Daikin VRV 5 User manual

Installation and operation manual
VRV 5 safety valve unit English
Installation and operation manual
VRV 5 safety valve unit
SV1A25AJV1B
SV4A14AJV1B
SV6A14AJV1B
SV8A14AJV1B

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5 25 30 35 40 45 50 55 60 65201510 70 75 80
No safety measure (c)
Ventilated enclosure (e)
m[kg]
Amin [m2]
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5 25 30 35 40 45 50 55 60 65201510 70 75 80
No safety measure
(c)
m[kg]
Lowest underground floor (a) All other floors (b)
Amin [m2]
External alarm OR
Natural ventilation
(d)
Ventilated enclosure
OR
External alarm + natural ventilation (f)
m[kg]
Amin [m²]
Lowest underground floor (a)
No safety measure (c) No safety measure (c) External alarm OR
Natural Ventilation (d)
m[kg]
Amin [m²]
All other floors (b) Lowest underground floor (a) All other floors (b)
No safety measure (c) No safety measure (c) External alarm OR
Natural Ventilation (d)
5 15 10 10 43 128 85 85
6 18 12 12 131 87 87
7 21 14 14
44
134 89 89
8 24 16 16
45
137 91 91
9 27 18 18
46
140 93 93
10 30 20 20
47
143 95 95
11 33 22 22
48
146 97 97
12 36 24 24
49
149 99 99
13 39 26 26
50
152 101 101
14 42 28 28
51
154 103 103
15 45 30 30
52
157 105 105
16 48 32 32
53
160 107 107
17 51 34 34
54
163 109 109
18 54 36 36
55
166 111 111
19 57 38 38
56
169 113 113
20 60 40 40
57
172 115 115
21 63 42 42
58
175 117 117
22 66 44 44
59
178 119 119
23 69 46 46
60
181 121 121
24 72 48 48
61
184 123 123
25 75 50 50
62
187 125 125
26 77 52 52
63
190 127 127
27 80 54 54
64
193 129 129
28 83 56 56
65
196 131 131
29 86 58 58
66
199 133 133
30 89 60 60
67
202 135 135
31 92 62 62
68
205 137 137
32 95 64 64
69
208 139 139
33 98 66 66
70
211 141 141
34 101 68 68
71
143214 143
35 104 70 70
72
217 145 145
36 107 72 72
73
220 147 147
37 110 74 74
74
223 149 149
38 113 76 76
75
226 151 151
39 116 77 77
76
229 153 153
40 119 79 79
77
231 154 154
41 122 81 81
78
234 156 156
42 125 83 83
79
80 237 158 158
1

Table of contents
Installation and operation manual
3
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Table of contents
1 About this document 4
2 Specific installer safety instructions 4
2.1 Instructions for equipment using R32 refrigerant ...................... 6
For the user 7
3 User safety instructions 7
3.1 General...................................................................................... 7
3.2 Instructions for safe operation ................................................... 7
4 About the system 9
4.1 System layout............................................................................ 10
5 Before operation 10
6 Maintenance and service 10
6.1 Precautions for maintenance and service ................................. 10
6.2 About the refrigerant.................................................................. 10
6.2.1 About the refrigerant leakage sensor.......................... 10
7 Troubleshooting 11
7.1 Symptoms that are NOT system malfunctions .......................... 11
7.1.1 Symptom: noise .......................................................... 11
8 Relocation 11
9 Disposal 11
For the installer 12
10 About the box 12
10.1 To remove the accessories ....................................................... 12
11 About the unit and options 12
11.1 Identification .............................................................................. 12
11.1.1 Identification label: SV unit.......................................... 12
11.2 About the operation range......................................................... 12
11.3 System layout............................................................................ 12
11.4 Combining units and options ..................................................... 13
11.4.1 Possible options for the SV unit.................................. 13
12 Special requirements for R32 units 13
12.1 Installation space requirements................................................. 13
12.2 System layout requirements...................................................... 13
12.3 To determine the required safety measures.............................. 14
12.3.1 Overview: flowchart..................................................... 15
12.4 Safety measures ....................................................................... 16
12.4.1 No safety measure...................................................... 16
12.4.2 External alarm............................................................. 16
12.4.3 Natural ventilation ....................................................... 16
12.4.4 Ventilated enclosure ................................................... 17
12.4.5 Overview: flowchart..................................................... 21
12.5 Combinations of ventilated enclosure configurations ................ 22
12.6 Combinations of safety measures ............................................. 22
13 Unit installation 23
13.1 Preparing the installation site .................................................... 23
13.1.1 Installation site requirements of the unit ..................... 23
13.2 Possible configurations ............................................................. 24
13.3 Opening and closing the unit..................................................... 25
13.3.1 About opening the unit................................................ 25
13.3.2 To open the unit.......................................................... 25
13.3.3 To close the unit.......................................................... 25
13.4 Mounting the unit....................................................................... 25
13.4.1 To mount the unit........................................................ 25
13.4.2 To connect the drain piping.......................................... 26
13.4.3 To install the drain piping ............................................. 27
13.5 Installing the ventilation ducting ................................................. 27
13.5.1 To install the ducting .................................................... 27
13.5.2 To install the duct closing plate.................................... 27
13.5.3 To switch the air in- and outlet side ............................. 28
14 Piping installation 30
14.1 Installation limitations ................................................................. 31
14.1.1 Piping installation limitation.......................................... 31
14.2 Preparing refrigerant piping........................................................ 31
14.2.1 Refrigerant piping requirements................................... 31
14.2.2 Refrigerant piping material........................................... 31
14.2.3 Refrigerant piping insulation ........................................ 31
14.3 Connecting the refrigerant piping ............................................... 32
14.3.1 To connect the refrigerant piping ................................. 32
14.3.2 Joining branch pipe ports............................................. 32
14.4 To insulate the refrigerant piping................................................ 32
15 Electrical installation 33
15.1 Specifications of standard wiring components ........................... 33
15.2 Connecting the electrical wiring.................................................. 34
15.3 To connect the electrical wiring .................................................. 34
15.4 To finish the electrical wiring ...................................................... 36
15.5 To set the DIP switches.............................................................. 36
15.6 To connect the external outputs ................................................. 36
16 Configuration 37
16.1 Making field settings................................................................... 37
16.1.1 About making field settings .......................................... 37
16.1.2 To access the field setting components....................... 38
16.1.3 Field setting components ............................................. 38
16.1.4 To access mode 1 or 2 ................................................ 38
16.1.5 To use mode 1 ............................................................. 38
16.1.6 To use mode 2 ............................................................. 39
16.1.7 Mode 1: monitoring settings......................................... 39
16.1.8 Mode 2: field settings ................................................... 39
16.1.9 Mode 2: default field settings ....................................... 41
17 Commissioning 41
17.1 Checklist before commissioning................................................. 41
17.2 SV unit test run........................................................................... 41
17.2.1 About the SV unit test run............................................ 41
17.2.2 About airflow requirements .......................................... 42
17.2.3 About measuring the airflow rate ................................. 42
17.2.4 To perform a SV unit test run....................................... 43
17.2.5 Troubleshooting during a SV unit test run.................... 43
17.3 System test run .......................................................................... 43
17.3.1 Checklist before commissioning .................................. 43
17.3.2 System test run ............................................................ 43
18 Hand-over to the user 44
19 Maintenance and service 44
19.1 Before the maintenance and service of the SV unit ................... 44
19.2 SV unit maintenance and service label ...................................... 44
20 Troubleshooting 44
20.1 Overview: Troubleshooting......................................................... 44
20.2 Precautions when troubleshooting ............................................. 44
20.3 Solving problems based on error codes..................................... 44
20.3.1 Error codes: Overview ................................................. 44
21 Disposal 45
22 Technical data 45
22.1 Wiring diagram ........................................................................... 45
23 Glossary 46

