Webasto Air Top 3500 ST Workshop Manual - page 40
Air Top 3500/5000
9 Repair
901
9
Repair
9.1
General
This section describes the repairs that may be performed
on the heaters Air Top 3500 and Air Top 5000 when
removed.
Any further disassembly will void the warranty. For
assembly only spares from the original spares kits must
be used.
9.1.1 Work on Components after Disassembly
CAUTION
All gaskets located between disassembled components
as well as the gasket on the exhaust outlet must always
be discarded and replaced.
9.1.1.1 Cleaning
•
All components disassembled must be cleaned with
cleaning spirit and blown dry with pressurised air.
•
Sealing compound on components must be carefully
and completely removed using suitable means.
9.1.1.2 Visual Inspection
•
Inspect all components for damages (cracks,
deformation, wear, etc.) and replace as required.
•
Inspect connectors and wiring for corrosion, loose
contacts, wrong crimping, etc. and repair as required.
9.1.2 Modification Procedures
NOTE
A continuous design improvement of the heaters is
intended for their optimization to prevent failures or
malfunctions.
Normally equipment already in operation may be modified
by retrofits using the relevant modification kits available.
The following details modifications, which may be easily
performed at low expenditure during repairs:
•
installation of an external temperature sensor for best
temperature control (see 9.1.2.1).
•
installation of a burner with shield (see 9.1.2.2).
9.1.2.1 Installation of an External Temperature Sensor
General
The heater Air Top 3500 and Air Top 5000 control the
desired temperature the best when the air temperature of
the most frequented area is applied to its temperature
sensor. This may sometimes not be possible for the
temperature sensor integrated in the heater due to
unfavourable installation conditions. In such case optimum
temperature control may be achieved by installing an
external temperature sensor in the appropriate room area.
Procedure
1. Select appropriate installation location for the external
temperature sensor.
NOTE
•
The temperature sensor should not be directly
exposed to warm air flow and not be located in the
vicinity of heat sources (e.g. vehicle's own heating
system).
•
It should be mounted in mid height of the vehicle cabin
on possibly vertical surfaces.
•
The installation location should not be exposed to
direct sunlight.
•
Do not mount temperature sensor behind curtains or
similar.
2. Remove cover (see 9.2.1.1) and pull off internal
temperature sensor.
3. Mount external temperature sensor and route cable to
heater.
4. Connect electrical connector and fit cover.
5. Perform heater test run and check control behaviour.
External temperature sensor
Cover