16
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Special requirements for R32 units
Installer and user reference guide
64
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
c
Indoor unit
d
Remote controller NOT compatible with R32 safety system
e
Remote controller compatible with R32 safety system
f
Remote controller in supervisor mode
g
Supervisor room
16.3 About the charge limit
The charge limit must be determined separately for
each
BS
unit branch pipe port
.
This is possible because of the shut-off valves in the BS 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 BS 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.
16.4 To determine the charge limit
Step 1
– Determine the smallest room served per BS unit branch pipe port in order
to derive the maximum indoor capacity index that can be connected in total per
branch pipe port:
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 a port of the BS unit is used in the next step to determine the maximum
allowable indoor capacity that can be connected to that port.
Spaces connected by only false ceilings, ductwork, or similar connections shall not
be considered a single space.
If the partition between two 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 two requirements must be met in order to add up room
areas:
▪
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.
▪
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 two parts to allow for air circulation.
