What is the normal pressure for an automotive Freon gauge?
1 Answers
For automotive air conditioning refrigerant pressure gauges, simply observe whether the kilogram reading is excessive. The outer red ring ranging from -30 to 350 LB/IN2 represents imperial pressure units, while the inner scale from -0.1 to 2.5 MPa indicates metric pressure units. When not pressurized, the gauge needle should rest at the 0 position. During normal air conditioning operation, the needle should point to approximately 0.5 MPa. 0.1 MPa is roughly equivalent to 1.0197 kg/cm² = 0.987 atm. The standard operating pressure for air conditioning systems is 5.0985 kg/cm². Below are additional relevant details: Precautions for automotive air conditioning refrigerant charging: 1. Before vacuuming, completely replace any non-compatible refrigerant types to ensure proper performance. 2. When replacing components like compressors, high/low pressure pipes, or receiver-driers, always seal pipe openings. 3. Conduct leak tests before refrigerant charging, replace sealing rings whenever possible, check compressor oil levels, and replenish if necessary. 4. Adhere to specified refrigerant quantities within the designated +/- tolerance range - neither excessive nor insufficient. 5. Be mindful of refrigerant type differences, particularly between R12 (Freon) and R134A (environmentally friendly refrigerant).
