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7.7 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 pointby T = 0.5 x
Hysteresis
, the control valve isclosed. The greater the
Hysteresis
selected, the lower the switching frequency.
Function
WE Configuration
On/off control for RK1/RK2 ON
5 °C
FB10/FB17 = OFF
Hysteresis / 1 to 30 °C
7.8 Releasing a control circuit over the binary input
The release of a control circuit using the binary output only becomes effective when the respec
-
tive control circuit is in automatic mode (icon ).
The released control circuits always work in automatic mode; the deactivated control circuit be-
haves as if it werein frost protection mode if the outdoor temperaturerequires it. The control cir-
cuit can be released via the binary input when the binary input is open (BE = ON).
Function
WE Configuration
Releasing a control circuit OFF FB25 = ON, FErn
Note!
The function cannot be selected in systems Anl 4, 5 and 9 with solar system and in system
Anl 11 with VF3.
7.9 Processing of external demand in RK1
Regardless of the operating mode, except form manual mode, of the control circuit RK1, the
controller uses the
Minimum flow temperature for external demand
when the binary input is
closed (BE1 = ON). The DHW heating from the secondary circuit and demands of the heating
circuit which are higher than the
Minimum flow temperature for external demand
have priority.
In systems Anl 7 and 8, a mixing control is not active, just the set point of the heating circuit
changes.
The deactivated binary input (BE1 = OFF) does not have any effect on the control.
Function
WE Configuration
External demand over BE1 OFF
20 °C
FB25 = ON, bed
Minimum flow temperature for external demand / 20 to 130 °C
60 EB 5476 EN
System-wide functions