Other Features
112
WARNING
The coolant heating system uses the same
fuel as the engine. Do not operate in a closed
building or while refueling. Operate only in a
well ventilated area.
SWITCHING THE HEATER ON
The timer light illuminates when the heater is
switched
ON
. Air is forced in to flush out the
combustion chamber of residual gases and the
water circulation pump begins operating. The
fuel metering pump delivers fuel in precise
amounts to the combustion chamber, where fuel
and combustion air form a combustible mixture
which is ignited by the ignition unit.
Once the flame sensor has signaled to the
control unit that combustion has taken place, the
ignition unit is switched
OFF.
The dashboard
telltale light will illuminate to indicate when the
burner is
ON.
Hot combustion gases are diverted at the end of
the flame pipe and are then forced through the
indirect heating surfaces of the heat exchanger.
The heat exchanger transfers the heat to the
coolant water passing through the heat
exchanger.
LOCATION OF PREHEATER
18607
The heater is thermostatically controlled and
operates intermittently (i.e., the switched-on time
of the burner varies depending on the heat
requirement). The water temperature is
controlled by the built-in water thermostat.
The water circulation pump remains in operation
as long as the heater is operating, even during
the regulated intervals and during the delayed
cut-out of the heater. The pump can also be
operated independently of the heater by means
of an appropriate circuit. The heater can be
switched
ON
at any time (i.e., during the delayed
cut-out period). Ignition takes place after the
delayed cut-out time expires.
SWITCHING THE HEATER OFF
The fuel supply is interrupted when the heater is
switched
OFF
. This causes the flame to go out
and a delayed cut-out of 2.5 minutes begins.
The circulating combustion air flushes the
remaining combustion gases out of the chamber
and cools off the heated parts on the exhaust
side of the heat exchanger. The water
circulation pump continues to transfer the latent
heat present in the heat exchanger, thus
preventing hot spots. Once the delayed cut-out
time expires, both the combustion air blower and
the water circulation pump switch
OFF
automatically. A cut-out will automatically take
place in case of heater failure. Refer to
Technical Information chapter for additional
information.
COOLANT HEATER TIMER
The timer, located on L.H. lateral console is
used to program the starting and stopping time
of the preheating system and to give Fault
Codes. The system indicator light, located on
the timer, illuminates when the system is
functional.
CAUTION
The preheating system should not operate for
more than one hour before starting engine as
this could discharge batteries.
WARNING
Preheating system must not operate when
vehicle is parked inside or during fuel fill
stops.
NOTE
Preheating system uses the same fuel as the
engine.
Summary of Contents for X3-45 2011
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