When adding refrigerant to the refrigerator, how to add it?

The method is as follows: before connecting with the refrigerator, check whether the pointer of the pressure gauge is at zero position. If not, you can open the meter cover, adjust the zero adjustment screw to adjust the pointer to zero, and confirm that the refrigerator stops. The following steps 1~3 are strictly prohibited when the refrigerator is running.

First, connect the refrigerator: first close the high and low pressure valves; Connect and lock the low-voltage interface-blue pipe-low-voltage quick connector-system low-voltage phase measurement; High-voltage interface-red tube-high-voltage quick connector-system high-voltage phase measurement is connected and locked; Connect the filling interface-yellow pipe-vacuum pump and tighten it.

2. Vacuum the refrigerator: after the connection is completed, start the vacuum pump first; At the same time, open the high and low pressure valves, and then (open the high and low pressure quick connector), at which time the system begins to empty.

After a certain time (about 10~30min), check whether the system is completely vacuum. If it is not vacuum, check the leakage of the system, repair it and drain it again. Close the high and low pressure valves at the same time, and finally close the vacuum pump; Press for 3-5 minutes to see if there is any leakage in the system.

3. Charging the refrigerator with refrigerant: disconnect the yellow pipe from the vacuum pump, and then connect it to the refrigerant bottle and tighten it; First open the refrigerant bottle (forward), then open the valve core on the instrument cluster to exhaust the air in the yellow pipe, and then put the refrigerant bottle in reverse; At the same time, open the high and low pressure valves, add refrigerant to the system, close the high and low pressure valves when the specified amount is reached, and correct the refrigerant bottle at the same time.

Fourth, confirm the filling effect.

Start the system to run first; After a certain period of time (about 5~ 10min), check whether the high and low pressure of the system are normal (refer to the system manual). If it is not enough, slowly open the low-pressure valve (it is forbidden to open the high-pressure valve at this time), replenish an appropriate amount of gas refrigerant (the cylinder is placed forward), then close the low-pressure valve and retest.

If it is too high, close the gas cylinder, slowly open the high-pressure valve, and discharge an appropriate amount of refrigerant from the valve core of the instrument group (at this time, pay attention to the injury caused by the ejected refrigerant), then close the high-pressure valve and retest.

Repeat the above operation until it is normal. Shut down the system, first close the refrigerant bottle and the high-low pressure quick connector, and discharge the residual refrigerant in the instrument cluster from the valve core of the instrument cluster (at this time, pay attention to the sprayed refrigerant that hurts people), then remove the high-low pressure quick connector (at this time, pay attention to the high temperature and hot hands), remove the refrigerant bottle, and remove the trichromatic tube for safekeeping.

Extended data:

Precautions for adding refrigerant to refrigerator:

1, insufficient refrigerant, noise caused by consumption or leakage of expansion valve. Find the leak and repair it, and add refrigerant. ?

2, excessive refrigerant, beyond the specified value, increase the workload and produce abnormal sound. Excess refrigerant should be discharged to make the pressure meet the requirements. ?

3. If the compressor belt is loose or worn, please fasten or replace it.

4. The compressor is short of cooling oil. Due to the influence of dry friction, the oil should be added to the specified value. ?

5. If the refrigeration system contains moisture, replace the liquid storage tank, and refill the refrigerant after vacuumizing.