Compared with professional repair factory, as general users, we have limited tools and time, so we can only check through some conventional methods. Next, we will introduce several simple but effective air conditioning systems for you. Troubleshooting methods.
Condensate usage can be checked through glass sight glass and low pressure line
First of all, check whether the refrigerant of the fire truck is sufficient, which is what we usually call “fluorine deficiency”. You can check the usage of the refrigerant through the glass observation hole on the liquid storage dryer in the engine compartment. A large number of air bubbles are produced in the observation hole, indicating that the refrigerant is insufficient. There is also a simpler method, which is to touch the low-pressure pipe (the metal pipe marked with “L”) by hand. If it feels cool to the touch and If there is condensation, it can be basically determined that this part of the system is operating normally. If the air conditioning system feels almost the same as the ambient temperature after starting the air conditioning system for a period of time, it is very likely that there is a lack of fluorine.
While checking the above two items, we can also visually check whether there is any leakage of the refrigerant. Since the oil and refrigerant in the compressor of the fire truck are mixed together and transmitted in the entire air conditioning system, when the refrigerant is When a leak occurs, part of the oil will inevitably be taken out together, leaving oil traces at the leak. Therefore, we only need to check whether there are oil traces at the hoses and joints to determine whether the refrigerant leaks. If oil is found Traces should be dealt with as soon as possible.
Next, let’s take a look at the power transmission part of the compressor of the fire truck. The electromagnetic clutch of the air conditioner compressor is composed of a pressure plate, a pulley and an electromagnetic coil. When the power is turned on (press the A/C button in the car) ), a current flows through the coil of the electromagnetic clutch, the magnetized iron core generates suction, the iron is adsorbed on the end face of the belt pulley, and the compressor shaft is driven to rotate by the spring plate combined with the disk, so that the entire air conditioning system runs. When we turn off the air conditioner When the system is turned off, the power supply is cut off, the current in the electromagnetic clutch coil disappears, the suction force of the iron core is also lost, the iron is returned under the action of the spring plate, and the compressor stops working. At this time, the compressor pulley is only driven by the engine and idling. Therefore, when we start the air conditioner and find that the electromagnetic clutch of the compressor is not working properly (not rotating), it proves that the component has failed, which is also one of the main reasons why the air conditioning system of the fire truck cannot operate normally. When the fault is found, we should repair the part in time.
As a part of the air-conditioning transmission system, the compressor belt of the fire truck also needs to be regularly checked for its tightness and use status. If the side in contact with the belt is found to be shiny, it means that the belt is likely to have slipped. Press hard on the inside of it, if there is a 12-15mm bending degree, it is normal, if the belt is shiny and the bending degree exceeds the specified value, the ideal cooling effect cannot be achieved, and the part should be replaced in time.
Finally, let’s take a look at the condenser, which is also easily overlooked. The condenser is generally located at the front end of the fire truck. It uses the air blowing from the front of the car to cool the refrigerant in the pipeline. The mechanism of this component is The high-temperature and high-pressure liquid refrigerant from the compressor passes through the condenser and becomes a medium-temperature and medium-pressure state. The refrigerant passing through the condenser itself is a very effective cooling process. If the condenser fails, it may lead to an imbalance in the pipeline pressure. The system fails. The structure of the condenser is similar to that of a radiator. This structure is designed to increase the contact area and allow the air-conditioning refrigerant to achieve maximum heat exchange in the smallest possible location.
Therefore, regular cleaning of the condenser is also very necessary for the overall effect of the air conditioning and refrigeration of the fire truck. We can visually observe whether there are bent warps or foreign objects on the front of the condenser. To remove foreign objects. In addition, if there are oil traces on the condenser, it is very likely that a leak has occurred, but as long as the car is not crashed during normal driving, the condenser will basically not have serious failures.
Post time: Sep-06-2022