(06/03/2012) 110-01-M184EN
110
3
OPTIONS - ATTACHMENTS CHARACTERISTICS
AND SPECIFICATIONS
DESCRIPTION OF THE WORKING
The air conditioning system reduces the ambient temperature inside the vehicle cab, removing and
dispersing the heat from inside towards the outside.
This heat exchange is made possible by using a coolant R134a, the properties of which make it possible
to obtain very low temperatures at low pressure in expansion and the other way around, very high
temperatures at medium pressure, by means of the compression process.
The properties of the uid are used by following the cycle in a closed circuit the principle of which is:
Step 1: Compression
The uid, in gaseous state at low pressure and low temperature, is sucked in and compressed by the
compressor (Ref. 1) which sends it, at high pressure and high temperature, to the condenser.
Step 2: Condensation
The uid passes through the condenser (Ref. 2) to transmit its heat, by means of a fan, outside the vehicle.
When passing through the condenser, the uid is liqui ed, maintaining a high temperature and high
pressure. It is then ltered in a dehydrator (or drier) (Ref. 3).
Step 3: Release
The uid enters an expansion valve (Ref. 4) in which it is subjected to very great reduction of the pressure
and temperature, preserving the liquid state.
Step 4: Evaporation
The uid ows through the evaporator (Ref. 5) to absorb heat from the air in the cab and vapourizes
while at the same time maintaining a low pressure and temperature.
The air from the cab, pushed by the engine fan, cools and loses humidity in contact with the evaporator.
The condensate from the air is then drained and discharged outside the vehicle.
The high and low pressure circuit is controlled by means of a pressure switch HP and LP (Ref. 6) tted
directly on the drier lter.
Its safety functions are as follows:
Complete stop of the air conditioner if the pressure drops below 2 bar or exceeds 27 bar.
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