Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
8-27
Room sensor off, operation enabled
If these settings are active, the room sensor only has a display character and does
not influence the functions. Operation of the room device is possible.
Application: All plant types that do not allow for room influence but (in contrast to the
setting
OFF ) display of the current room temperature is desired.
8.2.2.2 Room factor heating circuit
Function: This function determines to what extent a deviation of the room temperature from the
setpoint affects the control of boiler flow temperature.
If there is no difference between the desired (NOM) and the current (ACT) room
temperature, the direct heating circuit’s flow temperature is controlled according to
the set heating characteristic.
If there is a difference between the room temperature and the setpoint, the heating
characteristic is shifted parallel to the room temperature axis so that the deviation is
compensated. The amount of the displacement depends on the setting of the room
factor.
The following relation applies:
Corrected room setpoint =
adjusted room setpoint – (Deviation x Room Factor)
100
Example: Adjusted room setpoint = 21°C
Current room temperature = 20°C
Deviation = -1K
For a room influence of 100%:
Corrected room setpoint = 21°C -( -1K · 100 ) = 22°C.
100
The boiler temperature is controlled according to a heating characteristic which
corresponds to a room temperature setpoint of 22 °C.
High settings lead to a quicker adjustment of the control deviation, while they reduce
the stability of the control circuit and can lead with excessively high setpoints to the
oscillating of the control value (= room temperature).
Operation:
Para-
meter Designation Factory
preset Setting range / Setting values
03 Room influence (with
room unit ) OFF OFF Display of H-GEN temperature, room
sensor off, operation enabled
1 Display room temp., room sensor active,
operation active
2 Display room temp., room sensor active,
operation blocked
3 Display room temp., room sensor off,
operation active