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fluctuations. The limiting function of the supply air tries to limit the battery power to comply with the
specified minimum and maximum values.
A dead zone can be defined between the setpoints for heating and cooling, by which a deactivation
of the heating batteries and cooling batteries can be achieved (energy saving). They are deac-
tivated as long as the return air temperature is in the dead zone. The adjustment of setpoints is per-
formed separately for economy and comfort mode.
This control strategy is mainly used for stage controlled cooling / heating, e.g. in a cooling by means
of a direct evaporator (compressor) and is better suited than the cascade or supply air temperature
control, because the air temperature is subjected to greater fluctuations by the compressor and no
constant supply air temperature is possible.
Setpoint
Heat Eco
Heat Comfort
Cool Eco
Cool Comfort
Table 13: Setpoints for return air temperature control
Room cascade (RoomCasc)
This control strategy works the same as the return air cascade, only that the room temperature of a
room unit or room sensor is used as control variable. The adjustable offset at the room unit affects
the heating / cooling setpoints.
This control strategy is only available if a room unit or a room sensor is present and is used when
the return air temperature is heavily distorted and is an inappropriate control variable or the room
temperature should be used directly. The setpoint settings match the settings of the return air cas-
cade (14.2.1.1).
If a room unit and a room sensor are installed, then the room sensor is used and the sensor of the
room unit has no function.
Room
This control strategy works the same as the return air control, only that the room temperature of a
room unit or room sensor is used as control variable. The adjustable offset at the room unit affects
the heating / cooling setpoints.
This control strategy is only available if a room unit is present and is used when the return air tem-
perature is heavily distorted and is an inappropriate control variable or the room temperature should
be used directly. The setpoint settings match the settings of the return air (14.2.1.3).
If a room unit and a room sensor are installed, then the room sensor is used and the sensor of the
room unit has no function.
14.2.2
AHU with 3 batteries (saturation temperature)
If the device has a preheating battery, a cooling battery and a postheating battery, then a saturation
temperature sensor can be mounted after the cooling battery. By this sensor, the first two batteries
70/115
Description
Heating setpoint for economy mode
Heating setpoint for comfort mode
Cooling setpoint for economy mode
Cooling setpoint for comfort mode
Default
18 °C
20 °C
24 °C
22 °C
V07-19.0
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