7.7On/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.
Function | WE | Configuration |
On/off control for RK1/RK2 | ON | FB10/FB17 = OFF |
| 5 °C | Hysteresis / 1 to 30 °C |
7.8Releasing 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 were in frost protection mode if the outdoor temperature requires 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 |
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Note!
The function cannot be selected in systems Anl 4, 5 and 9 with solar system and in system Anl 11 with VF3.
7.9Processing 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 | FB25 = ON, bed |
| 20 °C | Minimum flow temperature for external demand / 20 to 130 °C |
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60EB 5476 EN
