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Siemens Building Technologies
HVAC Products
duces an instant parallel displacement of the heating curve. The correlation between
the amount of the deviation and the extent of the displacement is defined by the room
influence. The room temperature is dependent on the
• set room authority
• deviation of the actual room temperature from the setpoint
• set heating curve slope
These 3 factors are used to generate the correcting variable for the flow temperature
setpoint.
Main application of this type of control are well insulated buildings or buildings with
considerable heat gains where
• several rooms are occupied at the same time
• 1 of the rooms is suited as a reference room for the room temperature
12.6
Automatic ECO function
12.6.1 Fundamentals
The automatic ECO function is active with all plant types. It controls the heating system
depending on demand. This function gives consideration to the development of the
room temperature depending on the type of building construction and as a function of
the outside temperature. If the amount of heat stored in the house or building is suffi-
cient to maintain the room temperature setpoint currently required, the ECO function
will switch the heating off (valve fully closed, heating circuit pump off).
The automatic ECO function acts separately on both heating circuits.
Action of the automatic ECO function means:
• Heating circuit pump OFF; it can only be activated by frost protection for the plant
• Heating circuit mixing valve CLOSED
In the individual operating modes, the automatic ECO function behaves as follows:
Operating mode
Automatic operation
Continuous operation
Standby
manual operation
In the case of the RVD240, the automatic ECO function is subdivided into 2 part func-
tions. ECO function 1 is used primarily in the summer, ECO function 2 responds mainly to
short-term temperature changes and, therefore, is active during intermediate seasons.
When using the automatic ECO function, the heating system operates only, or con-
sumes energy only, if needed.
If required, the automatic ECO function can be deactivated.
12.6.2 Compensating variables and auxiliary variables
Also refer to subsection 12.6.2.
The automatic ECO function necessitates outside sensor. As a compensating and aux-
iliary variable, the ECO function takes into account the development of the outside
temperature. The following variables are taken into consideration:
• Type of building construction
• The actual outside temperature (T
• The attenuated outside temperature. Compared to the actual outside temperature,
the attenuated outside temperature is significantly damped. This ensures that no
heating will take place in the summer when, under normal circumstances, the heat-
ing would be switched on because the outside temperature drops for a few days
Basic documentation RVD240
12 Function block Space heating
Automatic ECO function is ...
active
inactive
active
inactive
)
A
CE1P2384en
27.05.2004
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