Iveco Stralis AT/AD. Manual

85701

Figure 5

The purpose of the air-conditioning system is to make the
cab comfortable as regards the following parameters:

- temperature and relative humidity of outside air;

- temperature and relative humidity in the cab.

The

system

subjects

the

air

thermodynamic

transformations that affect its temperature, relative humidity
and purity. This is accomplished by:
- ventilation, or introducing air taken from the outside

(therefore with the temperature and humidity of the
surrounding environment) into the cab;

- air-conditioning, or cooling and de-humidifying the air,

with the possibility of heating it afterwards as preferred
so as to change the temperature and humidity in the cab.

CAB INTERNAL VENTILATION DIAGRAM

VENTILATION
Description

Ventilation is the function of drawing in fresh air from the
outside, cleaned of pollen and dust by a special filter, or
recycling the air in the cab.

This system is composed of a shell, designed to house the
electric fan unit, air ducts, fresh air intake and recycled air
intake. The electric fan has several speeds to draw in and
circulate large masses of air.

General

CAB AIR-CONDITIONING

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

AIR-CONDITIONING AND HEATING
Description

This is accomplished by integrating an air-conditioning and a
heating system.

This integration makes it possible to change the temperature
and humidity in the cab.

Air-conditioning

Air-conditioning is accomplished by taking advantage of the
high capacity of some gases to lower temperature
considerably in their phase of expansion, thereby making it
possible to absorb heat from the cab.

This condition is obtained by two different levels of pressure
(high, when the refrigerant fluid is in its liquid state, and low,
when the fluid is in its gaseous state) that are established and
maintained during operation of the system.

Heating

Heating is accomplished by a radiator, in the heater unit, in
which the engine coolant circulates.

Special doors allow air to pass through the radiator only
when the heating function is activated.

The main components of the air-conditioning and heating
system comprise:

- compressor;

- condenser;

- the dehumidifier filter (incorporated in the condenser);

- three-level pressure switch;

- expansion valve;

- evaporator;

- heater/fan unit;

- pollen filter.

Figure 6

85702

Air-conditioning controls assembly

Manual

Heating and ventilation

1. Air temperature control knob, with extreme positions to

cut in the HI and LO functions (max and min air
temperature / turn to the left for fresh air — turn to the
right for warm air).

2. Electric fan knob with relative working speeds and

operation selection;

off (0);

manual operation (1-2-3-4).

Air inlet control knob:

- face zone air;
- face and feet zone air;
- feet zone air;
- feet and windshield zone air;
- windshield zone air.
4. Switch to turn on air recirculation: it prevents air flowing

in from outside.

5. Switch to turn on the air-conditioner.

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Legend
42045 Outside temperature transmitter

82000 Heater assembly

42608 Coolant pressure switches

25332 Compressor actuation remote-control switch

84019 Compressor

86116 Body Computer

72021 30-pin diagnosis connector

Figure 7

85703

Condenser

Dehumidifier filter

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

A. Recirculation geared motor (Ric) - E. Evaporator temperature sensor - F. Blown air temperature sensor - G. Modulates

blower control - H. Expansion valve.

Figure 8

85704

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

HEATER ASSEMBLY COMPONENT LAYOUT (WEBASTO)

Content .. 266 267 268 269 ..

Iveco Stralis AT/AD. Manual - part 268