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Device features
| Fig. 11.2. The scheme of movement of air in a block heating and air conditioning: 1 - valve flow distribution of inlet air (heater / demisting); 2 - upper air distribution flap; 3 - exchanger heater; 4 - valve temperature controller; 5 - the heat exchanger evaporator; 6 - fan motor (electric blower); 7 - the front flap; 8 - lower air distribution flap; 9 - the air conditioner; 10 - air vents of the windscreen; 11 - air vents for side windows; A - position of valves for the air supply of the cabin; The - the position of the damper for fresh air |
Management of heating and ventilation system interior is carried out independently of the air conditioning system when the function of heating and salon ventilation, defrosting and condensed moisture from the windshield defroster door. At the same time the basic elements of work and the heater when the air conditioner. The nodes of a heater and air conditioner evaporator coil located in the same block. The scheme of movement of air in a block heating and air conditioning is shown in Fig. 11.2. The basic units of the heater: - The heater heat exchanger (radiator) for heating the air in the passenger compartment warm engine coolant fluid; - Electrically driven fan (blower), which provides an adjustable supply of outside air dampers to the heater and air conditioning; - Temperature control damper air from the heater into the cabin, from changing its position depends on the amount of air passing through the heater heat exchanger, and the outdoor air flowing in the bypass heat exchanger; - Distribution flap air from the duct heater in the cabin or to blow the windshield.
| Fig. 11.3. The control panel heating and cooling: 1 - the temperature control in the passenger compartment air; 2 - mode switch of the fan blower; 3 - control air distribution; 4 - the switch of the electric-glass tailgate window; 5 - Switch recirculation mode; 6 - air conditioner switch |
In Fig. 11.3 shows the control panel heating and air conditioning in the car, mounted on the dashboard console. Appointment and operation of controls air conditioner described in Sec. 1 "device the car" see. "Heating (air-conditioning), and blower". Switch 2 modes blower fan runs independently of the position of air distribution and temperature and controls the fan speed by varying the voltage in the power of the motor. Knob 3 air distribution, temperature controller and the switch is controlled recirculation heater valves via cable drives. The air conditioning system operated controls, located on the panel, with a total heater (see. Fig. 11.3). The air conditioning system includes the following elements. The compressor is belt-driven by the engine crankshaft pulley. The compressor pulley built electromagnetic friction clutch, breaking the shaft of the compressor pulley or connecting them with the air conditioner on a signal of the electronic engine control unit. When the compressor is compressed to high pressure refrigerant vapor coming to him from the evaporator coil. The temperature of the refrigerant vapor at the outlet of the compressor is considerably higher than at the inlet. Pressure reducing valve is built into the compressor and has a protective function, actuating pressure increases more than the allowable value at the output of the compressor. The reason for triggering a pressure reducing valve failure can be high-pressure valve, electrical fan, etc.. The heat exchanger (radiator) condenser, located in front of the radiator and the engine cooling system having a coil with fins developed for the rapid cooling and condensation of the compressor to a high pressure refrigerant vapor. The throttle nozzle (reducer) with mesh filters at the inlet and the outlet is installed in the pipeline, the supply liquid refrigerant to the evaporator. Orifice in the nozzle limits the flow of liquid refrigerant and lowers the pressure in the evaporator. After stopping the engine, liquid refrigerant continues to flow for a while after the throttle tube from the zone of high pressure in the low-pressure zone. The flow of liquid through the orifice is accompanied by a characteristic hissing sound which is heard for 30-60 seconds after the engine has stopped and is not a malfunction. The heat exchanger (radiator) evaporator. Liquid refrigerant condensing coil through the throttle nozzle enters the evaporator coil located in block heater. In the heat exchanger fluid passes to the gaseous state, absorbing heat. The moisture contained in the air supplied to the heat exchanger, condenses it, dripping from the evaporator and removed from the block heater. From the heat exchanger the evaporator refrigerant gas with a small amount of admixture of the liquid fraction of the refrigerant and the refrigerator oil drops enters into the receiver, which is connected to the outlet conduit of the evaporator. The receiver-dryer. At the bottom of the housing of the receiver is a container of absorbent water vapor from the refrigerant vapor that getting rid of the moisture through the hole in the intake tube, mixed with the refrigeration oil. The upper housing fitting located receiver for joining pipes. Neremontoprigoden receiver, it must be replaced only in gathering. In addition to these elements, the system includes valves, high and low pressure, and pressure sensors.
| Fig. 11.4. Schematic diagram of the movement of the refrigerant in the air conditioning system: 1 - air conditioning compressor; 2 - condenser coil; 3 - throttle connection (gear); 4 - the evaporator; 5 - receiver-dryer; 6 - desiccant in the receiver; 7 - opening for mixing with the refrigerant vapor refrigerant oil; 8 - the discharge valve in a compressor; A - liquid refrigerant under high pressure; B - the liquid refrigerant under a low pressure; C - the gaseous refrigerant under a high pressure; D - the gaseous refrigerant under a low pressure |
Schematic diagram of the movement of the refrigerant in the air conditioning system is shown in Fig. 11.4.
WARNINGS All repairs to the air conditioning system should be carried out only when the system is fully discharged. As the refrigerant vapor is toxic, repair the system using special equipment available in the specialized service for maintenance of air conditioning systems. |
NOTE In connection with the specific features of repair air-conditioning system (see. The warning above) in this section describes only works on removal and installation of the control unit air conditioning and heating as well as the removal of the remaining elements assembly of heating and air-conditioning (including heat exchanger) is required complete removal of the unit from the car with the air conditioning system depressurization. |
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