Chery B11. Manual — part 123

Chery B11 Service Manual

Air Conditioner-15

No.

Manifold Pressure Gauge Reading:

KPa (Kgf/cm

2

, lb/sq.in.)

Condition

Possible Cause

Method of Troubleshooting

8

The low pressure end is displayed as

vacuum, and the high pressure end is

displayed as too low pressure

● No cold air (under

some conditions, with

cold air but sometimes

without it)

● Frost or dew visible in

the

front/rear

of

container or expansion

valve

Refrigerant fails to

recirculate.

(1) Check if the heat sensing

tube leaks. If the expansion

valve failure, replace it.

If the result of (1) is normal,

(2) Blow the air into the

expansion valve to remove

the dirt from the expansion

valve.

If it is difficult to remove it,

replace the expansion valve.

(3) Replace the container

9

Too high pressure of low-pressure end,

and/or too low pressure of high-pressure

end

No cold air

Compression

insufficient

Repair or replace the compressor

Chery B11 Service Manual

Air Conditioner-16

Section 10 Refrigerant Charge Check

Check the refrigerant charge

1.

Enable the engine to operate at the idle speed

2.

Let the air conditioner operate for several minutes under

the maximum cold air condition

3.

Check the refrigerant charge

Observe it from the sight glass on the refrigerant pipe.

Item

Phenomenon

Refrigerant Dosage

Method of Troubleshooting

1

Air bubbles appear in the sight glass

Insufficient*

(1) Apply leak tester to check the air leakage,

and replace it as required

(2) Charge the refrigerant, till that the air

bubbles disappear

2

No air bubble appears in the sight glass

None, sufficient or
excessive

Refer to Item 3 and 4

3

Temperature difference between the
compressor’s air inlet and outlet

Null or almost null

(1) Apply leak tester to check the air leakage,

and replace it as required

(2) Charge the refrigerant, till that the air

bubbles disappear

4

Obvious temperature difference between the
compressor’s air inlet and outlet

Appropriate or excessive

Refer to Item 5 and 6

5

After the air conditioner is shut down, the
refrigerant of sight glass changes immediately
to transparent one

Excessive

(1) Recycle the refrigerant
(2) Drain the air, and charge appropriate

purified refrigerant

6

After the air conditioner is shut down, the
refrigerant firstly is foam state , and then
change and keep transparent

Appropriate

-

*: If refrigeration sufficient, there are some air bubbles in the sight glass at the higher ambient

temperature, and it can be regarded as a normal condition.

Refrigerant charge

Specified value: R134a, 850 g±25 g.

SIGHT GLASS

Chery B11 Service Manual

Air Conditioner-17

Section 11 Charging Method of Refrigerant

I. Precautions for Refrigerant Concerned

(1) Avoid the refrigerant contacting with your skin, and wear rubber gloves and safety

goggles while handling the refrigerant.

(2) Handle the refrigerant concerned at a well ventilated location. Since the refrigerant is a

colorless gas at room temperature and its density is greater than that of air, the refrigerant

will deposit in the maintenance location, which may easily cause the maintenance

personnel choked.

(3) Do not allow the refrigerant to contact with fire. otherwise it may generate the toxic gas.

(4) The O-ring can be applied once only.

(5) The Chery automobile with carburetor engine adopts the refrigerant R12 while the one

with electronic fuel injection type engine adopts the refrigerant R134a. The two kinds of

refrigerants can’t be applied in common use, and the compressor oils can’t also be mixed.

During the course of handling, it is unallowable that the tools contacting with one

refrigerant contact with the other refrigerant.

II. Method to Charge Refrigerant

If the 400g tanked refrigerant is required, a refrigerant tank unlock valve shall be applied (shown

in the picture below). The operation procedures are as follows:

(1) Before the unlock valve is installed on the refrigerant tank, turn the butterfly handle 1 in

the counterclockwise direction till the valve needle return back completely.

(2) Turn the plate-shaped nut 3 in the counterclockwise direction to lift it up to the highest

position, and then tighten the valve and the dummy club at the center of refrigerant tank.

(3) Install the intermediate charging hose of manifold pressure gauge on the joint 5, and then

turn the plate-shaped nut in the clockwise direction and tighten it by hand as possible.

(4) Turn the butterfly handle 1 in the clockwise direction to make the valve needle 4 in its front

end punch a small hole in the dummy club of refrigerant tank.

(5) Turn the butterfly handle 1 in the counterclockwise direction, which the refrigerant will

flow into the manifold pressure gauge along the charging hose.

(6) Then turn the butterfly handle 1 in the clockwise direction to the lowest position, and it can

close down the refrigerant tank again. However, do not detach the unlock valve, otherwise

the refrigerant inside the tank will leak out.

Chery B11 Service Manual

Air Conditioner-18

Refrigerant charging procedures are as follows:

(1) Connect the manifold pressure gauge to the refrigerant tank, shown in the picture below.

(2) Unscrew the handle of unlock valve 2 in the counterclockwise direction to enable the

refrigerant to enter the intermediate charging hose. In this case, do not open the handle valves

in the both sides.

(3) Unscrew the nuts of intermediate hose of manifold pressure gauge, and then tighten the nuts

of intermediate hose after the air inside the intermediate hose are drained when you see the

white refrigerant gas overflow and heard the “fizzle” sound.

(4) Turn on the high-pressure manual valve 4, shown in the figure below, stand the refrigerant

tank 1 upside down so as to let the refrigerant in liquid-state charge into the refrigeration

system. In this case, do not switch on the A/C unit to prevent the refrigerant from returning

back to the tank. 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 Tank Unlock Valve

1-Butterfly handle 2-Refrigerant tank charging valve

3-Plate-shaped nut 4-Valve needle 5-Charging valve joint