Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 5 General functions, fundamentals 2017-09-29
5.6 Heat demand and load control
5.6.1 Heat demand
Heat consumers, such as heating circuits and DHW heating, send their heat demand
signals to the heat distribution zone "Heat generation".
A demand transformer converts such signals to appropriate heat demand signals (for
details, refer to section 7.3 "Heat demand transformer".
Heat source or primary controller receive the heat demand signals and evaluate them.
Usually, evaluation is a maximum value generation of the temperatures obtained from
the heat demand signals.
A heat source (example 1) delivers the heat demanded by the consumers. A primary
controller (example 2) also provides this heat but, in addition, sends a heat demand
signal to a heat source.
T
T
3131B15
T
Heat
consumer
Heat
source
Heat
consumer
Heat demand
Load control
T
T
3131B17
T
T
T
T
Heat
source
Heat
consumer
Heat
consumer
Heat
consumer
Heat
consumer
Heat consumer /
primary controller
The heat demand signals can be assigned a priority.
If DHW heating is operated with absolute priority, its heat demand signal must be given
priority. This temperature request will therefore be the decisive variable.
For DHW heating, it can also be parameterized whether, during DHW heating, the heat
demand shall be evaluated as a maximum value or in the normal way.
Examples
Example 1: Heat source
and heat consumer
Example 2: Heat source,
primary controller and heat
consumer