Daikin VRV 5-S RXYSA4A7V1B Installation And Operation Manual page 20

12 Special requirements for R32 units
If the partition between two rooms on the same floor meets certain
requirements, then the rooms are considered as one room and the
areas of the rooms may be added up. In this way it is possible to
increase the A value used to calculate the maximum allowed
min
charge.
One of the following two requirements must be met to add up room
areas:
▪ 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 can be considered as one room.
▪ Rooms on the same floor connected with openings that fulfil
following requirements can be considered as a single room. The
opening must consist out of two parts to allow for air circulation.
A
nvmin
≥ 50% A
≤ 100 mm
A Minimal natural ventilation area
nvmin
For the lower opening:
▪ It is not an opening to the outside
▪ The opening cannot be closed
▪ The opening must be ≥0.012 m² (A
▪ The area of any openings above 300 mm from the floor does
not count when determining A
▪ At least 50% of A is less than 200 mm above the floor
nvmin
▪ 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 A
▪ 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.
Step 2 – Use the graph or table (see
of this manual) to determine the total refrigerant charge limit in the
system for each indoor unit AND for each room served by a ducted
indoor unit.
4" [ 4 3]:
→ Legend for "Figure
A Smallest room area
m Total refrigerant charge limit in the system
(a) All other floors (=All other floors)
(b) Lowest underground floor (=Lowest underground floor)
(c) Effective installation height (=Effective installation height)
Determine the value for both the lowest underground floor AND the
other floors.
The total refrigerant charge limit depends on the effective installation
height, measured between:
Installation and operation manual
20
≥ 20 mm
≥ 20 mm
nvmin
)
nvmin
nvmin
)
nvmin
4" [ 4 3] at the beginning
"Figure
▪ the bottom side of the indoor unit and the lowest point of the floor,
in case the indoor unit is installed in the same room.
▪ the bottom of the duct opening and the lowest point of the floor, for
rooms served by a ducted indoor unit installed in a different room.
Note: If the height for your installation is not shown, use the closest
lower height value in the table. E.g. for an installation height of
2.7 m, use the value corresponding with height 2.5 m of the table.
Refer to the databook for a more detailed table.
NOTICE
Indoor units and ducting cannot be installed lower than
1.8 m from the lowest point of the floor.
ALL OTHER FLOORS
Choose the curve 'a' that corresponds to the effective
installation height
LOWEST UNDERGROUND FLOOR
Choose the curve 'b' that corresponds to the effective
installation height
Note: The derived charge value should be rounded down.
Step 3 – Determine the total amount of refrigerant in the system:
Contains fluorinated greenhouse gases
R32
1 =
GWP: xxx
2 =
2
1
1 + 2
=
GWP × kg
=
1000
Total charge=Factory charge
(a)
The R value is calculated in
amount" [ 4 28].
refrigerant
Step 4 – The total refrigerant charge in the system MUST be less
than the lowest value of the refrigerant charge limit for each room
where an indoor unit is installed or that is served by a ducted indoor
unit installed in a different room. If NOT, change the installation (see
choices below) and repeat all of the above steps.
1. Increase the area of the room restricting the total charge.
OR
2. Decrease the piping length by changing the system layout.
OR
3. Increase the installation height of the unit or the duct.
OR
4. Add additional countermeasures as described in applicable
legislation.
SVS output or optional output PCB for indoor unit can be
used to connect and activate the additional
countermeasures (e.g. mechanical ventilation). For more
information, see "16.4 To connect the external
outputs" [ 4 32].
kg
kg
kg
tCO eq
2
(a)
+additional charge =3.4 kg+R
"15.2 To determine the additional
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1E – 2023.02