Checking The Domestic Ventilation System - Viessmann Vitovent 300 Service Instructions For Contractors

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 with combus-
tion air interconnection results in
dangerous negative pressure
inside the room. The negative
pressure can result in a return of
flue gases into the room.
■ 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 own
outdoor air and exhaust air
duct.
■ Keep doors to boiler rooms
where the combustion air sup-
ply is not interconnected with
the living space airtight and
shut.
Commissioning, inspection, maintenance
Information regarding the operation
of the Vitovent in conjunction with
open flue combustion equipment
■ Always install an interlock system on
site. In the case of negative pressure
inside the room, the interlock system
(e.g. air pressure switch "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 stat circuit must be disabled
and frost protection must be safeguar-
ded by an electric preheater bank
(accessory) or by means of a geother-
mal 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.
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