Mercedes S-Class W-140
1991-1999 of release
Repair and car operation
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
- Systems of cooling, heating
+ System of cooling of the engine
- Systems of ventilation, heating and air conditioning
Casing of the fan and ventilyatorny assembly - installation details (on an example of petrol model with the M120.980/982 series engine)
Air central air - additional information and precautionary measures
Arrangement of basic elements of automatic central air of air
+ Power supply system and release
+ engine Electric equipment
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Systems of ventilation, heating and air conditioning
The air submitted by system of ventilation to salon of the car through the filter, can be warmed up or cooled depending on a choice of the driver and passengers. The heater or the conditioner settle down in salon, in the case under the dashboard. All stream of air submitted to salon goes for heating or cooling through the same casing. The temperature and speed of a stream of air is regulated by means of governing bodies located on the control panel.
Heat allocated at operation of the engine, is transferred by cooling liquid to the radiator of a heater located in salon. The brought stream of air from system of ventilation passes through a radiator and heats up heat of cooling liquid of the engine proceeding in a radiator. Extent of heating is regulated by means of mixing in a certain ratio of cold and hot air by means of a mixing zaslonka with the servo-driver.
Central air of air of salon
Functional schemes of typical central air of air
Working path of a forward contour of To/in system
Working path of a back contour of To/in system
Works with central air should be carried out by a specialized workshop. At all do not open a contour of circulation of a coolant as at contact with skin the coolant can cause frostbite.
By means of central air air temperature in salon can go down below external temperature.
At system work humidity in salon decreases. In the crude weather, arriving fresh air previously it is cooled, then again heats up to the set temperature. Thus its drainage is made. By means of this procedure the zapotevaniye of glasses is removed.
Central air consists of the compressor, the condenser, a throttle, the evaporator, capacity with a coolant and pipelines. In system the coolant (R134á type) which depending on temperature and pressure can be in a liquid or gaseous state circulates.
The conditioner compressor through a ridge belt is given in rotation from a cranked shaft of the engine. He creates pressure to the 30th bar in a contour of cooling of installation owing to what the coolant representing gas, heats up. In the condenser the coolant is cooled with air proceeding outside (cooling air remains in environment). Thereof the warmed-up coolant is condensed, turning into liquid. Having big pressure, it is passed through a throttle therefore its pressure falls. After that the coolant evaporates in a contour, at the same time strongly being cooled. In the evaporator the coolant selects heat from air blown through it. Thereof air is cooled. The cooled air arrives in car salon. As a result of heating in the evaporator the coolant turns into gas and under low pressure arrives in the compressor then process of circulation repeats.
Security measures at service of the air conditionerCentral air should be served by exclusively prepared technicians trained in safe working methods with use of the appropriate equipment with observance of rules of depressurization, acquainted with receptions of collecting and order of storage of an automobile coolant.