1 About this document
Installation and operation manual
4
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
1 About this document
WARNING
Make sure installation, servicing, maintenance, repair and
applied materials follow the instructions from Daikin
(including all documents listed in “Documentation set”)
and, in addition, comply with applicable legislation and are
performed by qualified persons only. In Europe and areas
where IEC standards apply, EN/IEC 60335-2-40 is the
applicable standard.
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 and household 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 SV unit)
▪SV unit installation and operation manual:
▪ Installation and operation instructions
▪ Format: Paper (in the box of the SV 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 https://www.daikin.eu. Use the search
function to find your model.
The latest revision of the supplied documentation is published on the
regional Daikin website and is available via your dealer.
The original instructions are written in English. All other languages
are translations of the original instructions.
Technical engineering data
▪ A subset of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The full set of the latest technical data is available on the Daikin
Business Portal (authentication required).
2 Specific installer safety
instructions
Always observe the following safety instructions and regulations.
Unit installation (see "13Unit installation"[423])
WARNING
The fixing method of the unit MUST be in accordance with
the instructions from this manual. See "13.4 Mounting the
unit"[425].
WARNING
Follow the service space dimensions in this manual to
install the unit correctly. See "13.1.1 Installation site
requirements of the unit"[423].
WARNING
In case the safety measures require a ventilated enclosure,
respect the following:
▪ Auxiliary devices which may be a potential ignition
source shall not be installed in the ductwork (example:
hot surfaces with a temperature exceeding 700°C and
electric switching devices).
▪ Only auxiliary devices (example: extraction fan)
approved by the manufacturer are used in the
ductwork.
WARNING
If the ventilated enclosure safety measure is applied, the
SV unit must have its own ductwork and extraction fan. Do
NOT combine this ductwork with ducting for other
purposes.
WARNING
Do NOT install operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater) in the ductwork.
WARNING
The appliance shall be stored as follows:
▪ in such a way as to prevent mechanical damage.
▪ in a well-ventilated room without continuously operating
ignition sources (example: open flames, an operating
gas appliance or an operating electric heater).
▪ in a room with dimensions as specified in "12 Special
requirements for R32 units"[413].
WARNING
Safety shut-off valves shall only be replaced with valves
specified by the appliance manufacturer.
CAUTION
Appliance NOT accessible to the general public. Install it in
a secured area, protected from easy access.
This unit is suitable for installation in a commercial, light
industrial, household and residential environment.
CAUTION
If the metal duct passes through a metal lath, wire lath or
metal plate of the wooden structure, separate the duct and
wall electrically.
Refrigerant piping installation (see "14Piping
installation"[430])
DANGER: RISK OF BURNING/SCALDING
WARNING
Field piping MUST be in accordance with the instructions
from this manual. See "14Piping installation"[430].
CAUTION
Piping MUST be installed according to instructions given in
"14 Piping installation" [4 30]. Only mechanical joints (e.g.
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
Low temperature solder alloys shall not be used for pipe
connections.

2 Specific installer safety instructions
Installation and operation manual
5
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
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 might be produced if refrigerant gas comes
into contact with fire.
WARNING
During tests, NEVER pressurise the product with a
pressure higher than the maximum allowable pressure (as
indicated on the nameplate of the unit).
WARNING
Bent header or branch pipes can lead to refrigerant
leakage. Possible consequence: asphyxiation,
suffocation and fire.
▪ NEVER bend the branch and header pipes sticking out
of the unit. They have to remain straight.
▪ ALWAYS support the branch and header pipes at a
distance of 1m from the unit.
WARNING
Overheated insulation can start to burn. Possible
consequence: fire.
▪ When performing brazing work header or branch pipes,
cool all other header and branch pipes by wrapping
them in wet cloths.
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
CAUTION
▪ Do NOT use mineral oil on flared part.
▪ Do NOT reuse piping from previous installations.
▪ NEVER install a drier to this unit to guarantee its
lifetime. The drying material may dissolve and damage
the system.
Electrical installation (see "15Electrical installation"[433])
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF ELECTROCUTION
Before performing work on the unit, disconnect any power
source connected to the unit.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
WARNING
Electrical wiring MUST be in accordance with the
instructions from this manual. See "15 Electrical
installation"[433].
WARNING
▪ All wiring MUST be performed by an authorised
electrician and MUST comply with the national wiring
regulation.
▪ Make electrical connections to the fixed wiring.
▪ All components procured on-site and all electrical
construction MUST comply with the applicable
legislation.
WARNING
The electrical components shall only be replaced with parts
specified by the appliance manufacturer. Replacement with
other parts may result in the ignition of refrigerant in the
event of a leak.
WARNING
The appliance MUST be installed in accordance with
national wiring regulations.
WARNING
▪ If the power supply has a missing or wrong N-phase,
equipment might break down.
▪ Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shocks.
▪ Install the required fuses or circuit breakers.
▪ Secure the electrical wiring with cable ties so that the
cables do NOT come into contact with sharp edges or
piping, particularly on the high-pressure side.
▪ Do NOT use taped wires, extension cords, or
connections from a star system. They can cause
overheating, electrical shocks or fire.
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least
3 mm between the contact point gaps that provides full
disconnection under overvoltage category III.
WARNING
The appliance MUST be installed in accordance with
national wiring regulations.
CAUTION
Do NOT push or place redundant cable length into the unit.
CAUTION
Be careful NOT to pinch cables between the service cover
and the switchbox.
Commissioning (see "17Commissioning"[441])
WARNING
Commissioning MUST be in accordance with the
instructions from this manual. See
"17Commissioning"[441].
CAUTION
Do NOT perform the test operation while working on
the indoor units.
When performing the test operation, NOT ONLY the
outdoor unit, but the connected indoor unit will operate as
well. Working on an indoor unit while performing a test
operation is dangerous.

