Some customers in the screw chiller operation and use process, and manufacturers formulate discrepancies, resulting in unit repair rate increased. Xiao Bian believes that the screw chiller operation is also a rule, just as we drive the car stalls from 1 to 5 step by step, if the leapfrog gear is likely to cause gear box damage. Screw cold water machine in operation in the erroneous zone: before the switch off the shell and tube condenser inlet valve, this will cause water channeling phenomenon. Part of the cooling water flow away from the shell and tube condenser, which reduces the flow of cooling water pipe shell type condenser, causing condenser pressure rising, the host running current increases, lead to a decrease in the refrigeration quantity, serious will also cause the screw chillers stop working. In this way, the utility model not only costs electricity, reduces the refrigerating efficiency, but also increases the equipment failure rate.
Starting from the above error operation, the cooling water, outlet water temperature and condensation pressure of the main engine are raised. The unit will alert, will cause the wrong judgment to the operator, so the thought of cooling water is not enough, the water inlet valve and the condenser cooling water pump outlet valve open, there will be a cooling tower fan is opened, it will cause the cooling tower fan, water pump and power consumption increase, the cost will increase the number of. From childhood, some operators even turned on the cooling water pump. To open the cooling water pump can reduce the condensing pressure and temperature of cooling water, so the pump power is wasted. Xiao Bian thinks that the correct method of operation of the cooling water system of the unit is:
A, before starting off shell and tube condenser inlet valve, prevent channeling water unit.
B, open the inlet and outlet valves and cooling water pumps on the shell and tube condensers, adjust the inlet and outlet pressure values of the condenser
C, if the shell and tube condenser water pressure gauge pointer swings too large, it shows that the cooling water system has air, then you need to empty the gas in the unit, until the pressure gauge indicates the normal rear.
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