11
•
To be able to make two openings one above the other
the corner frames of the two openings have a different
length so that there is always enough space to place
and attach the profiles. Using the drive slip means that
there is no need to use screws in the limited space
between the two ducts that are one above the other,
as shown in the drawing below.
•
The corner frame has a length of 32 or 72 mm and
extends 22 or 62 mm beyond the external AHU
dimension, as shown in the drawing below.
•
The flexible connection, including the installed corner
frame, extend 170 mm beyond the external AHU
dimension, and a damper set 132/172 or 207/247
mm, as shown in the drawing below.
Legend
1. AHU
2. Flexible connection or damper
3. Duct connection
(single-skin flexible connection - ± 30 mm press fit)
•
The combination of flexible connections and dampers,
including the installed corner frame, extends 302/337
or 342/417 mm beyond the external AHU dimension,
as shown in the drawing below.
If these can be expected for the installation or geographical
location, try to minimise them with partitions. If there is any
possibility that rain water can be drawn in, droplet
eliminators must be added behind the air intake grille. A
pre-heater for the filters can be installed to prevent that
mist causes the filters to become too wet. The pre-heater
will reduce the relative humidity of the air.
Connection of the outdoor air intake duct
If condensation can be expected in or on the ducts, these
must be insulated on the outside.
To connect the outdoor air intake duct to a unit that is
installed inside we recommend the following procedure:
• Connect a 500 mm long adapter piece to the corner
frame of the air handling unit.
• Insulate the inside of the complete adapter piece up to
the unit panel.
• Insulate the outside of the adapter piece so that there
is a 250 mm overlap between inside and outside
insulation.
• The remainder of the adapter piece needs to be
insu-lated on the outside, as shown in the drawing
below.
4.1.6 - Outdoor air intake
•
Ensure that the air intake duct is correctly connected.
High air velocities must be avoided and no rain drops
should get into the duct. This can be prevented by
installing rain protec-tion air intake grilles (Caution: The
maximum air velocity for the grille is as given by the
supplier). The rear air intake duct must be sized to
avoid higher than allowable air veloci-ties in the grille.
High air velocities in the openings can also be caused
by wind attacks at one of the openings.
(single-skin flexible connection - ± 30 mm press fit)
Legend
1. AHU
2. Duct connection
Legend
1. AHU
2. Damper
3. Flexible connection
4. Duct connection
302/337 or 342/417 mm
170 mm
132/172 or 207/247 mm
22/62 mm
