Webasto Air Top 3500 ST Workshop Manual - page 32
Air Top 3500/5000
8 Servicing
801
8
Servicing
8.1
General
This section describes the servicing procedures allowed
on the heater when installed.
8.2
Work on the Heater
For any type of work on the heater the fuses for the heater
must be removed. As long as the heater is in operation or
in run-down the battery main power supply must not be
disconnected to prevent the heater from overheating by
response of the overheat protection.
Repairs requiring a change of location the relevant
installation instructions and the vehicle specific heater
installation proposal have to be observed.
8.3
Work on the Vehicle
CAUTION
In the vicinity of the heater a temperature of 85° C must
under no circumstances be exceeded (e.g. during paint
work on the vehicle).
8.4
Heater Test Run
WARNING
The heater must not be operated in enclosed areas like
garages or workshops not provided with exhaust
ventilation facilities.
CAUTION
Operation of the heater without control unit cover is not
permitted and causes overheating.
8.5
Servicing
NOTE
To prevent seizure of mechanical components the heater
should be operated every 4 weeks for at least 10 minutes.
The heater does not require any maintenance. It should
however be inspected in regular intervals by Webasto
trained maintenance personnel, the latest date for
inspection being the start of the heating season (point of
time with increased use of heater).
To ensure functional reliability of the heater the following
servicing must be performed:
•
inspect heating air inlet and outlet for contamination
and foreign matter. (Contaminations or obstructions in
heating air lines may cause overheating and thus
response of the temperature limiter.)
•
clean heater exterior (prevent the ingress of water).
•
examine electrical connections for corrosion of
contacts and for security.
•
inspect combustion air and exhaust ducting for
damage and obstructions.
•
inspect fuel lines and fuel filter for leakage.
•
replace fuel filter, if installed.
8.6
Visual Inspections and Installation
Regulations
8.6.1 Heating Air System
CAUTION
Integration of the heater in the vehicles own air ducting is
not allowed due to the high pressure in the vehicle
system.
Both the circulation and ventilation mode of operation are
permitted. In fresh air ventilation mode ensure to use
heating air only from areas protected against splash and
spray water.
On the air intake side of the heater a temperature sensor
is located, which in combination with the control element,
makes the heater operate with adequate heating
performance dependent on air intake temperature and
control element setting. Heating performance is set so
that after fast heat-up to the preselected indoor
temperature this temperature will be maintained.
NOTE
In the fresh air ventilation mode of operation or when
installing the heater in an installation box, an external
temperature sensor must be mounted in the room area to
be under heat control!
The temperature sensor must not be mounted on exterior
walls without insulation. It must also be protected against
direct exposure to sun and draught wind.
Minimum inner diameter of heating air duct:
80 mm
Air Top 3500
90 mm
Air Top 5000
NOTE
For heating air ducting only materials with a temperature
resistance of at least 150° C may be used. The heating air
opening is to be located so that components not
temperature resistant are exposed to the heating air flow.