Webasto Air Top Evo 3900 Workshop Manual page 10

1 Introduction
Overheating
Keep the hot air inlet and hot air outlet free of dirt and
foreign bodies. Dirty, blocked air lines can cause the
heater to shut down due to overheating.
After an overheating lock-out, check that the air system is
clear, remove any materials that may block the air current
and have any damage to the air lines repaired by an
authorised Webasto workshop. After this the heater
lockout can be cancelled by switching it off and then on
again.If this action does not produce the required success
(if the heater overheats again) take it to an Webasto-
authorised workshop.
The air outlet jets or air vents with adjustable flaps must
always be opened to some extent so that the air current
through the heater is not completely blocked.At least one
air vent must be non-closable.
If the heater is installed in a storage area, you must
ensure that no inflammable substances are kept in this
area and that other material does not restrict the air supply
to the heater.
Air lines must be securely fixed to the heater (using pipe
clips, for example) and all other connection points (for
example vents).
IMPORTANT
The errors described below are to be avoided at all costs:
• Do not stand on the heater and do not place any
heavy items on the heater or throw items at the heater.
• Do not place any items of clothing, textiles or similar
materials over the heater or in front of the hot air inlet
and the hot air outlet.
• The current of hot air in the heater must not be
restricted or blocked by highly inflammable
substances or materials such as rags, cleaning wool,
etc.
• Inflammable or explosive substances and gases must
not be placed near or in contact with the heater, the
hot air line, the current of hot air or the exhaust pipe.
• The heater must not be cleaned with a high pressure
cleaner.
• Do not switch the heater off at the main battery switch
or battery isolation switch since otherwise it is
possible that it may suffer long term damage if it is
switched off frequently using the battery isolation
switch and this can cause damage and negative
influences on the function of the heater.
104
Air Top Evo 3900/5500
Failure to follow the installation instructions and the notes
contained therein will lead to all liability being refused by
Webasto. The same applies if repairs are carried out
incorrectly or with the use of parts other than genuine
spare parts. This will result in the invalidation of the type
approval for the heater and therefore of its homologation /
EC type licence.
You must read the operating manual before starting the
heater for the first time.
NOTE