8.11 Control mode
The selected control mode (section 8.11.1 to 8.11.3) of the return flow boost affects the control
mode of the modulation and vice versa. The following connection applies:
4
Return flow boost in continuous control
<–>
Modulation in three-point
4
Return flow boost in on/off or three-point control <–>
Modulation in continuous
On using modulating burners (systems Anl 6 and 7), the default setting of the control signal for
the return flow boost is configured to be continuous (Co1, 2 -> Fb05 = ON) and the modulation
control uses a three-point signal. With Co1, 2 -> Fb05 = OFF, this assignment is reversed,
meaning that the modulating burners can also be controlled with a continuous signal.
Setting for return flow boost: continuous control; Modulation: three-step control
Functions
WE
Configuration
RüL-RK1, 2
6
120 s
0 s
Co1, Co2* -> Fb05 = ON
K
P
(proportional gain) / 0.1 to 99.9
T
N
(reset time) / 0 to 999 s
T
V
(derivative-action time) / 0 to 999 s
Setting for return flow boost: three-step control; Modulation: continuous control
Functions
WE
Configuration
RüL-RK1, 2
6
120 s
0 s
120 s
Co1, Co2* -> Fb05 = OFF
K
P
(proportional gain) / 0.1 to 99.9
T
N
(reset time) / 0 to 999 s
T
V
(derivative-action time) / 0 to 999 s
T
Y
(valve transit time) / 5 to 240 s
3-step pulsing/on-off signal RüL-RK1, 2
OFF
Co1, Co2* -> Fb06 = ON
Setting for return flow boost: on/off control; Modulation: continuous control
Functions
WE
Configuration
RüL-RK1, 2
6
120 s
0 s
120 s
Co1, Co2* -> Fb05 = OFF
K
P
(proportional gain) / 0.1 to 99.9
T
N
(reset time) / 0 to 999 s
T
V
(derivative-action time) / 0 to 999 s
T
Y
(valve transit time) / 5 to 240 s
3-step pulsing/on-off signal RüL-RK1, 2
OFF
5 °C
120 s
120 s
Co1, Co2* -> Fb06 = OFF
Hysteresis / 1 to 30 °C
Min. activation time / 0 to 600 s
Min. deactivation time / 0 to 600 s
EB 5474 EN
57
System-wide functions
