Method of adding refrigerant to an automobile air conditioner

First of all, it is necessary to determine whether there is any remaining refrigerant in the system, and if not, it is necessary to vacuum it from the new system and detect leaks. Vacuum must be evacuated at the same time as the high and low pressure interface, if there is still residual refrigerant in the system, it is necessary to eliminate whether there is leakage, the leakage point of the general automobile air conditioner is mostly at the interface and the rubber and aluminum tube pressure joint, with nitrogen pressure and soapy water can be found, the sealing rubber ring of the interface can be solved, pay attention to the type of refrigerant and the corresponding sealing ring when replacing, generally speaking, the automobile refrigeration system can not be completely sealed, under normal circumstances, the refrigerant will generally leak about 3 years, and the refrigerant can be added after the above problems are eliminated. When adding refrigerant, run the engine, turn on the air conditioner, add refrigerant from the low-pressure interface of the system, and check the leak again after adding. If the refrigerant is added after vacuuming, the compressor of some air conditioning systems will not run in the state of no refrigerant, and the compressor will run when the refrigerant is added to a certain Chengdu, which should be paid attention to in maintenance

Leak detection, evacuation, slowly add refrigerant, start the compressor, and then continue to slowly fill the refrigerant, when the low-pressure return pipe becomes cool and condenses, stop filling.

A special refrigerant container is required, and the new container must be vacuumed before use, and then the refrigerant is sucked in by negative pressure, and the refrigerant can not be filled beyond the limited empty volume of the container, otherwise it is easy to be dangerous!

First of all, is the refrigerant enough? (Look at the drying bottle or pipeline on a glass mirror, there are bubbles is not enough, transparent is enough, no ammonia that the compressor will not work) no ammonia to use the air machine to pump the joint of the tube or there is worn out, find and repair it with a vacuum machine to evacuate, okay add some compressor oil to add ammonia, the first bottle can be added directly, and then it will be started before adding it, add until the glass mirror has no bubbles, add 900 grams without a mirror, (to add to low pressure, It is to look at the joint on the pipe where the compressor comes out, which is the low-pressure joint).

The refrigerant filling should be carried out after vacuuming, and there are four filling methods: weighing filling method, gauge pressure filling method, empirical filling method and quantitative filling method.

1) Weighing. Filling method: weighing, filling method is a filling method that uses electronic scales to weigh. When operating, put the refrigerant cylinder on the tray of the electronic scale, connect the filter drier, the liquid filling pipe and the three-way valve, put the air in the connecting pipe, weigh the weight, and then subtract the amount of refrigerant that needs to be charged, write down the remaining weight, and then slowly fill the refrigerant until the scale matches the remaining quantity.

2) Gauge pressure filling method.

The gauge injection method uses the low-pressure suction pressure of the refrigeration circulation system to determine the amount of charge. When operating, the refrigerant cylinder is connected with the filter drier, the connecting pipe, the three-way valve and the vacuum pressure gauge can be charged, the indication value of the pressure gauge is observed when filling, when the pressure is expressed, the three-way valve is closed, let the compressor run, when the pressure gauge drops to 0, then open the three-way valve, adjust the pressure, and then let the compressor run for a period of time until the suction pressure is stable and unchanged.

3) Empirical annotation method.

The empirical filling method is a method of determining the amount of filling according to the cooling situation of the air conditioner. The connection method is the same as the gauge pressure filling method, when the refrigerant is filled to the vacuum pressure gauge value, close the three-way valve, and run for 30 minutes until the compressor suction pipe is condensed.

4) Quantitative dosing method.

The timing filling method is a method that uses the filler to fill according to the rated filling volume of the air conditioner. Select the appropriate scale of the graduated cylinder, open the corresponding valve, let the refrigerant flow into the graduated cylinder, when the refrigerant reaches the selected scale, open the filler valve, so that the refrigerant in the graduated cylinder flows into the refrigeration system. This method has an accurate filling volume and is suitable for on-site maintenance.

2.Before adding refrigerant for automobile air conditioning, it is necessary to prepare vacuum pumps, manifold meters, refrigerants, electronic scales, etc.

3.First, the manifold gauge is used to connect the vacuum pump and the liquid filling port on the air conditioning line to vacuum the system. Observe the scale on the manifold table, continue to pump for more than half an hour after vacuum pumping to the end (mainly for pumping water in the air conditioning system), close the manifold meter hand valve, turn off the vacuum pump, and keep the pressure for about 10 minutes.

