Daikin VRV 5 BS4A14AJV1B Manual page 47

One BS unit – one extraction fan
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
Note: As an additional safety measure, an external alarm circuit (field supply) can
be installed using the SVS output. See
4
outputs" [ 88].
When the R32 sensor in the BS unit detects a refrigerant leak, it activates the
safety measures. This includes opening the damper of the unit to allow air to enter,
activate the fan output signal to trigger an extraction fan to operate and evacuate
the refrigerant leak, and display an error message on the remote controllers of the
connected indoor units.
A damper at the air inlet of the BS unit enables a choice between 3 types of
configurations (see below).
a
a Damper
Respect the following rules:
Ductwork The evacuation ductwork MUST vent outside the building.
Avoid that dirt, dust and small animals can enter the
ductwork and lead to an obstruction. Example: Install a non-
return valve, grill, filter or other component in the evacuation
duct.
Extraction fan The extraction fan must have a CE marking and cannot act as
an ignition source during normal operation. Example:
Brushed DC motors cause sparks and are not allowed.
Fan power must be lower than 2.5 kVA.
Replacement air Make sure that sufficient replacement air is available for the
extraction of a refrigerant leak. The extraction airflow rate
must be maintained for at least 6.5 hours. This is achieved by
providing a sufficiently large air volume around the BS unit or
by providing sufficient replacement air around the BS unit
(e.g. natural openings or a dedicated opening in the false
ceiling).
Maintenance A periodic inspection of the unit is required, during which the
test run is repeated (see
Maintain the evacuation channel to avoid dust and dirt from
building up and obstructing the flow path (see
check of the ventilated
In the most simple configuration, each BS unit in the system has its own evacuation
channel and its own extraction fan.
a b
a BS unit
b Ductwork
c Extraction fan
13 Special requirements for R32 units
|
"16.5 To connect the external
"18.3 BS unit test
enclosure" [
c
4
run" [ 101]).
"7.2 Periodic
4
23]).
Installer and user reference guide
47