Daikin EHVZ04S18EA6V, Installer'S Reference Manual

Page: 56 / 272

7 | Unit installation
Installer reference guide
56
ERGA04~08EA + 08S18+23EA
Daikin Altherma 3 R F
4P629093-1A – 2021.11
PATTERN 4
PATTERN 4 is only allowed for installations in technical rooms (i.e. room that is
NEVER occupied by persons). For this pattern there are no requirements to the
minimum floor area if you provide 2 openings (one at the bottom, one at the top)
between the room and the outside to ensure natural ventilation. The room must
be protected from frost.
Anv (≥A
nv-min
)
Min. 50% of A
nv-min
a2
a1
A
A Unoccupied room where the indoor unit is installed.
Must be protected from frost.
a1 A
nv
: Bottom opening for natural ventilation between the unoccupied
room and the outside.
▪ Must be a permanent opening that cannot be closed.
▪ Must be above ground level.
▪ Must be completely located between 0 and 300 mm from the floor of
the unoccupied room.
▪ Must be ≥A
nv-min
(minimum bottom opening area as specified in the
table below).
▪ ≥50% of the required opening area A
nv-min
must be ≤200 mm from the
floor of the unoccupied room.
▪ The bottom of the opening must be ≤100 mm from the floor of the
unoccupied room.
▪ If the opening starts from the floor, the height of the opening must be
≥20 mm.
a2 Top opening for natural ventilation between room A and the outside.
▪ Must be a permanent opening that cannot be closed.
▪ Must be ≥50% of A
nv-min
(minimum bottom opening area as specified in
the table below).
▪ Must be ≥1.5 m from the floor of the unoccupied room.
A
nv-min
(minimum bottom opening area for natural ventilation)
The minimum bottom opening area for natural ventilation between the
unoccupied room and the outside depends on the total refrigerant in the system.
For intermediate refrigerant charges, use the row with the higher value.
Example:
If the refrigerant charge is 4.3 kg, use the row of 4.4 kg.
Total refrigerant charge (kg) A
nv-min
(dm²)
2 7.2
2.2 7.5