Daikin VRV 5-S - Page 73

16 | Special requirements for R32 units
Installer and user reference guide
73
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
About the charge limit
The charge limit must be determined separately for each SV unit branch pipe port.
This is possible because of the shut-off valves in the SV unit. The maximum amount
of refrigerant that can escape in case of a leak is determined by the piping length
and indoor heat exchanger size. This is directly linked to the downstream indoor
unit capacity of this piping section.
In case a leak is detected in an indoor unit, the shut-off valves in the SV unit of the
respective port will close. The piping section with the leak is now shut off from the
rest of the system and the amount of refrigerant that can leak is significantly
reduced.
Note: When two branch pipe ports are combined in order to form a single branch
pipe port (e.g. FXMA200/250), they must be considered as a single branch pipe
port.
To determine the charge limit
Step1 – Determine the smallest area out of:
▪ Each of the rooms served by SV unit branch pipe port where an indoor unit is
installed
▪ Each of the rooms served by a ducted indoor unit installed in a different room
The room area can be determined by projecting the walls, doors and partitions to
the floor and calculate the enclosed area. Spaces connected by only false ceilings,
ductwork, or similar connections are NOT considered a single space.
The area of the smallest room calculated above is used in the next step to
determine the maximum allowable indoor capacity that can be connected to that
port.
Step2 – Use the table below to determine the maximum total indoor unit capacity
(sum of all connected indoor units) that is allowed for a single SV unit branch pipe
port. In case a ducted indoor unit is serving a different room than where it is
installed, the restrictions of the room area apply to both the indoor installation
room and the conditioned room separately. Supply and return air shall be directly
ducted to that room.
Area of installed/conditioned
room [m²]
Maximum total indoor unit capacity class
1 indoor unit per branch pipe
port
(a)
2~5 indoor units per branch pipe port
40m after 1
st
branch
(b)
90m after 1
st
branch
(c)
<5 — — —
5 10 — —
6 25 — —
7 32 — —
8 40 — —
9 71 — —
10 80 — —
11 80 20 —
12 80 25 —
13 80 32 —
14 80 32 —
15 125 40 —
20 140 50 40
25 250 71 71
30 250 125 125
35 250 200 200
40 250 200 200
≥45 250 250 250