Mercedes S-Class W-220

since 1998 of release

Repair and car operation

W220 Mercedes
+ Mercedes-Benz Cars of a class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling and heating systems
   + cooling System
   - Systems of ventilation, heating and air conditioning
      Air central air - the general information and precautionary measures
      Arrangement of the basic electric elements of central air of air
+ Power supply system and release
+ engine Electric equipment
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Cхемы

Systems of ventilation, heating and air conditioning

General information and security measures

Function chart of the refrigerator of the conditioner of air


1 — the To/in Compressor 2 — the Condenser 3 — the Receiver dehumidifier 4 — the Broad valve 5 — the Evaporator 6 — the Evaporator of the back conditioner of air 7 — the Valve of shutdown of a coolant of the back conditioner of air	8 — the Valve of injection of a coolant of the back conditioner of air And — the High pressure (a gaseous phase) In — the High pressure (a liquid phase) With — Low pressure (a liquid phase) D — Low pressure (a gaseous phase)

Additional heater. Diesel models


1 — the Control unit of the module of heatreturn 2 — the torch Case 3 — the Exit of cooling liquid 4 — the Module of a purge of air of burning 5 — Supply of air of burning 6 — the Socket 7 — the heatreturn Module 8 — the Torch	9 — an exhaust Exit 10 — Supply of cooling liquid 11 — Supply of fuel A6m2 — the Purge of air of burning A6n1 — the Control unit additional heater A6r2 — the Heater

Ventilating streams

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.

The used air is removed from salon through ventilating openings with return valves.

The increase in a consumption of air via the heat exchanger provides the fan of fresh air.

If it is necessary to disconnect supply of fresh air, for example, at a bad smell, the system is switched in a circulation mode at which in salon air available there circulates only.

System switching in a mode of circulation proves to be true fire of a control lamp.

Central air of air of salon

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 a heater and the refrigerator. The KV refrigerator 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 30 atm. 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.

Additional heater

The additional heater on fuel is established on model with diesel engines. At engine start it automatically starts to work depending on temperatures of cooling liquid and environment. Manual control is not provided. It can be included or switched off only the switch on the central console.

Besides a heater on fuel also additional electric heater is established.