14
4.3 Operating unit
The control unit settings can be customised with the oper-
ating unit. Parameters can be congured quickly and easily
with the LCD graphical display, the menu structure in
German or English and the parameters displayed in plain
text.
Fig. 18: Operating unit
4.4 Rotational speed monitoring
The speed of rotation of the wheel can be monitored with an
inductive sensor. Stoppages, e.g. caused by a broken v-belt,
can be detected quickly and the cause can be corrected.
4.5 Inspection cover
The motor and the v-belt can be inspected through inspec-
tion covers on both sides. This is recommended if inspection
from the side is not possible.
Notice
Inspection covers cannot always be installed in small
casing dimensions. If applicable, this is shown in the
Hoval CASER design program. Detailed information
can be obtained from Hoval's application consulting
service.
4.6 Purge sector
When correctly laid out, the purge sector reduces the
transmission of extract air to the supply air. The size can be
congured individually to reduce the purge and energy loss
to a minimum.
Instructions for the optimum settings can be found in
Section '7.6 Using and setting the purge sector'.
Factory setting: 3°
Fresh air
Exhaust air
Fig. 19: Purge sector
4.7 Duct design
The side walls of the casings in Hoval rotary heat
exchangers with ducts are enclosed. This makes them suit-
able for the duct connection.
4.8 Coated casing
Hoval rotary heat exchangers with coated casings are avail-
able for applications with very high hygiene requirements
(e.g. hospitals): powder-coated red (RAL 3000).
4.9 Offset wheel position
The hub can be offset for optimum adjustment to the installa-
tion situation (such as installation in a ventilation unit).
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