2, the refrigerant pipeline no or lack of oil return bend. Transport refrigerant pipeline in the lateral turn upward bend, must be made into a first sagging upward after the small bend that is U-bend, so that the pipeline and then upward to qualify, can not be made directly into a 90-degree turn upward, otherwise, the system inside the oil can not be very good to go back to the compressor, and a large number of deposits in the chiller, so that the fan and the entire system can not function properly, and even damage to the fan and the set of equipment.
3, refrigerant piping connection is not balanced. Unit piping connected to a group of multiple compressors, to make the return oil balanced distribution to the compressor, the main pipeline interface must be set in the middle of the head located in more than one, and then set up a number of branch pipelines to both sides, so that the return oil balanced flow into a number of compressor branch pipe. Moreover, each branch pipe should be equipped with a valve to adjust the return oil volume.
4, the pipeline did not do insulation. If there is no insulation material, the cold pipeline will be in the ambient temperature frost, thus affecting the cooling effect, so that the unit load increases, and then make the unit super-intensive operation, reducing the unit life.
5, to regularly check the technical indicators, timely adjustment. The system's operating temperature and pressure levels, the amount of lubricant and refrigerant, should be checked and adjusted in a timely manner. The system should have automatic control and compressor alarm device, once there is a problem, it will issue an alarm prompt, or automatic protective shutdown, compressor shutdown.
6, the maintenance of the unit. To regularly replace the lubricating oil, filter. Refrigerant replenishment as needed. Condenser should be cleaned at any time, keep clean, so as not to have dust, sand or flotsam debris, affecting the cooling effect. Lubricating oil in the system under high temperature operation for a long time, its performance may have changed, can not play a proper lubrication and other functions. Filters should also be replaced regularly. We know that the general machine have "three filters", should also be replaced regularly.
7, chiller installation environment and maintenance issues. The location of the chiller inside the cold storage and the environment, will affect its operation. Generally near the cold storage door near the chiller, easy to dew frost. Although the chiller can be automatically heated and defrosted at regular intervals, if the door is opened too frequently, the start-up time is too long, and the hot airflow enters for a long time and in large quantities, the fan defrosting effect will not be good. Because the defrost time of the chiller can not be too long, otherwise the refrigeration time is relatively shortened, the cooling effect is not good, the library temperature can not be guaranteed. Source refrigeration encyclopedia
8, chiller defrosting melted down the water drainage problem. This problem is related to the degree of frost. As the fan frost is serious, it is bound to produce a lot of condensation, fan water plate can not withstand, poor drainage, it will leak down to the library floor, if there are stored goods below, it will soak the goods. In this case, you can install a thicker conduit to eliminate condensation.
Some chillers have a problem with water blowing out of the fan and spraying onto the stored goods. This is also the hot and cold exchange environment of the fan frost problem, mainly fan fan page in the hot environment of condensation, rather than the fan itself defrost effect is good or bad.
9, condenser fan motor and cold air machine electric heating tube problem. This is a wearable part. Fan motors that run for a long time in a high-temperature environment will likely fail and be damaged. If the cold storage to ensure that the temperature is very important, it is necessary to order a number of perishable parts in order to facilitate timely maintenance purposes.
10, cold storage temperature and cold storage door. A cold storage room, how large the area, how much stock, how many doors open, the door open and close the time and frequency of stock in and out of the frequency, cargo throughput, are factors that affect the temperature of the library.