12 Special requirements for R32 units
Installation and operation manual
14
SV1ASV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Piping requirements
CAUTION
Piping MUST be installed according to instructions given in
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
2] at the
beginning of this manual) to determine the required safety measures
for the SV unit.
m
Total refrigerant charge in the system [kg]
A
min
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
site requirements of the unit"
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 (
).
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
5
10
20
30
40
50
25
15
35
45
m
[kg]
A
min
[m
2
]
No safety measure
(c)
Ventilated enclosure
OR
External alarm + natural ventilation
(f)
m
Total refrigerant charge in the system [kg]
A
min
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)
