Basic Documentation

259/332
Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Refrigeration demand 03.10.2011
26 Refrigeration demand
The refrigeration demand function collects refrigeration requests. These
refrigeration requests occur internally or come from consumers of a refrigeration
distribution zone via the bus. The collected refrigeration demand can be sent to a
an other zone (basic type C only) or further handled as a resulting setpoint
condition (temperature request signal, chilled water flow temperature setpoint) in
the form of a continuous or digital signal.
26.1 Activate block (basic types A, P, U)
x
Kältebedarf
QY
d
S4 S4 S4
S5
123
Cooling demand
Supervision
Controller
To activate the "refrigeration demand" function, the sequence must be assigned to
the function where the cooling coil or cooling surfaces are configured. A sequence
can be assigned to each controller.
Main menu > Commissioning > Extra configuration > Aggregates > Refrigeration demand >
Operating line Adjustable values / remarks
Controller 1 ---, Sequence 4, Sequence 5
Controller 2 ---, Sequence 4
Controller 3 ---, Sequence 4
Refrigeration demand can be transmitted via communication when communication
is activated (see section 28 "Communication"). The refrigeration distribution zone
must be
set to generate a refrigeration demand signal that is processed by another
device on KNX.
Main menu > Commissioning > Communication > Distribution zones >
Operating line Range Factory setting
Refrigeration
distribution zone
1…31 1
Refrigeration demand is sent as a load signal (0...100% load) via communication.
At the same time, the primary controller receives information whether or not
refrigeration is called for. This means that the primary controller is switched on and
off depending on demand.
Configuration
Load signal