Paper (in the box of the outdoor unit)
▪ Installer and user reference guide:
▪ Preparation of the installation, reference data,…
▪ Detailed step-by-step instructions and background information
for basic and advanced usage
▪ Format: Digital files on http://www.daikineurope.com/support-
and-manuals/product-information/
Latest revisions of the supplied documentation may be available on
the regional Daikin website or via your dealer.
The original documentation is written in English. All other languages
are translations.
Technical engineering data
▪ A subset of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The full set of latest technical data is available on the Daikin
extranet (authentication required).
3 About the box
3.1 Overview: About the box
This chapter describes what you have to do after the box with the
outdoor unit is delivered on-site.
It contains information about:
▪ Unpacking and handling the outdoor unit
▪ Removing the accessories from the unit
▪ Removing the transportation stay
Keep the following in mind:
▪ At delivery, the unit MUST be checked for damage. Any damage
MUST be reported immediately to the carrier's claims agent.
▪ Bring the packed unit as close as possible to its final installation
position to prevent damage during transport.
▪ When handling the unit, take into account the following:
Fragile, handle the unit with care.
Keep the unit upright in order to avoid compressor
damage.
▪ Prepare the path along which you want to bring the unit inside in
advance.
▪ Lift the unit preferably with a crane and 2 belts of at least 8m long
as shown in the figure below. Always use protectors to prevent
belt damage and pay attention to the position of the unit's centre
of gravity.
a Packaging material
b Belt sling
c Opening
d Protector
NOTICE
Use a belt sling of ≤20mm wide that adequately bears the
weight of the unit.
▪ A forklift can only be used for transport as long as the unit remains
on its pallet as shown above.
3.2 To unpack the outdoor unit
Remove the packaging material from the unit:
▪ Take care not to damage the unit when removing the shrink foil
with a cutter.
▪ Remove the 4 bolts fixing the unit to its pallet.
WARNING
Tear apart and throw away plastic packaging bags so that
nobody, especially children, can play with them. Possible
risk: suffocation.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
7
3 About the box
5~12 HP
14~20 HP
14~20 HP5~12 HP
a d
1× 1×
e
1×
3P328191-1
BE SURE TO FILL OUT THE BLANKS, WHICH ARE NEEDED FOR AFTER-SALE SERVICES.
REQUEST FOR THE INDICATION OF INSTALLATION INFORMATION
1. RECORD OF INDOOR UNIT MODEL AND INSTALLATION SITE
2. RECORD FOR SETTINGS (CONTENTS SEE INSTALLATION MANUAL)
SETTING
40
30
10
2019
9
29
3938
28
8
1817
7
27
3736
26
6
1615
5
25
3534
23 24
4321
INSTALLATION
MODELNAME
No.
12 13 14
504948474645
6059585756
64636261
11
2221
333231
44434241
5554535251
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
INSTALLATION
MODELNAME
No.
SITE
3. RECORD OF INSTALLATION DATE
6. AFTER EQUIPPING, PLEASE PUT IT ON THE BACK SIDE OF THE FRONT PLATE.
DAY MONTH YEAR
4. MODEL NAME 5. MANUFACTURING NUMBER
VALUE
REMARK DATE SETTING VALUE REMARK DATE
3P328192-1
3. FOR DETAILS CONCERNING PIPING SELECTION AND CALCULATION OR HOW TO OPERATE THE LEAK DETECTION FUNCTION, PLEASE REFER TO THE INSTALLATION MANUAL.
2. RECORD OF ADDITIONAL REFRIGERANT CHARGE AMOUNT AND RESULT OF LEAK CHECK OPERATION
REQUEST FOR THE INDICATION OF ADDITIONAL REFRIGERANT CHARGING AND LEAK DETECTION OPERATION RESULT
BE SURE TO FILL OUT THE BLANKS, WHICH ARE NEEDED FOR AFTER-SALE SERVICES.
1. CALCULATION OF ADDITIONAL REFRIGERANT CHARGING AMOUNT
4. AFTER FILLING IN THIS TABLE, PLEASE PUT IT ON THE SWITCH BOX COVER.
(m) x 0.18(m) x 0.37
kg
OUTDOOR
UNIT
(m) x 0.26
(m) x 0.12 (m) x 0.059
(m) x 0.022
ADDITIONAL CHARGING
AMOUNT
TOTAL LENGTH OF LIQUID
PIPE SIZE O22.2 x 0.37
TOTAL LENGTH OF LIQUID
PIPE SIZE O19.1 x 0.26
TOTAL LENGTH OF LIQUID
PIPE SIZE O15.9 x 0.18
TOTAL LENGTH OF LIQUID
PIPE SIZE O12.7 x 0.12
TOTAL LENGTH OF LIQUID
PIPE SIZE O9.5 x 0.059
TOTAL LENGTH OF LIQUID
PIPE SIZE O6.4 x 0.022
105%< CR < 130%
50%< CR < 105%
50%< CR < 70%
70%< CR < 85%
85%< CR < 105%
105%< CR < 130%
8HP
Total indoor unit
capacity connection
ratio (CR)
10-12HP
14-16HP
18-20HP
2.0
1.5
1.5
1.2
1.5
1
1
0.7
1.0
0.5
0.5
0.3
0.5
0
0
0
1.0
0.5
0.5
0.5
0.5
0
0
0
Total indoor unit capacity
when piping length <30m
Total indoor unit capacity
when piping length >30m
kg
1.3
1.1
0.9
RYYQ18-20
RYYQ14-16
RYYQ8~12
kg
ONLY FOR RYYQ8~20 MODELS
DATE
AMOUNT
CALCULATE THE ADDITIONAL REFRIGERANT CHARGING AMOUNT BASED ON THE FORMULA BELOW BEFORE CHARGING.
SHIPMENT (INDICATED ON THE MACHINE NAMEPLATE) AND THE ADDITIONAL AMOUNT SHOWN AS FOLLOWS :
WHEN RE-CHARGING TOTAL AMOUNT OF REFRIGERANT , CHARGE THE TOTAL OF THE AMOUNT CHARGED AT
RESULT LEAK CHECK
DATE
AMOUNT
RESULT LEAK CHECK
DATE
AMOUNT
RESULT LEAK CHECK
DATE
AMOUNT
RESULT LEAK CHECK
c
1×
b
1×
f g
1×1×
ID Øa
ID Øb
ID Øa
OD Øb
ID Øb
ID Øa
ID Øb
ID Øa
ID Øa
ID Øb
ID Øa
OD Øb
3.3 To remove the accessories from the outdoor unit
Make sure that all accessories are available in the unit.
a General safety precautions
b Installation manual and operation manual
c Additional refrigerant charge label
d Installation information sticker
e Fluorinated greenhouse gases label
f Multilingual fluorinated greenhouse gases label
g Piping accessory bag
3.4 Accessory pipes: Diameters
Accessory pipes (mm) HP Øa Øb
Gas pipe
▪ Front connection
▪ Bottom connection
Liquid pipe
▪ Front connection
▪ Bottom connection
High pressure/low pressure
gas pipe
▪ Front connection
▪ Bottom connection
(a) Only in combination with the outdoor unit multi-connection
piping kit.
