Daikin VRV 5 BS4A14AJV1B Manual page 103

18.3.3 About measuring the airflow rate
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
Example
A BS12A unit with an airflow rate during the test run of 115 m³/h. The pressure
drop graph shows that this results in an internal pressure which is 42.9 Pa below
the ambient pressure. Both requirements are met:
▪ The pressure inside the BS unit is more than 20 Pa below the ambient pressure
(42.9 Pa).
▪ The airflow rate is higher than 77 m³/h (115 m³/h).
115
0 50 100
0
-42.9
-50
-100
-150
-200
-250
-300
Y
X Airflow rate [m³/h]
Y Internal pressure below ambient pressure [Pa]
See the latest version of the technical engineering data for the BS unit's pressure
drop curves.
It is up to the installer to measure the airflow rate and provide correct data. We
advise 2 ways in the sections below, but the installer is entirely free on how to
perform the measurement.
About measuring with a vane anemometer
▪ Where: Measure the airflow rate at the air inlet (damper) of the BS unit.
▪ Tip: Use the duct connection kit (EKBSDCK) and an anemometer with a funnel to
conduct the entire airflow through the anemometer.
▪ Postrequisite: Remove the kit once the measurement is finished.
a Vane anemometer
b Duct connection kit (EKBSDCK)
About measuring with a hot wire probe anemometer
▪ Attention: In case you need to drill holes in the ducting, choose a location
without thermal insulation.
▪ Where: Measure the airflow rate in the duct connected to the air outlet of the BS
unit.
▪ Postrequisite: Close the holes properly once the measurement is finished.
150 200 250 300
X
b
a
18 Commissioning
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Installer and user reference guide
103