Protection Against Excessively High Temperatures - Viessmann VITOTRONIC 200 Service Instructions Manual

Function description
Mechanical ventilation with Vitovent...
If the outdoor air falls below "Min. temperature, geo-
thermal 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.

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 ("Imbalance permitted
C1A2").
Humidity and/or CO
2
The following sensors are required for regulating the
air humidity and/or CO concentration in the building:
2
■ CO /humidity sensor: Installation in a single room
2
The air flow rate is adjusted subject to the air humid-
ity and/or the CO concentration of this room.
2
Central humidity sensor: Installation in the central
■
extract air duct (header)
The air flow rate is adjusted subject to the air humid-
ity in all the rooms.
Air humidity/CO control in a room
2
If the humidity in the room exceeds "Min. voltage,
input 2 C1C1" and/or the CO
"Min. voltage, input 1 C1B1" the air flow rate is
increased. The air flow rate is reduced when these val-
ues are undershot.
Enabling required
Function
Enable for processing of analogue signals at
the ventilation unit intake
CO concentration control
2
Humidity control
Central air humidity control
If the air humidity in the central extract air duct
(header) increases, "Intensive operation" is switched
on. The original ventilation level is reapplied once the
air humidity has been reduced. The response charac-
teristics of this humidity control are set via "Humidity
sensor sensitivity C1A6".
Enabling required
Function
Central humidity sensor
Sensitivity
68
concentration control
concentration exceeds
2
Parameter
"Function, input 1 C1B0"
"Min. voltage, input 1 C1B1"
"Min. voltage, input 2 C1C1"
Parameter
"Humidity sensor C105"
"Humidity sensor sensitivity C1A6"
(cont.)
Required enable, 3-way diverter damper (on site)
Parameter
"Preheating coil C101"
Note
■ The higher air flow rate is always selected if both
functions are active at the same time.
■ If air humidity control via a central humidity sensor is
simultaneously active: Control via the central humid-
ity sensor has priority.
Setting
"65" or "81"
Setting
"1"
≙
"40" ( 4 V)
≙
"80" ( 8 V)
Setting
"1"
"0"
≠