Webasto Air Top 2000ST Installation Instructions Manual page 20

9.3 Hot air intake
WARNING! Hot air intake from a clean area without exhaust gasses. Not from the engine
compartment.
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The intake opening can not be blocked by stowed articles.
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Intake through an inlet hose leads to pressure losses. Consider this in the resistance
calculations.
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Use grilles or intake protection so that foreign objects cannot be drawn into the heater.
It is possible to use the warm air intake for fresh-air operation or recirculation.
9.3.1 Fresh air operation
Draw in heating air from the outside, heat and blow into interior areas. This renews the cabin air and
reduces the humidity. Pay attention to the outlet opening in the cabins. For temperature control, an
external temperature sensor should preferably be installed in the salon.
In summer, ventilation is also possible (ventilation switches on the control panel are required).
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Warm air intake directly from the lockers or control cabinets, if this is dry, clean, noise free
and exhaust gas free. For proper ventilation observe an intake diameter of ≥ 1.5 x diameter
of the heater system.
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otherwise use an intake hose for intake from outside.
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Avoid the ingress of water into the intake openings.
Air intake for well ventilated lockers
9.3.2 Circulation air
With recirculation the heating air is taken from the interior air. The advantage is fast arming up
through better use of the heat. However, there is no reduction in the humidity or renewal of the air.
20
Marine heating system Installation Instructions
Air intake through an inlet hose, straight
from the outside.
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