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

Function description
Mechanical ventilation with Vitovent 200-C/300-F
A buffer cylinder with a large volume should be inte-
grated in the heating system if the following conditions
apply. In this case the heating water buffer cylinder
integrated in the Vitovent 300-F will not be required.
■ There are other heating circuits in addition to the
ventilation heating circuit A1/HC1.
The heating output of the heat pump is greater than
■
the max. output of the reheating coil.
The set flow temperature of the heating circuit in
weather-compensated mode is derived from the set
room temperature ("Standard room temperature
2000" / "Reduced room temperature 2001") and the
adjusted outside temperature according to the set
heating curve: See chapter "Heating/cooling circuits".
As the flow temperature must be above the supply air
temperature for heat transfer, the set flow temperature
determined from the heating curve is increased by 5 K.

Protection against excessively high temperatures

If the outdoor air temperature exceeds 50 °C (e.g.
when there is a fault in the preheating coil), the fan
speed increases. This dissipates excess heat. From
80 °C, the max. fan speed is set.
Vitovent 300-F: Humidity and/or CO
A CO /humidity sensor (accessories) is required for
2
regulating air humidity and/or CO
sensor is mounted in a single room.
The air flow rate is adjusted subject to the air humidity
and/or the CO concentration of this room.
2
If the humidity in this room exceeds "Humidity value
for raising the flow rate 7D19" and/or the CO
centration "CO2 value for raising the flow rate
7D18", the air flow rate is increased. The air flow rate
is reduced when these values are undershot.
Enabling required
Function
Humidity control
CO concentration control
2
64
Note
■
■
Required settings
Parameter
"Enable reheater bank
hydraulic 7D02"
"System scheme 7000"
Parameters for additional
system components
concentration control
2
Note
The higher air flow rate is always selected if both func-
concentration. This
2
tions are active (see table below).
■
■
con-
2
Parameter
"Enable humidity sensor 7D05"
"Enable CO2 sensor 7D06"
(cont.)
Room temperature-dependent control ("Room tem-
perature control 2005" set to "1") can not be selec-
ted in conjunction with supply air heating.
To avoid stirring up dust and therefore creating an
odour nuisance when providing supply air heating
with Vitovent 300-F, the supply air temperature must
not exceed 52 °C. For this, limit the set flow tempera-
ture of all heating circuits to max. 57 °C ("Max. flow
temperature heating circuit 200E, 300E").
The control limits are the air flow rates of the
"Reduced" and "Intensive" operating statuses.
For these functions, the "Standard" operating status
must be active in the time program.
Setting
"1"
"1", "2", "5", "6"
See relevant chapter.
Setting
"1"
"1"