Geely Emgrand X7. Manual part — 433

installed at one end of the evaporator and located at the inlet of the evaporator; one side of the expansion valve is
connected with the air inlet pipe and the exhaust pipe of the A/C compressor and the other side thereof is
connected with the air inlet pipe and the exhaust pipe of the evaporator; the high-pressure liquid refrigerant is
limited in the liquid pipeline so that the refrigerant becomes the low-pressure liquid when flowing to the
evaporator.

Expansion valve changes the position from large to small according to the lower limit of the A/C pressure and the
upper limit of the A/C pressure.

The evaporator is cooled and dehumidified before the air enters the passenger compartment. The following
processes are generated in the evaporator:

–

Low pressure temperature fluid /vapor refrigerant enter into evaporator.

–

Refrigerant flows through evaporation pipe.

– Refrigerant

vaporizes.

–

Absorb heat, when refrigerant vaporises, air flow absorb heat by evaporator

– Refrigerant enters into evaporator in the form of low pressure and low temperature, and leaves from

evaporator in the form of steam.

When the heat in air is transmitted to the evaporator core, moisture in air will be condensed on the outer surface of
the evaporator core to for water to flow outside.

The evaporator is equipped with a temperature sensor to prevent from freezing. The sensor measures the surface
temperature of the radiating fin on the evaporator, the compressor clutch will not continue to work if the
temperature is lower than 2.5℃. If the temperature is increased to above 4℃, the compressor will start working
again. In the system with automatic temperature control, the sensor signal is firstly transmitted to the A/C module,
and then is transmitted to the A/C pressure switch through a special line; if the A/C pressure meets requirements,
the corresponding A/C starting signal is transmitted to the ECM, and the ECM controls the on/off of the
compressor clutch.

5. Refrigerant R-134a and lubricating oil

Refrigerant function in the A/C system as follow:

– Absorb

heat

– Carrying

heat.

– Release

of

heat

The vehicle uses the R-134a refrigerant, which is a non-toxci, flame-retardant, transparent and colorleess liquefied
gas.

Please refer to the instruction to the disposal of the refrigerant pipeline and connector as well as the maintenance
of the chemical stability before the maintenance operation needing to open the refrigerating system pipeline or the
part.

The R-134a system is filled with the special-purpose lubricating oil FD46XG synthesized refrigerant oil which
easily absorbs water and needs to be stored in a enclosed container. Only the FD46XG synthesized refrigerant
lubricating oil can be used in the internal circulation of the R-134a A/C system. Only use the mineral-based 525
refrigerant oil at the thread and O ring and other lubricating oil used will result in compressor or accesesory
malfunctions.

Be sure to repair as follow in accordance with the steps in the instruction:

–

Recycle and regeneration of refrigerant

– Added

oil

–

Drain out refrigeration System

– Added

refrigeration

system

again

6. A/C high pressure pipe belonged to the A/C low pressure pipe and the A/C pressure switch.

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The vehicle uses A/C high pressure and low pressure pipes (A/C rigid pipe and/or hose) to connect the A/C
refrigeration system as a sealed and enclosed system in which the refrigerant and lubricating oil flow to complete
the circulation of the refrigerant. The A/C hard tube consists of an aluminum tube and corresponding adapter; and
the A/C hose consists of rubber hose and corresponding adapter.

A/C pressure switch belongs to three-state pressure switch, which transmits the A/C pressure signal.

Pressure added

Description

Metric (MPa)

Inch (psi)

Signal value

3.2 464.1

OFF

High-pressure side

2.6 377.1

ON

1.15 166.8

OFF

midde pressure side

1.55 224.8

ON

0.2 29.0

OFF

Low-pressure side

0.23 33.4

ON

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8.3.3 System operating principle

8.3.3.1 Functional description of A/C control panel

1． Temperature control

The temperature setting knob is used for setting the in-vehicle temperature; and the temperature adjustment can
get through the temperature knob

Change the mixed throttle by button to further change the air-out temperature.

Measure the position of the actuator (feedback voltage) when the A/C motor is in the Hi and Lo state:

Hot and Cold Air Adjust Motor

Voltage (V)

Low (Lo)

0.3

High (Hi)

4.7

2. Volume

control

Air adjusting knob controls the wind speed through the control of the sped regulating resistor of the blower. There
are totally 4 gears.

3. Air volume distribution (mode) control

The throttle can control the air-out mode through the adjustment of the mode, different allocation for air supply to
head and feet is for the purpose of supply the feet with warm air and the head with cool air to ensure the driver can
be constantly in a comfortable driving environment. The temperature distribution range is affected by the space of
the vehicle.

The user can choose 5 air-out modes:

– Blowing

face

– Blowing

face/blowing

foot

– Blowing

foot

– Blowing

foot/defrost

– Defrost

When the mode knob regulates, the mode will be changed as follows: surface blowing>surface blowing/foot
blowing>foot blowing >foot blowing/defrosting

The air allocation model and actuator position (feedback voltage):

Mode (air distribution mode)

Actuator feedback voltage

Air supply to face

0.3 V

Air supply to face/Air supply to feet

1.4 V

Air supply to feet

2.5 V

Air supply to feet/defrosting

3.6 V

Defrost 4.7

V

Blower gear

Voltage (V) at manual mode blower end

1 3.65

2 4.85

3 7.2

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4 12

4. Internal-outside circulation control

The user can choose outside circulation mode or inside circulation mode:

1. Under outside circulation mode, open outside circulation vent port and close inside circulation vent.

2. Under interior circulation mode, interior circulation vent port must open, and exterior circulation vent port

must close.

In the automatic control mode, the ventilation is controlled by a number of input variables. Input signal includes:

set point, in-vehicle temperature,out-vehicle temperature and sunlight intensity etc. In the automatic control mode,
there are two throttle positions (outside circulation and internal circuit) for ventilation.

Under manual control mode

–

Press down the fresh air button, venting valve keeps the outside circulation mode

–

Press down the circulation button, venting valve keeps the inside circulation

The ventilation model and actuator position (feedback voltage)

Ventilation

Actuator feedback voltage

Fresh air

0.3V

Circulation 4.7V

5. Defrost

control

The defrosting button is used to activate the front windshield defrosting function.

–

Air volume allocation models is defrost

–

Venting valve is in the new air position

–

A/C is "ON", and A/C mark display (only if outside temperature is too low)

When the temperature induced by the evaporator temperature sensor is lower than 2.5℃ during defrosting, the
compressor does not close (the A/C does not work).

When the starting temperature is in the temperature setting zone, A/C ON is optimized.

Rear defrosting function

The rear defrosting is controlled upon the engine speed signal and the time check function. If the engine speed is
lower than 750rpm, the controller shall cut off the rear defrosting output. In addition, the controller also has a time
check function to inspect the running tie of rear defrosting; and if the running time reaches 12m, cut off the output
of rear defrosting.

6. A/C

control

The control module provides an A/C request signal to the engine ECU to control the A/C compressor clutch
through the engine ECU.

The blower does not open and A/C also can not open.

The A/C can be turned on or off with the A/C button.

Closing of the compressor clutch

When the heat in air is transmitted to the evaporator core, moisture in air will be condensed on the outer surface of
the evaporator core to for water to flow outside. The evaporator is equipped with a temperature sensor to prevent
from freezing. The sensor measures the surface temperature of the radiating fin on the evaporator, the compressor
clutch will not continue to work if the temperature is lower than 2.5℃. If the temperature is increased to above
4℃, the compressor will start working again.

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