Nanjing Iveco light vehicle air conditioner circuit diagram

Nanjing Iveco light vehicle air conditioning system is a non-independent structure. It is driven by the engine crankshaft pulley through the electromagnetic clutch of the compressor. The electromagnetic clutch is in turn determined by the temperature control switch (manual or automatic and manual combination) to determine the separation and combination. Its refrigeration part It is composed of compressor, condenser, liquid receiver, expansion valve, evaporator, electronic control system and pipelines. The refrigerant is R-12 (Freon), and the refrigeration method is vapor compression refrigeration. After the refrigerant absorbs the heat in the cab in the evaporator, it evaporates and vaporizes into gas. After being inhaled and adiabatically compressed by the compressor, it turns into high-temperature (about 7°C) and high-pressure (about 1.5MPa) gas, and is sent to the front of the car. Heat is dissipated in the condenser.

After the high-temperature and high-pressure refrigerant vapor enters the condenser, it condenses into a high-pressure liquid, releases condensation heat, and transfers the heat in the refrigerant to the atmosphere, thereby causing the temperature of the refrigerant to drop. The high-pressure refrigerant liquid is discharged from the condenser, dried and filtered by the liquid storage unit, throttled through the expansion valve and greatly decompressed to about 0.2MPa, and becomes a low-pressure liquid-gas mixture before entering the evaporator again.

The refrigerant that has been throttled and decompressed evaporates from liquid mist into low-pressure (0.2MPa), low-temperature (O℃-5℃) refrigerant vapor in the evaporator, thereby absorbing the heat around the evaporator (vaporization heat), the indoor temperature of the ride decreases. As long as the compressor keeps running, the above processes will continue to cycle (compression, heat dissipation, condensation, throttling, heat absorption, evaporation, compression, heat dissipation and condensation...), and the indoor temperature and humidity are controlled within an appropriate range. Inside.

1. The functions of each component on the air conditioning control panel (as shown in Figure 20)

(1) The power/air volume switch (SA) is a four-speed knob-type switch. The "0" position cuts off the power; the "ⅠⅡⅢ" position (or L, M, H position) Turn on the power, and at the same time make the air supply volume of the evaporator fan in the small, medium and large states accordingly.

(2) Refrigeration mode switch (SA2) is only available for A40.10. The enhanced air conditioning system of light vehicles has this switch. It is a single-pole, single-throw switch. When its upper end is pressed (i.e. HAND position), the air conditioning system uses forced cooling. At this time, the temperature in the car is not affected by the thermostat (WKQ), and the cooling process continues until this switch Until it is disconnected, when the lower end of the mode switch is pressed (i.e. AU-TO position), the air conditioning system is in the temperature-controlled cooling mode, and the start and stop of the refrigeration process is controlled by the thermostat.

(3) The thermostat potentiometer (RP) is installed on the printed circuit board of the thermostat and can be used to set the indoor cooling temperature. When the potentiometer is in the two extreme positions, the temperature in the car interior is set accordingly at 18~32°C (or the evaporator outlet temperature is set at 3~18°C). When the potentiometer is in the middle position, the interior temperature of the car is set at 25°C (or the evaporator outlet temperature is set at 11°C). When the actual temperature inside the car is higher than the set temperature, cooling starts, and when the actual temperature is lower than the set temperature, cooling stops.

(4) Some models have only one indicator light on the air-conditioning control panel, indicating that the refrigeration system is in operation (30.10V type, 40.10V type, 40.10VS type and 35.10 type). But most of them are equipped with power indicator light (POWER), refrigeration indicator light (COOU), low-voltage fault alarm light (LP) and high-voltage fault alarm light (HP). Their functions are as follows: Power indicator light (POLVER): The air volume switch is in non- At the zero position, the light is on, indicating that the air conditioning system control power is turned on.

Refrigeration indicator light (COOL; this light is on during cooling, indicating that the air conditioner compressor and its electromagnetic clutch are working, and goes out when cooling is stopped. Low-pressure fault indicator light (LP), when the refrigerant pressure in the pipeline is too low (such as a serious leakage), the light will turn on. At the same time, the compressor will stop working under the action of the pressure control switch. High pressure fault indicator light (HP): When the refrigerant pressure in the pipeline is too high (such as the pipeline is blocked and the condenser fan motor does not work). ), the light turns on. At the same time, the compressor stops working under the action of the pressure control switch.