Chery A15 / 480 LHD model. Manual — part 3

200 g or more refrigerants shall be charged
every time, and turn the compressor
several times by hand after the completion
of charging.

(5) Turn off the high-pressure manual valve 4,

shown in the figure below, and turn on the
low-pressure manual valve 3 to let the
refrigerant in gas-state charge into the
refrigeration

system.

The

refrigerant

charged from the low-pressure manual
valve must be gas-state. If it is liquid state,
the liquid hammer phenomenon may
appear to damage the compressor. Turn off
the low-pressure manual valve when the
reading of low-pressure gauge reaches
2.8X10

5

Pa.

Refrigerant Refilling
Regulated amount:R134a，850±25g

4. Leak Check of Refrigeration System

Three effective methods can be used to check
the air tightness of refrigeration system: check
with electronic leak detector, soap solution and
halogen leak detector.

1) Check with Electronic Leak Detector

As shown in the figure, connect the power
supply connector 2 of electronic leak detector
1 to the power supply, and move probe 3
slowly (30 mm/s), which should be placed 3
mm away from the check point. And if any
alarming sound is emitted, it means there is a
leak phenomenon occurred at that place.

2）Check with Soap Solution

Apply the soap solution to the possible leak
position. Observe whether air bubbles appear.
If there are air bubbles, it indicates a leaking
accident occurs.

3）Check with Halogen Leak Detector

The inspection procedure is described below:

(1) Check the liquid propane capacity in the

1. Electronic leak detector.

2. Power supply connector.

3. Probe

If the leakage occurs at the joints

of refrigeration pipes, the relevant

O-rings shall be replaced.

reservoir.

(2) Tighten the propane reservoir 16 to the

leak detector.

(3) Insert a lighting match into lighting device

9, and then slowly turn the adjusting
handle

14

in

the

counterclockwise

direction till the torch is lit.

(4) Adjust the flame to smallest. The smaller

the flame, the more sensitive to the leak of
refrigerant.

(5)Move suck pipe 3 to the possible leak

position.

(6) Observe the change of flame color. The

flame has no color if there is no leakage.
The flame is tint green if there is very
small leakage or be blue if there is
relatively big leakage, and it will become
purple if there is too much leakage.

5. Methods of Refrigerant Oil Charging
There are two methods for refrigerant oil
charging: direct charging method and vacuum
inhaling method.

1）Direct charging
Remove the oil charging plug 1, and charge
the specified model of refrigerant oil.

2）Vacuum inhaling
Vacuumize the refrigeration system to 30psi,
and then start to charge the refrigerant oil, the
procedures of which are as follows:

(1) Turn off the high-pressure manual valve,

and turn off the auxiliary valve.

(2) Remove the high-pressure side hose from

the manifold pressure gauge, and insert
the hose into the oil cup.

(3) Turn off the auxiliary valve to inhale the

refrigerant oil into the refrigeration system
from the oil cup.

(4) When the refrigeration oils in the cup are

nearly evacuated, immediately turn off the

Vacuum pump

Low-pressure gauge

High-pressure gauge

Low-pressure manual valve

High-pressure manual valve

Low-pressure side hose

High-pressure pipe

Air exhaust

Air return

Oil cup

Vacuumizing and Charging the Refrigeration Oil

High-pressure side hose

auxiliary valve

auxiliary valve so as to prevent the air
from being inhaled into the system.

(5) Connect the high-pressure side hose joint

to the manifold pressure gauge, turn on the
high-pressure manual valve, and start up
the vacuum pump to vacuumize the
high-pressure side hose. And turn on the
auxiliary valve to vacuumize for the
system to 30psi, and then vacuumize 15
min again so as to remove the air entering
into the system together with the oils. In
this case, the refrigeration oils are in the
high-pressure side, and the oils will return
back to the compressor after the operation
of the system.

3）Type & amount of refrigerant oil charged

Regulated amount: SP10 type, 150ml.

It is unnecessary to charge the refrigerant oil
into the newly-mounted A/C system, and it is
required to complement some refrigerant oil
only when a certain part is needed to repair or
when the vehicle is driven to a specified
mileage.

The amount of implementing oil required
when replacing parts is as follows: Evaporator
and condenser: 30ml. Drier: 20ml. and pipe:
10ml.

6. Methods of Refrigerant Vacuumizing

(2)

Turn on the high- and low-pressure valves
of manifold pressure gauge, and start up
the vacuum gauge.

(3) The vacuum pump works for at least 15

min to make the vacuum reading of
low-pressure gauge below 30psi . If the
vacuum reading can’t be obtained, turn off
the manual valves at the high- and
low-pressure sides, stop vacuumizing, and
check the leaking position.

(4) Turn off the valves, and the gauge needle

doesn’t return back within 10 min, which it
is called the vacuum leakage check method.
If the vacuum down, it shows that there is a
leaking position which can be found out by
using a leakage detector.

(5) If the gauge needle doesn’t considerably

It is difficult to pump out the water from the
refrigeration system when vacuumizing. But
the vacuumizing can reduce the fluidization
point of water after the vacuum is generated in
the refrigeration system, which enables the
water to boil at the lower temperature, and
pump out it in the form of steam from the
system.
Conduct the leak check firstly before
vacuumizing. If vacuumizing without the leak
check, it is difficult to find out the leaking
position after vaccumizing when there is a
certain leakage phenomenon.
The purpose of vacuumizing is to further check
the air tightness of the refrigeration system
under the vacuum condition, and prepare for
the

system’s

refrigerant

charging.

Its

procedures are as follows:
(1) Connect the high-pressure gauge hose to

the high-pressure service valve joint of
refrigerant tank, shown in the figure below,
connect the low-pressure gauge hose to the
low-pressure service valve joints on the
pipe from the evaporator to the A/C
compressor, and connect the intermediate
hose to the interface of vacuum pump.

Vacuumizing

1-

Connect to low-pressure service valve hose

2-

Connect to high-pressure service valve hose

3-Low-pressure gauge

4-High-pressure gauge

5-Low-pressure manual valve

6-High-pressure manual valve

7-Vacuum pump

High
pressure

Low
pressu
re

On

On

On