instructions and
background information
for basic and advanced
usage
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.
For the installer
2About the box
2.1Outdoor unit
2.1.1To remove the accessories from the
outdoor unit
1 Remove the service cover. See "5.1.1 To open the outdoor
unit"on page9.
2 Remove the accessories.
a General safety precautions
b Outdoor unit installation and operation manual
c Fluorinated greenhouse gases label
d Installation information sticker
e Gas piping accessory 1 (8HP:Ø19.1mm;
10HP:Ø22.2mm; 12HP:Ø25.4mm)
f Gas piping accessory 2 (8HP:Ø19.1mm;
10HP:Ø22.2mm; 12HP:Ø25.4mm)
g Cable tie
2.1.2To remove the transportation stay
Only for RXYSQ10+12.
NOTICE
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
The yellow 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.
Installation and operation manual
6
VRV IV-S system air conditioner
RXYSQ8~12TMY1B
4P400263-1B – 2015.06
3 About the units and options
1
3 (12.3 N·m)3 (12.3 N·m)
2
2
1
a
b
g
dd
cc
f
eb
a
g
f
e
T
AO
(°C WB)
ab
20
15.5
15
10
5
0
–5
–10
–15
–20
10152025
27
30
T
AI
(°C DB)
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 (12.3N•m).
3About the units and options
3.1About the outdoor unit
This installation manual concerns the VRV IV-S, full inverter driven,
heat pump system.
These units are intended for outdoor installation and aimed for air to
air heat pump applications.
4Preparation
4.1Preparing installation site
4.1.1Installation site requirements of the
outdoor unit
Mind the spacing guidelines. See the "Technical data" chapter, and
the figures on the inside of the front cover.
4.1.2Additional installation site requirements
of the outdoor unit in cold climates
NOTICE
When operating the unit in heating 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:
SpecificationRXYSQ8~12
CapacityHeating25~37.5kW
Cooling22.4~33.5kW
Ambient design
temperature
Heating–20~15.5°CWB
Cooling–5~52°CDB
3.2System layout
NOTICE
Design of the system must not be done at temperatures
below –15°C.
a VRV IV-S Heat pump outdoor unit
b Refrigerant piping
c VRV direct expansion (DX) indoor unit
d User interface (dedicated depending on indoor unit type)
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 (wireless, dedicated depending on indoor
unit type)
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1B – 2015.06
a Warming up operation range
b Operation range
TAI Ambient indoor temperature
TAO Ambient outdoor temperature
If the unit is selected to operate at ambient temperatures
lower than –5°C for 5 days or longer, with relative humidity
levels exceeding 95%, we recommend to apply a Daikin
range specifically designed for such application and/or to
contact your dealer for further advice.
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.
Installation and operation manual
7
4 Preparation
t
Ø
A
B-1B-2
C-1C-2C-3C-4EEEE
11
3-13-23-33-4
A
D
RA DXVRV DX
D
4
4
5555
22
22
a
e
bc
d
▪ Foreign materials inside pipes (including oils for fabrication) must
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
4.2.3To select the piping size
Determine the proper size referring to following tables and reference
figure (only for indication).
INFORMATION
▪ Combination of VRVDX and RADX indoor units is not
allowed.
▪ Combination of RA DX and AHU indoor units is not
allowed.
▪ Combination of RADX and aircurtain indoor units is not
allowed.
INFORMATION
In case of RXYSQ8: If you install RADX indoor units, you
have to configure field setting [2‑41] (= type of installed
indoor units). See "6.1.8 Mode 2: Field settings" on
page22.
In case of RXYSQ10+12: The type of indoor units is
detected automatically.
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the following
into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "5.6.2 To determine the additional refrigerant
amount"on page15.
A: Piping between outdoor unit and (first)
refrigerant branch kit
When the equivalent pipe length between outdoor and indoor units is
90m or more, the size of the main pipes (both gas side and liquid
side) must be increased. Depending on the length of the piping, the
capacity may drop, but even in such a case the size of the main
pipes has to be increased. More specifications can be found in the
technical engineering data book.
a Outdoor unit
b Main pipes
c Increase
d First refrigerant branch kit
e Indoor unit
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Gas pipeLiquid pipe
Standard Size-up Standard Size-up
819.122.29.512.7
1022.225.4
(a)
1225.428.612.715.9
(a) If size is NOT available, increase is NOT allowed.
B: Piping between refrigerant branch kits
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
1 Outdoor unit
2 Refrigerant branch kits
3-1~3-4 VRVDX indoor units
4 BP units
5 RADX indoor units
A Piping between outdoor unit and (first) refrigerant branch
B-1 B-2 Piping between refrigerant branch kits
C-1~C-4 Piping between refrigerant branch kit and indoor unit
D Piping between refrigerant branch kit and BP unit
E Piping between BP unit and RADX indoor unit
Example: Downstream capacity for B-1 = capacity index of unit 3-1
+ capacity index of unit 3-2
C: Piping between refrigerant branch kit and
indoor unit
Use the same diameters as the connections (liquid, gas) on the
indoor units. The diameters of the indoor units are as follows:
Indoor unit capacity
index
15~5012.76.4
63~14015.99.5
20019.1
25022.2
Piping outer diameter size (mm)
Gas pipeLiquid pipe
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1B – 2015.06
5 Installation
2×3×
8 HP10+12 HP
D: Piping between refrigerant branch kit and BP
unit
Total capacity index
of connected indoor
units
15~6212.76.4
63~14915.99.5
150~20819.1
Piping outer diameter size (mm)
Gas pipeLiquid pipe
E: Piping between BP unit and RA DX indoor unit
Indoor unit capacity
index
15~429.56.4
5012.7
609.5
7115.9
Piping outer diameter size (mm)
Gas pipeLiquid pipe
4.2.4To select refrigerant branch kits
For piping example, refer to "4.2.3 To select the piping size" on
page8.
