(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 fl uid are used by following the cycle in a closed circuit the principle of which is:
Step 1: Compression
The fl 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 fl 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 fl uid is liquifi ed, maintaining a high temperature and high
pressure. It is then fi ltered in a dehydrator (or drier) (Ref. 3).
Step 3: Release
The fl 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 fl uid fl 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) fi tted
directly on the drier fi lter.
Its safety functions are as follows:
Complete stop of the air conditioner if the pressure drops below 2 bar or exceeds 27 bar.
Summary of Contents for MHT 10225
Page 4: ...GENERAL INSTRUCTIONS AND SAFETY NOTICE GENERAL CONTROL AND ADJUSTMENT GENERAL 00...
Page 5: ......
Page 12: ...00 04 M184EN GENERAL CONTROL AND ADJUSTMENT pages STANDARD TIGHTENING TORQUES 2 05 06 2012 00...
Page 15: ......
Page 16: ...05 06 2012 10 03 M184EN 10 ENGINE COMPONENTS LOCATION page MERCEDES ENGINE 2...
Page 19: ...05 06 2012 10 03 M184EN 10 4 ENGINE COMPONENTS LOCATION...
Page 47: ...05 06 2012 10 06 M184EN 10 26 ENGINE REMOVAL...
Page 73: ......
Page 79: ...06 03 2012 110 01 M184EN 110 6 OPTIONS ATTACHMENTS CHARACTERISTICS AND SPECIFICATIONS...
Page 81: ...07 03 2012 110 03 M184EN 110 2 OPTIONS ATTACHMENTS COMPONENTS LOCATION...
Page 89: ...110 07 03 2012 110 03 M184EN 10 OPTIONS ATTACHMENTS COMPONENTS LOCATION...
Page 101: ......
Page 103: ...06 06 2012 20 02 M184EN 20 2 TRANSMISSION SCHEMATIC DIAGRAMS...
