HL 90
2 General Description
201
2 General Description
The air heater HL90 is used to
– heat the driver compartment and the vehicle interior/
passenger compartment
– defrost the windscreen
– heat vehicle loading compartments
The heaters are cleared for heating the passenger
compartment and the driver compartment in the fresh air
mode of operation of and vehicle loading compartments
in the fresh air or circulation air mode of operation. The
heating of loading compartments for dangerous goods is
not permitted.
The heater operates independent from the vehicle engine
and is connected to the vehicle's electrical system and
fuel system.
The heaters may be operated in vehicles with water or
air-cooled engines.
The heater designed to the rotation atomiser principle
operates intermittently controlled by the temperature
sensor.
The heater HL90 basically consists of the:
–drive
– heat exchanger
For control and monitoring the heater includes a:
– control unit
– flame sensor
– glow plug
– temperature limiter
Fuel supply is provided externally by a fuel dosing pump.
2.1 Drive
The drive provides for fuel supply with atomisation and
combustion air supply to the combustion chamber in the
heat exchanger.
The drive basically consists of the air intake housing with
fuel and combustion air connection, the bypass fan and
the atomiser.
The motor is flanged to the air intake housing driving the
bypass fan and the atomiser via a clutch. The motor also
drives a rotor to suck in fresh air or circulation air across
an orifice plate.
Resistors for the glow plug and the motor are also
mounted to the air intake housing.
2.2 Heat Exchanger
The heat exchanger transfers the heat generated by
combustion to the heating air circulated by the fan.
2.3 Control Unit
The control unit ensures controlled operation and
monitoring of combustion.
SG 1561 GK
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