1

Overall leak detection

: After welding the three-way maintenance valve at the process nozzle of the compressor, the injection pressure of the ground valve is

0.8 ~ 1.0 megapixels

Nitrogen. Then use soapy water to detect the leakage of the exposed welding points (including the size and dimension of the evaporator in the freezing room)

Locke's ring joint)

If there is no leakage,

The pressure remains the same.

16

~

24 hours

front

6 hours

allow

2

% pressure drop,

rear

10~ 18h

Gauge pressure is not allowed to drop. If the pressure drops, it is judged that the refrigeration system is leaking, and the pressure must be kept in sections.

2

、

Sectional pressure keeping:

In order to narrow the search scope of the leakage point,

It is necessary to divide the refrigeration system of refrigerator into high pressure and low pressure.

Part or more,

Carry out pressure test and leak detection respectively.

The high-pressure part includes:

Condenser,

Compressor;

The low pressure part includes:

Evaporator, capillary and air return pipe.

Specific practices:

1

)

Separate the pipeline from the joint of the filter and the capillary tube, and seal the separated two pipelines respectively.

2

)

Remove the air return pipe from the compressor and seal the air return pipe on the compressor. At this time, from the compressor process pipeline

Filling of the three-way maintenance valve connected to the port

1.0

~

1.2 megapixels

Nitrogen, used for high pressure leak detection.

three

)

、

On the air return pipe removed from the compressor,

Then weld the three-way repair valve,

Fill from the three-way service valve

0.6

~

800 thousand pixels

Nitrogen, low pressure part leak detection.

three

Determine the leakage point

If external parts leak, they should be replaced.

If the leakage side of the built-in component is cut off according to the actual situation,

Repair and replacement, etc.

Method to fix it.

1

)

If it is determined that the high-pressure part leaks, it is recommended to replace the external condenser;

2

)

If it is determined that the evaporator of the freezing chamber leaks a lot, but the small lock ring leaks, replace it with a new lock ring (lock ring

Sealant can be purchased from Andian Service Department)

; The specific operation is as shown in the figure:

A

、

First, the evaporator is detached from the box,

After determining that Locke's ring was leaking,

Cut off the big ones with a knife,

Small Locke ring;

B

When replacing the lock ring of the evaporator pipeline connecting the refrigerating chamber and the freezing chamber, firstly, remove the oil stain and dust on the pipeline,

Then apply sealing liquid on the pipeline, and require that the sealing liquid cannot flow into the pipeline;

Insert the pipe into the replacement lock ring (

7.5

six

), insert it in place and rotate the locking ring for one week to make the sealing liquid evenly distributed.

Uniform, and then use crimping pliers to crimp the locking ring, requiring uniform force and crimping in place;

C

Replace the lock ring connecting the capillary tube and the evaporator pipe of the freezing chamber (

7.5

1.8

), the length of capillary insertion is required.

It is about one centimeter beyond the lock ring (to prevent the sealing liquid from blocking the nozzle of the capillary tube).

And the capillary tube is bent and fixed, however,

Then dispensing glue on the capillary and evaporator pipes respectively,

At the same time, insert the evaporator pipeline into the lock ring,

Turn the locking ring once.

Then press the locking ring in place with crimping pliers, and the force is required to be uniform;

three

)

、

If it is determined that the freezing evaporator leaks

(According to the judgment of the freezer evaporator, it can be pulled out and put in under pressure.

Observe whether bubbles overflow in the water, so as to judge whether the evaporator leaks)

, the evaporator of the same model will be replaced.

And the new Locke ring,

The specific operation method is the same as above.

(If there is no crimping equipment, it is recommended to use aluminum-clad covered electrode welding for the branch or outlet.

Pick up)

four

)

If it is determined that the pipe inside the box leaks (internal leakage)

, the backplane must be opened for maintenance. The specific operation is as shown in the figure:

A

At present, the internal pipes of Konka refrigerator are all made of aluminum pipes, which have strong corrosion resistance, long service life and short machine time.

Internal leakage mostly occurs in the box, because of the leakage of pipeline connection solder joints, so the location of solder joints must be known during maintenance;

Location of dry spots in Konka mechanical temperature control single-loop refrigerator

Location of internal solder joints in Konka computer temperature-controlled multi-loop refrigerator

B

Tools needed for back opening maintenance: a big screwdriver, a wooden hammer and two crowbars (homemade).

C

Maintenance method of back opening: firstly, pry the back plate evenly from the bottom of the box with a long opening and a crowbar.

20

Gong Zuozuo

Yes, pull open the foam laminated copper-aluminum joint for leak detection. If it leaks, you can use (

7.5

six

) Locke ring connection can also be made of aluminum.

Covered electrode welding,

When welding, the solder joint should be separated from the foam material.

So as to prevent that foam material from burning.

When the machine is repaired, put the backboard on the vice.

For plate shaping, you can reset the back plate with a wooden hammer (if you need to replace the new back plate, you can buy it from Andian Service Department).