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7.8 On/off control
The flow temperature can be controlled by an on/off signal. The controlled valve is opened
when the flow temperature falls below the set point by T = 0.5 x Hysteresis . When the flow tem-
perature exceeds the set point by T = 0.5 x Hysteresis , the control valve is closed. The greater the
Hysteresis selected, the lower the switching frequency. The UP lag time parameter indicates the
time span which the circulation pump continues to run after the control valve is closed (the pa-
rameter only needs to be set for the heating circuits HK1, HK2 and HK3).
By entering Minimum activation time, a burner once switched on remains switched on for the
time entered, regardless of how the temperature develops. Likewise, a burner that has been
switched off due to the temperatures remains switched off for the time entered in Minimum de-
activation time .
The on/off control can be configured separately for the individual heating circuits and for the
pre-control circuit.
Functions
Three-step control
for heating circuit
Three-step control
for pre-control circuit
7.9 Continuous-action control
The flow temperature can be controlled using a PID algorithm. The valve receives an analog 0 to
10 V signal issued by the controller. The proportional-action component causes an immediate
change in the 0 to 10 V signal when a system deviation arises (the larger the K
change). The integral-action component first affects the control after a certain time: T
for the time that passes until the I-action component has changed the output signal so far as the
P-action component just did (the larger the T
ponent causes every change in system deviation to have any increased effect on the output sig-
nal (the larger the T
The continuous-action control can be configured separately for individual heating circuits, for
the DHW heating and for the pre-control circuit.
WE
ON
5 °C
120 s
120 s
240 s
ON
5 °C
120 s
120 s
, the more intensified the change).
V
Configuration
Co1, 2, 3 -> Fb15 = OFF
Hysteresis / 1 to 30 °C
Minimum activation time / 0 to 600 s
Minimum deactivation time / 0 to 600 s
UP lag time / 120 to 1200 s
Co5 -> Fb14 = OFF
Hysteresis / 1 to 30 °C
Minimum activation time / 0 to 600 s
Minimum deactivation time / 0 to 600 s
, the slower the rate in change). The D-action com-
N
System-wide functions
, the greater the
P
stands
N
EB 5179 EN
63
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