Webasto Air Top 3500 ST Installation Instructions Manual - page 13
Air Top 3500 ST / Air Top 5000 ST
Hot air system
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Hot air system
NOTE:
The heater must not be integrated into the vehicle’s air system.
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
appropriate zone. The standard pause speed is 0 rpm if the external
temperature sensor is used.
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 setpoint generator. The heat output is controlled such that after
the selected interior temperature has been reached quickly, it is then
kept at this selected value.
Recommended internal diameter of the main section of the hot air line:
90 mm for the Air Top 5000 ST
80 mm for the Air Top 3500 ST
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
positioned 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 3500 ST 2.0 hPa
Air Top 3500 ST Volume Plus 3.0 hPa
Air Top 5000 ST 3.0 hPa
1 hPa corresponds to 1 mbar corresponds to 10 mm WC.
The heaters check the internal temperature rise automatically each time
they are switched on. If this is above the specified limits, the start is
cancelled and error messages F10 is displayed. To ensure that the
heater functions 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.