Installation manual

Webasto Product N.A., Inc. 12 www.techwebasto.com
Hot Air System Air Top 2000 S
7. 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.
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 selected value.
The internal diameter of the main section of the hot air line should be 60 mm (2.36 in.) minimum.
CAUTION: Only materials that can permanently withstand temperatures of at least 130°C (266°F)
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.
CAUTION: 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 (8 in.) away from all body parts.
Maximum pressure drop between the inlet and outlet side of the hot air line:
Air Top 2000 S 1.0 hPa
1 hPa corresponds to 1 mbar corresponds to 10 mm Water Column (0.4 inches Water Column).
If this value is exceeded the temperature limiter will trip. The hot air hose must be secured at its connection points.
If the heater is used in air recirculation mode, it must be used without any accessories for controlling the hot air (a short
circuit of the hot air flow must be avoided).
The hot air hose must be secured at its connection points.
If the heater is used in recirculation mode, for example, in the under bunk compartment of a truck’s sleeper, without a
hot air directional outlet grille, do not short circuit the hot air flow.
Figure 8. Hot air inlet and hot air outlet (recirculation mode)
CAUTION: If you use the heater without a hot air inlet hose, the inlet grille supplied with the
heater must be used at all times.