15.0 Schematic diagram of the air conditioning unit: 1 - fan; 2 - evaporator; 3 - throttle valve; 4 - connecting pipe for supplying low pressure during service work; 5 - connecting pipe for supplying high pressure during service work; 6 - dryer; 7 - radiator; 8 - compressor
a - air flow when the car is moving, cooling radiator; b - hot air.; c - uncooled air supplied by the fan; d - cooled air supplied to the passenger compartment
A - high blood pressure (gaseous refrigerant); B - high pressure (liquid refrigerant); C - low pressure (liquid refrigerant); D - low pressure (gaseous refrigerant)
Air conditioner
With the help of the air conditioner, the temperature in the passenger compartment can be kept below the ambient temperature. Thanks to the dehumidification of the air supplied to the passenger compartment, the windows do not fog up, for example, in rainy weather. The air conditioner cools and dehumidifies the air, which is subsequently heated by the heater.
When the cabin air recirculation mode is switched on, the air conditioner performs the cabin air transfer. This ensures its rapid cooling. Due to the fact that this mode does not freshen the air, it is recommended to turn on this mode for a short time.
The principle of operation of the air conditioner
The air conditioning compressor is driven by a ribbed belt from the engine crankshaft. The compressor pressurizes the refrigerant circuit up to a maximum of 30 bar, which causes the refrigerant to heat up and the ion changes into a gaseous state. The radiator takes heat from the passing hot air (cold air stays outside), which leads to cooling of the heated refrigerant, the ion returns to the liquid state (condenses). Flowing further along the circulation circuit under pressure, the refrigerant passes through a throttle valve, which reduces the pressure. After passing through the throttle, the refrigerant enters the evaporator and is re-cooled there. The cold refrigerant takes heat from the hot air around the evaporator, thereby cooling it. This cooled air is fed into the passenger compartment. From the heat received, the refrigerant becomes gaseous again and, under the influence of low pressure, is supplied to the compressor and the circulation of the refrigerant is repeated.
Attention! The order of work relating to the repair of the air conditioner in this manual is not given. Repair of the air conditioner must be carried out by a specialized workshop. Please note that the refrigerant circuit in the air conditioner must not be opened. Skin contact with refrigerant may cause frostbite.