Checking system
Check belt tension: under finger pressure applied to the mid point between the two pulleys, belt should not deflect
more than 8 to 10 mm maximally.
Always keep condenser fins duly clean.
Cleaning should be carried out by a water or air jet (be careful not to bend the fins, use the special combing tool to
straighten them again).
Ascertain the compressor is firmly secured to tractor and the pulleys are properly aligned.
Warning: When removing the strainer or the air-conditioning unit it is required to plug the inlet and the outlet pipes at
once, this is to prevent both dust and moisture from entering.
Even a few minutes’ exposure to the environmental humidity makes it necessary to replace the filter.
System safety elements
Minimum pressure switch (7 Fig. 1).
Switches the system off when a failure causes the pressure to drop below 2 bar within the high pressure circuit.
Maximum pressure switch (9 Fig. 1).
Switches the system off when pressure exceeds 27 bar inside the circuit as a result of an excessive setting or a failure
(high pressure area).
Condenser fan control pressure switch (8 Fig. 1).
Switches the condenser fan on when coolant attains the same pressure of the switch setting pressure.
Note: The above three safety devices are grouped inside the thermostatic bulb located on the dehydrator filter.
Temperature regulation
Temperature regulation is obtained through the potentiometer, which automatically regulates the temperature of the
air flow from the radiator according to the environmental temperature, through a combined action with the fan.
A pressure switch located on the electric circuit opens and closes the electric circuit of the compressor electromagnetic
coupling as a consequence of the potentiometer operation. When the circuit is open the pulley will be idling, on the
other hand, when the circuit is closed, this will operate integrally with the compressor shaft.
systems
air conditioning
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