Daikin VRV 5-S Series, Installer And User Reference Manual

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3 | Specific installer safety instructions
Installer and user reference guide
23
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
3.1.3 To determine the charge limitations
1 Determine the area of the smallest room in order to derive the total
refrigerant charge limit in the system:
The room area can be determined by projecting the walls, doors and
partitions to the floor and calculate the enclosed area. The area of the
smallest room being served by the system is used in the next step to
determine the maximum allowable total charge of the system.
Spaces connected by only false ceilings, ductwork, or similar connections
shall not be considered a single space.
If the partition between 2 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
min
value used to calculate the maximum allowed charge.
One of the following 2 requirements must be met in order to add up room
areas.
1 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.
2 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 2 parts to allow for air circulation.
A
nvmin
≥ 20
mm
≥ 50% A
nvmin
≤ 100
mm
1500
mm
300
mm
200
mm
≥ 20 mm
For the lower opening:
- The opening cannot go outdoors
- The opening cannot be closed
- The lower opening must be ≥0.012 m² (A
nvmin
)
- The area of any openings above 300 mm from the floor does not
count when determining A
nvmin
- At least 50% of A
nvmin
is less than 200 mm above the floor
- The bottom of the lower opening is ≤100 mm from the floor
- The height of the openings is ≥20 mm