5 25.4 19.1
8
10 22.2
12 28.6
14
16
18
20
(a)
18+20
5 9.5 9.5
8
10
12 12.7
14 12.7
16
18 15.9
20
5 19.1 15.9
8
10 19.1
12
14 22.2
16
18
20 28.6
31.8 41.4
Installer and user reference guide
8
3.5 To remove the transportation stay
Only for REMQ5 (1×) + REYQ8 (1×) + REYQ14~20 (2×)
NOTICE
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
4 About the units and options
1
3 (12.3 N·m)
2
1
3 (12.3 N·m)
2
a
b
14~20 HP5~12 HP
The transportation stay installed over the compressor leg for
protecting the unit during transport must be removed. Proceed as
shown in the figure and procedure below.
1 Slightly loosen the fixing nut (a).
2 Remove the transportation stay (b) as shown in the figure
below.
3 Tighten the fixing nut (a) again.
4 About the units and options
4.1 Overview: About the units and options
This chapter contains information about:
▪ Identification of the outdoor unit
▪ Where the outdoor unit fits in the system layout
▪ With which indoor units and options you can combine the outdoor
units
▪ Which outdoor units have to be used as standalone units, and
which outdoor units can be combined
4.2 Identification label: Outdoor unit
Location
Code Explanation
T7 Model series
Y1 Power supply
B European market
[*] Minor model change indication
4.3 About the outdoor unit
This installation manual concerns the VRV IV, full inverter driven,
heat recovery system.
Model line up:
Model Description
REYQ8~20 Heat recovery model for single or multi-use
REMQ5 Heat recovery model for multi-use only
Depending on the type of outdoor unit which is chosen, some
functionality will or will not exist. It will be indicated throughout this
installation manual and brought to your attention. Certain features
have exclusive model rights.
These units are intended for outdoor installation and aimed for heat
pump applications including air to air and air to water applications.
These units have (in single use) heating capacities ranging from 25
to 63kW and cooling capacities rating from 22.4 to 56 kW. In multi
combination the heating capacity can go up till 168 kW and in
cooling till 150kW.
The outdoor unit is designed to work in heating mode at ambient
temperatures from –20°CWB to 15.5°CWB and in cooling mode at
ambient temperatures from –5°CDB to 43°CDB.
4.4 System layout
NOTICE
Design of the system must not be done at temperatures
below –15°C.
INFORMATION
Not all combinations of indoor units are allowed, for
guidance, see "4.5.2 Possible combinations of indoor
units"on page10.
Model identification
Example: R E Y Q 18 T7 Y1 B [*]
Code Explanation
R Outdoor air cooled
E Heat recovery
Y Y=Single or multi module
Q Refrigerant R410A
18 Capacity class
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
M=Multi module only
Installer and user reference guide
9
4 About the units and options
k
e
c
k l
e
e e
f h
b
a
k
l
c c
kkk
j
c
e
i
k
k
c
d
1
3
2
5
4
e
g
c
▪ VRV direct expansion (DX) indoor units (air-to-air applications).
▪ HT (high temperature) Hydrobox (air-to-water applications): HXHD
series (heating only).
▪ LT (low temperature) Hydrobox (air-to-water applications):
HXY080/125 series.
▪ AHU (air-to-air applications): EKEXV-kit+EKEQM-box required,
depending on the application.
▪ Comfort air curtain (air-to-air applications): CYVS (Biddle) series.
4.5.3 Possible combinations of outdoor units
Possible standalone outdoor units
Non-continuous heating
REYQ8
REYQ10
REYQ12
REYQ14
REYQ16
REYQ18
REYQ20
Possible standard combinations of outdoor units
▪ REYQ10~54 consist of 2 or 3 REYQ8~20 or REMQ5 units.
▪ REMQ5 units cannot be used as standalone outdoor units.
Continuous heating
REYQ10 = REMQ5 + 5
REYQ13 = REYQ8 + REMQ5
REYQ16 = REYQ8 + 8
a Outdoor unit
b Refrigerant piping
c BS unit
d Multi BS unit
e VRV DX indoor unit
f LT Hydrobox unit
g Cooling only VRV indoor unit
h HT Hydrobox unit
i EKEXV kit
j AHU
k User interface
l Wireless user interface
4.5 Combining units and options
4.5.1 About combining units and options
The VRV IV heat recovery system can be combined with several
types of indoor units and is intended for R410A use only.
For an overview which units are available you can consult the
product catalogue for VRV IV.
An overview is given indicating the allowed combinations of indoor
units and outdoor units. Not all combinations are allowed. They are
subject to rules (combination between outdoor-indoor, single outdoor
unit use, multiple outdoor unit use, combinations between indoor
units, etc.) mentioned in the technical engineering data.
NOTICE
To be sure your system setup (outdoor unit+indoor unit(s))
will work, you have to consult the latest technical
engineering data for VRV IV heat recovery.
REYQ18 = REYQ8 + 10
REYQ20 = REYQ8 + 12
REYQ22 = REYQ10 + 12
REYQ24 = REYQ8 + 16
REYQ26 = REYQ12 + 14
REYQ28 = REYQ12 + 16
REYQ30 = REYQ12 + 18
REYQ32 = REYQ16 + 16
REYQ34 = REYQ16 + 18
REYQ36 = REYQ16 + 20
REYQ38 = REYQ8 + 12 + 18
REYQ40 = REYQ10 + 12 + 18
REYQ42 = REYQ10 + 16 + 16
REYQ44 = REYQ12 + 16 + 16
REYQ46 = REYQ14 + 16 + 16
REYQ48 = REYQ16 + 16 + 16
REYQ50 = REYQ16 + 16 + 18
REYQ52 = REYQ16 + 18 + 18
REYQ54 = REYQ18 + 18 + 18
4.5.4 Possible options for the outdoor unit
INFORMATION
Refer to the technical engineering data for the latest option
names.
4.5.2 Possible combinations of indoor units
In general following type of indoor units can be connected to a VRV
IV heat recovery system. The list is non-exhaustive and is depending
on both outdoor unit model and indoor unit model combinations.
Installer and user reference guide
10
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
5 Preparation
b
c
f
d
d
a
c
b e
(mm)
≥1500
≥1000
≥1000
≥1000
≥1500
≥1500
≥1500
Refrigerant branching kit
Description Model name
Refnet header KHRQ23M29H
KHRQ23M64H
KHRQ23M75H
Refnet joint KHRQ23M20T
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
For the selection of the optimal branching kit, please refer to
"5.3.3To select refrigerant branch kits"on page15.
