Webasto Air Top 2000 ST D Service And Repair Manual - page 27
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27
Webasto Product N.A., Inc.
AIR TOP 2000 ST
SERVICING WORK
8.
SERVICING WORK
8.1
G
ENERAL
This section describes the servicing work that can be
carried out on the heater when it is installed.
8.2
W
ORK
ON
THE
H
EATER
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 operating or slowing down as a result of the risk
of the heater overheating 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.
Refer to the relevant installation instructions and the
installation proposal for the heater for the specific vehicle
for repairs that necessitate the installation position being
changed.
8.3
W
ORK
ON
THE
V
EHICLE
CAUTION: A temperature of 85 °C (185 °F)
must not be exceeded in the vicinity of the
heater in any circumstances (for example
when completing painting work on the
vehicle).
8.4
H
EATER
T
RIAL
WARNING: The heater must not be
operated in enclosed areas such as garages
and workshops without an emissions
extraction system, even if the heater is
equipped with a timer.
CAUTION: The heater must not be
operated without the cover for the control
unit as this will cause it to overheat.
8.5
S
ERVICING
W
ORK
NOTE: The heater should be operated for
approximately 20 minutes every 4 weeks to
prevent mechanical parts seizing.
The heater requires no servicing. However, it should be
checked at regular intervals, at the latest at start of the
heating period (the time after which the heater will be
used due to adverse weather conditions) by Webasto-
trained personnel.
The following servicing work is to be carried out to
maintain the functional reliability of the heater:
•
Check the hot air inlet and outlet for dirt and foreign
bodies. (Dirty or blocked hot air lines may cause
overheating.)
•
Clean the exterior of the heater (avoid the ingress 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 the fuel filter if there is one.
•
Check the fuel line and filter for leaks.
8.6
V
ISUAL
I
NSPECTIONS
AND
I
NSTALLATION
I
NSTRUCTIONS
8.6.1
H
OT
A
IR
S
YSTEM
CAUTION: The integration of the heater
into the vehicle’s own air system is not
permitted as a result of the high pressure in
the vehicle’s system.
Inside the control unit there is a temperature sensor,
which operates the heater in the appropriate heat output
range in conjunction with the control element depending
on the intake temperature and the position of the control
element’s dial. The heat output is set so that after the
selected interior temperature has been reached quickly, it
is then kept at this selected value. Alternatively, the
heaters can be operated with an external temperature
sensor (see 9.1.2).
NOTE: Only materials that can permanently
withstand temperatures of at least 130 °C may
be used for the hot air line.
Maximum pressure drop between the inlet and outlet
side of the hot air line 1.5 hPa (corresponds to 1.5 mbar /
15 mm WC).
If this value is exceeded, the heat output may be reduced
as a result of the hot air outlet temperature control.
The internal diameter of the main section of the hot air
line should be 60 mm.
When using narrower lines, the permissible pressure drop
is exceeded more quickly.
The hot air hose must be secured at its connection
points.
The heater can be used on the air inlet and outlet side if
it is used in an air circulation system with grates. Do not
short circuit the flow of hot air.