Technical data

Air Top 2000 ST Servicing work
801
8Servicing work
8.1 General
This section describes the servicing work that can be carried
out on the heater when it is installed.
8.2 Work on the heater
Disconnect the main power cable from the vehicle’s battery
before carrying out any work on the heater. The main
battery power must not be disconnected whilst the heater is
operating or slowing down as a result of the risk of the
heater overheating and the overheating guard thus being
tripped. If you wish to carry out extensive repair work on the
heater, it may be a good idea to remove it completely.
Refer to the relevant installation instructions and the
installation proposal for the heater for the specific vehicle
for repairs that necessitate the installation position being
changed.
8.3 Work on the vehicle
IMPORTANT
A temperature of 85 °C must not be exceeded in the vicinity
of the heater in any circumstances (for example when
competing painting work on the vehicle).
8.4 Heater trial
WARNING
The heater must not be operated in enclosed areas such as
garages and workshops without an emissions extraction
system, even if you use the timer.
IMPORTANT
The heater must not be operated without the cover for the
control unit as this will cause it to overheat.
8.5 Servicing work
NOTE
To prevent mechanical parts seizing, the heater should be
operated for approx. 10 minutes every four weeks.
The heater requires no servicing. However, it should be
checked at regular intervals, at the latest at start of the
heating period (the time after which the heater will be used
due to adverse weather conditions) by Webasto-trained
personnel.
The following servicing work is to be carried out to maintain
the functional reliability of the heater:
• Check the hot air inlet and outlet for dirt and foreign
bodies. (Dirty or blocked hot air lines may cause
overheating.)
• Clean the exterior of the heater (avoid the ingress of
water).
• Check the electrical connections for contact corrosion
and to ensure that they are secure.
• Check the exhaust and combustion air lines for signs of
damage and to ensure that they are clear.
• Replace the fuel filter if there is one.
• Check the fuel line and filter for leaks.
8.6 Visual inspections and installation
instructions
8.6.1 Hot air system
IMPORTANT
The integration of the heater into the vehicle’s own air
system is not permitted as a result of the high pressure in the
vehicle’s 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 setpoint
generator. The heat output is set so that after the selected
interior temperature has been reached quickly, it is then
kept at this selected value. Alternatively the heaters can be
operated with an external temperature sensor (see 9.1.2).
NOTE
Only materials that can permanently withstand
temperatures of at least 130 °C may be used for the hot air
line.
Maximum pressure drop between the inlet and outlet side
of the hot air line 1.5 hPa (corresponds to 1.5 mbar resp.
15 mm water column).
If this value is exceeded the heat output may be reduced as
a result of the hot air outlet temperature control.
The internal diameter of the main section of the hot air line
should be 60 mm.
When using narrower lines, the permissible pressure drop is
exceeded more quickly.
The hot air hose must be secured at its connection points.
The heater can be used with grills on the air inlet and outlet
side if it is used in an air circulation system. Do not short
circuit the current of hot air.