🧊 1. R22 Refrigerant (Common in old systems)
Mode Pressure (psi) Remarks
Suction (Low side) 65 – 75 psi Normal cooling condition
Discharge (High side) 220 – 260 psi Depends on outdoor temp (40–45°C)
Standing Pressure (System off) 130 – 150 psi Equalized both sides
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🌀 2. R410A Refrigerant (Modern systems)
Mode Pressure (psi) Remarks
Suction (Low side) 115 – 130 psi Normal cooling condition
Discharge (High side) 380 – 450 psi Higher because R410A runs at high pressure
Standing Pressure (System off) 220 – 250 psi Equalized both sides
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🌡️ 3. R407C Refrigerant
Mode Pressure (psi) Remarks
Suction (Low side) 65 – 75 psi Similar to R22
Discharge (High side) 230 – 260 psi Ambient 40–45°C
Standing Pressure (System off) 130 – 160 psi Equalized
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❄️ 4. R134a (Used in small chillers / fridges)
Mode Pressure (psi) Remarks
Suction (Low side) 25 – 35 psi Cooling load condition
Discharge (High side) 150 – 180 psi Depends on ambient
Standing Pressure (Sys
tem off) 90 – 110 psi Equalized both sides
This article provides a comprehensive overview of refrigerant pressures for various HVAC systems. Understanding these pressure ranges is crucial for diagnosing and maintaining air conditioning systems. For residents in Alpharetta, GA, seeking professional assistance, HVAC repair in Alpharetta GA is readily available. Regular maintenance and timely repairs can ensure optimal performance and longevity of your HVAC system.
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