Outdoor multi connection piping kit
Number of outdoor units Model name
2 BHFQ23P907
3 BHFQ23P1357
PC configurator cable (EKPCCAB)
For VRV IV heat recovery system it is also possible to make several
commissioning field settings through a personal computer interface.
For this option EKPCCAB is required which is a dedicated cable to
communicate with the outdoor unit. The user interface software is
available on http://www.daikineurope.com/support-and-manuals/
software-downloads/.
Heater tape kit
To keep the drain holes free in cold climates with high humidity, you
can install a heater tape kit.
Description Model name
Heater tape kit for 5~12 HP EKBPH012T
Heater tape kit for 14~20 HP EKBPH020T
See also: "5.2.2 Additional installation site requirements of the
outdoor unit in cold climates"on page12.
Demand PCB (EKRP1AHTA)
To enable the power saving consumption control by digital inputs
you must install the demand PCB.
For installation instructions, see the installation manual of the
demand PCB and addendum book for optional equipment.
▪ Make sure the area is well ventilated. Do NOT block any
ventilation openings.
▪ Make sure the unit is level.
▪ Select a place where rain can be avoided as much as possible.
▪ Select the location of the unit in such a way that the sound
generated by the unit does not disturb anyone, and the location is
selected according the applicable legislation.
Do NOT install the unit in the following places:
▪ In potentially explosive atmospheres.
▪ In places where there is machinery that emits electromagnetic
waves. Electromagnetic waves may disturb the control system,
and cause malfunction of the equipment.
▪ In places where there is a risk of fire due to the leakage of
flammable gases (example: thinner or gasoline), carbon fibre,
ignitable dust.
▪ In places where corrosive gas (example: sulphurous acid gas) is
produced. Corrosion of copper pipes or soldered parts may cause
the refrigerant to leak.
▪ In places where a mineral oil mist, spray or vapour may be
present in the atmosphere. Plastic parts may deteriorate and fall
off or cause water leakage.
NOTICE
This is a class A product. In a domestic environment this
product may cause radio interference in which case the
user may be required to take adequate measures.
NOTICE
The equipment described in this manual may cause
electronic noise generated from radio-frequency energy.
The equipment complies to specifications that are
designed to provide reasonable protection against such
interference. However, there is no guarantee that
interference will not occur in a particular installation.
It is therefore recommended to install the equipment and
electric wires keeping proper distances away from stereo
equipment, personal computers, etc.
5 Preparation
5.1 Overview: Preparation
This chapter describes what you have to do and know before going
on-site.
It contains information about:
▪ Preparing the installation site
▪ Preparing the electrical wiring
5.2 Preparing the installation site
5.2.1 Installation site requirements of the outdoor unit
▪ Provide sufficient space around the unit for servicing and air
circulation.
▪ Make sure the installation site withstands the unit's weight and
vibration.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
a Personal computer or radio
b Fuse
c Earth leakage protector
d User interface
e Indoor unit
f Outdoor unit
In places with weak reception, keep distances of 3 m or more to
avoid electromagnetic disturbance of other equipment and use
conduit tubes for power and transmission lines.
CAUTION
Appliance not accessible to the general public, install it in a
secured area, protected from easy access.
This unit, both indoor and outdoor, is suitable for
installation in a commercial and light industrial
environment.
▪ When installing, take strong winds, typhoons or earthquakes into
account, improper installation may result in the unit turning over.
Installer and user reference guide
11
5 Preparation
b
c
a
a
b
c
d
c
d
T
AO
(°C WB)
a b
20
15.5
15
10
5
0
–5
–10
–15
–20
10 15 20 25
27
30
T
AI
(°C DB)
▪ Take care that in the event of a water leak, water cannot cause
any damage to the installation space and surroundings.
▪ When installing the unit in a small room, take measures in order to
keep the refrigerant concentration from exceeding allowable
safety limits in the event of a refrigerant leak, refer to "About
safety against refrigerant leaks"on page13.
CAUTION
Excessive refrigerant concentrations in a closed room can
lead to oxygen deficiency.
▪ Be sure that the air inlet of the unit is not positioned towards the
main wind direction. Frontal wind will disturb the operation of the
unit. If necessary, use a screen to block the wind.
▪ Ensure that water cannot cause any damage to the location by
adding water drains to the foundation and prevent water traps in
the construction.
Seaside installation. Make sure the outdoor unit is NOT directly
exposed to sea winds. This is to prevent corrosion caused by high
levels of salt in the air, which might shorten the life of the unit.
Install the outdoor unit away from direct sea winds.
Example: Behind the building.
INFORMATION
For instructions on how to install the snow cover, contact
your dealer.
NOTICE
When installing the snow cover, do NOT obstruct the air
flow of the unit.
If the outdoor unit is exposed to direct sea winds, install a
windbreaker.
▪ Height of windbreaker≥1.5×height of outdoor unit
▪ Mind the service space requirements when installing the
windbreaker.
a Sea wind
b Building
c Outdoor unit
d Windbreaker
5.2.2 Additional installation site requirements of the outdoor unit in cold climates
NOTICE
When operating the unit in a low outdoor ambient
temperature, be sure to follow the instructions described
below.
▪ To prevent exposure to wind and snow, install a baffle plate on the
air side of the outdoor unit:
In heavy snowfall areas it is very important to select an installation
site where the snow will NOT affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is NOT affected by
the snow. If necessary, install a snow cover or shed and a pedestal.
Installer and user reference guide
12
NOTICE
When operating the unit in a low outdoor ambient
temperature with high humidity conditions, make sure to
take precautions to keep the drain holes of the unit free by
using proper equipment.
In heating:
a Warming up operation range
b Operation range
TAI Ambient indoor temperature
TAO Ambient outdoor temperature
If the unit has to operate for 5 days in this area with
high humidity (>90%), Daikin recommends to install the
optional heater tape kit (EKBPH012T or EKBPH020T) to
keep the drain holes free.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
5 Preparation
b
a
a
b
5.2.3 Securing safety against refrigerant leaks
About safety against refrigerant leaks
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.
This system uses R410A as refrigerant. R410A itself is an entirely
safe non-toxic, non-combustible refrigerant. Nevertheless care must
be taken to ensure that the system is installed in a room which is
sufficiently large. This assures that the maximum concentration level
of refrigerant gas is not exceeded, in the unlikely event of major leak
in the system and this in accordance to the local applicable
regulations and standards.
About the maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is kg/m3 (the weight in
kg of the refrigerant gas in 1m3 volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
According to the appropriate European Standard, the maximum
allowed concentration level of refrigerant to a humanly space for
R410A is limited to 0.44kg/m3.
