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RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation
theben
Version: Dec-10 (subject to change) Page 24 of 65
3.4.5 Cooling control
Table 14
Designation
Values
Application
Type of control
Continuous control
Infinite control
(0 .. 100%).
2-point control
Switching control (On/Off).
See appendix: Continuous and
switching control
Setting the control parameters
Via system type
Standard application
User-defined
Professional application: P/PI
controller set up
System type
PI control with:
Cooling surface
Integrated time = 90 minutes
Bandwidth = 2 k
Fan coil unit
Integrated time = 180 minutes
Bandwidth = 4 k
2-point control
Hysteresis of 2 wire control
for cooling.”
0.3 K, 0.5 K, 0.7 K
1 K, 1.5 K, 2 K
3 K, 4 K, 5 K
6 K
Interval between the switch-off
point (setpoint value) and the
switch back on point (setpoint
value hysteresis).
The hysteresis prevents constant
switching on/off.
hysteresis reduction to
switching point
None
0.1 K/min
0.2 K/min
0.3 K/min
The recirculation causes a
gradual decrease in 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.
At the next switch-on, it is reset
to the configured value.
24


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