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)
▪ 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.
16 Disposal43
1About the documentation
1.1About this document
Target audience
Authorised installers + end users
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.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
a General safety precautions
b Installation manual and operation manual
c Additional refrigerant charge label
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).
d Installation information sticker
e Fluorinated greenhouse gases label
f Multilingual fluorinated greenhouse gases label
g Piping accessory bag
2.2Accessory pipes: Diameters
Accessory pipes (mm)HPØaØb
Gas pipe
▪ Front connection
819.1
1025.422.2
1225.428.6
14
▪ Bottom connection
16
18
20
Installation and operation manual
5
3 About the units and options
ID Øb
ID Øa
ID Øb
ID Øa
ID Øa
ID Øb
ID Øa
OD Øb
1
3 (12.3 N·m)
2
1
3 (12.3 N·m)
2
a
b
g
c
gg
h
gg
cccd
f
eb
i
a
Accessory pipes (mm)HPØaØb
Liquid pipe
▪ Front connection
▪ Bottom connection
Equaliser pipe
▪ Front connection
▪ Bottom connection
(a)
(a) Only for RYMQ models.
89.5
10
129.512.7
1412.7
16
1812.715.9
20
819.1
10
1219.122.2
14
16
1825.428.6
20
2.3To remove the transportation stay
Only for 14~20 HP
NOTICE
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
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.
ModelDescription
RXYQ8~20Single non-continuous heating model.
RXYQ22~54Multi non-continuous heating model
(consisting of 2 or 3 RXYQ modules).
(a) The RYYQ models provide continuous comfort during
defrost operation.
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 56kW. 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.
3.2System layout
INFORMATION
When using FXTQ indoor units, different requirements
apply. See "4.2.4 Requirements in case of FXTQ indoor
units"on page9.
NOTICE
Design of the system must not be done at temperatures
below –15°C.
3About the units and options
3.1About the outdoor unit
This installation manual concerns the VRV IV, full inverter driven,
heat pump system.
Model line up:
ModelDescription
(a)
(a)
Single continuous heating model.
Multi continuous heating model (consisting
of 2 or 3 RYMQ modules).
RYYQ8~20
RYYQ22~54
Installation and operation manual
6
a VRV IV Heat pump outdoor unit
b Refrigerant piping
c VRV direct expansion (DX) indoor unit
d VRV LT Hydrobox (HXY080/125)
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 (dedicated depending on indoor unit type)
h User interface (wireless, dedicated depending on indoor
unit type)
i Cool/Heat changeover remote control switch
4Preparation
4.1Preparing installation site
4.1.1Installation site requirements of the
outdoor unit
Mind the spacing guidelines. See the "Technical data" chapter.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
4 Preparation
T
AO
(°C WB)
ab
20
15.5
15
10
5
0
–5
–10
–15
–20
10152025
27
30
T
AI
(°C DB)
A
BBB
C
DF
G
E
x
y
b
a
3
1245
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.
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.
4.1.2Additional installation site requirements
of the outdoor unit in cold climates
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:
▪ 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 Ø (mm)Temper grade of piping material
≤15.9O (annealed)
≥19.11/2H (half hard)
▪ All piping lengths and distances have been taken into
consideration (see About the piping length in the installer
reference guide).
4.2.2To select the piping size
INFORMATION
When using FXTQ indoor units, different requirements
apply. See "4.2.4 Requirements in case of FXTQ indoor
units"on page9.
Determine the proper size referring to following tables and reference
figure (only for indication).
4.2Preparing refrigerant piping
4.2.1Refrigerant piping requirements
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
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. If you do so, you also have to
install the heater tape PCB kit (EKBPHPCBT).
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.
1,2 VRVDX indoor unit
3 BP box
4,5 RADX indoor unit
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.
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Gas pipeLiquid pipe
819.19.5
1022.29.5
12~1628.612.7
18~2228.615.9
2434.915.9
26~3434.919.1
36~5441.319.1
D: 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.
▪ Downstream capacity for E=capacity index of unit 1
▪ Downstream capacity for D=capacity index of unit 1+capacity
index of unit 2
E: Piping between refrigerant branch kit 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
15~5012.76.4
63~14015.99.5
20019.1
25022.2
▪ 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.
Piping outer diameter size (mm)
Gas pipeLiquid pipe
▪ 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)
6.4/9.5/12.70.80
15.90.99
19.1/22.20.80
28.60.99
34.91.21
41.31.43
▪ 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 "5.6.3 To determine the additional refrigerant
amount"on page17.
