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As a frequent fault in industrial refrigeration and cold storage systems, high discharge pressure directly reduces refrigeration efficiency and raises power consumption, and may even trigger high-pressure protection shutdown in severe cases.
Under standard working conditions, normal discharge pressure of refrigeration compressor units stays at 1.2–1.5MPa. Continuous pressure over 1.8MPa will trigger protection shutdown. Main causes include poor condenser heat dissipation, excessive refrigerant charge, non-condensable gases in the system, and blocked throttling devices. Long-term high-pressure operation accelerates compressor component wear and increases overheating risks.
First, inspect fin surface dust accumulation, cooling fan operation status, and cooling water flow for water-cooled models. Poor heat dissipation is the most common cause of high discharge pressure.
Check refrigerant level via sight glass and pressure parameters to confirm whether overcharge occurs.
After the unit shuts down and stands still for 2–4 hours, compare static pressure with saturation pressure corresponding to ambient temperature to judge whether non-condensable gases exist.
Check throttling devices and filter driers for blockage, which may cause abnormal high-pressure on the condenser side.
Adopt corresponding solutions based on fault causes:
After proper troubleshooting, discharge pressure can return to the normal range, cutting unit power consumption by 10%–12%.
Regular inspection of condenser status and system pressure parameters effectively reduces high discharge pressure faults. Building a standardized preventative maintenance plan helps maintain long-term stable operation of cold storage refrigeration systems.
As a frequent fault in industrial refrigeration and cold storage systems, high discharge pressure directly reduces refrigeration efficiency and raises power consumption, and may even trigger high-pressure protection shutdown in severe cases.
Under standard working conditions, normal discharge pressure of refrigeration compressor units stays at 1.2–1.5MPa. Continuous pressure over 1.8MPa will trigger protection shutdown. Main causes include poor condenser heat dissipation, excessive refrigerant charge, non-condensable gases in the system, and blocked throttling devices. Long-term high-pressure operation accelerates compressor component wear and increases overheating risks.
First, inspect fin surface dust accumulation, cooling fan operation status, and cooling water flow for water-cooled models. Poor heat dissipation is the most common cause of high discharge pressure.
Check refrigerant level via sight glass and pressure parameters to confirm whether overcharge occurs.
After the unit shuts down and stands still for 2–4 hours, compare static pressure with saturation pressure corresponding to ambient temperature to judge whether non-condensable gases exist.
Check throttling devices and filter driers for blockage, which may cause abnormal high-pressure on the condenser side.
Adopt corresponding solutions based on fault causes:
After proper troubleshooting, discharge pressure can return to the normal range, cutting unit power consumption by 10%–12%.
Regular inspection of condenser status and system pressure parameters effectively reduces high discharge pressure faults. Building a standardized preventative maintenance plan helps maintain long-term stable operation of cold storage refrigeration systems.
