User`s manual

ML180-MLT350 Dehumidifiers
190TGB-1034-A 2 Installation 11
• The total resistance in the process and reactivation air ductwork
must not exceed the performance rating of the fans fitted in the
dehumidifier. For details of minimum available static pressure, see
section 6.5, Technical Specifications.
Figure 2-3. Wet air outlet design
2.8.2 Ductwork for Outdoor Air Inlet
When bringing outside ambient air into the dehumidifier, the opening
to the inlet duct should be sufficiently located above ground level to
prevent the pick-up of dust and debris. The ducting should be designed
to prevent rain and snow from being drawn into the dehumidifier. The
air inlet must be located away from possible contaminations such as
engine exhaust gases, steam and harmful vapours.
To prevent the wet (outlet) air humidifying the reactivation (inlet) air,
the air inlet for reactivation must be located at least 2m from the air
outlet for wet air Refer to figure 2-4, Outdoor air inlet design.
2.8.3 Ductwork for Wet Air Outlet
Wet air ducting should be manufactured in corrosion resistant material
(e.g. stainless steel, aluminium or plastic) and should be capable of
withstanding temperatures of up to 100°C.
CAUTION! The wet air ducting must always be insulated if there is a risk of
freezing. Due to the high moisture content in the wet air leaving the dehumidifier
condensation will readily form on the inside duct walls.
Horizontal duct-runs must therefore be installed sloping downwards (away from
the dehumidifier) to allow for condensate drainage. The slope should be a
minimum of 2cm per meter duct. In addition, 5mm drain hole should be drilled
at the low points in the duct to prevent water accumulating in the duct. See
figure 2-3, Wet air outlet design.
Wire netting, mesh
width about 10 mm
Wire netting, mesh
width about 10 mm
To Condensate Drain
Wet
Air
Wet
Air
Downward slope away
from dehumidifier
Horizontal Wet
Air Outlet
Vertical Wet
Air Outlet