What should I do if there is oil leakage during the operation of a 3 ton chiller?

What should I do if there is oil leakage during the operation of a 3 ton chiller?

What is an LC -25°C ~ -5°C 저온 냉각기 running oil? That is to say, when the cooling water temperature is low, the exhaust temperature is not high, the oil and refrigerant cannot be separated properly in the oil separator, the mixture enters the heat exchanger, the unit low pressure is low, the expansion valve is blocked, and the unit cannot start. Generally speaking, the occurrence of oil leakage is mainly due to operational errors, and it is important to pay attention to the operation. Low oil temperature, excessive refueling, etc. can also cause this situation.

If oil leakage occurs in industrial chillers, it is necessary to promptly handle it. Otherwise, the more lubricating oil accumulates in the system, the more vicious cycles there will be, the higher the operating cost, and the lower the operational reliability.

1. Oil leakage fault phenomenon.

No traces of oil can be seen in the oil separator. Currently, oil does not accumulate in the condenser, but enters the evaporator through an expansion valve. The oil adheres to the heat exchange copper pipe of the evaporator, resulting in poor evaporation efficiency and low pressure inside the evaporator. At the same time, the suction superheat of the compressor is low, and the refrigerant liquid is directly sucked in. The discharge temperature of the compressor is low, and the oil and refrigerant cannot be separated yet, This vicious cycle causes all the oil to accumulate in the evaporator.

No traces of oil can be seen in the oil separator. All the oil comes into the condenser with the exhaust gas. When the water temperature continues to decrease, all the oil collects into the condenser. The expansion valve blocks the oil, and the liquid supply in the evaporator is insufficient. The pressure begins to decrease until the low pressure alarm stops.

2. Solution to oil leakage.

When the oil level inside the oil separator drops, immediately switch the unit to manual control mode to limit the load of the compressor, such as limiting the energy to over 50%. Increase the condensation pressure. Reduce the low voltage alarm value and low voltage shutdown value of the unit to the allowable range, and try to ensure that the unit is in operation as much as possible.

At this point, if the oil level is still very low and the pressure inside the evaporator is also very low, it is necessary to consider whether the oil enters the evaporator. At this time, it can be seen from the sight glass of the evaporator whether there is a large amount of white foam. If there is, it means that the oil is in the evaporator, and on the contrary, it may be in the condenser.

At this point, pay close attention to the temperature of the chilled water. You can first reduce the flow rate appropriately to reduce the outlet temperature, and then quickly increase the flow rate to quickly increase the outlet temperature of the evaporator. At this point, the water temperature will exceed the saturation of the refrigerant.

If the temperature is too high, the refrigerant will boil violently, and the refrigerant oil will be sucked into the compressor with the rolling refrigerant foam. At this point, the exhaust temperature should slightly decrease. But it should also be much higher than the separation temperature of oil and refrigerant, and the oil should be brought back to the oil separator and separated.