VTS Ventus VVS300 [24/47] Humidity regulation
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VTS Ventus VVS300 [24/47] Humidity regulation

VTS Ventus VVS021 [24/47] Humidity regulation
uPC3 – rel 1.8 – 11/2021
24
of a settable delta), the bypass damper opens and
the heat exchanger is bypassed.
In the following picture we represent the
‘’freecooling’’ enabling, that in case of unit without
the mixing damper is the by-pass damper
activation condition, considering as example the
room temperature as regulation variable.
The freecooling is enabled if the external
temperature is higher than the lower supply
temperature threshold, while the freeheating is
enabled if the external temperature is lower than
the upper supply temperature threshold.
The bypass damper can be modulated to reach the
desired temperature for the supply air temperature,
because the freecooling can be considered as the
first step of sequential PID regulation.
In case of unit with the mixing damper, the
freecooling/freeheating conditions are the same,
but mixing damper and external one modulate
accordingly, and the logic acts on the bypass
damper as in the previous case.
Night kick
If the unit is in standby mode, the unit start at a
certain hour in the night to check the conditions and
if there is requests, the unit switch ON. When
conditions are reached, the unit goes back to
standby.
6.6 Humidity regulation
The regulation of the unit could be done according
to return, supply or room set.
The regulation of humidity in this SW is done by
absolute humidity.
Absolute humidity set is the conversion between
the actual temperature setpoint (room, return or
supply) and the humidity set that the user can
change.
Absolute humidity is the conversion between the
actual temperature and the humidity of room, return
or supply.
Based of these convertions it’s possible to
determine if the unit should go in humidifying or
dehumidifying mode. When the humidity goes to
change mode, a delay of 5 minutes is provided to
avoid fast change of humidity control.
In case of regulation on return or room temperature, the
application check the supply humidity limits to avoid water of the
ducts. Closer the supply humidity is to the limits, lower the
humidity PID can act.
In case of regulation on supply, the humidity request goes
directly to the devices.
In case of dehumidifying:
- The signal to control the cooling devices is calculate from
the maximum between output temperature PID and the
output humidity PID.
- The main heating devices are disabled and the reheaters
works to compensate the cooling effect.
6.7 Devices activation
Hydronic circuits
Below the description of how the water circuits
works in the application. Valves could be present
according application code in main cool, main heat,
reverse, preheat and reheat sides.
The PID sequence calculate a request 0-100% that
could be directly executed by the valves or in some
cases, the request is used to calculate the setpoint
for the water, in case the water temperature is
present.
Here below the regulation of hot water devices:
Heaters
Below the description of how the heaters works in
the application. Heaters could be present
according application code in main, preheat and
reheat sides.
The PID sequence calculate a request 0-100% that
is directly executed by the heaters.
Maximum heaters managed are 2 ON-OFF and 1
modulating.
The SW need the power of each heater to divide
the power in the best way.
The modulating device has the highest priority and
there isn’t any rotation, but in case of devices with
different power, the priority of ON-OFF devices can
Set
Room – Ext Temp.
Delta
Set
Dehum.
Hum.
Delay 5min.
0%
100%
Min
Valve
Pump

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