Viessmann H32E, Installation And Service Instructions Manual, Page: 11 / 80

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Weight: 1.55 kg
Thermal insulation of the ductwork
■ Thermally insulate the outdoor air and exhaust air
ducts to prevent the formation of condensate, as
specified by DIN 1946-6; these must also have an
external vapour barrier.
■ Supply air and extract air ducts which pass through
unheated parts of the building must be insulated with
vapour diffusion-proof thermal insulation material.
■ Heat losses from the ductwork must be kept to a
minimum to ensure optimum heat recovery with the
Vitovent.
Thermally insulate all ductwork in unheated areas in
line with DIN 1946-6 using vapour diffusion-proof
material.
Insulation measures:
■ Insulate in accordance with current engineering
standards.
■ Use tape to make the connections airtight.
■ Avoid gaps.
■ Isolate ceiling and wall outlets with insulation strips.
■ Suitable insulation material could be Armaflex
for example.
Open flue combustion equipment and Vitovent
Danger
The simultaneous operation of open flue com-
bustion equipment (e.g. an open fireplace) and
the ventilation system in a space with combus-
tion air interconnection results in dangerous
negative pressure in the interior. Negative pres-
sure can result in flue gas re-entering the room.
In order to prevent health risks, observe the fol-
lowing:
■ Never operate the Vitovent simultaneously with
open flue combustion equipment (e.g. open fire-
place).
■ Only operate combustion equipment in room sealed
mode with a separate combustion air supply. We rec-
ommend combustion equipment that has general
building approval as
room sealed combustion equip-
ment from the Deutsches Institut für Bautechnik
(DIBt) [Germany].
■ Keep doors to boiler rooms that are not part of the
combustion air interconnection with the living space
airtight and shut.
Information regarding the operation of the ventila-
tion system in conjunction with open flue combus-
tion equipment
■ On-site safety equipment must be installed that will
switch off the ventilation unit when there is negative
pressure inside the room.
■ The relevant flue gas inspector must give their
approval [check local regulations].
■ Ensure frost protection of the countercurrent heat
exchanger, e.g. with a preheating coil or geothermal
heat exchanger.
Extractor hoods, extracting tumble dryers and the Vitovent
!
Please note
The simultaneous operation of extractor hoods
or extracting tumble dryers and the ventilation
unit in interconnected rooms results in negative
pressure inside the room.
Never link extractor hoods or extracting tumble
dryers into the ventilation unit ductwork.
Set up kitchen extractor hoods as recirculating
extractors , which is more energy efficient.
Preparing for installation
Preventing flow noise and pressure drop
(cont.)
5831646
Installation