Fiat Ducato Owner's Handbook Manual page 54

fig. 45
❒ control unit connected to the
heater/ventilation unit for automatic
operation;
❒ electronic control unit to check and
adjusted the integrated heater burner;
❒ digital timer A-fig. 45 to start the
heater manually or to program staring
time.
In cold weather, the supplementary heater
warms and circulates constant tempera-
ture fluid in the engine cooling system for
the time required to ensure optimal en-
gine ignition and passenger compartment
temperature conditions.
The heater can be started automatically
(programmed by means of the digital
timer) or manually by pressing the "heat
now" button on the timer.
F0N0150m
When the heater is turned on (automat-
ically or manually), the electronic control
unit operates the fluid circulation pump
and safely ignites the burner according to
preset and controlled modes.
The electronic control unit also controls
the circulation pump delivery in order to
reduce initial heating time. When the sys-
tem is operating, the control unit operates
the heater unit fan to the second speed.
Thermal power is adjusted automatically
by the control unit according to the en-
gine coolant temperature.
53