KAMAZ 5490 Operation Manual page 222

controlled by the control unit with the help of the flame
indicator. When steady burning and the sufficient signal
from the flame indicator are reached the control unit
turns off the glow plug and the further process of burning
is supported by permanent fuel and air supply into the
combustion chamber.
Working under program № 1 the control unit puts
the operation of the heater into «FULL» mode and under
program № 2 – into «MEDIUM» mode.
4.8.1 If for any reason the startup of the heater
doesn't occur the process of the starting up the heater is
automatically repeated. After two feeble attempts to start
up the heater it is automatically switched off. On the
control panel the red light emitting diode starts flickering
with intervals and the signal sounds, which shows that
the startup attempts are exhausted «code № 2».
At this time the control unit carries out blowing of
the combustion chamber for five minutes. Such blowing
is carried out when any malfunction of the heater occurs.
After the blowing is finished the electric pump switches
off. The malfunction code flickers and beeps for ten
minutes.
The malfunction code can be stopped with the
button of the respective program by pushing it and
holding it in that position for five seconds.
4.9 When the button position 2 is pressed the
heater will work under program № 1 which provides a
quick preparation (heating) of the motor for starting up,
that is, the heater reaches the «FULL» mode and in this
mode heats the liquid up to the temperature +70 °С.
Then it goes to the «MEDIUM» mode and brings the
temperature of the cooling liquid up to +75 °С, after that
it goes to the «LOW» mode and continues heating the
liquid to the temperature +80 °С. After the temperature
+80 °С is reached the heater goes to the waiting mode,
that is, the combustion chamber switches off and the
electric pump continues working.
The «waiting» mode extends until the temperature
of the cooling liquid drops up the level +55 °С. At this
temperature the control unit starts up the heater and
works out program № 1 again.
The heater can be switched off at any moment of
its operation by a repeat pushing of the button position 2.
The work of the heater can be moved to program № 2 by
pushing the button position 3.
Working under program № 2 the control unit
measures the temperature of the heater's incoming
liquid. When the temperature +40 °С is reached it turns
on the cabin heater fan, which starts heating the cabin air
and keeping the air temperature set on the control panel.
The control unit together with the control panel
automatically keep the set temperature in the cabin. The
temperature in the motor vehicle cabin is measured by a
remote heat sensor that must be located in the place
where the set temperature is to be kept. In the process the
heat sensor must be well blown by air. The temperature
adjustment is carried out by switching on and off the
cabin heater fan.
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