2 Specific installer safety instructions
Installation and operation manual
6
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet (damper).
WARNING
Safety shut-off valves shall only be replaced with valves
specified by the appliance manufacturer.
Troubleshooting (see "20Troubleshooting"[444])
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover
is removed.
DANGER: RISK OF BURNING/SCALDING
WARNING
Prevent hazards due to inadvertent resetting of the thermal
cut-out: power to this appliance MUST NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
WARNING
▪ When carrying out an inspection on the switch box of
the unit, ALWAYS make sure that the unit is
disconnected from the mains. Turn off the respective
circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
2.1 Instructions for equipment using
R32 refrigerant
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate
the defrosting process other than those recommended
by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The appliance shall be stored as follows:
▪ in such a way as to prevent mechanical damage.
▪ in a well-ventilated room without continuously operating
ignition sources (example: open flames, an operating
gas appliance or an operating electric heater).
▪ in a room with dimensions as specified in "12 Special
requirements for R32 units"[413].
WARNING
Make sure installation, servicing, maintenance and repair
comply with instructions from Daikin and with applicable
legislation (for example national gas regulation) and are
executed ONLY by authorised persons.
WARNING
Refrigerant sensors of the refrigerant detection system
shall only be replaced with refrigerant sensors specified by
the appliance manufacturer.
WARNING
Safety shut-off valves shall not be reset until the room has
been ventilated. Resetting may result in additional
flammable refrigerant to be released into the room.
WARNING
▪ Take precautions to avoid excessive vibration or
pulsation to refrigeration piping.
▪ Protect the protection devices, piping and fittings as
much as possible against adverse environmental
effects.
▪ Provide space for expansion and contraction of long
runs of piping.
▪ Design and install piping in refrigerating systems such
as to minimise the likelihood of hydraulic shock
damaging the system.
▪ Mount the indoor equipment and pipes securely and
protect them to avoid accidental rupture of equipment
or pipes in case of events such as moving furniture or
reconstruction activities.
CAUTION
Do NOT use potential sources of ignition in searching for
or detection of refrigerant leaks.
NOTICE
▪ Do NOT re-use joints and copper gaskets which have
been used already.
▪ Joints made in the installation between parts of the
refrigerant system shall be accessible for maintenance
purposes.
See "12.3 To determine the required safety measures" [4 14] to
check if your system meets the R32 safety requirements.

3 User safety instructions
Installation and operation manual
7
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
For the user
3 User safety instructions
Always observe the following safety instructions and regulations.
3.1 General
WARNING
If you are NOT sure how to operate the
unit, contact your installer.
WARNING
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 electrical 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.
CAUTION
▪ 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: dismantling the system, treatment of the
refrigerant, of oil and of other parts MUST be done by an
authorised installer and MUST comply with applicable legislation.
Units MUST be treated at a specialised 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 specialised 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.
3.2 Instructions for safe operation
WARNING
Do NOT install operating ignition
sources (example: open flames, an
operating gas appliance or an
operating electric heater) in the
ductwork.
WARNING
▪ Do NOT modify, disassemble,
remove, reinstall or repair the unit
yourself as incorrect dismantling or
installation may cause an electrical
shock or fire. Contact your dealer.

3 User safety instructions
Installation and operation manual
8
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
▪ In case of accidental refrigerant
leaks, make sure there are no naked
flames. The refrigerant itself is
entirely safe, non-toxic and mildly
flammable, but it will generate toxic
gas when it accidentally leaks into a
room where combustible air from fan
heaters, gas cookers, etc. is present.
Always have qualified service
personnel confirm that the point of
leakage has been repaired or
corrected before resuming operation.
WARNING
This unit contains electrical and hot
parts.
WARNING
Before operating the unit, be sure the
installation has been carried out
correctly by an installer.
WARNING
Do NOT obstruct the opening of the air
inlet (damper).
WARNING
The unit is equipped with a refrigerant
leak detection system for safety.
To be effective, the unit MUST be
electrically powered at all times after
installation, except for short service
periods.
Maintenance and service (see "6Maintenance and
service"[410])
WARNING
The unit is equipped with a refrigerant
leak detection system for safety.
To be effective, the unit MUST be
electrically powered at all times after
installation, except for maintenance.
WARNING
NEVER replace a fuse with a fuse of a
wrong ampere ratings or other wires
when a fuse blows out. Use of wire or
copper wire may cause the unit to
break down or cause a fire.
WARNING
If the supply cord is damaged, it MUST
be replaced by the manufacturer, its
service agent or similarly qualified
persons in order to avoid a hazard.
WARNING
Be careful with ladders when working
in high places.
CAUTION
After a long use, check the unit stand
and fitting for damage. If damaged, the
unit may fall and result in injury.
CAUTION
Do NOT insert fingers, rods or other
objects into the air inlet (damper).
CAUTION
Before accessing terminal devices,
make sure to interrupt all power supply.
About the refrigerant (see "6.2About the refrigerant"[410])
WARNING
▪ Do NOT pierce or burn refrigerant
cycle parts.
▪ Do NOT use cleaning materials or
means to accelerate the defrosting
process other than those
recommended by the manufacturer.
▪ Be aware that the refrigerant inside
the system is odourless.
WARNING
▪ The refrigerant inside the unit is
mildly flammable, but normally does
NOT leak. If the refrigerant leaks in
the room and comes in contact with
fire from a burner, a heater, or a
cooker, this may result in fire, or the
formation of a harmful gas.
▪ Turn OFF any combustible heating
devices, ventilate the room, and
contact the dealer where you
purchased the unit.
▪ Do NOT use the unit until a service
person confirms that the part from
which the refrigerant leaked has been
repaired.

4 About the system
Installation and operation manual
9
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
WARNING
The appliance shall be stored in a
room without continuously operating
ignition sources (example: open
flames, an operating gas appliance or
an operating electric heater).
WARNING
The R32 refrigerant leakage sensor
must be replaced after every detection
or at the end of its lifetime. ONLY
authorised persons may replace the
sensor.
WARNING
Refrigerant sensors of the refrigerant
detection system shall only be replaced
with refrigerant sensors specified by
the appliance manufacturer.
Troubleshooting (see "7Troubleshooting"[411])
WARNING
In case of a refrigerant leak, the
system needs power to contain the
problem.
1. Do NOT turn OFF the power supply.
2. Contact your dealer.
Possible consequence: Leaking
refrigerant can lead to suffocation,
asphyxiation and fire.
In case anything else unusual occurs
(burning smells etc.):
1. Stop operation.
2. Shut OFF the power
3. Contact your dealer.
Possible consequence: Leaving the
unit running under such circumstances
may cause breakage, electrical shock
or fire.
WARNING
Make sure installation, servicing,
maintenance, repair and applied
materials follow the instructions from
Daikin (including all documents listed in
“Documentation set”) and, in addition,
comply with applicable legislation and
are performed by qualified persons
only. In Europe and areas where IEC
standards apply, EN/IEC 60335-2-40 is
the applicable standard.
4 About the system
WARNING
▪ Do NOT modify, disassemble, remove, reinstall or
repair the unit yourself as incorrect dismantling or
installation may cause an electrical shock or fire.
Contact your dealer.
▪ In case of accidental refrigerant leaks, make sure there
are no naked flames. The refrigerant itself is entirely
safe, non-toxic and mildly flammable, but it will
generate toxic gas when it accidentally leaks into a
room where combustible air from fan heaters, gas
cookers, etc. is present. Always have qualified service
personnel confirm that the point of leakage has been
repaired or corrected before resuming operation.
WARNING
The unit is equipped with a refrigerant leak detection
system for safety.
To be effective, the unit MUST be electrically powered at
all times after installation, except for short service periods.
NOTICE
Do NOT use the system for other purposes. In order to
avoid any quality deterioration, do NOT use the unit for
cooling precision instruments, food, plants, animals, or
works of art.
NOTICE
For future modifications or expansions of your system:
A full overview of allowable combinations (for future
system extensions) is available in technical engineering
data and should be consulted. Contact your installer to
receive more information and professional advice.

