C1A0 Bypass Mode - Viessmann VITOTRONIC 200 Service Instructions Manual

C1A0 Bypass mode

Vitovent
200-C 200-W 300-C
X
—
How the bypass system works.
C1A1 Central heating and heat recovery
Vitovent
200-C 200-W 300-C
— —
C1A2 Imbalance permitted
Vitovent
200-C 200-W 300-C
X
—
Balancing of flow rate differences
Due to the conditions in the building, an unwanted dif-
ferential may occur between the supply air and extract
air flow (disbalance), e.g. through different lengths of
ductwork for outdoor/supply air and extract/exhaust air.
To balance out any flow rate differential, the supply air
flow rate can be increased or decreased compared to
the extract air flow. This is specified on the ventilation
unit using "Specified imbalance C1A3": Set "Imbal-
ance permitted C1A2" to "1"
Note for Vitovent 200-W
This setting does not apply for Vitovent 200-W: With
this ventilation unit, the air flow rates for the supply air
and extract air side can be set separately for each ven-
tilation level, e.g. with "Background ventilation
C109" and "Background ventilation, second fan
duct C189".
!
300-F 300-W
X X
—
300-F 300-W
X X
—
!
300-F 300-W
X X
—
Value Meaning
"0" Bypass can automatically be activated for
passive cooling.
Note
Further conditions must be met in order for
passive cooling to be switched on: See chap-
ter "Passive cooling" in the "Function descrip-
tion".
"1" The bypass is permanently closed. Heat re-
covery at the heat exchanger is switched on.
"2" The bypass is permanently active. Heat re-
covery at the heat exchanger is switched off.
!
Never adjust
Air flow rate for frost protection
If the output of both the factory-fitted and the additional
electric preheating coils (accessories, installation in
outdoor air duct) is not sufficient, the air flow rate is
reduced to protect the heat exchanger. Depending on
the setting, both air flow rates or only the supply air
flow rate are reduced.
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.
Parameter group Ventilation
263