(06/03/2012)
110-01-M184EN
110
5
OPTIONS - ATTACHMENTS CHARACTERISTICS
AND SPECIFICATIONS
DESCRIPTION OF THE COMPONENTS
The compressor
The compressor (Ref. 1) is the organ which makes it possible to:
•
convey the fl uid through the suction circuit, in a gaseous state, from the evaporator at low pressure
and low temperature.
•
compress the fl uid and transmit it at high pressure and temperature to the condenser.
The condenser
The condenser (Ref. 2) is a heat exchanger which transmits the heat recovered by the evaporator by
means of the fan to the outside and causes condensation of the fl uid at high pressure.
The receiver (or drier) fi lter
The fi lter (Ref. 3) is the main protective element of the system. Its functions are as follows:
•
To fi lter out solid particles, if any, carried by the fl uid, as they could damage the compressor or block
the regulator.
•
Dehumidify the fl uid oil and protect the circuit elements from:
corrosive agents,
freezing of the moisture at the regulator outlet to prevent blocking of the system.
•
Keep the fl uid in the liquid state thereby forming a buff er tank to compensate for pressure variations,
if any. It thus contributes to absorbing pressure variation that may be generated by the compressor.
The “binary” pressure switch
(Ref. 6)
Connected to the receiver fi lter, it is the safety element of the plant, and is sensitive to pressure variations.
It ensures safety of the system against very low pressure values or very high pressure values by acting
directly on the compressor clutch:
•
Action against low pressures (<2 bar) because of lack of coolant, a leak or a block in the circuit downline.
•
Action against high pressures (> 27 bar) because of incorrect cooling of the condenser, excess coolant
or a block in the circuit upline.
The expansion valve
The expansion valve (Ref. 4) is connected to the evaporator inlet.
•
Expansion causes the pressure and temperature of the fluid to fall, thus cooling the air passing
through the evaporator.
•
The fl ow is regulated in such a manner as to calibrate the amount of fl uid to make sure it is completely
vapourized on coming out of the evaporator.
The evaporator
The evaporator (Ref. 5) is a heat exchanger provided with a valve and a fan.
The fan sucks in air (cold) through the evporator, the moisture in the air condenses on the evaporator
fi ns, cools the air and pushes it out.
This heat exchange allows the coolant to evaporate at low pressure.
The antifreeze thermostat
The electric thermostat is connected to a probe fi tted between two fi ns of the evaporator.
A temperature variation of the evaporator causes a variation in the resistance of the setting of the
thermostat which acts on the compressor clutch relay.
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...
