Panasonic WH-ADC0309J3E5, Planning And Installation Manual, Page: 106 / 224

106
Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Planning
5
Step C: Determine the minimum venting opening area (VA
min
) for natural ventilation:
1. Determine the excess refrigerant charge quantity (m
excess
), as specified in Table III (see
below).
2. Then determine the minimum ventilation opening area (VA
min
) corresponding to the
determined m
excess
value, as specified in Table III, for natural ventilation between the
installation room and the adjacent room.
3. The unit can be installed in a specific room only if the following conditions are fulfilled:
> Two permanent openings, one at the bottom, another at the top, are made between
the installation room and the adjacent room for ventilation purposes.
Installation
room (A
room
)
Adjacent
room (B
room
)
Top opening
Bottom opening
1,500
mm
> VA
min
> 0.5 VA
min
> The bottom opening fulfills the following requirements:
● Must comply to the minimum area requirement of VA
min
.
● Opening must be located 300 mm from the floor.
● At least 50 % of required opening area must be 200 mm from the floor.
● The bottom of the opening shall not be higher than the point of release when
the unit is installed and must be situated 100 mm above the floor.
● Must be as close as possible to the floor and lower than H.
> The top opening fulfills the following requirements:
● The total size of the top opening must be more than 50 % of VA
min
.
● Opening must be located 1500 mm above the floor.
> The height of the openings must more than 20 mm.
> A direct ventilation opening to outside is NOT encouraged for ventilation opening
(because the user might block the opening when it is cold).
> The value of H is considered as 0.6 m to comply to IEC 60335-2-40:2018 Clause
GG2.
Table III: Minimum venting opening area for natural ventilation
m
c
(kg) m
max
(kg) m
excess
= m
c
– m
max
(kg) Minimum venting opening area (VA
min
) (cm²)
H = 0.6 m
2.27 0.1 2.17 878
2.27 0.3 1.97 797
2.27 0.5 1.77 716
2.27 0.7 1.57 635
2.27 0.9 1.37 570
2.27 1.1 1.17 538
2.27 1.3 0.97 485
2.27 1.5 0.77 414
2.27 1.7 0.57 326
2.27 1.9 0.37 224
Notes:
For H values lower than 0.6 m, the value of H is to be considered as 0.6 m to comply to IEC 60335-2-40:2018 Clause GG2.
For intermediate m
excess
values, the value that corresponds to the higher m
excess
value from the table is to be considered.
Example: m
excess
= 1.45 kg, the value that corresponds to “m
excess
= 1.6 kg” is to be considered.