Webasto HL 90 Owner's Manual - page 25
HL 90
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 Air Heater
For any type of work on the heater the main power supply
cable is to be disconnected from the vehicle battery.
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. When performing long time repairs
on the heater its removal is considered appropriate.
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
Air Heater Test Run
WARNING
The heater must not be operated, not even with the timer,
in enclosed areas like garages or workshops not provided
with exhaust ventilation facilities.
8.5
Servicing
NOTE
In order to avoid seizure of mechanical components, the
air heater should be operated every 4 weeks for at least
20 minutes.
The heater does not require maintenance. It should
however be checked by Webasto-trained skilled
personnel in regular intervals, the latest before the heating
season begins (point of time, when the heater is more
frequently in use due to weather conditions).
To ensure functional reliability of the heater the following
servicing must be performed:
•
check combustion air inlet and exhaust outlet for
contamination (contaminated and clogged heating air
ducts may cause overheating and response of the
temperature limiter).
•
clean air heater exterior (prevent the ingress of water).
•
check clamps for security.
•
examine electrical connections for corrosion of
contacts and for security.
•
check combustion air and exhaust ducts for damage
and obstructions.
•
check fuel lines and fuel filter for leakage and
contamination.
•
replace fuel filter if installed.
8.6
Visual Inspections and Installation
Regulations
8.6.1 Heating Air System
CAUTION
The integration of the air heater into the vehicle's own air
system requires an accurate adaptation and is not
recommended.
The heater may be used for heating the passenger and
driver cabin in the fresh air mode of operation and for
load top compartments in the fresh air or circulation air
mode of operation. If an air heater is installed in a loading
compartment for circulation air mode of operation the
inside of the entrance door shall be labeled as follows:
"With heater on no personnel allowed in loading area with
door closed!"
Due to the danger of poisoning or suffocation the air
heating system air intake must be arranged in a way that
under normal operating conditions exhaust fumes from
the vehicle engine are unlikely to be sucked in, not even
when a downstream fan is in use, e.g. by drawing air from
the engine compartment.