D When there are no smaller room divisions:
E When there is a room division that has an opening
sufficiently large to permit free air flow.
a Opening between the rooms. In case there is a door
the openings above and below the door each must be
equivalent in size to 0.15% or more of the floor area.
b Room division
3 Calculate the refrigerant density using the results of the
calculations in steps 1 and 2 above. If the result of the above
calculation exceeds the maximum concentration level, a
ventilation opening to the adjacent room shall be made.
a Direction of the refrigerant flow
b Room where refrigerant leak has occurred (outflow of all
the refrigerant from the system)
Pay special attention to places, such as basements etc., where
refrigerant can stay, since refrigerant is heavier than air.
To check the maximum concentration level
Check the maximum concentration level in accordance with steps 1
to 4 below and take whatever action is necessary to comply.
1 Calculate the amount of refrigerant (kg) charged to each system
separately.
Formula A+B=C
A Amount of refrigerant in a single unit system
B Additional charging amount (amount of
C Total amount of refrigerant (kg) in the
NOTICE
Where a single refrigerant facility is divided into 2 entirely
independent refrigerant systems, use the amount of
refrigerant with which each separate system is charged.
2 Calculate the volume of the room (m3) where the indoor unit is
installed. In a case such as the following, calculate the volume
of (D), (E) as a single room or as the smallest room.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
(amount of refrigerant with which the system
is charged before leaving the factory)
refrigerant added locally)
system
Formula F/G≤H
F Total volume of refrigerant in the refrigerant
system
G Size (m3) of smallest room in which there is
an indoor unit installed
H Maximum concentration level (kg/m3)
4 Calculate the refrigerant density taking the volume of the room
where the indoor unit is installed and the adjacent room. Install
ventilation openings in the door of adjacent rooms until the
refrigerant density is smaller than the maximum concentration
level.
5.3 Preparing refrigerant piping
5.3.1 Refrigerant piping requirements
NOTICE
The refrigerant R410A requires strict cautions for keeping
the system clean, dry and tight.
▪ Clean and dry: foreign materials (including mineral oils
or moisture) should be prevented from getting mixed
into the system.
▪ Tight: R410A does not contain any chlorine, does not
destroy the ozone layer, and does not reduce earth's
protection against harmful ultraviolet radiation. R410A
can contribute slightly to the greenhouse effect if it is
released. Therefore pay special attention to check the
tightness of the installation.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30mg/10m.
Installer and user reference guide
13
5 Preparation
C
A
B
D E
C C
E
a
b
x
y
43
1 2
a
e
b
c
d
▪ Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
Pipe Ø Temper grade of piping material
≤15.9mm O (annealed)
≥19.1mm 1/2H (half hard)
▪ All piping lengths and distances have been taken into
consideration (see "5.3.4About the piping length"on page15).
Only use phosphoric acid deoxidised seamless copper.
5.3.2 To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).
1,2 VRVDX indoor unit
3 BS unit
4 Cooling-only VRV indoor unit
A~E Piping
a,b Indoor branch kit
x,y Outdoor multi connection kit
Indoor unit capacity
index
<150 9.5 15.9 12.7
150≤x<200 19.1 15.9
200≤x<290 22.2 19.1
290≤x<420 12.7 28.6
420≤x<640 15.9 28.6
640≤x<920 19.1 34.9
≥920 41.3
Example:
▪ Downstream capacity for E=[capacity index of unit 1]
▪ Downstream capacity for D=[capacity index of unit 1]+[capacity
index of unit 2]
Piping outer diameter size (mm)
Liquid pipe Suction gas
pipe
High
pressure/low
pressure gas
pipe
E: Piping between refrigerant branch kit or BS unit and indoor unit
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit (in case indoor unit is VRVDX
indoor or Hydrobox).
Indoor unit capacity
index
15~50 12.7 6.4
63~140 15.9 9.5
200 19.1
250 22.2
▪ If a size-up of the piping is required, refer to the table below.
Piping outer diameter size (mm)
Gas pipe Liquid pipe
A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit
capacity type (HP)
5~8 9.5 19.1 15.9
10 9.5 22.2 19.1
12 12.7 28.6 19.1
14~16 12.7 28.6 22.2
18 15.9 28.6 22.2
20~22 15.9 28.6 28.6
24 15.9 34.9 28.6
26~34 19.1 34.9 28.6
36 19.1 41.3 28.6
38~54 19.1 41.3 34.9
Piping outer diameter size (mm)
Liquid pipe Suction gas
pipe
D: Piping between refrigerant branch kits or refrigerant branch kit and BS unit
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
Installer and user reference guide
14
High
pressure/low
pressure gas
pipe
a Outdoor unit
b Main pipes
c Increase
d First refrigerant branch kit
e Indoor unit
Size up
HP class Liquid piping outer diameter size (mm)
5~8 9.5 → 12.7
10
12+14 12.7 → 15.9
16
18~22 15.9 → 19.1
24
26~34 19.1 → 22.2
36~54
▪ The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Pipe Ø (mm) Minimal thickness t (mm)
6.4/9.5/12.7 0.80
15.9 0.99
19.1/22.2 0.80
28.6 0.99
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
5 Preparation
Pipe Ø (mm) Minimal thickness t (mm)
34.9 1.21
41.3 1.43
▪ In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch tomm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "6.7.3 To determine the additional refrigerant
amount"on page28.
5.3.3 To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to "5.3.2 To select the piping size" on
page14.
▪ When using refnet joints at the first branch counted from the
outdoor unit side, choose from the following table in accordance
with the capacity of the outdoor unit (example: refnet joint a).
Outdoor unit capacity type
(HP)
8~10 KHRQ23M29T9
12~22 KHRQ23M64T
24~54 KHRQ23M75T
▪ For refnet joints other than the first branch (example refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Indoor unit capacity index 3 pipes
<200 KHRQ23M20T
200≤x<290 KHRQ23M29T9
290≤x<640 KHRQ23M64T
≥640 KHRQ23M75T
▪ Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index 3 pipes
<200 KHRQ23M29H
200≤x<290
290≤x<640 KHRQ23M64H
≥640 KHRQ23M75H
(a) If the pipe size above the refnet header is Ø34.9 or more,
KHRQ23M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose
from the following table in accordance with the number of outdoor
units.
3 pipes
(a)
5.3.4 About the piping length
Make sure the piping installation does not exceed the maximum
allowable pipe length, the allowable level difference, and the
allowable length after branching. To illustrate the piping length
requirements, 6 cases are discussed in the chapters below. They
describe both standard and non-standard outdoor unit combinations
with VRV DX indoor units, Hydrobox units and/or air handling units
(AHU).
Definitions
Term Definition
Actual piping length Pipe length between outdoor and
indoor units
Equivalent piping length Pipe length between outdoor and
indoor units, including the
equivalent length of the piping
accessories
Total piping length Total piping length, from the
outdoor to all indoor units
Equivalent length of the piping accessories
Accessory Equivalent length
Refnet joint 0.5m
Refnet header 1m
Single BS1Q100~160 4m
Single BS1Q25 6m
Multi BS4~16Q14 4m
Allowable height difference
Term Definition Height difference
(m)
H1 Height difference
between outdoor and
indoor units
H2 Height difference
between indoor units
H3 Height difference
between outdoor
units
H4 Height difference
between EKEXV‑kits
and AHU units.
