Daikin VRV 5-S Series Installation And Operation Manual page 12

2 Specific installer safety instructions
For the lower opening:
▪ The opening cannot go outdoors
▪ The opening cannot be closed
▪ The lower 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
nvmin
floor
▪ The bottom of the lower opening is ≤100 mm from the
floor
▪ The height of the openings is ≥20 mm
For the upper opening:
▪ The opening cannot go outdoors
▪ The opening cannot be closed
▪ The upper 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
drop ceilings, ventilation ducts or similar arrangements that
provide an airflow path between the connected rooms.
2 Depending on the installation height of the indoor units, different
values may be used in the next step IF:
▪ installation height is1.8≤x<2.2 m, then use the charge limit of
the graph for wall-mounted units.
▪ installation height is ≥2.2 m, then use the charge limit of the
graph for ceiling-mounted units.
NOTICE
Wall mounted units cannot be installed lower than 1,8 m
from the lowest point of the floor. Ceiling mounted units
cannot be installed lower than 2,2 m from the lowest point
of the floor.
3 Use the graph or table (see " figure 4" [ 4 3] at the beginning of
this manual) to determine the total refrigerant charge limit in the
system.
In case there are any underground floors in the building, there
are special requirements for the maximum allowable charge.
The maximum allowable charge is determined by using graph
(a), (b) or (d) for room with the smallest area on the lowest
underground floor.
The maximum allowable charge has to be assessed for the
room with the smallest room area in both the lowest
underground floor and the other floors.
The lowest maximum allowable charge of both MUST be used.
Installation and operation manual
12
)
nvmin
nvmin
is less than 200 mm above the
)
nvmin
OTHER FLOORS
Curve (c) = room area ≥10 m²
LOWEST UNDERGROUND FLOOR
Curve (d) = room area ≥15 m²
Curve (a) OR (b) = room area <15 m²
m Total refrigerant charge limit in the system
A Smallest room area
min
(a) Ceiling-mounted unit (= Ceiling-mounted unit)
(b) Wall-mounted unit (= Wall-mounted unit)
(c) Smallest room NOT in lowest underground floor
(=Smallest room NOT in lowest underground floor)
(d) Smallest room in lowest underground floor (=Smallest
room in lowest underground floor)
Note: The derived charge value should be rounded down.
4 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 29].
refrigerant
5 The total refrigerant charge in the system MUST be less
than the total refrigerant charge limit value that is derived
from the graph. If NOT, change the installation (see choices
below) and repeat all of the above steps.
1. Increase the area of smallest room.
OR
2. Decrease the piping length by changing the system layout.
OR
3. 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 "15.4 To connect the external
outputs" [ 4 33].
NOTICE
The total refrigerant charge amount in the system MUST
always be lower than the number of connected indoor units
x15.96 [kg], with a maximum of 63.84 kg.
E.g. In a system with 1 indoor unit, the maximum
refrigerant charge amount is: 1x15.96=15.96 kg.
Example 1:
kg
kg
kg
tCO eq
2
(a)
+additional charge =3.4 kg+R
"14.2 To determine the additional
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1A – 2020.01