Passive Cooling - Viessmann VITOTRONIC 200 Service Instructions Manual

Function description
Mechanical ventilation with Vitovent 200-C/300-F
Conditions for passive heating
Passive heating ON
All of the following conditions must be met:
Outdoor air temperature (heat exchanger air intake)
■
extract air temperature plus 4 K
Extract air temperature
■
7D08" minus 1 K
Passive heating will not start if one of the following
conditions applies (bypass not active):
A sensor or fan fault has occurred.
■
■ Frost protection is active.
■ If room cooling is switched on:
Room cooling is carried out via a heating/cooling cir-
cuit that also supplies the ventilated rooms ("Heat-
ing circuit for blocking bypass damper 7D21").
This prevents the heat drawn off via the heating/cool-
ing circuit being reintroduced from the outside by the
ventilation unit bypass.

Passive cooling

With passive cooling, the ventilation unit uses the out-
door air for central cooling.
Note
Subject to the temperature conditions, only low cooling
capacities are available during passive cooling.
Vitovent 200-C: Conditions for passive cooling
Passive cooling ON
All of the following conditions must be met:
Outdoor air temperature (heat exchanger air intake) <
■
extract air temperature minus 4 K
Outdoor air temperature (heat exchanger air intake) >
■
"Min. supply air temperature for bypass 7D0F"
plus 0.5 K
Extract air temperature > "Set room temperature
■
7D08" plus 1 K
Passive cooling will not start if one of the following
conditions is met (bypass not active):
■ A sensor or fan fault has occurred.
■ Frost protection is active.
If central heating is switched on:
■
Central heating via one heating circuit that also sup-
plies the ventilated rooms ("Heating circuit for
blocking bypass damper 7D21").
This prevents heat supplied via the heating circuits
being routed outside via the bypass.
The electric preheating coil has been on in the last
■
10 min.
60
"Set room temperature
≤
(cont.)
Passive heating OFF
One of the following conditions must be met:
Outdoor air temperature (heat exchanger air intake)
≥
■
extract air temperature plus 3 K
Extract air temperature
■
7D08"
Vitovent 200-C:
■
The electric preheating coil has been on in the last
10 min.
■ Vitovent 300-F:
"Set room temperature 7D08" is set min. 4 K lower
than "Standard room temperature 2000".
With passive cooling, the outdoor air is not routed via
the heat exchanger, but instead via the bypass directly
into the rooms. The bypass opens and closes automat-
ically, depending on the following conditions:
Passive cooling OFF
One of the following conditions must be met:
Outdoor air temperature (heat exchanger air intake)
■
extract air temperature minus 3 K
Outdoor air temperature (heat exchanger air intake)
■
"Min. supply air temperature for bypass 7D0F"
plus 0.5 K
Extract air temperature
■
7D08"
"Set room temperature
≥
"Set room temperature
≤
≤
≥
≤