(a) If single outdoor units or standard multi-outdoor
combinations >20HP are connected to only VRV DX
indoor units, then the height difference between indoor
units (=H2) can be increased from 15 to 30m. However,
this limits the allowable maximum length of the longest pipe
(see "Connection with only VRV DX indoor units"on
page16).
(b) The allowable height difference is 50m in case the outdoor
unit is positioned higher than the indoor unit, and 40m in
case the outdoor unit is positioned lower than the indoor
unit. If only VRV DX indoor units are used, the allowable
height difference between outdoor and indoor units may be
extended to 90m, without the need of an additional option
kit. In this case, make sure all conditions below are met:
50/40
15
30
5
5
(b)
(a)
Number of outdoor units Branch kit name
2 BHFQ23P907
3 BHFQ23P1357
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
15
5 Preparation
H3
1 5
H1
H2
3 2
4
a
b b
c
d
e
e
H3
1 2
H1
H2
3 5
4
a
b
b
c
d
e
If Then
The outdoor unit is positioned
higher than the indoor units
▪ Minimum connection ratio:
80%
▪ Size up the liquid piping (refer
to "5.3.2 To select the piping
size" on page 14 for more
information)
▪ Activate the outdoor unit
setting. Refer to the service
manual for more information.
The outdoor unit is positioned
lower than the indoor units
▪ Minimum connection ratio
varies according to the height
difference between outdoor
and indoor units:
▪ 40~60m: 80%
▪ 60~65m: 90%
▪ 65~80m: 100%
▪ 80~90m: 110%
▪ Size up the liquid piping (refer
to "5.3.2 To select the piping
size" on page 14 for more
information)
▪ Activate the outdoor unit
setting. Refer to the service
manual for more information.
▪ No technical cooling
5.3.5 Single outdoor units and standard multioutdoor-unit combinations >20 HP
Pipe Maximum length (actual/
equivalent)
Longest pipe after the first
40m/—
(c)
branch (2, 3, 5)
In case of a multi-outdoor setup:
10m/13m
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 1000m/—
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
piping size"on page14.
(b) If the height difference between indoor units (=H2) is
between 15 and 30m, then the allowable maximum length
of the longest pipe is limited to 120/165m (actual/
equivalent).
(c) An extension up to 90m is possible if all of the following
conditions are met:
1 In case of BS1Q units, the piping length between all indoor
units and the nearest branch kit is ≤40m.
2 In case of multi BS units, the piping length between all indoor
units and the multi BS unit is ≤40m.
3 It is required to size up the liquid piping between the first branch
kit and the last. Beware that in contrast to multi BS units, BS1Q
units are NOT considered branch kits. If the increased pipe size
is larger than the pipe size of the main pipe, also increase the
size of the main pipe.
4 After sizing up the liquid piping (previous condition), double its
length in the calculation of the total piping length. Make sure the
total piping length is within limitations.
5 The piping length difference between the nearest indoor unit to
the outdoor unit and the farthest indoor unit to the outdoor unit
is ≤40m.
Connection with only VRV DX indoor units
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d BS unit
e VRV DX indoor unit
Longest pipe from the outdoor
unit or the last multi-outdoor
piping branch (1+2, 1+3, 1+5)
Installer and user reference guide
16
Pipe Maximum length (actual/
equivalent)
165m/190m
120m/165m
Connection with VRV DX indoor units and Hydrobox units
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d LT Hydrobox unit
e HT Hydrobox unit
(a)
(b)
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
5 Preparation
H3
1 2
H1
H2
H4
3
4
a
b
b
b
c
d
e
d
e
f
f
5
H3
1 5
H1
H2
3 2
4
a
b b
c
d
e
e
Pipe Maximum length (actual/
equivalent)
Longest pipe from the outdoor
135m/160m
(a)
unit or the last multi-outdoor
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
40m
branch (2, 3, 5)
In case of a multi-outdoor setup:
10m/13m
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 300m/600m
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
piping size"on page14.
(b) In this case, both are actual piping lengths: outdoor units
≤20HP / outdoor units >20HP.
(b)
Connection with VRV DX indoor units and air handling units
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
piping size"on page14.
5.3.6 Standard multi-outdoor-unit combinations ≤20 HP and free multi-outdoor-unit combinations
Connection with only VRV DX indoor units
a Outdoor unit
b VRV DX indoor unit
Longest pipe from the outdoor
unit or the last multi-outdoor
c Multi BS unit
d BS unit
e EKEXV kit
f AHU
Pipe Maximum length (actual/
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
branch (2, 3, 5)
In case of a multi-outdoor setup:
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 1000m/—
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
equivalent)
165m/190m
40m/—
10m/13m
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d BS unit
e VRV DX indoor unit
Pipe Maximum length (actual/
equivalent)
Longest pipe from the outdoor
135m/160m
(a)
unit or the last multi-outdoor
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
40m/—
(b)
branch (2, 3, 5)
In case of a multi-outdoor setup:
10m/13m
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 500m/—
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
piping size"on page14.
(a)
Installer and user reference guide
17
5 Preparation
H3
1 2
H1
H2
3 5
4
a
b
b
c
d
e
H3
1 2
H1
H2
H4
3
4
a
b
b
b
c
d
e
d
e
f
f
5
a
b
b
a
b
a
a
b
(b) An extension up to 90m is possible if all of the following
conditions are met:
1 In case of BS1Q units, the piping length between all indoor
units and the nearest branch kit is ≤40m.
2 In case of multi BS units, the piping length between all indoor
units and the multi BS unit is ≤40m.
3 It is required to size up the liquid piping between the first branch
kit and the last. Beware that in contrast to multi BS units, BS1Q
units are NOT considered branch kits. If the increased pipe size
is larger than the pipe size of the main pipe, also increase the
size of the main pipe.
4 After sizing up the liquid piping (previous condition), double its
length in the calculation of the total piping length. Make sure the
total piping length is within limitations.
5 The piping length difference between the nearest indoor unit to
the outdoor unit and the farthest indoor unit to the outdoor unit
is ≤40m.
Connection with VRV DX indoor units and Hydrobox units
Connection with VRV DX indoor units and air handling units
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d LT Hydrobox unit
e HT Hydrobox unit
Pipe Maximum length (actual/
Longest pipe from the outdoor
unit or the last multi-outdoor
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
branch (2, 3, 5)
In case of a multi-outdoor setup:
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 300m/500m
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
piping size"on page14.
