How to get around dredge nozzle limits2/20/2024 ![]() ![]() ![]() An automatic pump down system ( Pump down system) is recommended before any off cycle (especially if the evaporator may get warmer than the suction gas line or the compressor), as long as the pressures are within the application limits.Suction-blast machines are the most common blast cabinets in use, and Guyson’s Tech Support team regularly answers questions about how to get the maximum performance from suction-blast guns.Install a solenoid valve in the liquid line.Avoid refrigerant migration (from the high pressure side to the low pressure side or into the compressor) during long shut-off periods!.Bubbles can destroy the nozzle of the expansion valve due to cavitation forces and reduce the refrigerating capacity. Bubble-free liquid at the expansion valve inlet.Ensure a stable operation mode under all operating and load conditions (also part load, summer/winter operation, minimum speed during operation with frequency inverter).Some thermostatic expansion valves also offer a MOP function. Set the MOP value to the maximum allowable evaporating pressure according to the saturated temperatures of the compressor application limits. ![]() When using electronic expansion devices, enabling the MOP (maximum operating pressure) feature is strongly recommended to avoid overloading the compressor.A low suction gas superheat may cause liquid slugging and compressor bearing washout.A high suction gas superheat setting of the expansion valve may result in high discharge gas temperatures, reduced refrigerating capacity and poor oil return.Provide sufficient suction gas superheat according to the Bitzer Software and its application remarks.If possible, insulate the sensor to ensure it measures the suction gas line temperature and not the ambient temperature.When using an internal heat exchanger, position the evaporator's expansion valve sensor prior the internal heat exchanger.Position the temperature sensor correctly at the suction gas line and fix it.Function of the expansion valve – observe the manufacturer's notes!. ![]() This applies especially to damage resulting from lack of lubrication:
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