A highly advanced pressure sizer for air conditioning and refrigeration systems. All operating suction, discharge, and standing pressures fluctuate based on ambient temperature.
Dynamic Ambient-Compensated Pressure Calculator
Select a refrigerant and slide the outdoor temperature to calculate target pressures for diagnostics.
35°C
Boiling Point (1 atm)
-51.7°C
Target Suction (Low Side)
108 - 132 psig
Target Discharge (High Side)
342 - 418 psig
Standing Pressure (Off)
~250 psig
Standard Operating Pressures (At 35°C Ambient Outdoor Temp)
| Refrigerant | Suction (Low Side) Pressure | Discharge (High Side) Pressure | Standing Pressure (Off) |
|---|---|---|---|
| R-32 | 108 - 132 psig | 342 - 418 psig | ~250 psig |
| R-410A | 108 - 132 psig | 347 - 424 psig | ~260 psig |
| R-22 | 61 - 75 psig | 234 - 286 psig | ~155 psig |
| R-134a | 32 - 39 psig | 162 - 198 psig | ~95 psig |
| R-290 | 59 - 72 psig | 198 - 242 psig | ~140 psig |
| R-404A | 77 - 94 psig | 266 - 325 psig | ~185 psig |
| R-407C | 72 - 88 psig | 261 - 319 psig | ~175 psig |
| R-600a | 11 - 13 psig | 99 - 121 psig | ~45 psig |
Important Gas Charging Guidelines:
- Always pull a vacuum of under 500 microns before charging to remove non-condensables.
- Charge R410A and R404A blends as liquid only to prevent blend fractionation.
- Standby or standing pressures should never be used as a primary guide for charge sufficiency.