Glossary
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Glossary
Flow and return flow temperature
The flow temperature is the temperature to which the heat
source heats the water that transfers the heat to the con-
sumer (e.g. radiator). The return flow temperature is the
temperature of the water that flow back from the consumer
to the heat source.
Desired and actual temperature
The desired temperature (or setpoint temperature) de-
scribes the desired temperature for a room or for hot wa-
ter.
The actual temperature denotes the actual temperature
that prevails. The heating controller has the task to adjust
the actual temperature to the desired temperature.
Reduced temperature
The setback temperature is the desired temperature to
which the heating system heats outside heating times (e.g.
at night). It should be set so that the rooms do not cool
down too much while saving energy.
Heat source
Heat source is generally the designation for the heating
boiler. It may also be a buffer storage tank however.
Circulation pump
The circulation pump ensures that there is constant hot
domestic water available. The hot water is held in the stor-
age tank. The circulation pump circulates it via the fresh
water pipes in accordance with the heating program.
Return flow booster
The return flow booster prevents the temperature differ-
ence at the heat source between flow an return becoming
too great. A mixing valve is here used to add a portion of
the hot flow water to the return flow. This prevents heating
gas steam from condensating against the cold heat carrier
inside the heating boiler. The minimum temperature re-
quired for this process inside the heating boiler depends
on the type of fuel (oil 47 °C, gas 55 °C). The risk of corro-
sion inside the heating boiler is thereby reduced signifi-
cantly.
Direct heating circuit
In the direct heating circuit the flow temperature is identical
to the heat source temperature, i.e. the direct heating cir-
cuit is operated with the maximum temperature.
Mixed heating circuit / Mixer circuit
In the mixed heating circuit a three-way valve is used to
add cooled water from the return flow to the hot flow water.
The flow temperature is thus reduced. This is important for
Underfloor heating systems, for example, because they
must only be operated with low flow temperatures.
Heating time
In the heating programs you can define up to three heating
times per day, one for the morning, one for lunchtime, and
one for the evening for example. During a heating time, the
temperature is controlled to the desired room temperature.
Between heating times the temperature is controlled to the
setback temperature.
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