Reasons for Low Intake Pressure

[DeHazel]

Reasons for low intake pressure may include blockages in the refrigerant system's liquid supply pipe, expansion valve, or filter, insufficient refrigerant charge in the system, excessively long evaporator pipelines, etc. Blockages: Blockages in the refrigerant system's liquid supply pipe, expansion valve, or filter, or insufficient opening, malfunctioning float valve, low ammonia liquid circulation in the system, insufficient height difference or small pipe diameter in the intermediate cooler's liquid supply, can all lead to excessively low compressor suction pressure. Insufficient Refrigerant Charge: Insufficient refrigerant charge or liquid supply in the system, or improper adjustment of the throttle valve, can result in low compressor suction pressure. Excessively Long Evaporator Pipelines: If the evaporator pipelines are too long or if the design of the parallel suction header for multiple compressors is improper, it can also cause low compressor suction pressure. Excessive Oil Content in Freon System: Excessive oil content in Freon systems, which easily dissolves oil, can lower the suction pressure. Thick Frost or Oil Buildup in Evaporator: Thick frost or oil buildup on the inner walls of the warehouse evaporator increases thermal resistance, leading to reduced suction pressure.