This document is part of a documentation set. The complete set
consists of:
▪ General safety precautions:
▪ Safety instructions that you must read before installing
▪ Format: Paper (in the box of the outdoor unit)
▪ Outdoor unit installation and operation manual:
▪ Installation and operation instructions
▪ Format: Paper (in the box of the outdoor unit)
▪ Installer and user reference guide:
▪ Preparation of the installation, reference data,…
▪ Detailed step-by-step instructions and background information
for basic and advanced usage
▪ Format: Digital files on http://www.daikineurope.com/support-
and-manuals/product-information/
Latest revisions of the supplied documentation may be available on
the regional Daikin website or via your dealer.
The original documentation is written in English. All other languages
are translations.
Technical engineering data
▪ A subset of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The full set of latest technical data is available on the Daikin
extranet (authentication required).
For the installer
2About the box
2.1To 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
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
f Multilingual fluorinated greenhouse gases label
g Piping accessory bag
h Hose
i Water filter
2.2Accessory pipes: Diameters
Accessory pipes
(mm)
Liquid pipe
▪ Front connection
▪ Top connection
HPØaØbØcØd
812.712.712.79.5
(a)
10
1212.7
14
Installation and operation manual
5
3 About the units and options
Øa
Øb
Øc
Ød
Øa
Øb
Øc
Ød
2
2
3
5
1
(12.3 N·m)
Accessory pipes
(mm)
Gas pipe
▪ Front connection
▪ Top connection
High pressure/Low
pressure gas pipe
▪ Front connection
▪ Top connection
(a) Braze the straight accessory pipe onto the L-shaped
accessory pipe in order to get the correct diameter to
connect the field pipes (for front connection).
HPØaØbØcØd
825.425.425.419.1
(a)
1022.2
1228.6
14
825.425.425.415.9
1019.1
(a)
12
1422.2
2.3To remove the transportation stay
NOTICE
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
The compressor transportation stay must be removed. It is installed
under the compressor leg in order to protect the unit during
transport. Proceed as shown in the figure and procedure below.
1 Remove the bolt.
2 Lift the insulation to access the compressor mounting bolt.
3 Slightly loosen the mounting bolt.
4 Remove the transportation stay as shown in the figure below.
5 Tighten the mounting bolt to 12.3N•m of torque.
3About the units and options
3.1About the outdoor unit
This installation manual concerns the VRV IV water-cooled system
air conditioner. The unit is full inverter driven, and can be used for
cooling, heat pump and heat recovery applications.
Model line up:
ModelDescription
RWEYQ8~14Heat recovery model for single or multi-use
Depending on the chosen type of unit, 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 indoor installation and aimed for heat
pump applications including water to air and water to water
applications.
These units have (in single use) heating capacities ranging from 25
to 45 kW and cooling capacities ranging from 22.4 to 40kW. When
multi combination is used, the capacity can go up to 135 kW for
heating and 120kW for cooling.
The unit is designed to work in heating mode at indoor temperatures
from 15°C WB to 27°C WB and in cooling mode at indoor
temperatures from 21°CDB to 32°CDB or 14°CWB to 25°CWB.
The ambient temperature around the unit should be above 0°C DB
and below 40°C DB. Relative humidity around the unit should be
below 80%.
The water temperature at the water inlet of the unit must be between
10°C and 45°C. The lower limit is extendable down to –10°C
(heating operation mode) in case the brine type setting [2‑50] is set
for use with brine as heat source medium.
Installation and operation manual
6
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
4 Preparation
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3.2System layout
Heat recovery system
Water system
a Unit
b Connection to refrigerant system
c Water piping
d Dry cooler
e Brine loop
f Closed cooling tower
g Boiler
4Preparation
4.1Preparing installation site
4.1.1Installation site requirements of the
outdoor unit
Mind the spacing guidelines. See the "Technical data" chapter.
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
a 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
m Water system connection
Heat pump system
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
a Unit
b Refrigerant piping
c VRV DX indoor unit
d LT Hydrobox unit
e BP box (required to connect Residential Air (RA) or Sky Air
(SA) direct expansion (DX) indoor units)
f Residential Air (RA) direct expansion (DX) indoor units
g User interface
h Wireless user interface
i Cool/heat changeover remote control switch
j Water system connection
installation in a commercial and light industrial
environment.
NOTICE
This equipment is compliant with Class A of EN55032/
CISPR 32. In a residential environment this equipment
may cause radio interference.
4.2Preparing refrigerant piping
4.2.1Refrigerant piping requirements
NOTICE
Refrigerant R410A requires strict cautions for keeping the
system clean and dry. Foreign materials (including mineral
oils or moisture) should be prevented from getting mixed
into the system.
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.