(b) In this case, both are actual piping lengths: outdoor units
≤20HP / outdoor units >20HP.
equivalent)
135m/160m
10m/13m
40m/—
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d BS unit
e EKEXV kit
f AHU
Pipe Maximum length (actual/
equivalent)
Longest pipe from the outdoor
135m/160m
(a)
unit or the last multi-outdoor
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
40m/—
branch (2, 3, 5)
In case of a multi-outdoor setup:
10m/13m
longest pipe from the outdoor
unit to the last multi-outdoor
piping branch (4)
Total pipe length 500m/—
(a) If the equivalent piping length is more than 90m, size up
the main liquid piping according to "5.3.2To select the
(a)
piping size"on page14.
5.3.7 Multiple outdoor units: Possible layouts
▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1
(b)
Pattern 2
Installer and user reference guide
18
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
a
b
b
a
a To indoor unit
a
b b b
a
b b b
a
b
a
b
a
b
a
a
a
≥200 mm
a
b
≤2 m
a
≤2 m ≤2 m
≥200 mm
≥200 mm
b
>2 m >2 m
A B C
a b c
b Piping between outdoor units
X Not allowed (oil remains in piping)
O Allowed
▪ To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between outdoor
units as shown in the 4 correct possibilities of the figure below.
a To indoor unit
b Oil collects to the outmost outdoor unit when the system
stops
X Not allowed
O Allowed
▪ If the piping length between the outdoor units exceeds 2m, create
a rise of 200 mm or more in the suction gas line and the high
pressure/low pressure gas line within a length of 2m from the kit.
If Then
≤2m
5 Preparation
NOTICE
There are restrictions on the refrigerant pipe connection
order between outdoor units during installation in case of a
multiple outdoor unit system. Install according to following
restrictions. The capacities of outdoor units A, B and C
must fulfill the following restriction conditions: A≥B≥C.
a To indoor units
b Outdoor unit multi connecting piping kit (first branch)
c Outdoor unit multi connecting piping kit (second branch)
5.4 Preparing electrical wiring
5.4.1 About electrical compliance
This equipment complies with:
▪ EN/IEC 61000‑3‑11 provided that the system impedance Z
less than or equal to Z
at the interface point between the user's
max
supply and the public system.
▪ EN/IEC 61000‑3‑11 = European/International Technical
Standard setting the limits for voltage changes, voltage
fluctuations and flicker in public low-voltage supply systems for
equipment with rated current ≤75A.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a system impedance Z
less than or equal to Z
sys
max
▪ EN/IEC 61000‑3‑12 provided that the short-circuit power Ssc is
greater than or equal to the minimum Ssc value at the interface
point between the user's supply and the public system.
▪ EN/IEC 61000‑3‑12 = European/International Technical
Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input
current >16A and ≤75A per phase.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a short-circuit power Ssc greater than or equal to the
minimum Ssc value.
is
sys
.
>2m
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
a To indoor unit
b Piping between outdoor units
Non-continuous heating
Model Z
(Ω) Minimum S
max
value (kVA)
REMQ5 — 1216
REYQ8 — 1216
REYQ10 — 564
REYQ12 — 615
REYQ14 — 917
REYQ16 — 924
REYQ18 — 873
REYQ20 — 970
Continuous heating
Model Z
(Ω) Minimum S
max
value (kVA)
REYQ10 — 2432
REYQ13 — 2432
REYQ16 — 2432
Installer and user reference guide
sc
sc
19
6 Installation
Continuous heating
Model Z
REYQ18 — 1780
REYQ20 — 1831
REYQ22 — 1179
REYQ24 — 2140
REYQ26 — 1532
REYQ28 — 1539
REYQ30 — 1488
REYQ32 — 1848
REYQ34 — 1797
REYQ36 — 1894
REYQ38 — 2704
REYQ40 — 2052
REYQ42 — 2412
REYQ44 — 2463
REYQ46 — 2765
REYQ48 — 2772
REYQ50 — 2721
REYQ52 — 2670
REYQ54 — 2619
INFORMATION
Multi units are standard combinations.
(Ω) Minimum S
max
value (kVA)
sc
5.4.2 Safety device requirements
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
For standard combinations
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
INFORMATION
Multi units are standard combinations.
Non-continuous heating
Model Minimum
circuit
ampacity
REMQ5 16.1A 20A
REYQ8 16.1A 20A
REYQ10 22.0A 25A
REYQ12 24.0A 32A
REYQ14 27.0A 32A
REYQ16 31.0A 40A
REYQ18 35.0A 40A
REYQ20 39.0A 50A
Recommended
fuses
Continuous heating
Model Minimum
circuit
ampacity
REYQ20 39.0A 50A
REYQ22 46.0A 63A
REYQ24 46.0A 63A
REYQ26 51.0A 63A
REYQ28 55.0A 63A
REYQ30 59.0A 80A
REYQ32 62.0A 80A
REYQ34 66.0A 80A
REYQ36 70.0A 80A
REYQ38 74.0A 100A
REYQ40 81.0A 100A
REYQ42 84.0A 100A
REYQ44 86.0A 100A
REYQ46 89.0A 100A
REYQ48 93.0A 125A
REYQ50 97.0A 125A
REYQ52 101.0A 125A
REYQ54 105.0A 125A
For all models:
▪ Phase and frequency: 3N~50Hz
▪ Voltage: 380~415V
▪ Transmission line section: 0.75~1.25 mm2, maximum length is
1000 m. If the total transmission wiring exceeds these limits, it
may result in communication error.
For non-standard combinations
Calculate the recommended fuse capacity.
Formula Calculate, by adding the minimum circuit amps of each
used unit (according to the table above), multiply the
result by 1.1 and select the next higher recommended
fuse capacity.
Example Combining the REYQ30 by using the REYQ8,
REYQ10, and REYQ12.
▪ Minimum circuit ampacity of the REYQ8=16.1A
▪ Minimum circuit ampacity of the REYQ10=22.0A
▪ Minimum circuit ampacity of the REYQ12=24.0A
Accordingly, the minimum circuit ampacity of the
REYQ30=16.1+22.0+24.0=62.1A
Multiply the above result by 1.1 ⇒ (62.1A×1.1)=68.3A,
so the recommended fuse capacity would be 80A.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
Recommended
fuses
Continuous heating
Model Minimum
circuit
ampacity
REYQ10 30.0A 40A
REYQ13 30.0A 40A
REYQ16 30.0A 40A
REYQ18 37.0A 50A
Installer and user reference guide
Recommended
fuses
20
6 Installation
6.1 Overview: Installation
This chapter describes what you have to do and know on-site to
install the system.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Typical workflow
14×14×
5~12 HP 14~20 HP
5~12 HP
2×
SW8
14~20 HP
6×
SW8
a
b
c
d
e
≥100 mm
≥100 mm
*
Installation typically consists of the following stages:
1 Mounting the outdoor unit
2 Connecting the refrigerant piping
3 Checking the refrigerant piping
4 Insulating the refrigerant piping
5 Charging refrigerant
6 Connecting the electrical wiring
6.2 Opening the units
6.2.1 To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
To gain access to the unit, front plates need to be opened as follows:
6 Installation
NOTICE
When closing the electrical component box cover, make
sure that the sealing material on the lower back side of the
cover is NOT caught and bend towards the inside.
a Electrical component box cover
b Front side
c Power supply terminal block
d Sealing material
e Moisture and dirt could enter
X Not allowed
O Allowed
Once the front plates open, the electrical component box can be
accessed. See "6.2.2 To open the electrical component box of the
outdoor unit"on page21.
