Common failures and corresponding solutions when the chiller is in use
In industrial fields such as medicine, chillers play a key role. With the continuous development of the pharmaceutical industry, the chiller market also has good room for development. Data show that the market capacity of my country's chiller is increasing at an annual rate of 8%, and the market share of domestic chillers is increasing year by year, and the process of import substitution is expected to accelerate.
At the same time, chillers are also facing new requirements in terms of quality and stability. It is understood that the current chiller industry in my country is developing towards intelligence, energy saving, humanization and unit integration. Related chiller manufacturers are also constantly exploring and improving, updating equipment and technology, and helping the pharmaceutical and other industries to develop better. .
The author also understands that in the process of using the chiller equipment, it is inevitable that they will encounter some common failures. Users need to understand the possible causes of the failures and make corresponding solutions in time to make the production operation more stable. So, what are the common failures of chillers?
1.Small temperature difference between inlet and outlet water
When the user encounters a small temperature difference between the inlet and outlet of the water chiller, the general reasons are as follows.
One, the output cooling capacity of the chiller is small, for example, the unit itself is faulty or not fully loaded. The industry suggests that under these conditions, users can make preliminary judgments by observing the operating current of the chiller.
Secondly, the heat transfer effect of the equipment is not good. For example, the heat transfer tube has serious fouling, which affects the heat transfer of the chiller. The user can judge by observing the heat transfer temperature difference between the water temperature and the evaporation temperature.
Third, the water flow is too large, and the user can judge by observing the pressure difference between the inlet and outlet water of the evaporator and the running current of the water pump. In addition, if the above problems are eliminated, the user can check whether the sensor or thermometer is accurate.
2.Communication failure
It is understood that the computer controller controls each module through the communication line and the main interface board. The main cause of communication failure is the poor contact or open circuit of the communication line, especially the interface is damp and oxidized to cause poor contact. In addition. Failure of the unit electronic board or the total interface board, improper selection of the address dial switch, and power failure can cause communication failures.
3.High voltage failure
When the compressor discharge pressure is too high, it is easy to cause the high-pressure protection relay to operate. If the pressure is too high for a long time, it will cause the compressor operating current to be too large, the motor is easy to burn, and it is easy to cause damage to the compressor exhaust valve.
So, under what circumstances will a high voltage fault occur? Mainly include: high cooling water temperature, poor condensing effect; insufficient cooling water flow, unable to reach rated water flow; condenser scaling or clogging; excessive refrigerant charge; refrigerant mixed with non-condensable gases such as air and nitrogen ; False alarms caused by electrical faults.
4.low voltage failure
When the compressor suction pressure is too low, it will cause the low-pressure protection relay to act. It is understood that the reasons for the low-pressure failure are: insufficient refrigerant or leakage; insufficient refrigerant water flow; blockage of the evaporator and poor heat exchange; false alarms caused by electrical faults; low outside temperature.
In addition to the above failure causes, users usually need to pay attention to the maintenance and maintenance of the equipment after using the chiller in order to ensure the extended life of the equipment and stable operation.