F: Piping between refrigerant branch kit and BP
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
a Outdoor unit
b Main pipes
c Increase if the equivalent piping length is ≥90m
d First refrigerant branch kit
e Indoor unit
Size up
HP classPiping outer diameter size (mm)
Gas pipeLiquid pipe
819.1 → 22.29.5 → 12.7
1022.2 → 25.4
12+1428.6
1628.6 → 31.8
(a)
(b)
(a)
12.7 → 15.9
18~2215.9 → 19.1
2434.9
26~3434.9 → 38.1
36~5441.3
(a) If the size-up size is NOT available, you must use the
standard size. Sizes bigger than the size-up size are NOT
allowed. But even if you use the standard size, the
equivalent piping length is allowed to be more than 90m.
(b) Pipe size-up is NOT allowed.
(b)
(a)
(b)
19.1 → 22.2
G: Piping between BP unit and RA DX indoor unit
Only in case RADX indoor units are connected.
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipeLiquid pipe
20, 25, 309.56.4
5012.7
609.5
7115.9
4.2.3To select refrigerant branch kits
INFORMATION
When using FXTQ indoor units, different requirements
apply. See "4.2.4 Requirements in case of FXTQ indoor
units"on page9.
Refrigerant refnets
For piping example, refer to "4.2.2 To select the piping size" on
page7.
▪ 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).
Installation and operation manual
8
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
4 Preparation
Ø22.2 mm
Ø28.6 mm
Ø19.1 mm
4
23
4
1
1234
3
2
1
1.2.
C
C
A
A
B
b
a1
a2
a2
12 HP FXTQ80 FXTQ80 FXTQ80 FXTQ80
14 HP FXTQ100 FXTQ80 FXTQ100 FXTQ80
16 HP FXTQ100 FXTQ100 FXTQ100 FXTQ100
10 HP FXTQ63 FXTQ63 FXTQ63 FXTQ63
8 HP FXTQ50 FXTQ50 FXTQ50 FXTQ50
Outdoor unit capacity type
(HP)
8~10KHRQ22M29T9
12~22KHRQ22M64T
24~54KHRQ22M75T
▪ 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 index2 pipes
<200KHRQ22M20T
200≤x<290KHRQ22M29T9
290≤x<640KHRQ22M64T
≥640KHRQ22M75T
▪ 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 index2 pipes
<200KHRQ22M29H
200≤x<290
290≤x<640KHRQ22M64H
≥640KHRQ22M75H
(a) If the pipe size above the refnet header is Ø34.9 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.
2 pipes
(a)
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
4.2.4Requirements in case of FXTQ indoor
units
When using FXTQ indoor units, the following requirements apply.
Possible combinations
FXTQ indoor units cannot be combined with any other indoor type
compatible with the outdoor unit. Only the following outdoor-indoor
unit combinations are allowed:
Outdoor unitFXTQ50FXTQ63FXTQ80 FXTQ100
RYYQ8/RXYQ84× O———
RYYQ10/RXYQ10—4× O——
RYYQ12/RXYQ12——4× O—
RYYQ14/RXYQ14——2× O2× O
RYYQ16/RXYQ16———4× O
System layout (2 possibilities)
Number of outdoor unitsBranch kit name
2BHFQ22P1007
3BHFQ22P1517
The RYYQ22~54 models, consisting of two or three RYMQ modules,
require a 3-pipe system. There is an additional equalising pipe for
such modules (in addition to the conventional gas and liquid piping).
This equalising pipe does not exist for RYYQ8~20 or RXYQ8~54
units.
The equalising pipe connections for the different RYMQ modules are
mentioned in below table.
RYMQEqualising pipe Ø (mm)
819.1
10~1622.2
18~2028.6
Deciding the equalising pipe diameter:
▪ In case of 3 multi units: the connection diameter of outdoor to T-
joint has to be kept.
▪ In case of 2 multi units: the connection pipe has to have the
largest diameter.
There is never a connection of the equalising pipe with the indoor
units.
Example: (free multi combination)
RYMQ8+RYMQ12+RYMQ18. Largest connection is Ø28.6
(RYMQ18); Ø22.2 (RYMQ12) and Ø19.1 (RYMQ8). In figure below
only equalising pipe is shown.
A Piping between outdoor unit and first refrigerant branch kit
B Piping between refrigerant branch kits
C Piping between refrigerant branch kit and indoor units
a1, a2 Refnet joints
b Refnet header
Refrigerant piping length and height difference
The piping lengths and height differences must comply with the
following requirements.
Maximum piping lengths
1 Longest pipe (actual)≤120m
2 After first branch≤40m
3 Total piping length≤300m
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
Installation and operation manual
9
4 Preparation
a
b
b
a
b
a
a
b
a
b
b
a
a
bbb
a
bbb
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: Piping between outdoor unit and first refrigerant branch kit
Use the following diameters:
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Gas pipeLiquid pipe
819.19.5
1022.29.5
12~1628.612.7
B: Piping between refrigerant branch kits
Use the following diameters:
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Gas pipeLiquid pipe
8+1022.29.5
1228.612.7
14+1628.615.9
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 unitPiping outer diameter size (mm)
Gas pipeLiquid pipe
FXTQ5015.99.5
FXTQ6315.99.5
FXTQ8019.19.5
FXTQ10022.29.5
Pattern 1Pattern 2
a To indoor unit
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.
a1, a2: Refnet joints
Outdoor unit capacity type
Refnet joint
(HP)
8+10KHRQ22M29T9
12~16KHRQ22M64T
b: Refnet header
Outdoor unit capacity type
Refnet header
(HP)
8+10KHRQ22M64H
12~16KHRQ22M75H
Additional refrigerant charge
When using FXTQ indoor units, additional refrigerant needs to be
charged to the system.
