Servicing - Webasto Air Top 2000 STC Workshop Manual

8 Servicing

8 Servicing
8.1 General information
This section describes the servicing jobs that can be carried
out on the heater when installed.
8.2 Working on the heater
Always disconnect the main power cable from the vehicle
battery before carrying out any work on the heater. The main
battery power must not be disconnected whilst the heater is
operating or afterrunning due the risk of the heater
overheating and consequently the overheating safeguard
tripping. If extensive repair work is to be carried out on the
heater, it may be a good idea to remove it completely.
Refer to the relevant installation instructions and the
recommended vehicle-specific installation position for repairs
that require the heater to be installed in a different position.
8.3 Working on the vehicle
ATTENTION
On no account must a temperature of 85 °C be exceeded in
the vicinity of the heater (e.g. vehicle paintwork).
8.4 Heater test run
CAUTION
Even if you use the timer, the heater must not be operated in
enclosed spaces such as garages and workshops without an
emissions extraction system.
ATTENTION
The heater must not be operated without the control unit
cover as this will cause the heater to overheat.
8.5 Servicing
The heater should be operated for approx. 10 minutes every
4 weeks to prevent mechanical parts seizing.
The heater requires no maintenance. It should however be
checked at regular intervals, at the start of the heating period
at the latest (when the heater will be used more frequently
due to colder weather conditions) by Webasto-trained
technical personnel.
The following servicing jobs should be carried out to maintain
the functional reliability of the heater:
801
NOTE
• Checking heating air inlet and outlet for dirt and foreign
objects. (Dirty or blocked heating air lines can cause over-
heating.)
• Cleaning heater exterior (make sure no water gets in).
• Checking electrical connections for contact corrosion
and ensuring they are secure.
• Checking exhaust and combustion air intake lines for
damage and ensuring they are clear.
• Replacing fuel filter, if fitted.
• Checking fuel line and filter for leaks.
8.6 Visual inspection and installation
requirements
8.6.1 Heating air system
ATTENTION
Due to the high pressure in the vehicle system, it is not
permitted to integrate the heater into the vehicle's air
circulation system.
On the inside of the control unit there is a room temperature
sensor which operates the heater in the heating output range
corresponding to the intake air temperature and setting of
the control element. The heating capacity is set such that,
after the selected interior temperature has been reached
quickly, the output is maintained at the preselected value.
Alternatively, the heaters can be operated with an external
room temperature sensor (see 9.1.2).
Only materials that can permanently withstand temperatures
of at least 130 °C are to be used for the heating air duct.
Maximum pressure drop between the intake and pressure
side of the heating air line 1.5 hPa (corresponds to 1.5 mbar
or 15 mm water column).
The heating air outlet temperature control may reduce the
heating capacity if this value is exceeded.
The inside diameter of the main section of the heating air line
should be 60 mm.
The permissible pressure drop will be exceeded faster if
smaller diameter lines are used.
The heating air hose is to be secured at the connection
points.
The heater can be used in recirculated air mode if there is a
grille on the heating air inlet and outlet side. Avoid short-
circuiting the heating air flow.
Air Top 2000 STC
NOTE