Recently, Chongqing Changhui Automotive Parts Co., Ltd. released the "Winter Refrigeration Unit Operation and Maintenance Guide", providing comprehensive and practical guidance for the stable operation of the company's refrigeration units in the cold winter season, aiming to ensure the quality of goods, reduce the frequency of unit failures, and ensure efficient operation of refrigeration transportation in low-temperature environments.

With the arrival of winter, the sudden drop in temperature has brought many challenges to the operation of refrigeration units. On the one hand, accurate temperature control is needed to maintain the quality of the goods and avoid damage due to temperature fluctuations; On the other hand, it is necessary to prevent unit failures that may be caused by low temperatures and ensure the normal operation of the unit. Chongqing Changhui Automotive Parts Co., Ltd., as a leader in the industry, deeply recognizes the importance of winter refrigeration unit operation and maintenance. Therefore, we have compiled and released this operation and maintenance guide.

This operation and maintenance guide elaborates on the key points of daily maintenance for winter refrigeration units, emphasizing that doing a good job in daily inspection and maintenance can significantly reduce the probability of failure. Compass has provided targeted troubleshooting suggestions for both non independent and independent units.

Condenser/evaporator: It is necessary to regularly blow high-pressure air from the inside out to clean the fins, remove willow catkins, dust, frost, and debris, and prevent blockages from affecting ventilation and heat transfer efficiency.

At the same time, check whether the fins are deformed or damaged. Minor deformations can be manually corrected, while severe damage requires timely replacement. After rain and snow, it is necessary to promptly check the water accumulation at the bottom of the evaporator to ensure smooth drainage.

Fan: Before starting the condenser fan on snowy days, be sure to clean the ice and snow on it, and manually rotate the fan blades to check for any jamming.

If the fan gets stuck and forcibly starts, it is easy to burn out the motor.

Refrigerant and lubricating oil: Before winter, professional technicians should be consulted for preventive maintenance, checking the pressure and filling amount of refrigerant, as well as the condition of compressor lubricating oil.

Wiring and connectors: Focus on checking the defrosting sensor, drainage pipe heating wire and other heating lines to see if there is any looseness or aging, ensure that the pipelines are firmly fixed, avoid being too close to the high-temperature exhaust pipe, and isolate them properly.

Independent Unit: Additional Attention to Power System

The independent unit comes with its own engine. In addition to the inspection items for non independent units mentioned above, the following core components should also be given special attention:

Engine system: The coolant should be selected from a reputable brand, and the freezing point should be at least 10 ℃ lower than the local low temperature to prevent pipeline freezing and cracking.

Replace the original engine oil to ensure smooth start-up and extend the lifespan of the unit.

Check the preheating plug circuit to avoid difficulty starting in cold weather.

Belt and bearings: The tightness of the belt should meet the standard, and check for cracks and forks. The belt is prone to hardening and slipping in low temperature weather, and original accessories should be used.

Check for any abnormal noise in the bearings, replace them promptly if they are damaged, and regularly lubricate the fan shaft.

Fuel and battery: Replace with low-grade diesel such as -10 # and -20 #, regularly drain and clean the fuel pump to prevent wax from blocking the oil circuit.

Check the battery level and tighten the pile head. The battery life may decrease at low temperatures. If not in use for a long time, disconnect the main switch or charge regularly.

Idle maintenance: If the unit is not used for a long time, it is recommended to start it every half month and run it for half an hour. This can not only recharge the battery, but also fully lubricate the machinery to avoid leakage problems.

Usage tips: Accurate temperature control+scientific operation

Proper daily maintenance is the foundation, and the correct usage method can better ensure the security of goods and the stability of the unit. The operation and maintenance guide proposes a series of practical small details:

Ventilation and pre cooling/preheating: Before loading, clean the carriage thoroughly to keep the interior dry, and then pre cool or preheat according to the characteristics of the goods.

At the same time, check the sealing of the carriage to avoid air leakage affecting the insulation effect.

If the fresh goods are above 0 ℃, the heating mode can be turned on to preheat the cargo box when loading in cold weather, to avoid damage to the goods.

Reasonable temperature setting: Strictly set the temperature according to the requirements of the goods, and do not blindly lower the temperature to avoid damaging the fresh goods.

For goods that need to be frozen at -18 ℃, pay more attention to the actual temperature inside the compartment to prevent the goods from freezing and deteriorating due to low external temperatures.

Defrosting and operation: In winter, there is a large temperature difference between the inside and outside of the cabin, and the evaporator is prone to frosting. It is necessary to ensure that the automatic and manual defrosting functions are normal, while also ensuring smooth drainage of condensed water.

When loading and unloading goods, try to shorten the opening time of the car doors as much as possible. It is recommended to use door curtains to reduce heat and cold exchange, and allow the unit to continue stable operation after loading is completed.

Adverse weather response: In extremely cold weather, the vehicle engine idles for a long time to drive the refrigeration unit, which can easily cause problems such as carbon deposition and low coolant temperature. It is important to pay more attention to the engine operating status.

When transporting goods that are afraid of freezing, even if the external temperature is low, the heating function of the unit (if any) or additional insulation measures can be used to ensure that the goods are not frozen. When the temperature is too low, the front end of the condenser can be appropriately covered, which can not only assist in heating up, but also avoid the low water temperature of the independent engine.

The winter refrigeration unit operation and maintenance guide released by Chongqing Changhui Automotive Parts Co., Ltd. focuses on balancing "cargo protection" and "machine protection". The relevant person in charge of the company stated that following the maintenance points and usage techniques in the guidelines can not only reduce the frequency of unit failures, but also firmly maintain the quality of goods.

In the future, the company will continue to pay attention to industry trends and customer needs, continuously improve operation and maintenance services, provide customers with better and more efficient refrigerated transportation solutions, calmly cope with low temperature challenges, and ensure smooth and secure transportation in the cold winter.