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10. Operating level 2
10.2.11 Temperature control
T - 01
DISPLAY
SELECTION
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Temperature control
Set value deviation
Offset, heating:
00.0 K
Offset, cooling
02.0 K
0 %
100 %
Heating
Temperature
Set value
Offset
cooling
Offset
heating
Cooling
Standard mask
Esc
Main menu
Heating contractor
Temperature control
Temperature control
Temperature control either utilises a supply air temperature control with a
fixed set value for the supply air or room temperature control as indoor /
(or extract air) supply air cascade. For the indoor / (or extract air) supply
air cascade, the set supply air temperature is determined by means of a
deviation from the set room temperature to the actual room or extract air
value. Minimum and maximum limits of the supply air are being maintained.
A dead zone exists between the heating and cooling sequence. ON offset,
heating and ON offset, cooling can be adjusted.
Weather-compensated enabling
In addition, the heating or cooling operation can be blocked subject to
outside temperature. For example, if the outside temperature exceeds the
total comprising the set room temperature and offset, heating (adjustable),
then heating mode will be stopped. That means, the heating circuit pump or
electric heater bank are switched off, the mixer closes and the heat source
demand stops.
Natural cooling (prerequisite: outside, room and extract air sensors
available)
This parameter in the standard settings enables natural cooling. Natural
cooling helps to save cooling energy by utilising the temperature differential
between the indoor air and the outdoor air. The outside temperature is
compared with the room/extract air temperature. If the outdoor air is cooler
than the indoor air by an adjustable value, then the fresh air proportion is
raised during cooling operation. Temperature control then affects the mixer
air damper. The cooling unit will only be started if more cooling energy is
required and the outdoor air damper is 100 % open.
Speed reduction
If the supply air temperature does not achieve the minimum supply air limit
within the set time or delay, in spite of 100 % heat demand, the fan speed
will be steadily reduced down to the set minimum speed. Any previously
selected imbalance between supply and extract air will be maintained (e.g.
through heat recovery ice guard).
Outside temperature via BMS
If a BMS is installed, the outside temperature is recorded and made
available.
The captured value of the outside temperature sensor is primarily used.
If the option "outside temperature BMS" is enabled, the value specified via
the BMS is adopted. There is no longer any need to connect an outside
temperature sensor. If a value outside the valid value range is sent, or if the
value sent does not change by at least 0.1 K within a day, an alarm message
is generated. As long as this alarm is active, the outside temperature is no
longer taken into account for control mode.
