Checking The Domestic Ventilation System - Viessmann Vitovent 300 Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the domestic ventilation system

Danger
The simultaneous operation of
open flue combustion equipment
(e.g. an open fireplace) and the
Vitovent in a space where the
combustion air supply is intercon-
nected results in dangerous neg-
ative pressure inside the room.
The negative pressure can result
in a return of flue gases into the
room interior.
■ Never operate the Vitovent
simultaneously with open flue
combustion equipment (e.g.
open fireplace).
■ Only operate solid fuel com-
bustion equipment in bal-
anced flue mode with its inde-
pendent outdoor air and
exhaust air duct.
■ Doors to heating rooms where
the combustion air supply is not
interconnected with the living
space must be airtight and
must be kept shut.
6
Information regarding the operation
of the Vitovent 300 in conjunction
with open flue combustion equipment
■ Always install an interlock system on
site. In case of negative pressure
inside the room, the interlock system
(e.g. air pressure limiter "P4" made by
Erich Huber, www.luftdruck-
waechter.de) must switch off the
Vitovent.
■ The relevant flue gas inspector must
give his approval [check local regula-
tions].
■ The frost protection must be disabled
(remote control) and frost protection
must be ensured through an electric
preheater bank (accessory) or a geo-
thermal heat exchanger (on-site).
!
Please note
The simultaneous operation of
extractor hoods or tumble dryers
and the Vitovent in interconnec-
ted rooms results in negative
pressure inside the room.
■ Never link extractor hoods and
tumble dryers into the Vitovent
duct system.
■ Set up extractor hoods in the
kitchen either to recirculate air
or to expel the air to the out-
side.
Recommendation: Recirculat-
ing extractors offer a better
energy balance.