Fig. 901 External Room Temperature Sensor; Repair - Webasto Air Top Evo 40 Workshop Manual

Repair

9 Repair
9.1 General information
This section describes the repair work that can be carried out
on the Air Top Evo 40 / Air Top Evo 55 heater after it has been
removed from the vehicle.
Any further dismantling will invalidate the warranty. Only use
the spare parts from the appropriate spare parts kits for as-
sembling the heater.
9.1.1 Measures on dismantled components
IMPORTANT
All sealing elements between the dismantled components
and the base seal must always be replaced with new seals.
9.1.1.1 Cleaning
• All dismantled components must be cleaned and then
dried.
• Existing seal residues on the components must be
completely and carefully removed.
9.1.1.2 Visual inspection
• Inspect all components for damage (cracks, deformation,
wear, etc.) and replace if necessary.
• Inspect the plugs and cables for corrosion, loose
contacts, crimping faults, etc. and repair them if
necessary.
• Check plug strips for signs of corrosion and contacts to
ensure they are secure. Repair them if necessary.
9.1.2 Carrying out modifications
The constant development of our heaters is aimed at optimis-
ing them so as to prevent failures and malfunctions.
Generally it is possible to modify heaters that are already in
use. Corresponding modification kits are available for this
purpose.
The following describes modifications that can be carried out
without any great effort during standard repair work:
• Installation of an external room temperature sensor for
better temperature control (see Section 9.1.2.1).
901
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Air Top Evo 40 / Air Top Evo 55
9.1.2.1 Installation of an external room temperature
sensor
General information
The Air Top Evo 40 / Air Top Evo 55 heater optimally regulates
the desired temperature when its temperature sensor is load-
ed with the air temperature of the main occupied area. In cer-
tain circumstances, this is not always possible using the room
temperature sensor integrated in the control unit due to the
installation circumstances. In this case, optimum temperature
control can be ensured using an external room temperature
sensor fitted in the appropriate area.
Method
1. Select a suitable position for an external room
temperature sensor.
• The external room temperature sensor should not be in
the direct line of hot air and not close to heat sources (for
example the vehicle's own heating system).
• The external room temperature sensor is to be installed
at medium height in the vehicle cabin on surfaces that
are as vertical as possible.
• The installation site should not be exposed to direct
sunlight.
• Do not install the external room temperature sensor
behind curtains or the like.
2. Remove the cover and pull blind plug off control unit
(connector X5).
3. Install the external room temperature sensor and route
the cable to the heater.
4. Connect the plug on the external room temperature
sensor to socket X5 on the control unit and fit the cover.
5. Conduct a trial and check the control properties.
2
Fig. 901 External room temperature sensor
1. Cover
2. External room temperature sensor
NOTE
1