Basic scheme and components of ATC system

• Basic scheme of ATC system
• Functions and checking of components

External air thermode

Location:

In the centre of the back side of front bumper.

Functions:

Consists of thermistor (resistance NTC): reacts to external air temperature, to the controller delivers the transformed pressure whose value varies depending on changing the size of thermistor resistance.

Way of checking:

After detachment of the external air thermode socket, after having connected the measuring instrument of resistance to plugs V12 and À10 of the thermode there are measured the value of resistance (at temperature of external air 25°C, value of resistance - 2,186 kOm).

Internal air thermode

Location:

Inside the gauge of audioequipment remote control.

Functions:

Consists of thermistor (resistance NTC); reacting to temperature of the interior air which arrived through suction aperture of the controller gauge, the transformed pressure whose value varies depending on changing the value of thermistor resistance.

Checking:

Prior to the beginning of realization of checking the internal air gauge, first of all, through leading of the cigarette smoke to the suction aperture of the automobile saloon they check whether internal air (start of air-blower to the speed above "LO") is sucked.

After detachment of the external air thermode socket, after having connected the measuring instrument of resistance to plugs V12 and À10 of the thermode there are measured the value of resistance (at temperature of external air 25°Ñ, value of resistance - 2,186 kOm.

See the diagram of dependence of resistance on temperature in the previous paragraph.

Water thermode

Location:

On the side of entrance aperture of the heater A hose.

Function:

Consists of thermistor (resistance NTC); reacts to temperature of cooling liquid of the engine, to the controller the transformed pressure whose value varies depending on changing the value of thermistor resistance. At temperature of cooling liquid of the engine up to 50°Ñ and the choice of heating mode so that the big stream of cold air did not move into the bottom part of the saloon, they transfer the air blower to the speed "LO".

Checking:

After detachment of the external air thermode socket, after having connected the measuring instrument of resistance to plugs B13 and À10 of the thermode there are measured the value of resistance (at temperature of external air 80°Ñ, value of resistance - 0,3673186 kOm).

See the diagram of dependence of resistance on temperature in the previous paragraph.

Solar gauge

Location:

On the site of lattices of exit nipple.

Function:

On the controller the current which is turning out with the help of the photodiode by transformation of sun rays (light exposure), penetrating through all glasses into the automobile saloon.

Diagram of dependence of photostream on the doze of solar energy

Checking:

They measure the current through having connected to the solar gauge wires. (At a doze of a solar energy of 600 Kcal / HR·m² value of the current — 0,4 mA).

Electric motor of air mixing flap

Location:

The right side of the heater (À) back case.

Function:

The electric motor is connected to the air mixing flap with the lever, and at starting of the electric motor of the flap opening, and to the controller the transformed pressure of the feedback whose value varies from a degree of opening of air mixing flap is delivered.

Checking:

After the detachment of the socket of electric motor of air mixing flap, after having connected the measuring instrument of resistance to plugs "À5" and "A11" PBR, , they measure the value of resistance. At opening of the electric motor of air mixing flaps on 40°C, the value of resistance PBR is 5,48 kOm.

Diagram of dependence of electric motor resistance on temperature

Vacuum solenoid-operated valve

Location:

Base plate in a box for gloves.

Function:

5 In electromagnetic valves on signals of the switch of exhaust outlets modes and the switch of choice of suction aperture (REC, FRE) they actuate with vacuum all operating mechanisms of modes.

Mode control / executing mechanisms 1 – air stream to the glass 2 – increased speed of the fan 3 – air stream to the floor 4 – low speed of the fan 5 – air recirculation

Modes of air stream - to the glass (heater maximum efficiency)

Upwards to the front (position of maximum cooling) switch FRE/REC is switched - off)

Upwards to the front (position of maximum cooling) switch FRE/REC is switched - on)

To the floor ((position of maximum cooling) switch FRE/REC is switched - off)

Separation of streams (mixing of hot and cold streams) switch FRE/REC is switched - off

Air blower relay

Location:

Relay box of under-bonnet space.

Function:

Switches the speed of the air blower electric motor to 1 stage (LO), 2 stage (ML), 3 stage (ÌÍ), 4 stage (HI) depending on the air stream determined by the circuit of a drive of the controller air blower.

Chain of air blower control

Switches of different purpose

Location:

The front side of the controller panel.

Function:

With the help of the switch it transfers the condition of the switch set by controller MICOM which is made by the method of matrix key.

1 – air-conditioner is started 2 – temperature decrease 3 – temperature increase 4 – distribution of streams 5 – to glass 6 – automatics 7 – increase of the fan speed 8 – fan switch-off 9 – to the bottom 10 – air recirculation 11 – decrease of the fan speed 12 – to the front 13 – to the bottom / glass

Controller

Location:

The right side of the driver’s seat.

Function:

Automatically adjusts temperature of interior and an air stream with the help of air mixing flap and the air blower relay by reception and reading of the entrance signals coming from different gauges, switch of the condition of temperature adjustment, PBR. Actuating of target and suction apertures, interruption of the compressor is carried out manually from the signals set up by the switch (switch and controller are made as one whole).

2 step vacuum diaphragm

Location:

Are set up on the site of heater (A) channel the mode flap.

Function:

Using underpressure of the engine, it starts each flap of the heater mode depending on work of the vacuum electromagnetic valve.

1 stage: moving on 25 mm.

2 stage: moving on 15 mm.

In total 40 mm - moving.

B - Levers of mode flap control

Vacuum damping valve

A – diaphragm side B – vacuum solenoidal valve side C – white color

Location:

Hose between the vacuum electromagnetic valve and 2-stage vacuum diaphragm.

Functions:

At influence of underpressure of the engine on 2-stage vacuum diaphragm, there detains underpressure on 4±2 seconds on diaphragm of 2-stage action for prevention of internal diaphragm damage.

Attention: on the case of vacuum damping valve, on black and white color there is a strip. White color should be directed to the side of the vacuum electromagnetic valve.

Heater vacuum valve

1 – electric motor of air mixing flap 2 – vacuum valve on the heater exit

Location:

Near to the electric motor of air mixing flap.

Function:

When the air mixing flap is in a position of maximal cooling, the heater valve is influenced by underpressure of the engine and blocks access of the cooling liquid of the engine into the heater core.

Suction hose

Location:

Set up together with internal air thermode.

Function:

Makes suction of the saloon air, using the difference of pressure arising at ventilation and connection of the hose end with air blower so that it would be possible to suck up to the built - in internal air thermode for reaction of temperature of the automobile saloon air.