Passive Heating - Viessmann VITOTRONIC 200 Service Instructions Manual

Mechanical ventilation with Vitovent 200-C/300-F
Vitovent 300-F: In the "Standard" operating status,
the air flow rate can automatically be adjusted subject
to the following factors:
■ Humidity:
Measurement via CO /humidity sensor (accessories)
2
CO concentration:
■
2
Measurement via CO /humidity sensor (accessories)
2
Vitovent 200-C: External starting of Intensive oper-
ation
"Intensive operation" can be started with an external
switch or button (bathroom switch). This bathroom
switch is connected to the ventilation unit. To activate
the bathroom switch function, set "Function, external
230 V input, ventilation" to "1".
When the bathroom switch has been held down for 2
to 5 s, "Intensive operation" is switched on for
"Duration, bathroom vent. 7D3B".
Otherwise "Intensive operation" remains active for
as long as the bathroom switch is held down, up to a
max. of "Duration, bathroom vent. 7D3B".
Note
"Intensive operation" can be terminated at any time
at the heat pump control unit, using "Standby mode".
Heat recovery and humidity control
In standard ventilation mode the outdoor air and
extract air flow through the heat exchanger. All heat
exchangers used operate according to the countercur-
rent principle. This principle allows much of the thermal
energy of the extract air to be transferred to the cool
outdoor air, without the two air flows mixing together.
If an enthalpy heat exchanger is installed in the ventila-
tion unit, a part of the humidity is also transferred to
the supply air stream in addition to the thermal energy.
This contributes to a healthy ambience.
The type of heat exchanger is set as follows:
Heat exchanger
Countercurrent heat exchanger
Enthalpy heat exchanger
During heat recovery and humidity control the bypass
is not active.

Passive heating

With passive heating, the ventilation unit uses the out-
door air for central heating.
For this, the outdoor air is not routed via the heat
exchanger, but instead via the bypass directly into the
rooms.
The bypass is active in the following cases:
■
■
■
Balancing of the supply air and extract air flow
rates
Due to the conditions in the building, an unwanted flow
rate differential (disbalance) may occur between the
supply air and extract air side, e.g. through different
lengths of pipework for outdoor/supply air and extract/
exhaust air.
Note
To determine the flow rate differential, the captured
flow rates of all supply air apertures must be added
together and compared to the total flow rates of all
extract air apertures.
Flow rate differentials > 10 % must be balanced out as
follows:
Vitovent 200-C:
■
Vitovent 300-F:
■
"Type of heat ex-
changer 7D2E"
"0"
"1"
Note
■
■
(cont.)
Passive cooling is switched on: See chapter "Pas-
sive cooling".
Passive heating is switched on: See chapter "Pas-
sive heating".
Vitovent 200-C: The heat exchanger is defrosted
with a function that allows the cool outdoor air to be
routed past the heat exchanger by means of the
bypass: See chapter "Vitovent 200-C: Frost protec-
tion".
Ventilation unit installation and service instruc-
tions
To balance out the flow rate differentials, the control
voltages of the supply and/or exhaust air fan can be
permanently increased or reduced ("Control volt-
age matching, supply air fan 7D71" and "Control
voltage matching, exhaust air fan 7D72").
"Control voltage matching 7D27" permanently rai-
ses the air flow rate of one fan compared to the
other. "Fan for control voltage matching 7D28"
determines whether the air flow rate should be raised
for the supply air or the exhaust air fan.
Note
To avoid imbalances, the control voltage of the fan
that has not been selected is simultaneously limited
to 10 V minus "Control voltage matching 7D27".
This also reduces the maximum air flow rate.
Subject to the temperature conditions, only low heat-
ing outputs are available.
Vitovent 300-F: Ventilation level
bypass opens or closes.
Function description
is set while the
1
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