NT00000535-KSDR-ECOWATT-48-88-120-160-200-AN-190905
43/88
ENGLISH
8 . 2
Constant flow operation (CAV)
CAV
Recommended mode to directly obtain the desired flow rate in an installation.
The fan speed is set to provide a precise flow and to keep it constant.
The supply air flow is controlled. The "Low Speed" and "High Speed” flow setpoints are set
independently in m
3
/h at the ETD remote control.
The pressure transmitter measures the differential pressure on the fan suction chamber.
The airflow resulting from the pressure measurement is calculated by the controller, in relation to a K co
-
efficient specific to the fan.
The switching between the different setpoints will be carried out manually or automatically by a program
-
ming schedule.
The PI control loop of the fan maintains the setpoint by controlling the fan.
A third "night speed" setpoint may be entered from the control panel. The % value corresponds to the per
-
centage of the maximum speed of the fan, and will be used during the night cooling (see corresponding
function).
A delay of 60 seconds is integrated into the programme to ensure the protection of the heating elements
in the event of a request to stop the unit.
Functional configuration of the ETD
Access to the simplified configuration menu (via password 1111) enables:
•
The selection of the Low Speed and High Speed airflow rates of the fan.
•
The night-time setpoint value of the fan.
CAV
CAV Supply
Low speed
High speed
Night speed
8000 m3/h
4000 m3/h
0%
Parameter
Previous
screen
Next screen
Running mode
The selection of this mode in the installer menu automatically configures the user menu screen. The user
can thus change the operation mode of the unit without touching the settings.
Se t t i n g f o r u s e o n t h e ET D
Menu CAV
Off
Low speed
High speed
Auto
CAV
Stop, Low Speed, High Speed
Auto = according to clock or status of the control terminal (start/stop +
LS/HS)
Note: The control by the terminals 31-G0 / 33-G0 is a priority.
