6.1.4 Default settings V
min
and V
max
Default settings of the volume flow controllers with Easy
controller:
V
min
: 40%
V
max
: 80%
During commissioning, the settings can be adjusted
according to the requirements.
6.1.5 Setting constant volume flow control
The setpoint value for a constant volume flow rate is set
on the V
min
potentiometer.
The position of the V
max
potentiometer should be set to
0%.
For the constant volume flow control, no control signal is
required at terminal w.
6.1.6 Setting variable volume flow control
In the case of a variable volume flow control, the vari-
able volume flow rate operating range is set via the
potentiometers V
min
and V
max
, which is controlled via the
control signal at terminal w.
The following points should be noted for the control
input signal:
Usable control range of the VAV terminal unit
Chapter 6.1.1 ‘Control ranges of VAV terminal
V
min
= nominal volume flow rate at control signal (w)
with 0 V DC (not less than 10 or 20%)
V
max
= set volume flow rate at control signal (w) with
10 V DC
In order to achieve a higher resolution of the assign-
ment of 0–10 V voltage signals to the volume flow rate
setpoint values, the operating range can be restricted.
If the value for V
min
is set higher than V
max
, the setting of
V
min
is interpreted as a fixed setpoint value. The setpoint
signal (w) is ignored here.
6.1.6.1
Setting the entire control range for the
control input signal of the central building
management system
If the volume flow rate is to be specified by the central
GLT [BMS] over the entire control range, set the V
min
potentiometer to 0% and the V
max
potentiometer to
100%.
The following points should be noted for the control
input signal:
Usable control range of the VAV terminal unit
Chapter 6.1.1 ‘Control ranges of VAV terminal
The usable control range is available from a 1 V DC
or 2 V DC control signal, depending on the VAV ter-
minal unit type.
If the control signal drops below 0.5 V DC, the
damper blade moves to the shut-off position.
Compliance with a control signal
≤
0.5 V DC is not
always given due to interference voltages on the
supply lines. Therefore, the positive circuit should
always be preferred for a safe shut-off
Commissioning and operation
Setting the Easy controller > Setting variable volume flow control
Control component Easy for VAV terminal units
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