Work On Heater - Webasto Air Top Evo 40 Workshop Manual

Air Top Evo 40 / Air Top Evo 55
8 Service Work
8.1 General information
This section describes the servicing work that can be carried
out on the heater when it is installed.
8.2

Work on 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 operat-
ing or slowing down as this could result in the heater over-
heating 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.
When the heater is removed and reinstalled, the base seal
must be replaced.
With repairs which make it necessary to change the installa-
tion location, the installation instructions concerned and the
vehicle-specific installation suggestion of the heater must be
observed.
8.3 Work on vehicle
IMPORTANT
A temperature of 85 °C must not be exceeded in the vicinity
of the heater in any circumstances (for example when com-
pleting painting work on the vehicle).
8.4 Heater test operation
WARNING
The heater must not be operated in enclosed areas such as
garages and workshops without an emissions extraction sys-
tem, even if you use the timer.
IMPORTANT
The operation of the heater without a cover for the control
unit is not permissible and will result in overheating.
8.5 Servicing work
To prevent mechanical parts seizing, the heater should be op-
erated for approx. 10 minutes every four weeks.
The heater requires no servicing. However, it should be
checked at regular intervals, at least at the start of the heat-
ing period (the time after which the heater will be used due
to adverse weather conditions) by Webasto-trained person-
nel.
Visit www.butlertechnik.com for more technical information and downloads.
NOTE
www.butlertechnik.com
After 3,000 operating hours a flash code (flashing pulses at
one-second intervals) is displayed via the operating indicator.
This code indicates the need for maintenance/servicing of the
heater to the user. The service signal is displayed for 10 sec-
onds during each heater start-up and can be reset with the
Webasto diagnosis with "Delete fault" or by pulling the fuse.
In the interest of the functional reliability of the heater, the
following service work must be carried out:
• Check the cold air inlet and hot air outlet for dirt and for-
eign bodies. (Dirty or blocked cold and hot air lines may
cause overheating.)
• Clean the outside of the heater (avoid the penetration 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 fuel filter if installed.
• Check the fuel line and filter for leaks.
8.6 Visual inspections and installation
instructions
8.6.1 Cold and hot air system
IMPORTANT
The integration of the heater into the vehicle's own air sys-
tem is not permitted as a result of the high pressure in the ve-
hicle's system.
Inside the control unit there is a room 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 gen-
erator. The heat output is set so that after the selected inte-
rior temperature has been reached quickly, it is then kept at
this selected value.
As an alternative, the Air Top Evo 40 / Air Top Evo 55 heaters
can be operated with an external temperature sensor (see
Section 9.1.2).
Only materials with a continuous temperature resistance of at
least 130 °C may be used for the hot air guide.
The maximum pressure difference between the intake and
pressure side of the cold and hot air line is:
Air Top Evo 40:
Air Top Evo 55:
When this value is exceeded, the heating capacity can be
reduced by the hot air outlet temperature controller.
The heater can be used with grills on the cold air inlet and hot
Service Work
NOTE
2.0 hPa
3.0 hPa
801