For service purposes, the pushbuttons on the main PCB need to be
accessed. To access these pushbuttons, the electrical component
box cover does not need to be opened. See "7.2.3To access the
field setting components"on page38.
6.2.2 To open the electrical component box of the outdoor unit
NOTICE
Do NOT apply excessive force when opening the
electronic component box cover. Excessive force can
deform the cover, resulting in entering of water to cause
equipment failure.
6.3 Mounting the outdoor unit
6.3.1 To provide the installation structure
Make sure the unit is installed level on a sufficiently strong base to
prevent vibration and noise.
NOTICE
▪ When the installation height of the unit needs to be
increased, do NOT use stands to only support the
corners.
▪ Stands under the unit must be at least 100mm wide.
X Not allowed
O Allowed (* = preferred installation)
▪ The height of the foundation must at least be 150 mm from the
floor. In heavy snowfall areas, this height should be increased,
depending on the installation place and condition.
▪ The preferred installation is on a solid longitudinal foundation
(steel beam frame or concrete). The foundation must be larger
than the grey marked area.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
21
6 Installation
729
≤613
≥929
≥AB
AA
a
(mm)
20 mm
a
a b
c
c
b
a
WARNING
Take sufficient precautions in case of refrigerant leakage. If
refrigerant gas leaks, ventilate the area immediately.
Possible risks:
▪ Excessive refrigerant concentrations in a closed room
can lead to oxygen deficiency.
▪ Toxic gas may be produced if refrigerant gas comes
into contact with fire.
Minimum foundation
a Anchor point (4×)
HP AA AB
5~12 766 992
14~20 1076 1302
▪ Fasten the unit in place using four foundation bolts M12. It is best
to screw in the foundation bolts until their length remains 20mm
above the foundation surface.
NOTICE
▪ Prepare a water drainage channel around the
foundation to drain waste water from around the unit.
During heating operation and when the outdoor
temperatures are negative, the drained water from the
outdoor unit will freeze up. If the water drainage is not
taken care of, the area around the unit might be very
slippery.
▪ When installed in a corrosive environment, use a nut
with plastic washer (a) to protect the nut tightening part
from rust.
WARNING
ALWAYS recover the refrigerant. Do NOT release them
directly into the environment. Use a vacuum pump to
evacuate the installation.
Only use phosphoric acid deoxidised seamless copper.
NOTICE
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak detection.
6.4.2 About connecting the refrigerant piping
Before connecting the refrigerant piping, make sure the outdoor and
indoor units are mounted.
Connecting the refrigerant piping involves:
▪ Routing and connecting the refrigerant piping to the outdoor unit
▪ Protecting the outdoor unit against contamination
▪ Connecting the refrigerant piping to the indoor units (see the
installation manual of the indoor units)
▪ Connecting the multi-connection piping kit
▪ Connecting the refrigerant branching kit
▪ Keeping in mind the guidelines for:
▪ Brazing
▪ Using the stop valves
▪ Removing the pinched pipes
6.4 Connecting the refrigerant piping
6.4.1 Precautions when connecting the refrigerant piping
NOTICE
Make sure refrigerant piping installation complies with
applicable legislation. In Europe, EN378 is the applicable
standard.
NOTICE
Make sure the field piping and connections are NOT
subjected to stress.
WARNING
During tests, NEVER pressurize the product with a
pressure higher than the maximum allowable pressure (as
indicated on the nameplate of the unit).
6.4.3 To route the refrigerant piping
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in the
figure below.
a Left-side connection
b Front connection
c Right-side connection
For side connections, the knockout hole on the bottom plate should
be removed:
a Large knockout hole
b Drill
c Points for drilling
Installer and user reference guide
22
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
6 Installation
1
1
1
1
2 2
≤Ø25.4 >Ø25.4
a
a
A B
7.5°
7.5°
>120 mm
>500 mm
A
B
±
3
0
°
a
b
c
a
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
6.4.4 To connect the refrigerant piping to the outdoor unit
INFORMATION
All local inter unit piping are field supplied except the
accessory pipes.
NOTICE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
▪ Make sure that the total length of the piping connected to the joint
is absolute straight for more than 500mm. Only if a straight field
piping of more than 120 mm is connected, more than 500 mm of
straight section can be ensured.
6.4.6 Multiple outdoor units: Knockout holes
Connection Description
Front connection Remove the front plate knockout holes to
connect.
Bottom connection Remove the knockout holes on the bottom
frame and route the piping under the bottom.
NOTICE
▪ Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
▪ Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel. Especially
for the bottom and side connection, be sure to protect
the piping with suitable insulation, to prevent it from
coming into contact with the casing.
Connect the stop valves to the field piping using the accessory pipes
supplied with the unit.
The connections to the branch kits are the responsibility of the
installer (field piping).
6.4.5 To connect the multi connection piping kit
NOTICE
Improper installation may lead to malfunction of the
outdoor unit.
▪ Install the joints horizontally, so that the caution label (a) attached
to the joint comes to the top.
▪ Do not tilt the joint more than 7.5° (see view A).
▪ Do not install the joint vertically (see view B).
a Caution label
X Not allowed
O Allowed
6.4.7 To connect the refrigerant branching kit
For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
▪ Mount the refnet joint so that it branches either horizontally or
vertically.
▪ Mount the refnet header so that it branches horizontally.
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
6.4.8 To protect against contamination
Protect the piping as described in the following table to prevent dirt,
liquid or dust from entering the piping.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
23
6 Installation
a
1
1
1
1
2 2
≤Ø25.4 >Ø25.4
a b c d e
f
f
c
d
a
b
a b
cde
1
2
3
4
Unit Installation period Protection method
Outdoor unit >1month Pinch the pipe
<1month Pinch or tape the pipe
Indoor unit Regardless of the
period
Seal the piping and wiring intake holes using sealing material (field
supply), otherwise the capacity of the unit will drop and small
animals may enter the machine.
Example: passing piping out through the front.
a Close the areas marked with " ". (When the piping is
routed from the front panel.)
▪ Only use clean pipes.
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent
dust and/or particles entering the pipe.
6.4.9 To braze the pipe end
NOTICE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
6.4.10 Using the stop valve and service port
To handle the stop valve
▪ Make sure to keep all stop valves open during operation.
