Air conditioner--Air conditioning system

Air conditioner

Air conditioning system

Note

1. Do not dispose Refrigerant in sealed space or near

flame.

2. Wear glasses to protect your eyes.

3. Do not let liquid Refrigerant contact with your eyes

or skin.

If liquid Refrigerant contacts with your eyes or skin:

(a) Wash the contacted part with much water.

Warning: do not knead your eyes or skin.

(b) Spread clean Vaseline on your skin.

(c) Go to doctor or hospital for special cure.

4. Forbid heating it or making it expose the flame.

5. Forbid dropping the Refrigerant tank or shake it

intensively.

6. Do not operate compressor when Refrigerant is lack.

If the Refrigerant in cooling system is lack, it will incur com-

pressor burned out for lacking lubrication. So it is necessary

to avoid.

7. Do not open the high pressure valve of filling instru-

ment package when compressor is working.

If opening the valve at this time, Refrigerant will flow back into

refrigerant tank to incur the tank will break. So only the low

pressure valve could be opened or closed.

8. Do not fill Refrigerant too much.

Too much refrigerant will make many problems such as lack

cooling degree, oil consumption, too hot engine and so on.

Inspection on automobile

1. Check the No.1 pressure switch.

(a) Control for electromagnetic clutch:

Check the function of pressure switch.

(1) Assembly filling instrument package.

(2) Connect the anode lead of OUM meter to No. 4 termi-

nal and connect cathode lead to No. 1 terminal.

(3) Liking that shown in figure. When refrigerant pressure

is changed, check the conduction between terminals.

wrong       correct

Low-pressure

side

High-pressure

side

Not

conduction

Con-
duction

Not

conduction

 213 

Air conditioner--Air conditioning system

If resistance does not accord with the regulation, it is necessary to change heat sensitive resistance.

If the function does not accord with the regulation, it is

necessary to change pressure switch.

(b) Control for cooling fan:

Check the function of pressure switch.

(1) Connect the anode lead of OUM meter to No. 2 termi-

nal and connect cathode lead to No. 3 terminal.

(2) Liking that shown in left figure. When refrigerant pres-

sure is changed, check the conduction between

terminals.

If the function does not accord with the regulation, it is

necessary to change pressure switch.

Inspection

1

1

1

1

1

.

.

.

.

.

No.1 thermal resistor

(a) Check the resistance between No.1 terminal and No.2 ter-

minal of No.1 heat sensitive resistance at different

temperatures, liking that shown in figure.

Conduc-
tion

Not conduc-
tion

 214 

Resistance:

-

-

-

-

-

2

2

2

2

2

5

5

5

5

5

-

-

-

-

-

1

1

1

1

1

5

5

5

5

5

-

-

-

-

-

5

5

5

5

5

5

5

5

5

5

1

1

1

1

1

5

5

5

5

5

2

2

2

2

2

5

5

5

5

5

3

3

3

3

3

5

5

5

5

5

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

6

5

5

5

5

5

7

7

7

7

7

5

5

5

5

5

8

8

8

8

8

5

5

5

5

5

1

1

1

1

1

5

5

5

5

5

1

1

1

1

1

0

0

0

0

0

8

8

8

8

8

6

6

6

6

6

4

4

4

4

4

2

2

2

2

2

2

2

2

2

2

0

0

0

0

0

Resistance

Temperature

Refrigerant

Inspection on automobile

1. Inspection of refrigerant quantity

Observe the visible window on high pressure liquid pipe.

Testing condition:

 

 

 

 

 

¡ñ

¡ñ

¡ñ

¡ñ

¡ñ

 

 

 

 

 

Engine runs at the speed of about 1500 rpm.

 

 

 

 

 

¡ñ

¡ñ

¡ñ

¡ñ

¡ñ

 

 

 

 

 

Fan speed is controlled at “HI” position.

 

 

 

 

 

¡ñ

¡ñ

¡ñ

¡ñ

¡ñ

 

 

 

 

 

A/C switch turns to ON.

 

 

 

 

 

¡ñ

¡ñ

¡ñ

¡ñ

¡ñ

 

 

 

 

 

Temperature control turns to “MAX. COOL” position.

 

 

 

 

 

¡ñ

¡ñ

¡ñ

¡ñ

¡ñ

 

 

 

 

 

Automobile doors are opened.

Air conditioner--Refrigerant

Item

Phenomenon

Refrigerant quantity

Verify

1

There is air bubble on window.

Lack

(1)Use leakage measurer to check whether there is any leakage,

      if necessary, repair it.

(2)Add refrigerant until air bubble disappears.

2

There is no air bubble on window.

Without, full or too full

Referring to item 3 and 4.

3

There is no temperature difference on

Without or little

(1)

Use leakage measurer to check whether there is any leakage, if necessary, repair it.

outlet and inlet of compressor

(2)

Add refrigerant until air bubble disappears.

4

There is obvious temperature difference

Applicable or too much

Referring to item 5 and 6.

on outlet and enter of compressor.

5

Window becomes clear after air

Too much

(1)Reclaim refrigerant.

conditioner is closed.

(2)Exhaust air and supply applicable clean refrigerant.

6

After air conditioner is closed, refrigerant Applicable

-

makes bubble, then becomes clear.

*

When environment temperature is normal and refrigerant is enough, it is normal when there is no

bubble in window.

2. Use filling instrument package  to check the refrigerant pressure.

This is a type to use filling pressure meter to check the malfunction position. In following situations, read

the meter.

Testing condition:

z

Switch is set up at inner air cycle, and the inlet temperature is 30-50°C.

z

Engine runs at the speed of 1500 rpm.

z

Set up the speed control switch of fan at “HI” position.

z

Temperature control switch is set up at “COOL” position.

z

A/C switch turns to “ON”.

z

Automobile door is opened completely.

Hint: please pay attention to that the show of meter might change little for environment tem-

perature changes.

View window

 215 

(1) Refrigerant system with normal function.

Meter reading

Low pressure end:

0.15-0.25Mpa

High pressure end:

1.37-1.57Mpa

(2) Water in cooling system.

Air conditioner--Refrigerant

W h e n   c o o l i n g   s y s t e m   i s
working, the pressure in low
pressure end changes to
vacuum or normal periodically.

Water vapor enters refrigerant
system, and freezes on the ex-
pansion valve, the system
stops cycle in short time, when
ice melts, it returns to normal
again.

(1)Change the condenser.
(2)Remove water in pipeline

with method of taking out
vacuum repeatedly.

( 3 ) F i l l   a p p l i c a b l e   n e w

refrigerant.

z

Dryer locates at full humidity
state.

z

Water vapor of refrigerant
freezes on the outlet orifice
of expansion valve to ob-
stacle freezing cycle.

Phenomenon

Possible reason

Diagnose

Method

(3) Lack refrigerant

Situation: too cold periodically, then lose cooling degree.

z

The pressure of high and low
pressure end is low.

z

T h e r e   i s   a i r   b u b b l e   o n
window.

z

Refrigerant leaks.

Some part of refrigerant system
leaks.

( 1 ) C h e c k   i t   w i t h   l e a k a g e

measurer, if necessary, re-
pair it.

(2)Fill refrigerant to applicable

quantity.

(3)If meter pressure reading is

0, after checking and repair-
ing leaking position, take out
vacuum.

z

Refrigerant in system lacks.

z

C o o l i n g   d e g r e e   i s   n o t
enough.

Phenomenon

Possible reason

Diagnose

Method

State: lack refrigerant

 216