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Valve outputs | Channel-independent functions
9.3.1.2 Objects for heat requirement
Object no.
10
1-bit output object for the transmission of general heat requirement information to
suitable burner and boiler controllers. A heat requirement is only signalled by the ac-
tuator when at least one command value of the assigned outputs exceeds a limiting
value with hysteresis defined in the ETS. A heat requirement signal is retracted
when the limiting value is reached or undershot again. In addition, the actuator can
optionally evaluate an external telegram (object 11).
The telegram polarity can be configured. After bus voltage return and an ETS pro-
gramming operation, the actuator always first transmits the status "No heat require-
ment" without a delay. The actuator then updates the status to "Heat requirement",
providing that the condition for this has been fulfilled and an optionally configured
"Heat requirement ACTIVE" has elapsed.
Object no.
11
1-bit input object for the cascading of multiple actuators with a heat requirement sig-
nal. The transmitting object of a heat requirement signal of another heating actuator
can be connected to this object. The local heating actuator links the external tele-
gram with the internal status of its own heat requirement logically as OR and outputs
the result of this link via the object 10.
In this case, the telegram polarity is fixed: "0" = Heat requirement INACTIVE, "1" =
Heat requirement ACTIVE.
Cyclical telegrams to this object with an identical telegram polarity (ON -> ON, OFF -
> OFF) produce no reaction. After a device reset, there is no polling of the current
status of this object. Only when a bus telegram is received does the actuator take
this status into account during evaluation of the heat requirement.
9.3.2 Pump control
The heating actuator allows switching activation of the circulation pump of the heat-
ing or cooling circuit via a 1-bit KNX telegram. When using the pump controller, the
pump is only switched on by the actuator via the "Pump control - Switch" object if at
least one command value of the assigned outputs exceeds a limiting value with hys-
teresis defined in the ETS. The pump is switched off when the limiting value is
reached or undershot again (see figure 6). This saves electrical energy, as the pump
is only activated by sufficiently large, and thus effective, command values.
Optional cyclical anti-sticking protection prevents the sticking of the pump, if it has
not been switched on by the command value evaluation for a longer period of time.
The telegram polarity of the pump control can be configured.
In addition, valve outputs, which receive preset command values via the data
format "Switching (1-bit)" and "Switching (1-byte) with command value limiting
value", influence the pump control. In the case of "Switching (1-bit)", an "OFF"
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Function
Heat requirement -
Status
Function
Heat requirement -
External
Name
General valve out-
puts - Output
Name
General valve out-
puts - Input
Type
DPT
Flag
1-bit
1,002
C, R, -, T, -
Type
DPT
Flag
1-bit
1,002
C, (R), W, -,
-
Page 44 of 257
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