Daikin R-32 rooftop Series, Operation Manual

Page: 32 / 40

Translation from original instructions
Packaged Rooftop
32
We reserve the right to make changes without any prior notice.
UATYA
4P645203-1
5.8.1 Damper control
The controller can control the dampers in two different ways: “standard” and “adaptive”.
When dampers are required to stay in a fixed position, for instance to provide for the correct flow of fresh air, system
conditions may exist in which the damper signal cannot guarantee the desired air percentage.
5.8.1.1 Standard control
Standard control requires that the dampers stay in their position irrespective of the actual fresh air percentage.
5.8.1.2 Adaptive control
Adaptive control corrects damper opening based on the necessary fresh air percentage. This control requires that
the mixed air probe is fitted.
The controller uses the values of the air temperature in the return line, the external air temperature and the
corresponding damper opening percentage to calculate the theoretical value of mixed air.
The controller compares the calculated mixed air value with the value actually measured and then uses a PID to
correct the damper signal until the difference is cancelled.
5.8.2 Damper management
The controller can manage damper control either linearly or proportionally.
Linear control enables opening of the damper with a tilt angle that is equal to the required opening percentage.
Proportional control is designed to open the dampers so that the air can flow, i.e. at the required percentage of the
max. possible opening.
All units featuring dampers are set by default to run a proportional control.
5.8.3 Unit start-up
When the unit is started up, specific damper adjustments may be required for some management functions.
If no washing or recycling cycle is to be run at unit start-up, the controller opens the dampers at the percentage value
set for air changing, irrespective of their number.
5.8.4 Washing
Washing means changing the air in the room and it consists in exhausting all the air in the return line and only letting
external air flow into the room.
If washing is required at unit start-up, parameter “DA52” must be set to “1”.
While the washing cycle is in progress, the controller keeps the exhaust air and external air dampers open at their
max. opening percentage and it keeps the recycled air damper in closed position for the time setpoint in parameter
“DA54”.
If the value in parameter “DA53” is set to “0”, the washing cycle takes place without any thermoregulation of the air.
If the value in parameter “DA53” is set to “1”, thermoregulation is active.
If the washing cycle is run with thermoregulation active, the position of the dampers may be affected by conditions
resulting from compressor operation.
While the washing cycle is in progress, a button flashes on the main screen: it is pressed to stop the cycle manually
before the time set in parameter “DA54” elapses.