Thetruck-mounted cranehas an extensive range of applications. As the seasons change and the temperature rises, the frequency of using the in-car air conditioner is steadily increasing. Its usage significantly enhances the driver’s comfort. So, what issues should be taken into consideration when using the air conditioner of special vehicles?
First of all, turning on the air conditioner immediately upon getting into the car is incorrect. For vehicles that have been exposed to the sun, the windows should be opened first to expel the dirty air inside the car. Then, turn on the external circulation to further remove the contaminated air within the vehicle. Finally, switch on the air conditioner, which will result in much better air quality. Nowadays, many vehicles are equipped with automatic air conditioners. Generally, internal circulation is used for about 20 minutes, and then it is automatically switched to external circulation for 2 minutes. This can prevent dirty air from harming our bodies.
Let’s explore this in more detail. When a vehicle is parked in the sun for an extended period, the interior temperature can rise significantly. Opening the windows allows the hot air to escape and helps to reduce the initial temperature. By then turning on the external circulation, fresh air from outside is drawn into the vehicle, further diluting any remaining stale or polluted air. Only after these steps are taken should the air conditioner be turned on. This sequence not only provides better air quality but also reduces the strain on the air conditioning system. Automatic air conditioners are designed to optimize the air circulation process. The initial use of internal circulation helps to quickly cool down the interior by recirculating the cooled air. However, prolonged use of internal circulation can lead to a buildup of carbon dioxide and other pollutants. Switching to external circulation periodically allows fresh air to enter, improving the air quality inside the vehicle and reducing the risk of drowsiness or discomfort for the driver.
When the air conditioner of thetruck-mounted craneis turned on, the refrigeration system begins to operate. However, while the refrigeration system is producing cold air, it will cause the air engine pipeline to become damp. Coupled with the fact that the engine compartment is originally very sultry, a large amount of bacteria can grow. After a long time, there will be peculiar odors. Therefore, drivers oftruck-mounted cranes should turn off the air conditioner in advance when the vehicle’s work is about to end. In this way, natural wind can flow through the engine pipeline, and the pipeline will dry quickly, making it less likely for bacteria to breed.
The growth of bacteria in the air conditioning system is a common problem. The moisture created by the refrigeration process provides an ideal environment for bacteria and fungi to thrive. These microorganisms can cause unpleasant odors and potentially pose health risks. By turning off the air conditioner early and allowing natural air to circulate, the moisture in the pipeline can evaporate, reducing the likelihood of bacterial growth. Additionally, regular maintenance of the air conditioning system, such as cleaning or replacing the air filter, can also help prevent the buildup of bacteria and improve the air quality inside the vehicle.
Like other vehicle accessories, the on-board air conditioner will also malfunction. Let’s examine what malfunctions may occur in thetruck-mounted craneair conditioner.
Malfunction 1:Refrigerant leakage will cause the air conditioner to be unable to cool, and the air conditioner will also have the fault of evaporator icing. The manifestation is that initially, the cooling effect is good, but after a period of time, it deteriorates until there is no cooling effect. After being turned off for a while, it returns to normal.
Cause of malfunction: Generally, the faults that cause evaporator icing are poor working conditions of the expansion valve and a lack of refrigerant. However, the most common cause is a malfunctioning temperature control switch. The temperature control switch is responsible for monitoring the temperature of the evaporator. If the temperature is too low, it will control the compressor to stop. After the temperature rises, it will continue to turn on the compressor to work. Repeatedly, if it loses its function, it will cause the compressor to run continuously. The excessive cooling capacity will cause the surface of the evaporator to freeze and affect the passage of air, resulting in a continuous decline in cooling capacity.
Let’s analyze this malfunction further. Refrigerant leakage is a serious problem that can significantly affect the performance of the air conditioning system. When refrigerant leaks, the pressure in the system drops, reducing the cooling capacity. Evaporator icing occurs when the temperature of the evaporator drops too low. This can be caused by a variety of factors, including a malfunctioning expansion valve or a lack of refrigerant. The expansion valve controls the flow of refrigerant into the evaporator. If it is not working properly, it can cause the refrigerant to flow too quickly or too slowly, resulting in improper cooling. A lack of refrigerant can also lead to evaporator icing as the system tries to compensate for the reduced cooling capacity by running the compressor continuously. The temperature control switch plays a crucial role in preventing evaporator icing. If it malfunctions, the compressor may continue to run even when the evaporator temperature is too low, causing the surface to freeze. This not only reduces the cooling capacity but can also damage the air conditioning system over time.
Malfunction 2:When the compressor is working, the cooling effect is very good, but it trips off after working for a few seconds and then starts working again. Especially when it is hot at noon, it feels that the temperature in the cab is very high and it always trips off repeatedly.
Cause of malfunction: This situation may be due to too much refrigerant charged in the air conditioner, which causes the system pressure to easily become high. The pressure switch activates overpressure protection. At this time, the compressor will stop working until the pressure drops to the protection pressure and then engages again to work. Repeatedly, one can release some refrigerant and then measure the pipeline pressure.
This malfunction is often caused by an improper amount of refrigerant in the system. Too much refrigerant can lead to excessive pressure, triggering the pressure switch to shut off the compressor to protect the system. As the pressure drops, the compressor may start working again, resulting in a cycle of on and off. This not only affects the cooling performance but can also put additional strain on the compressor and other components of the air conditioning system. Correctly charging the system with the appropriate amount of refrigerant is essential for proper operation.
The above knowledge abouttruck-mounted craneair conditioners is also applicable to other special vehicles, such as concrete mixers, powder material transport vehicles, wrecker trucks, and so on.
In conclusion, understanding how to use and maintain the air conditioner of atruck-mounted craneis crucial for ensuring driver comfort and the proper functioning of the vehicle. By following the correct usage procedures and being aware of common malfunctions and their causes, drivers can take appropriate measures to keep the air conditioning system in good condition. This knowledge can also be applied to other special vehicles, helping to improve the overall performance and reliability of these important pieces of equipment.
