Air conditioning system
Blower module
Heater and evaporator module
General Refrigerant Handling Precautions
1. R-134a refrigerant is highly volatile. Contact with a drop of refrigerant on the skin can cause local frostbite. Gloves must be worn when working with refrigerant.
2. Use goggles to protect your eyes and gloves to protect your hands. If refrigerant gets into your eyes, rinse immediately with water.
3. The R-134a refrigerant tank is under high pressure. Do not store the container in places where it can be exposed to high temperatures. Storage temperature should not exceed 52°C.
4. Check the tightness of the system with an electronic leak detector. Remember that R-134a refrigerant releases highly toxic phosgene gas when exposed to an open flame.
5. Use only the specified brand of oil to charge the R-134a refrigerant circuit. The use of other brands of oils may cause system failure.
6. Since PAG oil strongly absorbs moisture from the surrounding air, the following precautions should be observed:
When removing any parts of the refrigerant circuit, plug the openings immediately to prevent moisture from entering.
When installing refrigerant circuit parts, remove the hole plugs immediately before installing the parts.
Connect all pipes and hoses as soon as possible to prevent moisture from entering the air conditioning system.
Use only the specified brand of compressor oil from a sealed container.
7. In case of accidental leakage of refrigerant from the system, ventilate the work area before continuing work.
Precautions for Replacing Air Conditioning Parts
1. It is forbidden to loosen the connections of parts before draining the refrigerant from the system.
2. To prevent moisture from entering, immediately close open parts with caps or plugs.
3. Remove protective plugs only immediately before installing the part.
4. When connecting fittings of parts, be sure to install new o-rings, having previously applied refrigerant or oil to the fitting and seal.
Installation of fittings
1. Flange connections with guide pin
1) Check the presence of the O-ring, make sure it is not damaged and apply compressor oil to it.
2) Insert the stud as shown in the illustration and hand tighten the nut.
3) Tighten the nut to the required torque.
Note: Number with label «T» on the bolt head indicates the tensile strength of the bolt.
2. Maintenance of pipeline and connections
When using a moisture-free refrigerant and recommended lubricants, the internal surfaces of the cooling system components will maintain chemical resistance. Excessive levels of dirt, moisture or air can impair the chemical resistance of the internal surfaces and eventually cause malfunctions or serious damage.
Precautions to be observed
1. If it is necessary to depressurize the cooling system, prepare in advance all the tools and spare parts that will be required to perform system maintenance so that the system is in a depressurized state for the strictly necessary time.
2. Plug or plug all piping and connections immediately after disconnecting them to prevent dirt and moisture from entering.
3. All pipelines and other elements of vehicle systems stored in the spare parts warehouse must be hermetically packed until they are ready for use, or their openings must be closed with plugs.
4. Do not bend molded piping elements of the system to fit in place. When servicing refrigeration units, use piping elements of the required shape.
5. All fixtures, including the refrigerant charge manifold, pressure gauge manifold, and inspection hoses, must be clean and dry.
1. Capacitor
2. Receiver dryer
3. Compressor
4. Expansion valve
5.High pressure port
6. Low pressure port
7. Pressure sensor in the air conditioner