KAMAZ 5490, Operation Manual

Page: 205 / 327

7
means that in both programs the coolant fluid is heated
up to 80 °C; in case of overheating more than 80 °C the
pre-heater is switched to the cooling-down mode. At the
same time combustion stops, the pump continues its
operation and the passenger compartment heating is
continued as well. When the temperature of the coolant
fluid gets below 55
° С the pre-heater automatically starts
either the full duty mode if the «nominal» program is
selected, or medium duty mode, if the «economic»
program is selected.
Duration of the total cycle is 3h («nominal»
program) or 8h («economic» program) and depends on
the position of the trigger on the control panel (refer to
Section 6). Moreover, there is a possibility to switch of
the pre-heater any time during the cycle.
When the pre-heater is switched off manually or
automatically, as preset time expires, the fuel supply
stops and the combustion chamber is purged with air.
Peculiarities of the pre-heater automatic control
under emergency conditions and in contingencies:
1) If the pre-heater has not started for some
reason, the starting process will be repeated
automatically. After two successive failed starts the pre-
heater is switched off;
2) If combustion stops when the pre-heater
operates, the pre-heater stops its operation;
3) in case of the pre-heater over-heating (for
example, abnormal coolant fluid circulation, air bloc,
etc.) it automatically switches off;
4) in case of voltage drop lower than 20 V or
voltage surge higher than 30 V, the pre-heater switches
off;
5) in case of the pre-heater emergency shut-down,
a corresponding LED starts blinking on the control panel.
Certain blinking indicates type of malfunction. Refer to
User Manual Section 8 for interpretation of
malfunctions.
Note. Heating of the passenger compartment is
possible only with the passenger compartment heater
cock in open position and frame connection available.