Theben KNX Series Handbook page 49

4.6.7 Cooling control
Designation
Type of control
Number of cooling stages
Hysteresis of 2-point controller
Recirculation of hysteresis after
switching point
Setting the control parameters
Installation type
Proportional band of the cooling
control
RAMSES 718 P / RAMSES 718 S
The application programmes RAMSES 718 P/S
Values
Continuous
2-point
Only one cooling stage
Main stage and
additional stage
0.3 K, 0.5 K, 0.7 K
1 K, 1.5 K
None
0.1 K/min
0.2 K/min
0.3 K/min
Via installation type
User-defined
Cooling surface
Fan coil unit
1 K, 1.5 K, 2 K, 2.5 K
3 K, 3.5 K, 4 K, 4.5 K
5 K, 5.5 K, 6 K, 6.5 K
7 K, 7.5 K, 8 K, 8.5 K
Description
Infinite control
(0.. 100%).
Switching control (On/Off).
See in the Appendix: Continuous
and switching control.
Choice of 1- or 2-stage cooling
Interval between the tripping
point (set point) and the turn
back on point (set point –
hysteresis).
The hysteresis prevents a
permanent switching on/off.
The recirculation causes a
gradual decrease in the
hysteresis over time, and the
control accuracy is increased.
The hysteresis is equivalent to
the programmed value for each
switch-off and is gradually
reduced by the recirculation
process. The hysteresis can
reduce to 0 K over prolonged
periods of switch-off.
When switching on the next time,
it will be reset to the configured
value.
Standard application.
The control parameters are
preset.
Professional use: Configure P/PI
controller yourself.
PI controller with:
Integrated time = 240 minutes
Bandwidth = 5 K
Integrated time = 180 min.
Bandwidth = 4 K
Professional setting for adapting
control response to the room.
Small values cause large changes
in actuating values, larger values
cause a finer actuating value
adjustment.
See in the Appendix:
Temperature control
49