52
Vitovent 300-C
To enable the balancing of flow rate differences
between the supply and extract air sides, "Imbalance
permitted C1A2" must be set to "1".
The supply air flow rate can be set to increase or
decrease compared to the extract air flow with "Speci-
fied imbalance C1A3".
Danger
If "Imbalance permitted C1A2" is set to "1",
only the supply air flow rate can be reduced to
enable frost protection for the heat exchanger,
e.g. if the output of the preheating coil is insuffi-
cient. This may create negative pressure in the
rooms. When operating open flue combustion
equipment, dangerous flue gases could then
flow back into the room.
When operating open flue combustion equip-
ment without on-site safety equipment, do not
set "Imbalance permitted C1A2" to "1".
Vitovent 300-W
■
With the Vitovent 300-W, the supply air and extract
air flow rates are automatically balanced by the ven-
tilation unit. Manual balancing is not required.
■
Parameters "Imbalance permitted C1A2" and
"Specified imbalance C1A3" are not displayed.
Passive cooling
With passive cooling, the ventilation unit uses the out-
door air for central cooling.
Note
Subject to the temperature conditions, only low cooling
capacities are available during passive cooling.
With passive cooling, the outdoor air is not routed via
the heat exchanger, but instead via the bypass directly
into the rooms. The bypass opens and closes automat-
ically, depending on the following conditions:
Enabling required
Parameter Setting
"Bypass operation
C1A0"
"0"
Conditions for passive cooling
Passive cooling ON Passive cooling OFF
All of the following conditions must be met:
■
Outdoor air temperature (heat exchanger air inlet) >
7 °C
■
Extract air temperature > "Set extract air tempera-
ture C108" plus 2 K
■
Extract air temperature > outdoor air temperature
One of the following conditions must be met:
■
Outdoor air temperature (heat exchanger air intake) is
≤ 6.5 °C
■
Extract air temperature ≤ "Set extract air tempera-
ture C108" minus 0.5 K
■
Extract air temperature ≤ outdoor air temperature mi-
nus 0.5 K
Vitovent 300-C: Cooling via geothermal heat exchanger
The outdoor air can be routed through a geothermal
heat exchanger (on site), regardless of the position of
the bypass damper integrated into the ventilation unit.
This causes the outdoor air to cool down in the ground
during the warmer months.
If the outdoor air exceeds "Max. temperature, geoth.
heat exchanger C1AB", the 3-way diverter damper
(on site) opens up the path through the geothermal
heat exchanger. Below this temperature the outdoor air
flows directly into the ventilation unit uncooled.
Function description
Mechanical ventilation with Vitovent 300-C/300-W (cont.)
5816558
Functions
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