Fiat Ducato 2021, Owner'S Handbook Manual

Page: 60 / 368

KNOWING YOUR VEHICLE
58
IMPORTANT
3) The air conditioning system uses R134a
or R1234yf refrigerant compatible with the
regulations in force in the countries where
the vehicle is sold. When charging, only
use the gas indicated on the dedicated
plate in the engine compartment . The
use of other coolants affects the efficiency
and condition of the system. The lubricant
used for the compressor is also strictly
linked to the type of cooling gas, please
refer to a Fiat Dealership.
ADDITIONAL
HEATER
(for versions/markets, where provided)
On some versions, an additional heater
is also present beneath the driver's
seat. The fan for this heater is operated
by means of the button (E) located on
the control panel fig. 104.
104
F1A0693
INDEPENDENT
ADDITIONAL
HEATER
(for versions/markets, where provided)
The vehicle is available, on request,
with two different independent heaters:
one fully automatic, the other which
can be programmed.
AUTOMATIC VERSION
The additional heater is turned on in
automatic mode when the engine
is started and the required outside
temperature and coolant conditions
are present. Deactivation is always
automatic.
39)
WARNING During periods with low
outdoor temperatures when the device
cuts in, check that the fuel level is
always higher than the reserve level.
Otherwise the device could lock
and require the assistance of a Fiat
Dealership.
PROGRAMMABLE
VERSION
The additional heater is located on the
roof or in the glove compartment of the
cab, where provided. It is completely
independent of the operation of the
engine for:
heating the passenger compartment
with the engine off;
defrosting the windows;
heating the engine coolant and then
the engine itself prior to starting.
The system consists of:
a diesel burner for heating the
water with an exhaust silencer for the
combustion gases;
a metering pump connected to the
reservoir pipes for supplying the burner;
a heat exchanger connected to the
engine cooling system pipes;
a control unit connected to
the passenger compartment
heating/ventilation system to allow
automatic operation;
an electronic control unit for
controlling and adjusting the built-in
burner;
a digital timer fig. 105 for turning the
heater on manually or for programming
the time it comes on.
The additional heater (during winter)
heats, maintains the temperature of
and circulates engine coolant for a set
time period in order to ensure optimum
engine and passenger compartment
conditions at engine start-up.
The heater can operate automatically
when programmed with a digital timer
or manually by pressing the 'immediate
heating' button on the timer.