▪ Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
Pipe ØTemper grade of piping material
≤15.9mmO (annealed)
≥19.1mm1/2H (half hard)
Installation and operation manual
7
4 Preparation
A
BBB
C
DF
G
E
x
y
b
a
3
1245
A
BBB
C
DE
E
x
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b
a
4
3
12
▪ All piping lengths and distances have been taken into
consideration (see About the piping length in the installer
reference guide).
▪ 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 ØMinimal thickness t
6.4mm/9.5mm/12.7mm0.80mm
15.9mm0.99mm
19.1mm/22.2mm0.80mm
28.6mm0.99mm
34.9mm1.21mm
41.3mm1.43mm
▪ 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 "5.6.3 To determine the additional refrigerant
amount"on page18.
4.2.2To select the piping size
INFORMATION
Please select the proper pipe sizes depending on the
mode of your system. There are 2 possible modes:
▪ heat pump,
▪ heat recovery.
Determine the proper size using the following tables and reference
figure (only for indication).
In case of heat pump mode
In case of heat recovery mode
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
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.
In case of heat pump mode
Outdoor unit
capacity type (HP)
819.19.5
1022.2
12~1628.612.7
18~2215.9
2434.9
26~3419.1
36~4241.3
Piping outer diameter size (mm)
Gas pipeLiquid pipe
1,2 VRVDX indoor unit
3 BP box
4,5 RADX indoor unit
a,b Indoor branch kit
x,y Outdoor multi connection kit
Installation and operation manual
8
In case of heat recovery mode
Outdoor unit
capacity type (HP)
5~89.519.115.9
1022.219.1
1212.728.6
14~1622.2
1815.9
20~2228.6
2434.9
26~3419.1
3641.3
38~4234.9
Piping outer diameter size (mm)
Liquid pipeSuction gas
pipe
High
pressure/low
pressure 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.
▪ 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)
Gas pipeLiquid pipe
Piping outer diameter size (mm)
Liquid pipeSuction gas
pipe
High
pressure/low
pressure gas
pipe
E: Piping between refrigerant branch kit or BS unit
and indoor unit
For heat pump mode and heat recovery mode
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit.
Indoor unit capacity
index
15~5012.76.4
63~14015.99.5
20019.1
25022.2
▪ If a size-up of the piping is required, refer to the table below.
Piping outer diameter size (mm)
Gas pipeLiquid pipe
Size up
HP classLiquid piping outer diameter size (mm)
18~2215.9 → 19.1
24
26~3419.1 → 22.2
36~42
F: Piping between refrigerant branch kit and BP
unit
Heat pump mode in case of single outdoor unit
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case RADX indoor
units are connected).
Total capacity index
of connected indoor
units
20~6212.76.4
63~14915.99.5
150~20819.1
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index
of unit 5]
Piping outer diameter size (mm)
Gas pipeLiquid pipe
G: Piping between BP unit and RA DX indoor unit
Heat pump mode in case of single outdoor unit
Only in case RADX indoor units are connected.
Indoor unit capacity
index
20, 25, 309.56.4
5012.7
609.5
7115.9
Piping outer diameter size (mm)
Gas pipeLiquid pipe
4.2.3To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to "4.2.2 To select the piping size" on
page8.
▪ 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).
(a) If the pipe size above the refnet header is Ø34.9mm or
more, KHRQ22M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose
from the following table in accordance with the number of outdoor
units.
Number of outdoor unitsBranch kit name
2BHFQ22P1007
3BHFQ22P1517
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
4.2.4Multiple 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.
IfThen
≤2m
>2m
a To indoor unit
b Piping between outdoor units
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)
4.3Preparing water piping
Pattern 1
a To indoor unit
b Piping between outdoor units
X Not allowed (oil remains in piping)
O Allowed
Pattern 2
▪ If the piping length between the outdoor unit connecting pipe kit or
between the outdoor units exceeds 2m, create a rise of 200mm
or more in the gas line within a length of 2m from the kit.
▪ For the gas piping (both discharge and suction gas piping in case
of the heat recovery system) after the branch, install a trap of
200 mm or more using the piping included in the piping kit for
connecting the outdoor unit. Otherwise, the refrigerant may stay in
the piping, causing damage to the outdoor unit.
Installation and operation manual
10
4.3.1Water circuit requirements
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
▪ Connecting piping – Legislation. Make all piping connections in
accordance with the applicable legislation and the instructions in
the "Installation" chapter, respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when
connecting the piping. Deformation of the piping can cause
malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to
handle brass, which is a soft material. If NOT, pipes will get
damaged.