4.Observe the scale on the manifold meter, and if the system vacuum is not **, disconnect the manifold meter tube from the vacuum pump, and connect one to the low-pressure tube dosing port and the other to the refrigerant cylinder. Before opening the manifold gauge hand valve, open the refrigerant cylinder, loosen the pipe joint, flush out the air in the pipeline with refrigerant, and then lock it tightly.

5.If you know the refrigerant filling amount specified by the car air conditioning system, you can use an electronic scale to quantitatively add liquid. The filling method is the same as below, except that the dosing amount is controlled by weighing the cylinder.

6.If you don't know the exact amount of refill, first release the manifold meter hand valve when the air conditioner is not turned on, and add as much refrigerant as possible. Then start the engine, turn on the air conditioner, slowly increase the engine speed to 1200 1500rpm, then pay attention to the window glass of the reservoir dryer, the bubbles will start to roll, and then the bubbles will gradually decrease.

When the bubbles are really good to disappear, close the manifold watch hand valve.

7.Close the refrigerant cylinder, disconnect the manifold gauge tube from the low-pressure pipe of the air conditioner, and complete the refrigerant filling of the automobile air conditioner.

1) Install the manifold pressure gauge, connect one end of the green hose to the middle of the pressure gauge, and the other end to the vacuum pump, and then carry out the vacuum operation.

2) Install a refrigerant tank.

Install the filling tank to the manifold barometer, completely close the valves on the low pressure side and the high pressure side of the manifold barometer, install the refrigeration tank to the green filling hose in the middle of the manifold barometer, turn the handle clockwise until the needle valve drills a hole in the refrigerant tank, turn the handle counterclockwise to exit the needle valve, press the air repel valve of the manifold barometer, and release the air until the refrigerant is released from the valve.

3) Fill the refrigerant from the high pressure side: When the engine is not working, open the high pressure side valve and add the refrigerant until the low pressure gauge reaches about 098 MPa, after filling, close the valve.

4) Check the air leakage and use the electronic leak detector to detect the air leakage of the system.

5) Fill the refrigerant from the low-pressure side: After closing the valve on the high-pressure side, start the engine and run the air conditioner, open the manifold pressure gauge, and add the specified amount of refrigerant.

Filling conditions: engine speed is 1500r min

The blower speed control switch is in the "high" position.

A c switch is "on".

The temperature selector is "Coolest".

Open all doors completely.

6) When replacing the filling tank, close the valves on both sides of the high and low pressure; After replacement, open the air drive valve to release air from the hose (green) in the middle and the manifold pressure gauge.

7) Check the refrigerant filling amount according to the pressure display of the manifold pressure gauge. When the refrigerant filling volume reaches the specified amount, the pressure of the manifold pressure gauge should also reach the specified value, and its specified pressure:

25 MPa on the low-pressure side

57 MPa on the high-pressure side

8) After the refrigerant filling volume meets the requirements, close the low-pressure side valve and shut down the engine.

Note: Be sure not to let the compressor work, when the air conditioner compressor is running, not filling from the low pressure side will cause the air conditioner compressor to lack oil and strain; Do not open the low-pressure side valve, the refrigerant is usually in a gas state in the air-conditioning compressor, if the low-pressure side valve is opened from the high-pressure side, the liquid refrigerant enters the low-pressure side, and if the air-conditioning compressor starts to work, there will be liquid shock and damage.

1. High-pressure end charging method.

2. Low-voltage end charging method.

In the high-pressure end charging method, the refrigerant is added to the system from the high-pressure end of the air-conditioning system.

1. Connect the manifold pressure gauge group with the system maintenance valve and refrigerant tank.

2. Use refrigerant to remove the air in the connecting hose.

3. Place the refrigerant tank on the scale at an inclined angle and record the starting mass.

4. Open the valve on the refrigerant bottle and tank, and then slowly open the high-pressure manual valve, inject the refrigerant into the system, and quickly close the refrigerant valve when the scale indicates that the specified quality is reached.

5. Close the high-pressure manual valve and the charging is finished.

Precautions: When the high-pressure end is filled with refrigerant, it is strictly forbidden to open the air-conditioning system, otherwise it will cause the bursting of the refrigerant tank, and the low-pressure manual valve should not be opened.

