Air Top Evo 3900 / Air Top Evo 5500
Hot air system
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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.
Recommended internal diameter of the main section of the
hot air line
:
90 mm for the Air Top Evo 5500 80 mm for the Air Top Evo 3900
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 Evo 3900 2.0 hPa
Air Top Evo 5500 3.0 hPa
1 hPa corresponds to 1 mbar corresponds to 10 mm 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.
IMPORTANT
If you use the heater without a hot air inlet hose, the inlet grille supplied
with the heater must be used at all times.
Fig. 7
Hot air inlet and hot air outlet
Installation_Instructions_Air_Top_Evo_3900_5500_de_en_nl.book Page 63 Wednesday, November 3, 2010 11:58 AM
