Daikin SV1A25AJV1B - Page 53

13 | Special requirements for R32 units
Installer and user reference guide
53
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
Note: As an additional safety measure, an external alarm circuit (field supply) can
be installed using the SVS output. See "16.5 To connect the external
outputs"[498].
When the R32 sensor in the SV 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 SV unit enables a choice between three 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. This requirement
is met if the fan motor has an IP4X rating or better.
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 8hours. This is achieved by
providing a sufficiently large air volume around the SV unit or
by providing sufficient replacement air around the SV unit
(e.g. natural openings or a dedicated opening in the false
ceiling).
Maintenance Maintain the evacuation channel to avoid dust and dirt from
building up and obstructing the flow path.
One SV unit – one extraction fan
In the most simple configuration, each SV unit in the system has its own evacuation
channel and its own extraction fan.
a b c
a SV unit
b Ductwork
c Extraction fan
An extraction fan must be connected to the SV unit, see "16.5 To connect the
external outputs"[498].