▪ Connecting piping – Stainless steel. Only use stainless steel
material to connect the water piping to the unit. If NOT, pipes will
get corroded. Take preventive measures, for example by
insulating the connection on the water pipe.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust
gets into the circuit, problems may occur. To prevent this:
▪ 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.
▪ Use a decent thread sealant to seal connections.
▪ Piping work – Dripping. The outdoor unit is intended for indoor
installation. Carry out piping work in such a way that no water
drips on the outdoor unit.
▪ Outlets. Do NOT connect the drain outlet to the water outlet.
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
4 Preparation
≥80 mm
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▪ Filter. Install the filter in the water piping inlet within a distance of
1.5 m from the outdoor unit. If sand, waste or rust particles are
mixed in the water circulation system, metal materials will become
corroded.
▪ Insulation. Insulate up to the base of the heat exchanger.
▪ Scale can stick to the plate heat exchanger depending on water
quality. To remove scale, cleaning is necessary at regular
intervals using chemicals. Install a shut-off valve at the end in the
water piping. Install a piping connection port on the piping
between this shut-off valve and the outdoor unit for cleaning by
chemicals.
▪ For cleaning and water draining of the outdoor unit (long period of
non-use or during non-use in winter), install an air purge plug (for
joint use with cleaning port) (field supply) and a water draining
plug at the inlet/outlet ports of the water piping. Additionally, install
an automatic air purge valve (field supply) at the top of rising
piping or at the top of a portion where air tends to stay.
▪ Install an additional cleanable filter (field supply) in front of the
pump inlet.
a Air purge (field supply)
b Water outlet
c Water inlet
d Shut-off valve (field supply)
e Water connection
f Water piping (field supply)
g Insulation (field supply)
h Heat exchanger
i Filter (accessory)
j Drain valve (field supply)
k Drain connection
l Insulation cover
▪ Water pump. After filling the water piping, run the water pump
(field supply) to flush the water piping. After flushing, clean the
▪ Carry out complete cooling/thermal insulation of the water piping
and the outdoor unit drain piping. If insulation has not been carried
out, the unit may sustain damage during severe winters due to
freezing, in addition to thermal loss.
▪ When you stop the unit during night or winter, take measures to
prevent water circuits from natural freezing in areas where the
ambient temperature drops below 0°C (by water drain off, keeping
the circulation pump running, warming up by a heater,…).
Freezing of water circuits may result in damage to the plate heat
exchanger. Therefore, take appropriate measures depending on
the circumstances.
filter.
▪ Freeze. Protect against freezing.
▪ Water pipes. ALWAYS comply with local and national regulations.
▪ Water piping – Tightening torque. Securely tighten the water
piping with a tightening torque of ≤300N•m. Overtightening results
in damage to the unit.
▪ Field supply components – Water. Only use materials that are
compatible with water used in the system and with the materials
used in the outdoor unit.
▪ Field supply components – Water pressure and temperature.
Check that all components in the field piping can withstand the
water pressure and water temperature.
▪ Water pressure. The maximum water pressure is 37bar. Provide
adequate safeguards in the water circuit to ensure that the
a Water inlet piping
b Filter (accessory)
c Air purge plug (for joint use with cleaning port) (field
supply)
d Cleaning device
e Filter for pump (field supply)
f Automatic air purge valve (field supply)
g Water outlet piping
h Joint use with water draining plug
i Plate heat exchanger
maximum pressure is NOT exceeded.
▪ Drainage – Low points. Provide drain taps at all low points of the
system in order to allow complete drainage of the water circuit.
▪ Drainage – Clogging. Make sure that the water runs smoothly
4.3.3About the water flow rate
The RWEYQ*T9Y1B models are equipped with the logic to operate
with a variable water flow rate function.
without any clogging by dirt.
▪ Drainage – Lateral length. Lateral length of drainage should be
as short as possible (≤400 mm) and installed in a downward
direction. The diameter of the drain pipe must be the same as the
diameter of the pipe on the outdoor unit.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
4.3.2Handling the brazed plate heat exchanger
INFORMATION
A brazed plate heat exchanger is used. Because of a
different structure from a conventional heat exchanger, it
MUST be handled in a different manner.
▪ Install a water filter at the water inlet in order to prevent foreign
materials such as dust, sand,… from entering the plate heat
exchanger.
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
A system can either be configured as a constant flow system (a), a
variable flow system with valve (b) or a variable flow system with a
pump (c).
▪ Constant flow system (a): the variable water flow rate function is
not used.
▪ A pressure independent flow regulating valve (b): the valve
controls the flow rate of a centralized inverter pump through the
unit.
▪ Inverter pump (c): the pump directly controls the water flow rate
through the unit.
a Constant flow
b Flow regulating valve (field supply)
c Inverter pump (field supply)
Installation and operation manual
11
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