30
Balancing of flow rate differences
Due to the conditions in the building, an unwanted dif-
ferential may occur between the supply air and extract
air flow, e.g. through different lengths of ductwork for
outdoor/supply air and extract/exhaust air.
To balance out any imbalance, the supply air flow rate
can be increased or decreased compared to the
extract air flow. This is specified on the ventilation unit
using "Specified imbalance C1A3": Set "Imbalance
permitted C1A2" to "1"
Air flow rate for frost protection
If the output of both the factory-fitted and/or the addi-
tional electric preheating coils (accessories, installation
in outdoor air duct) is not sufficient, the air flow rate is
reduced to protect the heat exchanger. Depending on
the setting, both air flow rates or only the supply air
flow rate are reduced.
Protection against excessively high temperatures
If the outdoor air temperature rises above 60 °C, the
ventilation controller either switches off both fans or
only the supply air fan.
Value Meaning
"0"
■
Supply air and extract air flow rates are re-
duced for frost protection.
■
Both fans are switched off to protect against
excessively high temperatures.
■
No increase or decrease of the supply air
stream in comparison to the extract air
stream: Supply air and extract air flow rate
in the ventilation unit are always the same.
"1"
■
Only the supply air flow rate is reduced for
frost protection.
■
Only the supply air fan is switched off to
protect against excessively high tempera-
tures.
■
The supply air flow rate can be increased or
decreased compared to the extract air flow
rate using "Specified imbalance C1A3".
Danger
Frost protection switches off the supply air fan
which may create negative pressure in the
room. 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
adjust setting "1".
C1A3 Specified imbalance !
Vitovent
200-C 300-C 300-W
— X —
Due to the conditions in the building, an unwanted flow
rate differential (imbalance) may occur between the
supply air and extract air side, e.g. through different
lengths of ductwork for outdoor/supply air and extract/
exhaust air.
To even out any imbalance, the supply air flow rate can
be increased or decreased compared to the extract air
flow. This is specified on the ventilation unit using
"Specified imbalance C1A3".
Requirement: "Imbalance permitted C1A2" is set to
"1".
Value Meaning
"–100"
to "–1"
For positive pressure in the building: Supply
air flow rate is decreased by the set value.
"0" Supply air flow rate and extract air flow rate
are equal.
"1" to
"100"
For negative pressure in the building: Supply
air flow rate is increased by the set value.
Setting in m
3
/h
C1A4 Set reheating coil temperature !
Vitovent
200-C 300-C 300-W
— X X
Do not adjust.
Parameter settings
C1A2 Imbalance permitted ! (cont.)
5816558
Parameter
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