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– a control unit connected to the<br />
heater/ventilation unit for automatic<br />
operation;<br />
– an electronic control unit to check<br />
and adjusted the integrated heater<br />
burner;<br />
– a digital timer A-fig. 85 to start the<br />
heater manually or to program staring<br />
time.<br />
fig. 85<br />
F0D0165m<br />
60 GETTING TO KNOW YOUR VEHICLE<br />
In cold weather, the supplementary<br />
heater automatically warms and circulates<br />
constant temperature fluid in<br />
the engine cooling system for the time<br />
required to ensure optimal engine ignition<br />
and cab temperature conditions.<br />
The heater can be started automatically<br />
(programmed by means of the<br />
digital timer) or manually by pressing<br />
the “heat now” button on the timer.<br />
When the heater is turned on (automatically<br />
or manually), the electronic<br />
control unit operates the fluid circulation<br />
pump and safely ignites the burner.<br />
The electronic control unit also controls<br />
the circulation pump delivery in<br />
order to reduce initial heating time.<br />
When the fluid reaches a temperature<br />
of 30°C, the control unit operates the<br />
passenger compartment ventilation<br />
fan.<br />
When the fluid temperature reaches<br />
72°C, the electronic control unit reduces<br />
the burner power and stops operation<br />
when it reaches 76.5°C. The<br />
timer, circulation pump and heater fan<br />
are kept running. When the fluid temperature<br />
drops under 71°C the control<br />
unit automatically turns the burner<br />
back on.
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