Chery A15 / 480 LHD model. Manual — part 1

AIR CONDITIONER SYSTEM

AIR CONDITIONING SYSTEM OVERVIEW … … … … … … . . . … U-2

REFILLING OF REFRIGERANT AND REFRIGERANT OIL … … … … … … … U-6

A/C SYSTEM COMPONENTS … … … … … … . … … … … … . . … U-14

FAILURES AND SHOOTING ANALYSIS SHEET … … … … … … . … … … U-20

PRECAUTIONS ON THE SECURITY OF A/C SYSTEM … … … … . … …U-21

AIR CONDITIONING SYSTEM OVERVIEW

Based on its function, the Chery A15LHD air
conditioning unit may be divided into such five
basic components as the refrigeration system,
heating system, ventilation system, control system
and air purification system.

1. Refrigeration system It is available to cool
the air inside the vehicle based on the refrigeration
principle of vapor compression refrigerator. The
temperature of evaporator as the cold source is
lower than the dew-point temperature of air, so the
refrigeration system also play the role of
dehumidification

and

air

purification.

The

refrigeration system of Chery's electronic fuel
injection type engine adopts the coolant R134a. As
shown in the figure, the refrigeration system
mainly consist of the compressor, condenser,
expansion valve, evaporator and etc. In the
evaporator, the coolant fluid absorbs the heat from
the air inside vehicle and is gasified to the
low-pressure, low-temperature coolant vapor, and
then is inhaled into the compressor.

Evaporator

A/C Control System

Warm air radiator

Condenser and Circuit

Compressor

The coolant vapor will be compressed by the compressor as the high-temperature,
high-pressure gas which enters into the condenser. In the condenser, the coolant is cooled by
the ambient air, and condensed into the fluid after emitting its heat outwards, then the
moisture content is filtered and removed from the fluid via the fluid reservoir. The
high-temperature, high-pressure coolant fluid is throttled down through the expansion valve
(installed in the inlet pipe of evaporator) to reduce its pressure and temperature, and then the
fluid enters into the evaporator. The low-temperature and low-pressure coolant fluid also
absorb the heat from the inside of vehicle, and gasifies again to the low-temperature and
low-pressure coolant vapor, and then is inhaled into the compressor. In such a manner, the
coolant cycles recurrently to make the indoor temperature of vehicle reduce. The pipelines
for coolant are shown in the figure below:

2. Heating system It adopts the engine coolant as the heat source and introduces the
coolant into the radiator located at the compartment to heat the indoor air via the blower, and,
at the same time, it is also used to defrost and defog the front windscreen.Chery A15LHD’s
air conditioning unit adopts the reheating mixed type unit, the heating system of which is
used not only to individually heat the circulating air from the inside of vehicle or the fresh air
from the outside, but also to firstly cool these two kinds of airs and then heat the whole or
part to obtain the air temperature required. It is available to dehumidify the air, and also to
filter the air so as to get the clean air with desired humidity.

Compresso

r

Condenser

Fan

Evaporator

Drying

Bottle/Collector

Expansion

Valve

3. Ventilation system Apart from the cool and heat the air inside the vehicle, the
centrifugal blower is also used to change and ventilate the air inside the vehicle. The
ventilation system consists of the air filter, air inlet, air duct, vent and etc. The system
introduces the fresh air from the outside of vehicle into the inside while the ventilation and
discharge port extracts the vitiated air from the inside to the outside. Chery A15LHD adopts
the natural ventilation and forced ventilation. The open/close fresh air inlet is controlled by
the fresh/circulating air vacuum valve.

During the natural ventilation, the fresh air enters into the vehicle from the air inlet fixed
under the front windscreen (positive pressure area), and gets into the trunk from the seat belt
notch on the trunk cover, then passes across the vents (negative pressure area) on the body
rear skirt, trunk lining, rear side beam and finally discharges to the atmosphere. Due to the
movement of air in the rear body compartment, it plays a good role to defrost the rear
windows. In addition, the whole process is conducted without pressure, so the air changing
doesn’t create any noise and has nothing with the driving speed.

And during the forced ventilation, in case that the fresh air doesn’t pass through the heating
radiator (the mixed gate closed) after the air is pressurized by the blower, the air will enter

into the vehicle via all air ducts, and then discharge along the same route as that of natural
ventilation to the atmosphere.

An individual type casing system with blower

1. Restrictor damper

5. Fresh/recirculated air door

9. To panel

2. Heater core

6. Recirculated air

10. A/C defrost damper

3. Blower motor

7. Evaporator core

11. To defroster

4. Fresh air

8. Air mix damper

12. To bottom outlet