Instructions for the installer
25
4.6.3 OUTDOOR TEMPERATURE CONTROL ( OTC )
The heating curve generates the flow temperature setpoint,
which is used to maintain a certain flow temperature level
depending on the prevailing weather conditions. The heating
curve can be adjusted in different ways, thus matching the heat
output and the room temperature to individual needs. When the
heating curve slope is raised, the flow temperature increases
as the outside temperature drops. Or, in other words, if the
room temperature is not correct at low outside temperatures
but correct at higher outside temperatures, the heating curve
slope must be readjusted.
Increasing the slope:
Raises the flow temperature, especially
when the outside temperature is low.
Decreasing the slope:
Lowers the flow temperature, especially
when the outside temperature is low.
IMPORTANT INFORMATION
The set heating curve is based on a room temperature
setpoint of 20 °C. If this setpoint is changed, the
heating curve adapts automatically to the new value.
Heating curve – heating curve slope
Outdoor temperature
Fl
ow t
em
pe
ra
tu
re
Parallel displacement of the heating curve is used to change the
flow temperature evenly across the entire outside temperature
range or, in other words, if the room temperature is always too
high or too low, a readjustment must be made with parallel
displacement. Adaption of the heating curve is used by the
controller to automatically adapt the heating curve to the
prevailing weather conditions. In that case, a readjustment of
heating curve slope and parallel displacement is not required.
It can only be switched on or off.
IMPORTANT INFORMATION
To provide this function, following must be observed:
• A room sensor must be connected
• The Room influence setting must be selected between
1 and 99
• No thermostatic radiator valves should be used in the
reference room, where the room sensor is located (if
installed, such valves must be fully opened and locked
in that position)
The function is activated with parameter, provided a room sensor
is used and the compensation variant is weather compensation
with room influence. If the required flow temperature is exceeded
or is not reached for more than 2 hours, no adaption is made for
that day. With pump heating circuits, the boiler temperature is
used in place of the flow temperature. Heating curve adaption
readjusts the heating curve’s slope and the parallel displacement
(heat gains). In Comfort mode (nominal operating level), the
function integrates the room temperature control deviation and
readjusts at midnight the parameters for calculating the heating
curve, depending on the attenuated outside temperature and the
learning sensitivity. During boost heating, the deviation of room
temperature control is not taken into consideration. When
readjusting the heating curve or the heat gains, the
sensitivity is automatically set to the maximum. A certain
minimum sensitivity is always maintained. If the attenuated
outside temperature is below 4 °C, the heating curve slope is
readjusted through the learning process. If the attenuated
outside temperature lies between 4 °C and 12 °C, heating curve
slope and parallel displacement are readjusted through learning.
If the attenuated outside temperature exceeds 12 °C, the
learning process is stopped. These basic values apply to a
Comfort setpoint of 20 °C, heat gains of 0 K and a heating curve
displacement of 0 K.
