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Subject to change without notice
DehuTech 450
Installation and service access
Dehumidifier DehuTech 450 is designed for
indoor installation. The dehumidifier should be
installed horizontally.
All components in the dehumidifier are acces-
sible from the top of the unit. For inspection
and service, a space of 400 mm must be left
free above the dehumidifier to accommodate for
servicing of filters, fans and rotor.
The dehumidifier can be installed in the room
that should be dehumidified or in a separate
plant room.
To obtain the best performance the outlets from
the fans should be equipped with diffusors.
Wet air duct out from dehumidifier
The wet air from the dehumidifier should be
exhausted to the outside. The duct should be as
short as possible to minimise the chance of con-
densation of the wet air. This duct should slope
down slightly to stop any condensed water from
flowing back into the dehumidifier.
If the wet air duct is extremely long, or must be
installed sloping upwards from the dehumidifier,
it should be insulated and have a drainage point
(2 mm) drilled at its lowest position.
A damper should be installed in the wet air duct
to enable correct setting of the reactivation air
volume during commissioning.
The exhaust opening should have a coarse wire
net.
Reactivation air into the dehumidifier
The reactivation air duct into the dehumidifier
should be as short as possible. The intake open-
ing of the duct should have a coarse wire net, to
stop foreign objects from entering the dehumidi-
fier. No insulation is needed and the duct can
slope up- or downwards. In some installations,
as an alternative, the reactivation air can be
taken from the installation room, for this alterna-
tive no duct connection is needed.
Process and dry air with the dehumidifier
installed in the dehumidified room
When the dehumidifier is installed in the dehu-
midified room it would normally take the proc-
ess air directly from the room without any duct
system, with only a protection net for the inlet
required. The dry air outlet would normally have
a duct system designed for distribution of the
Process and dry air with the dehumidifier
installed outside the dehumidified room
When the dehumidifier is installed in a separate
plant room all inlet and outlet openings are usu-
ally ducted.
The dehumidifier takes the process air as ambi-
ent air, or as pre-treated air (cooled/heated), or
alternatively as return air from the dehumidified
room. The dry air from the dehumidifier can be
connected for post treatment or ducted back to
the dehumidified room.
A damper can be installed in the process air
duct, enabling correct commissioning of the dry
air volume.
Duct connection for basement
installation
If the dehumidifier should be installed in the
basement it is sometimes desirable to achieve a
slight negative pressure in the space to prevent
odours from penetrating up into the building. In
these circumstances the reactivation air is taken
directly from the basement and the wet air is
exhausted out from the basement. This method
of installation will create a small negative pres-
sure. The ducts should be installed according to
”Duct connections for permanent installation”.
