How to fill a car air conditioning system with refrigerant

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 and filling method.

The weighing and filling method is a filling method that uses electronic scales to weigh the scale. 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.

Side leakage, vacuuming, filling, part, and then taking a taxi, from the low pressure test filling.

Replenish the refrigerant directly and charge the tool from the mortgage to fill the tool, if you need to replace it, you need to vacuum and add refrigeration oil at home 134a

Hello, this one is to be filled with a special machine.

This requires a cold filling device.

If there is no refrigerant in the air conditioning system, the refrigerant can be filled from both the high and low pressure sides, and if the refrigerant is already in the refrigeration system, it needs to be filled from the low pressure side.

Method 1: High-pressure end charging method.

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

Use refrigerant to remove air from the connecting hose.

Place the refrigerant tank tilted upside down on the scale and record the starting mass.

Open the valve on the refrigerant bottle and tank, then slowly open the high-pressure manual valve, the refrigerant is injected into the system, and when the scale indicates that the specified quality has been reached, the refrigerant valve is quickly closed. The high-pressure manual valve is closed and the charging is finished.

Method 2: Low-voltage side charging.

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

Use refrigerant to remove air from the connecting hose.

The refrigerant tank is placed upright on the scale and the starting mass is recorded.

Open the refrigerant tank valve, then open the low-pressure manual valve, and fill the system with gaseous refrigerant.

Start the engine and adjust its speed to 1250 1500r min, turn on the air conditioner switch, and turn the fan switch and temperature control switch to the maximum.

When the refrigerant is charged to the specified mass, close the low-pressure manual valve first, and then close the refrigerant valve.

Turn off the air conditioner, stop the engine, and quickly remove the high and low pressure hoses from the access valve.

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.

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 it is enough to go to the place where the car is repaired for 50 yuan.

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

2) Install a refrigerant tank.

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.

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) and manifold pressure gauge in the middle.

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

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

Refrigerant, also known as refrigeration working fluid, is the working medium of refrigeration cycle, which uses the phase change of refrigerant to transfer heat, which is both endothermic when the refrigerant is vaporized in the evaporator and exothermic when it condenses in the condenser.

At present, there are more than 80 substances that can be used as refrigerants, and the most commonly used are ammonia, freons, water and a few hydrocarbons. In September 1987, a special international conference was held in the Montreal Room in Canada, and the Montreal Agreement on the Depletion of the Ozone Layer was signed, which came into force on January 1, 1989, and restricted the production of CFCs such as R11, R12, R113, R114, R115, R502 and R22 of Freon.

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.

Vacuuming is performed prior to filling, followed by dosing. Now all 4S stores use refrigerant ** charging machine, which can realize refrigerant**, circulating purification, vacuuming, and quantitative filling. The popularity of this device is now very high, from thousands to tens of thousands.

However, there are also repair shops and repair points that are easy to operate.

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).

1. Prepare the same refrigerant as the type to be filled;

2. Prepare a good and qualified refrigerant filling tool;

3. Connect the adapter joint between the automobile air conditioner and the filling tool;

4. Vacuuming;

5. Fill with refrigerant. When injecting liquid refrigerant from the high-pressure side, it is not allowed to open the low-pressure manual valve on the manifold pressure gauge and never run the compressor, otherwise there is a risk of bursting the refrigerant tank. When injecting liquid refrigerant from the low-pressure side, the filling tank should not be inverted, and the high-pressure manual valve should not be opened, otherwise there is a risk of bursting the refrigerant tank.

As the temperature rises slowly, car air conditioners are slowly being used by people, and it is necessary to ensure a good cooling effect. So what are the filling steps of automotive air conditioning refrigerant?

1. First of all, vacuum the air conditioning system and close the high and low pressure manual valves on the manifold pressure gauge.

2. Connect one end of the intermediate hose with the joint of the refrigerant tank injection valve section. Open the opening valve of the refrigerant tank, and then unscrew the nut at one end of the manifold pressure gauge hose to ensure that the gas overflows, and then tighten the nut after a few minutes.

3. Then twist the manual valve on the high pressure side to the fully open position, and turn the refrigerant tank upside down.

4. Inject a specified amount of liquid refrigerant from the high-pressure side. Close the high-pressure manual valve on the refrigerant tank injection valve and manifold gauge before removing the gauge. When the appropriate amount of refrigerant is injected into the high-pressure side system, the engine should be in a state of non-starting, and the low-pressure manual valve on the manifold pressure gauge should not be unscrewed to avoid causing greater damage due to hydraulic shock.

1.After confirming that there is no leakage in the refrigerant system, twist the limb in a counterclockwise direction to loosen the handle of the injection valve so that the valve pin exits, and the refrigerant is injected into the middle.

2.Unscrew the middle injection hose nut connecting the center joint on one side of the high and low pressure gauges, and when you see the white refrigerant gas overflowing, you can hear.

3.Unscrew the manual valve on one side of the high-pressure gauge and pour the refrigerant upside down to inject the refrigerant into the refrigeration system in a liquid state.

4.Unscrew the low-pressure manual valve on one side of the low-pressure gauge and inject the refrigerant into the refrigeration system in the form of gas from the low-pressure side. Note: ...

5.When using a vial of refrigerant to fill, after the first filling is completed, use the first.

When the second and third are filled, the manual valve of the pressure gauge should still be closed first, and it should be re-filled.