▪ The figure below shows the name of each part required in
handling the stop valve.
▪ The stop valve is factory closed.
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
a Service port
b Stop valve cover
c Hexagon hole
d Shaft
e Seal
▪ When brazing, blow through with nitrogen to prevent creation of
large quantities of oxidised film on the inside of the piping. This
film adversely affects valves and compressors in the refrigerating
system and prevents proper operation.
▪ Set the nitrogen pressure to 20 kPa (0.2bar) (just enough so it
can be felt on the skin) with a pressure-reducing valve.
a Refrigerant piping
b Part to be brazed
c Taping
d Manual valve
e Pressure-reducing valve
f Nitrogen
▪ Do NOT use anti-oxidants when brazing pipe joints.
Residue can clog pipes and break equipment.
▪ Do NOT use flux when brazing copper-to-copper refrigerant
piping. Use phosphor copper brazing filler alloy (BCuP), which
does not require flux.
Flux has an extremely harmful influence on refrigerant piping
systems. For instance, if chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
deteriorate the refrigerant oil.
Installer and user reference guide
24
To open the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench into the stop valve and turn the stop
valve counterclockwise.
3 When the stop valve cannot be turned any further, stop turning.
Result: The valve is now open.
To fully open the Ø19.1 mm~Ø25.4 mm stop valve, turn the
hexagonal wrench until a torque between 27 and 33 N•m is
achieved.
Inadequate torque may cause leakage of refrigerant and breakage of
the stop valve cap.
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1~Ø25.4mm stop valves only.
To close the stop valve
1 Remove the stop valve cover.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
6 Installation
c
d
a
b
p<p
>
R410AN2
b c e
a
f
g
h
d
A
C D
B
2 Insert a hexagon wrench into the stop valve and turn the stop
valve clockwise.
3 When the stop valve cannot be turned any further, stop turning.
Result: The valve is now closed.
Closing direction:
To handle the stop valve cover
▪ The stop valve cover is sealed where indicated by the arrow. Do
NOT damage it.
▪ After handling the stop valve, tighten the stop valve cover
securely, and check for refrigerant leaks. For the tightening
torque, refer to the table below.
To handle the service port
▪ Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
▪ After handling the service port, make sure to tighten the service
port cover securely. For the tightening torque, refer to the table
below.
▪ Check for refrigerant leaks after tightening the service port cover.
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
2 Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
h High pressure/low pressure gas line stop valve
A Valve A
B Valve B
C Valve C
D Valve D
3 Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports
5 Cut off the lower part of the liquid-, gas-, and high pressure/low
pressure gas stop valve pipes along the black line. Use an
appropriate tool (e.g. a pipe cutter, a pair of nippers).
Tightening torques
Stop valve
size (mm)
Ø9.5 5.4~6.6 4mm 13.5~16.5 11.5~13.9
Ø12.7 8.1~9.9 18.0~22.0
Ø15.9 13.5~16.5 6mm 23.0~27.0
Ø19.1 27.0~33.0 8mm 22.5~27.5
Ø25.4
Tightening torque N•m (turn clockwise to close)
Shaft
Valve body Hexagonal
wrench
Cap (valve
lid)
Service
port
6.4.11 To remove the pinched pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1 Remove the valve cover and make sure that the stop valves are
fully closed.
WARNING
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
6 Wait until all oil is dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Installer and user reference guide
25
6 Installation
Refrigerant piping works are
finished?
The indoor units and/or
outdoor unit were already
powered ON?
Use procedure:
"Method 2: After power ON".
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
Yes
No
No
Yes
p<p
>
R410AN2
C D
b c e
a
g
h
f
d
A B
6.5 Checking the refrigerant piping
6.5.1 About checking the refrigerant piping
It is very important that all refrigerant piping work is done before the
units (outdoor or indoor) are powered on.
When the units are powered on, the expansion valves will initialise.
This means that they will close. Leak test and vacuum drying of field
piping and indoor units is impossible when this happens.
Therefore, there will be explained 2 methods for initial installation,
leak test and vacuum drying.
Method 1: Before power ON
If the system has not yet been powered on, no special action is
required to perform the leak test and the vacuum drying.
Method 2: After power ON
If the system has already been powered on, activate setting [2‑21]
(refer to "7.2.4 To access mode 1 or 2" on page39). This setting
will open field expansion valves to guarantee a R410A piping
pathway and make it possible to perform the leak test and the
vacuum drying.
NOTICE
Make sure that all indoor units connected to the outdoor
unit are powered on.
NOTICE
Wait until the outdoor unit has finished the initialisation to
apply setting [2‑21].
Leak test and vacuum drying
Checking the refrigerant piping involves:
▪ Checking for any leakages in the refrigerant piping.
▪ Performing vacuum drying to remove all moisture, air or nitrogen
in the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, water may have entered the piping), first carry
out the vacuum drying procedure below until all moisture has been
removed.
All piping inside the unit has been factory tested for leaks.
Only field installed refrigerant piping needs to be checked.
Therefore, make sure that all the outdoor unit stop valves are firmly
closed before performing leak test or vacuum drying.
NOTICE
Make sure that all (field supplied) field piping valves are
OPEN (not outdoor unit stop valves!) before you start leak
test and vacuuming.
Installer and user reference guide
26
For more information on the state of the valves, refer to
"6.5.3Checking refrigerant piping: Setup"on page26.
6.5.2 Checking refrigerant piping: General guidelines
Connect the vacuum pump through a manifold to the service port of
all stop valves to increase efficiency (refer to "6.5.3 Checking
refrigerant piping: Setup"on page26).
NOTICE
Use a 2-stage vacuum pump with a non-return valve or a
solenoid valve that can evacuate to a gauge pressure of
–100.7kPa (−1.007bar)(5Torr absolute).
NOTICE
Make sure the pump oil does not flow oppositely into the
system while the pump is not working.
NOTICE
Do not purge the air with refrigerants. Use a vacuum pump
to evacuate the installation.
6.5.3 Checking refrigerant piping: Setup
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
h High pressure/low pressure gas line stop valve
A Valve A
B Valve B
C Valve C
D Valve D
Valve State of valve
Valve A Open
Valve B Open
Valve C Open
Valve D Open
Liquid line stop valve Close
Gas line stop valve Close
High pressure/low pressure gas
Close
line stop valve
NOTICE
The connections to the indoor units and all indoor units
should also be leak and vacuum tested. Keep any possible
(field supplied) field piping valves open as well.
Refer to the indoor unit installation manual for more details.
Leak test and vacuum drying should be done before the
power supply is set to the unit. If not, see also the flow
chart earlier described in this chapter (see "6.5.1 About
checking the refrigerant piping"on page26).
6.5.4 To perform a leak test
The leak test must satisfy the specifications of EN378‑2.
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353997-1C – 2018.04
Loading...