KAMAZ 5490 Operation Manual page 223

Working in the «MEDIUM» mode the heater
warms the cooling liquid up to +60 °С and goes to the
«LOW» operating mode. After it heats the liquid up to
+70 °С it goes to the waiting mode, the combustion
chamber switches off, only the electric pump works. At
this mode the temperature of the cooling liquid drops
until +40 °С.
After the temperature +40 °С is reached the
control unit starts the heater and program № 2 is worked
out again.
4.10 The operation of the heater in item 4.9 can
differ from which is described above.
This difference can occur at very low minus
temperatures (-40 °С), when the engine and the cabin are
highly blown by the wind at temperatures -30 °С –
-40 °С or when the heater warms the premises of large
sizes. In those cases a great amount of heat will be
withdrawn into the ambient space.
The heater can work under program № 1 in the
«FULL» mode without reaching the set temperature of
the cooling liquid +70 °С. The heater will work in this
mode until the moment when the incoming heat exceeds
the outgoing heat. In this condition the rising of the
temperature of the cooling liquid starts and when the
temperature reaches +70 °С the heater will go to the
«MEDIUM» operating
temperature of the cooling liquid can drop up to the level
+65 °С. At this temperature the control unit will put the
heater in the «FUUL» operating mode. If the temperature
mode, in this case
of the cooling liquid keeps rising and the heater warms
the cooling liquid up to +75 °С the heater will go to the
«LOW» operating mode. If the temperature of the
cooling liquid keeps falling and reaches the level +70 °С
the control unit will put the heater into the «MEDIUM»
operating mode.
While working under program №2 the situation
different from the one described in item 4.9 may occur,
that is, the heater can work in the «MEDIUM» mode
without reaching the temperature +60 °С or after
reaching the temperature +60 °С and going to the
«LOW» mode the temperature of the cooling liquid will
keep falling until +55 °С. At this temperature the control
unit will put the work of the heater into the «MEDIUM»
mode.
the
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