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Comparison Table of 5 Major Fault Symptoms Caused by Refrigerant Shortage (Lack of Fluorine) (Directly Usable for Maintenance)
I. Slight Refrigerant Shortage
Suction Temperature: On the high side with high superheat
Discharge Temperature: Significantly high
High Pressure: Slightly low
Low Pressure: Low
Frosting Condition: No frost on the rear half of the evaporator, no frost on the suction return pipe
Symptom Summary: Poor refrigeration effect, insufficient cold air, no icing on pipelines
II. Severe Refrigerant Shortage (The case you asked about)
Suction Temperature: On the contrary, low
Discharge Temperature: Drops from high to low
High Pressure: Very low
Low Pressure: Sharp drop
Frosting Condition: Frost forms at the front end of the evaporator and melts at the rear half, the suction return pipe turns cold and even condensates
Principle: Pressure collapse → Sharp drop of saturated evaporation temperature → Suction temperature pulled down
III. Insufficient Refrigerant + Small Throttling
Suction Temperature: Extremely high
Discharge Temperature: Extremely high and prone to overheating protection
High and Low Pressure: Both low
Frosting: Only a little frost at the evaporator inlet
IV. Slow Refrigerant Leak with Chronic Fluorine Shortage
Suction Temperature: Rises gradually
Discharge Temperature: Turns hot slowly
Low Pressure: Drops slowly month by month
Performance: Works well right after startup, becomes less and less cold during operation
V. Extreme Refrigerant Shortage (Almost exhausted)
Suction Temperature: Very low, even close to the lower limit of ambient temperature
Discharge Temperature: Not hot instead
Low Pressure: Close to negative pressure
Risk: Compressor dry friction due to oil shortage, burnout and shaft seizure
Mnemonic Formula
Slight shortage brings high return air temperature; severe shortage makes pressure plummet;
Saturated temperature falls accordingly, suction air turns cool unexpectedly;
Both high and low pressure run low, half-evaporator frosting is easy to observe.
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