Technical data

HL 90
35
5 Hot air system
Integrating the heater into an existing air system belonging to the vehicle re-
quires careful harmonisation and is not recommended.
The air heater can be used both in fresh air mode for heating a passenger
compartment and a driver’s cab as well as in recirculated air/fresh air mode
for vehicle bodies. If the air heater is installed in a vehicle body for use in re-
circulated air mode, a sticker with the following content must be affixed to
the inside of the entrance door:
“No-one is allowed to remain in the enclosed loadspace when the heater is
switched on!”
Due to the risk of poisoning and suffocation, the intake opening for the hot
air system must be arranged so that exhaust gases from the vehicle’s engine
and the heater itself cannot be sucked in under normal operating conditions.
This also applies even if a blower is used on the heater output side, e.g. by
sucking in air from the engine compartment.
The intake temperature of the heating air must not exceed +30 °C.
Minimum internal diameter of the hot air line:
100 mm
Maximum air pressure differential between the intake and outlet side of the
hot air line:
2.5 mbar (25 mm water column)
If these values are exceeded the temperature limiter will trip.
The hot air hose must be secured at its connection points.
When used in recirculated air mode, measures must be taken to prevent the
heater sucking in its own heated air.
HL90 EA_de_en_fr.book Page 35 Wednesday, June 5, 2013 10:17 AM