5 Before operation
Installation and operation manual
10
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VRV 5 safety valve unit
4P709466-1 – 2023.09
4.1 System layout
INFORMATION
The following figure is an example and may NOT
completely match your system layout
a
c
de
g
i
f
e
cc
e
h
ii i
b
e
j
aHeat pump outdoor unit
bSafety valve unit (SV)
cVRV direct expansion (DX) indoor unit
dVRV direct expansion (DX) indoor unit (direct connection
from outdoor to indoor)
eRemote controller in normal mode
fRemote controller in alarm only mode
gRemote controller in supervisor mode (mandatory in
some situations)
hCentralised controller (optional)
iOption PCB (optional)
jCool/heat changeover remote control switch (optional)
Refrigerant piping
Interconnection and user interface wiring
Direct connection of indoor units to the outdoor unit
5 Before operation
CAUTION
See "3 User safety instructions" [4 7] to acknowledge all
related safety instructions.
NOTICE
NEVER inspect or service the unit by yourself. Ask a
qualified service person to perform this work.
NOTICE
Turn ON the power 6 hours before operation in order to
have power running to the crankcase heater and to protect
the compressor.
This operation manual is for the following systems with standard
control. Before initiating operation, contact your dealer for the
operation that corresponds to your system type and mark. If your
installation has a customised control system, ask your dealer for the
operation that corresponds to your system.
6 Maintenance and service
6.1 Precautions for maintenance and
service
CAUTION
See "3 User safety instructions" [4 7] to acknowledge all
related safety instructions.
NOTICE
NEVER inspect or service the unit by yourself. Ask a
qualified service person to perform this work.
NOTICE
Maintenance MUST be done by an authorised installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
Following symbols may occur on the indoor unit:
Symbol Explanation
Measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing.
6.2 About the refrigerant
CAUTION
See "3 User safety instructions" [4 7] to acknowledge all
related safety instructions.
This product contains fluorinated greenhouse gases. Do NOT vent
gases into the atmosphere.
Refrigerant type: R32
Global warming potential (GWP) value: 675
Periodical inspections for refrigerant leaks may be required
depending on the applicable legislation. Contact your installer for
more information.
NOTICE
Applicable legislation on fluorinated greenhouse gases
requires that the refrigerant charge of the unit is indicated
both in weight and CO2 equivalent.
Formula to calculate the quantity in CO2 equivalent
tonnes: GWP value of the refrigerant × total refrigerant
charge [in kg]/1000
Contact your installer for more information.
6.2.1 About the refrigerant leakage sensor
WARNING
The R32 refrigerant leakage sensor must be replaced after
every detection or at the end of its lifetime. ONLY
authorised persons may replace the sensor.
NOTICE
The R32 refrigerant leakage sensor is a semiconductor
detector which may incorrectly detect substances other
than R32 refrigerant. Avoid using chemical substances
(e.g. organic solvents, hair spray, paint) in high
concentrations, in the close proximity of the SV unit
because this may cause misdetection by the R32
refrigerant leakage sensor.
NOTICE
Functionality of the safety measures are periodically
automatically checked. In case of malfunction, an error
code will be displayed on the user interface.
INFORMATION
The sensor has a lifetime of 10 years. The user interface
displays error "CH-22" 6 months before the end of the
sensor lifetime and error "CH-23" after the end of the
sensor lifetime. For more information, see the reference
guide of the user interface and contact your dealer.

7 Troubleshooting
Installation and operation manual
11
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VRV 5 safety valve unit
4P709466-1 – 2023.09
In case of detection
1The user interface of the indoor units connected to the SV unit
displays error "A0-20".
2If applicable, the safety measures of the SV unit are activated.
These can be the following:
▪ the external alarm emits a signal, or
▪ the extraction fan and damper of the SV unit start operating in
case of a ventilated enclosure.
3Contact your dealer immediately. For more information, see the
installation manual of the outdoor unit.
INFORMATION
To stop the alarm of the user interface, see the reference
guide of the user interface.
7 Troubleshooting
If one of the following malfunctions occurs, take the measures
shown below and contact your dealer.
WARNING
In case of a refrigerant leak, the system needs power to
contain the problem.
1. Do NOT turn OFF the power supply.
2. Contact your dealer.
Possible consequence: Leaking refrigerant can lead to
suffocation, asphyxiation and fire.
In case anything else unusual occurs (burning smells etc.):
1. Stop operation.
2. Shut OFF the power
3. Contact your dealer.
Possible consequence: Leaving the unit running under
such circumstances may cause breakage, electrical shock
or fire.
The system MUST be repaired by a qualified service person.
Malfunction Measure
If the system does not
operate at all.
Check if there is no power failure. Wait until
power is restored. If power failure occurs
during operation, the system automatically
restarts immediately after power is restored.
Check if no fuse has blown or breaker is
activated. If necessary, change the fuse or
reset the breaker.
If the problem persists, contact your installer
If a refrigerant leak
occurs (error code
/ )
Actions will be taken by the system. Do NOT
turn OFF the power supply.
Contact your installer and report the error
code.
If a safety device such
as a fuse, a breaker
or an earth leakage
breaker frequently
actuates.
Turn off the main power switch.
Contact your installer
If water leaks from the
unit.
Stop the operation.
Contact your installer.
Other issues Contact your installer. State the symptoms,
the complete model name of the unit (with
manufacturing number if possible) and the
installation date (possibly listed on the
warranty card).
7.1 Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
7.1.1 Symptom: noise
▪ A "zeen" sound is heard immediately after the power supply is
turned on. The electronic expansion valve inside the SV unit starts
working and makes the noise. Its volume will reduce in about a
minute.
▪ A continuous low hissing sound is heard when the system is in
cooling or defrost operation. This is the sound of refrigerant gas
flowing through the SV unit.
▪ A hissing sound originating from the 4-way valve in the outdoor
unit which is heard at the start or immediately after stopping
operation or defrost operation, or when switching from cooling to
heating operation and vice versa.
8 Relocation
Contact your dealer to remove and reinstall the entire unit. Moving
units requires technical expertise.
9 Disposal
This unit uses hydrofluorocarbon. Contact your dealer when
discarding this unit. It is required by law to collect, transport and
discard the refrigerant in accordance with the "hydrofluorocarbon
collection and destruction" regulations.
NOTICE
Do NOT try to dismantle the system yourself: dismantling
of the system, treatment of the refrigerant, oil and other
parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for
reuse, recycling and recovery.

