ABB i-bus KNX Product Manual page 28

5 A ppendix
4 B
5.1 F an override mode
1 5 B
This function permits the manual pre-selection of the fan level, both via the button on
the device and via the bus.
It can be time-activated on the Operation parameter page or activated or blocked
permanently.
Button operation
Button Function
press
1 Fan off
2 Fan level 1
3 Fan level 2
4 Fan level 3
5 Auto
Important: Depending on the actuator used, either a 1 or a 0 is required to
trigger override operation.
This behaviour is adjustable, see parameter Switch fan between auto and override
on parameter page Operation.
Send behaviour with override using fan coil actuator (override = 1):
Object 17 sends a 1 to the fan coil actuator, triggering override operation.
Object 16 sends the control value for the fan level selected in accordance with the
threshold value set.
Important: The override control value sent should always be slightly higher than the
threshold setting in the fan coil actuator.
Example:
For actuating the ABB i-bus fan coil actuator LF/A 1.1
Threshold Set values with
value for fan RTF/A 1.1
level
1
2
3
LED
OFF
1
2
3
Auto
Send value 1
Send value 2
Send value 3
LFA/S adjusts the
level automatically
1
2
3
28