Total system refrigerant charge = Z = O+R+P
O Standard factory charge of outdoor unit
R Additional refrigerant charge according to liquid piping
diameter/length and outdoor unit specific amount. See
"5.6.3To determine the additional refrigerant amount"on
page17.
P Additional refrigerant charge due to use of FXTQ indoor
units. P=ΣT
T Additional charge for each indoor unit used (depending on
type)
1..4
Indoor unitT (kg)
FXTQ500.6
FXTQ630.5
FXTQ800.9
FXTQ1001.1
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 200mm or more in the gas line within a length of 2m
from the kit.
IfThen
≤2m
>2m
4.2.5Multiple 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.
Installation and operation manual
10
a To indoor unit
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
5 Installation
ABC
a bc
14×14×
8~12 HP14~20 HP
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 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.
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.
ExampleCombining the RXYQ30 by using the RXYQ8,
RXYQ10, and RXYQ12.
▪ Minimum circuit ampacity of the RXYQ8=16.1A
▪ Minimum circuit ampacity of the RXYQ10=22.0A
▪ Minimum circuit ampacity of the RXYQ12=24.0A
Accordingly, the minimum circuit ampacity of the
RXYQ30=16.1+22.0+24.0=62.1A
Multiplying the above result by 1.1 (62.1×1.1)=68.31A,
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.
5Installation
5.1Opening the units
5.1.1To 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:
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
FormulaCalculate, 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.
circuit
ampacity
Recommended
fuses
Once the front plates open, the electrical component box can be
accessed. See "5.1.2 To open the electrical component box of the
outdoor unit"on page11.
For service purposes, the push buttons on the main PCB need to be
accessed. To access these push buttons, the electrical component
box cover does not need to be opened. See "6.1.3To access the
field setting components"on page27.
5.1.2To 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.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
Installation and operation manual
11
5 Installation
2×
8~12 HP
SW8
14~20 HP
6×
SW8
a
b
c
d
e
≥100 mm
≥100 mm
*
729
≤613
≥929
≥AB
AA
a
(mm)
20 mm
a
ab
c
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
Minimum foundation
a Anchor point (4×)
HPAAAB
8~12766992
14~2010761302
▪ 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.
5.2Mounting the outdoor unit
5.2.1To provide the installation structure
Make sure the unit is installed level on a sufficiently strong base to
prevent vibration and noise.
▪ The height of the foundation must at least be 150 mm from the
▪ The preferred installation is on a solid longitudinal foundation
Installation and operation manual
12
NOTICE
When the installation height of the unit needs to be
increased, do not use stands to only support the corners.
X Not allowed
O Allowed (* = preferred installation)
floor. In heavy snowfall areas, this height should be increased,
depending on the installation place and condition.
(steel beam frame or concrete). The foundation must be larger
than the grey marked area.
5.3Connecting the refrigerant piping
5.3.1To 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:
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
c
b
a
a Large knockout hole
a
a
AB
7.5°
7.5°
>120 mm
>500 mm
b Drill
c Points for drilling
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.
5.3.2To connect the refrigerant piping to the
outdoor unit
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.
Connection from the stop valves to the field piping can be done by
using accessory pipes supplied as accessory.
The connections to the branch kits are the responsibility of the
installer (field piping).
5 Installation
5.3.4Multiple outdoor units: Knockout holes
ConnectionDescription
Front connectionRemove the front plate knockout holes to
connect.
Bottom connectionRemove the knockout holes on the bottom
frame and route the piping under the bottom.
5.3.5To protect against contamination
Block all gaps in the holes for passing out piping and wiring using
sealing material (field supply) (otherwise the capacity of the unit will
drop and small animals may enter the machine).
5.3.6Using the stop valve and service port
5.3.3To 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
▪ 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.
To handle the stop valve
▪ Make sure to keep all 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 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.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
Installation and operation manual
13
5 Installation
1
2
3
4
c
d
a
b
p<p
>
R410AN2
bce
a
fg
d
AB
Tightening torques
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.
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.
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 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.
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
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.
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, liquid and equalising stop
valve pipes along the black line. Use an appropriate tool (e.g. a
pipe cutter, a pair of nippers).
Installation and operation manual
14
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1D – 2016.11
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