Refnet joint at first branch (counting from outdoor unit)
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→B‑1.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
ModelMinimum circuit
ampacity
RXYSQ818.5A25A
RXYSQ1022A25A
RXYSQ1224A32A
For all models:
▪ Phase and frequency: 3N~50Hz
▪ Voltage: 380-415V
▪ Transmission line section:
Transmission wiringVinyl cords with 0.75 to
1.25mm² sheath or cables
Maximum wiring length
(= distance between outdoor
and furthest indoor unit)
Total wiring length
(= distance between outdoor
and all indoors)
If the total transmission wiring exceeds these limits, it may
result in communication error.
Recommended
fuses
(2‑core wires)
300m
600m
Outdoor unit capacity type
(HP)
8+10KHRQ22M29T9
12KHRQ22M64T
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch
kit model based on the total capacity index of all indoor units
connected after the refrigerant branch. Example: Refnet joint
B‑1→C‑1.
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 indexRefrigerant branch kit
<200KHRQ22M29H
200≤x<290
290≤x<390KHRQ22M64H
INFORMATION
Maximum 8 branches can be connected to a header.
Refrigerant branch kit
5Installation
5.1Opening the units
5.1.1To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
5.2Mounting the outdoor unit
4.3Preparing electrical wiring
4.3.1Safety 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.
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1B – 2015.06
5.2.1To provide the installation structure
Prepare 4 sets of anchor bolts, nuts and washers (field supply) as
follows:
Installation and operation manual
9
5 Installation
(mm)
>150
620
8 HP: 350 (345~355)
10+12 HP: 490 (485~495)
4× M12
a
20
a
4× M12
≥150 mm
191
6768
395
47
151
aaa
102
118
62
59
216
130
21
20
32
52
98
89
a
4×
a Make sure not to cover the drain holes.
INFORMATION
The recommended height of the upper protruding part of
the bolts is 20mm.
▪ If you install the unit on a frame, install a waterproof plate within
150 mm of the bottom side of the unit in order to prevent the
invasion of water in the unit and to avoid the drain water dripping
(see the following illustration).
NOTICE
If drain holes of the outdoor unit are covered by a mounting
base or by floor surface, raise the unit to provide a free
space of more than 150mm under the outdoor unit.
NOTICE
Fix the outdoor unit to the foundation bolts using nuts with
resin washers (a). If the coating on the fastening area is
stripped off, the nuts rust easily.
5.2.2To install the outdoor unit
Drain holes (dimensions in mm)
ModelBottom view (mm)
RXYSQ8
RXYSQ10+12
a Drain holes
5.2.4To prevent the outdoor unit from falling
over
Connect cables (field supply) as shown.
5.2.3To provide drainage
▪ Make sure that condensation water can be evacuated properly.
▪ Install the unit on a base to make sure that there is a proper
drainage in order to avoid ice accumulation.
▪ Prepare a water drainage channel around the foundation to drain
waste water surrounding the unit.
▪ Avoid drain water flowing over the footpath, so that it does not
become slippery in case of ambient freezing temperatures.
Installation and operation manual
10
5.3Connecting the refrigerant piping
DANGER: RISK OF BURNING
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1B – 2015.06
5 Installation
1
2
3
4
c
d
a
b
p<p
>
R410AN2
bce
a
fg
d
AB
5.3.1Using the stop valve and service port
To handle the stop valve
▪ Make sure to keep both stop valves open during operation.
▪ The stop valve is factory closed.
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~Ø25.4 stop valve, turn the hexagonal
wrench until a torque between 27 and 33N•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 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.
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.
To close the stop valve
1 Remove the stop valve cover.
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. Take
care not to damage it.
▪ After handling the stop valve, make sure to tighten the stop valve
cover securely. For the tightening torque, refer to the table below.
▪ Check for refrigerant leaks after tightening the stop valve cover.
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1B – 2015.06
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
A Valve A
B Valve B
3 Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do not vent gases into the atmosphere.
Installation and operation manual
11
5 Installation
a
b
8 HP
a
b
c
d
10+12 HP
a
b
c
cc
ba
4× Ø6 mm
a
b
a bc
ab fg
cde
A
A
cdd1
dc
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 gas and liquid stop valve pipes
along the black line. Use an appropriate tool (e.g. a pipe cutter,
a pair of nippers).
WARNING
4 Do the following:
▪ Connect the liquid pipe (a) to the liquid stop valve. (brazing)
▪ Connect the gas pipe (b) to the gas stop valve. (brazing)
NOTICE
When brazing: First braze the liquid side piping, then the
gas side piping. Enter the electrode from the front of the
unit and the welding torch from the right side to braze with
the flames facing outside and avoid the compressor sound
insulation and other piping.
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.
5.3.3To connect the refrigerant piping to the
outdoor unit
NOTICE
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.
1 Do the following:
▪ Remove the service cover. See "5.1.1 To open the outdoor
unit"on page9.
▪ Remove the piping intake plate (a) with screw (b).
2 Choose a piping route (a, b, c or d).
a Electrode
b Burning-resistant plate
c Welding torch
d Flames
e Compressor sound insulation
f Liquid side piping
g Gas side piping
▪ Connect the gas piping accessories (c, d), and cut them to
the required length (d1).
Possibility 1: To the front
Possibility 2: To the back
Installation and operation manual
12
3 If you have chosen the downwards piping route:
▪ Drill (a, 4×) and remove the knockout hole (b).
▪ Cut out the slits (c) with a metal saw.
VRV IV-S system air conditioner
RXYSQ8~12TMY1B
4P400263-1B – 2015.06
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