Hot Air System - Webasto Air Top 2000 ST B Installation Instructions Manual

Air Top 2000 ST
6

Hot air system

NOTE:
The heater must not be integrated into the vehicle's air system.
Inside the control unit there is a temperature sensor, which operates the
heater in the appropriate heat output range in conjunction with the control
element depending on the intake temperatures and the position of the set-
point generator. The heat output is controlled such that after the selected
interior temperature has been reached quickly, it is then kept at this select-
ed value.
Both recirculation and fresh air modes are possible.
For fresh air mode it must be ensured that the hot air is taken from an area
protected from splashing water and spray and in such a way that no water
can ingress into the heater if the vehicle travels through a water hazard for
which that vehicle is licensed.
NOTE:
For fresh air mode an external temperature sensor must be fitted in the ap-
propriate zone.
The internal diameter of the main section of the hot air line should be 60
mm.
NOTE:
Only materials that can permanently withstand temperatures of at least
130 °C may be used for the hot air line. The hot air opening is to be posi-
tioned in such a way that the air is not blown on to any parts that cannot
withstand the heat.
IMPORTANT
In vehicles used to transport people, the air outlet opening is to be directed
in such a way that it is at least 20 cm away from all body parts.
Maximum pressure drop between the inlet and outlet side of the hot air
line:
Air Top 2000 ST 1.5 hPa
1 hPa corresponds to 1 mbar corresponds to 10mm WC (water column).
The heaters check the internal temperature rise automatically each time
they are switched on. If this is above the specified limits, the start is can-
celled and error messages F10 is displayed. To ensure that the heater func-
tions stably, the flow resistance of the connected hot air system must be
reduced.
The points table for air guide parts in the Webasto catalogue may be used
to design the hot air system.
The hot air hose must be secured at its connection points.
If the heater is used in recirculation mode without a hot air guide, do not
short circuit the hot air flow.
Fig. 6: Hot air inlet and hot air outlet
Hot air system
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