54
Frost protection with additional electric preheating coil
The additional electric preheating coil (accessories) is
installed in the outdoor air duct.
If the output of the factory-fitted preheating coil is not
sufficient to reach the relevant outdoor air temperature
(0 °C, 4 °C), the additional electric preheating coil is
switched on. The air flow rate is only reduced if the
combined heating output of both preheating coils is
insufficient.
Enabling required
Parameter Setting
"Preheating coil C101" "17" or "81"
End of frost protection function
See chapter "Frost protection with factory-fitted electric
preheating coil".
Vitovent 300-C: Frost protection with geothermal heat exchanger
For preheating, the outdoor air can be routed through
a geothermal heat exchanger (on site).
If the outdoor air falls below "Min. temperature,
geoth. heat exchanger C1AA", the 3-way diverter
damper (on site) opens up the path through the geo-
thermal heat exchanger. Above this temperature the
outdoor air flows directly into the ventilation unit with-
out preheating.
Enabling required, 3-way diverter damper (on site)
Parameter Setting
"Preheating coil C101" "65" or "81"
Protection against excessively high temperatures
If the outdoor air temperature rises above 60 °C, the
ventilation controller switches off either both fans or
only the supply air fan (adjustable on the
Vitovent 300-C with "Imbalance permitted C1A2").
Humidity and/or CO
2
concentration control
The following sensors are required for regulating the
humidity and/or CO
2
concentration in the building:
■
CO
2
/humidity sensor for Vitovent 300-C: Installation
in one room
The air flow rate is adjusted subject to the humidity
and/or the CO
2
concentration of this room.
■
Up to 4 CO
2
sensors for Vitovent 300-W: Installation
in different rooms
The air flow rate is adjusted subject to the highest
CO
2
concentration measured in the relevant
rooms.
■
Central humidity sensor for Vitovent 300-C/300-W:
Installation in the central extract air duct (header)
The air flow rate is adjusted subject to the humidity in
all the rooms.
Requirement for control of humidity and/or CO
2
con-
centration:
Operating status "Reduced" or "Standard" is active.
Operating instructions "Ventilation programming
unit, type LB1"
Vitovent 300-C: Humidity/CO
2
control in the room
If the humidity in the room exceeds "Min. voltage,
input 2 C1C1" and/or the CO
2
concentration exceeds
"Min. voltage, input 1 C1B1", the air flow rate is
increased. The air flow rate is reduced when these val-
ues are undershot.
Note
■
The higher air flow rate is always selected if both
functions are active at the same time.
■
If humidity control via a central humidity sensor is
simultaneously active: Control via the central humid-
ity sensor has priority.
Function description
Mechanical ventilation with Vitovent 300-C/300-W (cont.)
5816558
Functions
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