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C.1 Airflow Profile
The airflow profile represents the nominal maximum airflow for each individual load segment
when the VAV damper is fully open. By adjusting the airflow profile setting for each segment,
the system’s airflow management algorithm may be fine tuned to compensate for variations in
room and duct size to optimise the airflow.
The default value for each segment is 200 L/s. This is the minimum value and can be adjusted
in increments of 10 up to the 1500 L/s maximum value.
The airflow management algorithm uses the airflow profile values to determine the status
of the VAV system as a whole. The VAV damper position (percentage open) for each load
segment is multiplied by the airflow profile. The sum of these values is the nominal system
airflow requirement for the system.
In the examples on the previous page the following settings will have the desired effect.
Example 1:
Both zones - Airflow profile = 200
Nominal system airflow requirement = 200
Example 2:
Large zone - Airflow profile = 400 Small zone - Airflow profile = 200
Nominal system airflow requirement = 400
C.2 MaxFlow Setpoint
The MaxFlow setpoint determines at what point the airflow management algorithm engages
maximum airflow, in relation to the nominal system airflow requirement. The MaxFlow
setpoint value is expressed in litres per second. The default is 950 L/s from a range of 800 L/s
to 1500 L/s.
Total VAV System Open (%)
d
e
e
p
S
n
a
F
r
o
o
d
nI
95%
#%
m
u
m
i
n
i
M
Maximum
Adjusted
PeakLoad
Setpoint
Default
PeakLoad
Setpoint
The speed of the indoor fan is ramped up and down as the nominal system airflow requirement
fluctuates between the minimum and MaxFlow value.
Typically this will be set to the nominal maximum air flow value for the indoor unit as per the
System Specification table.
Summary of Contents for C-CCT-1210
Page 27: ...To Indoor Unit...