It is more convenient to go directly to the place where the car is repaired, and there are many tools to add yourself, so you can buy the first refrigerant online by yourself, and 50 yuan is enough to go to the place where the car is repaired.

<><4. Finally, measure the air pressure with a fluoride pressure gauge, and rotate the switch to increase the air pressure, so as to press the freon into the outdoor unit of the air conditioner.

The steps for adding refrigerant to automotive air conditioners are as follows:

1. At the beginning of adding automotive air conditioning refrigerant, it is necessary to assume that there is no leakage in the air conditioning system.

2. Before adding automotive air conditioning refrigerant, you need to prepare vacuum pumps, manifold meters, refrigerants, electronic scales, etc.

3. Start to connect the liquid inlet on the vacuum pump and the air conditioning pipeline with the manifold flow meter, and vacuum the system.

4. Observe the scale on the manifold meter.

5. If you know the refrigerant filling amount specified by the automobile air conditioning system, you can add liquid quantitatively through the electronic scale.

6. If you don't know the specific filling amount, lift the manifold manual valve and add as much refrigerant as possible when it cannot be started.

7. Close the refrigeration cylinder, disconnect the manifold from the air and low pressure regulating tube, and complete the filling of the air conditioning refrigerant of the car.

Vacuum first, then add ammonia oil. Punch at the high-pressure end until it can't be filled, and then turn off the high-pressure end. Start the car to turn on the air conditioner, turn on the air conditioner gear to the coldest (be sure to turn on to the coldest and the maximum air volume) and turn on the low pressure (remember to be low pressure), then the car air conditioner will suck in the refrigerant by itself.

Change the sensor signal and force it to work! You won't need it in winter, and it's never too late to recharge it in summer!

(1) Before filling the refrigerant, the automobile air conditioner should be vacuumed for 1 hour. In the state of no leakage and absolute vacuum inside, open the R134A cylinder with the bottle mouth downward, loosen the middle hose joint of the pressure gauge, drain the air in this section of the hose, open the manual valve on the high pressure side, and pour liquid refrigerant from the high pressure side.

2) When the pressure of the high and low pressure gauges reaches equilibrium and no longer rises, close the manual valve on the high pressure side, let the mouth of the R134A cylinder go up, and stop for more than five minutes.

3) Start the air conditioner, open the manual valve on the low-pressure side, and pour gaseous refrigerant from the low-pressure side, it is strictly forbidden to pour liquid refrigerant from the low-pressure side. At this time, the engine speed should be maintained at 800-1200rpm.

4) Observe the flow of refrigerant in the window in the refrigerant filling, and when the bubbles disappear, immediately close the manual valve on the low pressure side, and then put the suction and exhaust working valves in the rear seat position, and remove the maintenance pressure gauge.

Two liters of credit method. Refrigerant is added to the high-pressure end and fluorine is added to the low-pressure end.

Method steps for filling refrigerant at the high pressure end:

1.After the system is pumped into the air, close the high-pressure and low-pressure manual valves on the manifold pressure gauge;

2.Connect one end of the middle hose to the connector of the refrigerant tank jet valve. Open the refrigerant tank opening valve, then unscrew the nut at one end of the manifold pressure gauge hose to let the gas escape for a few minutes, then tighten the nut;

3.Screw the manual valve on the high pressure side to the fully open position and turn the refrigerant tank upside down;

4.A defined amount of liquid refrigerant is injected from the high-pressure side. Close the high-pressure manual valve on the refrigerant tank jet valve and the manifold pressure gauge, and then remove the pressure gauge;

Low-voltage end fluoride filling method:

1.First of all, the manifold pressure gauge is connected to the compressor and the refrigeration tank.

2.Open the refrigerant tank, loosen the nut of the middle injection hose on the manifold pressure gauge until you hear the sound of refrigerant vapor flowing, then tighten the nut and expel the air body injected into the hose;

3.Open the low-pressure manual valve to allow the refrigerant to enter the refrigeration system. When the system pressure is reached, close the low-pressure manual valve;

4.Start the engine, turn on the empty switch, turn the blower switch and temperature control switch to the maximum;

5.Open the manual valve on the manifold pressure gauge and allow the refrigerant to continue into the refrigeration system until the dosing volume reaches the specified value;

6. After filling the specified amount of refrigerant into the system, observe from the sight glass, if there are no bubbles and no excess refrigerant, then adjust the engine speed to 2000r min, and turn the air volume of the blower to the highest gear.

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