18
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Commissioning
Installer and user reference guide
102
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
▪
Ventilated enclosure
–
multiple BS
units to 1 extraction fan, parallel
configuration:
all BS units with a ventilated enclosure – parallel configuration.
▪
Ventilated enclosure
–
multiple BS
units to 1 extraction fan, series
configuration:
only 1 BS unit with a ventilated enclosure – series configuration.
Tip: choose the BS 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 BS units: a, b, d, e, f and g.
j
i
i
a
b
c
d
e
g
f
h
i
a
BS unit in one-to-one configuration
b
BS unit in series configuration
c
BS unit in series configuration
d
BS unit in parallel configuration
e
BS unit in parallel configuration
f
BS unit without safety measures
g
BS unit with external alarm
h
External alarm
i
Extraction fan
j
Outdoor unit
Transmission wiring
In case the safety measures demand a ventilated enclosure, the BS 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,
BS 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, setting [2-21] on the
outdoor unit has to be activated to open the expansion valves again.
18.3.2 About airflow requirements
When a ventilated enclosure is required, the following requirements apply:
▪
pressure inside the BS unit has to be more than 20 Pa below the ambient
pressure,
▪
minimum airflow rate:
Model
Minimum airflow rate [m³/h]
BS4A
90
BS6~8A
87
BS10~12A
77