10 About the box
Installation and operation manual
12
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
For the installer
10 About the box
NOTICE
Before installation, check the packaging and parts for
damage. Make sure that the shipment is complete.
NOTICE
When you carry or manipulate the unit, never tilt it more
than 70 degrees in any direction.
70°max.
Keep the following in mind:
▪ At delivery, the unit MUST be checked for damage and
completeness. Any damage or missing parts MUST be reported
immediately to the claims agent of the carrier.
▪ Bring the packed unit as close as possible to its final installation
position to prevent damage during transport.
▪ Prepare in advance the path along which you want to bring the
unit to its final installation position.
10.1 To remove the accessories
n
2/1x o 1/3/2x p 1x q 2x r
2x
s
1x t 2x u 2x v
2x
fg h
b c d
1x
1x 1x 1x
1x 1x e
1x
i
3/1x j
4/2x
k
2x l 8/11x m
1x
a
aDeclaration of conformity
bInstallation and operation manual
cGeneral safety precautions
dDrain hose
eMetal clamp
fSealing material (large)
gSealing material (small)
hSealing material (thin sheet)
iInsulation tube for stopper pipe Ø9.5mm (3× for SV4A,
1× for SV1A and SV6~8A)
jInsulation tube for stopper pipe Ø15.9mm (4× for SV4A,
2× for SV1A and SV6~8A)
kInsulation tube for stopper pipe Ø22.2mm
lCable ties (8× for SV4A, 11× for SV1A and SV6~8A)
mDuct closing plate
nStopper pipe Ø9.5mm (2× for SV4A, 1× for SV6~8A)
oStopper pipe Ø15.9mm (1× for SV1A, 3× for SV4A, 2×
for SV6~8A)
pStopper pipe Ø22.2mm
qLiquid header reducer pipe (Ø15.9→9.5mm)
rLiquid header reducer pipe (Ø15.9→12.7mm)
sGas branch expander pipe (Ø15.9→19.1mm) (1× for
SV1A for connection to FXMA200/250)
tGas header reducer pipe (Ø22.2→15.9mm)
uGas header reducer pipe (Ø22.2→19.1mm)
vGas header expander pipe (Ø22.2→28.6mm)
11 About the unit and options
11.1 Identification
NOTICE
When installing or servicing several units at the same time,
make sure NOT to switch the service panels between
different models.
11.1.1 Identification label: SV unit
Location
11.2 About the operation range
INFORMATION
For the operation limits, see "13.1.1 Installation site
requirements of the unit"[423].
11.3 System layout
WARNING
The installation MUST comply with the requirements that
apply to this R32 equipment. For more information, see
"12Special requirements for R32 units"[413].
INFORMATION
The following figure is an example and may NOT
completely match your system layout
a
c
de
g
i
f
e
cc
e
h
ii i
b
e
j
aHeat pump outdoor unit
bSafety valve unit (SV)
cVRV direct expansion (DX) indoor unit
dVRV direct expansion (DX) indoor unit (direct connection
from outdoor to indoor)

12 Special requirements for R32 units
Installation and operation manual
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VRV 5 safety valve unit
4P709466-1 – 2023.09
eRemote controller in normal mode
fRemote controller in alarm only mode
gRemote controller in supervisor mode (mandatory in
some situations)
hCentralised controller (optional)
iOption PCB (optional)
jCool/heat changeover remote control switch (optional)
Refrigerant piping
Interconnection and user interface wiring
Direct connection of indoor units to the outdoor unit
11.4 Combining units and options
INFORMATION
Certain options may NOT be available in your country.
11.4.1 Possible options for the SV unit
INFORMATION
All possible options are mentioned in the option list below.
For more information about an option, see the installation
and operation manual of the option.
Duct connection kit (EKBSDCK)
This kit is required when you install ducting on the air inlet side. See
the examples in "13.2Possible configurations"[424] and "13.5.1To
install the ducting"[427].
This kit can also be used when measuring the airflow. See
"17.2.3About measuring the airflow rate"[442].
Joint kit (EKBSJK)(only for SV4~8A)
This kit is required when you make a connection with e.g.
FXMA200A and FXMA250A. When using the joint kit, change the
DIP switch settings. See "15.5To set the DIP switches"[436].
Drain up kit (K-KDU303KVE)
▪ Only this optional drain up kit can be used on the SV unit. Do NOT
use another drain pump kit.
▪ Do NOT route the interconnection wiring of the SV unit together
with the power supply wire of the drain up kit.
▪ Route the power supply wire and relay harness of the drain up kit
inside the SV unit as shown in the figure below.
▪ Position the ferrite core on the relay harness of the drain up kit
inside the switch box of the SV unit.
c
SV1~8A
X1M
X3M
X2M
SV6~8A SV4~8A
c
SV1A
SV6~8=X4M
SV4A=X3M X3M
e
X15A
fg
c c c c b c
d
c
a
aPower supply for the SV unit
bInterconnection wiring
cCable tie
dPower supply of the drain up kit
eRelay harness of the drain up kit
fRelay connector of the drain up kit
gFerrite core
12 Special requirements for R32
units
12.1 Installation space requirements
NOTICE
▪ The pipework shall be securely mounted and guarded
protected from physical damage.
▪ Keep the pipework installation to a minimum.
12.2 System layout requirements
The VRV 5 heat pump uses R32 refrigerant, which is rated as A2L
and is mildly flammable.
To comply with the requirements of enhanced tightness refrigerating
systems of the IEC60335-2-40, this system is equipped with shut-off
valves in the SV unit and an alarm in the remote controller.
The safety measures that are needed for the SV unit are explained
in more detail below. If they are followed, no additional safety
measures for the SV unit are required. Carefully follow the
installation requirements for the SV unit as explained in this manual.
Follow the installation requirements described in the outdoor unit
and indoor unit installation and operation manuals to ensure that the
complete system is compliant with legislation.
Outdoor unit installation
For installation of the outdoor unit, see the installation and operation
manual delivered with the outdoor unit.
Indoor unit installation
Room area limitations apply for the indoor units. Details are
explained in the installation and operation manual delivered with the
outdoor unit. For installation of the indoor unit, see the installation
and operation manual delivered with the indoor unit. For
compatibility of indoor units, see the latest version of the technical
data book of the outdoor unit.
Remote controller requirements
To install the remote controller, see the installation and operation
manual delivered with the remote controller. For requirements on
where and how to use a remote controller and which type to use,
see the installation and operation manual delivered with the outdoor
unit.
SV unit installation
Depending on the room size in which the SV unit is installed and the
total amount of refrigerant in the system, other safety measures are
necessary. See "12.3 To determine the required safety
measures" [4 14]. For the total amount of refrigerant in the system,
see the installation and operation manual delivered with the outdoor
unit.
A terminal for external output is available in the SV unit. This SVS
output can be used when additional countermeasures are needed,
or when the SV unit is installed in a room size where an external
alarm is a sufficient safety measure. The SVS output is a potential-
free contact on terminal X6M that closes in case a refrigerant leak is
detected or if the R32 sensor of the SV unit fails or is disconnected.
For more information about the SVS output, see "15.6 To connect
the external outputs"[436].

12 Special requirements for R32 units
Installation and operation manual
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4P709466-1 – 2023.09
Piping requirements
CAUTION
Piping MUST be installed according to instructions given in
"14 Piping installation" [4 30]. Only mechanical joints (e.g.
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
Low temperature solder alloys shall not be used for pipe
connections.
For piping installed in the occupied space, make sure that the piping
is protected against accidental damage. Piping should be checked
according to the procedure as mentioned in the installation and
operation manual delivered with the outdoor unit.
12.3 To determine the required safety
measures
Step 1 – Determine the total amount of refrigerant in the system.
See the installation and operation manual delivered with the outdoor
unit.
Step 2 – Determine the area of the room in which the SV unit is
installed:
The room area can be determined by projecting the walls, doors and
partitions to the floor and calculating the enclosed area.
Spaces connected by only false ceilings, ductwork, or similar
connections are not considered a single space.
Step 3 – Use the graphs or tables (see "Figure 1" [4 2] at the
beginning of this manual) to determine the required safety measures
for the SV unit.
mTotal refrigerant charge in the system [kg]
Amin Minimum room area [m²]
(a) Lowest underground floor (=Lowest underground floor)
(b) All other floors (=All other floors)
(c) No safety measure (=No safety measure)
(d) External alarm OR Natural ventilation (=External alarm
OR Natural ventilation)
(e) Ventilated enclosure (=Ventilated enclosure)
(f) Ventilated enclosure OR External alarm + natural
ventilation (=Ventilated enclosure OR External alarm +
natural ventilation)
Use the total amount of refrigerant in the system and the area of the
room in which the SV unit is installed to check which safety measure
is required.
Note: When "No safety measure" is required, it is still allowed to
apply natural ventilation or install an external alarm or ventilated
enclosure if wanted. Follow the respective instructions as described
further below.
Note: When natural ventilation is required, it is still allowed to install
an external alarm or ventilated enclosure if wanted. Follow the
respective instructions as described further below.
Note: When an external alarm is required as safety measure, it is
also allowed to install a ventilated enclosure. Follow the instructions
described further below.
Use the first graph (Lowest underground floor(a)) in case the SV unit
is installed in the lowest underground floor of a building. For other
floors, use the second graph (All other floors(b)).
OTHER FLOORS
LOWEST UNDERGROUND FLOOR
The graphs and table are based on an installation height of the SV
unit between 1.8m and 2.2m. The installation height is the height of
the bottom of the SV unit to the floor. See also "13.1.1 Installation
site requirements of the unit"[423].
If the installation height is more than 2.2m, different boundaries for
the applicable safety measures can apply. To know which safety
measure is required in case the installation height is more than
2.2m, refer to the online tool (VRV Xpress).
NOTICE
SV units cannot be installed lower than 1.8 m from the
lowest point of the floor.
Example
The total amount of refrigerant in the VRV system is 20kg. All SV
units are installed in spaces that do NOT belong to the lowest
underground floor of the building. The space in which the first SV
unit is installed has a room area of 50 m², the space in which the
second SV unit is installed has a room area of 15m².
▪ Based on the graph for "All other floors" (All other floors), the room
area limit is 40m² for No safety measure" (No safety measures).
▪ This means that the following safety measures are required:
SV unit Room area Required safety measure
1 A=50m²≥40m² No safety measures
2 A=15m²<40m² Ventilated enclosure OR
External alarm + natural
ventilation
0
10
20
30
40
50
70
90
110
80
60
100
510 20 30 40 50
2515 35 45 m[kg]
Amin [m2]
No safety measure (c)
Ventilated enclosure
OR
External alarm + natural ventilation
(f)
mTotal refrigerant charge in the system [kg]
Amin Minimum room area [m²]
(a) Lowest underground floor (=Lowest underground floor)
(b) All other floors (=All other floors)
(c) No safety measure (=No safety measure)
(d) External alarm OR Natural ventilation (=External alarm
OR Natural ventilation)
(e) Ventilated enclosure (=Ventilated enclosure)
(f) Ventilated enclosure OR External alarm + natural
ventilation (=Ventilated enclosure OR External alarm +
natural ventilation)

12 Special requirements for R32 units
Installation and operation manual
15
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
12.3.1 Overview: flowchart
Procedure to check required
countermeasure for SV unit
Determine area of room in which
SV unit is installed.
Determine total amount of
refrigerant in the system. See Step
1in above text
See Step 2in above text
See Step 3in
above text
See Step 3in
above text
Determine required safety
measure based on ‘Lowest
underground floor’ of the graph
and table.
Determine required safety
measure based on ‘All other
floors’ of the graph and table.
A[m²]
YESNO
SV unit installed on
lowest underground floor?
Ventilated enclosure
No safety measure No safety measure External alarm
Natural ventilation
External alarm +
Natural ventilation
Ventilated enclosure
Total charge amount [kg]
+
OR OR
Note: The flowchart is an overview. Always refer to the full text mentioned in this manual for clear understanding and detailed explanation.

12 Special requirements for R32 units
Installation and operation manual
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12.4 Safety measures
12.4.1 No safety measure
When the room area is sufficiently large, no safety measures are
required. This also includes a SV unit installed in the lowest
underground floor.
The duct connection must be replaced with the duct closing plate
accessory (see "13.5.2To install the duct closing plate"[427]).
Field settings
No safety measure
Code Description Value
[2-0](a) Cluster indication 0 (default): disable
[2-4](b) Safety measures 0: disable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.
12.4.2 External alarm
Do NOT use the external alarm safety measure in case the SV unit
is installed in an occupied space where people are restricted in their
movement.
For the external alarm safety measure, the duct connection must be
replaced with the duct closing plate accessory (see "13.5.2To install
the duct closing plate"[427]).
An external alarm circuit (field supply) must be connected to the SVS
output of the SV unit, see "15.6 To connect the external
outputs"[436].
This alarm system must warn audibly AND visibly (e.g. a loud buzzer
AND a flashing light). The audible alarm must be 15dBA above the
background sound level at all times.
At least one alarm must be installed in the occupied space in which
the SV unit is installed.
For the occupancy listed below, the alarm system must additionally
warn at a supervised location with 24-hour monitoring:
▪ with sleeping facilities.
▪ where an uncontrolled number of people are present.
▪ accessible for persons not familiar with the necessary safety
precautions.
To warn at a supervised location, connect a supervisor remote
controller to the system. This supervisor remote controller can be
connected to any indoor unit of the system, and will warn at the
supervised location in case a refrigerant leak is detected in any SV
unit of the system. Note: An address number for the supervisor
remote controller must be assigned to the SV unit. See "16.1Making
field settings"[437].
When the R32 sensor in the SV unit detects a refrigerant leak, the
SVS output will close and activate the alarm. An error message will
display on the remote controllers of the connected indoor units. See
"20Troubleshooting"[444].
Field settings
External alarm
Code Description Value
[2-0](a) Cluster indication 0 (default): disable
[2-4](b) Safety measures 1 (default): enable
[2-7](b) Ventilated enclosure 0: disable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.
12.4.3 Natural ventilation
Natural ventilation is a safety measure where ventilation is made to a
place where sufficient air is available to dilute the leaked refrigerant
such as a large space.
The duct connection must be replaced with the duct closing plate
accessory (see "13.5.2To install the duct closing plate"[427]).
The natural ventilation safety measure can be applied by following
the steps below:
Step 1 – Determine total room area, which is the total area of the
space that has natural ventilation and the space in which the SV unit
is installed:
The respective room area can be determined by projecting the walls,
doors and partitions to the floor and calculating the enclosed area.
Spaces connected only through false ceilings, ductwork, or similar
connections are not considered a single space.
Step 2 – Use the graph or table below to determine the total
refrigerant charge limit in the system:
Note: Round down the derived values.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
50 25 30 35 40 45 50 55 60 65201510 70 75 80
m [kg]
A1+ Amin
[m2]
A1+ Amin [m²] m [kg]
20 6.7
30 10.1
40
0 0
10 3.3
13.5
50 16.8
60 20.2
70 23.6
80 27.0
90 30.3
100 33.7
110 37.1
120 40.5
130 43.9
140 47.2
150 50.6
160 54.0
170 57.4
180 60.7
190 64.1
200 67.5
210 70.9
220 74.2
230 77.6
236 79.6
237 79.8
240 79.8
250 79.8
mTotal refrigerant charge in the system [kg]
A1Area of the room with natural ventilation [m²]
Amin Minimum room area of the space in which the SV unit is
installed [m²]
The graphs and table are based on an installation height of the SV
unit between 1.8m and 2.2m. The installation height is the height of
the bottom of the SV unit to the floor. See also "13.1.1 Installation
site requirements of the unit"[423].
If the installation height is more than 2.2m, higher total refrigerant
charge limit of the system can apply. To know the total refrigerant
charge limit of the system in case the installation height is more than
2.2m, refer to the online tool (VRV Xpress).
Step3 – The total amount of refrigerant in the system MUST be less
than the refrigerant charge limit derived from the graph above. If
NOT, natural ventilation safety measure is not allowed.
Step4 – The partition between two rooms on the same floor MUST
meet one of the following two requirements for natural ventilation.
▪ Rooms on the same floor that are connected with a permanent
opening that extends to the floor and is intended for people to
walk through.

