OTHER FEATURES
COOLANT HEATER COMPARTMENT 22203
SWITCHING THE HEATER ON
The pilot 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
glow ignition unit is switched OFF.
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.
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. One of three possible timers
may be installed in your vehicle (refer to the
three following images). 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.
Timer Operating Instructions (Espar)
ESPAR 22142
These Instructions refer to the ESPAR timer
illustrated above.
1. Time
2. Program
3. Heating ON
4. Backwards
5. Forwards
6. Memory indicator
65
To Next Page
Loading...
