Chery S11 / Chery QQ. Manual — part 77

Chery QQ Service Manual

should be dropped on the seat surface of the connecting nut and the O-shape of seal

ring.

（

4）when the joint is screwed or unscrewed, two wrenches should be used, one is for

tightening, the other for supporting.

（

5）inlet connecting pipe of the stock solution drier should be connected with the

outlet connecting pipe of the condensator.

（

6）tighten the pipe socket nut according to the following required tightening torque.

Tigntening torque for connecting nut：8 ㎜ pipe：12-15N·m

（

1.2-1.5kg-m.8.6-11.01b-ft）1/2 inch pipe：20-25N·m

（

2.0-2.5kg-m.14.5-18.0Ib-ft）5/8 inch pipe：30-35N·m

（

3.0-3.5kg-m.22.0-25.3Ib-ft）

（

7）water drain hoses should be arranged in the way that the drained water should

not drop on the parts of the car.

3. Recovery of the refrigerant

Refrigerant recovery and regenerative unit must be used when refrigerant is

discharged from air conditioning system. Directly discharging refrigerant HFC-134a

（

R-134a）into atmosphere will bring serious effects on environment.

Note: when using recovery and regenerative unit, you must follow the operating

instruction of the device.

4. Management of refrigerant

（

1）when dealing with refrigerant, you must take the safety goggles to protect your

eyes.

（

2）avoid to touch liquid refrigerant directly.

（

3）the refrigerant tank should not be heated over to 40℃.

（

4）it is not allowed to discharge the refrigerant to the atmosphere.

（

5）it is not allowed to splash the refrigerant to the polishing metal surface because

the corrosive combination of refrigerant and water can make the polishing metal

surface dislustered (including chromium-coated part).

（

6）after refrigerant of the system is recovered, lost oil in compressor must be

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Chery QQ Service Manual

determined and make-up the same amout of oil.

Warning: if refrigerant HFC-134a（R-134a）splashes into eyes, you should go to

hospital for treatment quickly.

It is not permissible to wipe your hurted eyes, but to wash them with a large amount

of clean cold water to make the temperature of your hurted parts rise to the freezing

point.

Must go to see doctors or ophthalmology professors for treatment. If HFC-134a

（

R-134a）liquid splashes on skin, the hurt should be treated in the same way as the

frostbite treatment.

Section 10 Check Refrigerant System with Manifold

Measurement Unit

I. This method serves to confirm the fault position with manifold

measurement unit

Read the manifold pressure meter when the system reaches the following status:

（

1）set the switch on the circular position , the supplying air temperature is 30-35

℃

（

2）the engine runs in 1500r/min.

（

3）set the

rotate speed control switch of supply fan at high speed.

（

4）set the temperature control switch at the position where the cold air is most

sufficient.

Note：It should be indicated that the readings of the meter will change slightly

depending on the environment termperature.

1. Refrigeration system works normally

Reading on meter：

Low pressure side：0.15-0.25

MPa

（

1.5-2.5kg/cm

2

）

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Chery QQ Service Manual

High pressure side：1.37-1.57

MPa

（

14-16kg/cm

2

）

2.

Water vapor exists in the refrigeration system.

Symptom

：

discontinuous cold air to no cold air.

Fault symptom of

refrigeration

system

Possible reasons

Fault diagonosis

Troubleshooting

action

When running, pressure The vapor

entering

Drier is in

（

1）replace the stock

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Chery QQ Service Manual

at low pressure side

sometimes is normal,

but sometimes vacuum.

the refrigeration

system ices in the

spraying hole of

the expansion valve

to make the

circulation stop

temperarily, but

after the ice melts,

it can work

normally.

oversaturation

↓

Water vapor ices at

the spraying hole of

the expansion valve to

block circulation of

refrigerant.

solution drier

(2) evacuate air

repeatly to eliminate

the vapor in the

circulation.

(3) charge appropriate

amount of new

refrigerant.

3. Insufficient refrigerant

Symptom：insufficient cold air

Fault symptom of

refrigeration system

Possible reasons

Fault diagonosis Trouble-shooting

action

Low pressure at both

low pressure side and

high side

bad cooling Performance

air leakage at

somewhere in

refrigeration

system

Insufficient

refrigerant in system

↓

Refrigerant leakage

（

1）using air leakage detector to

check where there is leakage.

If necessary, repair it.

（

2）charge appropriate amount

of refrigerant.

（

3）if the reading is about 0

after connecting the meter, the

leakage positions should be

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