Installation instructions of automobile air conditioning compressor

Step 1: Recycled Refrigerant

1.It is recommended to slowly release the refrigerant from the low-pressure maintenance valve to avoid the loss of refrigerant oil in the system.

2.Observe whether the color of the discharged refrigeration oil is normal when the refrigerant is released.If the transparency, viscosity and color of the refrigeration oil in the system change, it means that the refrigeration oil has been contaminated or deteriorated.The entire system must be thoroughly cleaned before reinstalling the compressor.

Step 2:Compressor disassembly

1.Observe the gauge pressure. When the gauge pressure is 0Mpa, remove the suction and exhaust pipe interface.

2.The dismantled suction and exhaust interfaces and compressor suction and exhaust holes should be sealed in time，Prevent foreign matter from entering the pipeline and refrigeration oil loss

Step 3: Determination of original faulty parts

1. Compressor internal oil blackened, impurities, to clean the air conditioning system, replace the expansion valve and filter drier

2. Compressor internal refrigeration oil is free of impurities and not blackened and discolored, to do oil balancing of the air conditioning system.Prevent excessive refrigeration oil from causing abnormal noise of the compressor and poor heat exchange of cold coal circulation, resulting in a decrease in refrigeration effect

Step 4:Installation of compressor

1. Installation of compressor assembly，The fixing bolts should be pre-screwed, and the pre-tightening torque should be 10~12Nm.Pre-tighten the fixing bolts and then lock them slowly with a uniform torque diagonally, the final locking torque is 25~27Nm.Excessive torque will damage the compressor mounting feet or twist the compressor pump body, resulting in abnormal wear and tear inside the compressor; too little torque will result in loose bolts, vibration and abnormal noise.

2.Check that the compressor pulley groove must be installed in the same plane as the engine crankshaft pulley groove，The difference is ≤1mm, and the belt tension control new belt is 50-56N; Old belt 30-40N

 Step 5:vacuuming

1. After assembly, the system needs to be tested for positive pressure leak detection, and the booster pump is used to increase the pressure in the air conditioning system to 1.8-2.0Mpa，Static pressure preservation time ≥ 30min to ensure that there is no leakage of air-conditioning system.

2. Use an air conditioning service pressure gauge to connect the high and low pressure manifolds to drain the pressure from the system,Use a vacuum pump to vacuum the air conditioning system, and observe that the vacuum degree of the pressure gauge needle is -0.1MPa,When vacuuming ≥ 30min to ensure system tightness, vacuum and complete removal of water from the system If the air conditioning system is not adequately vacuumed。Part of the water and air remaining in the system, will cause "ice blockage" and excessive system pressure, etc., and ultimately damage the compressor.

 Step 6:Refrigerant filling

1. The amount of refrigerant filling should be based on the nameplate .

2. The filling process should pay attention to the air in the filling pipe discharge.

3. Filling mode: in the case of not starting the car, first high pressure filling, then high and low pressure filling together, until it can not be added, close the high and low pressure valve.

4. start the car after idling to start the air conditioning, open the low-pressure valve to continue to fill the cold coal, filling and nameplate labeling the same amount.