Operation and maintenance of the air-conditioning system
Air-conditioning process
The cooler is provided with a three-speed fan which aspirates the air from the cab interior thereafter forcing it across
the radiant block, thus making it cool down.
The heat exchange occurring between the gaseous coolant and the air lapping the walls of the cooler radiant block
results in air cooling.
The conditioned air undergoes a humidification process, as the low temperature inside the cooler causes a great deal
of condensate to deposit on the external walls of the cooler. This condensate is subsequently conveyed under liquid
state outside the cab through a special drainage system.
The coolant at the cooler exit is still under gaseous state and has a temperature of 5 to 10°C, in spite of the thermal
exchange that has taken place, and then it is aspirated by the compressor again.
How to operate the system
Before starting the air-conditioning system set the electric fan onto the desired speed. If the electric fan is switched
off, the conditioning system will not start.
The air-conditioning system is turned on by progressively rotating the control potentiometer clockwise, which is located
in the front top section of the cab compartment. Rotate it anticlockwise to turn the system off.
Warning: Before starting the engine, always make sure the air-conditioning system is switched off so that the battery
will not be overloaded.
When the air-conditioning system is operating, the pivotable air diffusers should never be completely closed.
To obtain a quick cab environment cooling the following is recommended:
— fully open the air recirculation grating and the pivotable air diffusers;
— turn first the fan control and then the potentiometer control all the way out;
— open the doors a few seconds so as to let the hot air out of the cab compartment if the tractor has stood under the
sun radiation for a long period;
— adjust the system according to personal preference when the desired temperature has been attained.
Checking the air-conditioning system charge
systems
air conditioning
System fully charged
(refrigerant entirely in liquid state)
System fully discharged
(refrigerant entirely in gaseous state)
System not fully charged
Refrigerant in part gaseous and part liquid state
Sight glass clear
Sight glass cloudy
(Bubbles or foam visible)
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365
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