Specifications

ADVR.010.00.00.000 RE. Sheet 5 of 26
4 Description of Heater Structure and Operation
The heater operates independently from the vehicle engine.
The fuel and electric power supply is provided by the vehicle. See Figure 4.1 for
the heater wiring diagram.
The heater is a self-contained heating device comprising the following:
- Heating device (See Figure 4.2 for basic components thereof);
- Fuel supply pump providing fuel for the combustion chamber;
- Ignition and indicator device (control unit);
- Wiring harness connecting heater fittings to the vehicle battery.
The heater’s operating principle is based on heating air driven through the vehicle’s
heat exchange system.
The heat source are fuel combustion gases from the combustion chamber. The
resulting heat warms the walls of the heat exchanger, which is air-blown from the
outside. Air passes through the ribbing of the heat exchanger and enters the passenger
compartment or other compartments of the vehicle.
Upon ignition, check the heater to ascertain whether fittings such as the flame
indicator, the overheat sensor, air pump motor, plugs, fuel supply pump and the electric
circuits thereof are working properly.
If no problem is detected, the ignition process starts.
In accordance with the preset sequence, the combustion chamber is fore-purged
and the heating plug warms up to the required temperature. Air and fuel starts to enter
the combustion chamber under the same procedure, whereupon the ignition process is
initiated. Once stable combustion is achieved, the heating plug switches off. Flame
control is provided by the flame indicator. All processes involved in heater operation
are monitored by the control unit.
The control unit controls heat exchanger temperature and halts the combustion
process as soon as the temperature exceeds the specified limit. The heater may be
switched off at any time.
Pressing the heater deactivation command stops the fuel entering and the
combustion chamber is purged with air.
During automated operation control of the heater in emergency situations, bear in
mind the following:
1) In the event of ignition failure, the process will be repeated. The heater will
switch off following two consecutive ignition failures,
2) If a combustion failure occurs while the heater is in operation, the heater will
switch off,
3) If the heat exchanger is overheated (maybe as a result of closure of the heater
inlet/outlet vents), the heater will switch off automatically,
4) If voltage drops below 10.5 V or exceeds 16 V the heater will switch off.
5) In the event of emergency shutdown, the indicator will show the information
according to the code of malfunction.(see table 7.1)
Flashing frequency corresponds to failure type, see Section 12 for details.