12 Special requirements for R32 units
Installation and operation manual
17
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
▪ Rooms on the same floor connected with permanent openings
that fulfil the requirements listed below. The openings must
consist out of two parts to allow air circulation for natural
ventilation.
Anvmin
≥ 20 mm
≥ 50% Anvmin
≤ 100 mm
1500
mm
300
mm
200
mm
≥ 20 mm
Anvmin Minimal natural ventilation area
For the lower opening:
▪ It is not an opening to the outside
▪ The opening cannot be closed
▪ The opening must be ≥0.012m² (Anvmin)
▪ The area of any openings above 300 mm from the floor does
not count when determining Anvmin
▪ At least 50% of Anvmin is less than 200mm above the floor
▪ The bottom of the lower opening is ≤100mm from the floor
▪ The height of the opening is ≥20mm
For the upper opening:
▪ It is not an opening to the outside
▪ The opening cannot be closed
▪ The opening must be ≥0.006m² (50% of Anvmin)
▪ The bottom of the upper opening must be ≥1500mm above the
floor
▪ The height of the opening is ≥20mm
Note: The requirement for the upper opening can be met by false
ceilings, ventilation ducts or similar arrangements that provide an
airflow path between the connected rooms.
Example
The total amount of refrigerant in the VRV system is 20kg. The VRV
system has one SV unit which is installed in space that does not
belong to the lowest underground floor of the building. The space in
which the SV unit is installed has a room area of 25m². An adjacent
room has a room area of 45m² to which air circulation is possible
through a partition that meets one of the two requirements in the
above text. The safety measure chosen is External alarm + Natural
ventilation instead of Ventilated enclosure (based on the total
amount of refrigerant and room area from the graph for “All other
floors”).
1To apply the External alarm safety measure, see
"12.4.2External alarm"[416].
2In addition, apply the Natural ventilation safety measure: total
room areas of installed room and adjacent room where natural
ventilation can be made: 25m²+45m²=70m²
▪ Total refrigerant charge limit for the system determined using
the graph for natural ventilation is 23.6kg.
Total amount of refrigerant in the system (20 kg) < Total refrigerant
charge limit (23.6kg), which means that the safety measure can be
applied.
Field settings
Natural ventilation
Code Description Value
[2-0](a) Cluster indication 0 (default): disable
[2-4](b) Safety measures 0: disable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
Note: If the natural ventilation safety measure is used in conjunction
with the external alarm safety measure, then the field settings for
external alarm safety measure MUST be made during configuration.
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.
12.4.4 Ventilated enclosure
WARNING
If the ventilated enclosure safety measure is applied, the
SV unit must have its own ductwork and extraction fan. Do
NOT combine this ductwork with ducting for other
purposes.
A ventilated enclosure is required as a safety measure in case other
safety measures (see "12.4.1 No safety measure" [4 16],
"12.4.3Natural ventilation"[416] and "12.4.2External alarm"[416])
are not allowed.
For the ventilated enclosure safety measure, ductwork and an
extraction fan MUST be installed. See "13.5Installing the ventilation
ducting" [4 27] for ductwork (field supply) installation and "15.6 To
connect the external outputs" [4 36] to connect the extraction fan
circuit (field supply) to the SV unit.
Note: As an additional safety measure, an external alarm circuit
(field supply) can be installed using the SVS output. See "15.6 To
connect the external outputs"[436].
When the R32 sensor in the SV unit detects a refrigerant leak, it
activates the safety measures. This includes opening the damper of
the unit to allow air to enter, activate the fan output signal to trigger
an extraction fan to operate and evacuate the refrigerant leak, and
display an error message on the remote controllers of the connected
indoor units.
A damper at the air inlet of the SV unit enables a choice between
three types of configurations (see below).
a
aDamper
Respect the following rules:
Ductwork The evacuation ductwork MUST vent outside the
building.
Avoid that dirt, dust and small animals can enter
the ductwork and lead to an obstruction. Example:
Install a non-return valve, grill, filter or other
component in the evacuation duct.
Extraction fan The extraction fan must have a CE marking and
cannot act as an ignition source during normal
operation. This requirement is met if the fan motor
has an IP4X rating or better.

