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Return air cascade (RetCasc)
The return air temperature is used as a control variable. The supply air setpoints for the heating bat-
teries and cooling batteries are calculated by the deviation between the current return air tempera-
ture and the setpoints. The activation of the valves and the recovery is performed based on the de-
viation between the current supply air temperature and the calculated supply air setpoints. The cal-
culated supply air setpoints cannot exceed the minimum / maximum supply air limit.
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 combines the return air temperature control with a supply air temperature con-
trol. It is used when the return air temperature should be kept constant and can be used for infinitely
variable heating / cooling batteries (water batteries).
Setpoint
Heat Eco
Heat Comfort
Cool Eco
Cool Comfort
Table 11: Setpoints for cascade temperature control
Supply air
The supply air temperature is used as control variable. The recovery, heating and cooling batteries
are activated depending on the deviation between the current supply air temperature and the set-
points.
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 supply 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 in downstream heating or cooling units, which are not controlled
by the AHU.
Setpoint
Heat Eco
Heat Comfort
Cool Eco
Cool Comfort
Table 12: Setpoints for supply air temperature control
Return air
The return air temperature is used as control variable. The recovery, heating and cooling batteries
are activated depending on the deviation between the current return air temperature and the set-
points. This control is directly performed causing the supply air temperature is subjected to greater
V07-19.0
Description
Heating setpoint for economy mode
Heating setpoint for comfort mode
Cooling setpoint for economy mode
Cooling setpoint for comfort mode
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
Default
22 °C
24 °C
20 °C
18 °C
69/115
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