Fan Coil Actuator FCA 2
Updated: Feb-16 (subject to changes) Page
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6.8.3 Time between heating and cooling and overrun phase
When switching between heating and cooling, the heating valve is first closed; the
Overrun time
for utilisation of remaining energy
starts simultaneously (if configured).
After the heating valve is closed, the configured
Time between heating and cooling
runs.
The overrun phase can continue during this time. The cooling valve can be opened at the end of
the overrun phase.
In this case, the overrun phase will be interrupted if it has not already ended.
If the cooling valve does not have to be opened because the room temperature is in the dead zone,
the overrun phase may continue.
The same procedure applies when switching between cooling and heating.
As soon as the heating valve is opened, the
warm start
phase starts if desired.
Overrun time for utilisation of remaining energy:
Actuating
value
Heating
= 0 %
Overrun time for utilisation of remaining energy
Close heating valve
Time betw. heating and cooling
Figure 17
Transition between heating and cooling
.
Heating
actuating
value
= 0 % and
receive
Cooling
actuating
value
> 0 %
Maximum overrun time for utilisation of remaining energy
Close heating valve
Time between heating and cooling
Open cooling valve
Figure 18
Transition between cooling and heating.
Cooling
actuating
value
= 0 % and
receive
Heating
actuating
value
> 0 %
Maximum overrun time for utilisation of remaining energy
Warm start phase
Close cooling valve
Time between heating and cooling
Open heating valve
Figure 19
