7.10 Processing of external demand in RK1
The controller can process binary or analog requests for an externally required signal by a
more complex secondary system, provided the following requirements are met: the system is
configured without solar system and an analog request can be assigned to “0 to 10 V corre-
sponds with 0 to 120 °C flow temperature“. In other words: flow temperature demand
12 °C/V. Analog requests below 10 °C (< 0.8 V input signal) are not processed;
overvoltage generates a maximum flow set point of 130 °C. An additional processing of re-
quests for an externally required signal over the device bus cannot be configured.
Note!
Overheating may occur in the heating circuits of the primary controller without control valve.
Excessive charging temperatures in DHW circuits without control valve controlled by the pri-
mary controller are excluded when the default settings of the controller are used: while stor-
age tank charging is active, no flow temperature higher than the charging temperature is
used by the primary controller.
Nevertheless, if the
Priority for external demand
function is activated, the external demand
is also processed during storage tank charging.
Function
WE
Configuration
Priority for external demand
0
CO4 -> F16 - 1
Processing of external demand using a binary signal
Regardless of the operating mode set for control circuit RK1 – except manual mode –, the
flow temperature specified as
Set point for binary demand processing is used in control cir-
cuit RK1 when the binary input is either open (bE = 0) or closed (bE = 1).
Functions
WE
Configuration
Processing of external demand in RK1
0
CO1 -> F15 - 1
Processing of external demand, 0 to 10 V
0
CO1 -> F16 - 0
Processing of external demand, binary
0
1
CO1 -> F17 - 1
bE = 1, 0
Receive external demand
0
CO7 -> F15 - 0
Parameter
WE
Parameter level / Range of values
Set point for binary demand processing
40 °C
PA1 / 5 to 130 °C
76
EB 5576 EN
System-wide functions
