System of automatic ventilation, heating and air conditioning (HVAC). BMW the 7th E38 series (from 1994 to 2002 release)
 
BMW 7_aya the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and methods of operation
2.1. Access, protection
2.2. Elements of security systems
2.3. Car equipment, arrangement of devices and governing bodies
2.4. Devices of ensuring comfort
2.4.1. Multipurpose display
2.4.2. System of automatic ventilation, heating and air conditioning (HVAC)
2.4.3. Tempostat
2.4.4. Audio system and mobile phone
2.5. Methods of operation and auxiliary systems
3. Settings and routine maintenance of the car
4. Engine
5. Cooling systems of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Cardan and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Schemes of electric equipment



2-4-2-sistema-avtomaticheskojj-ventilyacii-otopleniya-i-kondicionirovaniya-vozdukha-hvac.html

2.4.2. System of automatic ventilation, heating and air conditioning (HVAC)

General information

On the considered cars the HVAC system with a possibility of automatic control is installed.

Air gets through a lattice of a fairing of a windshield and gets to salon, passing through the filter and if the heater, through its radiator is included. You hold a lattice of a fairing of a windshield pure from leaves and other garbage, and also periodically replace the saloon filter to achieve from system of ventilation of the maximum return.

Deflectors are intended for adjustment of the direction of air streams in salon (two side, two the central lobbies and two central back). Between the central deflectors the regulator of air temperature, arriving from them is in addition installed. At the closed back deflectors air moves only via forward deflectors. At the closed forward deflectors air moves on having blown in a windshield.

To/in works only at the working engine and at a temperature of air above 5 °C. On some models

General view of the control unit of the HVAC system

1 — air Streams for an obduv wind and side glasses
2 — air Streams to the person
3 — air Streams to legs
4 — the Switch of automatic distribution of air in the left part of salon
5 — Switches of a certain distribution of air in the left part of salon
6 — the Key of adjustment of temperature in the left part of salon
7 — the Display of temperature and intensity of an air stream in the left and right parts of salon
8 — the Key of adjustment of temperature in the right part of salon
9 — the Switch of the modes of cooling and use of residual heat of the engine

10 — Switches of a certain distribution of air in the right part of salon
11 — Switches of automatic distribution of air in the right part of salon
12 — the Key of adjustment of intensity of an air stream in the right part of salon
13 — the Switch of the automatic mode of air circulation (AUC)
14 — the K/V Switch
15 — the Switch of heating of back glass
16 — the Switch of an obduv of glasses
17 — temperature sensor Lattice in salon
18 — the Key of adjustment of intensity of an air stream in the right part of salon

Independent system of ventilation

This system uses the HVAC system fan for ventilation of salon and decrease in temperature in salon when the car is parked. Control of independent system of ventilation is exercised by means of the multipurpose display (see the Section of the Device of ensuring comfort).

Avoid inclusion of independent system of ventilation twice until the car is parked that the rechargeable battery was not discharged.

Switch of heating of back glass

The switch is equipped with the built-in light indicator of inclusion of heating. Include heating for removal of condensate and hoarfrost from back glass. Heating is switched off automatically through certain time after its inclusion, however if the desirable result is achieved before this time, switch off heating manually. While the indicator in the switch burns, heating works with the maximum power, and after switching off of the indicator some time before automatic switching off of heating it works with the underestimated power.

It is necessary to include heating of back glass at the working engine for the purpose of prevention of the category of the rechargeable battery.

Optimum settings of system

It is recommended to use automatic control mode the HVAC system. For this purpose press the AUTO button (The General view of the control unit of the HVAC system), choose the required temperature (22 °C are recommended) and direct an air stream from the central deflectors so that it blew sitting on seats, but did not get directly on them. Below use of manual adjustments of the HVAC system is described.

For the choice of one of certain modes of air supply (to the person, to legs or on having blown in glasses) press the corresponding switch (The General view of the control unit of the HVAC system). At the same time the automatic mode is switched off.

For bystry removal from glasses of hoarfrost and condensate press the switch of an obduv of glasses (The General view of the control unit of the HVAC system).

For inclusion/switching off To/in press the corresponding switch (The General view of the control unit of the HVAC system). At working To/in the air coming to salon it is cooled and drained. It accelerates removal of condensate from glasses at high humidity of air.

The moisture which is taken away from air during the work To/in is condensed and goes down from under the car therefore existence of a pool under the car after its parking with included To/in – the normal phenomenon. For receiving the maximum return at its use close windows and the top hatch from the K/V system.

For the maximum cooling of the air given to salon press the corresponding switch (The General view of the control unit of the HVAC system) when the key in the lock of ignition is in situation, since "1". If to press this switch when the key is in situation "0", mode of use of residual heat of the engine joins. This mode is available only at the switched-off heated-up engine when the rechargeable battery has a sufficient charge, and external temperature makes less than 15 °C.

By consecutive pressing of the switch of the automatic mode of air circulation it is possible to switch between the automatic mode (mode of circulation joins and switched off automatically, depending on quality of external air, at the same time the indicator on the left side of the switch burns), forced ventilation mode (external air constantly comes to salon, at the same time indicators do not burn) and the recirculation mode (external air in salon does not move, at the same time the indicator on the right side of the switch burns).

At a complete set to be switched by a multipurpose steering wheel between the automatic mode and the mode of forced ventilation by means of the switch located on it.

The mode of circulation should be used when driving on dusty roads or in a dense stream not to allow hit in salon of dust, unpleasant smells and the fulfilled gases. Besides, mode of circulation allows to accelerate considerably decrease in temperature in salon when using К/В.

Do not include the air circulation mode for long time since at the same time air in interior of the car becomes stuffy, and at windows condensate appears.

By means of switches of temperature and intensity of air supply separately for the left and right parts of salon, in them it is possible to establish various temperature and intensity of air supply. These parameters are displayed on the display (The General view of the control unit of the HVAC system). When pressing the button of reduction of intensity of an air stream at its minimum value the fan, heater and To/in are switched-off and the circulation mode is chosen. For return to the normal mode of functioning of the HVAC system press any button on the block of its management.

The K/V system in a back part of salon

At the corresponding complete set in a back part of the central console the control unit of the K/V system of a back part of salon is installed.

The HVAC control unit in a back part of salon

1 — the Display of values of temperature and intensity of air supply
2 — the Regulator the system temperature/switch
3 — the Regulator of intensity of giving the system air/switch


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2.4.1. Multipurpose display
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2.4.3. Tempostat