Chery B11. Manual — part 124

Chery B11 Service Manual

Air Conditioner-19

Charging the refrigerant

Low
pressur
e

ON

High
pressur
e

Low
pressur
e

High
pressur
e

OFF

OFF

OFF

1-Refrigerant tank

2-Unlock valve

3-Low-pressure manual valve

4-High-pressure manual valve

5-Low-pressure gauge

6-High-pressure gauge

7-Connect to low-pressure

service valve hose

8-Connect to high-pressure

service valve hose

.9-A/C compressor

Chery B11 Service Manual

Air Conditioner-20

Section 12 Methods of Refrigerant Vacuumizing

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.

(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 0.07×10

5

Pa (708mmHg) . 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 return back within 10 min, it indicates that the

system is normal and the refrigerant can be charged into the system.

(6) Restart the vacuum pump, and turn on the low-pressure valve of the manifold pressure gauge

to continuously vacuumize 15 min. Then, turn off the low-pressure valve to stop

vacuumizing, and prepare for charging the refrigerant.

Chery B11 Service Manual

Air Conditioner-21

High
pressure

Low
pressu
re

On

On

On

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

Chery B11 Service Manual

Air Conditioner-22

Section 13 Methods of Refrigeration Oil Charging

There are two methods for refrigeration oil charging:

direct charging method and vacuum inhaling method.

I

Direct charging (shown in the right figure)

(1)

Remove the oil charging plug 1, and charge the

specified model of refrigeration oil.

(2)

Observe the level of oil through the plug hole, and

turn the clutch front plate to enable the piston

connecting rod just at the central position of the

plug hole.

(3)

Insert the dip stick 3 into the right side of piston

connecting rod till the dip stick end touches the

compressor casing.

(4)

Take out the dip stick, and check the reading

(mark) of refrigeration oil which shall be within

the scale 4 to 6 of dip stick.

II

Vacuum inhaling (shown in the right figure)

Vacuumize the refrigeration system to 0.2X105 Pa

(737 mmHg), and then start to charge the

refrigeration 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

refrigeration oil into the refrigeration

system from the oil cup.

(4) When the refrigeration oils in the cup are nearly evacuated, immediately turn off the

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 0.02X10

5

Pa

Direct Charging of Refrigeration Oil

1-Oil charging plug. 2-Piston connecting

Low-pressure gauge

Low-pressure manual valve

Vacuum pump

High-pressure gauge

High-pressure manual valve

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