AIR CONDITIONING OPTION-CHARACTERISTICS AND SPECIFICATIONS

WARNING

Only operators who are certified to handle refrigerant fluids may work on the air conditioning system, otherwise please contact a specialist air-conditioning company.

110.1.1 DESCRIPTION OF OPERATION

The air - conditioning system reduces the atmospheric pressure in the cab interior by extracting and dispersing the heat to the exterior. This heat exchange is possible thanks to theuse of a refrigerant fluid, R134a whose properties are to obtain very low temperature at low pressures by dilating it and inversely high temperatures at average pressure by compressing it.

The use of the properties of this fluid is done following the closed circuit cycle whose principle is:

PHASE 1: COMPRESSION

The fluid in the gaseous state at low pressure and at low temperature is drawn in and compressed by the compressor which sends it at high pressure and high temperature to the condenser.

PHASE 2: CONDENSATION

The fluid passes through the condenser to transmit its heat to the outside of the vehicle, by means of the fan. As it passes through the condenser the fluid liquifies while maintaining a high temperature and pressure. It is then filtered in a drier (or desiccator).

PHASE 3: EXPANSION

The fluid enters a pressure reducing valve (or expansion valve) so as to lower its pressure and temperature considerably while remaining in liquid state.

PHASE 4: EVAPORATION

The fluid passes through the evaporator to absorb the cab interior heat and vaporises while maintaining a low temperature and pressure. In this way, the cab interior air propelled by the fan motor cools and releases its moisture when in contact with the evaporator. The condensation of the air is then drained and evacuated to the outside of the vehicle.

The high and low pressures in the system are monitored by a HP and LP pressure switch attached directly on the drier filter.

It has the following safety functions:

Complete shut down of the air - conditioning system if the pressure is lower than 2 Bar or greater than 27 Bar.