Daikin SV1A25AJV1B - About Airflow Requirements

18 | Commissioning
Installer and user reference guide
111
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
▪ External alarm: all SV units with an external alarm.
▪ Natural ventilation: all SV units with natural ventilation
▪ Ventilated enclosure – one SV unit to one extraction fan configuration: all SV
units with a ventilated enclosure – one-to-one configuration.
▪ Ventilated enclosure – multiple SV units to one extraction fan, parallel
configuration: all SV units with a ventilated enclosure – parallel configuration.
▪ Ventilated enclosure – multiple SV units to one extraction fan, series
configuration: only one SV unit with a ventilated enclosure – series
configuration. Tip: choose the SV unit which is most upstream, where the air inlet
(damper) is free and you can measure the airflow rate.
Example
In the example below: change the setting [2-3] to start the test run for the
following SV units: a, b, d, e, f, g and h.
l
k
k
a
b
c
d
e
g f
j
h
k
i
a SV unit in one-to-one configuration
b SV unit in series configuration
c SV unit in series configuration
d SV unit in parallel configuration
e SV unit in parallel configuration
f SV unit without safety measures
g SV unit with external alarm
h SV unit with natural ventilation
i Natural ventilation
j External alarm
k Extraction fan
l Outdoor unit
Interconnection wiring
In case the safety measures demand a ventilated enclosure, the SV unit test run
has to include a measurement of the actual extraction airflow rate to confirm that
it meets the legal requirements.
NOTICE
It is very important that all refrigerant piping work is done before the units (outdoor,
SV or indoor) are powered. When the units are powered, the expansion valves
initialise. This means that the valves close.
If any part of the system had already been powered before, FIRST activate setting
[2-21] on the outdoor unit to open the expansion valves again THEN power off the
unit to conduct the SV unit test run.
18.3.2 About airflow requirements
When a ventilated enclosure is required, the following requirements apply: