Technical data

Heating Air System
NOTE:
It is not permissible to integrate the heater into the vehi-
cle’s air ducting system.
The air heater can be operated in the recirculating air
mode only.
A temperature sensor is installed in the heater on the heat-
ing air intake side which, in conjunction with the heater con-
trol element and dependent upon the intake temperature
and position of the setpoint transmitter, operates the
heater within the appropriate heat output range. Heat out-
put is so adjusted that after a quick reaching of the preset
interior temperature the same will be maintained at the
preset value.
Minimum inside diameter of heating air pipe is 55 mm
(nominal diameter is 60 mm)
NOTE:
For heating air ducts only materials capable of withstand-
ing a temperature of at least 130° may be used.
The hot air discharge opening is to be located so that the
hot air is not directed onto parts that are not resistant to
heat.
CAUTION:
In vehicles designed for the transportation of passengers,
the air outlet openings must be arranged in such a way
that they cannot be obstructed by passengers.
Maximum air pressure drop between intake and delivery
side of the heating air line: 1.0 mbar (head of water: 10
mm).
If this value is exceeded, the temperature limiter is ex-
pected to trip. The heating air hose is to be secured at the
joints.
When operated in the recirculating mode, the heater
can also be used without any accessories for the heat-
ing air circuit (the hot air must be prevented from re-
entering the heating circuit).
NOTE:
The installation must be checked for the following:
- “closed circuit” of air between the vehicle heater and the
heater air inlet
- “closed circuit” of air between heater air inlet and heater
air outlet
- adequate space for taking in heating air (heating air to be
extracted from the cool space of the cabin, e.g. in the
case of installation underneath a bunk)
If an installation housing is used, the area around the air
discharge nozzle must be tightly sealed so that no hot air
can enter the installation box.
External Temperature Sensor
The installation of an external temperature sensor is rec-
ommended if the heater is installed in an installation hous-
ing or in location with poor ventilation (e.g. under-neath
bunks). Extremely short cycle times of the heater can thus
be avoided.
Mounting of External Temperature Sensor
The external temperature sensor must be mounted in the
vehicle cab at mid-height on surfaces as vertical as
possible.
- The temperature sensor must not
- be located directly in the hot air stream (vehicle’s or
heater’s heating air).
- be mounted in the vicinity of heat sources (e.g. vehicle’s
heating system).
- be exposed to direct sun radiation (e.g. on the dash-
board).
- be mounted behind curtains or the like.
Fig. 7: Heating air inlet and heating air outlet
Air Top 2000 S
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