The chillers designed for cold storage, are adopting different types of compressors for different capacity cold storages.Cold storage compressors can be devided into screw compressors, positive displacement cold storage compressors, fixed displacement cold storage compressors and variable displacement cold storage compressors. Here mainly introduces how to maintain the chiller for a cold storage:

1. Startup and preparations

Before starting, check whether the valves of the unit are in the normal starting state and whether the cooling water source is sufficient. After turning on the power, set the temperature as required. The refrigeration system of the cold store is generally automatically controlled, but the first time it is used, the cooling water pump should be turned on, and the compressors should be started one by one after normal operation.

2. Operation management
Pay attention to the following points after the normal operation of the refrigeration system:
Pay attention to the following points after the normal operation of the refrigeration system:
1). Listen to whether there is abnormal sound during the operation of the equipment;
2). See if the temperature in the warehouse drops;
3). Check whether the cooling and heating of the exhaust air is clear, and whether the cooling effect of the condenser is normal.

3. Ventilation and defrosting
Fruits and vegetables will release some gas during storage, and accumulation will deteriorate the collection to a certain extent. Therefore, it is necessary to ventilate and ventilate frequently in the process of use, generally it should be carried out in the morning with lower temperature. In addition, after the cold storage is used for a period of time, the evaporator will form a layer of frost, which will affect the cooling effect if it is not removed in time. When defrosting, cover the storage in the library and clean the accumulated frost with a broom. Be careful not to knock hard.

1)For the evaporator of the air-cooled chiller: always check the defrosting situation. Whether the defrosting is timely and effective will affect the cooling effect and cause the liquid return of the cooling system.

2)Observe the operating state of the compressor frequently and check the exhaust temperature. When changing seasons, pay special attention to the operating status of the system and adjust the system's liquid supply and condensation temperature in a timely manner.

3)Observe the oil level and oil return condition of the compressor and the cleanliness of the oil frequently. If the oil is dirty or the oil level drops, it should be resolved in time to avoid poor lubrication.

4)Listen carefully to the sound of the compressor, cooling tower, water pump or condenser fan, and find any abnormalities in time.  Also check the vibration of the compressor, exhaust pipe.

5)Maintenance of the compressor: The initial cleanliness of the system is poor, and the refrigeration oil and filter drier should be replaced after 30 days of operation.  Replace it after six months of operation (depending on the actual situation).  For systems with high cleanliness, the refrigeration oil and filter drier should be replaced once after six months of operation, depending on the situation.

6)For Air-cooled Chillers: Always clean the fin type condenser to maintain a good heat exchange status.  For Water-cooled Chillers: Always check the turbidity of the cooling water. If the cooling water is too dirty, replace it. Check the water supply system for bubbles, blisters, drops, and leaks. Whether the water pump works normally, whether the valve switch is effective, and whether the cooling tower and fan are normal. For air cooler: Check the condenser for scaling problems and remove scale in time

For more details, welcome to contact us to give you the full instructions at sales@hstars.com.cn  www.hstarschiller.com