12 Special requirements for R32 units
Installation and operation manual
18
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Replacement
air
Make sure that sufficient replacement air is
available for the extraction of a refrigerant leak.
The extraction airflow rate must be maintained for
at least 8hours. This is achieved by providing a
sufficiently large air volume around the SV unit or
by providing sufficient replacement air around the
SV unit (e.g. natural openings or a dedicated
opening in the false ceiling).
Maintenance Maintain the evacuation channel to avoid dust and
dirt from building up and obstructing the flow path.
One SV unit – one extraction fan
In the most simple configuration, each SV unit in the system has its
own evacuation channel and its own extraction fan.
a b c
aSV unit
bDuctwork
cExtraction fan
An extraction fan must be connected to the SV unit, see "15.6 To
connect the external outputs"[436].
In order to size the fan, calculate the required pressure capacity. The
total pressure drop in the evacuation channel consists of multiple
parts: the pressure drop generated by the SV unit and the pressure
drop generated by the components of the ductwork.
Select an airflow rate for the evacuation that meets the legal
requirements. This means that the airflow rate is above the legally
required minimum, and generates sufficient pressure difference
inside the SV unit when compared with the pressure of the
surroundings. The minimum required airflow rate (AFROUT) is
18.8 m³/h, and the pressure drop generated by the SV unit should
lead to a pressure inside the SV unit (Pinternal) that is more than 20Pa
below the pressure of the surroundings.
a
Pinternal AFROUT
aSV unit
AFROUT Airflow
Pinternal Internal pressure
It is advised to take a safety margin on these minimum values when
designing the evacuation channel in order to account for tolerances
on parts, dirt and dust building up in the evacuation channel over
time, etc.
Note: The internal pressure of the SV unit should not be more than
350Pa below the pressure of the surroundings.
Write down the pressure drop generated by all the components in
the evacuation channel for the selected airflow rate. For the SV unit,
use the curve that presents the pressure at the outlet (POUT) in
function of the airflow rate (AFROUT). See the latest version of the
technical engineering data for the pressure drop curves of the SV
unit.
a
POUT AFROUT
aSV unit
AFROUT Airflow
POUT Outlet pressure
For the pressure drop caused by other components of the
evacuation channel (ducts, bends, etc.), use the curves of the
manufacturer.
Use the airflow rate and the sum of the pressure drops to select a
suitable fan.
Example
a b
d f gi he
c
aSV unit
b~h Ductwork (duct, bend, reducer, expander, non-return
valve, wall grill, etc.)
iExtraction fan
In this example we use a SV8A unit. Use the curve of the internal
pressure inside the SV unit (Pinternal) in function of the airflow rate
(AFROUT). When an airflow rate of 115m³/h is selected, the pressure
inside the SV unit is 38Pa below the pressure of the surroundings.
So this airflow rate is above the required 18.8m³/h and the pressure
inside the SV unit is within the range of 20~350 Pa below the
pressure of the surroundings. We use this 115m³/h airflow rate for
further calculations.
-
38.01
115
P
INTERNAL
[Pa]
-300
-250
-200
-150
-100
0
0
50
100
150
200
250
300
-50
AFR
OUT
[m³/h]
Note: These curves present the internal pressure of the SV unit
compared to an ambient pressure of 101325Pa.
Use the curve of the outlet pressure (POUT) in function of the airflow
rate (AFROUT) for the SV unit. With an airflow rate of 115 m³/h, the
resulting pressure drop generated by the SV unit is 38.3Pa.
-300
-250
-200
-150
-100
0
0
50
100
150
200
250
300
-50
P
OUT
[Pa]
AFR
OUT
[m³/h]
-
38.33
115
Use the curves, with instructions how to read them, of the
manufacturer of the components to find the pressure drop generated
by all components in the ductwork. A conversion of units might be
required. Beware that for ducting, the pressure drop from the
manufacturer might be given per unit length of ducting (units are for
example Pa/m). Multiply this value by the duct length to find the total
pressure drop.
AFR [m³/h]
AFR [m³/h]
ΔP
[Pa/m]
ΔP
[Pa]
115
1
115
8
Ducting Bends
EXAMPLE
Write down the pressure drop of each component in an overview
table. Sum up the pressure drops.
Nº Indication Type AFR [m³/h] Length [m] ∆P [Pa/m] ∆P [Pa]
1 a SV unit 115 - - 38.3
2 b Duct “ 5 1 5
3 c Bend “ - - 8
4 b Duct “ 10 1 10
5 c Bend “ - - 8

12 Special requirements for R32 units
Installation and operation manual
19
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Nº Indication Type AFR [m³/h] Length [m] ∆P [Pa/m] ∆P [Pa]
6 b Duct “ 2 1 2
7 d Expander “ - - 4
8 e Duct “ 6 0.5 3
9 f Reducer “ - - 6
10 b Duct “ 2 1 2
11 b Duct “ 1 1 1
12 g Non-return valve “ - - 11
13 b Duct “ 1 1 1
14 h Wall grill “ - - 15
Total pressure drop (sum of rows 1 to 14) 114.3
Select a fan with the required flow of 115m³/h and a total pressure
rise of 114.3Pa.
Note: For ease of installation, we recommend to use in-line duct
fans.
An online tool (VRV Xpress) is available to find the required pressure
capacity for selecting the correct fan size. Only use this online tool
for the calculation.
Field settings
One SV unit – one extraction fan
Code Description Value
[2-0](a) Cluster indication 0 (default): disable
[2-4](b) Safety measures 1 (default): enable
[2-7](b) Ventilated enclosure 1 (default): enable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.
Multiple SV units in parallel – one extraction fan
In this configuration, multiple parallel SV units are connected to a
single extraction fan. Each SV unit benefits from a direct airflow path
to the extraction fan. In case of a refrigerant leak in any SV unit, the
damper of that SV unit will open and allow direct air evacuation to
the extraction fan. The dampers of the other SV units remain closed.
a1
a2
a...
b c
a#SV unit #
bDuctwork
cExtraction fan
It is sufficient to connect the extraction fan circuit to only one SV unit
of the cluster (=SV units that belong to the same ductwork and
extraction fan) (see "15.6To connect the external outputs"[436]). If
in a cluster there are SV units that belong to different outdoor unit
systems, the fan circuit must be connected to one SV unit (in the
cluster) of each outdoor unit system.
Example
a
a
a
A
c e
c e
d e
e
f
b
a
a
A
c e
d e
d e
e
B
e
f
aSV unit belonging to outdoor unit A
bSV unit belonging to outdoor unit B
cExtraction fan output terminal – NOT connected
dExtraction fan output terminal – connected
eInterconnection wiring terminal
fExtraction fan
AOutdoor unit A
BOutdoor unit B
Interconnection wiring
Extraction fan output wiring
An online tool (VRV Xpress) is available to find the required pressure
capacity for selecting the correct fan size. Only use this online tool
for the calculation.
Field settings
Multiple SV units in parallel – one extraction fan
Code Description Value
[2-0](a) Cluster indication 1: enable
[2-1](a) Cluster number #(b)
[2-2](a) Cluster configuration 0 (default): parallel
[2-4](c) Safety measures 1 (default): enable
[2-7](c) Ventilated enclosure 1 (default): enable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Assign a unique cluster number to each cluster in the system. All
SV units in the same cluster MUST have the same cluster
number.
(c) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.
Multiple SV units in series – one extraction fan
In this configuration, multiple SV units are connected in series to a
single extraction fan. The air flows through every SV unit to the
extraction fan. In case of a refrigerant leak in any SV unit, the
dampers of all SV units will open and allow air evacuation to the
extraction fan.
a a a db cc bb
aSV unit
bDuctwork
cEKBSDCK
dExtraction fan
It is sufficient to connect the extraction fan circuit to only one SV unit
of the cluster (see "15.6To connect the external outputs"[436]). It
is not allowed to have SV units in the same series cluster that belong
to different outdoor unit systems.

12 Special requirements for R32 units
Installation and operation manual
20
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Example
a a a f
c e c e d e
A
e
a b b f
d e c e d e
A
e
B
e
aSV unit belonging to outdoor unit A
bSV unit belonging to outdoor unit B
cExtraction fan output terminal – NOT connected
dExtraction fan output terminal – connected
eInterconnection wiring terminal
fExtraction fan
AOutdoor unit A
BOutdoor unit B
Interconnection wiring
Extraction fan output wiring
Allowed
NOT allowed
The option kit EKBSDCK is required each time a duct is connected
to the air inlet (damper side) of the SV unit.
An online tool (VRV Xpress) is available to find the required pressure
capacity for selecting the correct fan size. Only use this online tool
for the calculation.
Field settings
Multiple SV units in series – one extraction fan
Code Description Value
[2-0](a) Cluster indication 1: enable
[2-1](a) Cluster number #(b)
[2-2](a) Cluster configuration 1: series
[2-4](c) Safety measures 1 (default): enable
[2-7](c) Ventilated enclosure 1 (default): enable
(a) Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b) Assign a unique cluster number to each cluster in the system. All
SV units in the same cluster MUST have the same cluster
number.
(c) Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "16.1Making field settings"[437].
SV unit test run
Before SV unit operation, it is required to perform a test run that
simulates a refrigerant leak. See "17.2 SV unit test run" [4 41] for
more details.