Connection diagram of air conditioning system components
1 - Evaporator; 2 - Bottom valve for filling and emptying the system; 3 - Compressor; 4 - Capacitor; 5 - Thermosensitive relay; 6 - Top valve for filling and emptying the system; 7 - Valve block
The layout of the components of the K / V system on the car
1 - Temperature-sensitive sensor-switch; 2 - Bottom valve; 3 - Top valve; 4 - Speed regulator; 5 - Evaporator body; 6 - Valve block; 7 - Electronic unit; 8 - Evaporator; 9 - Thermally sensitive relay; 10 - Supercharger relay; 11 - Compressor relay; 12 - Relay for the second speed mode of the fan; 13 - Fuse; 14 - ECU of the injection system; 15 - E / m valve; 16 - Temperature sensor; 17 - E / m coupling; 18 - Pressure relief valve; 19 - Fan; 20 - Capacitor; 21 - Pipeline; 22 - Pipeline; 23 - Compressor; 24 - 2-stage temperature-sensitive sensor-switch of the cooling fan; 25 - Valve
Air conditioning system (K/V) optional on LXi and GLXi class models of 1.3 and 1.6 liter petrol models. It is not possible to equip models equipped with a K / V system with a diesel engine. The functional diagram of the air conditioner is shown in the illustrations. A/C system components are manufactured in the Czech Republic, Germany and Japan.
The system allows to reduce the temperature and humidity of the air supplied to the passenger compartment, which significantly increases the comfort of the driver and passengers in the car.
Structurally, the K / V evaporator is combined with the heater body, the rear part and the air distribution dampers of which remain unchanged. An evaporator with its own fan is installed in the front of the casing.
In cooling mode, A/C operates on the same principle as a household refrigerator. The gaseous refrigerant is sucked into a belt-driven compressor and enters a condenser installed in front of the radiator, where it gives off its heat, passing into the liquid phase. Further, the liquid refrigerant enters the evaporator through the expansion valve, where it turns from a liquid under high pressure into a rarefied gas. This phase transition is accompanied by a sharp drop in temperature and, accordingly, cooling of the evaporator. The refrigerant then returns to the compressor and the cycle repeats.
The air blown through the evaporator is cooled and enters the heater assembly, where, by mixing with hot air coming from the heat exchanger of the latter, it is given the temperature set by the operator. The resulting mixture of the required characteristics (temperature and humidity) fed into the car.
If it is necessary to heat the air in the cabin, the system works like a conventional heater on standard models (see Section Interior heating / ventilation system - general information).
The compressor is installed in the left front corner of the engine compartment, it is driven by a multi-rib auxiliary belt, which simultaneously drives the generator. The belt tension is adjusted by changing the position of the generator.
The compressors are manufactured by Sanden, which gives them the designation SD7H13. The maximum compressor speed is 7000 rpm. The drive shaft is connected to the compressor shaft by means of an electromagnetic clutch, which smooths out jerks when the device is turned on and ensures the stability of the generator and smooth changes in the load on the engine.
The volume of the compressor is 129.2 cm3. The crepe of the compressor on the engine is carried out by means of four bolts.
The K/V condenser is installed in front of the radiator of the engine cooling system. The power consumption of the radiator fan is 250W. The temperature-sensitive relay, which receives information from the temperature sensor in the thermostat, turns off the compressor when the temperature of the coolant reaches 114°C.
The A/C control panel is equipped with two switches: system on/off and air temperature control.
In the event of a malfunction of the system, contact a specialist workshop or a Skoda authorized service center.
Precautionary measures
When servicing any components of the refrigeration path of the air conditioning system, special precautions must be taken. The same applies to procedures related to the need to disconnect the lines of the refrigeration path.
Warning! A liquid refrigerant is used as the working fluid in the car's air conditioning system (freon). Freon, as a chemical substance, is potentially dangerous, and therefore, only a qualified specialist can be allowed to handle it. If the refrigerant comes into contact with exposed skin, it can cause severe frostbite. Freon itself is not poisonous, however, when in contact with an open fire, it forms a highly toxic gas, therefore, inhaling freon gas through a lit cigarette can lead to the most unfortunate consequences. In addition, the release of freon into the atmosphere causes significant damage to the environment due to the irreversible destruction of the ozone layer.
If there is suspicion of a decrease in the level of refrigerant in the air conditioning system, its further use should be discontinued, as it is fraught with failure of the compressor.
Any disconnection of the components and refrigeration lines of the cooling system should be entrusted to specialists.