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Special requirements for R32 units
Installer and user reference guide
41
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
BS unit installation
Depending on the room size in which the BS unit is installed and the total amount
of refrigerant in the system, other safety measures are necessary. See
determine the required safety measures"
41]. For the total amount of
refrigerant in the system, see the installation and operation manual delivered with
the outdoor unit.
A terminal for external output is available in the BS unit. This SVS output can be
used when additional countermeasures are needed, or when the BS unit is
installed in a room size where an external alarm is a sufficient safety measure. The
SVS output is a potential-free contact on terminal X6M that closes in case a
refrigerant leak is detected or if the R32 sensor of the BS unit fails or is
disconnected.
For more information about the SVS output, see
Piping requirements
Piping must be installed according to instructions given in
73]. Only mechanical joints (e.g. braze connections) that are
compliant with the latest version of ISO14903 can be used.
For piping installed in the occupied space, make sure that the piping is protected
against accidental damage. Piping should be checked according to procedure as
mentioned in the installation and operation manual delivered with the outdoor
unit.
13.3 To determine the required safety measures
Step 1
– Determine the total amount of refrigerant in the system. See the
installation and operation manual delivered with the outdoor unit.
Step 2
– Determine the area of the room in which the BS unit is installed:
The room area can be determined by projecting the walls, doors and partitions to
the floor and calculating the enclosed area.
Spaces connected only through false ceilings, ductwork, or similar connections are
not considered a single space.
If the partition between two rooms on the same floor meets the requirements
below, then the rooms are considered as one room and the areas of the rooms can
be added up. In this way, it is possible to increase the area of the room used when
determining the required safety measures.
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.
